21Cr-32Ni-Ti-Al Iron Sheet,Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P)

21Cr-32Ni-Ti-Al Iron Sheet/Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) Product Information -:- For detailed product information, please contact sales. -: 21Cr-32Ni-Ti-Al Iron Sheet/Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) Synonyms -:- For detailed product information, please contact sales. -:

21Cr-32Ni-Ti-Al IRON BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: NCF 800H-P (UNS N08810) Iron-Based Superalloy Plate for High-Temperature Structural Applications** --- ### **1. Overview** **21Cr-32Ni-Ti-Al Alloy Plate (NCF 800H-P)** is a premium-grade **iron-nickel-chromium superalloy plate** specifically engineered for demanding structural applications requiring exceptional **high-temperature strength, oxidation resistance, and corrosion stability**. As the plate product form of the renowned Alloy 800H, this material delivers superior **creep and rupture strength** in the **550°C to 900°C (1022°F to 1652°F)** range, combined with excellent resistance to carburization, nitriding, and sulfidizing atmospheres. The "H" designation signifies the controlled higher carbon content (0.05-0.10%) and mandatory solution annealing to achieve an optimized coarse-grain microstructure essential for long-term load-bearing capability at elevated temperatures. The "-P" suffix specifically denotes its qualification as **plate material** for pressure vessel and structural fabrication. --- ### **2. International Standards** This alloy plate is governed by comprehensive international specifications for pressure vessel and structural applications. * **Primary Plate Standards:** * **ASTM B409 / ASME SB-409:** *Standard Specification for Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip.* This is the principal specification for plate products (UNS N08810/N08811). * **JIS H4551 NCF 800H-P:** Japanese Industrial Standard for Nickel-Chromium-Iron Alloy Plates for Pressure Vessels. * **DIN 17742 NiCr21Fe (1.4876):** German material number for wrought forms. * **EN 10095 X8NiCrAlTi32-21 (1.4958):** European standard for heat-resisting steel and alloy products. * **Material Designations & Key Equivalents:** * **UNS N08810:** Unified Numbering System designation for the high-carbon, creep-optimized grade (**Alloy 800H**). * **UNS N08811:** Variant with enhanced aluminum + titanium control for nuclear applications. * **Alloy 800H / 800HT:** Common trade names. **800HT** (UNS N08811) typically requires Al+Ti ≥ 0.85% for improved strength. * **ASME Code Case:** Approved for use under ASME Boiler & Pressure Vessel Code, Section I, Section VIII, Div. 1 & 2, with maximum allowable stresses published up to **815°C (1500°F)**. --- ### **3. Chemical Composition (Weight %, per ASTM B409 for UNS N08810)** The precise alloy balance ensures stability under thermal and mechanical stress. | Element | Composition (%) (Specification) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | 30.0 – 35.0 | **Primary austenite stabilizer.** Provides fundamental corrosion and carburization resistance, and ensures microstructural stability. | | **Chromium (Cr)** | 19.0 – 23.0 | **Primary protector.** Confers **exceptional oxidation and sulfidation resistance** by forming a durable Cr₂O₃ surface layer. | | **Iron (Fe)** | Balance (~39.5 – 45.5) | Base element of the alloy matrix. | | **Carbon (C)** | 0.05 – 0.10 | **Critical for creep strength.** Promotes coarse grain growth during solution annealing and forms stable carbides that strengthen grain boundaries under long-term stress. | | **Aluminum (Al)** | 0.15 – 0.60 | Combines with Titanium to form fine **gamma-prime [γ'-Ni₃(Al,Ti)] precipitates** during service, providing precipitation strengthening at high temperatures. | | **Titanium (Ti)** | 0.15 – 0.60 | Synergizes with Al for γ' formation; also getters carbon to form stable TiC, preventing deleterious chromium carbide formation at grain boundaries. | | **Manganese (Mn)** | ≤ 1.50 | Improves hot workability and binds sulfur. | | **Silicon (Si)** | ≤ 1.00 | Enhances oxidation resistance, especially in carburizing environments. | | **Copper (Cu)** | ≤ 0.75 | Residual element; can influence specific corrosion properties. | | **Sulfur (S)** | ≤ 0.015 | Impurity, minimized to ensure good hot workability and weldability. | --- ### **4. Typical Physical & Mechanical Properties (Plate, Solution Annealed Condition)** * **Solution Annealing:** Plates are solution annealed at **1120°C - 1170°C (2050°F - 2140°F)** followed by rapid cooling (water quenching or equivalent) to dissolve carbides and achieve the ASTM grain size of **ASTM No. 5 or coarser**, which is mandatory for optimal creep performance. * **Tensile Strength (Room Temp):** ≥ 450 MPa (65,000 psi) * **Yield Strength (0.2% Offset, RT):** ≥ 170 MPa (25,000 psi) * **Elongation (% in 50mm/2in):** ≥ 30% * **Density:** 7.94 g/cm³ (0.287 lb/in³) * **Melting Range:** ~ 1350 – 1400 °C (2460 – 2550 °F) * **Modulus of Elasticity:** 200 GPa (29 x 10⁶ psi) at 21°C * **Thermal Conductivity:** ~ 11.5 W/m·K at 100°C * **Coefficient of Thermal Expansion:** 14.5 x 10⁻⁶ /K (20-100°C) – *Higher than ferritic steels; requires careful design for thermal cycling.