Inconel X-750 Round Bar | AMS 5667 | UNS N07750 | DIN 2.4669

PM Industries manufactures, supplies, and stocks Inconel X750 Round Bar (UNS N07750). It's a precipitation-hardenable nickel-chromium alloy strengthened by aluminum and titanium additions that form gamma-prime precipitates during age hardening. X750 is one of the older members of the Inconel family, with a long history in aerospace and nuclear applications dating back to the 1940s. That history means its properties are very well characterized across a wide range of service conditions, which gives engineers confidence when specifying it for critical applications.

What distinguishes X750 from other age-hardenable nickel alloys like 718 is its combination of good high-temperature strength with particularly good spring and relaxation properties. Springs and fasteners that must maintain their mechanical load over long periods at elevated temperatures need an alloy that doesn't relax significantly under sustained stress. X750 handles that requirement well, which is why it's been a standard spring alloy in gas turbine and aerospace applications for decades.

Temperature range versatility is genuine. X750 maintains useful mechanical properties from cryogenic service down to liquid hydrogen temperatures, where toughness rather than strength is often the constraint, through elevated-temperature service up to approximately 700°C. Few alloys cover that full range dependably, which explains why X750 appears in both cryogenic storage hardware and hot-section aerospace components.

Spring relaxation resistance is the property that makes X750 the preferred material for high-temperature springs and spring-loaded components. A spring that loses load over time under heat changes the behavior of the system it's in. In turbine seals, fuel control systems, and pressure-loaded assemblies, that relaxation can directly affect performance or safety margins. X750 maintains spring force more effectively under those conditions than most competing alloys at equivalent strength levels.

Fatigue performance supports the rotating and dynamically loaded component applications common in aerospace and power generation. X750 is used for turbine blades, vanes, and structural hardware that cycle through stress continuously during operation. Its fatigue strength supports the inspection intervals that operators require.

Nuclear service is a significant application area. X750 is used for reactor internals, hold-down springs, and structural components in both pressurized water and boiling water reactor designs, where radiation resistance, corrosion performance in high-temperature water, and long-term mechanical reliability are all required simultaneously.

Bar is available in solution-annealed and aged conditions across a range of diameters and surface finishes with full material certification to ASTM B637, AMS 5542, AMS 5667, AMS 5668, and applicable specifications. Contact PM Industries for stock availability, dimensions, and pricing.

Specification Inconel X-750 Round Bar

Specification	ASTM, EN, DIN, JIS, BS, ASME, AISI
Condition	Hardened & tempered, annealed
Length	1 to 6 Meters, Custom Cut Lengths
Round Bars	Outside Diameter in the range of 4mm to 500mm above as per the customer requirement.
Bright Bars	Outside Diameter in the range of 4mm to 500mm above as per the customer requirement.
Hex Bars	18mm – 57mm (11/16″ to 2-3/4″) above as per the requirement.
Square Bars	18mm – 47mm (11/16″ to 1-3/4″) above as per the requirement.
Flat Bars	1/2” to 10” in thickness range of 2mm to 150mm
Finish	Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish
Technique	Hot Rolled, Cold Rolled, Cold Drawn, Forged Round Bar, Rod
Tolerance	H8, H9, H10, H11, H12, H13, K9, K10, K11, K12 or as per clients’ requirements
Test Certificates	EN 10204/3.1B, NACE MR0103, NACE MR0175
Raw Materials Certificate	100% Radiography Test Report
Inspection	Third Party Inspection Report, etc

Available Types

UNS N07750 Surface finish

CD	Cold drawn	P	Polished
BD	Bright drawn	SRE	Slit rolled edge
CG	Centreless ground	HF	Hot finished
CF	Cold finished	HRAP	Hot rolled annealed and pickled
P&T	Peeled and turned	RT	Rough turned/peeled
ST	Smooth turned	PR	Peeled and reeled

Inconel X-750 Round Bar Price Per KG

Type	SIZES (mm)	SIZES (Inches)	ISO Tolerance
Cold Drawn and Polish	3.00 – 75.00	1/8” – 3.00”	h8-h9-h10-h11, ASTM B637
Cold Drawn and Ground	10.00 – 75.00	5/6” – 2.50”	h8-h9-h10-h11
Peeled and Polished	40.00 – 150.00	1.50” – 6.00”	h11, ASTMA-484 h11-DIN 1013
Peeled and Ground	20.00 – 50.00	3/4″ – 2.00”	h9-h10-h11, ASTM B637

ASTM B637 UNS N07750 bar Ready Shape and Form

Hollow	Rod	Round Rod	Precision Ground Bars	Rings	Flat Bars	Channel Bars	T-Bars	Round	Square	Blocks
Rectangle	Threaded	Billet	Half Round Bars	I/H Bars	Triangle	Forging	Hex (A/F)	Profiles	Rectangular Bar	Ingot

UNS N07750 Welding Rod Tolerances

Section/Shape	diameter, width or Size across flats	variation Permitted
	millimeter	millimeter
Flat (thickness)	< 18 > 30 ≦ 50 > 18 ≦ 30 > 50 ≦ 80	+ 0 to - 00.110 + 0 to - 00.250 + 0 to - 00.130 + 0 to - 00.350
Square and hexagon	> 18 ≦ 30 ≥ 6 ≦ 18 > 30 ≦ 50 > 80 ≦ 105 > 50 ≦ 80	+ 0 to - 00.110 + 0 to - 00.090 + 0 to - 00.130 + 0 to - 00.250 + 0 to - 00.160
Round	> 18 ≦ 30 ≥6 ≦ 18 > 30 ≦ 50 > 80 ≦ 100 > 50 ≦ 80	+ 0 to - 00.085 + 0 to - 00.070 + 0 to - 00.100 + 0 to - 00.140 + 0 to - 00.120
Flat (width)	< 18 > 30 ≦ 50 > 18 ≦ 30 > 50 ≦ 80 > 160 ≦ 320 > 100 ≦ 130 > 80 ≦ 100 > 130 ≦ 160	+ 0 to - 00.110 + 0 to - 00.160 + 0 to - 00.130 + 0 to - 00.190 + 1.00 to - 1.00 + 0 to - 00.350 + 0 to - 00.220 + 0 to - 1.00

Inconel x750 Round Bar Condition

H&T	Hardened and tempered.
ANN	Annealed
PH	Precipitation hardened.