Alloys Steel – D2 | DIN 1.2379 | SAE J437 | UNS T30402 | NI KU | B.S. BD 2 | ASTM A681 | FED QQ-T-570

D2 (UNS T30402)/ 1.2379

DIN 2379 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.DIN 2379 is the superior steels than D3 due to high alloys properties.

 

Chemical Composition

The following table shows the chemical composition of D2 tool steels.

Element	Content (%)
C	1.50-1.60
Mn	0.15-0.45
Si	0.10-0.40
P	0.030 max
Cr	11.00-12.00
Mo	0.60-1.20
V	0.90-1.10
P	0.030 max
Ni	–
w	–

Physical Properties

The physical properties of D2 tool steels are outlined in the following table.

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

Stress Relieving

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

Heat Treatment

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

Mechanical Properties

The mechanical properties of D2 steels are tabulated below:

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

Forging

Forging of D2 steels can be done from 1065ºC (1950ºF) down to 954ºC (1750ºF). Do not forge below 926ºC (1700ºF).

Annealing

Annealing of D2 steels should be done at 871 to 898ºC (1600 to 1650ºF) followed by slow furnace cooling at 4.4ºC (40ºF) per hour or less.

Thermal Properties

The following table shows the thermal properties of D2 steels.

Properties		Conditions
		T (°C)	Treatment
Thermal expansion	10.4 x 10-6/ºC	20-100	–

 

© FountainHead Alloys 1996