# Quenched and Tempered (+QT2) 1.1165 Cast Steel

EN 1.1165 +QT2 steel is EN 1.1165 cast steel in the quenched and tempered condition. It has the highest strength and lowest ductility compared to the other variants of EN 1.1165 cast steel. The graph bars on the material properties cards below compare EN 1.1165 +QT2 steel to: cast carbon 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

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

11 *%*

Fatigue Strength

380 *MPa* 55 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

35 *J* 26 *ft-lb*

Poisson's Ratio

0.29

Shear Modulus

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

Tensile Strength: Ultimate (UTS)

780 *MPa* 110 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

620 *MPa* 89 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

400 *°C* 750 *°F*

Melting Completion (Liquidus)

1460 *°C* 2650 *°F*

Melting Onset (Solidus)

1420 *°C* 2580 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

51 *W/m-K* 30 *BTU/h-ft-°F*

Thermal Expansion

12 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.8 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.9 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

1.9 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

19 *MJ/kg* 8.1 *x 10 ^{3} BTU/lb*

Embodied Water

47 *L/kg* 5.7 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

81 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

1010 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

28 *points*

Strength to Weight: Bending

24 *points*

Thermal Diffusivity

14 *mm ^{2}/s*

Thermal Shock Resistance

25 *points*

## Alloy Composition

Fe | 97.2 to 98.6 | |

Mn | 1.2 to 1.8 | |

Si | 0 to 0.6 | |

C | 0.25 to 0.32 | |

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

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

Carbon Steel Handbook, D. Gandy, 2007

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015