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GB/T 35840.4-2020 English PDF (GBT35840.4-2020)

GB/T 35840.4-2020 English PDF (GBT35840.4-2020)

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GB/T 35840.4-2020: Steels for plastic mould -- Part 4: Pre-hardening steel plate

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.
GB/T 35840.4-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.35
H 46
Steels for Plastic Mould - Part 4: Pre-hardening Steel
Plate
ISSUED ON: MARCH 6, 2020
IMPLEMENTED ON: OCTOBER 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 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.
5.2 Through the negotiation between the demand-side and the supply-side, and statement in the contract, untrimmed steel plates may be supplied.
5.3 Generally speaking, steel plates are delivered in accordance with the actual weight. Through the agreement between the demand-side and the supply-side, steel plates may also be delivered in accordance with the theoretical weight. When they are delivered in accordance with the theoretical weight, the density of steel adopted in the theoretical weight is 7.85 kg/dm3; use the average value of the maximum and minimum allowable thickness for the thickness calculation.

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