These are oil-hardening steels of relatively high hardenability. Their chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. These grades are especially suitable for forging because they have self-scaling characteristics. They respond readily to heat treatment and are comparatively easy to machine in the heat treated condition. They resist creep in temperatures up to 1000°F and maintain their properties even after long exposure at these relatively high working temperatures. With a combination of such highly desirable properties as good strength and wear resistance, excellent toughness coupled with good ductility, and the ability to resist stress at elevated temperatures, it is understandable why these are widely used and highly successful alloy steels.

This material is also available as leaded steel. The addition of lead improves machinability without sacrificing other desirable properties, with the exception that the use of this material is not recommended for applications over 400°F, since at elevated temperature ductility is low.

The following specifications are generally applicable for 4140/42 Heat Treated Rounds: ASTM A 434, Grades BC and BD.

Oil Quenched and Tempered — Machine Straightened

Stock Lengths 20' Approx.
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Size

Estimated Weight per Foot

Estimated Weight 20-Ft. Bar

N/A 104.4 lb N/A 2088 lb
N/A 112.9 lb N/A 2259 lb
N/A 121.8 lb N/A 2436 lb
N/A 131.0 lb N/A 2619 lb
N/A 140.5 lb N/A 2810 lb
N/A 150.4 lb N/A 3007 lb
N/A 160.5 lb N/A 3211 lb
N/A 171.1 lb N/A 3421 lb
N/A 181.9 lb N/A 3638 lb
N/A 193.1 lb N/A 3862 lb
N/A 204.6 lb N/A 4093 lb
N/A 216.5 lb N/A 4330 lb
N/A 228.7 lb N/A 4574 lb
N/A 241.2 lb N/A 4824 lb
N/A 254.1 lb N/A 5082 lb
N/A 267.3 lb N/A 5346 lb
N/A 280.8 lb N/A 5616 lb
N/A 294.7 lb N/A 5894 lb
N/A 323.4 lb N/A 6468 lb
N/A 353.5 lb N/A 7070 lb
N/A 384.9 lb N/A 7698 lb
N/A 417.6 lb N/A 8353 lb
N/A 451.7 lb N/A 9034 lb
N/A 487.1 lb N/A 9743 lb
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