Durable Incoloy 800H Alloy Bar for High Temperature Boilers and Power Plant Equipment

1. Product Information‌

‌Product Name‌: Incoloy 800H Bar (High-Temperature Creep-Resistant Grade)
‌Material Type‌: Nickel-Iron-Chromium Superalloy (Austenitic, High-Carbon Variant)
‌Standards‌: ASTM B408, ASME SB408, AMS 5766, UNS N08810, DIN 1.4958
‌Forms Available‌: Hot-rolled bars, forged bars, and cold-finished precision ground bars.
‌Diameter Range‌: 10 mm to 300 mm (customizable up to 500 mm for forged applications).
‌Surface Finish‌: Black oxide, turned, ground (Ra ≤ 0.6 μm), or electropolished.
Operating Temperature‌:

• Continuous service: Up to 925°C (1700°F)

• Short-term exposure: 1150°C (2100°F) for <100 hours

Certifications‌: ASME Section VIII Div.1, PED 2014/68/EU, NACE MR-0175 for sour gas environments.

‌2. Characteristics‌

Incoloy 800H bars are engineered for extreme thermal stability and mechanical resilience in aggressive industrial environments:

• ‌Superior Creep Rupture Strength‌: Achieves 10,000-hour rupture life at 800°C/35 MPa, outperforming standard Incoloy 800 by 40%.

• ‌Oxidation Resistance‌: Forms a dual-layer Cr₂O₃-Al₂O₃ oxide scale with oxidation rates <0.1 g/m²·h at 900°C in air.

• ‌Carburization Resistance‌: Limits carbon penetration to <0.5 mm after 20,000 hours in hydrocarbon atmospheres (ac₃ <0.3).

• ‌Thermal Fatigue Resistance‌: Thermal expansion coefficient of 14.5 μm/m·°C (20–600°C) minimizes stress during cyclic heating.

• ‌Phase Stability‌: No sigma-phase formation even after 15,000 hours at 850°C, retaining 25% elongation.

• ‌Weldability‌: Compatible with TIG and laser welding (AWS A5.14 ERNiCr-3 filler recommended).

‌3. Technology‌

‌Manufacturing Process‌:

• ‌Vacuum Induction Melting (VIM)‌: Ensures ultra-low impurities (S < 0.005%, P < 0.015%).

• ‌Hot Forging‌: Performed at 1100-1200°C to achieve ASTM grain size 3-5.

• ‌Heat Treatment‌:

• Solution annealing at 1175-1200°C (2150-2200°F) with rapid argon quenching.

• Stabilization annealing at 850°C (1560°F) for 4 hours to optimize carbide distribution.
  ‌Quality Control‌:

• Ultrasonic testing (UT) per ASTM A388 to detect internal flaws >1 mm.

• High-temperature tensile testing per ASTM E21 at 800°C.

• Electron backscatter diffraction (EBSD) for grain orientation analysis.

‌4. Theory‌

The alloy’s performance is governed by its unique metallurgical architecture:

• ‌Carbon-Enhanced Strengthening‌: Controlled C content promotes (Ti,Al)C intragranular carbides that pin dislocations and delay creep void nucleation.

• ‌Aluminum-Chromium Synergy‌: Al enhances oxide layer adhesion, while Cr ensures rapid repassivation in oxidizing atmospheres.

• ‌Nickel Matrix Stability‌: High Ni content suppresses ferrite formation, maintaining austenitic ductility under thermal cycling.

• ‌Grain Boundary Engineering‌: Coarse grain structure (ASTM 3-5) reduces grain boundary sliding at >800°C.

• ‌Dynamic Recrystallization‌: Hot working parameters refine grain boundaries, improving fracture toughness by 15% over cast equivalents.

‌5. Application‌

Incoloy 800H bars are critical in industries requiring prolonged high-temperature operation:

• ‌Petrochemical‌:

• Ethylene cracking furnace tubes, reformer headers, and pyrolysis coil hangers.

• Support grids for hydrocracker reactors (operating at 750°C/70 bar).

• ‌Power Generation‌:

• Steam turbine bolts, superheater tube hangers, and boiler baffle plates.

• Gas turbine combustor liners and exhaust ducting.

• ‌Heat Treatment‌:

• Fixtures for carburizing furnaces (950°C) and sintering furnace trays.

• ‌Chemical Processing‌:

• Reactor agitator shafts in nitric acid production and chlorine gas preheaters.

  
  

6. Parameters

Our Advantage

1. Market Leader

Top 5 in China's nonferrous metal industry

2. Flexible products

Thousands of product specifications,Meet multiple needs of buyers

3. Low MOQ

Can customize samples

4. Short production lead time，fast delivery of whole cabinet

5. Professional inspection equipment

Before delivery, we will use spectrometers, tensile testers and other professional equipment to conduct a comprehensive inspection of the products to ensure that the goods are qualified for acceptance

6. Professional business team

Quickly responds to customer inquiries,24-hour professional quotation online

The salesperson will follow the customer's requirements for the use of the product,Professionally recommend more appropriate performance and price products to customers

7. Intact packaging

Packaging according to customer needs.You can customize wooden boxes to ensure that the goods arrive at the destination in good condition

8. Various payment methods

Facilitate customer payment

9. Get good reviews from customers

Old customers have long-term cooperation,The longest is more than 7 years

10. Received various awards

Google is very recognized by us,They give us awards every year