1.2550 Tool Steel

1.2550 AISI S1 is a high duty shock resisting alloy tool steel. In the hardened condition 1.2550 60WCrV7 is a heat resisting tool steel that combines great hardness with good toughness and shock resisting properties. 1.2550 tool steel is one of the shock resisting tool steel types with very good toughness in combination with high hardenability. Impact-resistant, tungsten-alloyed cold-work tool.

Application include cutting tools (dies, punchers) for plate, woodworking tools, blanking dies for cutting sheet metals up to 12 mm thickness, trimming and spliting dies, cold piercing punches, performing punches, shear blades, chipping knives, pneumatic chisels, coining tools, cold shear blades, ejectors.

Forging: Heat the 1.2550 tool steel component slowly and uniformly to 1000°C.  Forge within a range of 1000/800°C, reheating if necessary. Cool slowly (preferably in a furnace) to avoid setting up stresses.

Annealing: Heat the 1.2550 tool uniformly to 770°C, equalise, then furnace cool. 

Stress Relieving: If machining operations have been heavy or if the 1.2550 tool has an unbalanced section, remove stress before hardening by heating up to 700°C, equalise, then cool slowly. 

Hardening: Pre heat the 1.2550 tool steel to 650°C and thoroughly soak. Continue heating to the final hardening temperature of 900/950°C. Allow sufficient time for the component to be heated through. Quench in oil. 



Martempering: Martempering is an alternative hardening procedure for 1.2550 which may be used when suitable salt bath equipment is available. 

Tempering: Heat uniformly and thoroughly at the selected tempering temperature and hold for at least one hour per inch of total thickness