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Help CenterSteel Pipe & Tube & Cast Steel Pipe，HT150、HT200、HT250、HT300、QT400-18、QT450-10、QT500-7、QT600-3、KTH350-10、KTZ450-06、KTZ650-02
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1. Product Definition & Core Overview
Cast pipe is an integral tubular product manufactured throughmolten metal pouring and casting technology. Different from rolled, cold-drawn and welded steel pipes, it is integrally formed by one-time casting via sand casting, metal mold casting, centrifugal casting and other processes. The pipe body features no welding seam, no rolling stress and dense and uniform microstructure. Cast pipes are mainly divided into three categories: ductile iron cast pipe, gray iron cast pipe and cast steel pipe, featuring high strength, high rigidity, excellent impact resistance, corrosion resistance, settlement resistance and reliable seismic sealing performance.
With stable pressure bearing capacity, high rigidity, non-deformation and long service life, the product is highly suitable for harsh working conditions such as municipal pipe networks, deep underground burial, geological settlement, sewage corrosion, gas transmission and industrial high-temperature and high-pressure fluid transportation. It serves as a core traditional pipeline material for water supply and drainage, gas, fire protection, chemical industry and building structural engineering.
2. Executive Standards
Domestic National Standards
GB/T 13295-2013 Ductile iron pipes, fittings and accessories for water and gas pipelines (main applicable standard)
GB/T 26081-2019 Ductile iron pipes, fittings and accessories for sewage applications
GB/T 17457-2019 Standard for cement mortar lining corrosion protection of ductile iron pipes
JG/T 300-2011 Cast steel pipes for building structures
GB/T 9439 General technical conditions for gray iron castings
GB/T 14183 General specification for cast steel pipes
International General Standards
ISO 2531 International standard for ductile iron pipes for water and gas supply
EN 545 / EN 598 EU standards for water supply, drainage and sewage iron pipes
ASTM A74 / A888 American standards for cast iron drainage pipes
3. Product Classification & Material Introduction
3.1 Classification by Material
(1) Ductile Iron Cast Pipe (Mainstream High-Grade Type)
Material grades: QT450-10, QT500-7. With spheroidal graphite distribution, it possesses excellent toughness, strength and impact resistance, close to steel properties. Featuring earthquake resistance, settlement resistance and anti-brittle fracture performance, it is the preferred cast pipe for current municipal water supply, gas and sewage engineering.
(2) Gray Iron Cast Pipe (Traditional General Type)
Material grades: HT200, HT250. It is cost-effective, high-rigidity, corrosion-resistant and vibration-damping with high hardness but relatively low toughness, mainly used for low-pressure drainage, rainwater and municipal gravity sewage pipe networks.
(3) Cast Steel Pipe (Industrial High-Temperature & High-Pressure Type)
Material grades: LX345, 20# cast steel, 45# cast steel, alloy cast steel. Integrally cast without welding seams, it features high temperature resistance, high pressure resistance and fatigue resistance, applicable to power stations, chemical industry, boilers, high-temperature flue gas pipelines and building steel structure support pipes.
3.2 Classification by Casting Process
Centrifugal Cast Pipe: Formed by high-speed centrifugation with uniform wall thickness, dense structure, no pores or sand holes and high precision, serving as the mainstream product for engineering projects.
Sand Cast Pipe: Suitable for large-diameter, special-shaped pipe fittings and non-standard thick-walled cast pipes with wide forming range, ideal for large industrial accessories.
3.3 Classification by Pressure Grade (Ductile Iron Pipe)
Common pressure grades: K9, K10, K12, C25, C30, C40. Higher grades represent thicker wall thickness and higher pressure resistance, adapting to municipal normal-pressure and medium-high pressure water supply and gas transmission working conditions.
3.4 Classification by Application
Water supply cast pipe, gas cast pipe, sewage drainage cast pipe, rainwater gravity flow cast pipe, industrial high-temperature cast steel pipe, building structural cast steel pipe, special fire-fighting cast pipeline.
4. Main Specifications & Connection Types
4.1 Specification Range
Nominal Diameter: DN80～DN2600 (full specification coverage)
Conventional Length: 6m/piece, 8m/piece, 9m/piece, customized fixed lengths available
Pressure Range: 0.6MPa～4.0MPa, meeting full-scenario pressure bearing requirements for municipal and industrial projects
4.2 General Connection Types
T-type Joint: The most widely used type with flexible rubber ring sealing, featuring fast installation and allowable slight angle deviation and settlement.
N1-type / X-type Joint: High sealing and anti-displacement performance, suitable for soft geological and settlement-prone road sections.
