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Help CenterSteel Pipe & Tube & Cast Steel Pipe，LX235、SCW490-CF、ZG40Cr25Ni20、GX40CrNiSi25-12、ZGCr28、Cr26
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1. Product Overview
Cast tubes are mainly produced by centrifugal casting technology. Different from hot-rolled and cold-drawn seamless steel tubes, molten metal forms tubes under high-speed centrifugal force. The tube wall solidifies layer by layer from outside to inside with dense microstructure, few pores or shrinkage cavities and uniform wall thickness, featuring outstanding advantages in manufacturing heavy-wall tubes. They are divided into cast steel tubes, heat-resistant alloy cast tubes and ductile iron cast tubes. Integrated flanges, special-shaped tees, reducers and other complex pipe fittings can be cast in one piece without welding joints. With excellent high-temperature resistance, wear resistance and thermal shock resistance, they are widely used in industrial furnaces, high-temperature boilers, wear-resistant conveying pipelines, municipal fluid systems and heavy-duty pressure equipment.
Main Implementation Standards
Domestic StandardsJG/T 300-2011 Cast Steel Tubes for Building Structures, GB/T 13295 Ductile Iron Pipes for Water and Gas, GB/T 8492 General Standard for Heat-resistant Steel Castings
International Export StandardsASTM A660 High Temperature Centrifugal Cast Steel Tubes, EN 10295 Heat-resistant Centrifugal Cast Tubes, JIS G5201 Centrifugal Cast Steel Tubes SCW Series
Supporting Inspection StandardsGB/T 7233 Ultrasonic Testing, GB/T 9444 Magnetic Particle Testing, GB/T 241 Hydrostatic Pressure Test, Spectral Composition Analysis Standards
2. Main Materials & Applicable Working Conditions
2.1 Carbon Cast Steel Tubes (LX235, SCW490-CF)
Working condition: Medium & low temperature pressure pipelines below 450℃, building structural sleeves, common hydraulic cylinder barrels, water supply, drainage and gas transmission pipelines
Performance: Low carbon, low sulfur and phosphorus, excellent weldability and toughness with high cost performance; Tensile strength ≥490MPa, Yield strength ≥315MPa
Heat treatment: Stress relief annealing to eliminate casting internal stress and prevent deformation during machining
2.2 Ductile Iron Cast Tubes (Grade K9)
Working condition: Municipal rainwater, sewage, fire protection, urban gas and water transmission underground pipelines
Performance: Combine corrosion resistance of cast iron and toughness of steel; flexible joints with anti-seismic capacity; cement mortar lining inside to avoid scaling, service life over 50 years
Surface anti-corrosion treatment: External zinc spraying + asphalt paint, internal cement mortar lining
2.3 High Chromium Nickel Heat-resistant Alloy Cast Tubes (ZG40Cr25Ni20, GX40CrNiSi25-12)
Working condition: Industrial heating furnaces, heat treatment furnaces, boiler radiant tubes, cracking furnace tubes, high-temperature flue pipes above 1000℃
Performance: Stable long-term service at 1000~1200℃, excellent oxidation resistance, carburization resistance and sulfur flue gas corrosion resistance; no cracking under frequent cold & hot cycles with good thermal shock resistance
Heat treatment: High-temperature solution treatment at 1050~1200℃ to stabilize austenite metallographic structure
2.4 High Chromium Wear-resistant Cast Tubes (ZGCr28, Cr26)
Working condition: Mine slurry transportation, power plant pulverized coal pipelines, desulfurization wear-resistant pipelines, sand and gravel conveying pipelines with strong abrasion
Performance: Ultra-high hardness, wear resistance far superior to ordinary steel tubes, good anti-scouring and anti-particle abrasion performance
3. Specification Parameters
3.1 Size Range
Outer Diameter: DN50mm ~ DN1600mm, customized super-large caliber available
Wall Thickness: 8mm ~ 120mm, prominent advantage in manufacturing heavy-wall pressure-bearing barrels
Length: Single piece 1m ~ 6m, non-standard lengths and special-shaped cast tubes with integrated flanges / tees can be customized
3.2 Dimensional Tolerance
Outer diameter tolerance: +2/0mm for OD ≤150mm; +2.5/0mm for 150~300mm; +4~6/0mm for 300~1000mm
Wall thickness tolerance: ±1.5~3mm, extremely small tube wall eccentricity via centrifugal forming
Straightness: ≤1.5mm per meter, large caliber tubes can be mechanically straightened
3.3 Theoretical Weight Formula
W=0.02466×(Outer Diameter D - Wall Thickness S)×Wall Thickness S (kg/m)
4. Complete Production Process
Melting & Refining: Melt pig iron and scrap steel in electric arc furnace, desulfurize and dephosphorize, adjust alloy composition in real time via spectrum analysis; add chromium, nickel and silicon alloys for heat-resistant materials
Casting Preparation: Preheat pipe mould and spray thermal insulation coating, adjust centrifuge speed to 300~1500r/min
