# Half-Hard K94200 Alloy

Half-hard K94200 is K94200 alloy in the half-hard temper. The graph bars on the material properties cards below compare half-hard K94200 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

140 *GPa* 21 *x 10 ^{6} psi*

Elongation at Break

5.0 *%*

Poisson's Ratio

0.34

Shear Modulus

54 *GPa* 7.8 *x 10 ^{6} psi*

Shear Strength

410 *MPa* 60 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

710 *MPa* 100 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

650 *MPa* 94 *x 10 ^{3} psi*

## Thermal Properties

Curie Temperature

350 *°C* 660 *°F*

Melting Onset (Solidus)

1440 *°C* 2620 *°F*

Specific Heat Capacity

500 *J/kg-K* 0.12 *BTU/lb-°F*

Thermal Conductivity

15 *W/m-K* 8.7 *BTU/h-ft-°F*

Thermal Expansion

5.0 *µm/m-K*

## Other Material Properties

Density

8.2 *g/cm ^{3}* 510

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

2.7 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

3.0 *% IACS*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

35 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

1460 *kJ/m ^{3}*

Stiffness to Weight: Axial

9.8 *points*

Stiffness to Weight: Bending

21 *points*

Strength to Weight: Axial

24 *points*

Strength to Weight: Bending

22 *points*

Thermal Diffusivity

3.7 *mm ^{2}/s*

Thermal Shock Resistance

70 *points*

## Followup Questions

## Further Reading

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005