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AISI 4130 | 25CrMo4 | SCM430 | 1.7218 Alloy Steel

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AISI 4130 Suppliers - 25CrMo4 , SCM430 , 1.7218 Steel (Oil & Gas Materials)

AISI 4130 alloy steel contains chromium and molybdenum as strengthening agents. It has low carbon content, and hence it can be welded easily. The datasheet given below provides more details about material 4130 alloy steel.

AISI 4130 is equivalent to

Country	USA	BS	BS	Japan
Standard	ASTM A29	EN 10250/EN10083	BS 970	JIS G4105
Grades	4130	25CrMo4/1.7218	708A25/708M25	SCM430

Chemical Composition of SCM430 Steel

Standard	Grade	C	Mn	P	S	Si	Cr	Mo
ASTM A29	4130	0.28-0.33	0.40-0.60	0.035	0.040	0.15-0.35	0.80-1.10	0.15-0.25
EN10250 /EN10083	25CrMo4/ 1.7218	0.22-0.29	0.60-0.90	0.025	0.035	≦0.40	0.90-1.2	0.15-0.30
JIS G4105	SCM430/ SCM2	0.28-0.33	0.60-0.85	0.030	0.030	0.15-0.35	0.90-1.2	0.15-0.30

Mechanical Properties of 25CrMo4 (4130 Alloy Steel)

Properties	Metric	Imperial
Tensile strength, ultimate	560 MPa	81200 psi
Tensile strength, yield	460 MPa	66700 psi
Modulus of elasticity	190-210 GPa	27557-30458 ksi
Bulk modulus (Typical for steel)	140 GPa	20300 ksi
Shear modulus (Typical for steel)	80 GPa	11600 ksi
Poissons ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	21.50%	21.50%
Reduction of area	59.6	59.60%
Hardness, Brinell	217	217
Hardness, Knoop (Converted from Brinell hardness)	240	240
Hardness, Rockwell B (Converted from Brinell hardness)	95	95
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.)	17	17
Hardness, Vickers (Converted from Brinell hardness)	228	228
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.)	70	70

Fabrication and Heat Treatment of 4130 Oilfield Steels

Machinability

1.7218 steel can be easily machined using conventional methods. However, machining becomes difficult when the hardness of the steel is increased.

Forming

Forming of 7218 steel can be performed in the annealed condition.

Welding

Welding of AISI 4130 steel can be performed by all commercial methods.

Heat Treatment

AISI 4130 steel is heated at 871°C (1600°F) and then quenched in oil. This steel is usually heat-treated at temperatures ranging from 899 to 927°C (1650 to 1700°F).

Forging

Forging of AISI 4130 steel can be performed can be performed at 954 to 1204°C (1750 to 2200°F).

Hot Working

Hot working of AISI 4130 steel can be done at 816 to 1093°C (1500 to 2000°F).

Cold Working

AISI 4130 steel can be cold worked using conventional methods.

Annealing

AISI 4130 steel can be annealed at 843°C (1550°F) followed by air cooling at 482°C (900°F).

Tempering

Tempering of AISI 4130 steel can be performed at 399 to 566°C (750 to 1050°F), depending on the desired strength level.

Hardening

Hardening of AISI 4130 steel can be done with cold working or heat treatment.

Applications for Alloy Steel AISI 4130

The following are some of the major applications of AISI 4130 alloy steel:

Aircraft engine mounts
Welded tubing

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