Aircraft Alloy Steel AISI 4140 (AMS 6349/ AMS 6382)
Technical Data Sheet
|Chemical Composition Limits|
Alloy 4140 (AISI 4140) is a low alloy steel containing Chromium and Molybdenum. Alloy 4140 is the most widely used alloy for oil patch applications. Usually supplied hardened and tempered to condition T in sections up to 100mm with a tensile strength of 850 - 1000MPa and aiming for this strength range in larger sections. Alloy 4140 (AISI 4140) offers a very good balance of strength, toughness and wear resistance. Other typical applications are axles, conveyor parts, crow bars, gears, logging parts, spindles, shafts, pump shafts, sprockets, studs, pinions, rams, ring gears.
Typical Mechanical Properties
|Alloy||Section mm||Yield Strength MPa||Tensile Strength MPa||Elongation %||Izod J||Hardness HB|
AMS S 5626
MIL S 5626
Heat to 1150°C Hold until uniform. Minimum forging temperature 850°C. Cool slowly in ashes or sand etc.
Heat to 830°C-850°C. Cool in furnace
Heat to 870°C-900°C
Cool in still air
4140 Stress Relieving:
Annealed: Heat to 600°C - 650°C
Hardened: Heat to 500°C - 550°C
Heat to 830°C- 800°C
Quench in oil or polymer
Heat to 450°C-700°C cool in still air
NB Tempering within the range 200°C - 420°C will result in temper brittleness and should be avoided
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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.
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