# Quenched and Tempered (+QT1) 1.7725 Cast Steel

EN 1.7725 +QT1 steel is EN 1.7725 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7725 +QT1 steel 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

250

Elastic (Young's, Tensile) Modulus

190 *GPa* 27 *x 10 ^{6} psi*

Elongation at Break

14 *%*

Fatigue Strength

390 *MPa* 57 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

34 *J* 25 *ft-lb*

Poisson's Ratio

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

830 *MPa* 120 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

610 *MPa* 88 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

440 *°C* 820 *°F*

Melting Completion (Liquidus)

1460 *°C* 2660 *°F*

Melting Onset (Solidus)

1420 *°C* 2590 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

39 *W/m-K* 23 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.4 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.6 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

2.9 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

24 *MJ/kg* 11 *x 10 ^{3} BTU/lb*

Embodied Water

54 *L/kg* 6.5 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

2.8

Resilience: Ultimate (Unit Rupture Work)

110 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

980 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

29 *points*

Strength to Weight: Bending

25 *points*

Thermal Diffusivity

11 *mm ^{2}/s*

Thermal Shock Resistance

24 *points*

## Alloy Composition

Fe | 95.7 to 97.5 | |

Cr | 1.3 to 1.7 | |

Mn | 0.6 to 1.0 | |

Mo | 0.3 to 0.5 | |

C | 0.27 to 0.34 | |

Si | 0 to 0.6 | |

V | 0.050 to 0.15 | |

S | 0 to 0.030 | |

P | 0 to 0.025 |

All values are % weight. Ranges represent what is permitted under applicable standards.

## Followup Questions

## Further Reading

EN 10293: Steel castings - Steel castings for general engineering uses

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