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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

How are the material properties defined?How does chromium 33 compare to other alloys in the same category?

How does it compare to other metal alloys?

Chromium Alloy 33 (R20033)

Mechanical Properties

Thermal Properties

Otherwise Unclassified Properties

Common Calculations

Alloy Composition

Followup Questions

Further Reading

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