AISI 4140 Chrome-Molybdenum High Tensile Steel

AISI 4140 Chrome-Molybdenum High Tensile Steel

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4140 round steel, is a kind of alloy structural steel, its strength, high NMenability, good toughness, quenching deformation is small.4140 round bar has the characteristics of high strength, high NMenability, good toughness, quenching deformation is small, high creep strength and enduring strength at high temperature. 4140 steel round bar mainly used in the manufacture of 35CrMo steel requirements than the higher strength and tempering cross-section larger forgings, such as locomotive traction with large gears, supercharger transmission gears, rear axle, loaded with a great deal of connecting rods and spring clamps, but also can be used for 2000m below the oil drilling rod joints and salvage tools and other deep wells.

 

 

Country	USA	German	British	Japan	China	Australia
Standard	ASTM A29	DIN 17200	BS 970	JIS G4105	GB/T 3077	AS 1444
Grades	4140	1.7225/ 42CrMo4	42CrMo4	SCM440	42CrMo	4140

 

 

Standard	Grade	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A29	4140	0.38-0.43	0.75-1.00	0.035	0.040	0.15-0.35	–	0.8-1.10	0.15-0.25
EN 10250	42CrMo4/ 1.7225	0.38-0.45	0.6-0.9	0.035	0.035	0.4	–	0.9-1.2	0.15-0.30
JIS G4105	SCM440	0.38-0.43	0.60-0.85	0.03	0.03	0.15-0.35	–	0.9-1.2	0.15-0.30

 

 

Properties	Metric	Imperial
Tensile strength	655 MPa	95000 psi
Yield strength	415 MPa	60200 psi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Elastic modulus	190-210 GPa	27557-30458 ksi
Poisson's ratio	0.27-0.30	0.27-0.30
Elongation at break (in 50 mm)	25.70%	25.70%
Hardness, Brinell	197	197
Hardness, Knoop (converted from Brinell NMness)	219	219
Hardness, Rockwell B (converted from Brinell NMness)	92	92
Hardness, Rockwell C (converted from Brinell NMness. Value below normal HRC range, for comparison purposes only)	13	13
Hardness, Vickers (converted from Brinell NMness)	207	207
Machinability (based on AISI 1212 as 100 machinability)	65	65

 

 

Annealing:Heat ASTM 4140 steel to 800 oC - 850 oC, hold until temperature is uniform throughout the section, then cool in the furnace.

Normalizing:Alloy steel 4140 is heated to 870oC - 900oC, held until temperature is uniform throughout the section, immersed for 10 - 15 minutes and cooled in still air.

Tempering:Reheat Grade 4140 steel to 550 deg C - 700 deg C as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section and cool in still air.

 

 

 

 

 

 

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