A 681 D2 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 681 D2

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ASTM A 681 D2

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This page is mainly introduced the A 681 D2 chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of A 681 D2,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
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.

Cross Reference Table(Equivalent Materials):

Material Standard Country
D2 ASTM USA

Chemical composition(mass fraction)(wt.%)

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

Mechanical Properties

Tensile strength 949~376 σb/MPa
Yield Strength 737 σ 0.2 ≥/MPa
Elongation 28 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 675~923 -
HRC 30 -

Physical Properties

Thermal expansion 98-33 e-6/K
Thermal conductivity 13-14 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 7138-3011 째C
Density 6486-3774 kg/m3
Resistivity 0.50-0.60 Ohm.mm2/m
     

Heat Treatment Regime

Annealing

Quenching

Tempering

Normalizing

Q & T

Size Availability

Steel Grade Specification Processing range(mm)
A 681 D2 Tool Die Steels Round Bar and Hollow Bar Φ1 to Φ2000
Square and Flat Steel Φ10 to Φ100
Plate and Sheet 0.08-800(Thickness)*10-1500(Width)*Length
Tube or Pipe OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
Coil and Strip Steel THK:0.1mm Width:1500mm
Forged Ring/Cylindrical/Disk

Technical specification/standard for download

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