GB/T 36708-2018Pre-Hardening High Speed Tool Steel (English PDF)

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009.

This Standard was proposed by China Iron and Steel Industry Association.

This Standard shall be under the jurisdiction of National Technical Committee for

Standardization of Steel (SAC/TC 183).

Drafting organizations of this Standard. Heye Special Steel Co., Ltd.; Yantai Better

Alloy Material Manufacturing Co., Ltd.; Shijiazhuang Jinfeng Special Steel Products

Co., Ltd.; Shanghai Tool Works Co., Ltd.; and China Metallurgical Information and

Standardization Institute.

Chief drafting staffs of this Standard. Zhang Beibei, Yao Fengchen, Wang Jianhua,

Zhu Xinfa, Dai Qiang, Yan Chengming, and Wu Lizhi.

Pre-Hardening High Speed Tool Steel

1 Scope

This Standard specifies the hardness, size, shape, technical requirements, test

methods, inspection rules, package, marking and quality certificate, etc. of the pre-

hardening high-speed tool steel bars and wires.

This Standard is applicable to the pre-hardening high-speed tool steel bars and wires

(hereinafter referred to as steel) with a diameter of 1.0mm~15.0mm, and polishing or

cold drawing surface.

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) are applicable to this document.

GB/T 223.5 Steel and Iron - Determination of Acid-Soluble Silicon and total Silicon

Content - Reduced Molybdosilicate Spectrophotometric Method

GB/T 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium

Fluoride Separation-EDTA Titration Method for the Determination of Aluminum

Content

GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual

Titration or Potentiometric Titration Method

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 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - The

Neocuproine-Chloroform Extraction Photometric Method for the Determination of

Copper Content

GB/T 223.22 Methods for Chemical Analysis of Iron, Steel and Alloy - The Nitroso-

R-Salt Spectrophotometric Method for the Determination of Cobalt 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 223.43 Iron, Steel and Alloy - Determination of Tungsten Content -

Gravimetry Method and Spectrophotometric Method

GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content -

Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony

Phosphomolybdate Blue Spectrophotometric Method

GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium

(Potassium) Periodate Photometric Method for the Determination of Manganese

Content

GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The

Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the

Determination of Sulfur Content

GB/T 223.69 Iron, Steel and Alloy-Determination of Carbon Contents- Gas-

volumetric Method after Combustion in the Pipe Furnace

GB/T 224 Determination of Depth of Decarburization of Steels

GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1. Test Method

GB/T 2101 General Requirement of Acceptance Packaging Marking and

Certification for Section Steel

GB/T 2103 General Requirements for Acceptance, Packing, Marking and Quality

Certification of Steel Wire

GB/T 4336 Carbon and Low-Alloy Steel - Determination of Multi-Element Contents

-Spark Discharge Atomic Emission Spectrometric Method (Routine Method)

GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1. Test Method

GB/T 9943 High-Speed Tool Steel

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

GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content

Infrared Absorption Method after Combustion in an Induction Furnace (Routine

Table 6 - Qualification Level of Heat-Treatment Metallurgical Structure

7 Inspection Methods

1 Chemical composition 1 piece/furnace GB/T 20066 See 7.2

2 Hardness 3 pieces/batch Ends of different steels

GB/T 230.1, GB/T

4340.1

3 Decarburization layer 3 pieces/batch Ends of different steels GB/T 224

Quenching grain size

Overheating degree

Tempering degree

3 pieces/batch Ends of different steels JB/T 9986

Main uses of steel

Steel diameter Quenching grain size a

Level

Level Level

No greater than No greater than

Overheating degree b Tempering degree c

Straight-shank drill bit

Centre drill

Tap

Push rod, punch, punch

needle, valve needle

a If the high-speed tool steel is manufactured by the powder metallurgy method, the quenching grain size shall be Level-10 or finer; when

the grain size is rated, it can abide by the S-G grain size.

b The qualification level for the overheating degree of the power metallurgy manufactured high-speed tool steel shall be Level-1 or finer.

's qualification level for

Tempering degree shall be Level-1.

......