|
Typical analysis
%
|
|
C
.04
|
Mn
.50
|
S
.08
|
Cr
14.75
|
|
|
Ni
4.50
|
Cu
3.20
|
Cb
.25
|
|
|
Delivery
condition
|
Prehardened to 38-42RC
Hardness is Uniform
|
|
Color code
|
White
|
Ultrachem® is a
chromium-nickel precipitation-hardening stainless steel, a modified PH alloy
grade, which is characterized by
- Exceptional corrosion
resistance
- Uniform hardness in all
dimensions
- Excellent compressive
strength
- Simple low temperature
heat treatment with small dimensional change
- Good weldability
- Excellent toughness
Ultrachem® is normally
supplied in a fully heat treated condition, age hardened to 38 or 42 HRC.
Age-hardening has a number of advantages:
- distortion is virtually
eliminated—only a small, predictable shrinkage is experienced (approx.
0.0005 in. per in.)
- uniform hardness
throughout thick sections, with minimum risk of cracking
- no scale or
decarburization of the part
Ultrachem's® excellent
corrosion resistance reduces both mold maintenance costs and production costs.
Consistently high molding productivity is assured since cooling channels are
not subjected to corrosion and loss of cooling efficiency.
Ultrachem® is
recommended for use in longlife molds subjected to severe working conditions,
including corrosive materials and atmospheres, high stressed and indentation
experienced in today's fast cycling molding operations.
Ultrachem® is
recommended for the ultimate mold base, cavities for plastics, and rubber
molds. Ultrachem provides a complete stainless mold with corrosion
resistance.
|
PHYSICAL DATA
Age-hardened to 42 HRC.
Data at room and elevated temperatures.
|
Temperature
|
68°F
(20°C)
|
390°F
(200°C)
|
750°F
(400°C)
|
|
Density
kg/m3
lbs/in3
|
7,800
.284
|
7, 750
.282
|
7,700
.280
|
|
Modulus
of elasticity
N/mm2
psi
|
196,000
28.5X106
|
185,000
27.0X106
|
174,400
25.4X106
|
|
Coefficient of thermal expansion
/°C from 20°C
/°F from 68°F
|
-
-
|
10.8X10-6
6.0X10-6
|
11.7X10-6
6.5X10-6
|
|
Thermal
conductivity
W/m °C
Btu in/(ft2h°F)
|
112
|
129
|
149
|
|
Specific heat
J/kg °C
Btu/lb °F
|
460
0.110
|
-
-
|
-
-
|
Impact
Strength
Typical values. Age-hardened condition at 42 HRC.
|
Testing temperature
68°F (20°C)
|
ft/lbs
|
joules
|
|
Impact strength
|
25
|
30
|
Tensile
strength
Typical values. Age
hardened condition at 42 HRC.
|
Testing temperature
68°F (20°C)
|
p.s.i
|
N/mm2
|
|
Tensile strength
|
190,000
|
1310
|
|
Yield strength
|
175,000
|
1208
|
|
Reduction of
area
|
50%
|
|
Elongation in
2"
|
14%
|
The corrosion resistance of
Ultrachem® makes it highly resistant to rusting from water and
humidity. Cooling channels will remain clean indefinitely for maximum cooling
efficiency. It can be safely stored without surface deterioration. It better
resists corrosion from the more highly corrosive plastics than AISI 420
stainless steels.
Weld overlays of worn areas
and repair welds up to 1" deep can be made on Ultrachem® in
the aged condition using shielded metal arc welding with W17-4 PH electrodes.
In contrast to other die holder block steels no preheating is required to
produce sound welds in Ultrachem®, regardless of its
pre-weld condition. However, welds should be stress relieved at 900°F for
1 hour per inch of thickness after welding.
STOCK—Sizes up
to 8" thickare available from warehouse stock, saw cut to cstomer's width and length. sizes abouve 8" can be produced to customer's exact requirements as individual forgings from billet stock.
SERVICES—Saw
cutting, Blanchard grinding up to 120" diameter and surface grinding up to
40" x 192".
|
