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EN 10216‑5 Grade X1NiCrMoCuN25‑20‑7 – Solution Annealed Steel for Pressure Vessels & Nuclear Applications

Steel X1NiCrMoCuN25-20-7 (acc. to VdT_V-material specification 502 : 2001-06: X 1 NiCrMoCuN 25 20 6 ), material number 1.4529, is used acc. to VdT_V-Wbl 502 : 2001-06 for pressure vessels as per TRB 100 and AD-data sheet W 2 from -10 (and AD-data sheet W 10 for the form of manufacture sheet and Krupp-VDM-sectional and bar steel/forged parts from -196 deg.) to 400 deg. as well as in nuclear power engineering as far as nuclear rules or object-related specifications permit application for pressure vessels. The weldability is given for the metal-arc welding and gas-shielded welding. Preheating is not necessary. The intermediate layer temperature should not exceed 120 deg. Heat treatment (solution annealing and quenching) after the welding only in special cases necessary (special corrosion stress). As filler materials following metals are recommended: e.g. 2.4621 (EL-NiCr21Mo9Nb), 2.4831 (SG-NiCr21Mo9Nb), 2.4607 (SG-NiCr23Mo16 and 2.4611 (SG-NiMo16Cr16Ti). The two last-mentioned should preferred because of their corrosion properties. The material is cold and hot formable. To the material acc. to DIN EN 10216-5 : 2004-11 applies: X1NiCrMoCuN25-20-7 is the stronger Mo-alloyed variant of 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 steel pitting index. The material is resistant to intercrystalline corrosion, also in welded condition. Application in higher chloride contaminated media, such as in sulphuric and phosphoric acid as well as in offshore facilities. The steel is cold and warm formable. After cold forming at deformation degrees > 15 % as well as after warm forming has to be carried out a heat treatment (solution annealing at 1100 to 1180, quenching in water).

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

20.0 °C

35 %

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

600 - 800 MPa

Tensile strength, transverse

20.0 °C

600 - 800 MPa

Yield strength Rp0.2

20.0 °C

270 MPa

50.0 °C

254 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

Yield strength Rp0.2, transverse

20.0 °C

270 MPa

Yield strength Rp1.0

20.0 °C

310 MPa

50.0 °C

296 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

Yield strength Rp1.0, transverse

20.0 °C

310 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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