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GB/T 37618-2019 English PDF (GBT37618-2019)

GB/T 37618-2019 English PDF (GBT37618-2019)

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GB/T 37618-2019: Nitriding steels

This Standard stipulates the classification, code, order content, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of nitriding steels. This Standard is applicable to rolled, forged and cold-drawn nitriding steel bars whose nominal diameter or thickness does not exceed 250 mm.
GB/T 37618-2019
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.10
H 40
Nitriding Steels
(ISO 683-5:2017, Heat-treatable Steels, Alloy Steels and Free-cutting
Steels - Part 5: Nitriding Steels, MOD)
ISSUED ON: JUNE 4, 2019
IMPLEMENTED ON: MAY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Classification and Code ... 7
4 Order Content ... 8
5 Dimensions, Shapes and Weights ... 8
6 Technical Requirements ... 10
7 Test Methods ... 5
8 Inspection Rules ... 6
9 Packaging, Marking and Quality Certificate ... 7
Appendix A (informative) Structural Changes of this Standard in Comparison with ISO 683-5:2017 ... 8
Appendix B (informative) Technical Differences between this Standard and ISO 683-5:2017 and Their Causes ... 9
Appendix C (informative) A Comparison between Designations in this Standard and Similar Designations in Other National Standards and Foreign Standards ... 1
Appendix D (normative) Longitudinal Mechanical Properties and Sampling
Location of Steel Bars under Quenching and Tempering Delivery State ... 3 Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009. This Standard was modified in accordance with the Law of Redrafting on the basis of ISO 683-5:2017 Heat-treatable Steels, Alloy Steels and Free-cutting Steels - Part 5: Nitriding Steels.
In comparison with ISO 683-5:2017, this Standard has structural adjustments. Appendix A lists out a table of comparison of Chapter No. between this Standard and ISO 683-5:2017.
In comparison with ISO 683-5:2017, this Standard has technical differences. Clauses that involve these differences have been marked through vertical single line (?€) in the blank of the outer margin. Appendix B provides a table of corresponding technical differences and the causes.
For ease of use, this Standard makes the following editorial modifications: ---The title of the Standard is modified from ?€?Heat-treatable Steels, Alloy Steels and Free-cutting Steels - Part 5: Nitriding Steels?€? to ?€?Nitriding Steels?€?; ---The reference part in ISO 683-5:2017 is deleted.
This Standard was proposed by China Iron and Steel Industry Association. This Standard shall be under the jurisdiction of National Technical Committee 183 on Iron and Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard: Fushun Special Steel Shares Co., Ltd.; Jiangyin XINGCHENG Special Steel Works Co., Ltd.; China Metallurgical Information and Standardization Institute.
The main drafters of this Standard: Guqiang, Liu Jinxin, Mengyu, Luanyan, Litao, Wang Xinshe, Wang Xinhe.
Nitriding Steels
1 Scope
This Standard stipulates the classification, code, order content, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of nitriding steels.
This Standard is applicable to rolled, forged and cold-drawn nitriding steel bars whose nominal diameter or thickness does not exceed 250 mm (hereinafter referred to as steel bars).
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 223.8 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium Fluoride Separation - EDTA Titration Method for the Determination of Aluminum Content
GB/T 223.9 Iron, Steel and Alloy - Determination of Aluminum 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 223.14 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 223.17 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyrylmethane Photometric Method for the Determination of Titanium 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 223.23 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 223.29 Iron, Steel and Alloy - Determination of Lead Content - Carrier Precipitation - Xylenol Orange Spectrophotometric Method
GB/T 223.31 Iron, Steel and Alloy - Determination of Arsenic Content - Distillation - Molybdenum Blue Spectrophotometric Method (GB/T 223.31-2008, ISO 17058:2004, IDT)
