SAE-AISI D7 (T30407) Chromium Cold-Work Steel

SAE-AISI D7 steel is a tool steel. D7 is the designation in both the SAE and AISI systems for this material. T30407 is the UNS number. It has the lowest density among the tool steels in the database.

The properties of SAE-AISI D7 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 D7 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 D7 Tool Steel Hardened D7 Tool Steel

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 10⁶ psi

Poisson's Ratio

0.28

Shear Modulus

73 GPa 11 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

800 to 2120 MPa 120 to 310 x 10³ psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1400 °C 2540 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

27 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

7.6 g/cm³ 470 lb/ft³

Embodied Carbon

11 kg CO₂/kg material

Embodied Energy

180 MJ/kg 78 x 10³ BTU/lb

Embodied Water

130 L/kg 15 gal/lb

Common Calculations

PREN (Pitting Resistance)

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

29 to 78 points

Strength to Weight: Bending

25 to 48 points

Thermal Diffusivity

7.4 mm²/s

Thermal Shock Resistance

27 to 72 points

Alloy Composition

Iron (Fe)Fe		76.6 to 81.9
Chromium (Cr)Cr		11.5 to 13.5
Vanadium (V)V		3.8 to 4.4
Carbon (C)C		2.2 to 2.5
Molybdenum (Mo)Mo		0.7 to 1.2
Manganese (Mn)Mn		0 to 0.6
Silicon (Si)Si		0 to 0.6
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