High-Nickel Gray Iron Tube,Pipe, corrosion resistant

High-Nickel Gray Iron Tube, corrosion resistant Product Information -:- For detailed product information, please contact sales. -: High-Nickel Gray Iron Tube, corrosion resistant Synonyms -:- For detailed product information, please contact sales. -:

High-Nickel Gray Iron, corrosion resistant Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: High-Nickel Gray Iron, Corrosion Resistant (Ni-Resist)** High-Nickel Gray Iron, commonly known as **Ni-Resist**, is a family of austenitic cast irons specifically engineered for superior corrosion resistance and performance in extreme environments. By incorporating significant amounts of nickel (and often chromium and copper), these alloys develop a stable austenitic matrix, effectively resisting graphitic corrosion, growth, and scaling at elevated temperatures, while providing excellent resistance to a wide range of corrosive media, including acids, alkalis, and saline solutions. This material uniquely combines the casting ease and machinability of gray iron with the durability typically associated with high-alloy materials, making it a cost-effective solution for demanding applications. --- ### **1. Chemical Composition** The corrosion resistance is primarily achieved through a carefully balanced chemistry. A typical specification for the most common corrosion-resistant grade is outlined below, along with key alloying elements' roles. **Typical Composition (Grade D-2S / ASTM A436 Type 1b):** | Element | Content (%) | Primary Function | | :--- | :--- | :--- | | **Nickel (Ni)** | 18.0 - 22.0 | Stabilizes the austenitic matrix, provides fundamental corrosion resistance, improves toughness. | | **Chromium (Cr)** | 2.0 - 3.0 | Enhances resistance to oxidation, scaling, and pitting corrosion; strengthens the matrix. | | **Copper (Cu)** | 0.5 - 1.5 | Improves corrosion resistance in sulfuric acid and seawater; aids in matrix stabilization. | | **Silicon (Si)** | 1.0 - 2.0 | Promotes graphitization, improves castability, and enhances oxidation resistance. | | **Carbon (C)** | 3.0 - 3.5 | Ensures graphite formation for machinability, damping, and thermal conductivity. | | **Manganese (Mn)** | 0.5 - 1.5 | Counteracts sulfur, aids in deoxidation. | | **Phosphorus (P)** | ≤ 0.08 | Low level to maintain toughness and corrosion resistance. | | **Sulfur (S)** | ≤ 0.12 | Controlled to prevent embrittlement. | | **Iron (Fe)** | Balance | Base metal. | *Note: Various grades exist with compositional adjustments to target specific corrosion types (e.g., high-silicon versions for severe acid service).* --- ### **2. Physical & Mechanical Properties** Ni-Resist exhibits a distinct set of properties derived from its austenitic structure. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure** | Austenitic matrix with flake graphite (Type A distribution is preferred). | | **Density** | ~7.1 g/cm³ (Slightly lower than plain gray iron). | | **Tensile Strength** | 170 - 240 MPa (24 - 35 ksi) | | **Yield Strength (0.2% Offset)** | 140 - 190 MPa (20 - 28 ksi) | | **Elongation** | 1 - 2% (Limited, but higher than standard gray iron) | | **Hardness** | 140 - 250 HB | | **Thermal Expansion** | High (~18 x 10⁻⁶/°C), similar to austenitic stainless steel. | | **Magnetic Properties** | Essentially non-magnetic (austenitic). | | **Machinability** | Good to excellent (similar to or better than standard gray iron). | | **Damping Capacity** | Excellent, inheriting the good damping characteristics of gray iron. | --- ### **3. Key Product Advantages & Characteristics** * **Superior Corrosion Resistance:** Outstanding resistance to seawater, alkaline solutions, dilute sulfuric, acetic, and phosphoric acids, and many organic compounds. Highly resistant to **graphitization** (selective leaching of iron), a common failure mode for plain cast iron in wet environments. * **Heat & Oxidation Resistance:** Performs well in intermittent service up to ~800°C (1470°F), resisting scaling and growth. * **Non-Magnetic:** Ideal for applications requiring minimal magnetic permeability. * **Dimensional Stability:** Maintains size and shape under thermal cycling due to the stable austenitic structure. * **Casting Performance:** Excellent fluidity and castability, allowing for the production of complex, thin-walled components. --- ### **4. Product Applications** Ni-Resist is specified across industries where corrosion is a primary concern: * **Marine & Offshore:** Pump bodies, valve casings, seawater piping, fittings, stern tubes, desalination components. * **Chemical Processing:** Mixing tanks, reactor parts, acid pumps, valve bodies, pipe fittings, and equipment handling corrosive chemicals. * **Power Generation:** FGD (Flue Gas Desulfurization) system components, scrubber parts, condenser covers. * **Food & Pharmaceutical:** Equipment requiring frequent cleaning with aggressive sanitizers (e.g., caustic solutions). * **Automotive & Transportation:** Turbocharger housings, exhaust manifolds (for certain diesel engines), brake components in corrosive environments. * **General Engineering:** Any application where standard cast iron fails due to corrosion or oxidation. --- ### **5. International Standards** High-Nickel Gray Irons are covered by well-established international standards, ensuring consistent quality and performance. The most common standards include: | Standard | Title / Scope | Common Grades | | :--- | :--- | :--- | | **ASTM A436** | *Standard Specification for Austenitic Gray Iron Castings* | **Type 1, Type 1b (D-2S), Type 2, etc.** This is the primary ASTM standard. | | **ISO 2892** | *Austenitic cast irons* | **JLW/CR/A2Ni20Cr2** (similar to ASTM Type 1b). Provides a global designation system. | | **EN 13835** | *Founding - Austenitic cast irons* (European Standard) | **EN-GJLA-XNiCuCr15-6-2** (Example designation). Replaces older national standards like BS 3468. | | **DIN EN 13835** | German adoption of EN 13835. | Same as EN 13835. | | **JIS G5510** | *Austenitic cast irons* (Japanese Standard) | **FCA-Ni20Cr2** | **Note:** When specifying material, it is crucial to indicate both the standard and the grade (e.g., ASTM A436, Type 1b) to ensure the correct chemistry and properties are supplied. --- ### **Conclusion** High-Nickel Gray Iron (Ni-Resist) is a versatile and proven engineering material that bridges the gap between standard cast iron and high-nickel alloys. Its optimal blend of **castability, machinability, mechanical strength, and exceptional corrosion/heat resistance** makes it a first-choice material for designers and engineers tackling durability challenges in harsh operating conditions. When sourced to established international standards like ASTM A436 or ISO 2892, it provides a reliable and cost-effective solution for long-term performance. -:- For detailed product information, please contact sales. -: High-Nickel Gray Iron, corrosion resistant Specification Dimensions Size： Diameter 20-1000 mm Length <6479 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 Gray Iron, corrosion resistant Properties -:- For detailed product information, please contact sales. -:

Applications of High-Nickel Gray Iron Tube, corrosion resistant -:- For detailed product information, please contact sales. -: Chemical Identifiers High-Nickel Gray Iron Tube, corrosion resistant -:- For detailed product information, please contact sales. -:

Packing of High-Nickel Gray Iron Tube, corrosion resistant -:- 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 2950 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