What is AISI 5140 steel ?

ASTM grade 5140 is one structural alloy steel grade in ASTM A29 standard for general application. 5140 steel plate is widely used in low and moderately stressed parts for vehicles, engines and machines where hard, wear resisting surface is needed. Futai is professional 5140 plate & round bar supplier and we keep wide size range for 5140 plate in stock for immediate shipment. Contact us for any AISI 5140 plate material request and best 5140 grade steel price.

Competitive Advantage for AISI 5140 material steel plate in Futai:

• Available in stock for immediate shipment
• High strength,
• High tenacity
• Good hardenability
• High resistance to thermal properties.
• Competitive price

  1. Supply Range of AISI/ASTM 5140

  Round Bar: diameter 20mm – 300mm

  Steel Plate and Steel Block: thickness 10-200mm x width 300-2000mm

  • 10-80mm thickness 5140 plate are available all the time in stock,
  • 90-200mm thickness plate to be newly production in 15-30 days lead time.

  Surface Finish: Black Surface, Milled Surface or Polished Surface as per given requirements.

  2. Relevant AISI 5140 Specification and Equivalent Steel Grades

  Country	USA	German	Japan
  Standard	ASTM/AISI A29	EN 10083-3	JIS G4053
  Grades	5140	41Cr4	SCr440

  3. ASTM 5140 Material Chemical Composition and Equivalent

  Standard	Grade/Steel Number	C	Mn	P	S	Si	Cr	Ni
  ASTM A29	5140	0.38-0.43	0.70-0.90	≤0.035	≤0.040	0.15-0.35	0.70-0.90	–
  EN 10083-3	41Cr4 / 1.7035	0.38-0.45	0.60-0.90	≤0.025	≤0.035	≤0.40	0.90-1.20	–
  JIS G4053	SCr440	0.38-0.43	0.60-0.90	≤0.030	≤0.030	0.15-0.35	0.90-1.20	≤0.25

  4. AISI 5140 Steel Properties

  Property	Value in metric unit		Value in US unit
  Density	7.872 *10³	kg/m³	491.4	lb/ft³
  Modulus of elasticity	205	GPa	29700	ksi
  Thermal expansion (20 ºC)	12.6*10-6	ºCˉ¹	7.00*10-6	in/(in* ºF)
  Specific heat capacity	452	J/(kg*K)	0.108	BTU/(lb*ºF)
  Thermal conductivity	44.7	W/(m*K)	310	BTU*in/(hr*ft²*ºF)
  Electric resistivity	2.28*10-7	Ohm*m	2.28*10-5	Ohm*cm
  Tensile strength (annealed)	572	MPa	83000	psi
  Yield strength (annealed)	293	MPa	42500	psi
  Elongation (annealed)	29	%	29	%
  Hardness (annealed)	85	RB	85	RB
  Tensile strength (normalized)	793	MPa	115000	psi
  Yield strength (normalized)	472	MPa	68500	psi
  Elongation (normalized)	23	%	23	%
  Hardness (normalized)	98	RB	98	RB

  5. Forging of 5140 Alloy Steel

  Hot forming temperature: 1050-850℃.

  6. ASTM 5140 Steel Heat Treat

  • Soft Annealing

  Heat to 680-720℃, cool slowly. This will produce a maximum 5140 hardness of 241HB (Brinell hardness).

  • Noramlizing of steel grade 5140

  Temperature: 840-880℃.

  • Hardening of 5140 forged steel

  Harden from a temperature of 820-850, 830-860℃ followed by water or oil quenching.

  • Tempering of SAE 5140 material

  Tempering temperature: 540-680℃.

  7. Applications of AISI Grade 5140 

  AISI 5140 steel can be used for low and moderately stressed parts for vehicles, engines and machines where hard, wear resisting surface is needed. Hardness as surface hardened about 54 HRC. SAE 5140 steels can also be for marine engineering industry, chemical processing plants, boiler & pressure vessels, nuclear power plants etc.

  If you have queries about the 5140 specs, or any questions about the 5140 vs 4130, 5140 vs 4340 etc, please contact us for technical support any time.