25mm GH2747 Nickel Superalloy Round Bar with 1250°C Oxidation Resistance for High-Temp Furnace Parts

Explore high-purity 25mm GH2747 nickel-based superalloy round bars designed for superior structural reliability, exceptional high-temperature oxidation resistance up to 1250°C, and stringent dimensional accuracy in thermal processing applications.

Product Overview

GH2747 is an advanced Fe-Ni-Cr based precipitation-hardening superalloy formulated with optimized additions of aluminum and titanium to form a stable intermetallic strengthening network. Operating in prolonged thermal exposure zones up to 1100°C–1250°C, the alloy forms a dense, self-healing chromium-aluminum oxide protective scale that prevents rapid oxidation, gas carburization, and thermal degradation.

The 25mm diameter solid round bar is hot-forged and precision-machined, undergoing strict solution heat treatment to balance tensile strength with elongation. With enhanced resistance to thermal shock and cycle-induced microcracking, GH2747 serves as an ideal material upgrade where standard heat-resistant stainless steels and basic nickel alloys experience premature thermal failure.

Technical Specifications

Table 1: Nominal Chemical Composition of GH2747 Superalloy (%)

Table 2: Physical & Mechanical Properties of GH2747 Round Bar

Table 3: Dimensional Tolerances & Delivery Conditions (25mm Round Bar)

Core Performance

• Superior High-Temperature Oxidation Resistance (1250°C): Forms an ultra-adherent protective oxide layer under prolonged high-temperature exposure, preventing deep scaling and premature wall thinning in continuous furnace atmospheres.
• Robust Thermal Shock & Fatigue Durability: Maintains microstructural stability through repeated rapid heating and cooling cycles without surface cracking or embrittlement.
• Controlled Metallurgical Purity & Cleanliness: Double-refined through VIM+ESR melting technology to ensure ultra-low gas content (O, N, H) and minimal non-metallic inclusions, maximizing fatigue life under cyclic loads.
• Exceptional Machinability & Weldability: Features consistent plasticity for precision turning, milling, and thread cutting, with dependable joint integrity under specialized industrial gas shielding welding procedures.
• Tight Dimensional & Straightness Tolerances: Processed with automated straightening and centerless precision grinding to guarantee seamless feeding into CNC turning centers and automated manufacturing lines.

Industrial Applications

• Industrial Heat Treatment & Thermal Furnaces: Radiant heater tubes, heating element support fixtures, furnace rollers, carrier racks, and charging baskets subject to continuous high heat.
• Petrochemical & Gas Processing: Thermocouple protection wells, high-temperature valve stems, reactor internal brackets, and catalytic combustion chamber components.
• Aerospace & Gas Turbine Systems: Combustion chamber structural rings, flame stabilizers, transition duct supports, and thermal guide vanes.
• Power Generation & Metallurgical Equipment: Flue gas dampers, hot gas duct deflectors, burner nozzles, and high-temperature fastener blanks.

Why Source From DLX

• 1,200 Tons Monthly Capacity: Backed by a dedicated production complex yielding over 1,200 metric tons per month across high-temperature superalloys, precision resistance alloys, and corrosion-resistant grades, securing fast lead times for high-volume enterprise contracts.
• End-to-End Internal Quality Verification: Every batch of 25mm GH2747 round bars undergoes 100% full-length ultrasonic flaw detection, eddy current inspection, and direct-reading optical emission spectrometry to confirm zero internal voids, inclusions, or chemical segregation.
• Custom Metallurgy & Tailored Dimensions: Full OEM flexibility in customized chemistries, tight outer-diameter tolerances, specialized mechanical hardening, chamfering, and customized cut-to-length dimensions.
• Traceable Factory Inspection Certificates: Comprehensive quality test documentation—including actual chemical melt reports, room/high-temperature tensile test records, hardness profiles, and dimensional verification data—is supplied with each shipment.
• Heavy-Duty Export Packaging: Standard protective rust-inhibiting wrapping, heavy-duty wooden crates, and secure banding ensure zero mechanical distortion or surface abrasion during international maritime and air transit.

Frequently Asked Questions

Q1: What are the primary operating temperature boundaries for GH2747 round bars?

A: GH2747 is engineered to withstand continuous operating temperatures up to 1200°C and intermittent peak excursions up to 1250°C, demonstrating far superior oxidation resistance compared to conventional heat-resistant austenitic stainless alloys.

Q2: What is the minimum order quantity (MOQ) and production lead time for 25mm GH2747 bars? 

A: Our standard trial order MOQ starts from 50 kg for in-stock billet re-drawing, while dedicated custom melt batches typically require 200–500 kg depending on dimensional requirements. Standard production lead time ranges between 15 to 30 working days from technical sign-off.

Q3: How does DLX verify the internal integrity and surface quality of 25mm round bars? 

A: All round bars undergo 100% automated ultrasonic internal testing (UT) and surface defect inspection. Surface roughness is inspected with high-precision profilometers, and chemical compositions are certified using high-resolution spark OES spectrometers.

Q4: Can you provide custom cut lengths and specific surface finishes? 

A: Yes. We offer precision band-saw cutting to customized lengths from 50 mm to 6000 mm with deburred or chamfered ends. Surface treatments include black forged, hot-rolled pickled, smooth peeled, or centerless mirror ground (Ra ≤ 0.8 μm).

Q5: What documentation accompanies international bulk shipments?

A: Every shipment includes an official comprehensive Mill Test Certificate (MTC) detailing exact heat-number traceability, chemical composition analysis, room-temperature tensile/yield data, hardness measurements, dimensional inspection logs, and non-destructive testing reports.