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Help CenterSteel Pipe & Tube & Cast Steel Pipe，ISO 2531、EN 545、EN 598、ASTM A48、ASTM A536、DIN 1693
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1. Product Overview
Cast pipe is formed by one-time casting of molten metal, different from rolled and welded steel pipes. Molten iron or steel liquid is poured into hollow molds via centrifugal casting, sand casting or lost foam casting to form complete tubular components after cooling. It can integrally form flanges, sockets, reducers, stiffeners and other complex structures without secondary welding splicing. The products are divided into four categories: ductile iron pipe, gray cast iron pipe, cast steel pipe and wear-resistant alloy cast pipe. They feature thick wall & high rigidity, wear & impact resistance, soil corrosion resistance, vibration & noise reduction, and customizable special-shaped non-standard structures. Widely used in municipal water supply & drainage, gas transmission, mine slurry transportation, wear-resistant pipelines for metallurgy & power plants, industrial medium pipelines under medium pressure. They comply with national special standards for municipal & industrial casting, as well as international ISO & EN export standards.
Applicable Standards
Domestic StandardsGB/T 13295 Ductile Iron Pipes for Water and Gas, GB/T 12772 Flexible Cast Iron Pipes for Drainage, GB/T 8491 General Technical Conditions for Steel Castings, GB/T 26651 Wear-resistant Composite Cast Pipes
International Export StandardsISO 2531, EN 545, EN 598, ASTM A48, ASTM A536, DIN 1693
2. Main Material Grades & Application Conditions
Ductile Iron (QT450-10 / QT500-7)Spherical graphite structure with balanced strength and toughness, tensile strength ≥420MPa, anti-settlement & anti-ground deformation. Applied for municipal water supply, natural gas, sewage pressure pipe networks and underground main pipelines.
Gray Cast Iron (HT200 / HT250)Excellent vibration damping, noise reduction and wear resistance with low cost, relatively brittle. Used for gravity building drainage, indoor sewage, rainwater pipes and small low-pressure fittings.
Carbon Cast Steel (ZG230-450, ZG270-500)Much higher strength and toughness than cast iron, high temperature & medium pressure resistance. Suitable for metallurgical high-temperature flue gas, chemical medium pipelines, wear elbows and integral flange cast pipes.
Wear-resistant Alloy Cast Pipe (High Chromium Cast Iron, Manganese Alloy)Superior anti-scouring and slurry wear resistance, for mine tailings, power plant ash, coal powder and sand slurry transportation pipelines.
3. Complete Production Process
Raw material smelting → Furnace front composition test → Mold core making (sand core / metal mold) → Centrifugal / sand / lost foam pouring → Cooling & solidification → Shakeout & sand cleaning → Sprue cutting → Heat treatment (Annealing / Normalizing / Tempering) → Inner & outer surface grinding & cleaning → Anti-corrosion lining / external coating (cement mortar, coal tar epoxy, polyurethane, zinc coating) → Machining of joints (socket, flange, clamp groove) → Hydrostatic / air tightness test → Appearance & flaw detection → Marking & coding → Protection & packing for warehousing
4. Core Specification & Technical Parameters
Nominal Diameter Range: DN50～DN3000
Wall Thickness Grade: Standard municipal grades K8/K9/K10/K12, customized extra heavy wear-resistant wall; conventional wall thickness 6mm～100mm
Standard Fixed Length: 6m, 5m, 3m; customized short sections & special-shaped fittings 0.3–2m available
Characteristics by Casting Process
Centrifugal Casting: Uniform wall thickness, dense metallurgical structure, free of pores & slag inclusions, mainstream process for municipal ductile iron pipes
Sand Casting: Suitable for large-diameter, special-shaped elbows, tees and integral flange parts
Lost Foam Casting: High dimensional accuracy, mass production of complex wear-resistant cast pipes
Pressure Bearing Performance
Ductile water supply pipe: Standard working pressure 0.6MPa, 1.0MPa, 1.6MPa, test pressure 2 times working pressure
Cast steel & wear-resistant cast pipe: Max bearing pressure 6–10MPa, fit for industrial high-pressure slurry & high-temperature medium
Gray cast iron drain pipe: Gravity drainage without pressure, only bear overburden load
Anti-corrosion Lining & External Coating
Water supply inner lining: Cement mortar lining, food-grade epoxy coating (compliant with drinking water standards)
Sewage & industrial pipe: Coal tar epoxy, polyurethane anti-corrosion
External coating: Asphalt coating, zinc-aluminum alloy spray, epoxy powder to resist acid & alkali soil corrosion
Main Joint TypesT-type flexible socket joint, W-type clamp flexible joint, flange joint, mechanical self-locking joint, matched with rubber sealing rings, allowing slight foundation settlement and angular deflection with excellent seismic performance.
