1. Alloy 800 / 800H / 800HT Nickel Alloy Round Bar Bright Polished With H6 H7 H9 H11 Tolerance

Products Specification

Alloy 800 / 800H / 800HT Nickel Alloy Round Bar Bright Polished With H6 H7 H9 H11 Tolerance

Core Material Advantages: Alloy 800 / 800H / 800HT

• Superior High-Temperature Stability: All three alloys resist oxidation and carburization, with operational thresholds ranging from 815°C (1500°F) for Alloy 800 to even higher temperatures for 800H and 800HT, making them ideal for continuous service in furnace environments and thermal processing equipment .
• Enhanced Corrosion Resistance: The balanced nickel-chromium matrix provides exceptional resistance to oxidizing/reducing environments, stress-corrosion cracking in aqueous systems, and sulfur-containing media—critical for chemical reactors and nuclear components .
• Controlled Mechanical Performance: From Alloy 800’s reliable baseline strength to 800HT’s enhanced creep-rupture resistance (enabled by optimized aluminum and titanium content), each grade offers targeted durability for its intended use case .

Key Specifications Comparison

Tolerance Grades: Precision Tailored to Applications

• H6 (Tight Precision): For critical components like aerospace engine parts, where diameter deviations are limited to ±0.009mm (for 10mm diameter). Ideal for high-pressure systems requiring leak-proof fits.
• H7 (General Precision): The most versatile grade, used in nuclear steam generator tubing and chemical reactor valves. Balances accuracy (±0.015mm for 10mm diameter) with cost-effectiveness.
• H9 (Moderate Precision): Suited for furnace radiant tubes and heat exchanger components. Allows deviations of ±0.036mm (for 10mm diameter) while maintaining structural integrity.
• H11 (Economic Precision): For non-critical structural parts like support fixtures, with a deviation range of ±0.09mm (for 10mm diameter) that reduces manufacturing costs without compromising performance.

Industrial Applications: Where Performance Matters

• Aerospace & Defense: Alloy 800HT round bars fabricate engine exhaust components and afterburner parts, leveraging their 980°C peak temperature resistance and weldability .
• Energy Sector: Nuclear power plants rely on Alloy 800 for steam generator tubing, while 800H/800HT serve in fossil fuel plant superheaters—resisting creep under prolonged heat .
• Chemical Processing: All grades construct reaction vessels, acid-resistant pipes, and catalyst baskets. Alloy 800HT’s sulfur resistance makes it ideal for petrochemical cracking units .
• Heat Treatment Equipment: Muffles, retorts, and furnace trays use 800H/800HT due to their ability to withstand repeated thermal cycling without embrittlement .

Quality Assurance & Compliance

• Chemical analysis via X-ray fluorescence (XRF) to verify elemental composition within ASTM B408 limits.
• Dimensional inspection with digital calipers and micrometers to confirm tolerance adherence.
• Mechanical testing (tensile strength, creep rupture) at elevated temperatures—Alloy 800HT typically achieves 450MPa tensile strength at 650°C .
• Surface quality checks using profilometers to guarantee bright polished finish consistency.

Why Choose Our Alloy Round Bars?

• Customization: Diameter, length, and tolerance grade adjustments to match unique project needs.
• Traceability: Full batch documentation, including mill certificates and test reports.
• Global Availability: Stocked in regional warehouses to ensure timely delivery for emergency maintenance.

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