M-2 (1.3343) High speed steel
M-2 (1.3343) High speed steel
Specification
M2 steel is a general purpose molybdenum high speed steel. M2 steel is characterized by balanced combination of abrasion resistance, toughness and good red hardness. Due to its comparatively low carbon content, M2 steel has an excellent combination of toughness properties and abrasion resistance when properly hardened and tempered. M2 steel is used in a wide used for all kinds of cutting tool, milling cutter, knife and punch and die applications.
Application
M2 steel is a high speed steel suitable for cutting tools such as, twist drills, broaches, taps, milling cutters, planer tools, reamers, broaches, thread, chasers, end mills, gear cutters, shaping tools, tool reamers, saws, knives etc. In terms of performance, M2 steel is an all-round steel to be used in cutting conditions where demands for hot hardness are moderate. The term hot hardness is understood as the ability of the steel to retain its hardness even at elevated temperatures. M2 steel is also suitable for cold work applications, e.g. in tools for punching, forming and pressing, etc.
Chemical Analysis %
| C | Mn | Cr | Si | Mo | V | W | P | S |
|---|---|---|---|---|---|---|---|---|
| 0.86-0.94 | 0.20-0.40 | 3.75-4.50 | 0.20-0.45 | 4.50-5.50 | 1.60-2.20 | 5.90-6.75 | 0.030 Max | 0.030 Max |
Delivery condition
Annealed 205-255 HB max
Heat Treatment
| Soft Annealing | Stress-relief annealing | 1st preheating | 2nd and 3rd preheating | Cooling | Hardness | Hardening | Quenching | tempering | Hardness after quenching HRC |
|---|---|---|---|---|---|---|---|---|---|
| 770-860°C | 630 – 650°C | 400°C | 850°C 850-1050°C | Furnace | 255HB | 1190-1230°C | Air, Oil 530-560°C or thermal bath,550°C | At least twice 530-560°C | 63-66 |
| Tempering°C | 300 | 400 | 500 | 600 |
|---|---|---|---|---|
| HRC | 61.5 | 62 | 65 | 63 |