- 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.
- Heat uniformly to 800°C, equalize, then furnace cool. (Hardness about 229 Brinell).
- 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.
- Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
- Heat uniformly to 800/820°C until heated through. Allow 30 minutes per inch of ruling section and quench immediately in oil.
|Name of Material||Composition in %of Weight||Thermal Conductivity W/m-k||Density kgm3||Melting point °C|
|EN-31 IS-103 Crl||1.5||0.52||0.22||1.3||0.05||0.05||–||46.6||7810||1540|
|Tensile Strength||750 N/mm²|
|Yield Stress||450 N/mm²|
|Reduction of Area||0.45|
|Modulus of elasticity||215 000 N/mm²|
Heat Treatment of EN-31:
|Hardening Temperature||802- 860 C|
|Tempering Temperature||180- 225 C|
|Brinell-Rockwell Hardness||59 – 65|