What is the difference between 4140 and 5140 steel pipes?

What is the difference between 4140 and 5140 steel pipes?
After quenching and tempering, 5140 steel pipes can be used to manufacture mechanical parts under medium load and medium speed, such as car steering knuckles, rear half shafts, and gears, shafts, worms, spline shafts, top sleeves on machine tools, etc.

SAE-AISI 4140 Steel vs. SAE-AISI 5140 Steel
After quenching and tempering at medium temperature, 5140 steel pipes can be used to manufacture parts that withstand higher loads, impacts, and medium speeds, such as gears, spindles, oil pump rotors, sliders, collars, etc.; 5140 steel pipes are quenched and low temperature After tempering, it can be used to manufacture parts such as worms, spindles, shafts, collars, etc., which bear a heavy load, low impact, wear resistance, and have a solid thickness of 25mm or less on the section.

What is 40cr steel?
After quenching and tempering and high-frequency surface hardening, 5140 steel pipes can be used to manufacture parts with high hardness and wear resistance without great impacts, such as gears, sleeves, shafts, main shafts, crankshafts, spindles, pins Subs, connecting rods, screws, nuts, intake valves, etc.

What is the difference between SCr440 and SCr420 steel?
JIS SCr440 SCr420 pipe is used to process machine tool transmission gears, gear shafts, cams, worms, piston pins, claw clutches, etc.
In addition, the JIS SCr440 SCr420 pipe can also be used to manufacture various transmission parts for carbonitriding, such as gears and shafts with larger diameters and good low-temperature toughness.

JIS SCr440 pipe, 40Cr 20Cr pipes, DIN 1.7045 flange, DIN 42Cr4 pipe, BS 524A14 elbow, BS 530A40 pipe bending, UNI 105WCR5 flange, UNI 41Cr4 elbows, AISI 5140 fittings, SAE L1 elbows, SAE 5140 pipe, JIS SCr440H flanges, EN 41CrS4 pipe fittings, EN 1.7039 elbows, EN 1.7045 flanges, GOST 40KH pipes, GOST 40CH tubes, AFNOR 42C4TS pipe bending, SS 2245 fittings, UNE 42Cr4 flanges, SAE 5120 pipe, DIN 1.7035 flanges

General Infor:

JIS G4104 Grade SCr440
Density: 7.8-7.9 g/cm³

Mechanical property of 5140 steel pipes
Elastic modulus: 200.0-215.0 GPa
Poisson's ratio:0.29 [-]

Thermal of 5140 steel pipes
Coefficient of thermal expansion: 9.4e-06-1.5e-05 1/K
Melting point: 1382.0-1529.0°C
Specific heat capacity: 440.0-494.0 J/(kg·K)
Thermal conductivity: 23.0-50.0 W/(m·K)

Chemical Composition of 5140 steel pipes
Carbon: 0.38-0.43%
Chromium: 0.9-1.2%
Iron: 97.1099-97.9699%
Manganese: 0.6-0.85%
Phosphorus: 0.03%
Silicon: 0.15-0.35%
Sulfur: 0.03%

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