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SEW 470 X8CrNi25-21 Solution‑Annealed Alloy – High‑Temperature, Nitrogen‑Resistant Grade

Application for parts in industrial furnaces, steam boiler, petroleum plants, for thermometer sheath tubes. Best resistance to nitrogenous, oxygen deficient gases. Heat-resistance in air up to 1050°C. (highest application temperature).

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.76 - 7.9 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-269.0 °C

205.5 GPa

-195.0 °C

205.5 GPa

-100.0 °C

206 GPa

20.0 °C

196 GPa

27.0 °C

143.7 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

20.0 °C

35 %

Elongation A80

20.0 °C

33 %

Hardness, Brinell

20.0 °C

192 [-]

Poisson's ratio

-269.0 °C

0.3 [-]

-195.0 °C

0.3 [-]

27.0 °C

0.29 [-]

Shear modulus

23.0 °C

77 GPa

Typical for Austenitic Stainless Steel

Tensile strength

20.0 °C

500 - 700 MPa

Yield strength Rp0.2

20.0 °C

210 MPa

Yield strength Rp1.0

20.0 °C

250 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

1.67E-5 1/K

200.0 °C

1.55E-5 - 1.72E-5 1/K

300.0 °C

1.77E-5 1/K

400.0 °C

1.7E-5 - 1.81E-5 1/K

500.0 °C

1.84E-5 1/K

600.0 °C

1.75E-5 - 1.88E-5 1/K

700.0 °C

1.91E-5 1/K

800.0 °C

1.85E-5 - 1.94E-5 1/K

900.0 °C

1.97E-5 1/K

1000.0 °C

1.9E-5 - 2E-5 1/K

Max service temperature, long

0 - 1050 °C

Melting point

1230 - 1480 °C

Typical for Austenitic Stainless Steel

Specific heat capacity

-100.0 °C

440 J/(kg·K)

20.0 °C

472 - 500 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 - 15 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 - 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

8.5E-7 - 9.59E-7 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

0.1 %

Chromium

24 - 26 %

Manganese

2 %

Nickel

19 - 22 %

Nitrogen

0.11 %

Phosphorus

0.05 %

Silicon

1.5 %

Sulfur

0.015 %


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