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Help CenterSteel Pipe & Tube & Cast Tube，QT420-10、QT450-12，GB/T13295、ISO2531、HT200、HT250、ZG40Cr25Ni20（2520/HK40）、ZG3Cr24Ni7SiN、ZG40Ni35Cr26Si2
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1. Product Overview
Cast pipes are seamless pipes integrally formed by pouring molten cast iron or cast steel through centrifugal casting, sand casting and continuous casting processes. With no welding seams and dense metallographic structure, they are mainly divided into four categories: ductile iron cast pipes, gray iron cast pipes, heat-resistant alloy cast steel pipes and high-chromium wear-resistant cast pipes. Featuring high pressure resistance, high temperature resistance, corrosion resistance and superior wear resistance, they are widely applied in municipal water supply and drainage, gas transmission, chemical high-temperature furnaces, power plants, mine wear-resistant conveying and steel structure engineering.
Core Process Advantages (Mainstream Centrifugal Casting)
The high-speed centrifugal force enables uniform distribution of molten metal, achieving minimal wall thickness deviation. The pipe interior is free of shrinkage cavities, porosity and slag inclusions, with a density of no less than 99.5%.
Integral one-piece forming without welding seams delivers excellent leakage and burst resistance under high-pressure working conditions, far superior to welded pipes.
A wide range of customizable materials are available, including ordinary cast iron, carbon steel, high-chromium-nickel heat-resistant steel and bimetallic composite cast pipes.
Outstanding advantages in manufacturing large-diameter and thick-walled specifications with lower production costs than rolled seamless pipes and stable delivery cycles.
Customizable non-standard pipe diameters, wall thicknesses and lengths, supporting various connections such as flange, socket and thread types.
2. Product Classification and Material Parameters
2.1 Ductile Iron Cast Pipe (Main Municipal Product)
Material Grades: QT420-10, QT450-12, complying with GB/T13295 and ISO2531 standardsMechanical Properties: Tensile strength ≥420MPa, elongation ≥7%, maximum working pressure up to 6.0MPaSpecification Range: DN80～DN2600mm, wall thickness grades K7/K8/K9/K10/K12 (K9 is the general standard grade)Anti-corrosion Structure: External wall with zinc spraying + epoxy asphalt paint; internal wall lined with cement mortar or epoxy ceramic, resisting corrosion from groundwater and sewageApplications: Urban water supply, rainwater and sewage pipe networks, gas transmission and fire-fighting pipelines
2.2 Gray Iron Cast Pipe (Low-pressure Drainage)
Material: HT200, HT250Properties: Excellent vibration and noise reduction, cost-effective, working pressure ≤0.3MPa, relatively high brittlenessSpecifications: DN50～DN300Applications: Building indoor drainage and non-pressure sewage discharge for residential communities
2.3 High-chromium Nickel Heat-resistant Cast Steel Pipe (Industrial High-temperature Special Use)
Main Grades: ZG40Cr25Ni20 (2520/HK40), ZG3Cr24Ni7SiN, ZG40Ni35Cr26Si2High-temperature Resistance: Long-term service at 950～1150℃, instantaneous temperature resistance up to 1200～1250℃, with excellent thermal shock resistance and creep resistance, no cracking under rapid cooling and heating conditionsCorrosion Resistance: Resists vulcanization, carburization, acid and alkali flue gas, forming a dense chromium oxide protective film at high temperaturesApplications: Ethylene cracking furnaces, hydrogen production reformers, heat treatment carburizing furnaces, cement rotary kilns and power plant boiler tubes
2.4 High-chromium Wear-resistant Cast Pipe (Mining & Metallurgy Conveying)
Made of Cr15 and Cr26 high-chromium cast iron with hardness ≥58HRC. Its service life is 3-5 times that of ordinary steel pipes, suitable for wear-resistant conveying pipelines of ore pulp, coal powder and gravel.
3. Standard Dimensions and Connection Types
3.1 Length
Standard fixed lengths for municipal ductile pipes: 6m/8m/12m
Industrial heat-resistant cast pipes: Customizable lengths from 0.3m to 6m
3.2 Connection Types
T-type / N1-type flexible socket joint: Sealed with rubber rings, allowing slight angle deflection and foundation settlement, the mainstream choice for municipal projects
Flange joint: Applied to high-pressure chemical and high-temperature furnace pipelines with gasket sealing
Thread / groove joint: Used for small-diameter building water supply and drainage
Self-anchoring joint: Suitable for large-diameter deep burial and high-seismic-intensity areas
3.3 Dimensional Tolerance
Outer diameter ±0.8%, wall thickness ±5%, length ±10mm
4. Complete Production Process (Centrifugal Casting)
Batching and Melting: Pig iron and scrap steel are put into the furnace for desulfurization and alloy conditioning; nodulizers are added for ductile iron pipes, and chromium-nickel alloy ratios are adjusted for heat-resistant pipes.
