4140 is great for making your own hammer or tools. 4140 is has great impact toughness.
Chemical Composition:-
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C:
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Cr:
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Mn:
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Si:
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Mo:
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P:
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S:
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0.38-0.43%
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0.9-1.10%
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0.75-1.0%
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0.15-0.30%
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0.15-0.25%
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0.035%
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0.04%
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Suggested Heat Treatments:
Heat to 830 - 850C (Soak until evenly heated throughout)
Oil Quench for smaller parts, Water Quench for large and simple parts (Suggested Oil is Rye 50)
Temper twice for two hours at 200C for approx 54HRc
Supplied Surface Ground Annealed in 50 x 53 x 100mm