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EN 10028‑7 X5NiCrAlTi31‑20 +RA: Heat‑Resistant Austenitic Steel for Pressure Vessels

The austenitic steel X5NiCrAlTi31-20+RA (recrystallisation annealed) is a heat resistant material. The material is resistant to intercrystalline corrosion, not in the sensitized condition. Application: in pressure vessel and steam-boiler construction as well as in chemical and petrochemical industry

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.94 - 8 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

201 GPa

20.0 °C

194 - 200 GPa

100.0 °C

189 - 190 GPa

200.0 °C

183 - 185 GPa

300.0 °C

175 - 177 GPa

400.0 °C

170 GPa

500.0 °C

160 - 163 GPa

600.0 °C

155 - 156 GPa

700.0 °C

145 - 149 GPa

800.0 °C

140 - 141 GPa

900.0 °C

134 - 135 GPa

1000.0 °C

125 - 127 GPa

Elongation A80, transverse

20.0 °C

30 %

Elongation, transverse

20.0 °C

30 %

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

500 - 750 MPa

50.0 °C

487 MPa

100.0 °C

465 MPa

150.0 °C

445 MPa

200.0 °C

435 MPa

250.0 °C

425 MPa

300.0 °C

420 MPa

350.0 °C

418 MPa

400.0 °C

415 MPa

450.0 °C

415 MPa

500.0 °C

415 MPa

Tensile strength, transverse

20.0 °C

500 - 750 MPa

Yield strength Rp0.2

50.0 °C

199 MPa

100.0 °C

180 MPa

150.0 °C

170 MPa

200.0 °C

160 MPa

250.0 °C

152 MPa

300.0 °C

145 MPa

350.0 °C

137 MPa

400.0 °C

130 MPa

450.0 °C

125 MPa

500.0 °C

120 MPa

550.0 °C

115 MPa

600.0 °C

110 MPa

Yield strength Rp0.2, transverse

20.0 °C

210 MPa

Yield strength Rp1.0

50.0 °C

227 MPa

100.0 °C

205 MPa

150.0 °C

193 MPa

200.0 °C

180 MPa

250.0 °C

172 MPa

300.0 °C

165 MPa

350.0 °C

160 MPa

400.0 °C

155 MPa

450.0 °C

150 MPa

500.0 °C

145 MPa

550.0 °C

140 MPa

600.0 °C

135 MPa

Yield strength Rp1.0, transverse

20.0 °C

240 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.36E-5 1/K

20.0 °C

1.46E-5 1/K

100.0 °C

1.51E-5 - 1.54E-5 1/K

200.0 °C

1.57E-5 - 1.6E-5 1/K

300.0 °C

1.62E-5 - 1.65E-5 1/K

400.0 °C

1.66E-5 - 1.68E-5 1/K

500.0 °C

1.7E-5 - 1.72E-5 1/K

600.0 °C

1.74E-5 - 1.75E-5 1/K

700.0 °C

1.77E-5 - 1.79E-5 1/K

800.0 °C

1.8E-5 - 1.83E-5 1/K

900.0 °C

1.83E-5 - 1.86E-5 1/K

1000.0 °C

1.86E-5 - 1.9E-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

460 - 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

11.5 - 12 W/(m·K)

100.0 °C

13.1 W/(m·K)

200.0 °C

14.8 W/(m·K)

300.0 °C

16.4 W/(m·K)

400.0 °C

18.1 W/(m·K)

500.0 °C

19.6 W/(m·K)

600.0 °C

21.2 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

27.3 W/(m·K)

Thermal diffusivity

20.0 °C

3.1 mm²/s

100.0 °C

3.3 mm²/s

200.0 °C

3.6 mm²/s

300.0 °C

3.9 mm²/s

400.0 °C

4.2 mm²/s

500.0 °C

4.4 mm²/s

600.0 °C

4.6 mm²/s

700.0 °C

4.9 mm²/s

800.0 °C

5.2 mm²/s

900.0 °C

5.5 mm²/s

1000.0 °C

5.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

9.9E-7 - 1.01E-6 Ω·m

100.0 °C

1.04E-6 Ω·m

200.0 °C

1.08E-6 Ω·m

300.0 °C

1.12E-6 Ω·m

400.0 °C

1.15E-6 Ω·m

500.0 °C

1.18E-6 Ω·m

600.0 °C

1.2E-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

1.27E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

0.2 - 0.5 %

Carbon

0.03 - 0.08 %

Chromium

19 - 22 %

Cobalt

0.5 %

Copper

0.5 %

Manganese

1.5 %

Nickel

30 - 32.5 %

Niobium

0.1 %

Nitrogen

0.03 %

Phosphorus

0.02 %

Silicon

0.7 %

Sulfur

0.01 %

Titanium

0.2 - 0.5 %


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