GB/T 34484.2-2018Heat-treatable steels -- Part 2: Alloy steels for quenching and tempering (English PDF)

Foreword

GB/T 34484 "Heat-treatable steel" is divided into two parts.

- Part 1.Non-alloy steel;

- Part 2.Alloy steels for quenching and tempering.

This Part is Part 2 of GB/T 34484.

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

This Part uses the redrafting method, to modify and adopt ISO 683-2.2016 "Heat-

treatable steels, alloy steels and free-cutting steels - Part 2.Alloy steels for quenching

and tempering".

Compared with ISO 683-2.2016, this Part has structural adjustments. Appendix A lists

the comparison of chapter and article numbers between this Part and ISO 683-2.2016.

There are technical differences between this Part and ISO 683-2.2016.The clauses

involved in these differences have been marked by a vertical single line (丨) in the outer

margin position. Appendix B gives a list of corresponding technical differences and

their reasons.

For ease of use, this Part has made the following editorial changes.

- CHANGE the standard name from "Heat-treatable steels, alloy steels and free-

cutting steels - Part 2.Alloy steels for quenching and tempering" to "Heat-treatable

steels - Part 2.Alloy steels for quenching and tempering";

- DELETE the informative Appendix D and references in ISO 683-2.2016.

This Part was proposed by the China Iron and Steel Association.

This Part shall be under the jurisdiction of the National Technical Committee for Steel

Standardization (SAC/TC 183).

Drafting organizations of this Part. Daye Special Steel Co., Ltd., Metallurgical Industry

Information Standards Research Institute, Jiangyin Xingcheng Special Steel Co., Ltd.,

Xiwang Special Steel Co., Ltd.

1 Scope

This Part of GB/T 34484 specifies the ordering content, size, shape, weight, technical

requirements, test methods, inspection rules, packaging, marking, quality certificate of

alloy steels delivered in quenched and tempered state.

This Part applies to rolled round steel which has a nominal diameter not exceeding 310

mm and rolled square steel which has a nominal side length not exceeding 280 mm

(hereinafter referred to as steel).

2 Normative references

The following documents are essential to the application of this document. For the dated

documents, only the versions with the dates indicated are applicable to this document;

for the undated documents, only the latest version (including all the amendments) is

applicable to this standard.

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

GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrome

azurol S photometric method

GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual

titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937.1986,

MOD)

GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The

ammonium ferrous sulfate titration method for the determination of vanadium

content

GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyryl

methane spectrophotometry for the determination of titanium content

GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The

dimethylglyoxime spectrophotometric method

GB/T 223.26 Iron, steel and alloy - Determination of molybdenum content - The

thiocyanate spectrophotometric method

GB/T 6394 Determination of estimating the average grain size of metal

GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions -

Micrographic method using standards diagrams (ISO 4967.1998, IDT)

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

(GB/T 17505-2016, ISO 404.2013, MOD)

GB/T 20066 Steel and iron - Sampling and preparation of samples for the

determination of chemical composition (GB/T 20066-2006, ISO 14284.1996, IDT)

GB/T 20123 Steel and iron - Determination of total carbon and sulfur content

Infrared absorption method after combustion in an induction furnace (routine

method)

3 Ordering content

The contract or order for ordering according to this Part shall include the following

content.

a) This Part number;

b) Product name;

c) Designation;

d) Smelting method (see 5.2);

e) Surface hardness (see 5.4);

f) Grain size (see 5.7);

g) Ultrasonic testing (see 5.8);

h) Remanence (see 5.9);

i) Weight (or quantity);

j) Dimensions and shape (see Chapter 4);

k) Special requirements.

4 Dimensions, shape, weight

7 Inspection rules

8 Packaging, marking, quality certificate

The packaging, marking, quality certificate of steel products shall comply with the

relevant provisions of GB/T 2101.

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