* * **Key High-Temperature Performance:** * **Oxidation Resistance:** Excellent up to **~1100°C (2012°F)** in cyclic oxidizing atmospheres. * **Carburization/Nitriding Resistance:** Outstanding due to high nickel content; resistant to carbon and nitrogen penetration in process gases. * **Creep & Stress-Rupture Strength:** Exceptional long-term load-bearing capability at temperatures above 600°C, the primary reason for selecting 800H over standard austenitic stainless steels. --- ### **5. Product Application** NCF 800H-P plate is utilized in fabricating critical high-temperature pressure components and structural supports. * **Petrochemical & Chemical Processing:** * **Reformer Furnace Components:** Outlet headers, pigtail supports, manifold plates, and radiant section liners in steam methane reformers (SMR). * **Ethylene Cracker Components:** Liners, baffles, and internal components of pyrolysis furnaces. * **High-Temperature Reactor Vessels and Internals** for processes involving hydrogen, ammonia, and methanol synthesis. * **Power Generation:** * **Heat Recovery Steam Generator (HRSG) Components** in the highest temperature sections. * **Advanced Nuclear Reactor Core Support Structures and Hot Ducting** (using N08811 grade). * **Industrial Furnace Engineering:** * **Retorts, Muffles, and radiant tubes.** * **Roller hearth and car bottom furnace components.** * **Aerospace:** Certain high-temperature structural supports and engine test facility components. --- ### **6. Key Features & Advantages** * **Optimized Creep Resistance:** The controlled high carbon content and mandatory coarse grain structure deliver unparalleled long-term stress rupture life for an Fe-Ni-Cr alloy. * **Superior Environmental Resistance:** Exceptional stability in complex, aggressive atmospheres containing oxidizing, carburizing, and sulfidizing species. * **Excellent Fabricability:** Can be welded using matching or overalloyed filler metals (e.g., Inconel 625/82/182 weld metal) with proper procedures. It can be cold formed and machined, though its work hardening rate is significant. * **Metallurgical Stability:** Resists formation of harmful intermetallic phases (like sigma) during long-term exposure within its recommended temperature range. * **Code Compliance:** Fully recognized in ASME, PED (European Pressure Equipment Directive), and other major international codes, with extensive published design data. --- **In summary, the 21Cr-32Ni-Ti-Al alloy plate (NCF 800H-P / Alloy 800H) is a high-performance superalloy plate engineered for the most demanding high-temperature structural applications. Its combination of extreme creep strength, outstanding corrosion resistance, and code-approved design allow enables the safe and reliable construction of critical components in reforming, cracking, and power generation industries, where equipment must withstand decades of operation under severe thermal and mechanical stress.** -:- For detailed product information, please contact sales. -: 21Cr-32Ni-Ti-Al IRON BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) Specification Dimensions Size： Diameter 20-1000 mm Length <7018 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: 21Cr-32Ni-Ti-Al IRON BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) Properties -:- For detailed product information, please contact sales. -:

Applications of 21Cr-32Ni-Ti-Al Iron Sheet,Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) -:- For detailed product information, please contact sales. -: Chemical Identifiers 21Cr-32Ni-Ti-Al Iron Sheet,Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) -:- For detailed product information, please contact sales. -:

Packing of 21Cr-32Ni-Ti-Al Iron Sheet/Plate BASED 21Cr-32Ni-Ti-Al SUPERALLOY FOR CORROSION AND HEAT-RESISTING PLATE (NCF 800H-P) -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Sheet/Plate drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3489 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition