--21th.September.2023--
4140 forged alloy steel round bar with Q+T(Quenching+Tempering,hardness 28HRC - 32HRC) condition finished production . Total weight 25.76Tons. Now ready to deliver to Shanghai Sea port to load in a 20ft container.
SAE 4140 (AISI 4140 steel) is a low alloy steel of the Cr Mo series (chromium molybdenum series), which has high strength and hardenability, good toughness, small quenching deformation, high creep strength, and high-temperature endurance strength.
4140 Steel Applications
AISI SAE 4140 alloy steel can be used as round bars, flat and square bars, plates, and pipes. It has various applications in the aerospace, oil and gas, and automotive industries. Typical applications include thin-walled pressure vessels, forged gears and shafts (motor shafts, pump shafts, hydraulic shafts, etc.), spindles (lathe spindles, milling spindles, etc.), collars, fixtures, high-strength bolts, valve covers, screws, nuts, worms, chucks, etc Torsion bars and various carburized parts.
Chemical Compositions:
Carbon C: 0.38-0.43
Silicon Si: 0.15-0.35
Manganese Mn: 0.75-1.00
Sulfur S: allowable residual content ≤ 0.040
Phosphorus P: allowable residual content ≤ 0.030
Chromium Cr: 0.80-1.10
Nickel Ni: allowable residual content ≤ 0.030
Copper Cu: allowable residual content ≤ 0.030
Molybdenum Mo: 0.15~0.25
Mechanical Property
Reduction of area ψ (%): ≥ 45
Impact energy Akv (J): ≥ 63
Impact toughness value α KV (J/cm2): ≥ 78 (8)
Hardness: ≤ 217HB
