D3

Mankrida Steels is the largest Supplier & Stockiest of HCHCR-D3 Steel in India. D3 Steel Having 12 % ledeburitic chromium tool steel with great wears resistance . Basically utilized as cutting tools for sheets up to 4 mm thickness, trimming dies, blanking dies for paper and plastics, shear cutting edges and rotational shear edges for sheet thicknesses up to 2 mm.

Steel Properties

D3 Steel having properties of High Carbon 2% and High chromium 12 % tool steel with high wear resistance. Its supply condition is normally annealed to easy machining which recommended hardness is 57-58 HRC after making the dies & tools.

Physical Properties

Coefficient of thermal expansionat °C	20-100	20-200	20-300	20-400	20-500	20-600	20-700
10-6 m/(m*K)	10.7	11.6	12.3	12.6	12.9	13.2	13.3

Thermal Conductivity at °C	20	350	700
W/(m*K)	16.6	20.5	24.3

Application

HCHCR D3 is used in cold Dies & tooling application that required the achievement of high degree of accuracy in hardening & tempering, such as dies drawing, forming cold rolls, powder metal tooling and blanking and trimming dies, blanking dies for paper and plastics, shear blades , cold die punches , Ejector pins etc.

Heat Treatment

Soft annealing °C	Cooling	Hardness HB
810 - 850	Furnace	max. 250

Stress-relief annealing °C	Cooling
approx. 670-720	Furnace

Hardening °C	Quenching	Hardness after quenching HRC
940 – 970	Oil	64.5
950-980	Air (up to 30 mm thickness)	64.5

Tempering °C after Quenching	100	200	300	400	500	600
HRC	63.5	61.5	58	57.5	55	47