EN 10090 X53CrMnNiN21-9: Solution Heat‑Treated & Precipitation Hardened Valve Steel – Superior Corrosion Resistance

X53CrMnNiN21-9 is an austenitic Cr-Mn-Ni-N-alloyed valve steel. The steel shows very high corrosion resistance in exhaust condensate and to lead compounds at increased temperatures. Use: inlet valves, exhaust valves, valves

Properties

General

Property	Temperature	Value
Density	20.0 °C	7.8 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	205 GPa
Elongation	20.0 °C	8 %
Hardness, Rockwell C	20.0 °C	30 [-]
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Austenitic Stainless Steel
Reduction of area	20.0 °C	10 %
Shear modulus	23.0 °C	77 GPa	Typical for Austenitic Stainless Steel
Tensile strength	20.0 °C	950 - 1200 MPa
	500.0 °C	650 MPa
	550.0 °C	600 MPa
	600.0 °C	550 MPa
	650.0 °C	500 MPa
	700.0 °C	450 MPa
	750.0 °C	370 MPa
	800.0 °C	300 MPa

Yield strength Rp0.2	20.0 °C	580 MPa
	500.0 °C	350 MPa
	550.0 °C	330 MPa
	600.0 °C	300 MPa
	650.0 °C	270 MPa
	700.0 °C	250 MPa
	750.0 °C	230 MPa
	800.0 °C	200 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.55E-5 1/K
	300.0 °C	1.75E-5 1/K
	500.0 °C	1.85E-5 1/K
	700.0 °C	1.88E-5 1/K

Melting point		1230 - 1480 °C	Typical for Austenitic Stainless Steel
Specific heat capacity	20.0 °C	500 J/(kg·K)
Thermal conductivity	20.0 °C	14.5 W/(m·K)

Electrical

Property	Temperature	Value	Comment
Electrical resistivity	23.0 °C	8.5E-7 Ω·m	Typical for Austenitic Stainless Steel

Chemical properties

Property	Value
Carbon	0.48 - 0.58 %
Chromium	20 - 22 %
Manganese	8 - 10 %
Nickel	3.25 - 4.5 %
Nitrogen	0.35 - 0.5 %
Phosphorus	0.05 %
Silicon	0.25 %
Sulfur	0.03 %

EN 10090 Grade X50CrMnNiNbN21-9: High-Performance Valve Steel – Solution Heat‑Treated & Precipitation Hardened (+AT+P) EN 10090 X53CrMnNiNbN21‑9 Valve Steel – Solution Heat‑Treated & Precipitation Hardened (+AT+P)

Metal