40CrNiMo alloy steel pipe

 Chemical composition:

Carbon C:0.37~0.44

Silicon Si:0.17~0.37

Manganese Mn:0.50~0.80

Sulfur S: less than 0.025

Phosphorus P: < 0.025

Chromium Cr:0.60~0.90

Nickel Ni:1.25~1.65

Copper Cu: less than 0.25

Molybdenum Mo:0.15~0.25

Mechanical properties of 40CrNiMo alloy steel pipe:

Tensile strength sigma B (MPa): 933~1011

Conditional yield strength of sigma 0.2 (MPa): 832~899

Elongation of delta 5 (%): 19~20

Cross section shrinkage rate (%): 53~64

Impact power Akv (J): 117

Impact toughness value alpha Ku (J/cm2): 144~172

Hardness: 274~303HB

Sample size: smooth specimen

 heat treatment specification:

Heat treatment specification: normalizing at 900 C, quenching at 850 C, tempering at 620 C, oil cooling.