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| AISI |
GRADE NAME |
ANNEALING TEMP. °F |
TYPICAL ANN. HDN. BRINELL |
PREHEAT TEMP. °F |
AUSTENITIZING TEMP. °F |
TEMPERING TEMP. °F |
TYPICAL APPLICATION HARDNESS HRC. |
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| M1 | REX TMO | 1550/1600 | 217/235 | 1500/1550 | 2175/2225 | 1025/1050 | 64-66 | |
| M2 | REX M2 (S) | 1550/1600 | 229/241 | 1500/1550 | 2175/2225 | 1025/1050 | 64-66 | |
| M2 | REX M2 HCHS | 1550/1600 | 229/241 | 1500/1550 | 2175/2200 | 1025/1050 | 64-66 | |
| M3 | REX M3-1 | 1550/1600 | 229/241 | 1500/1550 | 2185/2210 | 1025/1050 | 65-67 | |
| M4 | REX M4 | 1550/1600 | 229/241 | 1500/1550 | 2175/2225 | 1025/1050 | 64-66 | |
| M4 | CPM M4 HC(HS) | 1550/1600 | 235/255 | 1500/1550 | 2175/2200 | 1025/1050 | 64-66 | |
| M7 | REX M7N | 1500/1550 | 229/241 | 1500/1550 | 2175/2200 | 1025/1050 | 65-67 | |
| M35 | CPM REX M35 HCHS | 1550/1600 | 229/241 | 1500/1550 | 2175/2210 | 1025/1050 | 65-67 | |
| M42 | REX M42 | 1575/1650 | 235/269 | 1500/1550 | 2125/2175 | 1025/1050 | 65-68 | |
| T4 | REX AAA | NOTE: TOOL BITS SUPPLIED ALREADY HARDENED | 64-66 | |||||
| T8 | REX 95 |
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64-66 | |||||
| T15 | CPM T15(HS) | 1550/1600 | 255/277 | 1500/1550 | 2200/2250 | 1025/1050 | 65-67 | |
| M62 | CPM REX 20(HS) | 1550/1600 | 262/285 | 1500/1550 | 2150/2175 | 1025/1050 | 66-68 | |
| M3+Co | CPM REX 45(HS) | 1550/1600 | 255/277 | 1500/1550 | 2175/2190 | 1025/1050 | 66-68 | |
| M4+Co | CPM REX 54(HS) | 1575/1625 | 241/277 | 1500/1550 | 2100/2200 | 1025/1050 | 64-66 | |
| M48 | CPM REX 76(HS) | 1550/1600 | 285/311 | 1500/1550 | 2150/2175 | 1025/1050 | 67-69 | |
| — | CPM REX 121(HS) | 1625/1675 | 360/410 | 1500/1550 | 2050/2225 | 1025/1050 | 69-71 | |
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Note: High Speed Steels may be quenched in salt, oil, high pressure gas, or forced air.
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