EN 10217-7 Grade X2CrNiMoCuWN25-7-4 – Solution Annealed Steel for Corrosion‑Resistant Tubes

The austenitic ferritic steel X2CrNiMoCuWN25-7-4 is available in the solution annealed condition. Welded circular tubes of this steel are used for compression load and for corrosive load at room temperature, low temperatures and elevated temperatures. The material is resistant to intercrystalline corrosion (up to 380 °C) also in the welded condition.

Properties

General

Property	Temperature	Value
Density	20.0 °C	7.8 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	200 GPa
	100.0 °C	194 GPa
	200.0 °C	186 GPa
	300.0 °C	180 GPa

Elongation	20.0 °C	20 %
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Duplex Stainless Steel
Shear modulus	23.0 °C	77 GPa	Typical for Duplex Stainless Steel
Tensile strength	20.0 °C	800 - 1000 MPa
Yield strength Rp0.2	20.0 °C	550 MPa
	50.0 °C	502 MPa
	100.0 °C	450 MPa
	150.0 °C	420 MPa
	200.0 °C	400 MPa
	250.0 °C	380 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.3E-5 1/K
	200.0 °C	1.35E-5 1/K
	300.0 °C	1.4E-5 1/K

Max service temperature		300 °C	Typical for Duplex Stainless Steel
Melting point		1375 - 1450 °C	Typical for Duplex Stainless Steel
Specific heat capacity	20.0 °C	500 J/(kg·K)
Thermal conductivity	20.0 °C	15 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	8E-7 Ω·m

Chemical properties

Property	Value
Carbon	0.03 %
Chromium	24 - 26 %
Copper	0.5 - 1 %
Manganese	1 %
Molybdenum	3 - 4 %
Nickel	6 - 8 %
Nitrogen	0.2 - 0.3 %
Phosphorus	0.04 %
Silicon	1 %
Sulfur	0.015 %
Tungsten	0.5 - 1 %

EN 12163 Grade R440 CuZn39Mn1AlPbSi – Premium Unhardenable Copper Alloy EN 10217-7 Grade X2CrNiMoN25-7-4 Solution-Annealed Steel (+AT) – High-Temperature Corrosion Resistance

Metal