Flange joint, socket joint, welded joint (special for cast steel pipes)
5. Anti-Corrosion Coating & Lining Technology
Cast pipes have excellent anti-corrosion performance. A multi-layer protection system can be matched according to different medium scenarios to completely avoid rusting, scaling and secondary water pollution:
Inner Wall: Cement mortar lining, epoxy ceramic lining, food-grade epoxy coating (special for water supply)
Outer Wall: Asphalt paint spraying, epoxy coal tar pitch, zinc layer + anti-corrosion paint, polyethylene cladding
Special for Sewage: Thickened anti-corrosion lining, acid and alkali resistant special coating for anti-sulfide corrosion
6. Mechanical Properties & Testing Standards
6.1 Core Mechanical Indicators (Ductile Iron Pipe)
Tensile Strength: ≥420MPa
Yield Strength: ≥300MPa
Elongation after Fracture: ≥10%, with excellent toughness, foundation settlement resistance and seismic performance
Uniform hardness, outstanding impact resistance and extrusion resistance, no pipe burst or deformation risk
6.2 Factory Testing Items
100% piece-by-piece hydrostatic test with stable pressure and zero leakage
Full inspection of appearance, wall thickness, dimension and roundness
Metallographic structure detection, spectral material analysis, tensile and impact tests
Air tightness test (special for gas pipelines)
7. Production Process Flow
Raw material batching and melting → molten iron/steel refining and conditioning → high-speed centrifugal pouring / sand mold pouring → cooling and shaping → demolding and sand cleaning → annealing heat treatment → pipe end trimming → inner and outer wall anti-corrosion spraying/lining construction → hydrostatic/air tightness test → dimensional re-inspection → marking and identification → bundling and warehousing
The annealing process effectively eliminates internal casting stress, prevents later cracking and deformation, and ensures long-term service stability of deeply buried pipelines.
8. Core Product Advantages (Compared with Steel Pipes & PE Pipes)
Integral Casting Without Welds, Ultra-High SafetyIntegrally formed pipe body without weak welding points, with far higher pressure resistance and burst resistance than ordinary welded pipes.
High Rigidity, Anti-Settlement & Anti-Geological DeformationHigh pipe body hardness with excellent bending and compression resistance, no deformation after deep burial, suitable for road, subgrade and soft foundation construction.
Flexible Joint with Seismic & Leak-Proof PerformanceRubber ring flexible sealing allows slight pipe deflection and expansion, avoiding joint disconnection and water leakage during earthquakes and foundation settlement.
Excellent Corrosion Resistance & Ultra-Long Service LifeInherent metal corrosion resistance plus multi-layer anti-corrosion system, with underground service life of 50–100 years, far longer than plastic pipes.
Scale-Free & Stable Water QualitySmooth inner lining prevents bacterial growth and scaling, ensuring high water cleanliness and compliance with municipal drinking water standards.
High Temperature Resistance, Aging Resistance & Extreme Environment AdaptabilityResistant to high-temperature exposure, low-temperature cracking and acid-base corrosion, stable for outdoor, underground and chemical working conditions.
Convenient Construction & Ultra-Low Maintenance CostPlug-in rapid installation without complex welding, almost maintenance-free in later stage with lower comprehensive engineering cost.
9. Main Application Fields
Municipal Water Supply Engineering: Urban main water supply pipelines, community water supply, water plant water transmission systems
Municipal Gas Engineering: Urban medium and low-pressure gas transmission pipe networks
Drainage & Sewage Engineering: Urban sewage, rainwater, gravity drainage pipe networks, industrial park sewage pipelines
Industrial Pipeline System: Circulating water, high-temperature flue gas and process fluid transmission pipelines for chemical, metallurgical and power plant industries
Building Steel Structure Engineering: Cast steel support pipes, steel structure columns, large equipment load-bearing casings
Farmland Water Conservancy & Long-Distance Water Transfer Engineering: Large-scale water transmission, irrigation and water conservancy hub pipe networks
Fire Protection Engineering: Municipal main fire-fighting pipelines and high-pressure fire water supply systems
10. Installation & Operation Specifications
The trench shall be leveled and compacted during excavation to avoid suspended stress and local compression cracking of the pipe body.
For flexible joint installation, the rubber ring must be accurately positioned without distortion or offset to ensure complete sealing performance.
Expansion joints and fixed buttresses shall be installed for settlement-prone and river-crossing road sections to prevent displacement and pull-off.
Gas and high-pressure water supply pipelines shall be backfilled and compacted in layers, and large hard materials are prohibited from directly squeezing the pipe body.
Segmented hydrostatic/air tightness test must be completed and qualified before backfilling and covering soil after installation.
Cast steel high-temperature pipelines shall reserve thermal expansion gaps and be equipped with high-temperature anti-corrosion and thermal insulation structures.
11. Packaging, Quality Inspection & Customization Services
11.1 Packaging Method
Small-diameter pipes are bundled and protected with steel belts, and large-diameter pipes are independently protected; pipe ends are equipped with anti-collision protective rings, and pipe bodies are sprayed with specifications, material, standard, furnace batch number and pressure grade; the anti-corrosion layer is fully protected to prevent collision and scratch during transportation.
11.2 Factory Quality Warranty Documents
Full set of delivery documents including material certificate, mechanical property report, hydrostatic test report, air tightness test report and anti-corrosion inspection report are provided. SGS and BV third-party re-inspection and project bidding acceptance are supported.
11.3 Customization Services
Custom services for non-standard calibers, special wall thicknesses, high-pressure grades, special anti-corrosion linings, special-shaped cast pipe fittings and cast steel special-shaped pipe fittings are available, matching special working condition requirements of various municipal, industrial and steel structure projects.
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