Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 15574-1995 Steel product classification and definitions.
The following main technical changes have been made with respect to GB/T 15574-1995:
——In the classification, "initial product", "forged bar steel" and "other product classification of steel” are deleted, "liquid steel” is added, and "semi-finished product" is modified to "ingots and semi-finished product" (see clause 2; clause 2 of Edition 1995);
——For rolled finished products and end products, "General requirements" is deleted (see clause 5; 6.1 of Edition 1995);
——For ingots and semi-finished product, round billets, VAR ingot and ESR ingot are added (see clause 4; clause 5 of Edition 1995);
——For metal-coated sheet and strip, aluminum-zinc coated sheet and strip, lead-tin alloy coated sheet and strip (terne plate), electrolytically metal-coated sheet and strip, electrolytically zinc-coated sheet and strip, electrolytically zinc-nickel coated sheet and strip and electrolytically lead-tin coated sheet and strip are added (see 5.1.4.1; 6.3.1.2.1 of Edition 1995);
——For hot finished bars, forged bars and hollow mining drill bars are added (see 5.2.3.2 and 5.2.3.3; 6.2.1.2.1 of Edition 1995);
——For railway materials, products for other rail systems are added (see 5.2.6.1; 6.2.4 of Edition 1995);
——For sheet piling, the hat shape sheet piling, combined walls, cold-formed sheet piling and locking connectors are added (see 5.2.6.2.1; 6.2.5 of Edition 1995);
——For tubular products, the fittings are added; and for welded tubes, submerged arc welded tubes, electric-resistance welded tubes and butt welded tubes are added (see 5.2.9; 6.2.7.1 of Edition 1995);
——The requirements are adjusted for the following categories, including: square blooms, square billets, rectangular blooms, rectangular billets, blank for tubes and pipes, uncoated flat product, hot rolled uncoated flat product, wide flat, hot-rolled sheet and plate, hot-rolled strip, cold-rolled sheet and plate, electrical steel, non-oriented grain electrical steel, grain-oriented electrical steel, electrolytic chromium/chromium oxide coated steel, zinc-coated sheet and strip, aluminum of aluminum-silicon alloy coated sheet and strip, lead-tin alloy coated sheet and strip (terne plate), electrolytically zinc-coated sheet and strip, and heavy railway materials.
——The frame diagrams of the steel products (excluding liquid steel) classification are added (see Annex A);
——The names of steel products are added (see Annex G).
This standard has been redrafted and modified in relation to ISO 6929: 2013 Steel products - Vocabulary.
This standard is partially changed from ISO 6929: 2013 in structure; the comparison table for clause/subclause numbers in this standard and those in ISO 6929: 2013 are listed in Annex E.
Technical changes have been made in this standard with respect to ISO 6929:2013, and marked with perpendicular single line (|) at the margin of relevant clauses; see Annex F for the list of technical changes and their reasons.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous edition of this standard is as follows:
——GB/T 15574-1995.
Steel products classification
1 Scope
This standard specifies the basic criteria for classifying steel products by the production process, shape, dimension and surface condition.
This standard is applicable to the classification of steel products by the production process, shape, dimension and surface condition.
2 Classification
The steel products are usually divided into four categories:
a) liquid steel (see clause 3);
b) ingots and semi-finished products (see clause 4);
c) rolled finished products and end products (see clause 5);
d) other products (see clause 6).
3 Liquid steel
Steel in the liquid state ready for pouring and obtained from the direct melting of raw materials, which is used for ingot casting, continuous casting or cast steel castings.
4 Ingots and semi-finished products
4.1 Ingots
Products obtained by pouring liquid steel into moulds of a shape appropriate. The shape of ingot moulds shall be similar to that of products processed by hot rolling or forging.
The ingots used for the profile to be rolled may have a cross section that is square, rectangular (of width up to twice the thickness), polygonal, round, oval, or shaped;
The slab ingots used for the plate to be rolled shall have a rectangular cross section, with a width twice the thickness or over.
