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Help CenterSteel Pipe & Tube & Cast Pipe，DN80、DN100、DN150、DN200、DN300、DN400、DN600、DN800、DN1000、DN1200、DN1600、DN2000、DN2600
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1. Product Profile
Cast pipes are integrated hollow tubular components manufactured with pig iron, carbon steel, heat-resistant alloy steel and stainless steel via centrifugal casting, sand casting, continuous casting and other forming techniques. Differing from hot/cold drawn seamless tubes and welded steel pipes, they stand as the optimal option for large-diameter, heavy-wall and special-shaped pipelines working under high-temperature, abrasive and corrosive environments. The product lineup covers ductile iron pipes, grey cast iron pipes, alloy cast steel pipes and heat-resistant centrifugal cast pipes, widely deployed in municipal fluid conveyance, high-temperature industrial furnaces, chemical anti-corrosion piping and mine abrasive material delivery.
2. Product Classification & Material Grades
2.1 Classified by Raw Material
Ductile Iron Pipes (Preferred for Municipal Works)Grades: QT450-10, QT500-7Production feature: Rare earth magnesium spheroidizer is mixed into molten iron to form spherical graphite, combining cast iron’s corrosion resistance and steel’s high toughness.Mechanical indicators: Tensile strength ≥420MPa, elongation ≥7%, maximum working pressure up to 6MPa, stable performance for areas with seismic intensity up to grade 9.
Grey Cast Iron Pipes (For Gravity Drainage)Grades: HT200, HT250Equipped with flaky graphite structure, these pipes deliver excellent shock absorption and noise reduction at competitive costs yet feature relatively high brittleness. The allowable working pressure is below 0.3MPa, only suitable for non-pressure sewage and rainwater pipelines.
General Carbon Cast Steel Pipes (For Industrial General Use)Grades: ZG230-450, ZG270-500Suitable for low-pressure fluid pipelines, mechanical cylinder barrels, dust removal ducts and more.
Heat-resistant Alloy Centrifugal Cast Pipes (For High-temperature Service)Cr-Ni alloy grades: HK40, HP40, ZG40Cr25Ni20, ZG30Ni35Cr15Long-term service temperature ranges from 800℃ to 1200℃, with outstanding resistance against high-temperature creep, sulfidation and carburization. Custom-made for cracking furnaces and heat treatment radiant tubes.
High-chromium Wear-resistant Cast Pipes (For Power Plants & Mines)Made of Cr15 and Cr26 high-chromium cast iron with exceptional abrasion resistance, used for conveying ash residues, ore pulp and desulfurization slurry.
Cast Stainless Steel Pipes (For Corrosive Media)Grades: ZG06Cr19Ni10, ZG06Cr17Ni12Mo2, resistant to acid, alkali and seawater erosion.
2.2 Classified by Casting Technology
Centrifugal Cast Pipes (Premium Mainstream Type)The rotating mold runs at high speed, pushing molten metal evenly against the pipe wall through centrifugal force, while internal slag and air bubbles float out automatically. The finished pipes feature dense metal structure, minimal blowholes and shrinkage cavities, uniform wall thickness (tolerance ≤5%) and smooth inner surface with roughness Ra3.2–6.3. Two types are available: water-cooled metal mold and coated metal mold, covering all standard sizes.
Continuous Cast PipesLong-length pipes formed in one step through horizontal continuous casting, featuring high production efficiency and low unit price, mainly applied to small & medium bore grey cast iron drainage pipes.
Sand Cast PipesA conventional manufacturing process resulting in rough surface and frequent defects. Only used for secondary low-pressure pipelines and gradually phased out of mass production.
2.3 Classified by Connection Type
Flexible Socket Joint: T-type, N1-type and X-type with rubber sealing gaskets, allowing 3–5° deflection and slight foundation settlement, standard fitting for municipal pipe networks.
Flange Joint: Adopted for high-pressure industrial pipelines and equipment connections.
Welded Joint: Used for assembling heat-resistant alloy cast pipes in high-temperature furnaces.
3. Standard Production Flow of Water-cooled Centrifugal Cast Pipes
Raw Material Melting: Proportionally feed pig iron and scrap steel into intermediate frequency furnaces, conduct desulfurization, deoxidation and carbon-silicon component adjustment.
Spheroidization & Alloy Modification: Add rare earth magnesium spheroidizer for iron pipes; supplement chromium, nickel and molybdenum for alloy pipes to adjust chemical composition.
Centrifugal Pouring: Rotate the pipe mold steadily at 500–1500r/min for quantitative pouring, then apply water cooling for rapid solidification and shaping.
