What is 1.4021 material equivalent standard?

What is 1.4021 material equivalent standard?
China National Standard (GB-T Standard): S42020,
The new grade is 20Cr13, and the old grade is 2Cr13.
American Standard (ASTMA Standard): S42000.
Japanese Standard (JIS Standard): SUS420J1.
German Standard (DIN Standard): 1.4021.
European Standard (EN Standard): X20Cr13.

‌1.4021 stainless steel machinability?
1.4021 stainless steel is a martensitic stainless steel that complies with European standards (EN) and has good machinability and high hardness. In an inert state, 1.4021 stainless steel is suitable for machining, stamping, bending and other mechanical processing, and is easy to process and cut.

1.4021 stainless steel  Chemical composition:
- Carbon (C): 0.16~0.25%
- Silicon (Si): ≤1.00%
- Manganese (Mn): ≤1.00%
- Phosphorus (P): ≤0.040%
- Sulfur (S): ≤0.015%
- Chromium (Cr): 12.00~14.00%

 1.4021 stainless steel Mechanical properties
Tensile strength: 650-850 MPa
Yield strength: ≥440 MPa
Elongation: ≥15%
Rockwell hardness (HRC): 50-55
Sectional reduction rate ≥50%,
Impact energy ≥78.4 J

1.4021 stainless steel Physical properties

Density: 7.7-7.8 g/cm³
Melting point: 1450-1510°C
Specific heat capacity: 460 J/kg·K
Thermal conductivity: 24.9 W/m·K (at 20°C)
Resistivity: 5.5 × 10^-7 Ω·m
Modulus of elasticity: 200 GPa

1.4021 stainless steel  Heat treatment:
After hot working, 1.4021 stainless steel usually needs to be heat treated to obtain the required mechanical properties.
Quenching: Heating to 950-1050°C and then rapidly cooling (usually water or oil cooling) to obtain a martensitic structure.
Tempering: Tempering is carried out after quenching, and the tempering temperature is usually 600-750°C. The purpose of tempering is to reduce hardness, increase toughness and reduce brittleness.

1.4021 stainless steel  Application areas:

including the manufacture of various precision machinery, bearings, electrical equipment, instruments, meters, turbine blades, springs, cutting tools, nozzles, valve seats, valve bearings, medical equipment, etc. that are resistant to corrosion by the atmosphere, water vapor, water and oxidizing acids.