The difference between 42CrMo and 42CrMo4 steel pipes

The difference between 42CrMo and 42CrMo4 steel pipes
The function of 42CrMo4 steel pipes
42CrMo steel pipes are used to manufacture forgings with higher strength and larger quenched and tempered section, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods, and spring clamps that are heavily loaded, and can also be used below 2000m Oil deep well drill pipe joints and oil equipment tools, and can be used for molds of bending machines, etc.

What is 42CrMo?
42CrMo Steel Equivalent
SAE 4140 Alloy Steel Pipes, JIS G4105 Grade SCM440 vs SCM420 pipe, DIN 1.7223 flange, DIN 41CrMo4 tube fittings, AFNOR 42CD4TS pipes, BS 708M40 flanges, UNI 41CrMo4 pipes, SS 2244 flange, UNE 42CrMo4 pipe fittings, ASTM A519 AISI 4140 pipe, AISI 4142 fittings, SAE 4140 alloy pipe, SAE 4142 flange, EN 1.7223 elbows, ГOCT 38XM pipe

Is 42CrMo4 stainless steel?
Mechanical property of 42CrMo4 steel pipes
Density: 7.8 - 7.9g/cm³
Elastic modulus: 200.0-215.0 GPa
Poisson's ratio: 0.29

What is the difference between SCM440 and SCM420 steel?
Thermal of 42CrMo4 steel pipes
Coefficient of thermal expansion: 1.1e-05-1.4e-05 1/K
Melting point: 1382.0-1529.0°C
Specific heat capacity: 448.0-502.0 J/(kg·K)
Thermal conductivity: 36.0 - 43.0 W/(m·K)

What is the difference between 1045 and 4140 steel?
Chemical Composition of 42CrMo4 steel pipes
Carbon: 0.38-0.43%
Chromium: 0.9-1.2%
Iron: 96.8099-97.8199%
Manganese: 0.6-0.85%
Molybdenum: 0.15-0.3%
Phosphorus: 0.03%
Silicon: 0.15-0.35%
Sulfur: 0.03%

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