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 % |
1.What is 4140 tool steel?
4140 is a low-alloy steel used in many different industries and a popular material Xometry offers, thanks to its versatility. In order to give it special properties, this type of steel is alloyed with chromium and molybdenum.
2.What is AISI 4140 steel grade?
What is 4140 Steel? AISI 4140 steel is a low alloy steel containing chromium, molybdenum, and manganese. It is widely used across numerous industries and is an excellent material choice due to its toughness, high fatigue strength, and abrasion and impact resistance.
3.What is AISI 4140 equivalent to?
AISI 4140 offers good wear and tear resistance in quenched and tempered conditions. AISI 4140 equivalent grades are SAE 4140 and UNS G41400. AISI 4140 hardness is more as compared to other steel grades.
4.Is AISI 4140 a stainless steel?
While stainless steel's corrosion resistance and mechanical properties can be further enhanced by adding other elements, such as nickel, molybdenum, titanium, niobium, manganese, etc. AISI 4140 steel contains 0.80-1.10% chromium, so you can see 4140 steel is not stainless steel.
5.Is the AISI 4140 expensive?
No, 4140 steel is not usually considered an expensive alloy steel. It provides very good mechanical properties for what it costs. It's cheaper than many special high-strength alloys. However, it does cost more than plain carbon steels because it contains chromium and molybdenum.