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* Inconel/Incoloy and Monel are
Registered Trademarks of Special Metals Corporation and its subsidiaries.
Inconel 750 Technical Data
Description: Inconel 750 is a precipitation-hardenable alloy. The
alloy is highly resistant to chemical corrosion and oxidation and has high
stress-rupture strength and low creep rates under high stresses at
temperatures up to 1500 Degrees F (816 Degrees C) after suitable heat treatment.
Applications: Inconel 750 has been used in applications
such as high temperature structural members for gas turbines, jet engine
parts, nuclear power plant applications, heat-treating fixtures, forming
tools, and extrusion dies.
Specifications:
|
Rod |
ASTM B 637, ASME
SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS
5670, AMS 5671, AMS 5747, EN10269 |
|
Bar |
ASTM B 637, ASME
SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS
5670, AMS 5671, AMS 5747, EN10269 |
|
Forging Stock |
ASTM B 637, ASME
SB 637, ISO 9723, ISO9724, ISO9725, AMS 5667, AMS 5668, AMS 5669, AMS
5670, AMS 5671, AMS 5747, EN10269 |
|
Plate |
ISO 6208, AMS
5542 and AMS 5598 |
|
Sheet |
ISO 6208, AMS
5542 and AMS 5598 |
|
Strip |
ISO 6208, AMS
5542 and AMS 5598 |
|
Wire |
BS HR 505, AMS
5698, AMS 5699 |
|
Other |
UNS N07750, W.Nr
2.4669, Inconel X750 (tradename), UNS N07752 |
Rod, Bars and Forgings are available with the following heat treatments
AMS 5667 - 1625 Degrees F/24hr, AC + 1300
Degrees F/20 hr, AC (Equalising plus precipitation treatment). AMS 5667 Rod,
Bars and Forgings have high strength and notch rupture ductility up to 1100
Degrees F
AMS 5668 - 2100 Degrees F anneal + 1550
Degrees F/24 hr, AC, +1300 Degrees F/20hr, AC (triple heat treatment). AMS
5668 has maximum creep, relaxation and rupture strength above about 1100
Degrees F.
AMS 5670 - 1800 Degrees F anneal + 1350
Degrees F/8hr, FC to 1150 Degrees F. Hold at 1150 Degrees F for total
precipitation-treating time 18 hr, AC (solution treatment plus furnace cool
precipitation treatment). Due to the heat treatments AMS 5670, AMS 5671 and
AMS 5747 have increased tensile properties and reduced heat treatment time
service up to about 1100 Degrees F.
With a heat treatment of 1800 Degrees F anneal +
1400 Degrees F/1hr, FC to 1150 Degrees F, hold at 1150 Degrees F for total
precipitation-treating time of 6 hr, AC (solution treatment plus short
furnace-cool precipitation treatment). This treatment of short furnace cool
aging achieves only slightly lower properties than does AMS 5670 and AMS 5671.
Rods and Bars X-750 is available from 1/2"
diameter to 6" diameter in 1/4" increments. From 6" diameter to 10" diameter
it is available in 1/2" increments.
Billets for forging are available heat treated to
any specification.
UNS N07752 is available in billet for
forging. UNS N07752 has limits on the Carbon and Cobalt levels (each has a
maximum of 0.05%).
Sheet, Strip and Plate
are available with the following heat treatments
AMS 5542 - 1300 Degrees F/20hr, AC
(Constant-temperature precipitation treatment). AMS 5542 has high strength up
to 1300 Degrees F
AMS 5598 - 1350 Degrees F/8hr, FC to 1150
Degrees F, hold at 1150 Degrees F for total precipitation-treating time of
18hr, AC (furnace-cool precipitation treatment. AMS 5598 has high strength up
to 1300 Degrees F (Increased tensile properties to about 1100 Degrees F).
With heat treatment 1400 Degrees F/1hr, FC to 1150
Degrees F hold at 1150 Degrees F for total time of 6hr, AC (short furnace-cool
precipitation treatment). This treatment enables increased tensile properties
and reduced heat time for service up to about 1100 Degrees F.
Typical Mechanical Properties:
|
Size |
Ultimate Tensile Strength (ksi) |
0.2% Yield Strength (ksi) |
Elongation in 4D(%) |
% Reduction of Area |
|
Under 4.0" |
165.0 |
105 |
20 |
25 |
|
4.0" and over |
160.0 |
100 |
15 |
17 |
Properties as described in AMS 5667 which requires
that material following 1625ºF/24 hr, AC - Equalizing have the following
minimum room temperature properties. Hardness will lie in the range of
302-363 BHN.
Corrosion Resistance:
Alloy X-750 has excellent resistance to chloride ion stress-corrosion
cracking. It exhibits satisfactory resistance to numerous oxidizing
environments. The alloy has similar corrosion resistance to alloy 600 in many
media.
Heat Treatment:
Alloy X-750 is austenitic under all conditions. The alloy is heat treated by
several different methods depending upon the application or requirement. Two
common treatments are:
1. For maximum creep, relaxation and rupture strength at temperatures above
1100 Degrees F (593 Degrees C):
Solution Treatment - 2100 Degrees F (1149 Degrees C), 2 to 4 hrs, air cool.
Intermediate Age - 1550 Degrees F (843 Degrees C), 24 hrs, air cool.
Final Age -1300 Degrees F (704 Degrees C), 20 hrs, air cool.
2. For highest room temperature yield strength and tensile ductility:
Stress Equalization - 1625 Degrees F (885 Degrees C), 24 hrs, air cool.
Precipitation Age - 1300 Degrees F (704 Degrees C), 20 hrs, air cool.
Workability:
The furnace temperature should be 2100 Degrees F (1149 Degrees C)-for optimal starting
temperatures of 1950/2000 Degrees F. For service below 1100 Degrees F (593
Degrees C), higher strength
can be obtained by combining some cold work with heat treatment because the
effects are additive.
Machinabiliy
Alloy X-750 work hardens quickly and is more difficult to machine than most
standard ferritic and martensitic alloys. The alloy is most easily machined in
the stress-equalized condition. Because specific cutting forces are high, the
machine tools used must have ample power and the cutting speed should be slow.
The tools must have smooth finishes, be sharp, and be very rigid. To avoid
work hardening , a continuous, smooth cutting action should be maintained;
thus, the machines must have a minimum of backlash and the tool and workpiece
must be rigidly supported. If at all possible, avoid very small cuts and
feeds.
Welding
Alloy X-750 should be welded in the stress-equalized condition, 1625 Degrees F (885
Degrees C)
heat treatment, and solution treated and age hardened after welding has been
completed. If this is not practical, the alloy should be welded in the
solution-treated condition and age hardened after welding with or without the
inclusion of a short-period stress-relieving treatment at 1625 Degrees F. Weld joints,
because of softening of the alloy within the heat-affected zone, should be
located where lower creep properties are required.
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