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AISI D2 Tool Steel

D2-tool-steel

AISI D2 Tool Steel Manufacturer and Exporter,supplied with round,square,and flat.AISI D2 Tool Steel 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.

AISI D2 Tool Steel Supply Form & Size & Tolerance

Supply Form Size(mm) Process Tolerance

Round

Φ6-Φ100 Cold Drawn Bright/Black Best H11
Φ16-Φ350 Hot Rolled Black -0/+1mm
Peeled/ground Best H11
Φ90-Φ1000 Hot Forged Black -0/+5mm
Rough Turned -0/+3mm
Flat/Square/Block Thickness :120-800 Hot Forged Black -0/+8mm
Width:120-1500 Rough Machined -0/+3mm

Remark:Tolerance can be customized as per requests

AISI D2 Tool Steel Chemical Composition per ASTM A681 (Cold Work Tool Steel)

GRADE C Si Mn P S Cr Mo V
D2 1.40-1.60 0.10-0.60 0.10-0.60 ≤ 0.030 ≤ 0.030 11.00-13.00 0.70-1.20 0.50-1.10

 

AISI D2 Tool Steel Physical Property

Temperature 20°C 200°C 400°C
Melting point 1421°C
Density ,kg/m3 7700 7650 7600
Modulus of elasticity,Mpa 210000 200000 180000
Coefficient of thermal expansion low temperature tempering per °C from 20°C 12.3 x 10^–6
high temperature tempering per °C from 20°C 11.2 x 10^–6 12 x 10^–6
Thermal conductivity,W/m °C 20 21 23
Specific heat,J/kg °C 460

AISI D2 Tool Steel Mechanical Property

Metric Imperial
Hardness, Knoop (converted from Rockwell C hardness) 769 769
Hardness, Rockwell C 62 62
Hardness, Vickers 748 748
Izod impact unnotched 77.0 J 56.8 ft-lb
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 ksi

AISI D2 Tool Steel Copressive Strength

Hardness Compressive yield strength, Rc 0.2
HRC Mpa ksi
62 2200 319
60 2150 312
55 1900 276
50 1650 239

AISI D2 Tool Steel Forging

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.

AISI D2 Tool Steel Annealing

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.

AISI D2 Tool Steel 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.

AISI D2 Tool Steel Hardening

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

Temperature , °C Soaking time Min. Hardness before tempering
990 60 approx. 63 HRC
1010 45 approx. 63 HRC
1030 30 approx. 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.

AISI D2 Tool Steel Tempering

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 ,°C 150 200 250 300 350 400
Hardness,HRC 62-61 61-60 60-59 57-56 56-55 56-55

AISI D2 Tool Steel Application

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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