EN
High Strength Forged Incoloy 800H Round Bar for Power Plant Steam Headers (20-300mm)
Engineered specifically for ultra-critical thermal environments, our high strength forged Incoloy 800H round bar delivers superior creep-rupture endurance, elevated-temperature tensile stability, and microstructural integrity under cyclic thermal-mechanical stress up to 1000°C (1832°F). Manufactured via precision VIM+ESR secondary refining and multi-directional open-die forging, these bars ensure homogeneous grain uniformity and zero internal micro-porosity for heavy-duty power plant steam headers, superheaters, and high-pressure steam distribution manifolds.
- Overview
- Key Features
- Specifications
- Applications
- Why Choose DLX
- FAQ
- Recommended Products
Product Overview
High Strength Forged Incoloy 800H Round Bar for Supercritical Steam Header Systems
Power generation boiler steam headers operate at the critical intersection of high mechanical stress, continuous steam oxidation, and extreme temperature gradients. Standard forged bars often suffer from premature grain boundary slippage and localized micro-fissuring under continuous thermal fatigue.
Our high strength forged Incoloy 800H round bar is formulated with tightly controlled carbon (0.05% - 0.10%) combined with optimized aluminum and titanium additions to form stable carbonitride precipitates. Subjected to a specialized high-temperature solution-heat treatment, the material establishes an ultra-stable coarse-to-medium grain matrix that locks grain boundaries against long-term creep deformation at operating temperatures exceeding 600°C (1112°F).
Key Features & Technical Advantages
Uncompromising Creep-Rupture Strength in High Strength Forged Incoloy 800H Round Bar
-
Superior Elevated Temperature Creep Resistance: Maintains structural rigidity and dimensional stability under sustained operating stresses above 600°C, extending the service life of steam header bodies and manifold branches.
-
Oxidation and Carburization Immunity: High chromium content (19.0% - 23.0%) combined with balanced nickel (30.0% - 35.0%) forms a self-healing, adherent protective oxide scale that resists high-temperature steam erosion, hot corrosion, and carburizing atmospheres.
-
VIM+ESR Double Refining Cleanliness: Ultra-low residual sulfur, phosphorus, and non-metallic inclusion levels yield exceptional fracture toughness and superior resistance to thermal fatigue cracking during continuous boiler start-up and shutdown cycles.
-
Strict Grain Structure & Mechanical Homogeneity: Multi-directional hydraulic forging breaks dendritic structures completely, delivering consistent radial and axial mechanical properties from surface to core across large diameters up to 300mm.
-
Excellent Machinability and Weldability: Readily weldable using matching nickel-base filler metals without post-weld embrittlement, ensuring secure fusion with boiler tubes, nozzle penetrations, and header end-caps.
Technical Specifications & Data Matrix
Chemical Composition Baseline (Weight %)
| Element | Content Range (%) | Engineering Function |
|---|---|---|
| Nickel (Ni) | 30.0 – 35.0 | Provides austenitic matrix stability & chloride stress-corrosion resistance |
| Chromium (Cr) | 19.0 – 23.0 | Delivers superior high-temperature oxidation & scaling resistance |
| Carbon (C) | 0.05 – 0.10 | Controls high-temperature creep strength via carbide precipitation |
| Aluminum + Titanium (Al+Ti) | 0.85 – 1.20 | Synergistic grain-boundary hardening & creep-rupture life enhancement |
| Iron (Fe) | Balance | Structural matrix base with optimized thermal expansion compatibility |
| Silicon (Si) | ≤ 1.00 | Cleanliness modifier |
| Manganese (Mn) | ≤ 1.50 | Hot workability enhancer |
| Sulfur (S) | ≤ 0.015 | Ultra-low limit via ESR to prevent hot shortness |
| Phosphorus (P) | ≤ 0.030 | Controlled limit for high weld integrity |
High-Temperature Mechanical & Physical Properties
| Property Parameter | Typical Value (Solution Treated) | Engineering Note |
|---|---|---|
| Tensile Strength (Room Temp) | ≥ 450 – 650 MPa | High baseline static load capability |
| Yield Strength (0.2% Offset) | ≥ 180 – 250 MPa | Excellent structural yield resistance |
| Elongation at Break (A5) | ≥ 30% | High ductility for fabrication and thermal relief |
| Density | 7.94 g/cm³ | Balanced thermal weight factor |
| Melting Point | 1357°C – 1385°C | Safe thermal headroom for extreme steam cycles |
| Thermal Expansion Coefficient | ~14.4 × 10⁻⁶ /K (20°C - 500°C) | Matched to high-temperature power piping designs |
Critical Power Generation & Heavy Industrial Applications for Incoloy 800H Forged Rods
-
Thermal & Nuclear Power Generation:
- Supercritical & Ultra-Supercritical Steam Headers: Primary steam collection manifolds, end caps, and distribution nozzles exposed to high-pressure superheated steam.
