GENERAL REQUIREMENTS FOR SELECTION AND TRAINING
SAMPLES FOR CHEMICAL ANALYSIS

GOST 24231-80

Valid from 01.07.80

until 01.07.95

1.2. The method of sampling, the mass of the sample is set in the regulatory and technical documentation for specific products.

1.3. Sampling may be carried out at the manufacturer's plant from liquid metal or alloy by casting ingots, if this is specified in the standards for specific products.

For sampling, a device is used that is resistant to the liquid metal or alloy and does not affect the chemical composition of the ingot. Sampling conditions should ensure compliance chemical composition selected ingots to the average chemical composition of the smelting.

The ingots must be marked with the melt number and the designation of the metal or alloy grade.

1.4. Methods and conditions for sampling point samples

1.4.1. Point samples are taken from each selected workpiece or semi-finished product in equal quantities.

The method of taking point samples is indicated in the table.

Type of blanks and semi-finished products	Sampling method	Appearance samples
Cathodes, anodes, ingots, blocks and flat horizontally cast ingots	Drilling, milling, sawing	Shavings, sawdust
Vertically cast ingots (flat, round and square)	Drilling, sawing, milling, turning	Shavings, sawdust
Plates, sheets, tapes and strips with a thickness of more than 1 mm	Drilling, milling	Shavings, sawdust
Sheets, strips, tapes with a thickness of 1 mm or less	Cutting, punching, milling	small pieces
Bars and profiles	Turning, sawing, milling, drilling, filing	Shavings, sawdust
Pipes with a wall thickness of more than 0.5 mm	Drilling turning, milling
Pipes with a wall thickness of 0.5 mm or less		small pieces
Wire diameter over 3 mm	Turning, sawing, cutting	Shavings, sawdust, small pieces
Wire with a diameter of 3 mm or less		small pieces
	Cutting, stamping	small pieces
Forgings, stampings and plates	Drilling, turning, milling
Granular and lumpy metals	direct selection	small particles

Note. Spot sampling from semi-finished products and blanks with an uneven distribution of components and impurities (for example, from anti-friction alloys) by drilling is not allowed.

When taking incremental samples by milling or turning, the machining speed should be such that there was no tearing out of the softer phase.

1.4.5. The pooled sample should be thoroughly mixed and, if necessary, crushed.

1.5. Spot sampling location

1.5.1. A point sample from the cathodes is taken by drilling through at five points - in the middle and at four points at the corners at a distance of 50 to 100 mm from the edge. The diameter of the drill used should be from 10 to 25 mm.

A point sample can also be taken by milling the inner faces obtained by sawing the anode cathode into four diagonal parts.

By agreement between the manufacturer and the consumer, other methods of taking point samples are allowed.

1.5.2. A point sample from ingots and horizontally cast ingots is taken by drilling, sawing or milling.

Each ingot selected in the sample, or an ingot up to 100 mm thick, is drilled through at five points: in the middle and at four points diagonally - at a distance from 1/5 to 1/6 of the diagonal from the corner.

With a thickness of an ingot or an ingot of more than 100 mm, the workpieces are drilled at six points: three on the upper and lower surfaces, while one drilling is carried out in the middle and two - at a distance from 1/5 to 1/6 of the diagonal from the corners, to a depth equal to half the height of the piece.

The diameter of the drill used should be from 10 to 20 mm.

Each ingot or ingot is sawn or milled in three places: in the middle and at equal distances from the middle - approximately at a distance of 1/4 of the length of the ingot or ingot. Milled yes 1 / 3 thickness.

A point sample from a large ingot (block) is taken by drilling at three points of any side face: one drilling is carried out in the middle of the ingot and two at a distance of 1/6 of the ingot height to a depth of at least 50 mm.

It is allowed to take a sample from the blocks by cutting off two diagonally opposite corners along the entire height of the block.

1.5.3. A point sample from vertically cast ingots (flat, round and square) is taken by drilling, sawing or milling.

From one of the ends of the ingot, a template with a thickness of 20 to 100 mm is cut perpendicular to its longitudinal axis. Sampling by drilling is carried out in the same way as for horizontally cast ingots. From ingots cast in a continuous way, it is allowed to cut off templates with a thickness of at least 10 mm. Drilling in this case is allowed to be carried out at ten points, on both sides of the template (five drillings on each side) to a depth equal to half the thickness.

