# EN 1.3961 (GX3Ni36) Casting Alloy

EN 1.3961 alloy is an iron alloy formulated for controlled thermal expansion. Cited properties are appropriate for the quenched and tempered condition. 1.3961 is the EN numeric designation for this material. GX3Ni36 is the EN chemical designation.

The graph bars on the material properties cards below compare EN 1.3961 alloy to: low-expansion iron alloys (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

31 *%*

Poisson's Ratio

0.3

Shear Modulus

72 *GPa* 10 *x 10 ^{6} psi*

Shear Strength

300 *MPa* 43 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

450 *MPa* 65 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

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

## Thermal Properties

Latent Heat of Fusion

270 *J/g*

Melting Completion (Liquidus)

1430 *°C* 2610 *°F*

Melting Onset (Solidus)

1390 *°C* 2530 *°F*

Specific Heat Capacity

460 *J/kg-K* 0.11 *BTU/lb-°F*

Thermal Expansion

1.3 *µm/m-K*

## Otherwise Unclassified Properties

Base Metal Price

25 *% relative*

Density

8.2 *g/cm ^{3}* 510

*lb/ft*

^{3}Embodied Carbon

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

Embodied Energy

66 *MJ/kg* 28 *x 10 ^{3} BTU/lb*

Embodied Water

110 *L/kg* 14 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

250 *kJ/m ^{3}*

Stiffness to Weight: Axial

13 *points*

Stiffness to Weight: Bending

23 *points*

Strength to Weight: Axial

15 *points*

Strength to Weight: Bending

16 *points*

Thermal Shock Resistance

130 *points*

## Alloy Composition

Fe | 60.7 to 65 | |

Ni | 35 to 37 | |

Mo | 0 to 1.0 | |

Mn | 0 to 0.5 | |

Si | 0 to 0.5 | |

Cr | 0 to 0.25 | |

C | 0 to 0.050 | |

P | 0 to 0.030 | |

S | 0 to 0.020 |

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

## Followup Questions

## Similar Alloys

## Further Reading

ISO 19960: Cast steels and alloys with special physical properties

Advances in Stainless Steels, Baldev Raj et al. (editors), 2010