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High chromium cast iron pipe is a high-strength low-alloy rare earth heat, wear and pipe fittings suitable for power plant coal boiler systems, powder feeding, ash slagging pipe. RE wear resistant alloy pipes well, give full play to the high chromium cast iron wear resistance. Pressure is high. Applicable to any pressure level. Use in conjunction with the outer lining tight, using a special process to form a connection between the composite layer solution to ensure the reliability of operation, has good resistance to mechanical shock, thermal shock resistance, easy installation and connection, any cutting, welding.
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Hardness |
HRC ≥ 40 |
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Impact toughness |
≥ 14J/cm2 |
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Tensile strength |
≥ 700MPa |
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Hardness |
58-65 HRC |
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Tensile Strength |
500-800 MPa |
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Impact Toughness |
10-30 J/cm² |
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Corrosion Resistance |
Excellent (pH 4-12) |
Wear Resistance
High-chromium cast iron features dispersed carbides, a high carbide content, and high hardness (HRC ≥ 56), resulting in excellent wear resistance. High-chromium cast iron pipes maintain a low wear rate when subjected to material impact and friction, significantly extending their service life.
High-temperature Resistance
High-chromium cast iron has an austenitic or martensite matrix, making it resistant to high-temperature environments. For example, high-chromium pipe (ZGcr30) has a maximum operating temperature of 1300°C, making it suitable for high-temperature applications such as thermocouple protection tubes. High-chromium cast iron pipes maintain stability at high temperatures, ensuring the proper operation of piping systems.
Corrosion Resistance
Chromium forms a dense oxide film within the matrix, enhancing corrosion resistance. High-chromium cast iron pipes are resistant to chemical attack in many industrial environments. High-chromium cast iron pipes exhibit excellent corrosion and wear resistance even in wet conditions, in the presence of corrosive media, and under the action of particle erosion.
Hypoeutectic High Chromium Cast Iron Pipe
Eutectoid carbides are distributed in isolated strips or broken networks within a matrix of martensite and retained austenite. This type offers both high wear resistance and toughness, with superior impact resistance compared to hypereutectic types.
Eutectoid High Chromium Cast Iron Pipe
Carbides are hexagonal rods or curved strips, with a microhardness of 1300-1800 HV. This type offers significantly higher wear resistance than hypoeutectic types, making it suitable for high-load wear applications.
Hypereutectic High Chromium Cast Iron Pipe
The volume fraction of primary carbides is high, but toughness is extremely low, making it prone to cracking. This type offers the best wear resistance, but also a high casting rejection rate, requiring strict process control.
Power Industry: Used in raw coal system silos, hoppers, funnels, and pulverized coal conveying pipelines, effectively reducing wear and tear caused by materials like coal ash.
Coal Industry: Used in heavy ore preparation pipelines in coal preparation plants, wet coal conveying systems, and silt backfill in mining operations, improving conveying efficiency and reducing maintenance costs.
Mining Industry: Used in mine backfilling, concentrate and tailings conveying pipelines, protecting against ore abrasion and ensuring production safety.
Steel Industry: Used in coke pellet conveying pipelines, coal mill piping, separators, elbows, cones, and separation baffles, extending equipment life and reducing downtime.
Cement Industry: Used in pulverized coal and ore conveying, ensuring smooth cement production.
Machinery Industry: Used in the lining of power plant pulverizing, dust removal, and ash discharge systems, as well as in steel mill dust removal equipment, improving wear and corrosion resistance.
Smelting Ingredients:
The chemical composition of high-chromium cast iron is the foundation of its performance, with the Cr/C (chromium-carbon ratio) typically being the core design factor. Typical core chemical composition ranges include carbon (C) 2.0%-3.5% and chromium (Cr) 12%-30% (15%-28% is common).
Smelting and Pouring Temperatures:
The tapping temperature is typically controlled between 1480°C and 1520°C. The pouring temperature is determined based on the wall thickness and structure of the casting, typically ranging from 1380°C to 1450°C.
Heat Treatment:
The as-cast structure of high-chromium cast iron is typically austenite + eutectic carbides + some pearlite, resulting in low hardness and poor toughness. Heat treatment is required to achieve a martensitic matrix that provides high hardness and wear resistance. The core heat treatment process is "austenitization + quenching," supplemented by tempering to eliminate quenching stresses and improve toughness and stability.
Regular Inspections
External Inspections: At least once annually, inspect the pipeline's exterior for cracks, corrosion, and deformation, check the connecting flanges for deflection, and verify the integrity of all fasteners.
Key Inspections: At least once every three years, measure the thickness of susceptible areas, inspect welds for cracks and leaks, and verify valve tightness.
Comprehensive Inspections: At least once every six years, including magnetic particle testing, dye testing, and spot checks with radiographic or ultrasonic testing.
Operational Parameter Monitoring
Temperature and Pressure Control: Avoid prolonged over-temperature or over-pressure operation of pipelines to prevent material degradation.
Flow Rate Management: For pipelines transporting abrasive media, flow rates must be controlled to reduce erosion and wear. For example, the recommended flow rate for cement and pulverized coal pipelines is 10-15 m/s.
Cleaning and Purging
Pre-commissioning Cleaning: New or repaired pipelines must be cleaned of welding slag, rust, and other debris to prevent blockage or valve damage.
Chemical cleaning: The oil-free piping system must be degreased or chemically cleaned as required by the design documents.
Surface Treatment
Rust-Resistant Paint: Although high-chromium cast iron pipes are highly corrosion-resistant, they still require rust-resistant paint in humid or corrosive environments. Epoxy resin paint (for optimal rust prevention) or acrylic paint (for a more cost-effective solution) is recommended. Before painting, thoroughly clean any rust, oil, and dust from the surface to ensure proper adhesion.
Corrosion-Resistant Coating: For buried pipelines, an asphalt coating or coal tar epoxy paint can be used. Pipes exposed outdoors should use a more weather-resistant coating, such as polyurethane.
Electrochemical Protection
Sacrificial Anode Method: In areas with highly corrosive soils, magnesium or zinc alloy sacrificial anodes can be connected to protect the pipe body through an electrochemical reaction.
Impressed Current Method: Suitable for long-distance buried pipelines, a DC power supply provides a continuous protective current.
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