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DIN 17744 NiCr22Mo9Nb Soft‑Annealed Alloy (+A) – High‑Performance, Corrosion‑Resistant for Pressure Vessels

According to VdTÜV-Werkstoffblatt 499 : 2002-09, the material NiCr22Mo9Nb with the material number 2.4856 is used for pressure vessels according to TRB 100 and, with interpreting the AD-Merkblatt editions W 2 and W 10 faithfully to their meaning, for temperatures from -196 to 450 degrees. Furthermore, the highly corrosion-resistant nickel-base alloy is used for ranges of applications in nuclear engineering as far as the rules of nuclear engineering or the object-related specifications permit the use of - 196 to 450 °C. The material is resistant to intercrystalline corrosion. With observance of the generally acknowledged rules of technology, the suitability for welding of this material is approved for submerged-arc welding with welding wires, metal arc welding with sheathed stick electrodes or gas-shielded arc welding with welding wires and welding rods. Welding fillers that have been tested for suitability are to be used, such as welding rods, wire electrodes made from SG-NiCr21Mo9Nb (2.4831) and sheathed stick electrodes E-NiCr20Mo9Nb (2.4621). A preheating ought to be dispensed with. The intermediate layer temperature is 150 °C maximum. A plasma-cutting of this material is possible. NiCr22Mo9Nb is contained in the VdTÜV-Wbl 541 : 2001-06 as coating material for seamless compound pipes (base materials 1.0405 and 1.7380). The following is valid for the material according to DIN 17744 : 2002-09 : the nickel alloy is applied in the form of strips, sheets, tubes, bars, wires and forgings for corrosion-resistant and highly heat-resistant construction components. The alloy possesses an extraordinary resistance to pitting, crevice corrosion, erosion and intercrystalline corrosion, and it also is insusceptible to chlorine-induced stress cracking corrosion. Good resistance to mineral acids, such as nitric, phosphoric, sulphuric and hydrochloric acid as well as to alkalis and organic acids. Because of the excellent properties in terms of high-temperature tensile strength and the wear properties together with good resistance to oxidation and carbonizing at the same time, the material is applicable up to 1050 °C. The as-delivered condition solution annealed ought to be chosen for application temperatures of more than 600 °C. In the temperature range 600 to 800 °C, the material has a tendency towards embrittlement. Application for maritime-technology plants, plants for the production or processing of sulphuric, phosphoric, nitric, hydrofluoric and hydrochloric acid and organic acids and alkalis as well as for flue-gas cleaning systems and plants for the processing of natural gas and oil. Processing properties: Formability: good Weldability: good (Werkstoffblatt/Wbl: material specification Merkblatt: specification sheet)

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.4 - 8.5 g/cm³

Mechanical

PropertyTemperatureValue

Elastic modulus

20.0 °C

209 GPa

100.0 °C

202 GPa

200.0 °C

195 GPa

300.0 °C

190 GPa

400.0 °C

185 GPa

500.0 °C

178 GPa

600.0 °C

170 GPa

700.0 °C

162 GPa

800.0 °C

153 GPa

900.0 °C

142 GPa

1000.0 °C

128 GPa

Elongation

20.0 °C

30 - 40 %

Elongation A100

20.0 °C

25 - 35 %

Elongation A80, transverse

20.0 °C

30 - 35 %

Elongation, transverse

20.0 °C

30 - 35 %

Hardness, Brinell

20.0 °C

240 [-]

Tensile strength

20.0 °C

700 - 1000 MPa

100.0 °C

600 - 740 MPa

200.0 °C

580 - 700 MPa

300.0 °C

560 - 685 MPa

400.0 °C

543 - 670 MPa

450.0 °C

530 - 660 MPa

Tensile strength, transverse

20.0 °C

760 - 1000 MPa

Yield strength Rp0.2

20.0 °C

330 - 415 MPa

100.0 °C

290 - 350 MPa

200.0 °C

265 - 320 MPa

300.0 °C

260 - 300 MPa

400.0 °C

260 - 280 MPa

450.0 °C

255 - 270 MPa

Yield strength Rp0.2, transverse

20.0 °C

380 - 400 MPa

Yield strength Rp1.0

20.0 °C

375 - 445 MPa

Thermal

PropertyTemperatureValue

Coefficient of thermal expansion

100.0 °C

1.28E-5 1/K

200.0 °C

1.11E-5 - 1.31E-5 1/K

300.0 °C

1.34E-5 1/K

400.0 °C

1.26E-5 - 1.37E-5 1/K

500.0 °C

1.41E-5 1/K

600.0 °C

1.38E-5 - 1.46E-5 1/K

700.0 °C

1.52E-5 1/K

800.0 °C

1.49E-5 - 1.58E-5 1/K

900.0 °C

1.64E-5 1/K

1000.0 °C

1.58E-5 - 1.7E-5 1/K

Max service temperature, long

-196 - 450 °C

Specific heat capacity

20.0 °C

410 - 415 J/(kg·K)

100.0 °C

435 J/(kg·K)

200.0 °C

460 J/(kg·K)

300.0 °C

480 J/(kg·K)

400.0 °C

505 J/(kg·K)

500.0 °C

525 J/(kg·K)

600.0 °C

550 J/(kg·K)

700.0 °C

575 J/(kg·K)

800.0 °C

600 J/(kg·K)

900.0 °C

625 J/(kg·K)

1000.0 °C

650 J/(kg·K)

Thermal conductivity

20.0 °C

9.8 - 10 W/(m·K)

100.0 °C

11.2 W/(m·K)

200.0 °C

12.8 W/(m·K)

300.0 °C

14.4 W/(m·K)

400.0 °C

16.3 W/(m·K)

500.0 °C

17 - 17.3 W/(m·K)

600.0 °C

19.3 W/(m·K)

700.0 °C

21 W/(m·K)

800.0 °C

22.6 W/(m·K)

900.0 °C

24.6 W/(m·K)

1000.0 °C

26.7 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.28E-6 - 1.29E-6 Ω·m

100.0 °C

1.3E-6 Ω·m

200.0 °C

1.32E-6 Ω·m

300.0 °C

1.33E-6 Ω·m

400.0 °C

1.35E-6 Ω·m

500.0 °C

1.36E-6 Ω·m

600.0 °C

1.36E-6 Ω·m

700.0 °C

1.36E-6 Ω·m

800.0 °C

1.36E-6 Ω·m

900.0 °C

1.35E-6 Ω·m

1000.0 °C

1.32E-6 Ω·m

Chemical properties

PropertyValue

Aluminium

0.4 %

Carbon

0.03 - 0.1 %

Chromium

20 - 23 %

Cobalt

1 %

Copper

0.5 %

Iron

5 %

Manganese

0.5 %

Molybdenum

8 - 10 %

Nickel

55.45 - 58 %

Phosphorus

0.01 - 0.02 %

Silicon

0.4 - 0.5 %

Sulfur

0.01 - 0.015 %

Titanium

0.4 %


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