Welcome: Shenzhen NewAsia Steel Co.,Ltd
Language:
∷
∷
∷
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.
1.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
2.Chemical Composition
| Standard | Grade | C | Si | Mn | P | S | Cr | V | Mo |
| ASTM A681 | D2 | 1.4-1.6 | 0.1-0.6 | 0.1-0.6 | 0.03 | 0.03 | 11.0-13.0 | 0.5-1.1 | 0.7-1.2 |
| DIN ISO 4957 | 1.2379 | 1.45-1.6 | 0.15-0.6 | 0.2-0.6 | 0.03 | 0.03 | 11.0-13.0 | 0.7-1.0 | 0.7-1.0 |
| JIS G4404 | SKD11 | 1.4-1.6 | 0.4 | 0.6 | 0.03 | 0.03 | 11.0-13.0 | 0.2-0.5 | 0.8-1.2 |
3.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 | – | – | |
4. 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 |
5.Copressive Strength
| Hardness | Compressive yield strength, Rc 0.2 | |
| HRC | Mpa | ksi |
| 62 | 2200 | 319 |
| 60 | 2150 | 312 |
| 55 | 1900 | 276 |
| 50 | 1650 | 239 |
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 , °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.
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 ,°C | 150 | 200 | 250 | 300 | 350 | 400 |
| Hardness,HRC | 62-61 | 61-60 | 60-59 | 57-56 | 56-55 | 56-55 |
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
