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GB/T 15574-2016 English PDF (GBT15574-2016)

GB/T 15574-2016 English PDF (GBT15574-2016)

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GB/T 15574-2016: Steel products classification
GB/T 15574-2016
ICS 77.140.01
H 40
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
Replacing GB/T 15574-1995
Steel products classification
(ISO 6929.2013, Steel products - Vocabulary, MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JANUARY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China;
China National Standardization Management Committee.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Classification ... 5 
3 Liquid steel ... 5 
4 Ingots and semi-finished products ... 5 
5 Rolled finished-products and end products ... 7 
6 Other products ... 23 
APPENDIX A (Informative) Frame diagram of steel products (except for liquid
steel) classification ... 25 
APPENDIX B (Informative) Sheet piling schematics ... 29 
Appendix C (Informative) Cross-sectional shape schematics of mining frame
sections ... 32 
Appendix D (Informative) Schematics of typical heavy sections ... 33 
Appendix E (Informative) Clause number comparison list of this standard and
ISO 6929.2013 ... 34 
Appendix F (Informative) Technical differences between this standard and
ISO 6929.2013 AND their causes ... 38 
Foreword
This standard was drafted in accordance with the provisions as specified in
GB/T 1.1-2009.
This standard replaces GB/T 15574-1995 "Steel products classification".
As compared with GB/T 15574-1995, the main technical changes of this
standard are as follows.
- From the classification, DELETE the “primary product”, “forged bar”,
“other steel products classification”; ADD the “liquid steel”; and MODIFY
the “semi-finished product” into “ingot and semi-finished product” (see
Chapter 2; Chapter 2 of 1995 version);
- From the rolled product and end product, DELETE the “General
provisions” (see Chapter 5; 6.1 of 1995 version);
- In the ingots and semi-finished products, ADD the round billet, VAR
ingot, ESR ingot (see Chapter 4; Chapter 5 of 1995 version);
- In the metal-coated sheet and strip, ADD the aluminum-zinc coated
sheet and strip, lead-tin alloy coated sheet and strip, electrolytically
metal-coated sheet and strip, electrolytically zinc-coated sheet and strip,
electrolytically zinc-nickel coated sheet and strip, electrolytically lead-tin
coated sheet and strip (see 5.1.1.2.1; 6.3.1.2.1 of 1995 version);
- In the hot finished bar, ADD the forged bar, hollow mining drill bar (see
5.2.3.2 AND 5.2.3.3; 6.2.1.2.1 of 1995 version);
- In the railway materials, ADD the products which are used for other
railway system (see 5.2.1.6.1; 6.2.4 of 1995 version);
- In the sheet piling, ADD the hat type sheet piling, composite walls, cold
formed sheet piling, AND interlocked connections (see 5.2.6.2.1; 6.2.5
of 1995 version);
- In the tubular products, ADD fittings; in the welded tubes, ADD the
submerged arc welded steel tubes, electrical resistance welded steel
tubes, AND butt welded steel tubes (see 5.2.9; 6.2.7.1 of 1995 version);
- ADJUST the following classification requirements. 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
Steel product classification
1 Scope
This standard specifies the basic criteria for classification of steel products in
accordance with the production process, shape, size and surface condition.
This standard applies to the classification of steel products in accordance
with the production process, shape, size and surface condition.
2 Classification
Steel products are usually divided into four categories.
a) Liquid steel (see Chapter 3);
b) Ingots and semi-finished products (see Chapter 4);
c) Rolled finished products and end products (see Chapter 5);
d) Other products (see Chapter 6).
3 Liquid steel
It refers to the steel in liquid state which is obtained through smelting or direct
melting of the raw materials, AND it is used for ingot casting, continuous
casting OR forging steel products.
4 Ingots and semi-finished products
4.1 Ingot
It refers to the product obtained by casting liquid steel into moulds of a certain
shape. The ingot mould’s shape shall be similar to the shape of the hot-rolled
OR wrought processed material.
The cross section of the ingot used for rolling a profile may be square,
rectangular (width to thickness ratio less than 2), polygonal, circular, elliptical,
and various special shapes.
The cross section of the flat ingot which is used for rolling a sheet is
rectangular, AND its width to thickness ratio is not less than 2.
For the purposes of further processing, under the conditions of not changing
the original classifications of ingots, it is also allowed to make it subject to the
treatment below.
a) USE an abrasive tool OR spray gun to clear all surface defects;
b) CUT the head and tail; or otherwise CUT it to the length facilitate to further
processing;
c) After surface cleaning, CONDUCT cutting operation.
4.2 Semi-finished products
It refers to the product obtained from a rolled or forged ingot, OR obtained by
continuous casting. The semi-finished products are usually used for further
rolling or forging into finished products.
The cross-sections of the semi-finished products may be of various shapes
(see 4.2.1 ~ 4.2.8); the cross-sectional dimensions are constant along the
length direction with wider tolerances than those of the finished products
AND side corners more or less rounded. It is allowed for the side surfaces to
have slightly convex or concave, as well as rolling, forging or continuous
casting marks, AND they can be partly or totally dressed to remove surface
defects, e.g. by cutting, flame re-melting or grinding.
4.2.1 Semi-finished products of square cross section
4.2.1.1 Square blooms
Its side length is not less than 200mm.
4.2.1.2 Square billet
Its side length is less than 200mm AND not less than 50mm.
4.2.2 Semi-finished products of rectangular cross section
4.2.2.1 Rectangular blooms
It refers to the semi-finished products the cross-sectional area of which is not
less than 40000 mm2 AND the width to thickness ratio of which is less than 2.
4.2.2.2 Rectangular billets
It refers to the semi-finished products the cross-sectional area of which is not
less than 2500 mm2 and less than 40000 mm2, AND the width to thickness
ratio of which is less than 2.
a) Hot-rolled wide strip. the nominal width is not less than 600 mm;
b) Hot-rolled slit wide strip. after rolling, the nominal width is not less than
600 mm; after edge trimming, the nominal width is less than 600 mm;
c) Hot-rolled narrow strip. after rolling, the nominal width is less than 600
mm.
5.1.1.2 Cold-rolled uncoated flat products
It refers to the product, after cold rolling, the cross-sectional area reduction of
which is not less than 25%. As for the flat products of widths less than 600
mm and for certain qualities of special steels, it may include the products with
a reduction in cross-sectional area of less than 25%.
5.1.1.2.1 Cold-rolled sheet and plate
It refers to the cold-rolled flat products, the edges of which are allowed to
deform freely, supplied flat and generally in square or rectangular shapes
with a width of 600 mm or over; but also in any other shapes, e.g. circular or
in accordance with the drawing. The edges may a...
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