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ASTM A302 Alloy Steel

ASTM A302 alloy steel is an alloy steel formulated for primary forming into wrought products.

The properties of ASTM A302 alloy steel include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare ASTM A302 alloy steel to: wrought alloy steels in the same category (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

180 to 190

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

20 to 23 %

Fatigue Strength

250 to 280 MPa 36 to 41 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

370 to 390 MPa 53 to 57 x 103 psi

Tensile Strength: Ultimate (UTS)

590 to 620 MPa 85 to 90 x 103 psi

Tensile Strength: Yield (Proof)

350 to 390 MPa 51 to 57 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 760 to 770 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 to 51 W/m-K 22 to 30 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 to 7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 to 8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 to 3.0 % relative

Density

7.8 to 7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.5 to 1.6 kg CO2/kg material

Embodied Energy

20 to 21 MJ/kg 8.7 to 9.2 x 103 BTU/lb

Embodied Water

48 to 50 L/kg 5.8 to 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 to 410 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

21 to 22 points

Strength to Weight: Bending

20 to 21 points

Thermal Diffusivity

10 to 14 mm2/s

Thermal Shock Resistance

17 to 18 points

Followup Questions

Further Reading

ASTM A302: Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel

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

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

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015