The difference among steel pipe AISI 1045, steel pipe AISI 5140 and steel pipe AISI 4130

The difference among steel pipe AISI 1045, steel pipe AISI 5140 and steel pipe AISI 4130.

1. Steel pipe AISI 1045 is a high-quality carbon structural steel with a carbon content of 0.42-0.50%, a tensile strength of 610 MPa, and a yield point of 360 MPa; it is used for general shaft parts.
2. Steel pipe AISI 5140 is an alloy structural steel with a carbon content of 0.37-0.45%, a chromium content of 0.8-1.1%, a tensile strength of 1000 MPa, and a yield point of 800 MPa; it is used for load-bearing parts with larger loads.
3. Steel pipe AISI 4130 is an alloy structural steel with a carbon content of 0.38-0.45%, a chromium content of 0.9-1.2%, a molybdenum content of 0.15-0.25%, a tensile strength of 1100 MPa, and a yield point of 950 MPa. Use parts with heavy loads and high reliability.
4. The equivalent materials:
AISI 1045 equivalent materials: SAE 1045, JIS S45C, GOST 45, AFNOR C45, DIN C45K
AISI 5140 equivalent materials: DIN 1.7003, DIN 38Cr2, DIN 1.7035, DIN 41Cr4, AFNOR 38Cr2, AFNOR 41Cr4, SAE 5140, JIS SCr440
AISI 4130 equivalent materials:  DIN 1.7214, DIN 25CrMo4, SAE 4130
5. Steel pipe AISI 1045 medium carbon is a common material for shaft parts. It is inexpensive, and after quenching and tempering (or normalising), it achieves better cutting performance, higher strength, toughness, and other comprehensive mechanical properties. The surface hardness can reach 45～52HRC after quenching.
6. Steel pipe AISI 5140 alloy steel: Alloy structural steel is suitable for shaft parts with medium precision and high speed. After quenching and tempering and quenching, this type of steel has better comprehensive mechanical properties.
7. Steel pipe AISI 4130 alloy steel: high strength, hardenability, good toughness, small deformation during quenching, high creep strength, and enduring strength at high temperature.