AISI 4140 G41400 1.7225 42CrMo4 SCM440 Quenched Tempered Alloy Steel Round Bar

Model: 4140 G41400 1.7225 42CrMo4 SCM440

Item specifics

Diameter: 30-300mm

Surface Condition: Black, Peeled

Delivery condition: Quenched+Tempered

Review

Description

Introduce of 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. Not many grades can match the versatility and usefulness of 4140.

Applications of 4140 Steel 

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.

Chemical Composition(%):

Grade

C

Si

Mn

P

S

Cr

Mo

42CrMo4

0.38- 0.45

0.40

max

0.60-

0.90

0.025

max

0.035 max

0.90- 1.20

0.15- 0.30

Mechanical Property

Grade	42CrMo4 Mechanical Property
Grade	Thickness	Yield	Tensile	Elongation
42CrMo4	mm	Min Mpa	Mpa	Min %
	3<t≦8	900	1100-1300	10
	8<t≦20	750	1000-1200	11
	20<t≦60	650	900-1100	12
	60<t≦100	550	800-950	13
	100<t≦160	500	750-900	14

Heat Treatment of 4140 Steel

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.

Annealing of 4140 Steel

AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.

Tempering of 4140 Steel

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 of 4140 Steel

AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.

Machinability 

Machinability of 4140 Steel

AISI 4140 alloy steel has good machinability in the annealed condition.

Forming of 4140 Steel

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 of 4140 Steel

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.