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DIN 17155 Grade 15Mo3 Normalized Steel – High‑Temperature Performance up to 530 °C

High temperature steel for the pressure vessel and steam boiler construction up to 530 °C continuous operation. Application: in the pressure vessel and steam vessel construction for vaporiser tubes, tubes, collector tubes, heat exchanger, pre welded collars, flanges

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.85 - 7.86 g/cm³

50.0 °C

7.84 g/cm³

100.0 °C

7.82 g/cm³

150.0 °C

7.81 g/cm³

200.0 °C

7.79 g/cm³

250.0 °C

7.77 g/cm³

300.0 °C

7.76 g/cm³

350.0 °C

7.74 g/cm³

400.0 °C

7.72 g/cm³

450.0 °C

7.7 g/cm³

500.0 °C

7.68 g/cm³

550.0 °C

7.66 g/cm³

600.0 °C

7.64 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

-100.0 °C

217 GPa

20.0 °C

212 - 212.48 GPa

50.0 °C

211.6 GPa

100.0 °C

207 - 209.25 GPa

150.0 °C

206.11 GPa

200.0 °C

199 - 202.48 GPa

250.0 °C

198.36 GPa

300.0 °C

192 - 194.14 GPa

350.0 °C

189.82 GPa

400.0 °C

184 - 185.51 GPa

450.0 °C

180.99 GPa

500.0 °C

175 - 176.48 GPa

550.0 °C

171.97 GPa

600.0 °C

164 - 166.97 GPa

Elongation

20.0 °C

19 - 23 %

Elongation, transverse

20.0 °C

20 %

Hardness, Brinell

20.0 °C

130 - 170 [-]

Poisson's ratio

20.0 °C

0.29 [-]

50.0 °C

0.29 [-]

100.0 °C

0.29 [-]

150.0 °C

0.29 [-]

200.0 °C

0.29 [-]

250.0 °C

0.29 [-]

300.0 °C

0.29 [-]

350.0 °C

0.29 [-]

400.0 °C

0.3 [-]

450.0 °C

0.3 [-]

500.0 °C

0.3 [-]

550.0 °C

0.3 [-]

600.0 °C

0.3 [-]

Shear modulus

20.0 °C

82.6 GPa

50.0 °C

82.21 GPa

100.0 °C

81.23 GPa

150.0 °C

79.95 GPa

200.0 °C

78.48 GPa

250.0 °C

76.81 GPa

300.0 °C

75.05 GPa

350.0 °C

73.38 GPa

400.0 °C

71.61 GPa

450.0 °C

69.75 GPa

500.0 °C

67.98 GPa

550.0 °C

66.22 GPa

600.0 °C

64.35 GPa

Tensile strength

20.0 °C

420 - 600 MPa

Yield strength Rp0.2

20.0 °C

220 - 295 MPa

100.0 °C

240 - 264 MPa

150.0 °C

220 - 245 MPa

200.0 °C

190 - 240 MPa

250.0 °C

175 - 220 MPa

300.0 °C

150 - 205 MPa

350.0 °C

145 - 190 MPa

400.0 °C

140 - 180 MPa

450.0 °C

135 - 170 MPa

500.0 °C

130 - 165 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

20.0 °C

1.15E-5 1/K

100.0 °C

1.21E-5 - 1.22E-5 1/K

200.0 °C

1.27E-5 - 1.29E-5 1/K

300.0 °C

1.32E-5 - 1.34E-5 1/K

400.0 °C

1.36E-5 - 1.4E-5 1/K

500.0 °C

1.4E-5 - 1.43E-5 1/K

600.0 °C

1.44E-5 - 1.46E-5 1/K

Max service temperature, long

0 - 530 °C

Melting point

1382 - 1529 °C

Typical for Molybdenum Steel

Specific heat capacity

-100.0 °C

423 J/(kg·K)

20.0 °C

461 J/(kg·K)

100.0 °C

479 - 500 J/(kg·K)

200.0 °C

499 - 540 J/(kg·K)

300.0 °C

517 - 530 J/(kg·K)

400.0 °C

536 - 620 J/(kg·K)

500.0 °C

558 - 690 J/(kg·K)

600.0 °C

587 - 780 J/(kg·K)

Thermal conductivity

20.0 °C

52.1 W/(m·K)

100.0 °C

51 - 51.2 W/(m·K)

200.0 °C

48.7 - 49 W/(m·K)

300.0 °C

45 - 45.5 W/(m·K)

400.0 °C

42 - 42.3 W/(m·K)

500.0 °C

39 - 39.1 W/(m·K)

600.0 °C

36 W/(m·K)

Thermal diffusivity

20.0 °C

14.4 mm²/s

100.0 °C

13.2 mm²/s

200.0 °C

11.7 mm²/s

300.0 °C

10.3 mm²/s

400.0 °C

9 mm²/s

500.0 °C

7.5 mm²/s

600.0 °C

6 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

2E-7 - 2.16E-7 Ω·m

50.0 °C

2.37E-7 Ω·m

100.0 °C

2.5E-7 - 2.68E-7 Ω·m

150.0 °C

3.02E-7 Ω·m

200.0 °C

3.24E-7 - 3.39E-7 Ω·m

250.0 °C

3.8E-7 Ω·m

300.0 °C

4.1E-7 - 4.25E-7 Ω·m

350.0 °C

4.74E-7 Ω·m

400.0 °C

5.14E-7 - 5.27E-7 Ω·m

450.0 °C

5.83E-7 Ω·m

500.0 °C

6.33E-7 - 6.42E-7 Ω·m

550.0 °C

7.08E-7 Ω·m

600.0 °C

7.69E-7 - 7.8E-7 Ω·m

Chemical properties

PropertyValue

Carbon

0.12 - 0.22 %

Chromium

0.25 %

Copper

0.3 %

Manganese

0.4 - 0.9 %

Molybdenum

0.25 - 0.35 %

Phosphorus

0.04 %

Silicon

0.1 - 0.4 %

Sulfur

0.03 %


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