High-Nickel Ductile Iron Tube,Pipe, heat-resistant ductile Iron Tube,Pipe, 23% Ni

High-Nickel Ductile Iron Tube, heat-resistant ductile Iron Tube, 23% Ni Product Information -:- For detailed product information, please contact sales. -: High-Nickel Ductile Iron Tube, heat-resistant ductile Iron Tube, 23% Ni Synonyms -:- For detailed product information, please contact sales. -:

High-Nickel Ductile Iron, heat-resistant ductile iron, 23% Ni Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: High-Nickel (23% Ni) Heat-Resistant Ductile Iron** High-Nickel (23% Ni) Heat-Resistant Ductile Iron represents an optimized austenitic nodular iron specifically engineered to bridge the performance gap between standard 20% Ni grades and higher-alloy super austenitic materials. With a nominal nickel content of 23%, this alloy delivers enhanced high-temperature stability, superior thermal fatigue resistance, and improved corrosion resistance, particularly in sulfur-bearing and cyclic oxidizing environments. It is designed for demanding service in the **750°C to 900°C (1380°F to 1650°F)** range, where components must withstand significant thermal stress, dimensional constraints, and environmental degradation simultaneously. This material is particularly valued for its balance of performance and cost, offering a robust solution for applications where 20% Ni grades may approach their limits and where 30%+ Ni grades would be economically prohibitive. --- ### **1. Chemical Composition (Nominal 23% Ni Grade)** This alloy refines the balance of austenite stabilizers and oxidation resistance elements for superior performance. **Typical Composition Range (Proprietary/Enhanced Grade):** | Element | Content (%) | Primary Function in Heat Resistance | | :--- | :--- | :--- | | **Nickel (Ni)** | **22.0 - 24.0** | **Enhanced Austenite Stabilizer.** The increased Ni content further stabilizes the austenitic matrix, raising the temperature at which harmful secondary phases may form. This provides even greater resistance to thermal growth, distortion, and embrittlement after prolonged exposure compared to 20% Ni grades. | | **Chromium (Cr)** | **2.0 - 3.0** | **Key Oxidation & Corrosion Resistor.** Forms a more continuous and protective Cr₂O₃-rich scale. The slightly elevated Cr content improves resistance to oxidation, sulfidation (hot corrosion), and carburization, extending component life in aggressive flue gases and combustion atmospheres. | | **Silicon (Si)** | **1.8 - 3.0** | **Synergistic Scale Former & Stabilizer.** Promotes a dense, adherent SiO₂-Cr₂O₃ complex scale. The often-higher Si range (compared to some 20% Ni specs) significantly improves scaling resistance and stabilizes the matrix against growth. | | **Carbon (C)** | **2.0 - 2.6** | Carefully controlled to ensure nodularity while minimizing the formation of chromium carbides, which could deplete Cr from the matrix and reduce corrosion resistance. | | **Manganese (Mn)** | 0.8 - 1.8 | Supports austenite stability. May be slightly higher to improve hot workability and sulfide inclusion control. | | **Molybdenum (Mo)** | **0 - 1.0 (Optional)** | Sometimes added in small amounts to improve high-temperature strength and creep resistance without significantly impacting oxidation behavior. | | **Copper (Cu)** | ≤ 1.0 (Optional) | May be present to enhance atmospheric corrosion resistance. | | **Magnesium (Mg)** | 0.04 - 0.07 | Nodularizing element. | | **Iron (Fe)** | Balance | Base metal. | **Microstructural Note:** The target is a **fully austenitic matrix** with a uniform dispersion of **fine, well-nodularized graphite (Type VI)**. The structure should be free of continuous carbide networks and deleterious intermetallic phases (e.g., sigma phase), which can form with improper Cr/Ni balance. --- ### **2. Physical & Mechanical Properties at Room & Elevated Temperature** This grade offers enhanced property retention at the upper end of its service temperature range. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | Austenitic matrix with spheroidal graphite. | | **Density** | ~7.3 - 7.4 g/cm³ | | **Tensile Strength (Room Temp)** | **470 - 580 MPa (68 - 84 ksi)** | | **Yield Strength (0.2% Offset, Room Temp)** | **250 - 330 MPa (36 - 48 ksi)** | | **Elongation (Room Temp)** | **10 - 25%** – Excellent ductility is maintained. | | **Hardness (Room Temp)** | **150 - 210 HB** | | **Impact Resistance** | **25 - 40 J (18 - 30 ft-lbf)** at room temperature. | | **Maximum Service Temperature** | **Up to 900°C (1650°F)** in oxidizing service. Excellent for long-term cyclic service up to **850°C (1560°F)**. | | **Growth Resistance** | **Exceptional.** Growth is typically ≤ 0.03% after 1000 hours at 800°C, superior to 20% Ni grades. | | **Oxidation & Sulfidation Resistance** | **Very Good to Excellent.** The optimized Cr and Si levels provide better protection against scaling and hot corrosion from sulfur compounds than standard 20% Ni grades. | | **Thermal Conductivity** | Moderate (~13-16 W/m·K). | | **Thermal Shock & Fatigue Resistance** | **Outstanding.** The combination of high ductility, stable austenite, and nodular graphite yields exceptional resistance to crack initiation and propagation under severe thermal cycling. | | **Creep Strength** | Good. Adequate for many structural applications; optional Mo addition can improve this further. | | **Magnetic Properties** | **Fully non-magnetic.