This part of GB/T 35840 specifies the order contents, dimensions, shapes, weights, technical requirements, test methods, inspection rules, packaging, marking and certification of non-alloy steels for plastic mould.
It is applicable to hot-rolled or wrought non-alloy round steel, square steel, flat steel and steel plate (hereinafter referred to as steel) for manufacture of plastic moulds.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method
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 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content
GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method
GB/T 223.72 Iron steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
GB/T 226 Test method for macrostructure and defect of steel by etching
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips
GB/T 709 Dimension, shape, weight and tolerances for hot-rolled steel plates and sheets
GB/T 1299-2014 Tool and mould steels
GB/T 1979 Standard diagrams for macrostructure and defect of structural steels
GB/T 2101 General requirements of acceptance, packaging, marking, and certification for section steel
GB/T 2970-2016 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method)
GB/T 6402 Steel forgings- Method for ultrasonic testing
GB/T 8170 Rules of rounding off for numerical values & expression and judgment 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
GB/T 20123 Steel and iron - Determination of total carbon and sulfur content - Infrared absorption method after combustion in an induction furnace (routine method)
3 Order contents
The contract or order for the steel ordered according to this part shall include the following information:
a) a reference to this part;
b) product name;
GB/T 35840.1-2018 The following standards are cited：
