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D2 Steel
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Product: Views:280D2 Steel 
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Last updated: 2018-10-27 14:05
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1. Introduction of D2 Steel

D2 steel is an air hardening, high carbon, high chrome tool steel possessing maximum wear ability and excellent stability in heat treatment. Ideal for applications requiring wear resistance


D2 Tool Steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium-rich alloy carbides in the micro-structure. These carbides provide good resistance to wear from sliding contact with other metals and abrasive materials. Although other steels with improved toughness or improved wear resistance are available, D2 provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms. Also available as an Electro-Slag-Remelted (ESR) product. The remelting process provides improved chemical homogeneity, refinement of carbide size, and the associated improvements in mechanical and fatigue properties.


2. Supply Range of D2 Steel

Shape

Specification

Surface

Round bar

Dia max 800mm

Length: max 6m

Black, peeled, machined(turned), polished(grounded)

Flat bar

Thickness: max 800mm

Width: max 810mm Length: 6m

Black, peeled, machined, polished(ground,grinded, milled)

Note: We have our own cutting and processing equipment. Specifications can be cut and customized according to your requirements.


3. D2 steel Chemical Composition

C

Mn

Si

Cr

Mo

V

1.50

0.30

0.30

12.00

0.75

0.90


4. D2 steel Equivalent Grades

ASTM A681

C

Mn

P

S

Si

Cr

V

Mo

D2

1.4

1.6

0.1

0.6

0.03

0.03

0.1

0.6

11

13

0.5

1.1

0.7

1.2

DIN ISO 4957

C

Mn

P

S

Si

Cr

V

Mo

1.2379/X153CrMo12

1.45

1.6

0.2

0.6

0.03

0.03

0.15

1.6

11

13

0.7

1

0.7

1

JIS G4404

C

Mn

P

S

Si

Cr

V

Mo

SKD11

1.4

1.6

0.6

0.03

0.03

0.4

11

13

0.2

0.5

0.8

1.2


5. AISI Grade D2 Steel Mechanical Properties

Mechanical Properties

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


6. Thermal Properties

Properties

Conditions

T (°C)

Treatment

Thermal expansion

10.4 x 10-6/ºC

20-100


7. AISI/ASTM A681 D2 Grade Steel Forging

Heating for forging of AISI D2 tool steel should be done slowly and uniformly. Soak through at 1850°-1950°F and reheat as often as necessary, stopping work when the temperature drops below 1700°F(926°C). After D2 die steel forging, cool slowly in lime, mica, dry ashes or furnace. AISI D2 steel
should always be annealed after forging.


8. D2 Tool Steel Heat Treatment

1) Heat Treatment

ASTM D2 steels alloy should be preheated very slowly to 815℃ (1500°F) and then temperature can be increased to 1010oC (1850°F). They are then held at 1010oC (1850°F) for 20 to 45 minutes and air cooled (air quenched).

2) Annealing

Annealing of D2 tool steels material should be done at 871 to 898°C (1600 to 1650°F) followed by slow furnace cooling at 4.4°C (40°F) per hour or less.after which cooling rate may be increased. Suitable precautions must be taken to prevent excessive carburization or decarburization.

3) Stress Relieving

When desirable to relieve the strains of machining, heat D2 grade steel slowly to 1050°-1250°F, allow to equalize, and then cool in still air (Strain Relieving).

4) Preheat Prior To Hardening

Preheat slowly to 1350°-1450°F and hold at this temperature until grade steel D2 material is uniformly heated.

5) Hardening

After thorough preheating, heat to 1800°-1850°F. Hold the work piece at the hardening temperature until it is completely and uniformly heated.

6) Quenching

AISI D2 steel tool material is an air hardening steel and will develop hardness on cooling in still air. To avoid scaling and prevent decarburization of the work piece surface, controlled atmosphere or vacuum furnaces are recommended. If these furnaces are not available, pack hardening, salt baths or wrapping the piece in stainless steel foil will provide some degree of surface protection in the hardening process. Parts should be allowed to cool to 150F, or to where they can be held in the bare hand, and then temper immediately.

7) Tempering

The tempering temperature on material D2 steel may be varied according to the desired hardness. D2 steels can be tempered at 204°C (400°F) for achieving Rockwell C hardness of 61 and at 537°C (1000°F) for a Rockwell C hardness of 54.


9. Continuous Cooling Transformation (CCT) Diagram


10.Time - Temperature Transformation (TTT) Diagram

11.D2 Tool Steel Material Application

AISI grade D2 tool steels are used for long run tooling applications, where wear resistance is important, such as blanking or forming dies and thread rolling dies.

Some main applications for D2 tool steel are as below:

Blanking Dies, Forming Dies, Coining Dies, Slitting Cutters, Heading Tools, Long Punches, Forming Rolls, Edging Rolls, Master Tools, Beading Rolls, Intricate Punches, Extrusion Dies, Drawing Dies, Lamination Dies, Thread Rolling Dies, Shear Blades, Burnishing Tools, Gauges, Knurls, Wear Parts.

We usually hold D2 tool steel on sale activities, and you would have our price on regular schedule. Contact us and sign in our newsletter to have D2 tool steel materials price list and commercial quote today.


http://www.steelm2.com/

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