For the needs of further processing, the following treatments may also be conducted without changing the original classification of ingots:
a) cleaning all surface defects with grinding tools or spray guns;
b) cutting the head and tail or cutting to a length convenient for further processing;
c) cutting after surface cleaning.
4.2 Semi-finished product
It refers to the product obtained by rolling or forging steel ingots, or by continuous casting. Semi-finished products are usually used for further rolling or forging into finished products.
The cross sections may be of various shapes (see 4.2.1~4.2.8); the cross-sectional dimensions are constant along the length with wider tolerances than those of the corresponding flat or long products and side corners more or less rounded. The side surfaces of semi-finished products are allowed to be slightly convex or concave, retaining rolling, forging, or continuous casting marks and may be partly or totally dressed, e.g. by cutting, flame melting, or grinding.
4.2.1 Semi-finished product of square cross section
4.2.1.1 Square blooms
Semi-finished products with a side length of no less than 200mm.
4.2.1.2 Square billets
Semi-finished products with a side length of not less than 50mm and less than 200mm.
4.2.2 Semi-finished product of rectangular cross section
4.2.2.1 Rectangular blooms
Semi-finished products with a cross section area no less than 40,000mm2 and width-to-thickness ratio less than 2.
4.2.2.2 Rectangular billets
Semi-finished products with a cross section area no less than 2,500mm2 and less than 40,000mm2 and width-to-thickness ratio less than 2.
4.2.3 Slabs
Products with a thickness no less than 50mm and width-to-thickness ratio no less than 2.
4.2.4 Round billets
Semi-finished products by continuous casting, rolling or forging from circular cross section.
4.2.5 Blank for tubes and pipes
Semi-finished products for producing steel pipes, the cross section of which may be round, square, rectangular or polygonal.
4.2.6 Blanks for sections
Semi-finished products for producing section steel and those formed by pre-processing, the cross section area of which is generally greater than 2,500 mm2.
4.2.7 VAR ingot
Semi-finished products of round ingots or billets, which are obtained by melting metal raw materials and remelting ingots or billets in a vacuum arc remelting (VAR) furnace.
4.2.8 ESR ingot
Semi-finished products of round ingots or billets, which are obtained by melting metal raw materials and remelting ingots or billets in an electroslag remelting (ESR) furnace.
5 Rolling finished products and end products
5.1 Flat product
Product having rectangular cross sections, the width being much greater than the thickness.
Note: The surfaces are generally smooth except for certain products, e.g. floor plates, that show regular raised or indented surface patterns.
5.1.1 Uncoated flat product
Flat product without any coating or surface treatment. Flat products that have received a simple coating for the purpose of protection from rust or mechanical damage, e.g. passivation, organic coatings, paper, oil, and lacquer, are defined as uncoated flat products.
5.1.1.1 Hot rolled uncoated flat product
Flat product manufactured by hot rolling semi-finished products or by hot rolling ingots. Hot-rolled flat products include those that have been subjected to a light cold-rolling pass, normally less than 5% reduction.
5.1.1.1.1 Wide flat
Flat product of width over 150 mm up to and including 1,250 mm and nominal thickness generally over 4 mm, supplied in lengths, i.e. not coiled, and the edges are angular; wide flat is obtained by hot rolling on four sides (or in box passes) or shearing or flame cutting the wider flat products.
Foreword i
1 Scope
2 Classification
3 Liquid steel
4 Ingots and semi-finished products
5 Rolling finished products and end products
6 Other products
Annex A (Informative) Frame diagrams of steel products (excluding liquid steel) classification
Annex B (Informative) Schematic diagram for sheet piling
Annex C (Informative) Schematic diagram for cross-section of mining frame sections
Annex D (Informative) Schematic diagram for typical heavy sections
Annex E (Informative) Comparison between clause numbers in this standard and those in ISO 6929:
Annex F (Informative) Technical differences between this standard and ISO 6929: 2013 and the relevant reasons
Annex G (Informative) Names of steel products
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 15574-1995 Steel product classification and definitions.
