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Help CenterSteel Pipe & Tube & Cast Steel Pipe，DN80、DN100、DN150、DN200、DN300、DN400、DN600、DN800、DN1000、DN1200、DN1600、DN2000、DN2600
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1. Product Overview
Cast pipes are hollow tubular components integrally formed via centrifugal casting, sand casting, continuous casting and other processes using pig iron, carbon steel, alloy heat-resistant steel and stainless steel as raw materials. Different from hot-rolled/cold-drawn seamless pipes and welded steel pipes, cast pipes are the preferred choice for large-diameter, thick-walled, special-shaped pipelines and equipment operating under high-temperature, wear-resistant and corrosion-resistant working conditions. They are categorized into four major types: ductile iron cast pipes, grey cast iron pipes, alloy cast steel pipes and heat-resistant centrifugal cast pipes, which are widely applied in municipal fluid transportation, high-temperature industrial furnaces, chemical anti-corrosion pipelines, mine wear-resistant conveying and other scenarios.
2. Product Classification & Material Grades
2.1 Classification by Material
Ductile Iron Cast Pipe (Mainstream for Municipal Use)Grades: QT450-10, QT500-7Manufacturing Process: Rare earth magnesium spheroidizer is added to molten iron to form spherical graphite, combining the corrosion resistance of cast iron and high toughness of steel.Mechanical Properties: Tensile strength ≥420MPa, elongation ≥7%, maximum bearing pressure 6MPa, applicable to seismic zones up to magnitude 9 with excellent anti-seismic performance.
Grey Cast Iron Pipe (Gravity Drainage)Grades: HT200, HT250It features flaky graphite with outstanding vibration damping and noise reduction performance at low cost, yet relatively high brittleness. Operating pressure ≤0.3MPa, only suitable for non-pressure sewage and rainwater pipelines.
Ordinary Carbon Cast Steel Pipe (General Industrial Use)Grades: ZG230-450, ZG270-500Applied to low-pressure fluid pipelines, mechanical cylinder barrels, dust removal pipelines, etc.
Heat-resistant Alloy Centrifugal Cast Pipe (High-temperature Working Conditions)Fe-Cr-Ni alloys: HK40, HP40, ZG40Cr25Ni20, ZG30Ni35Cr15Long-term service temperature: 800–1200℃, featuring resistance to high-temperature creep, sulfidation and carburization. Specially used for cracking furnaces and heat treatment radiant tubes.
High-chromium Wear-resistant Cast Pipe (Mines & Power Plants)Cr15, Cr26 high-chromium cast iron with superior wear resistance, for conveying ash slag, ore slurry and desulfurization slurry.
Cast Stainless Steel Pipe (Corrosive Medium)ZG06Cr19Ni10, ZG06Cr17Ni12Mo2, resistant to acid, alkali and seawater corrosion.
2.2 Classification by Casting Process
Centrifugal Cast Pipe (High-end Mainstream)Molten metal is thrown evenly onto the pipe wall by centrifugal force under high-speed rotation of the mold, with internal slag and bubbles automatically floated and discharged. The finished product boasts dense metallographic structure, minimal shrinkage porosity and blowholes, uniform wall thickness (tolerance ≤5%) and smooth inner surface (Ra3.2–6.3). It is divided into water-cooled metal mold type and coated metal mold type, covering all specifications of cast pipes.
Continuous Cast PipeLong pipes formed in one step through horizontal continuous casting, with high production efficiency and competitive unit price, mainly used for small and medium-diameter grey cast iron drainage pipes.
Sand Cast PipeTraditional manufacturing technology with rough surface and many inherent defects, only adopted for secondary low-pressure pipelines and gradually phased out.
2.3 Classification by Joint Type
Flexible Joint: T-type, N1-type, X-type rubber sealing ring socket spigot joints, allowing 3–5° deflection and slight foundation settlement, standard configuration for municipal pipe networks.
Flange Joint: For high-pressure industrial pipelines and equipment connection.
Welded Joint: Splicing of alloy heat-resistant cast pipes for high-temperature furnaces.
3. Standard Production Process of Water-cooled Centrifugal Cast Pipes
Raw Material Melting: Pig iron and scrap steel are proportioned and melted in intermediate frequency furnaces for desulfurization, deoxidation and adjustment of carbon-silicon alloy composition.
Spheroidization & Alloy Modulation: Rare earth magnesium spheroidizer is added for cast iron pipes; chromium, nickel, molybdenum elements are supplemented for alloy pipes to adjust chemical composition.
Centrifugal Pouring: The pipe mold rotates uniformly at 500–1500r/min for quantitative pouring, followed by rapid solidification and forming via water cooling.
