GB/T 46214-2025Hot-rolled H section steel for bridge steel structure (English PDF)

1 Scope

This document specifies the method for designation of grades, order contents, manufacturing process, technical requirements, inspection rules, packaging, marking and quality certificate for hot-rolled H section steel for bridge steel structure, and describes the corresponding test methods.

This document is applicable to the hot-rolled H section steel for bridge steel structure (hereinafter referred to as the “section steel”) with a nominal flange thickness not exceeding 80 mm. Hot-rolled section steels such as angles, channels, and I-beams for bridge steel structure shall refer to this document.

2 Normative References

GB/T 222

GB/T 223.5

GB/T 223.11

GB/T 223.14

GB/T 223.19

GB/T 223.23

GB/T 223.26

GB/T 223.37

GB/T 223.40

GB/T 223.59

GB/T 223.63

GB/T 223.78

GB/T 223.81

GB/T 223.82

GB/T 223.84

GB/T 223.85

GB/T 223.86

GB/T 228.1

GB/T 229

GB/T 232

GB/T 2101

GB/T 2975

GB/T 4336

GB/T 8170

GB/T 20066

GB/T 20123

GB/T 20124

GB/T 20125

GB/T 41749

3 Terms and Definitions

The following terms and definitions are applicable to this document.

4 Method for Designation of Grades

4.1 The steel grade designation consists of four parts. the capital letter “Q” (representing the initial letter of the Pinyin spelling for “Qu”—meaning “yield strength”); the specified minimum lower yield strength value; the lowercase letter “q” (representing the initial letter of the Pinyin spelling for “Qiao”—meaning “bridge”); and the quality grade symbol (C, D, or E).

NOTE 1.The combination of “Q” + specified minimum lower yield strength value + “q” is collectively referred to as the “steel grade”. Example 1.Q345qD. Where.

Q -- Represents the capitalized initial letter of the Pinyin spelling for “Qu”—meaning “yield strength”;

345 -- Specified minimum lower yield strength value, in megapascals (MPa);

q -- The lowercase initial letter of the Pinyin spelling for “Qiao”—meaning “bridge”, denoting steel for bridge construction; D -- Quality grade D.

For bridge steel possessing weathering resistance properties, the designation “NH” (weathering-resistant) shall be appended to the specified grade.

NOTE 2.The combination of “Q” + specified minimum lower yield strength value + “q” + “NH” is collectively referred to as the steel grade. Example 2.Q345qDNH.

NH -- The initial letters of the Pinyin spelling for “Naihou”—meaning “weathering-resistant”.

5 Order Contents

Contracts for orders placed in accordance with this document shall include, at a minimum, the following details.

a) Product name;

b) Number of this document;

c) Grade and quality grade;

d) Specification;

e) Delivery length;

f) Weight and quantity;

g) Delivery condition;

h) Other special requirements put forward by the demander, such as. special specification requirements, special surface quality requirements, etc.

6 Manufacturing Process

7 Technical Requirements