# Quenched and Tempered (+QT) 1.7703 Steel

EN 1.7703 +QT steel is EN 1.7703 steel in the quenched and tempered condition. The graph bars on the material properties cards below compare EN 1.7703 +QT steel to: EN wrought 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

200

Elastic (Young's, Tensile) Modulus

190 *GPa* 28 *x 10 ^{6} psi*

Elongation at Break

20 *%*

Fatigue Strength

320 *MPa* 47 *x 10 ^{3} psi*

Impact Strength: V-Notched Charpy

46 *J* 34 *ft-lb*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

420 *MPa* 61 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

670 *MPa* 97 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

460 *MPa* 67 *x 10 ^{3} psi*

## Thermal Properties

Latent Heat of Fusion

250 *J/g*

Maximum Temperature: Mechanical

460 *°C* 860 *°F*

Melting Completion (Liquidus)

1470 *°C* 2680 *°F*

Melting Onset (Solidus)

1430 *°C* 2610 *°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

7.6 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

8.7 *% IACS*

## Otherwise Unclassified Properties

Base Metal Price

4.2 *% relative*

Density

7.9 *g/cm ^{3}* 490

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

35 *MJ/kg* 15 *x 10 ^{3} BTU/lb*

Embodied Water

61 *L/kg* 7.2 *gal/lb*

## Common Calculations

PREN (Pitting Resistance)

5.6

Resilience: Ultimate (Unit Rupture Work)

120 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

570 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

24 *points*

Strength to Weight: Bending

22 *points*

Thermal Diffusivity

11 *mm ^{2}/s*

Thermal Shock Resistance

19 *points*

## Alloy Composition

Fe | 94.6 to 96.4 | |

Cr | 2.0 to 2.5 | |

Mo | 0.9 to 1.1 | |

Mn | 0.3 to 0.6 | |

V | 0.25 to 0.35 | |

C | 0.11 to 0.15 | |

Ni | 0 to 0.25 | |

Cu | 0 to 0.2 | |

Si | 0 to 0.1 | |

Nb | 0 to 0.070 | |

Ti | 0 to 0.030 | |

P | 0 to 0.015 | |

N | 0 to 0.012 | |

S | 0 to 0.0050 |

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

## Followup Questions

## Further Reading

EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

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