Centrifugal Casting: Inject molten metal above 1350℃ uniformly into high-speed rotating mould. Centrifugal force attaches metal tightly to mould wall, while impurities and bubbles separate inward and discharge
Staged Cooling: Water-cooled metal mould or rain cooling; outer layer solidifies rapidly, inner layer cools slowly to feed shrinkage and eliminate shrinkage cavities
Heat Treatment (Key Process)Carbon steel & cast iron: Low-temperature annealing to eliminate chill layer and casting stress; heat-resistant alloys: High-temperature solution + aging to strengthen high-temperature performance
Cleaning & Grinding: Shot blasting to remove surface oxide scale, gates and flashes, smooth pipe ends and deburr
Full-range Physical-Chemical & Non-destructive Testing
Anti-corrosion Treatment & Machining: Cement lining, zinc spraying, turning flanges and thread processing (on demand)
Mark Spraying, Anti-rust Protection, Packing & Warehousing
5. Mandatory Factory Inspection Items
5.1 Physical & Mechanical Tests
Tensile strength, yield strength, percentage elongation after fracture, normal temperature impact toughness and hardness test
Metallographic inspection of nodularity for ductile iron; high-temperature stress rupture test for heat-resistant cast tubes
Full heat spectral chemical composition analysis with strict control of harmful impurities S and P
5.2 Non-destructive Testing
Ultrasonic Testing (UT): Detect internal shrinkage cavities, delamination and cracks
Magnetic Particle Testing (MT): Inspect tiny surface cracks and subcutaneous casting defects
X-ray Testing (Optional for thick-wall high-temperature tubes): Deep internal defect detection
5.3 Hydrostatic Pressure Test
Test pressure calculated according to working conditions, hold pressure for more than 10 seconds without leakage. Conventional test pressure 0.6~6MPa for municipal ductile iron tubes; maximum test pressure up to 25MPa for high-temperature pressure-bearing cast tubes
6. Main Application Fields
High-temperature Industrial Furnaces: Radiant tubes for heat treatment furnaces, roller tubes, cracking furnace tubes, high-temperature boiler flue pipes, annealing furnace liners
Power Energy Industry: Pulverized coal conveying tubes of power plants, desulfurization wear-resistant pipelines, heavy-wall headers of waste heat boilers, circulating water pipes
Municipal Water Supply, Drainage & Gas: Urban rainwater and sewage pipe networks, fire pipelines, buried ductile iron gas transmission pipes
Metallurgical & Mining Wear-resistant Conveying: Slurry, sand and high-temperature slag conveying pipelines with abrasion
Heavy Machinery Pressure Components: Large hydraulic cylinder barrels, mill support rollers, heavy-wall pressure vessel cylinders, integrated flange cast tubes
Chemical High-temperature Corrosion Equipment: Cracking reaction tubes, high-temperature heat exchangers, anti-corrosion flue gas desulfurization pipelines
7. Core Product Advantages
Strong Capacity for Large Caliber & Heavy-wall Forming: Integrated seamless forming, capable of manufacturing super heavy-wall and super-large caliber barrels unachievable by ordinary hot-rolled tubes
One-piece Shaping of Special-shaped Pipe Fittings: Flanges, tees, elbows and reducers cast integrally without welding seams for higher pressure safety
Dense Microstructure with Fewer Internal Defects: Centrifugal force naturally discharges slag and gas, far less blowholes and shrinkage cavities than static sand casting
Outstanding High-temperature & Wear Resistance: High Cr-Ni heat-resistant cast tubes can serve continuously at 1200℃; high chromium material’s anti-scouring service life is much longer than common seamless tubes
Excellent Thermal Shock & Fatigue Resistance: Uniform stress distribution of casting metallographic structure, not easy to crack or deform under frequent cold-hot cycles
Flexible Customization: Material, wall thickness, length and joint types can be customized to adapt to various extreme working conditions
8. Delivery, Packing & Logistics
Delivery State: Blank state after annealing heat treatment; shot blasting bright surface, finish machined surface or anti-corrosion coated lining optional
Marking: Tube body sprayed with material, heat batch number, dimension, execution standard and qualified serial number
Packing: Small tubes bundled with steel strips and sealed by plastic caps at both ends; large-caliber heavy-wall cast tubes fixed on single wooden pallets and wrapped with anti-rust film
Delivery Lead TimeIn-stock carbon steel / ductile iron cast tubes: Delivery within 1~3 days; customized heat-resistant alloy, super heavy-wall and special-shaped cast tubes: 5-7 days, available for container shipment from Tianjin Port
Attached Documents with Shipment: Original spectral material report, mechanical test sheet, NDT report, hydrostatic test record and factory certificate
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