GB/T 33975-2017Hot-rolled spring steel wire rod for high-speed railway fastener (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This Standard specifies the ordering content, dimension, shape, weight and tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certification of hot-rolled spring steel wire rod for high-speed railway fastener, This Standard applies to hot-rolled spring steel wire rod for high-speed railway fastener with a nominal diameter of 12 mm ~ 20 mm (hereinafter referred to as steel wire rod).

This standard can be used as a reference for ordinary railways and heavy-load railways.

2 Normative references

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

GB/T 222, Permissible tolerances for chemical composition of steel products

GB/T 223.5, Steel and iron -- Determination of acid-soluble silicon and total silicon content -- Reduced molybdosilicate spectrophotometric method

GB/T 223.11, Iron, steel and alloy -- Determination of chromium content -- Visual titration or potentiometric titration method

GB/T 223.12, Methods for chemical analysis of iron, steel and alloy -- The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content

GB/T 223.14, Methods for chemical analysis of iron, steel and alloy -- The n-benzoy-n-phenylhydroxylamine extraction photometric method for the determination of vanadium content

GB/T 223.19, Methods for chemical analysis of iron steel and alloy -- The neocuproine-chloroform extraction photometric method for the determination of copper content

GB/T 14981-2009, Dimension, shape, mass and tolerance for hot-rolled round wire rod

GB/T 17505, Steel and steel products -- General technical delivery requirements

GB/T 20066, Steel and iron-sampling and preparation of samples for the determination of chemical composition

YB/T 081, Rule for rounding off of numerical values and judgement of testing values for technical standards of metallurgy

3 Ordering content

Contracts or orders based on this Standard shall include the following content.

a) a reference to this Standard;

b) product name;

c) steel designation;

d) product specification and weight;

e) dimension, shape and accuracy grade;

f) other special requirements.

4 Dimension, shape, weight and tolerances

4.1 The dimension, shape and tolerances of steel wire rod shall meet accuracy grade C of GB/T 14981-2009. Other dimensional accuracy can also be delivered as agreed on by the purchaser and the supplier.

4.2 The coil weight of steel wire rod shall be as specified in GB/T 14981-2009.

5 Technical requirements