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UNS N08135 Iron-Nickel-Chromium Alloy

N08135 stainless steel is a superaustenitic (highly alloyed) stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the solution annealed (AT) condition.

It has a fairly high ductility among wrought superaustenitic stainless steels. In addition, it has a very high base cost and a fairly high embodied energy.

The graph bars on the material properties cards below compare N08135 stainless steel to: wrought superaustenitic stainless steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

200 GPa 30 x 106 psi

Elongation at Break

46 %

Fatigue Strength

220 MPa 32 x 103 psi

Poisson's Ratio

0.28

Shear Modulus

80 GPa 12 x 106 psi

Shear Strength

400 MPa 58 x 103 psi

Tensile Strength: Ultimate (UTS)

570 MPa 83 x 103 psi

Tensile Strength: Yield (Proof)

240 MPa 35 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

430 °C 810 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1440 °C 2630 °F

Melting Onset (Solidus)

1390 °C 2540 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

16 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

39 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

6.8 kg CO2/kg material

Embodied Energy

94 MJ/kg 41 x 103 BTU/lb

Embodied Water

220 L/kg 27 gal/lb

Common Calculations

PREN (Pitting Resistance)

38

Resilience: Ultimate (Unit Rupture Work)

210 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

13 points

Alloy Composition

Among wrought stainless steels, the composition of N08135 stainless steel is notable for including tungsten (W) and containing a comparatively high amount of nickel (Ni). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Nickel is primarily used to achieve a specific microstructure. In addition, it has a beneficial effect on mechanical properties and certain types of corrosion.

Iron (Fe) 30.2 to 42.3
Nickel (Ni) 33 to 38
Chromium (Cr) 20.5 to 23.5
Molybdenum (Mo) 4.0 to 5.0
Manganese (Mn) 0 to 1.0
Tungsten (W) 0.2 to 0.8
Silicon (Si) 0 to 0.75
Copper (Cu) 0 to 0.7
Carbon (C) 0 to 0.030
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B622: Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube

Nickel Alloys, Ulrich Heubner (editor), 1998

Corrosion of Austenitic Stainless Steels: Mechanism, Mitigation and Monitoring, H. S. Khatak and B. Raj (editors), 2002

Austenitic Stainless Steels: Microstructure and Mechanical Properties, P. Marshall, 1984

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010