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Help CenterSteel Pipe & Cast Steel Tube，GB/T13295、ISO2531、ASTM A426
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1. Product Overview
Cast pipes are tubular castings produced by pouring molten metal through sand casting, continuous casting and centrifugal casting processes. Centrifugal cast pipes represent the mainstream product type. Under centrifugal force, molten metal uniformly adheres to the inner wall of the mould, delivering a compact metallurgical structure free of blowholes and shrinkage porosity. Featuring high strength, wear resistance, corrosion resistance and high temperature resistance, they are extensively applied in municipal water supply & drainage, gas transmission, petrochemical high-temperature furnaces, power boilers, metallurgical kilns and marine engineering.
2. Product Classification & Main Materials
(1) Ductile Iron Cast Pipes (Mainstream for Municipal Projects)
Material Grades: QT450-10, QT500-7, equivalent to ASTM A536 65-45-12
Chemical Composition (Mass Fraction) C: 3.5~4.0%; Si: 1.8~2.6%; Mn≤0.40%; P≤0.08%; S≤0.02%; Mg nodulizer: 0.04~0.08%
Mechanical Properties Tensile strength ≥420MPa; Elongation: ≥10% for DN80-DN1000, ≥7% for DN1100-DN2600; Brinell hardness ≤230HB
Applicable Working Conditions: Municipal water supply, sewage discharge, gas transmission, fire protection and agricultural irrigation, working pressure PN10~PN25
(2) Grey Cast Iron Pipes
Materials: HT200, HT250. Characterized by high brittleness, excellent vibration damping performance and low cost
Applications: Indoor building drainage, gravity sewage and rainwater pipelines
(3) High-Temperature Centrifugal Cast Steel Pipes (Special for Industrial High-Temperature Service)
HK40/ZG40Cr25Ni20 (310S): Long-term service at 900~1150℃, peak temperature resistance up to 1400℃, excellent sulfide corrosion resistance and thermal shock resistance; used for ethylene cracking furnaces, hydrogen reformers, power station boilers and waste incinerator tubes
ZG40Cr26Ni4Mn3NRe: Service temperature 1000~1150℃, outstanding wear and erosion resistance; applied to circulating fluidized beds and cement kiln pipelines
Cr5Mo/1Cr5Mo Cast Pipes: Medium-high temperature service at 500~650℃ for oil & gas pipelines and hydrogenation unit piping
(4) Carbon Cast Steel Pipes (General Structural & Industrial Use)
Grades LX235, LX345 (JG/T 300-2011). Used for steel structure columns, hydraulic cylinder barrels and low-pressure fluid transmission pipelines
3. Production Process (Standard Procedure for Centrifugal Cast Pipes)
Melting & Composition Adjustment: Medium-frequency furnace heating up to 1480℃, addition of nodulizing agents or alloy elements, real-time composition inspection via spectrometer
Centrifugal Casting: Molten metal at 1360~1380℃ is poured into high-speed rotating water-cooled metal moulds. Centrifugal force removes slag and gas, followed by rapid solidification via water cooling
Stress-Relief Annealing: Eliminate internal casting stress, optimize metallographic structure, improve toughness and prevent cracking caused by brittleness
Finishing: Fixed-length cutting, internal & external wall grinding, chamfering, machining of flanges and spigot & socket ends
Anti-Corrosion Coating: External surface zinc spraying + asphalt/polyurethane coating; internal surface cement mortar or epoxy ceramic lining
Full-Range Quality Inspection: Hydrostatic burst test, ultrasonic testing, magnetic particle inspection, dimensional & weight measurement, hardness test
4. Specification Parameters
1. Nominal Diameter Range
Ductile iron pipes: DN80 ~ DN2600mm High-temperature cast steel pipes: DN50 ~ DN1200mm Wall thickness standards: Class K, Class C (National & European standards), customized thick walls available
2. Standard Effective Length
6m, 8m, 12m; arbitrary fixed lengths can be cut per customer requirements
3. Joint Types
Type T / Type N1 Flexible Spigot & Socket Joint: Sealed with EPDM rubber gaskets, allowing 3~5° deflection, earthquake-resistant and adaptable to foundation settlement
Flanged Joint: For high-pressure service and equipment connection
Restrained Lock Joint: For long-distance large-diameter water transmission to prevent pipe separation
Straight Welded Joint: For industrial cast steel pipes connected by welding
4. Internal & External Anti-Corrosion Coatings
| Coating Position | Standard Anti-Corrosion Scheme | Execution Standard | Applicable Medium |
|---|---|---|---|
| Internal Lining | Cement Mortar Lining | ISO4179 | Drinking water, clean water transmission |