5. Core Product Advantages
Integral forming without welds for reliable sealingFlanges, reducers, elbows and reinforced structures are cast in one piece, eliminating leakage risks caused by welding, stable zero leakage for long-term underground pipeline service.
Thick wall & high rigidity, resistant to external pressure & settlementThick pipe wall resists deformation and cracking under overburden and road heavy load; ductile iron tolerates uneven foundation settlement.
Wear & corrosion resistance with long service lifeCast iron matrix resists soil electrochemical corrosion, internal lining isolates medium erosion; high-chromium alloy cast pipes resist high-speed slurry scouring, service life 5–10 times longer than ordinary steel pipes.
Vibration & noise reduction for silent fluid deliveryGraphite structure inside cast iron absorbs water flow impact noise, no resonance noise for drainage risers in high-rise buildings.
Flexible structural customization for harsh working conditionsCustom cast special-shaped elbows, tees, tapered pipes and integral support pipes to drastically reduce on-site assembly parts.
Sufficient stock & stable deliveryFull range of calibers and materials in stock, shipped from Tianjin Port, production cycle 5–7 days. Complete matching cast fittings (elbow, tee, blind flange, flange) available for simultaneous delivery.
6. Main Application Fields
Municipal Water Supply & Drainage: Urban main water pipes, rainwater & sewage pipe networks, cross-river water transmission pipelines, village water supply renovation
Gas Transportation: Medium & low-pressure buried natural gas & coal gas trunk pipelines
Building Drainage: Flexible cast iron sewage risers & horizontal pipes for high-rise residential buildings, hospitals and shopping malls
Mining & Metallurgy: Wear-resistant pipelines for tailings slurry, mineral powder and sand, blast furnace flue gas pipes
Thermal Power Plants: Fly ash & slag flushing pipelines, high-temperature dust removal flues
Chemical Industry: Medium & low-pressure acid-base wastewater, industrial circulating water cast steel pipe fittings
Water Conservancy Projects: Farmland irrigation, reservoir water diversion, pump station pressure outlet pipelines
7. Factory Inspection & Complete Qualification Documents
Full-item inspection for every batch, complete export supporting documents attached:
Full inspection of appearance, wall thickness, inner diameter, length and joint dimension
Individual hydrostatic / air tightness pressure test for each pipe
Magnetic particle / penetrant NDT to detect casting defects such as pores, cracks and shrinkage porosity
Spectral composition analysis, tensile & impact mechanical performance test for raw material
Anti-corrosion coating thickness & adhesion test
Material test certificate, factory certificate, heat number traceability document, SGS third-party inspection report, ISO certification document
8. Packaging, Marking & Logistics Delivery
Packaging: Plastic protective rings at both pipe ends to protect sockets & flanges, bundled with steel strips; large-diameter pipes fixed on wooden pallets separately, export pipes packed in wooden cases to avoid coating damage during transportation collision
Marking: Permanent printing on pipe body including nominal diameter, material grade, wall thickness grade, execution standard, heat number and manufacturer; product qualification label attached to each bundle, marked with pressure grade and anti-corrosion type
Delivery: Direct shipment from warehouse to Tianjin Port, suitable for 20GP/40HQ full containers and bulk carriers; delivery cycle 5–7 days, full container and LCL export supported
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