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GB/T 38809-2020General specification for low alloy ultra-high strength steels (English PDF)

低合金超高强度钢通用技术条件

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

June 2, 2020

Implementation date

January 1, 2021

Scope

GB/T 38809-2020 is the English-translated version of 低合金超高强度钢通用技术条件.

GB/T 38809-2020 is the Chinese standard "General Specification for Low Alloy Ultra-high Strength Steels". Its scope clause reads: This Standard specifies the order content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of low alloy ultra-high strength steels.

This Standard is applicable to rolled or forged low alloy ultra-high strength steel bars (hereinafter referred to as steel bars). The designation and chemical composition specified in this Standard are also applicable to steel ingots, billets or their products.

Its clauses include order content; dimensions, shape and weight; technical requirements; test methods; inspection rules; packaging, marking and quality certificate.

It was issued by the State Administration for Market Regulation on JUNE 2, 2020 and took effect on DECEMBER 1, 2020.

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Document preview — GB/T 38809-2020

National Standard of the People's Republic of China

ICS: 77.140.20
Classification: H 40

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative References4
3 Order Content6
4 Dimensions, Shape and Weight7
5 Technical Requirements7
6 Test Methods17
7 Inspection Rules18
8 Packaging, Marking and Quality Certificate19
Appendix A (informative) A Comparison Table of Steel Designation and Code20
Appendix B (normative) Magnetic Particle Inspection Method21

1 Scope

This Standard specifies the order content, dimensions, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of low alloy ultra-high strength steels.

This Standard is applicable to rolled or forged low alloy ultra-high strength steel bars (hereinafter referred to as steel bars).

The designation and chemical composition specified in this Standard are also applicable to steel ingots, billets or their products.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products

GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method

GB/T 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Photometric Method 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 223.43 Iron, Steel and Alloy - Determination of Tungsten Content - Gravimetric Method and Spectrophotometric Method

GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content

GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content

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 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - The Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content

GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace

GB/T 223.72 Iron, Steel and Alloy - Determination of Sulfur Content - Gravimetric Method

GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrometric Method for the Determination of Vanadium Content

GB/T 224 Determination of Depth of Decarburization of Steels

GB/T 226 Test Method for Macrostructure and Defect of Steel by Etching

GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature

GB/T 229 Metallic Materials - Charpy Notch Impact Test

GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method

GB/T 702 Hot-rolled Steel Bars - Dimensions, Shape, Weight and Tolerances

GB/T 908 Forged Bars - Dimensions, Shape, Weight and Tolerances

GB/T 2101 General Requirement of Acceptance, Packaging, Marking and Certification for Section Steel

GB/T 2975 Steel and Steel Products - Location and Preparation of Samples and Test Pieces for Mechanical Testing

GB/T 4161 Metallic Materials - Determination of Plane-strain Fracture Toughness

GB/T 4162-2008 Forged and Rolled Steel Bars - Method for Ultrasonic Testing

GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy Steel (routine method)

GB/T 6394 Determination of Estimating the Average Grain Size of Metal

GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement of Limiting Values

GB/T 10121 Steel Products - Method for Magnetic Particle Inspection of Tower Sample

GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams

GB/T 13298 Inspection Methods of Microstructure for Metals

GB/T 13299 Steel - Determination of Microstructure

GB/T 15711 Inspection of Non-metallic Inclusions of Steel - Etching Test Method of Tower Samples

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 method)

GB/T 36026-2018 High-strength Corrosion-resistant Alloy Bars for Oil and Gas Engineering

GB/T 37566 Method of Ultrasonic Testing for Round Steel

YB/T 5293 Metallic Materials - Forging Test

3 Order Content

The contract or order form that orders in accordance with this Standard shall at least include the following content:

a) Serial No. of this Standard;

b) Product name;

c) Designation;

d) Specifications and precisions (see Chapter 4);

e) Weight;

f) Smelting method (see 5.2);

g) Delivery state (see 5.3);

Appendix B (normative) Magnetic Particle Inspection Method

B.1 Overview

The method specified in this Appendix is merely limited to non-metallic inclusion magnetic particle inspection. During the inspection process, if real fractures are found, such as: cracks, fissures, delamination and folds, then, the steel shall be scrapped, unless these defects are caused by sample preparation.

B.2 Sample Preparation for Magnetic Particle Inspection

B.2.1 In terms of steel bars whose nominal diameter is not less than 300 mm, samples may be prepared in accordance with one of the following methods:

a) From each sample billet, cut a 1/4 section (sufficient margin should be retained) to forge into sample blank with a diameter of 75 mm ~ 150 mm.

Make the center of the sample billet roughly on the surface of the sample blank; maintain the axis of the sample blank approximately parallel to the axis of the original bar;

b) Forge the entire section of the steel bar into a round bar with a diameter of 150 mm, then, in accordance with B.2.2, prepare the samples.

B.2.2 In terms of steel bars whose nominal diameter is greater than 150 mm and less than 300 mm, from each sample billet, cut a 1/4 section (sufficient margin should be retained). Through machining or forging, make a sample blank with a diameter of 75 mm ~ 150 mm. In addition, make the center of the sample billet roughly on the surface of the sample blank. Then, process the sample blank into a cylindrical sample with a length of 125 mm. The minimum cutting amount of the sample blank shall comply with the stipulations of B.2.4.

B.2.3 In terms of steel bars whose nominal diameter is not greater than 150 mm, samples may be prepared in accordance with one of the following methods:

a) From each sample billet, cut a 1/4 section (sufficient margin should be retained). Through machining, make a cylindrical sample with a length of 125 mm. In addition, make the center of the sample billet roughly on the surface of the sample. The minimum cutting amount of the sample blank shall comply with the stipulations of B.2.4;

b) Forge the entire section of the steel bar into tower-shaped samples with an equal length. The dimensions of the tower-shaped samples are shown in […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 223.53 · GB/T 223.58

Similar standards

GB/T 25932-2025|GB/T 20878-2024|GB/T 24170.1-2023|GB/T 28417-2023|GB/T 24181-2022|GB/T 40341-2021

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