GB/T 24587-2025Hot-rolled wire rods for prestressing steel bars of concrete (English PDF)

Foreword

This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents.

This Document replaced GB/T 24587-2009 Hot-Rolled Wire Rods for Prestressing Steel Bars of Concrete, and GB/T 28899-2012 Wire Rods for Cold Rolled Ribbed Steel Bars. This document is mainly based on GB/T 24587-2009, integrating the contents of GB/T 28899-2012.

Compared with GB/T 24587-2009, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications.

— Add terms and definitions (see Clause 3 of this Edition).

— Change the requirements for smelting method (see 5.1 of this Edition; 5.2 of the 2009 Edition).

— Change the description of delivery condition (see 5.2 of this Edition; 5.3 of the 2009 Edition).

— Change the dimensions, shape, weight, and specified range of permissible deviation for wire rod, which shall conform to the requirements of Grade B and above in GB/T 14981- 2009 (see 6.7 of this Edition; 4.1 of the 2009 Edition).

— The upper limit of S content for 35Si2Cr and 40Si2Mn is adjusted from 0.025% to 0.020%. Delete Designations 48Si2Mn and 45Si2Cr; and add Designation 35SiMn (see Table 1 of this Edition; Table 1 of the 2009 Edition).

— Add analytical requirements for the residual contents of tungsten, vanadium, and titanium in steel (see Table 1 of this Edition).

— Add the designation and chemical composition of wire rod for rebar (see 6.1.2, Table 2 of this Edition).

— Change the requirements for mechanical and technological properties (see 6.2 of this Edition; 5.4 of the 2009 Edition); and add mechanical properties (see Table 3 of this Edition).

— Add requirements for macrostructure (see 6.4 of this Edition).

— Add requirements for non-metallic inclusions (see 6.5 of this Edition).

— Add requirements for aging time (see 6.8).

— Change the inspection items, sampling quantity, sampling method, and test methods;

adjust the test method of chemical composition; add bending inspection items and the sampling quantity of wire rod for rebar (see Table 6 of this Edition; Table 1 of the 2009 Hot-Rolled Wire Rods for Prestressing Steel Bars of Concrete

1 Scope

This Document specifies the ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate for hot-rolled wire rods for prestressing steel bars of concrete.

This Document applies to hot-rolled wire rods for prestressing steel bars of concrete (hereinafter referred to as wire rods for steel bars) and wire rods for cold-rolled ribbed steel bars (hereinafter referred to as wire rods for rebars).

2 Normative References

GB/T 222

GB/T 223

GB/T 224

GB/T 226

GB/T 228.1

GB/T 232

GB/T 1979

GB/T 2101

GB/T 2975

GB/T 4336

GB/T 10561

GB/T 13298

GB/T 14981-2009

GB/T 20066

GB/T 20123

3 Terms and Definitions

For the purposes of this Document, the following terms and definitions apply.

4 Ordering Contents

Contracts or orders placed according to this Document shall include the following.

a) This Document number;

b) Product name;

c) Designation;

d) Specifications;

e) Dimensional accuracy level;

f) Weight (or quantity);

g) Delivery condition;

h) Other special requirements.

5 Manufacturing Process

6 Technical Requirements