Standard for Alloy Structural Steel Plates, Wires, Tubes and Forging Parts
This Standard defines relevant classification of alloy structural steel plates, wires, tubes and forging parts (hereinafter referred to as “structural steel”). The sizes and shapes of products are subject to the size and shape requirements of this Standard. This Standard does not apply to semi-finished products of special requirements such as plate specimen for mechanical properties, steel plate for underwater anti-corrosion, wear-resistant steel plate, etc.
1.1 Terms, definitions and symbols
1.1.1 Term
The terms and definitions related to alloy structural steel are as follows:
(1) Structural steel: Refers to alloy structural steel plates, wires, tubes and forgings.
(2) Steel plate: refers to hot-rolled and cold-rolled flat rolled steel produced by continuous casting or semi-continuous casting of steel ribbons produced by perforation and equal-width rolling slabs.
(3) Wire: refers to hot-rolled and cold-drawn wires made of alloy structural steels by continuous casting or… semi-continuous casting, hot-rolled or cold-drawn wires of non-coated steel made of steel rods made by perforation or sectioning.
(4) Tube: refers to hot-formed or cold-drawn seamless steel pipes, welded steel pipes, galvanized steel pipes or double-sided galvanized welded steel pipes, and galvanizing and copper-plating dual-purpose steel pipes produced by cold-drawing or cold-forming of steel ribbons produced by perforation and equal-width rolling slabs.
(5) Forging: Refers to products forged by alloy structural steel slabs, hot-rolled bars, cold-drawn bars and hot-drawn bars.
(6) Steel slab: refers to an alloy structural steel semis with a thickness of more than or equal to 6mm and a width of more than or equal to 600mm, which has been subjected to hot-rolling or hot-forming, but has not been subjected to cold-
rolling.
(7) Hot-rolled bar: refers to a hot-rolled bar with a cross-sectional area of 600mm2 or less and a length of no more than 12m produced by hot rolling of a slab or bloom.
(8) Cold-drawn bar: refers to alloy structural steel bars produced by cold-drawing of hot-rolled bars.
(9) Hot-drawn bar: refers to alloy structural steel bars produced by hot-drawing of steel slabs.
1.1.2 Symbol
The symbols related to this function are as follows:
(1) Fy:Yield strength, fy: Tensile strength; w :elongation rate
(2) q :impact absorption energy, v :impact absorption energy:
1.2 Grades, product categories and technical conditions
1.2.1 Grades
The grades of alloy structural steel products covered by this Standard are shown in Table 1.
Table 1 Grades of alloy structural steel plates, wires, tubes and forgings
1.2.2 Product categories
The product categories of alloy structural steel products covered by this Standard shall comply with the provisions of GB/T 222 and Table 2.
Table 2 Product categories of alloy structural steel plates, wires, tubes and forgings
1.2.3 Technical conditions
The technical conditions of alloy structural steel products covered by this Standard shall comply with the provisions of GB/T 222 and Table 3.
Table 3 Technical conditions of alloy structural steel plates, wires, tubes and forgings
