High Silicon Ductile Iron Rod/Bar at RT 4Si-1.5Mo nominal alloy content

High Silicon Ductile Iron Rod at RT 4Si-1.5Mo nominal alloy content Product Information -:- For detailed product information, please contact sales. -: High Silicon Ductile Iron Rod at RT 4Si-1.5Mo nominal alloy content Synonyms -:- For detailed product information, please contact sales. -:

High Silicon Ductile Iron at RT 4Si-1.5Mo nominal alloy content Product Information -:- For detailed product information, please contact sales. -: ### **Product Technical Data Sheet: High Silicon Ductile Iron – RT Series (Nominal 4% Si - 1.5% Mo Alloy)** --- #### **1. Product Overview** **High Silicon Ductile Iron (HSDI) with nominal 4% Silicon and 1.5% Molybdenum (4Si-1.5Mo)** represents the **ultimate evolution of ferritic ductile iron for extreme high-temperature service**. This premium alloy pushes the boundaries of solid-solution and precipitation strengthening, engineered for applications where **maximum creep resistance, exceptional long-term microstructural stability, and superior load-bearing capacity at temperatures exceeding 800°C (1472°F)** are non-negotiable. The synergistic effect of high silicon and elevated molybdenum creates a ferritic matrix with unparalleled high-temperature performance, positioning this material as a **high-value alternative to high-alloy austenitic cast irons and certain heat-resistant steels** in ultra-demanding thermal and mechanical environments. --- #### **2. Governing Standards & Specifications** As a cutting-edge engineering material, this alloy is defined by stringent proprietary or project-specific specifications. * **Primary References:** * **Advanced Proprietary Alloys:** Often designated under proprietary codes (e.g., **RT-4Mo1.5**) or within high-end **SiMo ductile iron families** (e.g., analogous to top-tier commercial grades like SiMo 4.5-1.5 or custom variants). * **Industry Framework:** Operates within the extended scope of alloyed ductile irons per **ISO 1083 / EN 1563**, but specific requirements are contractually defined. * **Key Performance Standards:** ASTM E8/E21 (Tensile), E139 (Creep, Creep-Rupture), E292 (Stress Rupture), G54 (Oxidation), G28 (Corrosion), with a strong emphasis on long-duration testing. --- #### **3. Typical Chemical Composition** Composition is meticulously controlled to maximize high-temperature properties while maintaining castability and structural integrity. | Element | Target Range (wt.%) | Critical Role & Rationale | | :--- | :--- | :--- | | **Carbon (C)** | **2.6 - 3.0** | **Aggressively lowered.** Critical to manage the extreme graphitizing power of high Si+Mo and prevent excessive carbon equivalent (>4.5), graphite flotation, and the formation of undesirable massive carbides. | | **Silicon (Si)** | **3.8 - 4.2 (Nominal 4.0)** | **Primary Matrix Strengthener.** Provides **intense solid-solution strengthening**, dramatically elevates the ferrite stability range (Ac1 >950°C), and ensures formation of a highly protective, adherent SiO₂-based oxide scale for **long-term oxidation resistance**. | | **Molybdenum (Mo)** | **1.4 - 1.6 (Nominal 1.5)** | **Ultimate High-Temperature Enhancer.** Provides potent **solid-solution strengthening** and promotes a high density of fine, thermally stable Mo-rich carbides (e.g., M₆C, M₂₃C₆). This **maximizes elevated-temperature tensile/yield strength, provides exceptional creep and stress-rupture resistance by impeding dislocation and grain boundary motion, and ensures outstanding microstructural stability** against phase transformation and coarsening. | | **Manganese (Mn)** | **≤ 0.10** | **Near-elimination.** Paramount to avoid the catastrophic formation of complex, brittle (Mn,Mo,Si)-rich intermetallic phases at cell boundaries, which would destroy toughness and ductility. | | **Phosphorus (P)** | **≤ 0.020** | **Ultra-trace levels.** Phosphorus embrittlement is critically severe in this alloy system; control is absolute. | | **Magnesium (Mg)** | 0.03 - 0.06 | Requires precise treatment to achieve full nodularity in the challenging, viscous high-alloy melt. | | **Cerium (Ce)/Rare Earths** | **Essential** | Critical for effective nodularization and to neutralize deleterious trace elements (Ti, Sb, Pb, Bi, etc.). | | **Nickel (Ni)** | ≤ 0.30 | Incidental only; intentionally avoided to maintain a purely ferritic matrix. | --- #### **4. Physical & Mechanical Properties** This alloy delivers top-tier performance, with properties dominated by its exceptional high-temperature capabilities. | Property | Typical Value (Room Temp) | Elevated Temperature Performance (e.g., 750-850°C / 1382-1562°F) | | :--- | :--- | :--- | | **Tensile Strength (UTS)** | **700 - 850 MPa (102 - 123 ksi)** | **Retains ~60-75% of RT UTS** at 750°C. One of the highest strength retentions among ferritic cast irons. | | **Yield Strength (0.2% YS)** | **550 - 700 MPa (80 - 102 ksi)** | **Retains ~65-80% of RT YS** at 750°C. Exceptional resistance to plastic deformation under load at extreme temperatures. | | **Elongation** | **3 - 8%** | RT ductility is limited, reflecting its design philosophy as an ultra-high-strength, creep-resistant alloy. | | **Hardness (HBW)** | 260 - 320 HBW | Very high hardness due to intense matrix strengthening. | | **Modulus of Elasticity** | ~145 - 155 GPa | Reduced due to high alloy content. | | **Creep & Stress Rupture** | **Outstanding.