The following main technical changes have been made with respect to GB/T 15574-1995:
——In the classification, "initial product", "forged bar steel" and "other product classification of steel” are deleted, "liquid steel” is added, and "semi-finished product" is modified to "ingots and semi-finished product" (see clause 2; clause 2 of Edition 1995);
——For rolled finished products and end products, "General requirements" is deleted (see clause 5; 6.1 of Edition 1995);
——For ingots and semi-finished product, round billets, VAR ingot and ESR ingot are added (see clause 4; clause 5 of Edition 1995);
——For metal-coated sheet and strip, aluminum-zinc coated sheet and strip, lead-tin alloy coated sheet and strip (terne plate), electrolytically metal-coated sheet and strip, electrolytically zinc-coated sheet and strip, electrolytically zinc-nickel coated sheet and strip and electrolytically lead-tin coated sheet and strip are added (see 5.1.4.1; 6.3.1.2.1 of Edition 1995);
——For hot finished bars, forged bars and hollow mining drill bars are added (see 5.2.3.2 and 5.2.3.3; 6.2.1.2.1 of Edition 1995);
——For railway materials, products for other rail systems are added (see 5.2.6.1; 6.2.4 of Edition 1995);
——For sheet piling, the hat shape sheet piling, combined walls, cold-formed sheet piling and locking connectors are added (see 5.2.6.2.1; 6.2.5 of Edition 1995);
——For tubular products, the fittings are added; and for welded tubes, submerged arc welded tubes, electric-resistance welded tubes and butt welded tubes are added (see 5.2.9; 6.2.7.1 of Edition 1995);
——The requirements are adjusted for the following categories, including: square blooms, square billets, rectangular blooms, rectangular billets, blank for tubes and pipes, uncoated flat product, hot rolled uncoated flat product, wide flat, hot-rolled sheet and plate, hot-rolled strip, cold-rolled sheet and plate, electrical steel, non-oriented grain electrical steel, grain-oriented electrical steel, electrolytic chromium/chromium oxide coated steel, zinc-coated sheet and strip, aluminum of aluminum-silicon alloy coated sheet and strip, lead-tin alloy coated sheet and strip (terne plate), electrolytically zinc-coated sheet and strip, and heavy railway materials.
——The frame diagrams of the steel products (excluding liquid steel) classification are added (see Annex A);
——The names of steel products are added (see Annex G).
This standard has been redrafted and modified in relation to ISO 6929: 2013 Steel products - Vocabulary.
This standard is partially changed from ISO 6929: 2013 in structure; the comparison table for clause/subclause numbers in this standard and those in ISO 6929: 2013 are listed in Annex E.
Technical changes have been made in this standard with respect to ISO 6929:2013, and marked with perpendicular single line (|) at the margin of relevant clauses; see Annex F for the list of technical changes and their reasons.
This standard was proposed by China Iron and Steel Association.
This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China.
The previous edition of this standard is as follows:
——GB/T 15574-1995.
Steel products classification
1 Scope
This standard specifies the basic criteria for classifying steel products by the production process, shape, dimension and surface condition.
This standard is applicable to the classification of steel products by the production process, shape, dimension and surface condition.
2 Classification
The steel products are usually divided into four categories:
a) liquid steel (see clause 3);
b) ingots and semi-finished products (see clause 4);
c) rolled finished products and end products (see clause 5);
d) other products (see clause 6).
3 Liquid steel
Steel in the liquid state ready for pouring and obtained from the direct melting of raw materials, which is used for ingot casting, continuous casting or cast steel castings.
4 Ingots and semi-finished products
4.1 Ingots
Products obtained by pouring liquid steel into moulds of a shape appropriate. The shape of ingot moulds shall be similar to that of products processed by hot rolling or forging.
The ingots used for the profile to be rolled may have a cross section that is square, rectangular (of width up to twice the thickness), polygonal, round, oval, or shaped;
The slab ingots used for the plate to be rolled shall have a rectangular cross section, with a width twice the thickness or over.
