# Annealed (+A) 1.7241 Steel

EN 1.7241 +A steel is EN 1.7241 steel in the annealed condition. It has the second lowest strength compared to the other variants of EN 1.7241 steel. The graph bars on the material properties cards below compare EN 1.7241 +A 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

220

Elastic (Young's, Tensile) Modulus

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

Elongation at Break

20 *%*

Fatigue Strength

310 *MPa* 45 *x 10 ^{3} psi*

Poisson's Ratio

0.29

Shear Modulus

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

Shear Strength

450 *MPa* 66 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

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

Tensile Strength: Yield (Proof)

440 *MPa* 64 *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* 2650 *°F*

Melting Onset (Solidus)

1420 *°C* 2580 *°F*

Specific Heat Capacity

470 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Conductivity

44 *W/m-K* 25 *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

2.5 *% 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* 8.7 *x 10 ^{3} BTU/lb*

Embodied Water

51 *L/kg* 6.0 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

530 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

24 *points*

Strength to Weight: Axial

26 *points*

Strength to Weight: Bending

23 *points*

Thermal Diffusivity

12 *mm ^{2}/s*

Thermal Shock Resistance

21 *points*

## Alloy Composition

Fe | 96.6 to 97.8 | |

Mn | 0.7 to 1.0 | |

Cr | 0.7 to 1.0 | |

C | 0.56 to 0.64 | |

Mo | 0.25 to 0.35 | |

Si | 0 to 0.4 | |

P | 0 to 0.025 | |

S | 0 to 0.025 |

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

## Followup Questions

## Further Reading

EN 10089: Hot rolled steels for quenched and tempered springs - Technical delivery conditions

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