GB/T 35840.4-2020Steels for plastic mould—Part 4: Pre-hardenging steel plate (English PDF)

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.

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. […]