SAE-AISI S1 (T41901) Shock-Resisting Steel

SAE-AISI S1 steel is a tool steel. S1 is the designation in both the SAE and AISI systems for this material. T41901 is the UNS number.

The properties of SAE-AISI S1 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 S1 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 S1 Tool Steel Hardened S1 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 10⁶ psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

690 to 1840 MPa 100 to 270 x 10³ psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Melting Completion (Liquidus)

1500 °C 2730 °F

Melting Onset (Solidus)

1450 °C 2650 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

41 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

8.0 % relative

Density

8.0 g/cm³ 500 lb/ft³

Embodied Carbon

2.6 kg CO₂/kg material

Embodied Energy

37 MJ/kg 16 x 10³ BTU/lb

Embodied Water

56 L/kg 6.7 gal/lb

Common Calculations

PREN (Pitting Resistance)

5.9

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 to 64 points

Strength to Weight: Bending

22 to 42 points

Thermal Diffusivity

11 mm²/s

Thermal Shock Resistance

21 to 56 points

Alloy Composition

Iron (Fe)Fe		91.6 to 96.7
Tungsten (W)W		1.5 to 3.0
Chromium (Cr)Cr		1.0 to 1.8
Silicon (Si)Si		0.15 to 1.2
Carbon (C)C		0.4 to 0.55
Manganese (Mn)Mn		0.1 to 0.4
Molybdenum (Mo)Mo		0 to 0.5
Vanadium (V)V		0.15 to 0.3
Nickel (Ni)Ni		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