Introduction
4140 Alloy 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.
Chemical composition and Physical properties Of 4140 Alloy Steel
| Chemical composition of 4140 Alloy Steel | ||||||
Element | C | Cr | P | S | Si | Fe |
Content | 0.38-.43% | 0.80-1.10％ | 0.035max | 0.040% max | 0.15-0.30% | balance |
Application
This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs, and collars.
Heat Treatment：4140 Alloy Steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C (1675°F) for a long period of time followed by air cooling.
Forging：Forging of this steel should be carried out between 2200 and 1650 º F (1200 and 900 º C). The lower the finishing temperature from forging, the finer will be the grain size. This alloy should ideally not be forged below 1650 º F (900 º C) and should be slow cooled after forging.
Hot Working：4140 Alloy Steel alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)
Annealing：4140 Alloy Steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
Tempering：4140 Alloy Steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has a lower tempering temperature. For example, the tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
Hardening：4140 Alloy Steel can be hardened by cold working, or heating and quenching.
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