ASTM A732 Grade 3Q Cast Steel
ASTM A732 grade 3Q is a type of ASTM A732 cast steel. Cited properties are appropriate for the quenched and tempered condition. The graph bars on the material properties cards below compare ASTM A732 grade 3Q to: cast alloy 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
230
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
10 %
Fatigue Strength
430 MPa 63 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
72 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
770 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
710 MPa 100 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
400 °C 760 °F
Melting Completion (Liquidus)
1450 °C 2650 °F
Melting Onset (Solidus)
1410 °C 2570 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
43 W/m-K 25 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.5 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.3 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.5 kg CO2/kg material
Embodied Energy
19 MJ/kg 8.4 x 103 BTU/lb
Embodied Water
48 L/kg 5.7 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
75 MJ/m3
Resilience: Unit (Modulus of Resilience)
1340 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
27 points
Strength to Weight: Bending
24 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
23 points
Alloy Composition
| Fe | 96 to 98.8 | |
| Mn | 0.7 to 1.0 | |
| Si | 0.2 to 1.0 | |
| C | 0.35 to 0.45 | |
| Ni | 0 to 0.5 | |
| Cu | 0 to 0.5 | |
| Cr | 0 to 0.35 | |
| W | 0 to 0.1 | |
| S | 0 to 0.045 | |
| P | 0 to 0.040 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM A732: Standard Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015