Description
The primary application of high-speed steels is to tools used for the working of metals at high cutting speeds. Cutting metal at high speed generates heat, the penetration of the cutting tool edge into the work material requires great hardness and strength, and the continued frictional contact of the tool with both the parent material and the detached chips can only be sustained by an abrasion-resistant tool edge.
Сhemical composition
| AISI | C | Mn | Si | S | P | Cr | V | W | Mo | Other |
| M2 | 0.80-0.90 | 0.15-0.40 | 0.20-0.45 | ≤0.03 | ≤0.03 | 3.75-4.50 | 1.75-2.20 | 5.50-6.75 | 4.50-5.50 | - |
| M3 | 1.00-1.10 | 0.15-0.40 | 0.20-0.45 | ≤0.03 | ≤0.03 | 3.75-4.50 | 2.25-2.75 | 5.00-6.75 | 4.75-6.50 | - |
| M7 | 0.97-1.05 | 0.15-0.40 | 0.20-0.55 | ≤0.03 | ≤0.03 | 3.50-4.00 | 1.75-2.25 | 1.40-2.10 | 8.20-9.20 | - |
| M35 | 0.88-0.96 | 0.20-0.40 | 0.25-0.45 | ≤0.03 | ≤0.03 | 3.80-4.50 | 1.70-2.00 | 6.00-6.70 | 4.70-5.20 | Co=4.50-5.50 |
| M42 | 1.05-1.15 | 0.15-0.40 | 0.15-0.65 | ≤0.03 | ≤0.03 | 4.50-4.25 | 0.95-1.35 | 1.15-1.85 | 9.00-10.00 | Co=7.75-8.75 |
| T1 | 0.65-0.80 | 0.10-0.40 | 0.20-0.40 | ≤0.03 | ≤0.03 | 3.75-4.50 | 0.90-1.30 | 17.25-18.75 | - | - |
| T4 | 0.70-0.80 | 0.10-0.40 | 0.20-0.40 | ≤0.03 | ≤0.03 | 3.75-4.50 | 0.80-1.20 | 17.50-19.00 | 0.40-1.00 | Co=4.25-5.75 |
Heat treatment requirements
| AISI | Annealing T, °C |
Stress Relieving T, °C |
Quenching T, °C |
Quenching Media* |
Tempering T, °C |
Rockwell Hardness |
| M2 | 840-860 | 720-760 | 1210-1230 | S/O/A | 540-560 | 63-66 |
| M3 | 840-860 | 720-760 | 1210-1230 | S/O/A | 540-560 | 63-66 |
| M7 | 840-860 | 720-760 | 1210-1230 | S/O/A | 540-560 | 63-66 |
| M35 | 840-860 | 720-760 | 1200-1235 | S/O/A | 540-560 | 64-67 |
| M42 | 840-860 | 720-760 | 1160-1190 | S/O/A | 530-560 | 66-68 |
| T1 | 840-860 | 720-760 | 1270-1285 | S/O/A | 550-570 | 63-66 |
| T4 | 840-860 | 720-760 | 1270-1285 | S/O/A | 550-570 | 63-66 |
*Note: S - Salt bath; O - oil; A - air
Specification range
| Grade | Round bar/Wire | Flat bar / Sheet / Plate | |
| AISI | Diameter, mm | Thickness, mm | Width, mm |
| M2 | 1.00 - 260.00 | 1.50 - 65.00 | 15.00 - 510.00 |
| M3 | 1.00 - 260.00 | ||
| M7 | 15.00 - 80.00 | ||
| M35 | 2.00 - 160.00 | ||
| M42 | 16.00 - 160.00 | ||
| T1 | 3.00 - 160.00 | ||
| T4 | 3.00 - 160.00 | ||
Equivalents:
| AISI | W.N. | EU | GOST |
| M2 | 1.3343 | HS6-5-2 | Р6М5 |
| M3 | 1.3344 | HS6-5-3 | Р6М5Ф3-МП |
| M7 | 1.3348 | HS2-9-2 | Р2М9-МП |
| M35 | 1.3243 | HS6-5-2-5 | Р6М5К5 |
| M42 | 1.3247 | HS2-10-1-8 | Р2АМ9К5 |
| T1 | 1.3355 | HS18-0-1 | Р18 |
| T4 | 1.3255 | HS18-1-2-5 | Р18 |
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High-Speed Steel (M2, M3, M7, M35, M42, T1, T4)
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