SKD10 Material SKD11 Steel Properties & Equivalent

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SKD10 and SKD11 Steel

Both SKD10 and SKD11 steel are high carbon and high chromium cold-work alloy tool steels with good hardenability, small heat treatment deformation, high hardness, high wear resistance and impact resistance.

Material Properties

The following table lists SKD10 and SKD11 material properties including chemical composition, physical and hardness, etc.

Chemical Composition

SKD10 and SKD11 steel chemical composition is listed in the following table.

Chemical Composition, %
Standard Steel C Si Mn P, ≤ S, ≤ Cr Mo V
JIS G4404 SKD11 1.40-1.60 ≤0.40 ≤0.60 0.030 0.030 11.00-13.00 0.80-1.20 0.20-0.50
JIS G4404 SKD10 1.45-1.60 0.10-0.60 0.20-0.60 0.030 0.030 11.00-13.00 0.70-1.00 0.70-1.00
ASTM A681 D2 1.40-1.60 0.10-0.60 0.10-0.60 0.030 0.030 11.00-13.00 0.70-1.20 0.50-1.10

Physical Properties

SKD11 material physical properties are listed in the table below including density, melting point, specific heat, elastic modulus (modulus of elasticity), and coefficient of thermal expansion (CTE).

Notes:

  • 10-6·K-1 = 10-6/K
  • 1 Ω·mm²/m = 1 μΩ·m
  • 1 g/cm3 = 1 kg/dm3 = 1000 kg/m3
  • 1 GPa = 1 kN/mm2
  • 1 MPa = 1 N/mm2
SKD11 Physical Properties
Density, g/cm3 (lb/in3) 7.80 (0.282)
Melting point, °C (°F) 1420 (2590)
Elastic modulus (Modulus of Elasticity), GPa (106 psi) 207 (30)
Thermal conductivity, W/m·K (Btu/ft · h ·°F) 26.1 (15.09)
Coefficient of thermal expansion (CTE), μm/m·K 12.0

SKD10 and SKD11 Heat Treatment

Annealing

SKD10 and SKD11 tool steel annealing temperature: 830 to 880 °C (1526-1616 °F), slow cooling, annealed hardness: ≤255 HB.

Hardening and Tempering

  • SKD10 – Quenching temperature: 1020±10 °C air cooling; Tempering temperature: 180±10 °C air cooling; quenched and tempered hardness: 720 HV.
  • SKD11 – Quenching temperature: 1030±10 °C air cooling; Tempering temperature: 180±10 °C air cooling; quenched and tempered hardness: 653 HV.

Applications

Typical applications include

  • Blanking die
  • Polishing tools
  • Casting mold
  • Drawing mould
  • Drawing die
  • Forming mold
  • Crimping die
  • Hot forging die
  • Laminated mold
  • Thread rolling die
  • Trimming mold
  • Cold extrusion die
  • Measuring tool
  • Lathe Center
  • Punch
  • Forming and bending rolls
  • Spinning tools
  • Knurled
  • Slitting knife
  • Broach
  • Wear plate
  • Mandrel
  • Knives
  • Shear blades, etc.

SKD10 & SKD11 Material Equivalent

SKD10 & SKD11 tool steel equivalent to US ASTM, European EN (Germany DIN, British BSI, French NF…), ISO, and Chinese GB standard (For reference).

SKD10 & SKD11 Equivalent Material
Japan US European ISO China Australia India Rusia Korea
Standard Steel Standard AISI (UNS) Standard Steel Number (Steel Name) Standard Steel Number (Steel Name) Standard Name Standard Grade Standard Grade Standard Grade Standard Grade
JIS G4404 SKD10, SKD11 AISI,
ASTM A681
D2 (T30402) EN ISO 4957 1.2379 (X153CrMoV12) ISO 4957 1.2379 (X153CrMoV12) GB/T 1299 Cr12Mo1V1

Note: The chemical composition of SKD10 is closer to D2, 1.2379 and Cr12Mo1V1 than SKD11 steel, SKD11 was added to this table because it is much more commonly used than SKD10 in Japan.

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