High Strength Incoloy 800 Alloy Bar for Industrial Furnaces and High Temperature Equipment

‌1. Product Information‌

‌Product Name‌: Incoloy 800 Bar (Standard Grade)
‌Material Type‌: Nickel-Iron-Chromium Superalloy (Austenitic Structure)
‌Standards‌: ASTM B408, AMS 5766, UNS N08800, DIN 1.4876
‌Forms Available‌: Hot-rolled bars, cold-finished bars, and forged bars.
‌Diameter Range‌: 5 mm to 150 mm (custom sizes up to 300 mm on request).
‌Surface Finish‌: Black oxide, turned, ground, or polished (Ra ≤ 0.8 μm).
Operating Temperature‌:

• Continuous service: Up to 815°C (1500°F)

• Short-term exposure: Up to 980°C (1800°F)

Certifications‌: ASME SB408, PED 2014/68/EU, and NACE MR-0175 for mild sour service.

‌2. Characteristics‌

Incoloy 800 bar is engineered for high-temperature industrial processes requiring oxidation resistance and structural stability:

• ‌Oxidation Resistance‌: Forms a protective Cr₂O₃-rich oxide layer, reducing scaling rates by 40% compared to 310S stainless steel at 800°C.

• ‌Carburization Resistance‌: Stable in hydrocarbon-rich environments (e.g., ethylene crackers) with carbon activity <0.5 after 10,000 hours at 700°C.

• ‌Thermal Fatigue Resistance‌: Low thermal expansion coefficient (14.8 μm/m·°C at 20–600°C) minimizes stress during thermal cycling.

• ‌Mechanical Strength‌: Retains 200 MPa yield strength at 700°C, outperforming Alloy 600 in creep-limited applications.

• ‌Fabrication Flexibility‌: Excellent weldability (autogenous TIG welding possible) and machinability (70% rating vs. 316L stainless steel).

‌3. Technology‌

‌Manufacturing Process‌:

• ‌Electric Arc Furnace (EAF) + AOD Refining‌: Controls carbon to ≤0.08% and sulfur to ≤0.015%.

• ‌Hot Rolling‌: Processed at 1150–1200°C to refine grain structure (ASTM 3-5).

• ‌Heat Treatment‌:

• Solution annealing at 1010–1060°C (1850–1940°F) followed by water quenching.

• Stress-relief annealing at 870°C (1600°F) for cold-worked bars.
  ‌Quality Control‌:

• Ultrasonic testing (UT) per ASTM A388 for internal defects.

• High-temperature tensile testing per ASTM E21.

• Eddy current testing for surface cracks (sensitivity ≤0.1 mm depth).

‌4. Theory‌

The alloy’s performance is governed by its balanced metallurgical design:

• ‌Nickel-Chromium Synergy‌: High Ni content stabilizes the austenitic matrix, while Cr provides oxidation resistance via protective oxide formation.

• ‌Carbon Control‌: Low carbon minimizes chromium carbide precipitation at grain boundaries, preserving ductility.

• ‌Aluminum-Titanium Interaction‌: Al and Ti combine with residual carbon to form fine (Ti,Al)(C,N) precipitates, enhancing creep resistance.

• ‌Grain Boundary Strengthening‌: Controlled hot-rolling parameters produce equiaxed grains with minimal delta-ferrite, reducing crack propagation risks.

‌5. Application‌

Incoloy 800 bars are widely used in extreme thermal environments:

• ‌Petrochemical‌:

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

• Support beams for hydrocracker reactors (operating at 750°C/50 bar).

• ‌Power Generation‌:

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

• ‌Heat Treatment‌:

• Fixtures for annealing furnaces, carburizing trays, and sintering boat components.

• ‌Chemical Processing‌:

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

  
  

6. Parameters

Our Advantage

1. Market Leader

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2. Flexible products

Thousands of product specifications,Meet multiple needs of buyers

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Can customize samples

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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

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