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tool steel

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seat: Beijing
Validity to: Long-term effective
Last update: 2017-12-11 20:43
Browse the number: 210
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BS4659 BS1is a high duty shock resisting alloy tool steel. In the hardened conditionS1 heat resisting toolsteelcombines great hardness with good toughness and shock resisting properties. 

  C. Si. Mn. Cr. V. W
Min.% 0.45 0.25 0.2 1.25 0.15 1.00
Max.% 0.55 0.45 0.4 1.75 0.30 3.00


Forging:
Heat 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 uniformly to 770°C, equalise, then furnace cool.


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, equalise, then cool slowly.
 

Hardening:
Pre heat the S1 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 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.

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