S1
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BS4659 BS1 is a high duty shock resisting alloy tool steel. In the hardened condition S1 heat resisting tool steel combines great hardness with good toughness and shock resisting properties.
| Typical Analysis |
C. |
Si. |
Mn. |
Cr. |
V. |
0.50% |
0.80% |
1.50% |
2.50% |
0.20% |
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.
| Tempering °C |
150 |
200 |
250 |
350 |
400 |
| HRc |
62/61 |
61/60 |
60/59 |
58/57 |
55/54 |
BS4659 BS1 available i:-
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