AISI 4140 Alloy Steel

1.CHARACTER:

AISI 4140 Alloy Steel is a common chromium-molybdenum steel that usually used after quenched and tempered, with high intensity, high hardenability. The alloy 4140 plate also has high fatigue strength and good low-temperature impact toughness.

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.

2.CHEMICAL COMPOSITION

3.SUPPLY RANGE:

Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.

Forged Round Bar: 20mm - 650mm (Dia)

Rolled Bars: 12mm - 360mm (Dia)

Forged flats: 30-400mm(T)*500-1200mm(W)

Rolled flats: 10-360mm(T)*30-1020mm(W)

Other sizes of O1 material or as per customer’s requirements

4.HEAT TREATMENT：

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.

5.APPLICATION：

High and moderately stressed components for automobile industry and mechanical engineering – shafts, connecting rods, crankshafts, screws, etc.