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Carbon		2 - 2.35
Chromium		11 - 13.5
Iron		Balance
Manganese		0.6 max
Phosphorus		0.03 max
Silicon		0.6 max
Sulphur		0.03 max
Tungsten		1 max
Vanadium		1 max

Principal Design Features		D3 is an oil hardening, high Carbon/ Chromium type tool steel with very high wear resistance. It hardens with a very slight change in size. The alloy possesses very high compressive strength and is deep hardening.

Applications		D3 is used in tooling applications requiring a high degree of accuracy in hardening, such as draw dies, forming rolls, powder metal tooling and blanking and forming dies.

Machinability		The machinability rating of D3 is roughly 25% that of free machining carbon steel 1018.. Due to its abrasion resistant nature, machining in the hardened condition should be limited to finish grinding.

Heat Treatment		Maximum properties are achieved through the process of hardening and tempering. See the processes below. For maximum accuracy, parts should be stress relieved after roughing operations. Stress relieve at 1200F for one hour and cool slowly.

Annealing		Annealing should be performed in a controlled atmosphere furnace. Heat thoroughly to 1600 F and cool slowly, at a rate of not more than 20 F per hour, until furnace is black. Material may then be removed and air cooled.

Tempering		After cooling to room temperature, parts should be tempered immediately. Place parts in the tempering furnace and raise slowly to desired tempering temperature. Temper for 1 hour per inch of thickness.

Hardening		Do not overheat this material, it is very sensitive to overheating and will not achieve maximum hardness if heated improperly. Harden by placing the work directly into a furnace preheated to 1750F and soak for 20-25 minutes, plus 5 minutes per inch of thickness, and quench in oil.

Physical Data : [top]

Density (lb / cu. in.)	0.284
Specific Gravity	7.86
Modulus of Elasticity Tension	30

MSO currently has no data available for this grade.