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Alloy 800 / 800H / 800HT Nickel Alloy Round Bar Bright Polished With H6 H7 H9 H11 Tolerance
Products Specification
| Standard | AISI, ASTM, BS, DIN, GB, JIS |
| Grade | Monel series: 400 K500
Inconel series: 600 601 625 718 725
Incoloy series: 800 800H 825 925
Hastelloy series: B,B2,B3,C,C-276,C-4,C-22
Pure: Ni200, Ni201 |
| Specifications | Round bar | Diameter:4~300mm |
| Flat bar | Thickness | 1.0~100mm |
| Width | 1~1500mm |
| Square bar | Size: 4*4-100*100mm |
| Length | 2m, 5.8m, 6m, or as required. |
| Surface | Black, peeled, polishing, bright, sand blast, hair line, etc. |
| Price Term | Ex-work, FOB, CFR, CIF, etc. |
| Delivery Time | Standard size is in stock,prompt delivery or as order's quantity. |
Alloy 800 / 800H / 800HT Nickel Alloy Round Bar Bright Polished With H6 H7 H9 H11 Tolerance
In industrial sectors where extreme temperatures, corrosion, and precision converge, the choice of material directly determines operational reliability and longevity. Our Alloy 800 / 800H / 800HT nickel-iron-chromium alloy round bars—featuring bright polished finishes and strict H6, H7, H9, H11 tolerance grades—embody the pinnacle of high-performance engineering materials. Designed for seamless integration into critical systems across aerospace, energy, and chemical industries, these round bars combine tailored chemical compositions, robust mechanical properties, and meticulous manufacturing standards to meet the most demanding application requirements.
Core Material Advantages: Alloy 800 / 800H / 800HT
As members of the Incoloy family, these alloys share a foundation of nickel (30.0-35.0%), chromium (19.0-23.0%), and iron (minimum 39.5%) but are differentiated by precise elemental adjustments that optimize them for specific high-temperature scenarios . Their unique formulations deliver three key competitive advantages:
- 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
The following table details the critical distinctions between the three alloy grades, their dimensional precision, and finish standards:
| Specification | Alloy 800 | Alloy 800H | Alloy 800HT |
| Chemical Composition | C ≤ 0.10%; Al+Ti: 0.30-1.20% | C: 0.05-0.10%; Al+Ti: 0.40-0.90% | C: 0.06-0.10%; Al+Ti: 0.85-1.20% |
| Key Property | General high-temp strength | Enhanced creep resistance | Maximum creep-rupture strength |
| Tolerance Grades | H6, H7, H9, H11 | H6, H7, H9, H11 | H6, H7, H9, H11 |
| Surface Finish | Bright polished (Ra ≤ 0.8μm) | Bright polished (Ra ≤ 0.8μm) | Bright polished (Ra ≤ 0.8μm) |
| Standard Compliance | ASTM B408, ASME SB408 | ASTM B408, ASME SB408 | ASTM B408, ASME SB408 |
| Diameter Range | 5mm - 500mm | 5mm - 500mm | 5mm - 500mm |
| Length Options | 100mm - 3000mm (customizable) | 100mm - 3000mm (customizable) | 100mm - 3000mm (customizable) |
Note: All grades comply with UNS designations (Alloy 800: N08800; 800H: N08810; 800HT: N08811) and European standards (1.4876, 1.4958, 1.4959 respectively) .
Tolerance Grades: Precision Tailored to Applications
Our round bars adhere to ISO metric tolerance standards, with H6 to H11 grades ensuring compatibility with diverse assembly requirements. The bright polished finish not only enhances corrosion resistance by eliminating surface imperfections but also ensures consistent dimensional accuracy across batches:
- 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
These alloys excel in environments where conventional metals fail, supported by their proven track record in key sectors:
- 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
Every batch of round bars undergoes rigorous testing to ensure reliability:
- 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?
Beyond material performance, we deliver value through:
- 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.
Whether your project demands the precision of H6 tolerance or the high-temperature resilience of Alloy 800HT, our bright polished nickel alloy round bars provide a reliable solution backed by industry expertise and rigorous quality control.
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Alloy 800 / 800H / 800HT Nickel Alloy Round Bar Bright Polished With H6 H7 H9 H11 Tolerance Images
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