H925 Hardened CB7Cu-2 Cast Stainless Steel
H925 CB7Cu-2 is ACI-ASTM CB7Cu-2 steel in the hardened (H) condition. It has the highest strength compared to the other variants of ACI-ASTM CB7Cu-2 steel. The graph bars on the material properties cards below compare H925 CB7Cu-2 to: cast precipitation-hardening 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
420
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
5.7 %
Fatigue Strength
570 MPa 83 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
75 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1350 MPa 200 x 103 psi
Tensile Strength: Yield (Proof)
1180 MPa 170 x 103 psi
Thermal Properties
Latent Heat of Fusion
280 J/g
Melting Completion (Liquidus)
1430 °C 2600 °F
Melting Onset (Solidus)
1380 °C 2520 °F
Specific Heat Capacity
480 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
17 W/m-K 9.8 BTU/h-ft-°F
Thermal Expansion
11 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
13 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
38 MJ/kg 16 x 103 BTU/lb
Embodied Water
130 L/kg 15 gal/lb
Common Calculations
PREN (Pitting Resistance)
15
Resilience: Ultimate (Unit Rupture Work)
74 MJ/m3
Resilience: Unit (Modulus of Resilience)
3600 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
48 points
Strength to Weight: Bending
35 points
Thermal Diffusivity
4.6 mm2/s
Thermal Shock Resistance
45 points
Alloy Composition
| Fe | 73.6 to 79 | |
| Cr | 14 to 15.5 | |
| Ni | 4.5 to 5.5 | |
| Cu | 2.5 to 3.2 | |
| Si | 0 to 1.0 | |
| Mn | 0 to 0.7 | |
| Nb | 0 to 0.35 | |
| C | 0 to 0.070 | |
| N | 0 to 0.050 | |
| P | 0 to 0.035 | |
| S | 0 to 0.030 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM A747: Standard Specification for Steel Castings, Stainless, Precipitation Hardening
Corrosion of Stainless Steels, A. John Sedriks, 1996
ASM Specialty Handbook: Stainless Steels, J. R. Davis (editor), 1994
Advances in Stainless Steels, Baldev Raj et al. (editors), 2010