# 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 10 ^{6} psi*

Elongation at Break

5.7 *%*

Fatigue Strength

570 *MPa* 83 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

34 *J* 25 *ft-lb*

Poisson's Ratio

0.28

Shear Modulus

76 *GPa* 11 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

1350 *MPa* 200 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

1180 *MPa* 170 *x 10 ^{3} 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/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

2.6 *kg CO _{2}/kg material*

Embodied Energy

38 *MJ/kg* 16 *x 10 ^{3} BTU/lb*

Embodied Water

130 *L/kg* 16 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

17

Resilience: Ultimate (Unit Rupture Work)

74 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

3590 *kJ/m ^{3}*

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 *mm ^{2}/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