G-I-A | G-I-B | G-I-C | G-I-D | G-II |
Internal cracks | Surface cracks | |||
C > 0.6% | C from 0.17% to 0.24% | C < 0.16 & C from | C from 0.09 | |
0.25% to 0.6% | to 0.17% | |||
Si > 0.5% | Mn > 1% | Mo > 0.25% | Al > 0.004% | |
S > 0.025 | P > 0.03% | Nb from 0.02 | ||
Cr > 3% | to 0.04% | |||
Ni > 1% | S > 0.015 | |||
V > 1% |