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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.
Not many grades can match the versatility and usefulness of 4140.
How is 4140 Steel Made?
AISI 4140 is made by placing iron, carbon, and other alloying elements into an electric furnace or oxygen furnace. The major alloying elements added to AISI 4140 are:
- Chromium
- Manganese
- Molybdenum
Once the iron, carbon, and other alloying elements have been mixed together in liquid form, it is allowed to cool. The steel may then be
annealed; possibly several times.
After the annealing is complete, the steel is heated to a molten phase again so that it can be poured into the desired form and can either be hot worked or cold worked through rollers or other tools to reach the desired thickness. Of course, there are other special operations that can be added to this to reduce mill scale or improve mechanical properties.