| Customization: | Available |
|---|---|
| Type: | Round |
| Standard: | AISI, ASTM, DIN, JIS, GB, BS |
|
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Introduction
AISI 4140 is a chromium-molybdenum alloy steel. The chromium content provides good hardness
penetration, and the molybdenum content ensures uniform hardness and high strength. AISI 4140
chrome-molybdenum steel can be oil hardened to a relatively high level of hardness. The desirable
properties of the AISI 4140 include superior toughness, good ductility and good wear resistance in
the quenched and tempered condition.
The AISI 4140 cold finished annealed chromium-molybdenun alloy steel can be heated using various
methods to yield a wide range of properties, hence it is often used as stock for forging as it has
self-scaling properties. AISI 4140 is capable of resisting creep in temperatures up to 538°C (1000°F)
and maintaining its properties even after long exposure at comparatively high working temperatures.
The AISI 4140 cold rolled rounds are available in the 41L40 variant that contains 0.15-0.35 lead. The
lead content improves machinability, but has significant effect on other desirable properties.
Chemical Composition
AISI 4140 is versatile because of its simple chemistry and has the following composition:
0.40 % carbon and 0.85 % manganese which offers toughness and can be heat treated and
hardened 0.1 % chromium adds to overall toughness but is not enough to be made into
stainless steel 0.25 % molybdenum and small amounts of sulfur, silicon and phosphorous
| C | Cr | Fe | Mn | Mo | P | Si | S |
| 0.380 - 0.430 % | 0.80 - 1.10 % | 96.785 - 97.77 % (As remainder) | 0.75 - 1.0 % | 0.15 - 0.25 % | ≤ 0.035 % | 0.15 - 0.30 % | ≤ 0.040 % |
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