GB/T 11251-2025Alloy structural steel plate, sheet and strip (English PDF)

1 Scope

GB/T 11251-2025 is the Chinese national standard on alloy structural steel plate, sheet and strip, in the field of metallurgy. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 31 October 2025 by the State Administration for Market Regulation; Standardization Administration of China, and has been in force since 1 May 2026. Classification: ICS 77.140.50, CCS H 46. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This document specifies the ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates for alloy structural steel plate/sheet and strip. This document applies to single-sheet hot-rolled steel plate/sheet with a nominal thickness of

3.0 mm ~ 250 mm (hereinafter referred to as single-rolled steel plate/sheet); hot-continuously-rolled steel plate/sheet and strip with a nominal thickness not greater than

25.4 mm, including hot-continuously-rolled wide steel strip, sheared steel plate/sheet, and slit steel strip with a nominal width not less than 600 mm, and hot- continuously-rolled narrow steel strip and sheared steel plate/sheet with a nominal width less than 600 mm (hereinafter referred to as steel plate/sheet and strip). NOTE. Single-rolled steel plate/sheet, steel plate/sheet and strip are collectively referred to as steel products in this document.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 222 Steels and alloys - Permissible deviations of product analyzed chemical composition

GB/T 223 (all parts) Methods for chemical analysis of iron, steel and alloy

GB/T 224 Determination of the depth of decarburization of steels

GB/T 228.1 Metallic materials - Tensile testing - Part

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 709-2019 apply.

4 Ordering details

A contract or order placed according to this document shall include the following.

a) serial number of this document;

b) product name;

d) dimensions, shape, and tolerance or thickness accuracy;

e) delivery weight (or quantity);

f) delivery condition;

g) edge condition;

h) surface treatment and surface quality grade;

i) processing purpose (if for stamping, this shall be specified);

j) special requirements.

5 Manufacturing process

5.1 Smelting method Steel is smelted in a converter or electric furnace and refined outside the furnace. Unless otherwise specified by the purchaser, the smelting method shall be selected by the supplier.