AISI D2 | 1.2379 | SKD11 2018-11-06T12:08:14+00:00

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.AISI D2 | 1.2379 | SKD11 tool steel

1.Supply Form & Size & Tolerance

Supply FormSize(mm)ProcessTolerance



Round
Φ6-Φ100Cold DrawnBright/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

2.Chemical Composition

StandardGradeCSiMnPSCrVMo
ASTM A681D21.4-1.60.1-0.60.1-0.60.030.0311.0-13.00.5-1.10.7-1.2
DIN ISO 49571.23791.45-1.60.15-0.60.2-0.60.030.0311.0-13.00.7-1.00.7-1.0
JIS G4404SKD111.4-1.60.40.60.030.0311.0-13.00.2-0.50.8-1.2

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

MetricImperial
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
HRCMpaksi
622200319
602150312
551900276
501650239

6.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.

7.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.

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.

9.Hardening

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.

10.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 ,°C150200250300350400
Hardness,HRC62-6161-6060-5957-5656-5556-55

11.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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