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

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GB/T 37618-2019: Nitriding steels
GB/T 37618-2019
NATIONAL STANDARD OF THE
PEOPLE’S 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’s 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 (ǀ) 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...