SKD-11 Tool Die Steels to G 4404 (2006)

SKD-11 - Specification & Application

  • G 4404 (2006) - Alloy tool steels

Mainly used for cold working mold: gauge, die for thread rolling, cutting tool for metal, forming roll, die for press.

Chemical composition(wt.%) of SKD-11 grade: to G 4404 (2006)

Elements Min.(≥) Max.(≤) Similar Remarks
C 1.4 1.6
Si - 0.4
Mn - 0.6
P - 0.03
S - 0.03
Cr 11 13
Mo 0.8 1.2
V 0.2 0.5

SKD-11 - Detail

The steel is a widely used international air cooling hardening cold work die steel.Approved by electric furnace smelting and the electroslag solubility, high purity, better toughness, uniform organization, has good high temperature strength, toughness and resistance to high temperature fatigue performance, can withstand the temperature shock.
High hardness, high wear resistant uniform eutectic carbides, good toughness, not easy craze, > 62 HRC hardness after quenching.At 525 ℃ nitriding processing time for 20 h/h/h, 60 ammoniation layer depth of 0.25 mm / 0. 30 mm / 0. 35 mm, the surface hardness is 1250 hv,At 570 ℃ nitriding processing time is 2 h, nitriding depth 10 ~ 20 microns, the surface hardness is 950 hv.

Mechanical properties of grade SKD-11 G 4404 (2006)

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
717 (≥) 357 (≥) 32 21 44 Solution and Aging, Annealing, Ausaging, Q+T,etc 121

Physical properties of grade SKD-11 G 4404 (2006)

Property Density
kg/dm3
Temperature T
°C/F
Specific heat
J / kgK
Thermal conductivity
W/mK
Electric resistance
µΩ·cm
Modulus of elasticity
kN/mm2
Expansion rate
663 (≥) 482 (≥) 12 41 12 Solution and Aging, Annealing, Ausaging, Q+T,etc 412
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
155 157 463
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