Tool Steel
TYPICAL
ANALYSIS:
|
C.
|
Si.
|
Mn.
|
Cr.
|
W.
|
V.
|
|
0.50%
|
0.80%
|
0.40%
|
1.50%
|
2.50%
|
0.20%
|
BS4659
BS1 is a high duty shock resisting alloy tool steel.
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 in air.
Hardening:
Preheat 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 temperatures
and hold for at least one hour per inch of total thickness.
For your guidance refer to our colour
charts for forging, hardening and tempering.
|
Tempering °C
|
150
|
200
|
250
|
350
|
450
|
|
HRC
|
62/61
|
61/60
|
60/59
|
58/57
|
55/54
|
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