Drilling of templates from ingots of round section is carried out in the middle, at distances equal to 1/4, 2/4 and 3/4 of the radius.

Vertically cast nickel and cobalt ingots are drilled at three points: one third of the original sample is drilled in the center, another third at a distance of 1/4 of the height and the last third at a distance of 3/4 of the height of the ingot.

Point sampling by sawing ingots is carried out perpendicular to its longitudinal axis, so as to save the workpiece for subsequent technological processing.

Point sampling by milling of vertically cast ingots, except for round ingots, is carried out over the entire section.

For ingots of round cross section from alloys with low segregation, it is allowed to take a point sample by turning the ingot along the generatrix in several places.

(Changed edition, Rev. No. 1, 2).

1.5.4. Point samples from sheets, strips and tapes are taken from a segment covering the entire width of the semi-finished product.

A segment with a thickness of more than 1 mm is drilled through at several points.

It is allowed to select chips by repeated drilling of folded segments. A segment up to 1 mm thick is cut into small pieces.

Sampling of point samples from plates, folded sheets, strips or tapes is carried out by milling along the cross section.

Sampling of point samples from clad sheets, strips and tapes is carried out after mechanical or chemical removal of the cladding layer.

Sampling of varnished and painted semi-finished products is carried out after mechanical or chemical removal of the corresponding coating.

(Revised edition, Rev. No. 1).

1.5.5. A point sample from bars and profiles is taken by turning the full cross section, filing the end surface, repeated sawing perpendicular to the axis, cutting; perpendicular to the axis and milling the end face or drilling bars at randomly selected points.

1.5.6. A point sample from pipes is taken by drilling perpendicular to the axis at several points, turning the end surface, cutting into small pieces or milling.

1.5.7. A point sample from a wire with a diameter of more than 3 mm is taken by turning the cross section, multiple cutting or sawing; from wire with a diameter of 3 mm or less - by cutting into small pieces. Wire with a diameter of more than 3 mm can be rolled before cutting.

(Revised edition, Rev. No. 2).

1.5.8. A spot sample from the foil is taken by cutting into small pieces of a piece of foil taken from the roll or by punching with automatic sampling in a continuous production process.

A point sample from the foil in sheets is taken by cutting the required number of sheets taken from the pack.

An incremental sample from laminated, varnished or colored foil is taken after mechanical or chemical decoating.

1.5.9. A point sample from forgings and stampings of plates is taken after cutting perpendicular to the axis by drilling or turning by milling the end surface.

1.5.10. An incremental sample from granular and lumpy metals is taken from the packaging place with a probe of an appropriate design, which should ensure the representativeness of the sample at all stages of its selection and preparation.

It is allowed to subject the taken sample to grinding to the required particle size.

1.5.8 - 1.5.10

2. PREPARATION OF THE POOL AND LABORATORY SAMPLE

2.1a. When preparing a pooled sample, the obtained incremental samples are thoroughly mixed on a clean surface and, if necessary, crushed to obtain particles of the required size.

(Introduced additionally, ch. No. 1).

2.1. Depending on the mass of the combined sample, a part of the combined sample is taken by quartering or the entire combined sample is used to prepare a sample for chemical analysis.

Note. It is allowed in the regulatory and technical documentation for specific products to establish the definition of the chemical composition of each sample for an incremental sample.

During quartering, the combined sample is evenly distributed on the surface and divided into four equal sectors by two straight lines intersecting in the center perpendicular to each other. For quartering, it is recommended to use a cross. The metal of two diametrically opposite sectors is removed, and the other two are joined together.

If necessary, this operation is repeated, each time removing the metal of the opposite sectors.

2.2. The minimum mass of a laboratory sample is set depending on the number of elements to be determined and in accordance with the requirements of the standards for methods of chemical analysis, as well as taking into account the mass of the spare sample.

2.3. A laboratory sample of non-magnetic metals and alloys must be cleaned of possible iron impurities with a magnet of sufficient power.

