# Quenched and Tempered (+QT2) 1.7221 Cast Steel

EN 1.7221 +QT2 steel is EN 1.7221 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7221 +QT2 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

230

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

11 *%*

Fatigue Strength

390 *MPa* 56 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

20 *J* 15 *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)

630 *MPa* 91 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

420 *°C* 790 *°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

44 *W/m-K* 26 *BTU/h-ft-°F*

Thermal Expansion

13 *µm/m-K*

## Electrical Properties

Electrical Conductivity: Equal Volume

7.3 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.4 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

2.4 *% relative*

Density

7.8 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

20 *MJ/kg* 8.5 *x 10 ^{3} BTU/lb*

Embodied Water

51 *L/kg* 6.1 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

83 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

1050 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

27 *points*

Strength to Weight: Bending

24 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

23 *points*

## Alloy Composition

Fe | 96.8 to 98.3 | |

Cr | 0.8 to 1.2 | |

Mn | 0.5 to 0.8 | |

Si | 0 to 0.6 | |

C | 0.22 to 0.29 | |

Mo | 0.15 to 0.3 | |

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

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

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