Centrifugal Pouring: Molten metal is poured into high-speed rotating water-cooled metal molds at a rotating speed of 500-1500r/min for centrifugal layered solidification.
Cooling and Demolding: Rapid water cooling for forming, then pipe blank demolding.
Heat Treatment: Ductile iron pipes undergo high-temperature annealing to eliminate chill layers and improve toughness; heat-resistant cast steel pipes adopt 1100-1180℃ solution treatment to eliminate casting stress.
Surface Treatment: Sand blasting for oxide scale removal, external wall zinc spraying and internal wall anti-corrosion coating treatment.
Full Inspection: Hydrostatic burst test, UT/MT non-destructive testing, mechanical tensile and impact tests, dimensional re-inspection.
Marking and Packaging: Spray printing of specifications, furnace numbers and standards, packaged with steel strapping and waterproof films.
5. Quality Inspection Standards
Hydrostatic Test: Ductile iron pipes are kept under 1.5 times the working pressure for 30 minutes without leakage; heat-resistant cast pipes undergo high-pressure air tightness test according to working conditions.
Non-destructive Testing: UT ultrasonic testing, MT magnetic particle testing and RT ray testing to detect internal pores and cracks.
Mechanical Testing: Tensile test, Charpy impact test, Brinell and Rockwell hardness test.
Anti-corrosion Testing: Coating thickness test, adhesion test and acid-base immersion resistance test.
Executive Standards: National standards GB/T13295, GB/T8492, JG/T300; International standards ISO2531, ASTM A297, DIN17465.
6. Core Product Characteristics
High Pressure Safety: Integral seamless structure eliminates welding seam leakage risks, ensuring high stability for deep burial, high temperature and high-pressure working conditions.
Long Service Life: The underground service life of ductile cast pipes is no less than 50 years; high-chromium heat-resistant cast pipes can work continuously in high-temperature furnaces for 1-3 years.
Settlement and Earthquake Resistance: Flexible joints adapt to uneven foundation settlement, meeting 9-degree seismic design requirements.
Low Fluid Resistance: Smooth inner lining reduces fluid transmission loss and prevents scaling and blockage.
Broad Corrosion Resistance: Adaptable to groundwater, sewage, gas, high-temperature flue gas, weak acid and weak alkali media.
Customization Availability: Materials, pipe diameters, wall thicknesses, lengths, joints and anti-corrosion coatings can be customized as required, supporting small-batch sample production.
7. Main Application Fields
Municipal Engineering: Urban and rural water supply, rain and sewage diversion pipe networks, natural gas transmission and underground comprehensive pipe galleries.
Building Water Supply and Drainage: Sewage discharge and fire sprinkler pipelines for high-rise residential communities.
Petrochemical Industry: High-temperature pipelines for ethylene cracking furnaces, hydrogen production reformers and hydrogenation equipment.
Metallurgical Heat Treatment: Furnace tubes for annealing furnaces, carburizing furnaces and forging furnaces.
Energy and Power Industry: Power plant circulating water pipelines, high-temperature flue gas pipelines and desulfurization and denitrification pipelines.
Mining and Building Materials: Wear-resistant conveying of ore pulp and high-temperature inner lining pipelines for cement kilns.
Steel Structure and Bridge Engineering: Load-bearing cast steel pipe components for construction.
8. Transportation, Storage and Installation Precautions
Lifting and Transportation: Use flexible slings; avoid direct scratch on pipe orifices with steel wire ropes, and prevent falling and impact cracks.
Storage: Stack pipes with a cushion height of more than 30cm outdoors, keep rainproof and moisture-proof, and stack by pipe diameter classification.
Installation Key Points: Clean sundries at socket joints and install rubber rings in place evenly; ensure coaxiality for flange butt joint and avoid forced dislocation compression; reserve thermal expansion gaps for high-temperature cast pipe installation.
Usage Restrictions: Do not operate under excessive rated pressure and design temperature for a long time, and avoid severe alternating impact of media.
9. Foreign Trade Business Instructions
MOQ: 5 tons; conventional specifications in stock, customized non-standard products with a production cycle of 5-7 days.
Shipping Port: Tianjin Port
Payment Terms: 30% TT advance payment, 70% balance against bill of lading copy; LC payment is not acceptable.
Delivery Documents: Factory quality certificate, material test report, non-destructive testing report and certificate of origin.
Packaging: Steel strapping packaging with outer waterproof plastic film and protective caps for pipe orifices.
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