Inconel 750 Tech Data, Inconel 750, Nickel 750 Sheet 750 Plate 750 Pipe 750 Tube 750 Tubing 750 Rod 750 Bar AMS 5542, AMS 5598, AMS 5667, AMS 5668, AMS 5670 AMS 5671 AMS 5747 ASTM-B-637 UNS N07750 Nickel Sheet Alloys 200, 400, 600, 601, 617, 625, 718, 750

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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 1625ļF/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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