2.4. The laboratory sample is divided into two equal parts and placed in two appropriate packages that ensure the safety of the samples: one is intended for chemical analysis at the manufacturer, the other is kept in case of disagreement in the assessment of the quality of the lot.

At the request of the consumer, the laboratory sample is divided into three equal parts, while the third part is intended for chemical analysis at the consumer. In case of disagreement in the assessment of quality, it is allowed to repeat sampling for chemical analysis.

2.1 - 2.4. (Revised edition, Rev. No. 1).

2.5. Each package must be provided with a label indicating the type of blank or semi-finished product, grade of metal or alloy, batch or melt number, date of sampling, trademark or name of the manufacturer.

The same label must be included in each package, except for samples intended for the determination of carbon content. Packages must be sealed.

The shelf life of spare samples is at least 6 months.

(Changed edition, Rev. No. 1, 2).

INFORMATION DATA

1 . DESIGNED AND INTRODUCED by the Ministry non-ferrous metallurgy of the USSR

DEVELOPERS

A.M. Rytikov, M.B. Taubkin, A.A. Bulk

2 . APPROVED AND INTRODUCED BY Decree State Committee USSR according to the standards of 10.06.80 No. 2688

3 . INTRODUCED FOR THE FIRST TIME

4 . REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

5 . The validity period was extended until 07/01/95 by the Decree of the USSR State Committee for Product Quality Management and Standards dated 11/17/89 No. 3394

6 . REPUBLICATION (July 1991) with Amendments No. 1, 2, approved in November 1985, November 1989 (IUS 2-86, 2-90)

INTERSTATE STANDARD

Date of introduction 01.07.80

This International Standard establishes general requirements for the collection and preparation of samples for chemical analysis (excluding gas analysis) of non-ferrous metals and alloys.

The standard does not establish general requirements for sampling methods for chemical analysis of rare, precious metals and their alloys, high purity metals, mercury, hard alloys and sponge titanium, as well as to determine the content of gases.

Terms and definitions - according to GOST 15895-77 *.

* In the territory Russian Federation valid GOST R 50779.10-2000 and GOST R 50779.11-2000.

1. SAMPLING

1.1. Sampling is carried out from blanks and semi-finished products from non-ferrous metals and alloys.

1.2. The method of sampling, the mass of the sample is set in the regulatory and technical documentation for specific products.

1.3. Sampling may be carried out at the manufacturer's plant from liquid metal or alloy by casting ingots, if this is specified in the standards for specific products.

For sampling, a device is used that is resistant to the liquid metal or alloy and does not affect the chemical composition of the ingot. Sampling conditions must ensure that the chemical composition of the selected ingots corresponds to the average chemical composition of the melt.

The ingots must be marked with the melt number and the designation of the metal or alloy grade.

1.4. Methods and conditions for sampling point samples

1.4.1. Point samples are taken from each selected workpiece or semi-finished product in equal quantities.

The method of taking point samples is indicated in the table.

Type of blanks and semi-finished products	Sampling method	Sample appearance
Cathodes, anodes, ingots, blocks and flat horizontally cast ingots	Drilling, milling, sawing	Shavings, sawdust
Vertically cast ingots (flat, round and square)	Drilling, sawing, milling, turning	Shavings, sawdust
Plates, sheets, tapes and strips with a thickness of more than 1 mm	Drilling, milling	Shavings, sawdust
Sheets, strips, tapes with a thickness of 1 mm or less	Cutting, punching, milling	small pieces
Bars and profiles	Turning, sawing, milling, drilling, filing	Shavings, sawdust
Pipes with a wall thickness of more than 0.5 mm
Pipes with a wall thickness of 0.5 mm or less		small pieces
Wire diameter over 3 mm	Turning, sawing, cutting	Shavings, sawdust, small pieces
Wire with a diameter of 3 mm or less		small pieces
	Cutting, stamping	small pieces
Forgings, stampings and plates	Drilling, turning, milling
Granular and lumpy metals	direct selection	small particles

Note. Spot sampling from semi-finished products and blanks with an uneven distribution of components and impurities (for example, from anti-friction alloys) by drilling is not allowed.

