Project Description

AISI D2 plastic mold tool steel Manufacturer and Exporter,supplied with round,square,and flat.AISI D2 is a high-carbon, high-chromium tool steel alloyed with molybdenum and vanadium as per ASTM A 681 standard.It is the most commonly used steel among the group D steels.It has high abrasive wear resistance,high compressive strength ,good through-hardening properties,high stability in hardening and good resistance to tempering-back. AISI D2 is often supplied in annealed condition.

DIN 1.2379 Tool steel

1.Supply Form & Size & Tolerance

Supply FormSize(mm)ProcessTolerance

Φ6-Φ100Cold DrawnBright/Black Best H11


Hot Rolled
Peeled/ground Best H11


Hot Forged
Rough Turned-0/+3mm

Thickness :120-800
Hot Forged
Rough Machined-0/+3mm

Remark:Tolerance can be customized as per requests

2.Chemical Composition

ASTM A681D21.4-1.60.1-0.60.1-
DIN ISO 49571.23791.45-1.60.15-0.60.2-
JIS G4404SKD111.4-

3.Physical Property

Temperature 20°C200°C400°C
Melting point1421°C
Density ,kg/m3770076507600
Modulus of elasticity,Mpa210000200000180000

Coefficient of thermal expansion
low temperature tempering per °C from 20°C12.3 x 10^–6
high temperature tempering per °C from 20°C11.2 x 10^–612 x 10^–6
Thermal conductivity,W/m °C202123
Specific heat,J/kg °C460

4. Mechanical Property

Hardness, Knoop (converted from Rockwell C hardness)769769
Hardness, Rockwell C6262
Hardness, Vickers748748
Izod impact unnotched77.0 J56.8 ft-lb
Poisson’s ratio0.27-0.300.27-0.30
Elastic modulus190-210 GPa27557-30457 ksi

5.Copressive Strength

Hardness Compressive yield strength, Rc 0.2


Heat the D2 tool steel slowly and uniformly to 700°C then more rapidly to 900-1040°C. Reheat is necessary when temperature is below 900°C.AISI D2 steel  should be cooled as slowly as possible in furnace,and annealing is strongly recommended after forged.


Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 220°C per hour to 870-900°C, and hold at temperature for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 20°C per hour to 530°C. Continue cooling to room temperature in the furnace or in air. The resultant hardness should be a maximum of 255 HBW.

8.Sress Relieving 
After rough machining,AISI D2 steel  should be heated throughly to 600-650°C, holding time 2 hours. Cool slowly to 500°C, then freely in air.


Preheating temperature: 650–750°C.
Austenitizing temperature: 990– 1050°C, but usually 1000–1040°C.

Temperature , °CSoaking time Min.Hardness before tempering
99060approx. 63 HRC
101045approx. 63 HRC
103030approx. 63 HRC

Quenching Media
• Oil (Only very simple geometries)
• Vacuum (high speed gas)
• Forced air/gas
• Martempering bath or fluidized bed at 180–500°C, then cooling in air.


Temper immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum, then air cool to ambient temperature. The typical tempering range is 180 to 210ºC.Double tempering is recommended.

Temperature ,°C150200250300350400


AISI D2 is used in a wide variety of tool making applications.Use D2 for applications requiring long runs and close tolerances. Use it for tools and dies for blanking, punching, forming, cold-extruding, and other operations requiring high compressive strength and excellent wear resistance.

Typical applications includes :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

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