Incoloy 800H Supplier: Round Bar, Seamless Tube & Plate | Shanghai Hangbo Alloy Group

Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified source supplier and global supplier of Incoloy 800H (UNS N08810), providing precision-quality round bars, seamless tubes, and plates for petrochemical, power generation, and high-temperature process equipment industries.

Quick Answer: What Is Incoloy 800H?

Incoloy 800H (UNS N08810) is a nickel-iron-chromium alloy — a controlled-composition version of Incoloy 800 — specifically engineered for superior creep and stress-rupture strength at temperatures above 600°C (1112°F). The key differences from standard Incoloy 800 are:

• Higher carbon content (0.05–0.10%) to strengthen the grain boundaries
• Controlled grain size (ASTM No. 5 or coarser) to maximize long-term creep resistance

It is listed in ASME Boiler and Pressure Vessel Code and widely used for furnace tubes, pigtails, and heat exchanger components in hydrogen reforming and ethylene cracking plants.

Key standards: ASTM B408 (bar), ASTM B163 (condenser/heat exchanger tube), ASTM B407 (pipe), ASTM B409 (plate), ASME SB-163 / SB-407 / SB-408 / SB-409

Why Engineers Choose Incoloy 800H

Shanghai Hangbo Alloy Group: Product Forms & Manufacturing Process

Incoloy 800H Round Bars

Manufacturing route: EAF → VIM (or AOD) → hot forging → solution annealing at minimum 1149°C → controlled cooling to achieve grain size ≥ ASTM No. 5 → peeling / grinding.

• Diameter range: 10 mm – 500 mm
• Surface finish: Black, peeled, ground, or polished
• Standards: ASTM B408, ASME SB-408
• QC: Grain size verification (ASTM E112), tensile/yield/elongation test, UT

Incoloy 800H Seamless Tubes & Pipes

Manufacturing route: Hot-extruded billet → cold drawing / cold rolling → solution annealing (≥ 1149°C) → grain size verification → straightening → NDT.

• OD range: 6 mm – 219 mm | Wall: 1.0 mm – 20 mm
• Standards: ASTM B163, ASTM B407, ASME SB-163, ASME SB-407
• Testing: 100% hydrostatic + eddy current test; grain size per ASTM E112

Incoloy 800H Plates & Sheets

Manufacturing route: Hot rolling → solution annealing at ≥ 1149°C → pickling → precision levelling.

• Thickness: 1.5 mm – 100 mm | Width: up to 2,500 mm
• Standards: ASTM B409, ASME SB-409
• QC: UT per ASTM A578; grain size check on each heat

Chemical Composition (ASTM B408 / ASTM B409)

800H is distinguished by its controlled carbon; 800HT adds tighter Al+Ti control for even better performance above 700°C.

Mechanical & Physical Properties (Annealed at ≥ 1149°C)

Typical Applications by Industry

• Petrochemical: Steam methane reformer (SMR) pigtails and headers, ethylene cracking furnace tubes, dehydrogenation heaters
• Power Generation: Superheater and reheater tubes, waste heat recovery units
• Thermal Processing: Radiant tubes, muffle furnace components, furnace rolls
• Nuclear: Steam generator channels, reactor internals (where long-term creep is a design criterion)
• Chemical: High-temperature heat exchangers, ammonia reformers

Quality Assurance at Shanghai Hangbo Alloy Group

1. Controlled high-temperature anneal: All 800H products annealed at ≥ 1149°C with furnace records proving time-at-temperature
2. Mandatory grain size check: Each heat verified to ASTM grain size No. 5 or coarser per ASTM E112 — the defining requirement for 800H vs. standard 800
3. Chemistry verification: OES spectral analysis of every heat for C content (0.05–0.10%)
4. NDT on all tubes: 100% hydrostatic + ECT; UT on bar stock
5. ASME compliance documentation: Full MTC per EN 10204 3.1; ASME SB material compliance statement available

Frequently Asked Questions (FAQ)

What is the critical difference between Incoloy 800, 800H, and 800HT?

All three share the same base Ni-Fe-Cr composition, but differ in carbon content and heat treatment:

• Incoloy 800: C ≤ 0.10%, no grain size requirement — general-purpose
• Incoloy 800H: C = 0.05–0.10%, grain size ≥ ASTM No. 5 — optimised for creep strength above 600°C
• Incoloy 800HT: Same as 800H, but Al+Ti restricted to 0.85–1.20% — best performance above 700°C

For any ASME high-temperature pressure vessel application above 600°C, always specify 800H or 800HT, not standard 800.

Why does grain size matter for Incoloy 800H?

Coarser grain sizes (≥ ASTM No. 5) reduce grain boundary area, which slows diffusion-based creep deformation and improves long-term stress-rupture life at high temperatures. This is why grain size is a mandatory specification for 800H — not just a quality indicator.

Can Incoloy 800H be used in hydrogen environments?

Yes. Incoloy 800H has good resistance to hydrogen embrittlement and high-temperature hydrogen attack. It is widely specified for steam methane reformer pigtails that operate in H₂/H₂O/CH₄ mixed atmospheres at 850–950°C.

Contact Shanghai Hangbo Alloy Group

Get a quote within 10 minutes.

🌐 Website: www.nickel-alloy.com

📧 Email: specialalloy001@gmail.com

📱 WhatsApp / Phone: +86 13611656360

📍 Headquarters: Shanghai, China | Agents in 32 countries worldwide

Related grades: Incoloy 825 | Incoloy 925 | Incoloy 926 | Incoloy 800HT | Inconel 625 | Inconel 718

Shanghai Hangbo Alloy Group Co., Ltd. — Founded 2012 | ISO 9001:2015 | Specializing in Nickel Alloys, Superalloys & Special Metals

Contact Shanghai Hangbo Alloy Group

Production Process

Our material is manufactured using VIM (Vacuum Induction Melting) + VAR (Vacuum Arc Remelting) or ESR (Electroslag Refining) processes to ensure ultra-high purity and metallurgical integrity. The material undergoes precision machining and rigorous heat treatment (Solution Annealing/Aging) to achieve the specified mechanical properties and grain size consistency.

Testing & Inspection

To guarantee zero-defect delivery, all batches undergo comprehensive testing:

• UT/PT Flaw Detection: Ultrasonic and Penetrant testing to identify surface and internal defects.
• Mechanical Testing: High and low temperature tensile testing, impact testing, and hardness verification.
• Corrosion Testing: Intergranular corrosion tests and pitting resistance verification according to ASTM standards.

Quality Control

We implement a total quality management system with full-process traceability from raw material to finished product. All products are manufactured in strict compliance with ASTM, ASME, and AMS standards, accompanied by EN 10204 3.1/3.2 certificates.

Market Pain Points & Solutions

• Delivery Consistency: We address supply chain delays by maintaining a large inventory of raw billets and semi-finished products, ensuring rapid response times.
• Extreme Environment Tolerance: Our specialized melting processes ensure that our alloys maintain structural stability in highly corrosive and high-pressure environments where standard materials fail.

Deep Application Insights

• Petrochemical: Used in flare stacks and flare tips where resistance to high temperatures and sour gas corrosion is critical.
• Nuclear Power: Applied in reactor core components and control rod mechanisms due to its excellent radiation resistance and mechanical stability.
• Aerospace: Found in engine exhaust systems and turbine shroud rings where high fatigue strength and oxidation resistance are required.

Product Forms & Standards Comparison