When taking incremental samples by milling or turning, the machining speed should be such that there would be no tearing out of the softer phase.

1.4.2. Machines should be used to take incremental samples. and tools that ensure the appropriate size and type of sample and exclude its contamination.

1.4.3. The surface of blanks or semi-finished products before sampling must be cleaned of surface contaminants and oxides (with a metal brush, turning, milling or other methods).

(Revised edition, Rev. No. 1).

1.4.4. Sampling must be carried out dry, without the use of coolants and lubricants, at a processing speed that excludes its overheating and oxidation.

1.4.5. The pooled sample should be thoroughly mixed and, if necessary, crushed.

1.5. Spot sampling location

A point sample can also be taken by milling the inner faces obtained by sawing the anode cathode into four diagonal parts.

By agreement between the manufacturer and the consumer, other methods of taking point samples are allowed.

(Changed edition, Rev. No. 1, 2).

1.5.2. A point sample from ingots and horizontally cast ingots is taken by drilling, sawing or milling.

The diameter of the drill used should be from 10 to 20 mm.

A point sample from a large-sized ingot (block) is taken by drilling at three points of any side face: one drilling is carried out in the middle of the ingot and two at a distance of 1/6 of the ingot height to a depth of at least 50 mm.

It is allowed to take a sample from the blocks by cutting off two diagonally opposite corners along the entire height of the block.

1.5.3. A point sample from vertically cast ingots (flat, round and square) is taken by drilling, sawing or milling.

Drilling of templates from ingots of round section is carried out in the middle, at distances equal to 1/4, 2/4 and 3/4 of the radius.

Point sampling by sawing ingots is carried out perpendicular to its longitudinal axis, so as to save the workpiece for subsequent technological processing.

Point sampling by milling of vertically cast ingots, except for round ingots, is carried out over the entire section.

For ingots of round cross section from alloys with low segregation, it is allowed to take a point sample by turning the ingot along the generatrix in several places.

(Changed edition, Rev. No. 1, 2).

1.5.4. Spot samples from sheets, strips and tapes are taken from a segment covering the entire width of the semi-finished product.

A segment with a thickness of more than 1 mm is drilled through at several points.

It is allowed to select chips by repeated drilling of folded segments. A segment up to 1 mm thick is cut into small pieces.

Sampling of point samples from plates, folded sheets, strips or tapes is carried out by milling along the cross section.

Sampling of point samples from clad sheets, strips and tapes is carried out after mechanical or chemical removal of the cladding layer.

Sampling of varnished and painted semi-finished products is carried out after mechanical or chemical removal of the corresponding coating.

(Revised edition, Rev. No. 1).

1.5.5. A point sample from bars and profiles is taken by turning the full cross section, filing the end surface, multiple sawing perpendicular to the axis, cutting perpendicular to the axis and milling the end surface or drilling the bars at randomly selected points.

1.5.6. A point sample from pipes is taken by drilling perpendicular to the axis at several points, turning the end surface, cutting into small pieces or milling.

(Revised edition, Rev. No. 2).

1.5.8. A point sample from the foil is taken by cutting into small pieces of a piece of foil taken from the roll or by stamping with automatic sampling in the process. continuous production.

A point sample from the foil in sheets is taken by cutting the required number of sheets taken from the pack.

An incremental sample from laminated, varnished or colored foil is taken after mechanical or chemical decoating.

1.5.9. A point sample from forgings and stampings of plates is taken after cutting perpendicular to the axis by drilling or turning by milling the end surface.

It is allowed to subject the taken sample to grinding to the required particle size.

1.5.8 - 1.5.10 (Revised edition, Rev. No. 1).

2. PREPARATION OF THE POOL AND LABORATORY SAMPLE

2.1a. When preparing a pooled sample, the obtained incremental samples are thoroughly mixed on a clean surface and, if necessary, crushed to obtain particles of the required size.

(Introducedadditionally, ch. No. 1).

2.1. Depending on the mass of the combined sample, a part of the combined sample is taken by quartering or the entire combined sample is used to prepare a sample for chemical analysis.

