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AISI 310Cb (S31040) Stainless Steel

AISI 310Cb stainless steel is an austenitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 310Cb is the AISI designation for this material. S31040 is the UNS number.

It has a fairly high base cost among wrought austenitic stainless steels. In addition, it has a fairly high embodied energy and a moderately low tensile strength.

The graph bars on the material properties cards below compare AISI 310Cb stainless steel to: wrought austenitic 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

Brinell Hardness

190

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

39 %

Fatigue Strength

200 MPa 29 x 103 psi

Poisson's Ratio

0.28

Reduction in Area

46 %

Rockwell B Hardness

84

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

390 MPa 57 x 103 psi

Tensile Strength: Ultimate (UTS)

580 MPa 84 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 34 x 103 psi

Thermal Properties

Latent Heat of Fusion

310 J/g

Maximum Temperature: Corrosion

520 °C 970 °F

Maximum Temperature: Mechanical

1100 °C 2010 °F

Melting Completion (Liquidus)

1410 °C 2570 °F

Melting Onset (Solidus)

1360 °C 2480 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

15 W/m-K 8.5 BTU/h-ft-°F

Thermal Expansion

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

4.8 kg CO2/kg material

Embodied Energy

69 MJ/kg 30 x 103 BTU/lb

Embodied Water

190 L/kg 23 gal/lb

Common Calculations

PREN (Pitting Resistance)

25

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

3.9 m2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among wrought stainless steels, the composition of AISI 310Cb stainless steel is notable for containing a comparatively high amount of chromium (Cr) and including niobium (Nb). Chromium is the defining alloying element of stainless steel. Higher chromium content imparts additional corrosion resistance. Niobium is primarily used to improve yield strength, particularly at elevated temperatures.

Iron (Fe) 47.2 to 57
Chromium (Cr) 24 to 26
Nickel (Ni) 19 to 22
Manganese (Mn) 0 to 2.0
Silicon (Si) 0 to 1.5
Niobium (Nb) 0 to 1.1
Carbon (C) 0 to 0.080
Phosphorus (P) 0 to 0.045
Sulfur (S) 0 to 0.030

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

Followup Questions

Similar Alloys

Further Reading

Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003

ASTM A479: Standard Specification for Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels

ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012

ASTM A959: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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

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

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