GB/T 32570-2016steel plates and strips for freight containers (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This Standard specifies the grade representation, order contents, dimension, shape, weight, tolerance, technical requirements, test methods, inspection rules, packaging, symbols and quality certificate of the steel plates and strips for freight containers.

This Standard is applicable to the hot-rolled steel plates and strips for freight containers with the thicknesses of 1.0mm to 16.0mm, and the cold-rolled steel plates and strips for freight containers with the thicknesses of 1.0mm to 2.5mm.

The steel plates and strips are mainly used for manufacturing the freight containers, and can also be used for manufacturing the camp rooms, transport vehicles, etc.

2 Normative references

The following documents are essential to the application of this document. For dated references, only the editions with the dates indicated are applicable to this document. For undated references, only the latest editions (including all the amendments) are applicable to this document.

GB/T 222 Permissible tolerances for chemical composition of steel products

GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content

GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method

GB/T 223.9 Iron, steel and alloy - Determination of aluminium content - Chrom azurol S photometric method

GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method

GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content

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 223.16 Methods for chemical analysis of iron, steel and alloy - The chromotropic acid 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 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric method for the determination of nitrogen content after distillation separation

GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method

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 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content

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 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium (potassium) periodate photometric method for the determination of manganese content

GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method

GB/T 223.67 Iron, steel and alloy - Determination of sulfur content - Methylene blue spectrophotometric method

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)

GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas (routine method)

GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method

3 Grade representation

3.1 The grades of hot-rolled steel plates and strips shall be composed of four parts. the first letter "Q" of the Chinese phonetic alphabet of the Chinese character "" representing the yield strength; the first letters "NH" and "J" of the Chinese phonetic alphabets of the Chinese characters "" and ""; the lower limit of the yield strength; and the quality grade of steel.

Example 1. Q550NHJE Q - The first letter of the Chinese phonetic alphabet of the Chinese character "" representing the yield strength;

550 - Specified minimum value of the yield strength, in unit of Megapascal (MPa);

NHJ - The first letters of the Chinese phonetic alphabets of the Chinese characters "" and "" respectively representing the weathering steels and freight containers; E - Quality grade E.

Example 2. Q700JE Q - The first letter of the Chinese phonetic alphabet of the Chinese character "" representing the yield strength;

700 - Specified minimum value of the yield strength, in unit of Megapascal (MPa);

J - The first letter of the Chinese phonetic alphabet of the Chinese character "" representing the freight containers;

E - Quality grade E. b According to the agreement reached between both sides, for the product with the thickness of less than 3.0mm, the lower limit of the tensile strength can be 510MPa; c If the specimen thickness is greater than 8mm, the minimum yield strength is allowed to decrease by 20MPa; d a refers to the specimen thickness; b refers to the specimen width.

Impact Energy Absorption of Hot-rolled Steel Plates and Strips Quality grade Charpy (v-notch) impact test a Specimen direction Temperature / °C Impact energy absorption (KV2) / J No less than Longitudinal -20 -40 a The impact specimen dimensions shall be 10mm × 10mm × 55mm.

6 Technical requirements

6.4.2 Charpy (v-notch) impact energy absorption shall be calculated in accordance with the arithmetic mean value of three specimen values. One of the specimen values is allowed to be less than the specified value in Table 6, but shall not be less than 70% of the specified value.

6.4.3 For the steel plates with the thicknesses of less than 12mm, Charpy (v-notch) impact test shall use auxiliary specimens. For the steel plates with the thicknesses of greater than 8mm and less than 12mm, the auxiliary specimen dimensions shall be 10mm × 7.5mm × 55mm. The test results shall not be less than 75% of the specified value in Table 6. […]