Note. It is allowed in the regulatory and technical documentation for specific products to establish the definition of the chemical composition of each sample for an incremental sample.

If necessary, this operation is repeated, each time removing the metal of the opposite sectors.

2.3. A laboratory sample of non-magnetic metals and alloys must be cleaned of possible iron impurities with a magnet of sufficient power.

2.1 - 2.4. (Revised edition, Rev. No. 1).

The same label must be included in each package, except for samples intended for the determination of carbon content. Packages must be sealed.

The shelf life of spare samples is at least 6 months.

(Changed edition, Rev. No. 1, 2).

INFORMATION DATA

1 . DEVELOPED AND INTRODUCED by the Ministry of Nonferrous Metallurgy of the USSR

2 . APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 10.06.80 No. 2688

3 . INTRODUCED FOR THE FIRST TIME

4 . REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

5 . The validity period was removed according to protocol No. 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

6 . EDITION with Amendments No. 1, 2, approved in November 1985, November 1989 (IUS 2-86, 2-90)

GOST 24231-80

Group B59

INTERSTATE STANDARD

NON-FERROUS METALS AND ALLOYS

General requirements to the selection and preparation of samples for chemical analysis

Non-ferrous metals and alloys. General requirements for sampling
and sample preparation for chemical analysis

OKSTU 1709

Introduction date 1980-07-01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Nonferrous Metallurgy of the USSR

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 10.06.80 N 2688

3. INTRODUCED FOR THE FIRST TIME

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number
GOST 15895-77*	Introduction

_______________
* On the territory of the Russian Federation, GOST R 50779.10-2000, GOST R 50779.11-2000 apply, hereinafter in the text. - Database manufacturer's note.

5. The limitation of the validity period was removed according to protocol N 4-93 of the Interstate Council for Standardization, Metrology and Certification (IUS 4-94)

6. EDITION with Amendments No. 1, 2, approved in November 1985, November 1989 (IUS 2-86, 2-90)

This International Standard establishes general requirements for the collection and preparation of samples for chemical analysis (excluding gas analysis) of non-ferrous metals and alloys.

Terms and definitions - according to GOST 15895.

1. SAMPLING

1.1. Sampling is carried out from blanks and semi-finished products from non-ferrous metals and alloys.

1.2. The method of sampling, the mass of the sample is set in the regulatory and technical documentation for specific products.

1.3. Sampling may be carried out at the manufacturer's plant from liquid metal or alloy by casting ingots, if this is specified in the standards for specific products.

The ingots must be marked with the melt number and the designation of the metal or alloy grade.

1.4. Methods and conditions for sampling point samples

1.4.1. Point samples are taken from each selected workpiece or semi-finished product in equal quantities.

The method of taking point samples is indicated in the table.

Type of blanks and semi-finished products	Sampling method	Sample appearance
Cathodes, anodes, ingots, blocks and flat horizontally cast ingots	Drilling, milling, sawing	Shavings, sawdust
Vertically cast ingots (flat, round and square)	Drilling, sawing, milling, turning	Shavings, sawdust
Plates, sheets, tapes and strips with a thickness of more than 1 mm	Drilling, milling	Shavings, sawdust
Sheets, strips, tapes with a thickness of 1 mm or less	Cutting, punching, milling	small pieces
Bars and profiles	Turning, sawing, milling, drilling, filing	Shavings, sawdust
Pipes with a wall thickness of more than 0.5 mm		Shavings
Pipes with a wall thickness of 0.5 mm or less		small pieces
Wire diameter over 3 mm	Turning, sawing, cutting	Shavings, sawdust, small pieces
Wire with a diameter of 3 mm or less		small pieces
Foil	Cutting, stamping	small pieces
Forgings, stampings and plates	Drilling, turning, milling	Shavings
Granular and lumpy metals	direct selection	small particles

Note. Spot sampling from semi-finished products and blanks with an uneven distribution of components and impurities (for example, from anti-friction alloys) by drilling is not allowed.

When taking incremental samples by milling or turning, the machining speed should be such that there was no tearing out of the softer phase.

1.4.2. To take incremental samples, machines and tools should be used that provide the appropriate size and type of sample and exclude its contamination.