| Internal Lining | Epoxy Ceramic Coating | AWWA C205 | Sewage, weakly corrosive industrial wastewater |
| External Coating | Pure Zinc Layer + Asphalt Paint | ISO8179 | Buried pipelines in ordinary soil |
| External Coating | Polyurethane (PU) Coating | EN545 | Saline-alkali soil, highly corrosive soil, marine buried pipelines |
5. Core Product Advantages
High Strength & Toughness: Ductile cast pipes combine the corrosion resistance of cast iron and the toughness of steel. Resist fracture under ground settlement and heavy vehicle loads; centrifugal cast steel pipes feature denser structure without shrinkage cavities compared with ordinary sand castings
Outstanding Corrosion Resistance: Multi-layer anti-corrosion system delivers a service life of 50–100 years under normal working conditions, minimizing maintenance for buried installation
Earthquake-Resistant Flexible Structure: Flexible joints allow axial expansion, contraction and angular deflection, reaching seismic resistance grade 9 for seismic-prone areas
Efficient Fluid Transmission: Smooth inner coating reduces head loss and scale accumulation, lowering energy consumption for water delivery
Convenient Installation: Quick assembly via spigot & socket connections to shorten construction periods and cut labor costs; complete supporting fittings (elbows, tees, reducers, flanges) available in one-stop supply
Stable High-Temperature Performance (High-Temperature Cast Pipes): Resist creep, deformation and oxidation under high temperatures, free of cracks under alternating cold and hot cycles; replace imported furnace tubes to greatly reduce equipment costs
Eco-Friendly & Recyclable: All metallic materials can be remelted and recycled; lining coatings comply with drinking water sanitation standards, non-toxic and pollution-free
6. Applicable Standards
Domestic GB Standards
GB/T 13295 Ductile iron pipes for water and gas pipelines JG/T 300 Cast steel pipes for building structures GB/T 1348 General specification for spheroidal graphite iron castings
International Export Standards
ISO 2531, EN 545 (water supply), EN 598 (sewage drainage), AWWA C151, ASTM A999
7. Application Fields
1. Municipal Infrastructure (Main Application of Ductile Cast Pipes)
Urban main water supply pipelines, sewage networks, natural gas transmission pipelines, fire protection pipelines, long-distance water transfer reservoirs, agricultural irrigation
2. Petrochemical Industry (High-Temperature Cast Steel Pipes)
Ethylene cracking furnaces, hydrogen reformers, refinery heating furnaces, hydrogenation units, pipelines for sulfur-containing corrosive oil and gas
3. Power & Energy Industry
Superheater & reheater tubes of power station boilers, high-temperature flues of waste incinerators, new energy kilns, circulating fluidized bed boiler pipelines
4. Metallurgy & Building Materials Industry
Radiant tubes for steel rolling heating furnaces, high-temperature air ducts of cement rotary kilns, ceramic sintering kiln pipelines
5. General Industrial Use
Hydraulic cylinder barrels, load-bearing steel structure columns, mine slurry transmission pipelines, seawater desalination anti-corrosion pipelines
8. Quality Inspection Standards
Hydrostatic Test: 100% hydrostatic pressure test for each pipe; test pressure equals 1.5 times rated working pressure, no leakage or deformation under pressure holding
Non-Destructive Testing: Ultrasonic (UT) and magnetic particle (MT) inspection to detect shrinkage holes, cracks and slag inclusions on inner walls
Physical & Chemical Testing: Spectroscopic analysis of chemical composition for each melting batch; random sampling for tensile, impact and hardness mechanical tests
Appearance & Dimensional Inspection: Full inspection of wall thickness, outer diameter, length and socket dimensions; surfaces free of sand holes, cracks and peeling
Coating Inspection: Testing of zinc layer thickness, epoxy coating adhesion and lining compactness
9. Packaging, Delivery & After-Sales Service
Packaging: Small-diameter pipes bundled and fixed with steel strips, plastic end caps for pipe openings; large-diameter pipes wrapped with straw rope individually, protective films covering flange surfaces
Shipment Port: Tianjin Port; full-truck direct delivery from factory to inland destinations
Lead Time: 5–7 days for standard specifications; 7–12 days for customized special alloys or large-diameter products
Payment Terms: 30% TT advance payment, balance paid before shipment; Letters of Credit (LC) are not accepted
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