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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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