STRUCTURAL ALLOY STEELS SCM GRADE
MATERIALS GRADE |
CHEMICAL COMPOSITION % | ||||||
C | Si | Mn | P | S | Cr | Mo | |
SCM415 | 0.13~0.18 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM418 | 0.16~0.21 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM420 | 0.18~0.23 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM421 | 0.17~0.23 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM430 | 0.28~0.33 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM432 | 0.27~0.37 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 1.00~1.50 | 0.15~0.30 |
SCM435 | 0.33~0.38 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM440 | 0.38~0.43 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM445 | 0.43~0.48 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.15~0.30 |
SCM822 | 0.20~0.25 | 0.15~0.35 | 0.60~0.85 | <0.030 | <0.030 | 0.90~1.20 | 0.35~0.45 |
QUENCH-TEMPER HARDNESS (FOR TEST PIECE)
MATERIALS GRADE |
HEAT TREATMENT ℃ | ||
QUENCH | TEMPER | HARDNESS | |
SCM415 | 1st. 850~900Oil quench 2nd. 800~850Oil quench or 925~ 850~900Oil quench |
150~200Air cooled | 235~321 |
SCM418 | 1st. 850~900Oil quench 2nd. 800~850Oil quench or 925~ 850~900Oil quench |
150~200Air cooled | 248~331 |
SCM420 | 1st. 850~900Oil quench 2nd. 800~850Oil quench or 925~ 850~900Oil quench |
150~200Air cooled | 262~352 |
SCM421 | 1st. 850~900Oil quench 2nd. 800~850Oil quench or 925~ 850~900Oil quench |
150~200Air coole | 285~375 |
SCM430 | 830~880Oil quench | 530~630 Rapidly cooled | 241~302 |
SCM432 | 830~880Oil quench | 530~630 Rapidly cooled | 255~321 |
SCM435 | 830~880Oil quench | 530~630 Rapidly cooled | 2691~331 |
SCM440 | 830~880Oil quench | 530~630 Rapidly cooled | 285~362 |
SCM445 | 830~880Oil quench | 530~630 Rapidly cooled | 302~363 |
SCM822 | 1st. 850~900Oil quench 2nd. 800~850Oil quench or 925~ 850~900Oil quench |
150~200Air cooled | 302~415 |