GB/T 15574-2016Steel products classification (English PDF)

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

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 & 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

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 as rolled or sheared, gas cut

or planed. If the nominal thickness is less than 3 mm, it is defined as

cold-rolled sheet; if the nominal thickness is not less than 3 mm, it is defined

as cold-rolled plate (except for electrical steel).

5.1.1.2.2 Cold-rolled steel strip

It refers to the product which is, after cold rolling, or through pickling,

annealing, delivered in coil.

The as-rolled strip has slightly convex edges, but may also be supplied with

sheared edges or slit from wider strip. After uncoiling and cross-cutting, the

cold-rolled strip can be delivered as a sizing or sheet.

Cold-rolled strip is further divided into.

a) Cold-rolled wide strip. the nominal width is not less than 600 mm;

b) Cold-rolled slit wide strip. after rolling, the nominal width is not less than

5.1.2 Electrical steel

compounds of vanadium or titanium or both; BUT these surface treatment

shall not alter the definition of such products as hot-dipped zinc-coated flat

products.

5.1.4.1.1.2 Aluminum-zinc coated sheet and strip

It refers to the hot-dipped metal sheet and strip which is coated with

aluminum and zinc. The total coating mass is usually 80 g/m2 ~ 450 g/m2,

AND based on the aluminum content, it is divided into.

- Aluminum zinc alloy...

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