Inconel X-750 Round Bar
➡️ Alloy X-750 | UNS N07750 | EN 2.4669 | ASTM B637
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Nickel Alloy
UNS Number:
N07750
Wr. No.:
2.4669
MTC Available:
EN 10204 3.1
Product Description for Inconel X-750 Round Bar
Inconel X-750 Round Bar is made from a precipitation-hardenable nickel-chromium alloy strengthened by titanium, aluminium and niobium. It is designated UNS N07750 and 2.4669 (NiCr15Fe7TiAl). Bars are supplied to AMS 5667 and related AMS specifications, and to ASTM B637.
The alloy has high strength and creep resistance up to about 700°C and good oxidation resistance up to about 980°C. It keeps good toughness at cryogenic temperatures.
Different heat treatments give different property balances for springs, bolts and high-temperature parts.
Bars are supplied solution treated, equalised or fully heat treated. The alloy is non-magnetic.
Common applications include gas turbine parts, springs, bolts, fasteners, nuclear reactor parts, extrusion dies, rocket engine parts and high-temperature tooling. X-750 is one of the oldest age-hardenable nickel alloys still in wide use, and it has a long record in aerospace, nuclear and industrial service. Its strength comes from titanium, aluminium and niobium, which form fine precipitates during ageing. It resists relaxation well at moderate high temperature, so it is chosen for springs, seals and bolts that must keep their load when hot. Its oxidation resistance also suits parts exposed to hot air and combustion gases. Because several heat treatment routes are used, the order must name the governing specification and condition, not only the alloy name. Bars are supplied in the solution treated or equalised condition when the customer will machine and age the parts, or fully aged for direct use. The choice of AMS specification should follow the service temperature, and the heat treatment batch should be marked on each bar.
Common Applications of Inconel X-750 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Alloy X-750 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N07750
ASTM / ASME / SAE
USA
ASTM B637 / ASME SB637 / SAE AMS 5667–5671
EN 10269 / DIN
Europe
2.4669 (NiCr15Fe7TiAl)
GB/T 14992
China
GH4145 / GH145
JIS G4901
Japan
NCF 750
KS D 3712
South Korea
N24669 / SNCF750
AFNOR
France
NC 15 FeT
BS
UK
HR 505
Technical Specification for Inconel X-750 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
X-750 / UNS N07750 / 2.4669
-
Standard
AMS 5667, ASTM B637
-
Product Form
Round bar / rod
-
Diameter (supply range)
6–250
mm
Length (random)
1–6
m
Manufacturing Process
Hot rolled, forged, extruded or cold drawn
-
Surface Finish
Descaled, pickled, peeled, turned, ground or bright
-
Heat Treatment / Delivery Condition
Solution treated, equalised or fully heat treated
-
Tolerance Standard
Per AMS 5667 / ASTM B637
-
Density
8.28
g/cm³
Melting Range
1393–1427
°C
Thermal Conductivity at 20°C
12.0
W/m·K
Coefficient of Thermal Expansion 20–100°C
12.6
µm/m·K
Specific Heat at 20°C
431
J/kg·K
Electrical Resistivity at 20°C
1.22
µΩ·m
Modulus of Elasticity at 20°C
214
GPa
Magnetic Properties
Non-magnetic
-
Testing / Inspection
Chemical analysis, tensile, hardness, dimensional, UT and PMI on request
-
Certification
EN 10204 3.1 mill test certificate (3.2 on request)
-
Technical Specifications
Get the key technical specifications for Inconel X-750 Round Bar
Inconel X-750 Round Bar is supplied to AMS 5667 (equalised and precipitation hardened) and other AMS specifications, or to ASTM B637. The order must state the specification and heat treatment.
A common treatment is equalising at about 885°C for 24 hours with air cooling, then ageing at about 704°C for 20 hours with air cooling.
Physical values for X-750 are reference data for the aged condition.
Testing includes chemical analysis, tensile, hardness and dimensional checks, with stress-rupture, UT and third-party inspection on request.
