High-Temp Nickel Superalloy Bar Nimonic 75 Dia 20-150mm for Gas Turbines

DLX supplies high-integrity Nimonic 75 nickel-chromium superalloy round bars in diameter range 20-150mm. Specifically formulated for extreme thermal loads, gas turbine combustor components, and high-stress industrial furnace environments.

Nimonic 75 is an 80/20 nickel-chromium alloy with controlled additions of titanium and carbon, tailored for high-temperature service where exceptional fabricability and thermal endurance are required. The dense, self-healing chromium oxide (Cr₂O₃) scale developed on the alloy surface shields structural components from aggressive combustion gases, cyclic thermal shock, and carburizing atmospheres.

Our precision-forged and hot-rolled round bars (Dia 20–150mm) undergo full-length ultrasonic testing and surface finishing (peeled, ground, or bright-turned) to ensure zero internal voids, inclusions, or micro-cracks. With high ductility in cold and hot forming alongside reliable weldability, Nimonic 75 round bars reduce downtime and extend maintenance intervals in high-thrust turbines and heavy industrial heating systems.

• Diameter Range: 20.0 mm to 150.0 mm (Custom diameters available on demand)
• Length: 1000 mm – 6000 mm (Random, fixed, or precision-cut lengths)
• Dimensional Tolerance: Precision tolerance h9 / h10 / k11 or customized tight limits
• Surface Condition: Centerless Ground, Turned, Polished, or Hot-Forged Black Bar
• Internal Soundness: 100% Ultrasonic Testing (UT Class AA/A Defect-Free Level

• Continuous Oxidation Resistance up to 1000°C: The high-chromium content forms an adherent Cr₂O₃ passivating layer that withstands continuous thermal oxidation and dynamic hot gas flow.
• Superior Creep-Rupture Strength: Solid-solution matrix fortified with titanium carbide dispersoids preserves load-bearing capability under elevated thermal gradients.
• VIM + ESR Ultra-Pure Refining: Dual-vacuum melting ensures low sulfur, low oxygen, and clean grain boundaries, minimizing micro-segregation and thermal fatigue cracking.
• Exceptional Workability & Weldability: Excellent plastic deformation characteristics allow precision machining, forging, and reliable joining via TIG, MIG, and resistance welding methods.
• Dimensional Stability Under Thermal Cycling: Low distortion tendency when subjected to repetitive startup/shutdown thermal fluctuations inside combustion zones.

• Gas Turbine Combustion Systems: Flame tubes, combustion chamber liners, transition ducts, ring components, and fuel injector housings.
• Industrial Furnaces & Heat Treatment: Radiant heating tubes, thermocouple protection sheaths, furnace rollers, and high-temperature retorts.
• Aerospace & Power Generation: Afterburner components, exhaust ducting, and turbine stator rings.
• Chemical & Petrochemical Processing: High-temperature catalyst support grids, pyrolysis furnace internal parts, and thermal cracker fittings.
• Nuclear & Thermal Power: Structural fasteners, high-temperature seals, and thermal baffle supports.

• 1,200 Tons Monthly Capacity: Industrial-scale smelting, forging, hot rolling, and finishing lines provide stable batch-to-batch consistency and fast lead times for global engineering projects.
• Vacuum Smelting & Tight Traceability: Complete quality tracking from raw ingot selection, VIM/ESR melting, forging, and heat treatment to final inspection.
• Strict Non-Destructive Testing: Every round bar undergoes 100% ultrasonic testing, hydrostatic/eddy current verification, spectral chemical analysis, and dimensional verification before dispatch.
• Customized Engineering Formats: Flexible supply programs tailored to specific diameter requirements, tight straightness tolerances, cut-to-length billets, and specialized packaging (export wooden crates with anti-corrosion protection).

Q1: What makes Nimonic 75 particularly suited for gas turbine combustion chambers?
A1: Gas turbine combustors operate in extreme conditions involving high thermal gradients, cyclic fatigue, and oxidizing combustion gases. Nimonic 75 combines high creep strength, reliable ductility, and an exceptionally protective chromium-oxide layer, preventing premature structural deformation and scale spalling up to 1000°C.

Q2: What diameter range and surface finishes are available for DLX Nimonic 75 round bars?
A2: We supply Nimonic 75 round bars from Dia 20mm up to 150mm. Available surface finishes include peeled, precision-turned, centerless ground, and polished surfaces with tight dimensional tolerances (up to h9/h10).

Q3: How does DLX ensure internal soundness and defect-free quality in superalloy bars?
A3: All bars are produced through Vacuum Induction Melting (VIM) followed by Electroslag Remelting (ESR). We conduct 100% volumetric ultrasonic inspection, metallurgical grain size analysis, and full chemical spectroscopy on every production heat to ensure zero internal voids or inclusions.

Q4: Can Nimonic 75 round bars be welded easily for complex combustor assemblies?
A4: Yes. Due to its solid-solution strengthened single-phase matrix, Nimonic 75 possesses excellent weldability compared to gamma-prime precipitation-hardened superalloys. It can be joined using conventional GTAW (TIG) and GMAW (MIG) methods without susceptibility to strain-age cracking.