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.
CHEMICAL COMPOSITION
| Element | C | Mn | Si | P | S | Mo |
| 4140 | 0.38~0.43% | 0.75~1.0% | 0.15~0.30% | 0.035% | 0.04% | 0.15~0.25% |
| 4130 | 0.28~0.33% | 0.70~0.90% | 0.15~0.35% | 0.035% | 0.04% | 0.15~0.25% |
HEAT TREATMENT OPTION
- +A: Annealed (full/soft/spheroidizing)
- +N: Normalized
- +NT: Normalized and tempered
- +QT: Quenched and tempered (water/oil)
FABRICATION AND HEAT TREATMENT
Machinability
AISI 4140 alloy steel has good machinability in the annealed
condition.
Forming
AISI 4140 alloy steel has high ductility. It can be formed using
conventional techniques in the annealed condition. It requires more
pressure or force for forming because it is tougher than plain
carbon steels.
Welding
AISI 4140 alloy steel can be welded using all conventional
techniques. However, the mechanical properties of this steel will
be affected if it is welded in the heat-treated condition, and
post-weld heat treatment should be performed.
Heat Treatment
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by
quenching in oil. Before hardening, it can be normalized by heating
it at 913°C (1675°F) for a long period of time, followed by air
cooling.
Forging
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)
Hot Working
AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to
1900°F)
Cold Working
AISI 4140 alloy steel can be cold worked using conventional methods
in the annealed condition.
Annealing
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by
slowly cooling in the furnace.
Tempering
AISI 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, a tensile strength of 225 ksi can 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
AISI 4140 alloy steel can be hardened by cold working, or heating
and quenching.