1.4.3. The surface of blanks or semi-finished products before sampling must be cleaned of surface contaminants and oxides (with a metal brush, turning, milling or other methods).

(Changed edition, Rev. N 1).

1.4.4. Sampling must be carried out dry, without the use of coolants and lubricants, at a processing speed that excludes its overheating and oxidation.

1.4.5. The pooled sample should be thoroughly mixed and, if necessary, crushed.

1.5. Spot sampling location

A point sample can also be taken by milling the inner faces obtained by sawing the anode cathode into four diagonal parts.

By agreement between the manufacturer and the consumer, other methods of taking point samples are allowed.

(Changed edition, Rev. N 1, 2).

1.5.2. A point sample from ingots and horizontally cast ingots is taken by drilling, sawing or milling.

Each ingot selected in the sample, or an ingot up to 100 mm thick, is drilled through at five points: in the middle and at four points diagonally - at a distance from to diagonal from the corner.

With a thickness of an ingot or an ingot of more than 100 mm, the workpieces are drilled at six points: three on the upper and lower surfaces, while one drilling is carried out in the middle and two - at a distance from to the diagonal from the corners, to a depth equal to half the height of the workpiece.

The diameter of the drill used should be from 10 to 20 mm.

Each pig or ingot is sawn or milled in three places: in the middle and at equal distances from the middle - approximately at a distance of the length of the ingot or ingot. Milled to thickness.

A point sample from a large-sized ingot (block) is taken by drilling at three points of any side face: one drilling is carried out in the middle of the ingot and two at a distance of a little height to a depth of at least 50 mm.

It is allowed to take a sample from the blocks by cutting off two diagonally opposite corners along the entire height of the block.

1.5.3. A point sample from vertically cast ingots (flat, round and square) is taken by drilling, sawing or milling.

Drilling of templates from ingots of round section is carried out in the middle, at distances equal to , and radius.

Vertically cast nickel and cobalt ingots are drilled at three points: one third of the original sample is drilled in the center, another third at the height distance and the last third at the height of the ingot.

Point sampling by sawing ingots is carried out perpendicular to its longitudinal axis, so as to save the workpiece for subsequent technological processing.

Point sampling by milling of vertically cast ingots, except for round ingots, is carried out over the entire section.

For ingots of round cross section from alloys with low segregation, it is allowed to take a point sample by turning the ingot along the generatrix in several places.

(Changed edition. Rev. N 1, 2).

1.5.4. Spot samples from sheets, strips and tapes are taken from a segment covering the entire width of the semi-finished product.

A segment with a thickness of more than 1 mm is drilled through at several points.

It is allowed to select chips by repeated drilling of folded segments. A segment up to 1 mm thick is cut into small pieces.

Sampling of point samples from plates, folded sheets, strips or tapes is carried out by milling along the cross section.

Sampling of point samples from clad sheets, strips and tapes is carried out after mechanical or chemical removal of the cladding layer.

Sampling of lacquered and painted semi-finished products is carried out after mechanical or chemical removal of the corresponding coating.

(Changed edition, Rev. N 1).

1.5.6. A point sample from pipes is taken by drilling perpendicular to the axis at several points, turning the end surface, cutting into small pieces or milling.

(Changed edition, Rev. N 2).

1.5.8. A spot sample from the foil is taken by cutting into small pieces of a piece of foil taken from the roll or by punching with automatic sampling in a continuous production process.

A point sample from the foil in sheets is taken by cutting the required number of sheets taken from the pack.

An incremental sample from laminated, varnished or colored foil is taken after mechanical or chemical decoating.

1.5.9. A point sample from forgings and stampings of plates is taken after cutting perpendicular to the axis by drilling or turning by milling the end surface.

It is allowed to subject the taken sample to grinding to the required particle size.

1.5.8-1.5.10 (Changed edition, Rev. N 1).

2. PREPARATION OF THE POOL AND LABORATORY SAMPLE

2.1a. When preparing a pooled sample, the obtained incremental samples are thoroughly mixed on a clean surface and, if necessary, crushed to obtain particles of the required size.

