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EN 10088‑1 X3CrNb17 Soft‑Annealed Grade (+A): Premium Ferritic Steel for Boiler Applications

Material X 8 CrNb 17 (X3CrNb17), mat. number 1.4511 is acc. to VdTÜV-Wbl 422 : 2001-06 used for design certificated pocket boilers and helical tubes for boilers of the Viessmann Werke KG, Allendorf, with a max. material temperature of 200 °C. To the material acc. to DIN EN 10088-1 : 1995-08 applies: trademark X3CrNb17 is comparable to X 6 CrNb 17 nach DIN 17441 : 1985-07 (here higher C-content!). This material is a ferritic steel with the same corrosion properties as 1.4510. It shows increased stress corrosion resistance in bases and low chloride containing water. It is largely resistant in water, steam, weak acids and bases as well as in oxidizing acids. Resistance to intercrystalline corrosion both in delivery and welded condition. The steel is suitable for mirror finishing. Application for welded components in washing machines (alkaline tank) and in chemical apparatus engineering (weak acids), in dairy, food, brewery, dyeing and soap industry. In construction trade X3CrNb17 is used for decorative components to be welded in interior design, such as racks, frames, interior decoration elements. A metallic clean surface is a basic requirement for good corrosion resistance.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.56 - 7.7 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

218 - 220 GPa

100.0 °C

213 - 215 GPa

200.0 °C

206 - 210 GPa

300.0 °C

198 - 205 GPa

400.0 °C

190 - 195 GPa

500.0 °C

180 GPa

600.0 °C

167 GPa

700.0 °C

150 GPa

Elongation

20.0 °C

8 - 23 %

Elongation A80

20.0 °C

23 %

Elongation A80, transverse

20.0 °C

23 %

Elongation, transverse

20.0 °C

23 %

Hardness, Brinell

20.0 °C

200 [-]

Hardness, Brinell, trans

20.0 °C

200 [-]

Poisson's ratio

23.0 °C

0.3 [-]

Typical for Ferritic Stainless Steel

Shear modulus

23.0 °C

77 GPa

Typical for Ferritic Stainless Steel

Tensile strength

20.0 °C

400 - 950 MPa

Tensile strength, transverse

20.0 °C

420 - 620 MPa

Yield strength Rp0.2

20.0 °C

200 - 320 MPa

100.0 °C

190 - 230 MPa

150.0 °C

180 - 220 MPa

200.0 °C

170 - 205 MPa

250.0 °C

160 - 190 MPa

300.0 °C

155 - 180 MPa

350.0 °C

165 MPa

Yield strength Rp0.2, transverse

20.0 °C

200 - 240 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

20.0 °C

9.9E-6 1/K

100.0 °C

1E-5 - 1.03E-5 1/K

200.0 °C

1E-5 - 1.08E-5 1/K

300.0 °C

1.05E-5 - 1.12E-5 1/K

400.0 °C

1.05E-5 - 1.16E-5 1/K

500.0 °C

1.1E-5 - 1.19E-5 1/K

600.0 °C

1.21E-5 1/K

700.0 °C

1.24E-5 1/K

800.0 °C

1.29E-5 1/K

Max service temperature, long

0 - 200 °C

Melting point

1425 - 1530 °C

Typical for Ferritic Stainless Steel

Specific heat capacity

20.0 °C

450 - 460 J/(kg·K)

100.0 °C

482 J/(kg·K)

200.0 °C

506 J/(kg·K)

300.0 °C

525 J/(kg·K)

400.0 °C

547 J/(kg·K)

500.0 °C

576 J/(kg·K)

600.0 °C

616 J/(kg·K)

Thermal conductivity

20.0 °C

16 - 25 W/(m·K)

100.0 °C

17.2 W/(m·K)

200.0 °C

18.6 W/(m·K)

300.0 °C

20 W/(m·K)

400.0 °C

21.2 W/(m·K)

500.0 °C

22.3 W/(m·K)

600.0 °C

23.3 W/(m·K)

700.0 °C

24.1 W/(m·K)

800.0 °C

25.5 W/(m·K)

900.0 °C

26.9 W/(m·K)

1000.0 °C

28.3 W/(m·K)

Thermal diffusivity

20.0 °C

4.7 mm²/s

100.0 °C

4.5 mm²/s

200.0 °C

4.5 mm²/s

300.0 °C

4.6 mm²/s

400.0 °C

4.4 mm²/s

500.0 °C

4.1 mm²/s

600.0 °C

3.6 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

6E-7 - 9.06E-7 Ω·m

100.0 °C

9.42E-7 Ω·m

200.0 °C

9.87E-7 Ω·m

300.0 °C

1.03E-6 Ω·m

400.0 °C

1.08E-6 Ω·m

500.0 °C

1.12E-6 Ω·m

600.0 °C

1.18E-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

Carbon

0.05 %

Chromium

16 - 18 %

Manganese

1 %

Niobium

1 %

Phosphorus

0.04 %

Silicon

1 %

Sulfur

0.015 %


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