Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube,Pipe

Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube Product Information -:- For detailed product information, please contact sales. -: Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube Synonyms -:- For detailed product information, please contact sales. -:

Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron** Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron is a premier abrasion-resistant alloy engineered to deliver maximum wear resistance in severe grinding and gouging environments. As a high-carbon ("HC") variant within the ASTM A532 15% chromium-molybdenum family, this material prioritizes peak hardness and volumetric abrasion resistance above all else. The elevated carbon content drives the formation of a high volume fraction of hard, interconnected chromium carbides within a strong martensitic matrix, creating a microstructure optimized to withstand extreme mechanical wear. It is designed for applications where abrasive wear is the dominant failure mechanism and impact forces, while present, are less severe than those experienced by lower-carbon grades. This grade represents the pinnacle of pure abrasion resistance within the widely-used 15% Cr white iron class, offering extended service life in high-wear, moderate-impact applications. --- ### **1. Chemical Composition** The composition is defined by high carbon content paired with sufficient chromium to form carbides and molybdenum to ensure martensitic hardenability. **Typical Composition Range (ASTM A532 Class II Type C):** | Element | Content (%) | Primary Function | | :--- | :--- | :--- | | **Chromium (Cr)** | **14.0 - 18.0** | **Primary carbide former and corrosion resistor.** Combines with carbon to form a high volume of hard (Cr,Fe)₇C₃ carbides. Provides inherent resistance to oxidation and corrosion, protecting both the matrix and carbide interfaces. | | **Molybdenum (Mo)** | **2.3 - 3.5** | **Essential hardenability agent.** Crucial for suppressing pearlite formation during cooling, enabling the transformation of the austenitic matrix to martensite upon heat treatment, even in thick casting sections. | | **Carbon (C)** | **3.2 - 3.6** | **High Carbon ("HC") carbide former.** This is the defining characteristic. High carbon ensures a maximum volume fraction of hard, primary and eutectic chromium carbides, directly translating to superior abrasion resistance. | | **Manganese (Mn)** | 0.5 - 1.5 | Supports hardenability and acts as a deoxidizer. | | **Silicon (Si)** | 0.5 - 1.2 | Deoxidizer; kept low to prevent graphite formation which would compromise wear resistance. | | **Nickel (Ni)** | **0 - 2.5** (Optional) | May be added to further enhance hardenability, particularly in complex or heavy-section castings, and to provide a marginal toughness improvement. | | **Copper (Cu)** | 0 - 1.2 (Optional) | Occasionally used for supplementary hardenability. | | **Iron (Fe)** | Balance | Base metal. | **Microstructural Note:** The as-cast structure consists of austenite and a dense network of eutectic M₇C₃ carbides. Following a standard destabilization heat treatment (typically 950-1050°C followed by air or fan cooling), the microstructure transforms into a **hard martensitic matrix** with a **high volume fraction (typically 30-40%) of interconnected or blocky (Cr,Fe)₇C₃ carbides**. The carbides form a continuous or semi-continuous skeleton that provides the primary wear resistance. --- ### **2. Physical & Mechanical Properties** Properties are dominated by the hard, brittle carbide phase, offering exceptional wear resistance at the expense of toughness. | Property | Typical Value / Description | | :--- | :--- | | **Microstructure (Heat-Treated)** | **Martensitic matrix with a high volume of interconnected M₇C₃ carbides.** | | **Density** | ~7.6 - 7.7 g/cm³ | | **Macrohardness** | **650 - 750+ HB** (62 - 68 HRC) – Among the highest achievable hardness levels for commercial cast abrasion-resistant alloys. | | **Compressive Strength** | **Extremely High** – Excellent for withstanding heavy crushing and grinding pressures. | | **Tensile Strength** | Low (300 - 500 MPa) – Not a design parameter. | | **Elongation** | **Negligible (< 0.2%)** – Highly brittle material. | | **Fracture Toughness (K_IC)** | **Low (~8-15 MPa√m).** The high carbide volume and interconnected network create numerous stress concentrators, making the material susceptible to crack propagation under impact. | | **Impact Resistance (Charpy Unnotched)** | **5 - 15 J** – Low impact resistance; requires careful design and installation to avoid stress concentrations and direct heavy shock. | | **Abrasion Resistance** | **Exceptional.** Provides outstanding resistance to high-stress grinding abrasion (gouging and grinding) where the abrasive medium is of equal or lower hardness than the carbides (e.g., silica, taconite). It is a benchmark material for pure abrasive wear. | | **Corrosion & Oxidation Resistance** | **Very Good.** The high chromium content provides excellent protection against rust and scaling, beneficial in wet or semi-corrosive environments. | | **Elevated Temperature Stability** | **Good.