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GOST 7293 - Spheroidal Graphite Cast Iron, SG Iron

GOST 7293 is a Russian standard for SG cast iron (also called as ductile iron). This specification has stipulated the mechanical properties, elongation and hardness range of SG iron, and issue a recommended chemical composition.

This standard has been widely used for iron parts designers, buyers and iron casting manufacturers. The following is the main content of this standard.

Mechanical Properties of SG Cast Iron

Cast Iron Grade (ВЧ, Vc, VCh) Tensile Strength (Mpa) Yield Strength (Mpa)
35 350 220
40 400 250
50 450 310
60 500 320
70 600 370
80 700 420
100 800 480
  1000 700

Elongation and Hardness of SG Cast Iron

Cast Iron Grade (ВЧ, Vc, VCh) Elongation, δ (%) Hardness (HB)
35 22 140-170
40 15 140-202
45 10 140-225
50 7 153-245
60 3 192-277
70 2 228-302
80 2 248-351
100 2 270-360

Recommended Chemical Composition of SG Cast Iron

Grade (ВЧ, Vc, VCh) C Si Mn P S Cr Cu Ni
35 2.7-3.8 0.8-2.9 0.2-0.6 0.1 0.02 0.05 - -
40 2.7-3.8 0.5-2.9 0.2-0.6 0.1 0.02 0.1 - -
45 2.7-3.8 0.5-2.9 0.3-0.7 0.1 0.02 0.1 - -
50 2.7-3.8 0.8-2.9 0.4-0.7 0.1 0.02 0.15 - -
60 3.0-3.6 2.4-2.8 0.4-0.7 0.1 0.02 0.15 0.3 0.4
70 3.0-3.6 2.6-2.9 0.4-0.7 0.1 0.015 0.15 0.4 0.6
80 3.2-3.6 2.6-2.9 0.4-0.7 0.1 0.01 0.15 0.6 0.6
100 3.2-3.6 3.0-3.8 0.4-0.7 0.1 0.01 0.15 0.6 0.8

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