H925 Hardened CB7Cu-1 Cast Stainless Steel
H925 CB7Cu-1 is ACI-ASTM CB7Cu-1 steel in the hardened (H) condition. It has the highest strength compared to the other variants of ACI-ASTM CB7Cu-1 steel. The graph bars on the material properties cards below compare H925 CB7Cu-1 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
Impact Strength: V-Notched Charpy
34 J 25 ft-lb
Poisson's Ratio
0.28
Shear Modulus
76 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)
1500 °C 2730 °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
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.3 % 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 16 gal/lb
Common Calculations
PREN (Pitting Resistance)
17
Resilience: Ultimate (Unit Rupture Work)
74 MJ/m3
Resilience: Unit (Modulus of Resilience)
3590 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 | 72.3 to 78.4 | |
| Cr | 15.5 to 17.7 | |
| Ni | 3.6 to 4.6 | |
| 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
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
Welding Metallurgy of Stainless Steels, Erich Folkhard et al., 2012
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015