Seamless Steel Tube Library: ASTM 4340 Seamless Steel Tube Chemical Composition and Mechanical Properties
Hit：192026-07-09 10:22:19
Seamless Steel Tube Library: ASTM 4340 Seamless Steel Tube Chemical Composition and Mechanical Properties
Mechanical properties:
Tensile strength σ b (MPa): ≥ 980 (100)
Yield strength σ s (MPa): ≥ 835 (85)
Elongation rate δ 5 (%): ≥ 12
Shrinkage rate of cross-section (%): ≥ 55
Impact energy Akv (J): ≥ 78
Impact toughness value α kv (J/cm2): ≥ 98 (10)
Hardness: ≤ 269HB
Sample size: The sample blank size is 25mm
Heat treatment specifications and metallographic structure:
Heat treatment specifications: quenching at 850 ℃, oil cooling; Tempered at 600 ℃, water-cooled or oil cooled.
Delivery status: Delivery shall be made in a heat-treated (normalizing, annealing, or high-temperature tempering) or non heat-treated state, and the delivery status shall be specified in the contract.
Execution standard: ASTM A29/A29M-04
● Chemical composition:
Manganese Mn: 0.60-0.90
Sulfur S: allowable residual content ≤ 0.040
Phosphorus P: allowable residual content ≤ 0.035
Chromium Cr: 0.60-0.90
Nickel Ni: 1.65-2.00
Copper Cu: allowable residual content ≤ 0.025
Molybdenum Mo: 0.20-0.30
