HCHCR-D2 Steel

HCHCR-D2 steel is Cold Work Steel with High Carbon High Chromium contents. The Quality with high
wear resistant and toughness properties due to Vanadium addition of 0.90% . Normally it supply condition
is an Annealed and will offer hardness to reach 57-59 HRC. It can be machinable in the annealed
condition. D2 is the superior steels than D3 due to high alloys properties.

 

Physical Properties

The physical properties can vary slightly depending on the specific composition and heat treatment of the D2/ DIN 2379/ AISI D2 steel. Its always recommended to refer to the manufacturer’s specifications for precise information.

 

Coefficient of thermal expansionat °C	20-100	20-200	20-300	20-400
10-6 m/(m*K)	10.6	11.5	11.8	12.3

 

Thermal Conductivity at °C	20	350	700
W/(m*K)	16.7	20.5	24.2

 

Heat Treatment & Processes:

Heat Treatment:

The heat treatment Process includes parameters like temperatures, the rate of heating, cooling, soaking time ,the type of furnace, quenching medium, and workpiece transfer facilities.

 

Hardening:

Allow the D2/ DIN 2379/ AISI D2 tool steel to soak at 750-800°C after preheating it. The tools are then heated to 1000-1040°C for air cooling and 980°C for oil quenching. Soak for thirty minutes per 25mm of the ruling part at the temperature, then cool or quench as needed. When heating for hardening, it is critical not to surpass 1040°C.

 

Tempering:

Tempering of D2/ DIN 2379/ AISI D2 tool steel should be done with the least possible delay after hardening, preferably when the tools still hand warm. Double tempering is recommended. Heat slowly and uniformly. When the D2/ DIN 2379/ AISI D2 has reached the desired temperature, soak for at least one hour per 25mm of section. The second tempering should be a repetition of the first.

 

Stress Relieving:

The Stress relief must be done after rough machining. To stress relief, heat the component to approx. 600-650°C in the case of D2/ DIN 2379/ AISI D2 steel. Then it should be Soaked well and cooled in the furnace or in the air.

 

Normalizing:

D2/ DIN 2379/ AISI D2 steel normalizing process should be avoided because there are chances of distortion due to stress with faster cooling .

 

Annealing:

It is necessary to heat gently and consistently to 900°C for the annealing of D2/ DIN 2379/ AISI D2 steel. Then it must soak for three to four hours before cooling in the furnace till room temperature. Reheat to 800–1040°C, then soak for another three–four hours. Allow the furnace to drop to room temperature.

 

Welding:

The metal should always be welded in the annealed or hardened condition always. Hence, it should be used with lowest possible weld current, Peen each weld after completion, ensure parts are clean. Avoid excess joint restraints.

 

Soft annealing °C	Cooling	Hardness HB
840 – 870	Furnace	max. 250

 

Stress-relief annealing °C	Cooling
approx. 660-710	Furnace

 

Hardening °C	Quenching	Hardness after quenching HRC
1000-1050	Air, oil or saltbath, 500-550 °C	63

 

Tempering °C after quenching	100	200	300	400	500	525	550	600
HRC	64	61.5	58.5	58.5	59	60	57	50

HCHCR D2 tool steel applicable for cold stamping or forming dies, cold forming rolls, Chipper knives, Punches, slitters, shear blades, tools, tyre shredders, trimming, cutting Threading Dies , stamping tools Etc.

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