GB/T 223.43 Iron, Steel and Alloy - Determination of Tungsten Content - Gravimetric Method and Spectrophotometric Method
GB/T 223.47 Methods for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation - Molybdenum Blue Photometric Method for the Determination of Antimony Content
GB/T 223.48 Methods for Chemical Analysis of Iron, Steel and Alloy - The Semi-xylenol Orange Photometric Method for the Determination of Bismuth Content
GB/T 223.49 Methods for Chemical Analysis of Iron, Steel and Alloy - Extraction Separation - Chlorophosphonazo mA Spectrophotometric Method for the
Determination of the Total Rare Earth Content
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy - The Phenylfluorone - CTMAB Direct Photometric Method for the Determination of Tin 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 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method (GB/T 223.64-2008, ISO 10700:1994, IDT) GB/T 223.67 Iron, Steel and Alloy - Determination of Sulfur Content - Methylene Blue Spectrophotometric Method (GB/T 223.67-2008, ISO 10701:1994, IDT)
GB/T 223.82 Steel and Iron - Determination of Hydrogen Content - Thermal Conductivity / Infrared Method after Fusion under Inert Gas
GB/T 224 Determination of Depth of Decarburization of Steels (GB/T 224-2008, ISO 3887:203, MOD)
GB/T 225 Steel - Hardenability Test by End Quenching (Jominy Test) (GB/T 225-2006, ISO 642:1999, IDT)
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 228.1-2010, ISO 6892-1:2009, MOD)
GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method (GB/T 229-2007, ISO 148-1:2006, MOD)
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method (GB/T 231.1-2018, ISO 6506-1:2014, MOD)
GB/T 702-2017 Hot-rolled Steel Bars - Dimensions, Shape, Weight and Tolerances GB/T 905-1994 Dimension, Shape, Weight and Tolerance for Cold-drawn Round, Square and Hexagonal Steels
GB/T 908-2019 Forged Bars for Dimensions, Shape, Weight and Tolerances
GB/T 1979 Standard Diagrams for Macrostructure and Defect of Structural Steels GB/T 2101 General Requirement of Acceptance, Packaging, Marking and Certification for Section Steel
GB/T 2975-2018 Steel and Steel Products - Location and Preparation of Samples and Test Pieces for Mechanical Testing (ISO 377:2017, MOD)
GB/T 3078 Quality Structural Steel Cold Drawn Bars
GB/T 3207-2008 Bright Steel
GB/T 4162 Forged and Rolled Steel Bars - Method for Ultrasonic Testing
GB/T 4336 Carbon and Low-alloy Steel - Determination of Multi-element Contents - Spark Discharge Atomic Emission Spectrometric Method (routine method)
GB/T 6394 Determination of Estimating the Average Grain Size of Metal
GB/T 6402 Steel Forgings - Method for Ultrasonic Testing
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement of Limiting Values
GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams (ISO 4967:1998, IDT)
GB/T 11261 Steel and Iron - Determination of Oxygen Content - The Pulse Heating Inert Gas Fusion - Infrared Absorption Method
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 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) (GB/T 20123-2006, ISO 15350:2000, IDT)
GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal Conductimetric Method after Fusion in a Current of Inert Gas (routine method) (GB/T 20124-2006, ISO 15351:1999, IDT)
GB/T 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method
GB/T 21834 Medium and Low Alloy Steel - Determination of the Distribution of Multi- element Contents - Original Position Statistic Distribution Analysis Method GB/T 28300 Surface Quality Classes for Hot-rolled Bars and Rods Technical Delivery Conditions
YB/T 5293 Metallic Materials - Forging Test
3 Classification and Code
3.1 In accordance with metallurgical quality, steel bars shall be classified into the following three types:
a) Quality steel;
b) Advanced quality steel (add ?€?A?€? after designation);
c) Extraordinary quality steel (add ?€?E?€? after designation).
3.2 In accordance with processing purposes, steel bars shall be classified into the following two types:
a) Steel for pressure processing UP:

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