Forging:
- Forge at 1000°/1050°C.
- Heat slowly, allowing sufficient time at the forging temperature for the steel to be thoroughly soaked through.
- Re-heat as often as necessary to keep the temperature above 850°C. After forging cool very slowly, preferably in a furnace.
Annealing:
- Heat uniformly to 800°C, equalize, then furnace cool. (Hardness about 229 Brinell).
Stress Relieving:
- If machining operations have been heavy or if the tool has an unbalanced section, remove stresses before hardening by heating up to 700°C, equalize, then cool slowly.
Tempering:
- Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
Hardening:
- Heat uniformly to 800/820°C until heated through. Allow 30 minutes per inch of ruling section and quench immediately in oil.
Product Details:
| Tempering °C | 100 | 150 | 200 | 250 | 300 | 350 |
|---|---|---|---|---|---|---|
| HRc | 64/63 | 63/62 | 62/61 | 60/59 | 57/56 | 54/53 |
Physical Properties:
| Name of Material | Composition in %of Weight | Thermal Conductivity W/m-k | Density kgm3 | Melting point °C | ||||||
| C | Mn | Si | Cr | S | P | Mg | ||||
| EN-31 IS-103 Crl | 1.5 | 0.52 | 0.22 | 1.3 | 0.05 | 0.05 | – | 46.6 | 7810 | 1540 |
Mechanical Properties:
| Element | Objective |
|---|---|
| Tensile Strength | 750 N/mm² |
| Yield Stress | 450 N/mm² |
| Reduction of Area | 0.45 |
| Elongation | 0.3 |
| Modulus of elasticity | 215 000 N/mm² |
| Density | 7.8 Kg/m3 |
| Hardness | 63 HRC |
Heat Treatment of EN-31:
| Element | Objective |
|---|---|
| Hardening Temperature | 802- 860 C |
| Quenching Medium | Oil |
| Tempering Temperature | 180- 225 C |
| Brinell-Rockwell Hardness | 59 – 65 |
