A 681 D2 Tool Die Steels to A 681 (2008)

A 681 D2 - Specification & Application

  • A 681 (2008) - Tool Steels Alloy

Cold working die steel

Chemical composition(wt.%) of A 681 D2 grade: to A 681 (2008)

Elements Min.(≥) Max.(≤) Similar Remarks
C 1.40 1.6
Si - 0.6
Mn - 0.6
P - 0.03
S - 0.03
Cr 11.50 13.00
Ni - 0.25
Cu - 0.30
V - 1.00
Mo - 0.70

A 681 D2 - Detail

D2 steel is high wear-resisting micro deformation of cold work die steel, belong to the wind type hard tool steel.The mass fraction of the carbon steel is as high as 1.5%, mass fraction of chromium is as high as 11.5%, the hardness after heat treatment can reach 60 HRC, but relatively ductility, toughness, rust resistant ability is weak, the steel surface is also difficult to make mirror polishing processing.With cold stamping products towards high precision, high efficiency, the development of more varieties, for die steel has good abrasion resistance and toughness.Compared with Cr12MoV steel, on chemical composition of the steel increased Mo, V, changed the steel casting organization, improved the morphology of austenite dish, strong toughness and abrasion resistance is better than that of Cr12MoV steel, improve the service life of the mold.Due to the yield point and the plastic deformation resistance of the steel is Cr12MoV steel is high, so the forging properties and hot molding Cr12MoV steels are slightly older.

hardness
Annealing acuities were 255 hb, indentation diameter of 3.8 mm or more;
Quenching acuity 59 HRC
Heat treatment specification
Quenching, 820 + 15 ℃ preheat, 820 + 6 ℃ (salt bath) or 1010 + 6 ℃ heating furnace atmosphere,
Cold insulation 10 ~ 20 min, empty, 200 + 6 ℃ tempering.

Mechanical properties of grade A 681 D2 A 681 (2008)

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)
366 (≥) 843 (≥) 21 12 13 Solution and Aging, Annealing, Ausaging, Q+T,etc 434

Physical properties of grade A 681 D2 A 681 (2008)

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
454 (≥) 211 (≥) 42 42 21 Solution and Aging, Annealing, Ausaging, Q+T,etc 334
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0) N/mm2
Creep rupture strength
(10000h)
(Rp1,0) N/mm2
991 644 298
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