Different AMS specifications give X-750 different property balances. AMS 5667 uses equalising and precipitation hardening for parts used up to about 593°C, such as bolts and springs. AMS 5668 uses a higher solution treatment, a stabilising step and precipitation hardening for parts used above about 593°C, where creep and rupture strength matter more. Other specifications cover spring wire and special nuclear heat treatments. Choose the specification that matches the service temperature, and state it on the order. For nuclear parts, users often add their own requirements for grain boundary carbides and heat treatment, which should be copied into the order.
Chemical Composition for Inconel X-750 Round Bar
Element
Symbol
Min
Max
Unit
Nickel (incl. Cobalt)
Ni
70.0
-
%
Chromium
Cr
14.0
17.0
%
Iron
Fe
5.0
9.0
%
Titanium
Ti
2.25
2.75
%
Aluminium
Al
0.40
1.00
%
Niobium + Tantalum
Nb + Ta
0.70
1.20
%
Carbon
C
-
0.08
%
Manganese
Mn
-
1.00
%
Silicon
Si
-
0.50
%
Sulfur
S
-
0.01
%
Copper
Cu
-
0.50
%
Cobalt
Co
-
1.00
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy X-750 Round Bar
The table shows the ASTM B637 limits for UNS N07750.
Chromium at 14–17% provides oxidation and corrosion resistance. Nickel forms the matrix.
Titanium, aluminium and niobium form the gamma prime strengthening phase during ageing, giving high strength and creep resistance.
Iron at 5–9% is part of the design. Carbon and other residuals are limited. Titanium at 2.25–2.75% is the main strengthening element. With aluminium at 0.40–1.00%, it forms the gamma prime phase during ageing, and niobium plus tantalum at 0.70–1.20% adds to this strengthening. Nickel of at least 70% gives a stable, tough matrix down to cryogenic temperatures. Chromium at 14–17% is lower than in Alloy 718 or Nimonic 80A, so oxidation resistance is good but not the best of the group. Iron at 5–9% is a planned part of the alloy. Carbon is limited to 0.08% maximum, and sulfur to 0.01%, to protect ductility and grain boundary strength. Cobalt is limited to 1.00% maximum, which is important for nuclear service, where cobalt can become radioactive.
Manganese is limited to 1.00% and silicon to 0.50%, and copper to 0.50%, so they do not upset the ageing response or reduce hot ductility.
Mechanical Properties for Inconel X-750 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (AMS 5667, equalised and aged)
≥ 1138
MPa
Yield Strength 0.2% (AMS 5667)
≥ 724
MPa
Elongation (AMS 5667)
≥ 20
%
Reduction of Area (AMS 5667)
≥ 25
%
Hardness (AMS 5667)
302–363
HB
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy X-750 Round Bar
The values shown are AMS 5667 requirements for bar in the equalised and precipitation-hardened condition.
Other heat treatments give different balances of strength, creep resistance and ductility.
Confirm the ordered heat treatment and results on the mill certificate. AMS 5667 requires equalised and aged X-750 bar to reach tensile strength of at least 1138 MPa, yield strength of at least 724 MPa, elongation of at least 20%, reduction of area of at least 25% and hardness of about 302–363 HB. The AMS 5668 condition gives lower room-temperature strength but better creep and rupture life at high temperature. For springs, the cold work and ageing cycle strongly affect relaxation resistance, so spring makers should specify both. Toughness at cryogenic temperatures is good, which is why X-750 is also used in rocket engine parts. Design data for creep, relaxation and fatigue should come from the producer or the governing specification.
Rupture and creep strength fall quickly above about 700°C, where Nimonic 90 or Waspaloy-type alloys are used instead. For bolts, the thread form and rolling after ageing can improve fatigue life, and relaxation data should be used for preload design.
Dimension / Sizes for Inconel X-750 Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
6–250
mm
Standard Length (random)
1–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Per AMS 5667 / ASTM B637
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per ordered specification or as agreed
-
End Condition
Saw cut square, chamfered or as ordered
-
Surface Finish
Hot finished, descaled, pickled, peeled, turned, centreless ground or cold drawn bright
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy X-750 Round Bar
Pricing for Inconel X-750 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Inconel X-750 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
Should I choose X-750 or Alloy 718?
What is the difference between AMS 5667 and AMS 5668 for X-750?
Why is X-750 used for high-temperature springs?
Is X-750 suitable for nuclear reactors?
How is X-750 heat treated, welded and machined?
What are the limits of X-750?
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