HIGH SPEED TOOL STEELS SKH GRADE
| MATERIALS GRADE |
CHEMICAL COMPOSITION % | |||||||||
| C | Si | Mn | P | S | Cr | Mo | W | V | Co | |
| SKH2 | 0.73~0.83 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 17.20~18.70 | 1.00~1.20 | ||
| SKH3 | 0.73~0.83 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 17.00~19.00 | 0.80~1.20 | 4.50~5.50 | |
| SKH4 | 0.73~0.83 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 17.00~19.00 | 1.00~1.50 | 9.00~11.00 | |
| SKH10 | 1.45~1.60 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 11.50~13.50 | 4.20~5.20 | 4.205.20 | |
| SKH40 | 1.23~1.33 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.70~5.30 | 5.70~6.70 | 2.70~3.20 | 8.00~8.80 |
| SKH50 | 0.77~0.87 | 0.70 max. | 0.45 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 8.00~9.00 | 1.40~2.00 | 1.00~1.40 | |
| SKH51 | 0.80~0.88 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.70~5.20 | 5.90~6.70 | 1.70~2.10 | |
| SKH52 | 1.00~1.10 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 5.50~6.65 | 5.90~6.70 | 2.30~2.60 | |
| SKH53 | 1.15~1.25 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.70~5.20 | 5.90~6.70 | 2.70~3.20 | |
| SKH54 | 1.25~1.40 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.20~5.00 | 5.20~6.00 | 3.70~4.20 | |
| SKH55 | 0.87~0.95 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.70~5.20 | 5.90~6.70 | 1.70~2.10 | 4.50~5.00 |
| SKH56 | 0.85~0.95 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 4.70~5.20 | 5.90~6.70 | 1.70~2.10 | 7.00~9.00 |
| SKH57 | 1.20~1.35 | 0.45 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.80~4.50 | 3.20~3.90 | 9.00~10.00 | 3.00~3.50 | 9.50~10.50 |
| SKH58 | 0.95~1.05 | 0.70 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.50~4.50 | 8.20~9.20 | 1.50~2.10 | 1.70~2.20 | |
| SKH59 | 1.05~1.15 | 0.70 max. | 0.40 max. | 0.030 max. | 0.030 max. | 3.50~4.50 | 9.00~10.00 | 1.20~1.90 | 0.90~1.30 | 7.50~8.50 |
QUENCH-TEMPER HARDNESS (FOR CUTTING USE)
| MATERIALS GRADE |
HEAT TREATMENT ℃ | QUENCH-TEMPER HARDNESS HRC | |
| QUENCH | TEMPER | ||
| SKH2 | 1260 Oil quench | 560 Air cooled | 63min. |
| SKH3 | 1270 Oil quench | 560 Air cooled | 64min. |
| SKH4 | 1270 Oil quench | 560 Air cooled | 64min. |
| SKH10 | 1230 Oil quench | 560 Air cooled | 64min. |
| SKH40 | 1180 Oil quench | 560 Air cooled | 65min. |
| SKH50 | 1190 Oil quench | 560 Air cooled | 63min. |
| SKH51 | 1220 Oil quench | 560 Air cooled | 64min. |
| SKH52 | 1200 Oil quench | 560 Air cooled | 64min. |
| SKH53 | 1200 Oil quench | 560 Air cooled | 64min. |
| SKH54 | 1210 Oil quench | 560 Air cooled | 64min. |
| SKH55 | 1210 Oil quench | 560 Air cooled | 64min. |
| SKH56 | 1210 Oil quench | 560 Air cooled | 64min. |
| SKH57 | 1230 Oil quench | 560 Air cooled | 66min. |
| SKH58 | 1200 Oil quench | 560 Air cooled | 64min. |
| SKH59 | 1190 Oil quench | 5650 Air cooled | 66min. |