AISI M35 high speed tool steel manufacturers and suppliers, supplied in round bar,square bar,flat bar,plate,sheet and wire. AISI M35 steel is a medium-alloyed cobalt high speed steel,which is also called HSSE or HSS-E.It is similar with M2,but add more 5% cobalt which will increase hot hardness.M35 has good machinability,toughness,hardness,wear resistance and cutting ability. By virtue of these well balanced properties,M35 has come into very wide use for cutting tools.
1.Supply Form & Size & Tolerance
| Round bar | ||||
| Diameter | 1-16mm | 10-50mm | 50-180mm | 180-300mm |
| Process | Cold Drawn | Hot Rolled | Hot Forged | Free Forging |
| Flat bar | ||||
| Thickness | 1-2.5mm | 1.5-20mm | 20-300mm | |
| Width | Max 800mm | Max 800mm | Max 800mm | |
| Process | Cold Drawn | Hot Rolled | Hot Forged | |
Remark:Tolerance can be customized as per requests
2.Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Cr | V | Mo | W | Co |
| ASTM A600 | M35 | 0.80-0.85 | 0.2-0.4 | 0.03 | 0.03 | 0.2-0.4 | 3.9-4.4 | 1.75-2.15 | 4.75-5.25 | 6.15-6.65 | 4.75-5.25 |
| DIN EN ISO 4957 | 1.3243 | 0.88-0.96 | 0.4 | 0.03 | 0.03 | 0.45 | 3.8-4.5 | 1.70-2.00 | 4.70-5.20 | 6.00-6.70 | 4.50-5.00 |
| JIS G4403 | SKH55 | 0.87-0.95 | 0.4 | 0.03 | 0.03 | 0.45 | 3.8-4.5 | 1.70-2.10 | 4.70-5.20 | 5.90-6.70 | 4.50-5.00 |
3.Physical Property
| Temperature °C | |||
| 20 | 400 | 600 | |
| Density,g/cm³ | 8.15 | 8.05 | 7.99 |
| Modulus of Elasticity,kN/mm² | 230 | 205 | 184 |
| Coefficient of Thermanl expansion from 20°C,10^-6 | _ | 11.6 | 11.9 |
| Thermal Conductivity,W/m °C | 24 | 28 | 27 |
| Specific Heat,J/kg °C | 420 | 510 | 600 |
| Machinability (1% carbon steel) | 45.0 - 50.0% | ||
| CTE, linear,21 - 399°C, μm/m°C | 11.4 | – | |
| CTE, linear,21 - 593°C, μm/m°C | 11.5 | ||
4.Quenching Hardness
| Hardness, Rockwell C (oil quenched from 1177°C, 5 mins) | 65.2HRC |
| Hardness, Rockwell C (oil quenched from 1204°C, 5 mins) | 65.2HRC |
| Hardness, Rockwell C (oil quenched from 1232°C, 5 mins) | 64.8HRC |
5.Forging
Pre heat the AISI M35 with two steps.First,heat slowly and uniformly to 450-500°C with a rate not exceeding 220°C per hour,second,heat more quickly to the forging temperature of 950-1150°C.Re-heating is necessary when temperature below 950°C. Slow cooling in furnace after forging.
6.Annealing
Annealing must be performed after hot working ,forging, or before re-hardening.Heat the temperature to 850to 900°C with a rate not exceeding 220°C per hour(one hour per 25mm of total thickness).Controlled slow cooling in furnace at 10 to 20°C per hour to approximately 600°C, followed by cooling in still air. The M35 annealed hardness achieved should be 260 Brinell or lower.
7.Stress Relieving
It is recommended to stress relieve after machining and prior to hardening to minimise the possibility of distortion.Heat in a neutral atmosphere to the temperature of 600 to 700°C, and soak for approximately two hours,followed by slow cooling in the furnace.
8.Hardening
Preheat M35 with two steps ,first step with 450-500°C, holding 20~30 minutes per 25 mm. Second step with 850-900°C,then to the appropriate hardening temperature 1050°C – 1220°C.
Quenchant: By oil(40~60℃) , air or hot bath .
9.Tempering
Tempering should be carried out immediately after quenching. Triple tempering is recommended for M35,heat slowly and uniformly to the tempering temperature 510-620°C,soak well not less than 2 hours per cycle(one hour per 25mm of total thickness). The minimum hardness is 64HRC.
| Temperature,°C | 540 | 560 | 580 |
| Hardness,HRC | 67 | 66 | 65 |
10.Guidelines for Hardening&Tempering
Typical Application | M35 | |
| Hardening | Tempering(twice) | |
| Single- edge cutting tools, tool bits, form tools, etc | 1220°C | 560°C |
| Rotating multi-edge cutting tools, twist drills, saws, milling cutters broaches, taps, etc. | 1180°C – 1220°C | 560°C – 580°C |
| Tools for cold work applications, punching, blanking, forming, cold extrusion, etc. | 1050°C – 1150°C | 560°C – 590°C |
11.Application
AISI M35 is widely use in many applications,typical use as follow:
1.Forging Industry: Forging Dies, Cold Forming Tools
2.Cutting Tools: Hobs, Twist Drills, Milling Cutter
3.Screw Industry: Taps, Punches, Trimming Dies
