SAE-AISI S7 (T41907) Shock-Resisting Steel

SAE-AISI S7 steel is a tool steel. S7 is the designation in both the SAE and AISI systems for this material. T41907 is the UNS number.

The properties of SAE-AISI S7 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare SAE-AISI S7 steel to: tool 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.

Annealed S7 Tool Steel Hardened S7 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

670 to 2030 MPa 97 to 290 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

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

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

5.0 % relative

Density

7.8 g/cm³ 490 lb/ft³

Embodied Carbon

2.3 kg CO₂/kg material

Embodied Energy

31 MJ/kg 13 x 10³ BTU/lb

Embodied Water

65 L/kg 7.8 gal/lb

Common Calculations

PREN (Pitting Resistance)

8.4

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 to 72 points

Strength to Weight: Bending

22 to 46 points

Thermal Diffusivity

11 mm²/s

Thermal Shock Resistance

22 to 66 points

Alloy Composition

Iron (Fe)Fe		91.6 to 94.9
Chromium (Cr)Cr		3.0 to 3.5
Molybdenum (Mo)Mo		1.3 to 1.8
Silicon (Si)Si		0.2 to 1.0
Manganese (Mn)Mn		0.2 to 0.9
Carbon (C)C		0.45 to 0.55
Vanadium (V)V		0 to 0.3
Copper (Cu)Cu		0 to 0.25
Phosphorus (P)P		0 to 0.030
Sulfur (S)S		0 to 0.030