GB/T 24242.2-2020Non-alloy steel wire rod for conversion to wire - Part 2: Specific requirements for general purpose wire rod (English PDF)

3.1 The designation of wire rod steel is usually expressed by chemical composition,

and the designation code is CXXD. It is composed of two parts: the English initials of

Carbon and Drawing, and the Arabic numerals of the average content of carbon

element (in a few ten thousandths).

Example: C70D.

In which: 70---the average content of carbon element is 70 parts per 10,000;

C, D---respectively the English initials of Carbon and Drawing.

3.2 For the designations C26D ~ C92D, in accordance with the demands of the

demand-side, when the designation of wire rod steel is expressed by chemical

composition, the designation code may also be expressed as CXXDA or CXXDB, in

which, A represents Type-A steel, whose manganese content is 0.30% ~ 0.60%; B

represents Type-B steel, whose manganese content is 0.60% ~ 0.90%.

3.3 If the wire rod products in Appendix C are provided, then, the designation shall be

named after tensile strength, and the code is TXXXX. It is composed of two parts: the

English initial of tensile strength and the median value of the tensile strength range.

Example: T1000.

In which: T---the English initial of the first word of tensile strength;

1,000---the median value of the tensile strength range.

4.1 General Requirements

The dimensions, shapes, weights and allowable deviations, order content, smelting

method, delivery state, surface state, test methods, inspection rules, packaging,

marking and quality certificate of wire rod shall comply with the stipulations of GB/T

24242.1-2020.

4.2 Designations and Chemical Compositions

4.2.1 In terms of wire rod named after its chemical composition, the designation and

chemical composition (melting analysis) shall comply with the stipulations of Table 1.

4.2.2 In terms of wire rod named after its tensile strength, the designation and the

chemical composition (melting analysis) of the main elements shall comply with the

stipulations of Appendix C.

4.2.3 The allowable deviations of the chemical composition analysis of wire rod shall

comply with the stipulations of GB/T 222.

4.2.4 Apart from the elements required for smelting, the elements not listed in Table 1

shall not be intentionally added to steel without the consent of the demand-side. During

ordering, through the negotiation between the demand-side and the supply-side,

commonly used microalloying elements, such as: Cr and V, may be added. The content

of Cr shall be not greater than 0.3%; the content of V shall be not greater than 0.10%.

4.2.5 Through the agreement between the demand-side and the supply-side, on the

basis of Table 1, the content of C of the designations C26D ~ C92D may be increased

by 0.01% in the upper limit or be decreased by 0.01% in the lower limit.

4.2.6 For wire rod used for galvanizing, if the demand-side requires the lower limit of

......