** Maintains hardness at moderate temperatures (up to ~500°C) better than low-alloy steels. | | **Machinability** | **Extremely Poor.** Can only be finished by grinding. Cast to net or near-net shape is essential. | --- ### **3. Key Product Advantages & Characteristics** * **Maximum Abrasion Resistance:** Delivers the highest level of wear protection available in standardized 15% Cr white irons, ideal for gradual wear applications. * **Excellent Compressive Strength:** Withstands extreme pressures without deformation, suitable for grinding and crushing roles. * **Good Environmental Resistance:** Performs well in damp, corrosive, or moderately hot environments where lower-alloy materials would degrade faster. * **Predictable Wear Life:** Offers consistent and extended service life in controlled, high-abrasion conditions. --- ### **4. Product Applications** This material is specified for high-wear, low-to-moderate impact components where wear life is the paramount concern. * **Mining & Mineral Processing:** **Grinding mill liners** (especially in ball and SAG mills), **slurry pump volutes and impellers** for highly abrasive slurries, **hydrocyclone liners**, classifier shoes. * **Cement Industry:** **Finish mill liners**, **high-pressure grinding roll (HPGR) studs**, vertical mill grinding tables and rollers, clinker crusher wear plates. * **Power Generation:** **Coal pulverizer grinding rolls and tires**, fan blades in abrasive flue gas paths, ash conveyor components. * **Dredging & Sand Processing:** Pump casing liners, suction pipe elbows, and wear plates handling pure sand and gravel slurries. * **Shot Blasting:** Machine liners and impellers where direct, high-velocity abrasive impingement is the primary wear mechanism. --- ### **5. International Standards** Class II Type C is a well-defined grade under the primary ASTM standard, distinguished by its high carbon content. | Standard | Title / Scope | Common Designations / Notes | | :--- | :--- | :--- | | **ASTM A532/A532M** | *Standard Specification for Abrasion-Resistant Cast Irons* | **Class II Type C** is the definitive standard for 15% Cr-Mo-HC martensitic white iron. | | **ISO 21988** | *Abrasion-resistant cast irons* | Can be cross-referenced. Equivalent ISO grades will specify similar high Cr, Mo, and high C content. | | **BS 4844** | *Abrasion resisting white cast irons* (British, historical) | **Grade 2C** is the equivalent high-carbon, 15% Cr grade. | | **JIS G5511** | *Abrasion-resistant white cast irons* (Japanese) | The **SMC 650** or similar high-hardness grades often correspond to this chemistry. | | **DIN EN 12513** | *Founding - Abrasion resistant cast irons* (European) | A grade like **G-X 360 CrMo 15 3** indicates a high-carbon (~3.6% C), 15% Cr, 3% Mo alloy, closely matching Type C. | **Specification Note:** Procurement requires precise specification of **"ASTM A532, Class II Type C."** Due to its high hardness and brittleness, critical supplementary requirements include: * **Minimum Hardness:** Strictly specified, often 650 HB or 700 HB minimum. * **Heat Treatment Protocol:** Detailed requirements for the destabilization temperature, time, and cooling rate to ensure consistent microstructure and hardness. * **Section Size Limitation:** Guarantee that specified hardness is achieved in the relevant casting wall thickness. * **NDT Requirements:** Rigorous non-destructive testing (e.g., magnetic particle inspection) is mandatory to detect any casting defects that could act as failure initiation sites under load. --- ### **Conclusion** Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron is the **ultimate choice for applications dominated by severe, unrelenting abrasive wear**. Its **high-carbon, high-chromium chemistry** is meticulously engineered to produce a **dense, interconnected network of hard carbides** within a supporting martensitic matrix, yielding **exceptional hardness and unparalleled resistance to material loss through abrasion**. While its low impact toughness necessitates careful application engineering to avoid brittle fracture, its performance in controlled, high-pressure grinding and sliding wear environments is unmatched among its peer grades. For components like grinding mill liners and slurry pump casings, where maximizing time between replacements directly drives operational efficiency and cost, Class II Type C delivers a reliable, high-performance solution justified by its extended service life. -:- For detailed product information, please contact sales. -: Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Specification Dimensions Size： Diameter 20-1000 mm Length <6495 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. -: Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Properties -:- For detailed product information, please contact sales. -:

Applications of Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube -:- For detailed product information, please contact sales. -:

Packing of Class II Type C 15% Cr-Mo-HC Martensitic White Cast Iron Tube -:- 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 2966 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