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EN31 is a high carbon alloy steel which achieves a high degree of hardness with compressive strength and abrasion resistance.
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TYPICAL ANALYSIS
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C.
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Mn.
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Cr.
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Si.
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1.00%
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0.50%
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1.40%
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0.20%
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Forging:
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.
Annealing:
Heat uniformly to 800°C, equalise, then furnace cool. (Hardness about 229 Brinell).
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:
Heat uniformly to 800/820°C until heated through. Allow 30 minutes per inch of ruling section and quench immediately in oil.
Tempering:
Heat uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
| Tempering °C |
100
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150
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200
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250
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300
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350
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HRc
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64/63
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63/62
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62/61
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60/59
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57/56
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54/53
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