Annealing Treatment: Eliminate casting internal stress, transform white iron structure into ductile ferrite to boost 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 pipelines, passivation treatment for high-temperature alloy pipes
Finishing & Inspection: Pipe end polishing, dimensional calibration, hydrostatic test and non-destructive flaw detection
Marking, Surface Protection & Warehousing
4. Core Product Merits
Strong pressure resistance and seismic stability: Ductile cast pipes own superior toughness and avoid fracture under uneven ground settlement or earthquakes; flexible joints ensure zero leakage.
Smooth inner bore: Fluid resistance is 30% lower than concrete pipes, effectively preventing scaling and blockage to cut transport energy consumption.
Extra-long service life: Buried service life reaches 50–100 years with intact anti-corrosion coating; fully recyclable and eco-friendly.
Outstanding high-temperature and wear resistance: Alloy centrifugal cast pipes can operate stably above 1000℃ continuously; high-chromium materials outperform ordinary steel pipes greatly in abrasion resistance.
Flexible large-diameter forming: Complete specifications DN80–DN2600 on offer; integrated casting of extra thick-walled pipes, special tees and elbows eliminates hidden risks from welding seams.
Simple installation: Socket flexible joints require no on-site welding, speeding up construction and lowering later maintenance costs.
5. Domestic & International Implementing 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 specifications: Hydrostatic test ASTM A999, non-destructive testing GB/T7233, mechanical performance test GB/T223
6. Specification Parameters
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 are acceptable
Wall thickness: Graded by pressure class K8/K9/K10/K12, ranging 6–50mm; thickened walls available for high-temperature and wear-resistant alloy pipes
Pressure rating: 0.3MPa (non-pressure drainage), 1.0MPa, 1.6MPa, 2.5MPa, 4.0MPa, 6.0MPa for heavy-duty industrial pipelines
7. Full-range Factory Inspection Items
Dimensional inspection: Outer diameter, wall thickness, socket size, length tolerance
Hydrostatic burst test: Every pipe undergoes pressure holding test with no leakage or permanent deformation
Mechanical property test: Tensile strength, elongation, Brinell hardness, impact toughness
Non-destructive testing: Ultrasonic (UT) and magnetic particle (MT) inspection to detect internal shrinkage, cracks and slag inclusions
Coating test: Anti-corrosion coating thickness, adhesive force and spark leak detection
Visual appearance check: No cracks, blowholes, sand sticking or peeling on inner and outer surfaces
8. Main Application Scenarios
8.1 Municipal Engineering
Urban main water supply lines, gas delivery pipelines, rainwater-sewage separation pipes, fire water supply networks, agricultural irrigation pipelines and old pipeline renovation projects.
8.2 Construction Industry
Gravity drainage for high-rise buildings, basement rainwater pipes, ventilation ducts for underground parking lots.
8.3 Power & Energy Sector
Boiler ash & slag discharge pipes, wear-resistant desulfurization pipelines for power plants, high-temperature boiler headers and steam transmission tubes.
8.4 Petrochemical Industry
Radiant tubes for ethylene cracking furnaces, convection tubes for heating furnaces, pipelines for acid & alkali corrosive medium delivery, high-temperature reformer furnace tubes.
8.5 Metallurgy & Heat Treatment
Radiant tubes for continuous annealing furnaces, furnace rollers and piping for high-temperature heat treatment workshops.
8.6 Mine & Building Materials Industry
Ore pulp conveying pipes, wear-resistant sand & stone discharge tubes and dust removal air ducts for cement plants.
9. Packaging, Logistics & Delivery Terms
Packaging Protection
Small & medium bore pipes: Seal both ends with pipe caps, bind with steel strips, each bundle maximum 5 tons
Large bore pipes: Independent protective wrapping for single pipes; separate packaging for socket rubber rings
Export goods: Wrapped with waterproof plastic film to prevent seawater corrosion during ocean shipment
Production Lead Time: 5–7 days for regular in-stock sizes; 7–15 days for customized alloy pipes or special anti-corrosion coating requirements
Export Ports: Tianjin Port, Qingdao Port, Lianyungang Port
Attached Documents: Mill test certificate, hydrostatic inspection report, NDT certificate, product qualification certificate and original manufacturer warranty
10. Product Selection Guide
Municipal water supply & gas transmission: Grade K9 ductile iron pipes with cement mortar lining and external zinc anti-corrosion coating
Building gravity sewage: HT200 grey cast iron pipes for low-cost non-pressure working conditions
Furnace equipment above 800℃: HK40/HP40 Cr-Ni alloy centrifugal cast pipes
Ore pulp & ash residue abrasive delivery: Cr26 high-chromium wear-resistant cast pipes
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