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Aircraft Alloy Steel AISI 4140 (AMS 6349/ AMS 6382)
Technical Data Sheet
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.
| Chemical Composition Limits | |||||
| Weight% | C | Si | Mn | Cr | Mo |
| 4140 Ann | 0.40 | 0.25 | 0.85 | 1.00 | 0.25 |
| 4140 Normalised | 0.40 | 0.25 | 0.85 | 1.00 | 0.25 |
Typical Mechanical Properties
| Alloy | Section mm | Yield Strength MPa | Tensile Strength MPa | Elongation % | Izod J | Hardness HB |
| Alloy 4140 | 50 | 770 | 930 | 17 | 90 | 275 |
| Alloy 4140 | 100 | 710 | 920 | 15 | 70 | 270 |
| Alloy 4140 | 200 | 570 | 850 | 14 | 60 | 250 |
Availability
Alloy 4140 (AISI 4140) is available in Bars (Rounds, Flat, Square, Hexagons), Powder. For all stock availability contact Sales.
NEW - Aircraft Materials now offers a comprehensive range of high-quality Alloy 4140 metal powders, produced and tested to exacting standards for use in all processes including Additive Manufacturing (AM), Near-Net Shape Powder Metallurgy (NNS/PS) and Hot-Isostatic Pressing (HIP). Find out more email us with your quality Alloy 4140 metal powder requirements: powders@aircraftmaterials.com
Specifications
AMS 6349
AMS 6382
AMS S 5626
MIL S 5626
AS 1444-1996
UNS G41400
Heat Treatments
4140 Forging:
Heat to 1150°C Hold until uniform. Minimum forging temperature 850°C. Cool slowly in ashes or sand etc.
4140 Annealing:
Heat to 830°C-850°C. Cool in furnace
4140 Normalising:
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
4140 Hardening:
Heat to 830°C- 800°C
Quench in oil or polymer
4140 Tempering:
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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Disclaimer
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.
