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ISO 9477 1992 High strength cast steels for general engineering and structural purposes

This international standard specified requirements for four grades of heat-treated cast carbon and alloy steels for general engineering and structural purposes. They are grade 410-620, 540-720, 620-820 and 840-1030.

The four steel grades are intended for service at ambient temperature. However, properties at other temperatures may be agreed on through the use of the supplementary requirements in ISO 4990.

Mechanical Properties

Steel used for castings shall conform to the mechanical property requirements given in the following table.

Either the reduction of the area or the impact strength shall be determined, and this shall conform to the requirements specified for the grade in table 1. The choice of test will be at the discretion of the manufacturer, unless specified by the purchaser at the time of ordering. 

Grade

specimen/mm

Mechanical Property

σs /MPa

σb /MPa

δ ≥ (%)

φ ≥(%)

A KV / J

410-620

28

410

620~770

16

40

20

540-720

28

540

720~870

14

35

20

620-820

28

620

820~970

11

30

18

840-1030

28

840

1030~1180

7

22

15

 

Chemical Requirements 

The maximum contents of silicon, sulfur and phosphorus shall be 0.60%, 0.035% and 0.035% respectively.  

Grade

Si

P

S

Other

410-620

≤ 0.60

≤ 0.035

≤ 0.035

Other chemical components could be determined by buyer and seller.

540-720

≤ 0.60

≤ 0.035

≤ 0.035

620-820

≤ 0.60

≤ 0.035

≤ 0.035

840-1030

≤ 0.60

≤ 0.035

≤ 0.035

Other related standard:

ISO 3755 1991 cast carbon steels for general engineering purposes

 

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