Annealing Heat Treatment: Eliminate internal casting stress, convert white cast iron structure to ductile ferrite to improve elongation and impact resistance.
Internal & External Anti-corrosion Treatment
Outer Wall: Zinc spraying + asphalt paint / coal tar epoxy coating
Inner Wall: Cement mortar lining for municipal water supply pipes, epoxy resin coating for chemical pipes, passivation treatment for high-temperature alloy pipes
Finishing & Inspection: Pipe end grinding, dimension calibration, hydrostatic test, non-destructive testing
Marking, Protection & Warehousing
4. Core Product Advantages
High Pressure Resistance & Seismic Performance: Ductile cast pipes feature excellent toughness, resisting fracture under uneven foundation settlement and earthquakes without leakage via flexible joints.
Smooth Inner Wall: Fluid resistance is 30% lower than concrete pipes, effectively preventing scaling and blockage to reduce transportation energy consumption.
Ultra-long Service Life: Underground service life reaches 50–100 years with intact anti-corrosion coating; 100% recyclable and eco-friendly.
High Temperature & Wear Resistance: Alloy centrifugal cast pipes can serve stably above 1000℃ long-term; high-chromium materials deliver far better wear resistance than ordinary steel pipes.
Superior Forming Performance for Large Diameters: Complete specifications DN80–DN2600 available; integrated casting of extra thick-walled pipes, special-shaped tees and elbows reduces hidden dangers caused by welding seams.
Convenient Installation: Socket spigot flexible joints require no on-site welding for fast construction and low subsequent maintenance cost.
5. Domestic & International Executive Standards
Ductile iron water supply pipes: GB/T13295-2019, ISO2531, EN545
Grey cast iron drainage pipes: GB/T12772-2016
Alloy cast steel pipes: GB/T8492-2014, ASTM A608 (heat-resistant centrifugal cast pipes)
Testing Standards: Hydrostatic test ASTM A999, non-destructive testing GB/T7233, mechanical property test GB/T223
6. Specification Parameter Range
Nominal Diameter DN: DN80, DN100, DN150, DN200, DN300, DN400, DN600, DN800, DN1000, DN1200, DN1600, DN2000, DN2600
Standard Single Pipe Length: 6m, 8m, 12m (custom fixed-length short pipes available)
Wall Thickness: Classified by pressure grades K8/K9/K10/K12, wall thickness 6–50mm; customized thickened wall for high-temperature and wear-resistant alloy pipes
Pressure Grades: 0.3MPa (non-pressure drainage), 1.0MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.0MPa high-pressure industrial pipes
7. Factory Full Inspection Items
Dimensional Inspection: Outer diameter, wall thickness, socket dimension, length tolerance
Hydrostatic Burst Test: Each pipe is pressure-held without leakage or permanent deformation
Mechanical Performance Test: Tensile strength, elongation, Brinell hardness, impact toughness
Non-destructive Testing: Ultrasonic UT, Magnetic Particle MT to detect internal shrinkage porosity, cracks and slag inclusion
Coating Test: Anti-corrosion coating thickness, adhesion strength, electric spark leak detection
Visual Inspection: No cracks, blowholes, sand adhesion or peeling defects on inner and outer walls
8. Main Application Fields
8.1 Municipal Engineering
Urban main water supply pipelines, gas transmission pipelines, rain-sewage diversion sewage pipes, fire water supply, agricultural irrigation pipe networks, reconstruction of old pipe networks.
8.2 Construction Engineering
High-rise gravity drainage, basement rainwater pipes, underground garage ventilation pipes.
8.3 Power & Energy Industry
Boiler ash and slag discharge pipes, power plant desulfurization wear-resistant pipelines, high-temperature boiler headers, steam transmission pipes.
8.4 Petrochemical Industry
Ethylene cracking furnace radiant tubes, heating furnace convection tubes, pipelines for acid-base corrosive medium transportation, high-temperature reformer furnace tubes.
8.5 Metallurgy & Heat Treatment Industry
Continuous annealing furnace radiant tubes, furnace rollers, high-temperature heat treatment furnace pipelines.
8.6 Mine & Building Material Industry
Ore slurry conveying pipes, wear-resistant sand and stone discharge pipes, cement plant dust removal air ducts.
9. Packaging, Transportation & Delivery Instructions
Packaging Protection
Small & medium-diameter pipes: Pipe caps to seal pipe ends, bundled with steel strips, each bundle ≤5 tons
Large-diameter pipes: Independent protection for single pipes, rubber gaskets packed separately for sockets
Export products wrapped with waterproof plastic film to avoid seawater corrosion
Production Lead Time: 5–7 days for conventional in-stock specifications
Supporting Documents: Mill test certificate, hydrostatic test report, NDT inspection certificate, standard product certificate, original manufacturer warranty certificate
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