** | --- ### **3. Key Product Advantages & Characteristics** * **Enhanced High-Temperature Capability:** Pushes the continuous service temperature ceiling higher than standard D-2 type alloys, offering a safety margin in demanding applications. * **Superior Environmental Resistance:** Better equipped to handle complex atmospheres containing sulfur, chlorine, or cyclic oxidizing/reducing conditions. * **Excellent Long-Term Microstructural Stability:** Reduced risk of embrittlement from secondary phase precipitation during prolonged high-temperature exposure. * **Optimal Balance of Strength and Ductility:** Maintains high toughness and damage tolerance across a wide temperature range. * **Proven Thermal Fatigue Performance:** The premier choice for the most severe thermal cycling applications within the ductile iron family. --- ### **4. Product Applications** This material is specified for the most demanding roles within its temperature class, often in critical power and processing infrastructure. * **High-Performance Turbochargers:** Housings for large marine, industrial, and next-generation automotive turbochargers where exhaust gas temperatures and sulfur content are high. * **Exhaust Manifolds & Components:** For high-output, thermally stressed engines in power generation, marine, and heavy-duty vehicles. * **Waste-to-Energy & Biomass Plants:** Critical components such as grate elements, ash handling parts, and fan housings exposed to high temperatures, thermal cycling, and corrosive flue gases. * **Chemical & Petrochemical Processing:** Tube hangers, support fixtures, and valve components in reforming and cracking furnaces. * **Heat Treatment Industry:** High-quality fixtures, trays, and radiant tube supports for high-temperature carburizing and sintering furnaces. --- ### **5. International Standards** While 23% Ni is often a proprietary optimization, it falls under and extends the scope of established austenitic ductile iron standards. | Standard | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **ASTM A439** | *Standard Specification for Austenitic Ductile Iron Castings* | Often supplied as a enhanced version of **Type D-2** or under a proprietary designation meeting the mechanical property requirements of Type D-2 but with a specified Ni range of 22-24%. | | **ISO 2892** | *Austenitic cast irons* | Can be specified under the ISO system as a custom grade, e.g., **JS/HR/ANi23Cr2.5** (Spheroidal Graphite / Heat Resistant / Austenitic with 23% Ni, 2.5% Cr). | | **EN 13835** | *Founding – Austenitic cast irons* (European) | Can be represented as **EN-GJSA-XNiCr23-3** or similar within the flexible material number system, allowing for precise composition calls. | | **Proprietary Specifications** | Manufacturer & End-User Specifications | Very common. Grades like **Ni-Resist D-2S (HT)** or **Enhanced D-2** are often defined by bilateral agreements between foundries and OEMs (e.g., in turbocharger or manifold specifications) with strict 23% Ni chemistry. | | **JIS G5513** | *Austenitic spheroidal graphite iron castings* | While standard grades are listed, manufacturers often produce optimized versions meeting customer-specific 23% Ni requirements. | **Specification Note:** Procurement is typically governed by **detailed technical data sheets or proprietary material specifications** from OEMs. These documents specify the exact chemical ranges (centered on 23% Ni), mandatory room and high-temperature mechanical tests, and often include performance validation such as **thermal cycle testing** or **oxidation weight gain tests** at a target temperature (e.g., 850°C). --- ### **Conclusion** High-Nickel (23% Ni) Heat-Resistant Ductile Iron is a performance-optimized material that refines the proven austenitic ductile iron concept for the most challenging operational frontiers. Its **strategically elevated nickel and balanced chromium-silicon chemistry** delivers a critical enhancement in **long-term microstructural stability, maximum service temperature, and environmental resistance** compared to standard 20% Ni grades. As a result, it has become the **go-to engineered solution for critical components in advanced turbocharging, high-efficiency power generation, and severe waste-processing applications**, where incremental performance gains translate into significant improvements in reliability, efficiency, and service life. It exemplifies the application-driven evolution of alloyed ductile iron technology. -:- For detailed product information, please contact sales. -: High-Nickel Ductile Iron, heat-resistant ductile iron, 23% Ni Specification Dimensions Size： Diameter 20-1000 mm Length <6488 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. -: High-Nickel Ductile Iron, heat-resistant ductile iron, 23% Ni Properties -:- For detailed product information, please contact sales. -:

Applications of High-Nickel Ductile Iron Tube, heat-resistant ductile Iron Tube, 23% Ni -:- For detailed product information, please contact sales. -: Chemical Identifiers High-Nickel Ductile Iron Tube, heat-resistant ductile Iron Tube, 23% Ni -:- For detailed product information, please contact sales. -:

Packing of High-Nickel Ductile Iron Tube, heat-resistant ductile Iron Tube, 23% Ni -:- 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 Tube 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 2959 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