(Introduced additionally, Rev. N 1).

2.1. Depending on the mass of the combined sample, a part of the combined sample is taken by quartering or the entire combined sample is used to prepare a sample for chemical analysis.

Note. It is allowed in the regulatory and technical documentation for specific products to establish the definition of the chemical composition of each sample for an incremental sample.

If necessary, this operation is repeated, each time removing the metal of the opposite sectors.

2.3. A laboratory sample of non-magnetic metals and alloys must be cleaned of possible iron impurities with a magnet of sufficient power.

2.1-2.4. (Changed edition, Rev. N 1).

The same label must be included in each package, except for samples intended for the determination of carbon content. Packages must be sealed.

The shelf life of spare samples is at least 6 months.

(Changed edition, Rev. N 1, 2).

General requirements for the selection and preparation of samples for chemical
analysis

Non-ferrous metals and alloys. General requirements for sampling
and sample preparation for chemical
analysis

Introduction date 01.07.80

This International Standard establishes general requirements for the collection and preparation of samples for chemical analysis (excluding gas analysis) of non-ferrous metals and alloys.

Terms and definitions - according to GOST 15895-77 *.

* On the territory of the Russian Federation, GOST R 50779.10-2000 and GOST R 50779.11-2000 apply.

. SAMPLE SELECTION

1.5.3 . A point sample from vertically cast ingots (flat, round and square) is taken by drilling, sawing or milling.

Drilling of templates from ingots of round section is carried out in the middle, at distances equal to 1/4, 2/4 and 3/4 of the radius.

Point sampling by sawing ingots is carried out perpendicular to its longitudinal axis, so as to save the workpiece for subsequent technological processing.

Point sampling by milling of vertically cast ingots, except for round ingots, is carried out over the entire section.

For ingots of round cross section from alloys with low segregation, it is allowed to take a point sample by turning the ingot along the generatrix in several places.

(Changed edition, Rev. No. 1, 2).

1.5.4 . Point samples from sheets, strips and tapes are taken from a segment covering the entire width of the semi-finished product.

A segment with a thickness of more than 1 mm is drilled through at several points.

It is allowed to select chips by repeated drilling of folded segments. A segment up to 1 mm thick is cut into small pieces.

Sampling of point samples from plates, folded sheets, strips or tapes is carried out by milling along the cross section.

Sampling of point samples from clad sheets, strips and tapes is carried out after mechanical or chemical removal of the cladding layer.

Sampling of varnished and painted semi-finished products is carried out after mechanical or chemical removal of the corresponding coating.

(Revised edition, Rev. No. 1).

1.5.5 . A point sample from bars and profiles is taken by turning the full cross section, filing the end surface, multiple sawing perpendicular to the axis, cutting perpendicular to the axis and milling the end surface or drilling the bars at randomly selected points.

1.5.6 . A point sample from pipes is taken by drilling perpendicular to the axis at several points, turning the end surface, cutting into small pieces or milling.

1.5.7 . A point sample from a wire with a diameter of more than 3 mm is taken by turning the cross section, multiple cutting or sawing; from wire with a diameter of 3 mm or less - by cutting into small pieces. Wire with a diameter of more than 3 mm can be rolled before cutting.

(Revised edition, Rev. No. 2).

1.5.8 . A spot sample from the foil is taken by cutting into small pieces of a piece of foil taken from the roll or by punching with automatic sampling in a continuous production process.

A point sample from the foil in sheets is taken by cutting the required number of sheets taken from the pack.

An incremental sample from laminated, varnished or colored foil is taken after mechanical or chemical decoating.

1.5.9 . A point sample from forgings and stampings of plates is taken after cutting perpendicular to the axis by drilling or turning by milling the end surface.

1.5.10 . An incremental sample from granular and lumpy metals is taken from the packaging place with a probe of an appropriate design, which should ensure the representativeness of the sample at all stages of its selection and preparation.

It is allowed to subject the taken sample to grinding to the required particle size.

1.5.8 - 1.5.10 (Revised edition, Rev. No. 1).

2. PREPARATION OF THE POOL AND LABORATORY SAMPLE

. SAMPLE SELECTION

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