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GB/T 35840.4-2020 (GBT 35840.4-2020)

Chinese Standard: 'GB/T 35840.4-2020'
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GB/T 35840.4-2020English110 Add to Cart 0--10 minutes. Auto-delivered. Steels for plastic mould -- Part 4: Pre-hardening steel plate GB/T 35840.4-2020 Valid GB/T 35840.4-2020
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BASIC DATA
Standard ID GB/T 35840.4-2020 (GB/T35840.4-2020)
Description (Translated English) Steels for plastic mould--Part 4: Pre-hardening steel plate
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H46
Classification of International Standard 77.140.35
Word Count Estimation 10,131
Date of Issue 2020-03-06
Date of Implementation 2020-10-01
Drafting Organization Jiangyin Xingcheng Special Iron and Steel Co., Ltd., Jiangsu Shagang Group Co., Ltd., Panyou Group Jiangyou Great Wall Special Steel Co., Ltd., Xinyu Iron and Steel Co., Ltd., Metallurgical Industry Information Standard Research Institute
Administrative Organization National Steel Standardization Technical Committee (SAC / TC 183)
Regulation (derived from) National Standards Bulletin No. 1 of 2020
Proposing organization China Iron and Steel Industry Association
Issuing agency(ies) State Administration of Market Supervision and Administration, National Standardization Administration

GB/T 35840.4-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.35
H 46
Steels for Plastic Mould - Part 4: Pre-hardening Steel
Plate
塑料模具钢 第 4部分: 预硬化钢板
ISSUED ON: MARCH 6, 2020
IMPLEMENTED ON: OCTOBER 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 Terms and Definitions ... 6 
4 Order Content ... 6 
5 Dimension, Shape and Weight ... 6 
6 Technical Requirements ... 7 
7 Test Methods ... 10 
8 Inspection Rules ... 10 
9 Packaging, Marking and Quality Certificate ... 11 
Steels for Plastic Mould - Part 4: Pre-hardening Steel
Plate
1 Scope
This Part of GB/T 35840 specifies the terms and definitions, order content, dimension,
shape, weight, technical requirements, test methods, inspection rules, packaging,
marking and quality certificate of pre-hardening steel plates for plastic mould.
This Part is applicable to pre-hardening steel plates with a thickness of 10 mm ~ 300
mm for the manufacture of plastic moulds (hereinafter referred to as steel plates).
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 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 223.14 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 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Thiosulfate Separation Iodimetric 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 223.25 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Dimethylglyoxime Gravimetric Method for the Determination of Nickel Content
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate 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 Phosphorous Content - Bismuth
Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
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 224 Determination of Depth of Decarburization of Steels
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method (scales
A, B, C, D, E, F, G, H, K, N, T)
GB/T 247 General Rule of Acceptance, Package, Mark and Certification for Steel
Plates (sheets) and Strips
GB/T 709-2019 Dimension, Shape, Weight and Tolerance for Hot-rolled Steel Strip,
Plate and Sheet
GB/T 2970-2016 Method for Ultrasonic Testing of Thicker Steel Plates
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 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams
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
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Pre-hardening
Pre-hardening means to make mould steel reach a specific hardness state through the
method of thermal treatment before the mould is manufactured.
4 Order Content
The contract or order form that orders in accordance with this Part shall include the
following content:
a) Serial No. of this Part;
b) Product name;
c) Designation (see 6.1);
d) Specification;
e) Weight (or quantity);
f) Dimension and shape accuracy;
g) Group of delivery hardness (see 6.4; when it is not indicated, it is Level-L);
h) Special requirements (see 6.8).
5 Dimension, Shape and Weight
5.1 The dimension, shape, weight and tolerance of steel plates shall comply with the
stipulations of GB/T 709-2019. The allowable deviation of thickness shall comply with
Type-C stipulations in GB/T 709-2019.
Related standard: GB/T 35840.1-2018    GB/T 35840.2-2018
Related PDF sample: GB/T 35841-2018    GB/T 36130-2018