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Old 04-05-2006, 12:15 AM   #1 (permalink)
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Tool steel differences

What is the difference between 4140 & 4142 tool steel?
Ed Gilbert
1977 FJ40, 5.7L Vortec
F-Toy #F006 build in-progress

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Old 04-05-2006, 08:18 AM   #2 (permalink)
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4000 series steels are low alloy cro-moly, not tool steels.

4140 and 4142 are the same except 4142 has a bit more carbon in it (slightly higher strength, slightly more hardenable).

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Old 04-05-2006, 04:29 PM   #3 (permalink)
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AISI 4140 FM*
As Rolled and Annealed
A medium carbon alloy grade that is used for many parts requiring high tensile strength and toughness. It may be heat treated safely over a wide range to give the combined advantages of hardness, strength and ductility.

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AISI 4142 FM*
Heat Treated
This alloy grade is slightly modified with high carbon content and vanadium addition. This plate product is normalized and tempered to 261-321 BHN range in plates up to 3 inches thick and 241-321 BHN range above 3 inches thick. The obvious advantage of this alloy plate product is that it may be used without further heat treatment.

So 4142 is already pre hardened
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Last edited by jeepguy616; 04-05-2006 at 04:30 PM.
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