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Chromium Alloy 33 (R20033)

Chromium 33 is a chromium alloy. Cited properties are appropriate for the annealed condition. Chromium Alloy 33 is the ASTM designation for this material. R20033 is the UNS number.

This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

It has a very high heat capacity among alloys in the same category. In addition, it has a very high tensile strength and a fairly low density.

The graph bars on the material properties cards below compare chromium 33 to: chromium alloys (top), all alloys in the same category (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

45 %

Poisson's Ratio

0.27

Shear Modulus

81 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

850 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

430 MPa 62 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

36 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

6.0 kg CO2/kg material

Embodied Energy

84 MJ/kg 36 x 103 BTU/lb

Embodied Water

250 L/kg 30 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

320 MJ/m3

Resilience: Unit (Modulus of Resilience)

450 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

30 points

Strength to Weight: Bending

25 points

Thermal Shock Resistance

21 points

Alloy Composition

Chromium (Cr)Cr 31 to 35
Iron (Fe)Fe 25.7 to 37.9
Nickel (Ni)Ni 30 to 33
Molybdenum (Mo)Mo 0.5 to 2.0
Manganese (Mn)Mn 0 to 2.0
Copper (Cu)Cu 0.3 to 1.2
Nitrogen (N)N 0.35 to 0.6
Silicon (Si)Si 0 to 0.5
Phosphorus (P)P 0 to 0.020
Carbon (C)C 0 to 0.015
Sulfur (S)S 0 to 0.010

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

Followup Questions

Further Reading

ASTM B649: Standard Specification for Ni-Fe-Cr-Mo-Cu Low-Carbon Alloy (UNS N08904), Ni-Fe-Cr-Mo-Cu-N Low-Carbon Alloys (UNS N08925, UNS N08031, and UNS N08926), and Cr-Ni-Fe-N Low-Carbon Alloy (UNS R20033) Bar and Wire

ASTM B462: Standard Specification for Forged or Rolled UNS N06030, UNS N06022, UNS N06035, UNS N06200, UNS N06059, UNS N06686, UNS N08020, UNS N08024, UNS N08026, UNS N08367, UNS N10276, UNS N10665, UNS N10675, UNS N10629, UNS N08031, UNS N06045, UNS N06025, and UNS R20033 Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service

ASTM B619: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe

ASTM B626: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Tube

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

ASTM B564: Standard Specification for Nickel Alloy Forgings