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EN 10028-7 Grade X1NiCrMoCuN25-20-7 Solution Annealed (AT) – High-Performance Austenitic Steel

The austenitic steel X1NiCrMoCuN25-20-7 is the stronger Mo-alloyed type of the 1.4539. The steel shows a very high resistance to crevice corrosion, pitting corrosion as well as to stress corrosion caused by pitting corrosion. It has the highest pitting index with 46. The material is resistant to intercrystalline corrosion, even in welded condition. Application: in higher chloride-contaminated media, e.g. in appropriate sulphur and phosphorus acids, furthermore in offshore engineering

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.76 - 8.1 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

206 GPa

20.0 °C

195 - 196 GPa

100.0 °C

190 GPa

200.0 °C

182 GPa

300.0 °C

174 GPa

400.0 °C

166 GPa

500.0 °C

158 GPa

600.0 °C

150 GPa

700.0 °C

142 GPa

800.0 °C

134 GPa

900.0 °C

127 GPa

1000.0 °C

120 GPa

Elongation A80, transverse

20.0 °C

40 %

Elongation, transverse

20.0 °C

40 %

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Austenitic Stainless Steel

Shear modulus

23.0 °C

77 GPa

Typical for Austenitic Stainless Steel

Tensile strength

20.0 °C

650 - 850 MPa

50.0 °C

612 MPa

100.0 °C

550 MPa

150.0 °C

535 MPa

200.0 °C

520 MPa

250.0 °C

500 MPa

300.0 °C

480 MPa

350.0 °C

475 MPa

Tensile strength, transverse

20.0 °C

650 - 850 MPa

Yield strength Rp0.2

50.0 °C

274 MPa

100.0 °C

230 MPa

150.0 °C

210 MPa

200.0 °C

190 MPa

250.0 °C

180 MPa

300.0 °C

170 MPa

350.0 °C

165 MPa

400.0 °C

160 MPa

450.0 °C

130 MPa

500.0 °C

120 MPa

550.0 °C

105 MPa

Yield strength Rp0.2, transverse

20.0 °C

300 MPa

Yield strength Rp1.0

50.0 °C

314 MPa

100.0 °C

270 MPa

150.0 °C

245 MPa

200.0 °C

225 MPa

250.0 °C

215 MPa

300.0 °C

205 MPa

350.0 °C

195 MPa

400.0 °C

190 MPa

450.0 °C

160 MPa

500.0 °C

150 MPa

550.0 °C

135 MPa

Yield strength Rp1.0, transverse

20.0 °C

320 - 340 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.49E-5 1/K

20.0 °C

1.61E-5 1/K

100.0 °C

1.58E-5 - 1.67E-5 1/K

200.0 °C

1.61E-5 - 1.72E-5 1/K

300.0 °C

1.65E-5 - 1.77E-5 1/K

400.0 °C

1.69E-5 - 1.81E-5 1/K

500.0 °C

1.73E-5 - 1.84E-5 1/K

600.0 °C

1.88E-5 1/K

700.0 °C

1.91E-5 1/K

800.0 °C

1.94E-5 1/K

900.0 °C

1.97E-5 1/K

1000.0 °C

2E-5 1/K

Melting point

1230 - 1480 °C

Typical for Austenitic Stainless Steel

Specific heat capacity

-100.0 °C

440 J/(kg·K)

20.0 °C

450 - 472 J/(kg·K)

100.0 °C

487 J/(kg·K)

200.0 °C

503 J/(kg·K)

300.0 °C

512 J/(kg·K)

400.0 °C

520 J/(kg·K)

500.0 °C

530 J/(kg·K)

600.0 °C

541 J/(kg·K)

700.0 °C

551 J/(kg·K)

800.0 °C

559 J/(kg·K)

900.0 °C

565 J/(kg·K)

1000.0 °C

571 J/(kg·K)

Thermal conductivity

20.0 °C

11.9 - 12 W/(m·K)

100.0 °C

13.3 W/(m·K)

200.0 °C

15.1 W/(m·K)

300.0 °C

16.7 W/(m·K)

400.0 °C

18.3 W/(m·K)

500.0 °C

19.8 W/(m·K)

600.0 °C

21.3 W/(m·K)

700.0 °C

22.8 W/(m·K)

800.0 °C

24.3 W/(m·K)

900.0 °C

25.7 W/(m·K)

1000.0 °C

27.1 W/(m·K)

Thermal diffusivity

20.0 °C

3.3 mm²/s

100.0 °C

3.4 mm²/s

200.0 °C

3.7 mm²/s

300.0 °C

4.1 mm²/s

400.0 °C

4.3 mm²/s

500.0 °C

4.5 mm²/s

600.0 °C

4.7 mm²/s

700.0 °C

5 mm²/s

800.0 °C

5.4 mm²/s

900.0 °C

5.7 mm²/s

1000.0 °C

5.8 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

9.59E-7 - 1E-6 Ω·m

100.0 °C

1.01E-6 Ω·m

200.0 °C

1.05E-6 Ω·m

300.0 °C

1.1E-6 Ω·m

400.0 °C

1.13E-6 Ω·m

500.0 °C

1.17E-6 Ω·m

600.0 °C

1.19E-6 Ω·m

700.0 °C

1.22E-6 Ω·m

800.0 °C

1.24E-6 Ω·m

900.0 °C

1.26E-6 Ω·m

1000.0 °C

1.28E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.02 %

Chromium

19 - 21 %

Copper

0.5 - 1.5 %

Manganese

1 %

Molybdenum

6 - 7 %

Nickel

24 - 26 %

Nitrogen

0.15 - 0.25 %

Phosphorus

0.03 %

Silicon

0.5 %

Sulfur

0.01 %


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