M2 :- High speed steel tool is a general purpose molybdenum-type high-speed steel exhibiting well-balanced toughness, wear-resistance and red hardness properties. This grade is commonly used in cold work punches and dies and cutting applications involving high-speed and light cuts.
» USA: AISI M2
» France: AFNOR Z85WDCV6.5.4.2
» Japan: JIS SKH51
» Sweden: SS 2722
» Germany: 1.3343
» Europe: HS 6-5-2
» UK: BM2
| C | Cr | SI | Mn | Mo | W | V | P | S | |
| Min | 0.86 | 3.75 | 0.20 | 0.20 | 4.50 | 5.50 | 1.70 | -- | -- |
| Typical | 0.9 | 4.00 | 0.30 | 0.30 | 5.00 | 6.00 | 1.90 | -- | -- |
| Max | 0.94 | 4.50 | 0.40 | 0.40 | 5.50 | 6.70 | 2.10 | 0.035 | 0.035 |
APPLICATIONS
- » Twist Drills
- » Knives
- » Broaches
- » Reamers
- » Taps and dies
- » Milling cutters
- » Saws
- » Cold work tools
FORM SUPPLIED
- » Drawn wire
- » Square bars
- » Discs
- » Sheets
- » Round bars
- » Flat bars
- » Bi-metal edges
- » Strips
- » Wire rod
Available surface conditions : drawn, ground, hot rolled, cold rolled, peeled, turned.
HEAT TREATMENT
- Stress-releiving at 600ºC to 700ºC for approximately 2hours, slow cooling down to 500 ºC.
- Soft Annealing in a protective atmosphere at 850-900ºC for 3 hours, followed by slow cooling 10ºC per hour down to 700ºC, then air cooling.
- Hardening in a protective atmosphere with pre-heating in 2 steps at 450-500 ºC and 850-900 ºC and austenitising at a temperature suitable for chosen working hardness. 2 tempers at 560ºC are recommended with at least 1 hour holding time, each time.
| Tool | Hardening | Tempering |
| single edge cutting tools | 1220 ºC | 560 ºC |
| multi edge cutting tools | 1180-1220 ºC | 560 ºC |
| cold work tools | 1050-1150 ºC | 560 ºC |
PROCESSING
M2 can be worked as follows :
- Machining( grinding,turning,milling)
- Polishing
- Hot forming
- Electrical discharge machining
- Welding(special procedure incl. pre-heating & filler
materials of base material composition)
GRINDING
During Grinding, local heating of the surface, which can alter the temper, must be avoided. Grinding wheel manufacturers can provide advise on the choice of grinding wheels.
SURFACE TREATMENT
The Steel Grade is a perfect substrate material for PVD coating. If nitriding is requested, a small diffusion zone is recommended but avoid compound and oxidized layers.
DELIVERY HARDNESS
- » Typical soft annealed hardness is 250 HB
- » Cold drawn and cold rolled material is typically 10-40 HB harder
