1.4871, DIN X53CrMnNiN21-9, SAE EV8

 1.4871, DIN X53CrMnNiN21-9, SAE EV8

Designation by Standards

 

Chemical Composition (in weight %)

Description
A nitrogen-strengthened, austenitic valve steel.

Applications
Has been used extensively for automotive valve applications.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 215
Density [g/cm³]: 7.7
Thermal conductivity [W/m.K]: 14.5
Electric resistivity [Ohm mm²/m]: 0.79
Specific heat capacity[J/g.K]: 0.50

Coefficient of Linear Thermal Expansion 10^{-6 o}C^-1

Hardening
Harden from a temperature of 1180-1140^oC followed by water quenching.

Tempering
Tempering temperature: 730-780^oC, air.

Mechanical properties at ambient temperature
Condition: Precipitation hardened
Hardness: 32 HRC
0.2 % proof stress: 580 N/mm²
Tensile strength: 950-1200 N/mm²
Elongation: 8 %
Reduction: 10 %

Tensile Strength (N/mm²) vs. Temperature (^oC)

0.2 % proof stress (N/mm²) vs. Temperature (^oC)

Forging
Hot forming temperature: 1100-950^oC.

Machinability
The machining properties of this steel are comparable to the standard 18-8 stainless steels, such as types 302, 304, etc.