GB/T 24595-2020Hot-rolled steel bars for quenched and tempered automobile crankshafts (English PDF)

1 Scope

This Standard specifies the order content, size, shape, weight, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of hot-rolled steel bars for quenched and tempered automobile crankshafts.

This Standard applies to hot-rolled steel bars whose nominal diameter is not greater than 200 mm (hereinafter referred to as steel bars).

2 Normative references

The following documents are indispensable for the application of this document.

For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies 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 223.11, Iron, steel and alloy - Determination of chromium content -Visual titration or potentiometric titration method

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 223.26, Iron, steel and alloy - Determination of molybdenum content -The thiocyanate 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 11261, Steel and iron - Determination of oxygen content - The pulse heating inert gas fusion-infra-red absorption 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 34474.1-2017, Determination of banded structure of steel - Part 1:

Micrographic method using standards diagrams

3 Order content

Contracts or orders which are ordered under this Standard shall include the following contents:

a) number of this Standard;

b) product name:

c) designation;

d) specifications;

e) weight (quantity);

f) delivery status;

g) other special requirements;

4 Size, shape, weight