D2 Tool Steel (X153CrMoV12)

D2 toolsteel is a 12% chrome steel, it has very high resistance against abrasive and adhesive wear due to a high volume of hard carbides in the steel matrix, good toughness, very good dimensional stability, high compressive strength, and has a very good base material for PVD/CVD coating as well as nitriding due to its secondary hardening properties. Similar to AISI D2. Applications: Cutting, punching, stamping tools, shear blades, thread rolling dies, cold extrusion dies, drawing and bending tools, flanging and straightening rolls, fine cutting tools, deep drawing tools, plastic moulds for abrasive polymers.
Colour Code Stocked Sizes

Rounds: Squares:Flats:
16 mm - 413 mm Dia25 mm - 250 mm AF

55 mm x 14 mm - 400 mm x 100 mm

Condition of Delivery
Soft annealed to max. 255 HB
Related Specifications
Germany DIN 1.2379
Chemical Composition
Carbon 1.55
Chromium 12.00
Molybdenum 0.80
Vanadium 0.90
Physical Properties
Thermal expansion coefficient
Thermal conductivity
Heat Treatment
Soft Annealing
Temperature 820 - 850oC
Cooling furnace
Hardness max 255 HB
Stress Relief Annealing
Temperature 600 - 650oC
Cooling furnace
Temperature 1020 - 1030oC 1040 - 1080oC
Cooling oil, pressure (N2)
air or hot bath
500 - 550oC
see tempering diagram
usually < 300°C
Hardness oil, pressure (N2)
air or hot bath
500 - 550oC
see tempering diagram
usually 500°C
Thermal Cycle Diagram
Continuous Cooling Transformation Diagram (CCT)
Tempering Diagram
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