SAE4140 & SAE4142 Steel Work/Steel Structures/Steel Machining Parts SAE4140 & SAE4142 are chromium,

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10-May-2024

SAE4140 & SAE4142 are chromium, molybdenum, manganese containing low alloy steel. They have high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The following datasheet gives an overview of SAE4140 & SAE4142 Steel:

SAE4140 & SAE4142 Steel Chemical Composition max

Grade	C	Mn	P	S	Si	Cr	Mo
4140	0.36~0.44	0.75~1.00	0.030	0.040	0.15~0.35	0.80~1.10	0.15~0.25
4142	0.38~0.46	0.75~1.00	0.030	0.040	0.15~0.35	0.80~1.10	0.15~0.25

SAE4140 & SAE4142 Steel Tensile Strength Ranges

Specified Maximum Tensile Strength Ksi（MPa）	Tensile Strength Range Ksi（MPa）
Up to 780 (480)	15 (100)
Over 70 to 110 (480 to 760)	20 (135)
Over 110 to 140 (760 to 965)	25 (170)

SAE4140 & SAE4142 Steel Works/steel structures/Steel Machining Parts Machinability also shown in the following: forming, heat treatment, forging, hot working, cold working, annealing, tempering, and hardening.

SAE4140 & SAE4142 Steel Work/Steel Structures/Steel Machining Parts Repair by Welding

1. Repairs by welding shall be performed by competent welders using low-hydrogen electrodes selected so that the chemical composition of the deposited weld metal is similar to the nominal composition of the base plate.
2. If repair by welding is not acceptable, or if approval of the welding procedure by the purchaser is required, the order shall so specify.
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