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DIN 17440 Grade X2CrNiMo18-15-4 Quenched Steel: Superior Corrosion Resistance & Formability

The for pressure vessels approved steel X2CrNiMo18-15-4, mat. no. 1.4438, shows very good resistance to not oxidising media and halogenated media because of the high amount of Mo, is high polishable and good cold formable is resistant to intercrystalline corrosion in the delivery condition up to 6 mm thickness or up to 40 mm diameter and also in the welded condition, but the corrosion resistance is varying because of chemical composition and the welding conditions. Acc. DIN 17440 : 1996-09 it is used for flat products and rods and drawn wire and acc. DIN 17441 : 1997-02 for cold rolled strips and slit strips for pressure vessels. The limiting application temperature (operating time 100000 h, no intercrystalline corrosion) amounts to 350 degrees C. For the application acc. DIN 17440 : 1985-07 (X 5 CrNiMo 17 12 2) resp. acc. DIN EN 10088-1,-2,-3 : 1995-08 applies: application for acid resistant apparatus in the chemical and pharmaceutical industry, cellulose industry, textile industry and in the tankship building.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8 - 8.01 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

206 GPa

20.0 °C

196 - 200 GPa

100.0 °C

190 - 194 GPa

200.0 °C

182 - 186 GPa

300.0 °C

174 - 179 GPa

400.0 °C

166 - 172 GPa

500.0 °C

158 - 165 GPa

600.0 °C

150 GPa

700.0 °C

142 GPa

800.0 °C

134 GPa

Elongation

20.0 °C

35 %

Elongation A80

20.0 °C

35 %

Elongation A80, transverse

20.0 °C

40 %

Poisson's ratio

20.0 °C

0.28 [-]

Shear modulus

20.0 °C

77.3 GPa

Tensile strength

20.0 °C

490 - 690 MPa

Tensile strength, transverse

20.0 °C

490 - 690 MPa

Yield strength Rp0.2

20.0 °C

195 MPa

50.0 °C

186 MPa

100.0 °C

172 MPa

150.0 °C

157 MPa

200.0 °C

147 MPa

250.0 °C

137 MPa

300.0 °C

127 MPa

350.0 °C

120 MPa

400.0 °C

115 MPa

450.0 °C

112 MPa

500.0 °C

110 MPa

550.0 °C

108 MPa

Yield strength Rp0.2, transverse

20.0 °C

195 MPa

Yield strength Rp1.0

20.0 °C

230 MPa

50.0 °C

221 MPa

100.0 °C

206 MPa

150.0 °C

186 MPa

200.0 °C

177 MPa

250.0 °C

167 MPa

300.0 °C

156 MPa

350.0 °C

148 MPa

400.0 °C

144 MPa

450.0 °C

140 MPa

500.0 °C

138 MPa

550.0 °C

136 MPa

Yield strength Rp1.0, transverse

20.0 °C

230 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

1.65E-5 - 1.67E-5 1/K

200.0 °C

1.72E-5 - 1.75E-5 1/K

300.0 °C

1.77E-5 - 1.8E-5 1/K

400.0 °C

1.81E-5 - 1.85E-5 1/K

500.0 °C

1.84E-5 - 1.9E-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

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

13.5 - 14 W/(m·K)

100.0 °C

14.9 W/(m·K)

200.0 °C

16.7 W/(m·K)

300.0 °C

18.3 W/(m·K)

400.0 °C

19.8 W/(m·K)

500.0 °C

21.3 W/(m·K)

600.0 °C

22.7 W/(m·K)

700.0 °C

24.2 W/(m·K)

800.0 °C

25.6 W/(m·K)

Thermal diffusivity

20.0 °C

3.6 mm²/s

100.0 °C

3.7 mm²/s

200.0 °C

4 mm²/s

300.0 °C

4.4 mm²/s

400.0 °C

4.6 mm²/s

500.0 °C

4.7 mm²/s

600.0 °C

4.9 mm²/s

700.0 °C

5.2 mm²/s

800.0 °C

5.5 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

7.75E-7 - 8.5E-7 Ω·m

100.0 °C

8.42E-7 Ω·m

200.0 °C

9.04E-7 Ω·m

300.0 °C

9.62E-7 Ω·m

400.0 °C

1.01E-6 Ω·m

500.0 °C

1.06E-6 Ω·m

600.0 °C

1.1E-6 Ω·m

700.0 °C

1.13E-6 Ω·m

800.0 °C

1.16E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.03 %

Chromium

17.5 - 19.5 %

Manganese

2 %

Molybdenum

3 - 4 %

Nickel

13 - 16 %

Nitrogen

0.11 %

Phosphorus

0.05 %

Silicon

1 %

Sulfur

0.015 %


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