** The 1.5% Mo content provides **superior rupture life and the lowest minimum creep rate** in the SiMo family. Capable of **sustained operation under significant stress at 800-850°C**. | | **Oxidation Resistance** | **Superb.** Stable, slow-growing SiO₂ scale provides excellent protection in oxidizing atmospheres up to **950-1000°C (1742-1832°F)**. Mo may slightly improve scale adherence. | | **Thermal Conductivity** | **~24-28 W/m·K** | Lowest in the SiMo series due to maximum alloying, a key consideration for thermal shock design. | | **Thermal Fatigue Resistance** | **Excellent to Outstanding.** Very high strength provides resistance to crack initiation, though lower conductivity requires careful design for severe thermal transients. | | **Microstructural Stability** | **Exceptional.** The ferritic matrix with a fine dispersion of Mo-carbides exhibits remarkable resistance to grain growth, phase change, and carbide coarsening during prolonged high-temperature exposure. | --- #### **5. Product Applications** This alloy is reserved for the most critical components in advanced high-temperature systems. * **Advanced Turbocharging & Exhaust:** **Turbine housings for extreme-duty and marine engines, high-pressure exhaust manifolds for racing and performance powertrains**, where temperatures exceed 900°C. * **Industrial & Heat Treatment Furnaces:** **Radiant tubes, retorts, fan impellers, and high-stress furnace fixtures** in carburizing, carbonitriding, and brazing furnaces operating continuously at 850-1050°C. * **Power Generation (Advanced Cycles):** **Components for next-generation waste-heat recovery units, high-temperature valve bodies, and manifolds** in highly efficient combined-cycle plants. * **Chemical & Petrochemical Processing:** **Reform furnace internals, pyrolysis coil supports, and reactor components** exposed to high temperatures and carburizing/oxidizing atmospheres. * **Alternative Energy & Hydrogen:** **Components for solid-oxide fuel cell (SOFC) systems and hydrogen production/reforming equipment**. --- #### **6. Fabrication & Processing Notes** * **Melting & Casting:** Demands state-of-the-art foundry technology. High Mo significantly increases the melt's viscosity and segregation tendency. **Controlled solidification and specialized gating/risering are mandatory** to prevent shrinkage defects and undesirable carbide networks. * **Heat Treatment:** Invariably supplied in a **subcritically annealed condition** to temper any as-cast carbides and ensure a stable, fully ferritic matrix. The high Ac1 temperature precludes conventional quenching. * **Machinability:** **Extremely Difficult.** Highly abrasive and strong, causing rapid tool wear. Requires **advanced ceramic or cubic boron nitride (CBN) tooling**, very low cutting speeds, high-power machinery, and optimal cooling. * **Weldability:** **Not Weldable for Service.** Extremely prone to cold cracking and severe HAZ embrittlement. **Design for casting integrity; welding is not a viable repair or fabrication method.** --- #### **7. Ordering Information** **Specify:** **"Ultra-High Temperature Ductile Iron Castings, 4Si-1.5Mo Alloy (e.g., Proprietary Grade), Heat Treated per [Exacting Customer Specification]."** **Critical Details to Provide:** * **Exact Chemical Composition Ranges** with tight tolerances, especially for C, Si, Mo, P, Mn. * **Guaranteed Mechanical Properties** at room temperature **and** at multiple elevated temperatures relevant to the application (e.g., 700°C, 800°C, 850°C). * **Performance-Based Criteria:** Must include **creep-rupture strength requirements** (e.g., stress for 10,000/100,000 hours rupture at temperature) and **maximum allowable oxidation rate**. * **Certification Requirements:** Full pedigree with chemical analysis, comprehensive mechanical test reports (RT & HT), detailed microstructure analysis (SEM/EDS for carbide characterization may be required), and results of specified NDT (100% radiographic inspection is typical). * **Validation & Qualification:** Extended **stress-rupture testing**, **long-term oxidation testing**, and **component-specific rig testing under simulated service conditions** are standard prerequisites for part approval. **The 4Si-1.5Mo High Silicon Ductile Iron alloy is the definitive choice when conventional materials reach their thermal-mechanical limits. It embodies a masterful balance of metallurgical science and foundry art, delivering unmatched performance for the most punishing high-temperature applications on earth.** -:- For detailed product information, please contact sales. -: High Silicon Ductile Iron at RT 4Si-1.5Mo nominal alloy content Specification Dimensions Size： Diameter 20-1000 mm Length <6546 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 Silicon Ductile Iron at RT 4Si-1.5Mo nominal alloy content Properties -:- For detailed product information, please contact sales. -:

Applications of High Silicon Ductile Iron Rod at RT 4Si-1.5Mo nominal alloy content -:- For detailed product information, please contact sales. -: Chemical Identifiers High Silicon Ductile Iron Rod at RT 4Si-1.5Mo nominal alloy content -:- For detailed product information, please contact sales. -:

Packing of High Silicon Ductile Iron Rod at RT 4Si-1.5Mo nominal alloy content -:- 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 Rod 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 3017 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