Howrah's leading traders and suppliers of d2 and d3 die steel.
Application : Automobile Industry,
Construction, Pharmaceutical / Chemical Industry, Oil & Gas Industry, 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.
Coldwork tool steels include the highcarbon,highchromium steels or group D
steels. These steels are designated as group D steels and consist of D2, D3,
D4, D5, and D7 steels. These steels contain 1.5 to 2.35% of carbon and 12%
of chromium. Except type D3steel, all the other group D steels include 1% Mo
and are air hardened. Type D3 steel is oil quenched;though small sections
can be gas quenched after austenitization using vacuum. As a result, tools
made with type D3 steel tends to be brittle during hardening. Type D2 steel
is the most commonly used steel among the group D steels.
Equivalent Grades :
DIN 1.2379
NI KU
B.S. BD 2
ASTM A681
FED QQT570
SAE J437
SAE J438
UNS T30402
Chemical Composition :
C
Mn
Si
S
P
Cr
V
.35-.45
.60-1.00
.60
.03
.03
11.0-13.50
1
Fabrication and Heat Treatment Heat Treatment
D2 steels should be preheated very slowly to 815ºC (1500ºF) and
then temperature can be increased to 1010ºC (1850ºF). They are
then held at 1010ºC (1850ºF) for 20 to 45 minutes and air cooled
(air quenched).
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.
Tempering : D2 steels can be tempered at 204ºC (400ºF) for
achieving Rockwell C hardness of 61 and at 537ºC (1000ºF) for a
Rockwell C hardness of 54. Request Callback
Additional Information : Item Code: D-2
Application : Automobile Industry,
Construction, Pharmaceutical / Chemical Industry, Oil & Gas Industry
D3 is a high carbon, high chromium steel. Type D3 steel is oilquenched;
though small sections can be gas quenched after austenitization using
vacuum. As a result, tools made with type D3 steel tend to be brittle during
hardening.
Equivalent Grades :
AFNOR Z 200 C 12
DIN 1.2080
UNI X 21O Cr 13 KU
JIS SKD1
B.S. BD 3
ASTM A681
FED QQT570
SAE J437
SAE J438
Chemical Composition :
C
Mn
Si
S
P
Cr
2.0-2.30
.60
.60
.03
.03
11.0-13.50
Fabrication and Heat Treatment Heat Treatment :
D3 tool steel requires hardening and tempering to achieve maximum
properties. For maximum accuracy, the parts of D3 tool steel should be
stress relieved after roughing operations. Stress should be relieved at 648°C
(1200°F) for one hour and cooled slowly. Annealing : Annealing of D3 tool steel needs to be done in a
controlled atmosphere furnace. D3 tool steels should be heated thoroughly to
871°C (1600°F) and cooled slowly at a rate of notmore than 6°C
(20°F) per hour, until the furnace is black. Then the material should
be removed and air cooled.
Tempering : The D3 tool steel should be cooled to room temperature
and should be tempered immediately. The parts should be placed in the
tempering furnace and increased slowly tothe desired tempering temperature.
Tempering for 1 hour per inch of thickness is required.
Hardening : D3 tool steel should be heated properly since it is very
sensitive to overheating and if not heated maximum hardness cannot be
achieved. The work should be directly placed in afurnace preheated to 954°C
(1750°F) and soaked for 2025minutes, plus 5 minutes per inch of
thickness, and then oil quenched to harden it.
