Steel grade of SAE 4140 JIS SCM440 pipes

Steel grade of SAE 4140 JIS SCM440 pipes
The equivalent materials: DIN 42CrMo4, AISI 4140, 42CrMo
(similar materials as SAE 4142, SAE 4140H, AISI 4140H, DIN 1.7225,DIN 42CrMo4V,ASTM A1031 Grade G41450, GOST 38ChM, JIS SCM440M, EN 1.7231, JIS SCM440H, UNS G41400, UNS H41400, UNS H41420, UNS G41420, JIS SNB7, ASTM A1031 Grade 4145, ASTM A1031 Grade G41470, ASTM A1031 Grade 4147, AFNOR 42CD4, S 708M40, UNE F.125, BS 709M40, SS 2244, BS EN19)

1. Features and scope of application:
High strength, hardenability, good toughness, small deformation during quenching, high creep strength, and lasting strength at high temperature. It is used to manufacture forgings that require higher strength and larger quenched and tempered section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods, and spring clips that are heavily loaded, and can also be used Drill pipe joints and fishing tools for oil deep wells below 2000m.
2. Chemical composition of SAE 4140 JIS SCM440 pipes:
Carbon C: 0.38～0.45
Silicon Si: 0.17～0.37
Manganese Mn: 0.50～0.80
Sulfur S: Allow residual content ≤0.035
Phosphorus P: allowable residual content≤0.035
Chromium Cr: 0.90～1.20
Nickel Ni: allowable residual content ≤0.030
Copper Cu: allowable residual content ≤0.030
Mo: 0.15～0.25
3. Mechanical properties:
Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥930(95)
Elongation δ5 (%): ≥12
Reduction of area ψ (%): ≥45
Impact energy Akv (J): ≥63
Impact toughness value αkv (J/cm2): ≥78(8)
Hardness: ≤217HB
Sample size: sample blank size is 25mm
4. Heat treatment specification and metallographic structure of SAE 4140 JIS SCM440 pipes:
Heat treatment specification: quenching 850℃, oil cooling; tempering 560℃, water cooling, oil cooling.
Metallographic structure: tempered sorbite.
5. Delivery status of SAE 4140 JIS SCM440 pipes:
The delivery in the state of heat treatment (normalizing, annealing, or high-temperature tempering) or without heat treatment, the delivery status should be indicated in the contract.
6. The available stocks of SAE 4140 JIS SCM440 pipes from PETROL STEEL CO., LTD.
365*45, 365*85,
377*55, 377*60, 377*65, 377*70,
402*60, 402*65, 402*70, 402*75,
426*60, 426*65, 426*70, 426*75