- Boiler Superheater and Reheater Connections: High-stress forged transition hubs and manifold fittings connecting heat exchanger tube banks.
-
Petrochemical & Refining Pyrolysis Units:
- Ethylene Cracking Furnace Components: Pyrolysis outlet headers, transfer line manifolds, and quench system forged fittings resisting severe carburization.
- Steam Hydrocarbon Reforming: Pigtail forged connections and catalyst tube end fittings operating under aggressive reforming gases.
-
High-Temperature Industrial Thermal Processing:
- Forged drive shafts, furnace rollers, internal structural supports, and heavy-duty load-bearing fixtures operating continuously above 800°C.
Why Choose DLX
Integrated Metallurgy & Large-Scale Manufacturing Reliability
- Complete In-House Metallurgy Chain: From pure raw material batching, vacuum induction melting (VIM), electro-slag remelting (ESR), to open-die forging, rough machining, and specialized solution heat treatment—every step is strictly monitored under our digital quality trace system.
- Robust Monthly Capacity: With an integrated production output of 1,200 tons/month, DLX guarantees steady, uninterrupted supply chains for large-scale energy projects and global engineering contractors.
-
Rigorous In-House Quality Assurance:
- 100% full-length digital ultrasonic flaw detection to ensure zero internal shrinkage, pipe, or crack defects.
- Optical emission spectroscopy (OES) chemical analysis per melt heat.
- Room and elevated-temperature tensile testing, metallographic grain size validation, and certified 3.1 inspection reporting.
- Engineered Project Customization: Tailored diameter profiles from Dia 20mm up to 300mm with flexible lengths, tight dimensional tolerance controls, custom beveling, and protective export crating.
Frequently Asked Questions
Q1: What makes Incoloy 800H better than Grade 800 for steam headers?
A: Incoloy 800H features a tightly controlled carbon content (0.05%–0.10%) and specialized high-temperature solution annealing. This stabilizes a coarse-grain structure that delivers significantly higher creep-rupture strength and thermal fatigue resistance above 600°C.
Q2: How is internal soundness ensured in large forged bars up to 300mm?
A: We use Electro-Slag Remelting (ESR) and multi-directional hydraulic forging (≥4:1 reduction ratio). Every bar undergoes 100% volumetric Ultrasonic Testing (UT) and Dye Penetrant Inspection (PT) to guarantee zero internal voids or cracks.
Q3: What surface finishes and tolerances are available?
A: Bars are supplied in rough turned, peeled, or centerless ground finishes across Dia 20mm–300mm, with precision tolerances (up to h9/h11) and straightness within 1.0mm/m for direct CNC machining.
Q4: How does Incoloy 800H resist steam oxidation and carburization?
A: With 19%–23% Cr and 30%–35% Ni, the alloy develops a dense, self-healing chromia oxide layer that prevents scaling, high-temperature steam erosion, and chloride stress corrosion.
Q5: What are the packaging options and delivery lead times?
A: Bars are anti-rust coated, heat-number stamped, and packed in reinforced export wooden crates or steel bundles. Standard sizes ship in 7–10 days; custom project orders ship in 3–4 weeks backed by our 1,200 tons/month capacity.
