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Author: dr funda
Time: 03/01/00 09:02 PST
This is a reply to message no. 448 by hoghead
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1040 and 4340 steel
1040 is a plain carbon steel. i.e. it has only Carbon and Iron. This medium carbon steel can be strengthened after forming.  Typical uses include carriage bolts, plow, cylinder head studs, and other machined parts.  See 1040 Steel for more info.

4340 is an alloy steel.  Besides Carbon and Iron it also has Nickel, Chromium, Manganese, and Molybdenum among others. This steel is heat treated by quenching in oil and tempering to the required hardness. This steel heat treats well and can possess a good mix of strength and toughness. Typical applications are piston pins, bearings, gears, die blocks, etc.  See 4340 Steel for more info.

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