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.