For the needs of further processing, the following treatments may also be conducted without changing the original classification of ingots:
a) cleaning all surface defects with grinding tools or spray guns;
b) cutting the head and tail or cutting to a length convenient for further processing;
c) cutting after surface cleaning.
4.2 Semi-finished product
It refers to the product obtained by rolling or forging steel ingots, or by continuous casting. Semi-finished products are usually used for further rolling or forging into finished products.
The cross sections may be of various shapes (see 4.2.1~4.2.8); the cross-sectional dimensions are constant along the length with wider tolerances than those of the corresponding flat or long products and side corners more or less rounded. The side surfaces of semi-finished products are allowed to be slightly convex or concave, retaining rolling, forging, or continuous casting marks and may be partly or totally dressed, e.g. by cutting, flame melting, or grinding.
4.2.1 Semi-finished product of square cross section
4.2.1.1 Square blooms
Semi-finished products with a side length of no less than 200mm.
4.2.1.2 Square billets
Semi-finished products with a side length of not less than 50mm and less than 200mm.
4.2.2 Semi-finished product of rectangular cross section
4.2.2.1 Rectangular blooms
Semi-finished products with a cross section area no less than 40,000mm2 and width-to-thickness ratio less than 2.
4.2.2.2 Rectangular billets
Semi-finished products with a cross section area no less than 2,500mm2 and less than 40,000mm2 and width-to-thickness ratio less than 2.
4.2.3 Slabs
Products with a thickness no less than 50mm and width-to-thickness ratio no less than 2.
4.2.4 Round billets
Semi-finished products by continuous casting, rolling or forging from circular cross section.
4.2.5 Blank for tubes and pipes
Semi-finished products for producing steel pipes, the cross section of which may be round, square, rectangular or polygonal.
4.2.6 Blanks for sections
Semi-finished products for producing section steel and those formed by pre-processing, the cross section area of which is generally greater than 2,500 mm2.
4.2.7 VAR ingot
Semi-finished products of round ingots or billets, which are obtained by melting metal raw materials and remelting ingots or billets in a vacuum arc remelting (VAR) furnace.
4.2.8 ESR ingot
Semi-finished products of round ingots or billets, which are obtained by melting metal raw materials and remelting ingots or billets in an electroslag remelting (ESR) furnace.
5 Rolling finished products and end products
5.1 Flat product
Product having rectangular cross sections, the width being much greater than the thickness.
Note: The surfaces are generally smooth except for certain products, e.g. floor plates, that show regular raised or indented surface patterns.
5.1.1 Uncoated flat product
Flat product without any coating or surface treatment. Flat products that have received a simple coating for the purpose of protection from rust or mechanical damage, e.g. passivation, organic coatings, paper, oil, and lacquer, are defined as uncoated flat products.
5.1.1.1 Hot rolled uncoated flat product
Flat product manufactured by hot rolling semi-finished products or by hot rolling ingots. Hot-rolled flat products include those that have been subjected to a light cold-rolling pass, normally less than 5% reduction.
5.1.1.1.1 Wide flat
Flat product of width over 150 mm up to and including 1,250 mm and nominal thickness generally over 4 mm, supplied in lengths, i.e. not coiled, and the edges are angular; wide flat is obtained by hot rolling on four sides (or in box passes) or shearing or flame cutting the wider flat products.
Contents of GB/T 15574-2016
Foreword i
1 Scope
2 Classification
3 Liquid steel
4 Ingots and semi-finished products
5 Rolling finished products and end products
6 Other products
Annex A (Informative) Frame diagrams of steel products (excluding liquid steel) classification
Annex B (Informative) Schematic diagram for sheet piling
Annex C (Informative) Schematic diagram for cross-section of mining frame sections
Annex D (Informative) Schematic diagram for typical heavy sections
Annex E (Informative) Comparison between clause numbers in this standard and those in ISO 6929:
Annex F (Informative) Technical differences between this standard and ISO 6929: 2013 and the relevant reasons
Annex G (Informative) Names of steel products
