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Hot Extruded Tubes
Hot Extruded Tubes
Hot Extruded Tubes Product Introduction
Meta Title (≤60): Hot Extruded Tubes | Thick-Wall Seamless Alloy Steel Pipes for High Pressure
Meta Description (≤160): Complete guide to hot extruded seamless tubes: process features, performance advantages, typical grades, size range, and applications in petrochemical, boiler, and nuclear industries.
Keywords: Hot Extruded Tubes, Thick-Wall Seamless Pipe, Large Diameter Tubes, Alloy Steel Tubes, High Pressure Boiler Tubes, A335 P91, 12Cr1MoV, 316H, Nickel Alloy Tubes
1) Process & General Requirements
Hot extrusion is a key seamless tube manufacturing process, ideal for large-diameter, thick-wall, and high-alloy steels.
• Heated billets are extruded through a die at high temperature → one-step forming.
• Capable of producing OD 57–1200 mm, WT 6–200 mm, length up to 20 m.
• Especially suitable for high-alloy and hard-to-deform materials (Cr-Mo steels, Ni-based alloys).
Features:
• Uniform structure with dense, consistent mechanical properties.
• Thick-wall capability beyond conventional hot rolling or cold drawing.
• Wide material adaptability: carbon steel, alloy steel, stainless steel, nickel alloys.
2) Typical Grades
• Carbon & Low Alloy Steel: 20#, 16Mn, Q345 series
• High Temperature Alloy Steel: 12Cr1MoV, 15CrMo, A335 P22/P91/P92
• Stainless Steel: 304H, 321H, 316H, TP347H, Duplex 2205/2507
• Nickel Alloys: Inconel 600/625, Hastelloy C-276, Alloy 800H/825
3) Size Range
• Outer Diameter (OD): 57 mm – 1200 mm
• Wall Thickness (WT): 6 mm – 200 mm
• Length: 6–20 m (customized lengths available)
• Delivery Condition: heat treated (N, Q+T, solution), pickled, machined surface
4) Performance & Advantages
• High pressure resistance for petrochemical, boiler, and nuclear service.
• Excellent high-temperature performance, operating 400–650 °C.
• Corrosion resistance tailored by material choice (Cr-Mo, stainless, Ni-alloy).
• Good machinability for welding, flanging, and precision machining.
5) Applications
• Petrochemical: high-temperature heater tubes, reformer tubes, re-heater tubes.
• Power Plant Boilers: main steam pipes, reheat steam pipes, superheater tubes.
• Nuclear Industry: primary circuit piping, steam generator tubing.
• Pressure Vessels: thick-wall vessels, high-pressure reactors.
• Offshore Engineering: subsea oil & gas lines, corrosion-resistant piping.
6) Quality & Testing
• Chemical Analysis: furnace + spectrometer, low P/S control.
• Mechanical Properties: yield, tensile, elongation, high-temp creep/rupture tests.
• NDT: UT, ET, RT, MT, PT as required.
• Hydrostatic Test: 100% hydrotest per tube.
• Standards & Certifications: ASTM A335, ASME SA213, EN 10216, GB/T 5310, ISO, PED.
Hot Extruded Tubes — Material & Size Distribution
1) Carbon & Low Alloy Steel Tubes
• Grades: 20#, Q345B/C/D, 16Mn, API 5L L245–L415
• Sizes: OD 114–820 mm, WT 8–60 mm, L ≤ 12 m
• Applications:
• Structural: large-diameter foundation piles, bridge supports, columns.
• Pipeline: low-pressure fluid transport, offshore jacket structures.
• Pressure Vessels: low-temperature or normal-pressure shells.
2) High Temperature Alloy Steel Tubes (Cr-Mo Series)
• Grades: 12Cr1MoV, 15CrMoG, 10CrMo9-10, ASTM A335 P22/P91/P92
• Sizes: OD 89–610 mm, WT 12–120 mm, L ≤ 15 m
• Applications:
• Power Boilers: main steam, superheater, reheater tubes.
• Petrochemical Plants: high-temp & high-pressure exchangers, hydrocracking reactors.
• Process Pipelines: refinery hot service lines.
3) Stainless Steel & Heat-Resistant Tubes
• Grades: 304H, 321H, 316H, 347H, 310S; Duplex 2205/2507
• Sizes: OD 57–530 mm, WT 6–40 mm, L ≤ 12 m
• Applications:
• Chemical Industry: urea plants, corrosive pipelines, exchangers.
• Energy Sector: nuclear steam generator tubes, secondary circuit lines.
• Food & Pharma: corrosion-resistant processing pipelines.
4) Nickel-Based Alloy Tubes
• Grades: Inconel 600/625, Hastelloy C-22/C-276, Alloy 800H/825
• Sizes: OD 57–426 mm, WT 8–50 mm, L ≤ 8–10 m
• Applications:
• Corrosive Media: hydrometallurgical acid lines, chloride-rich environments.
• High-Temperature Units: ethylene cracking furnace tubes, chemical heaters.
• Nuclear & Offshore: critical nuclear piping, subsea oil & gas transport.
5) Size Distribution Characteristics (Summary)
• Large Diameter (OD 400–1200 mm): foundation piles, offshore jackets, nuclear main pipes.
• Medium Diameter (OD 114–426 mm): refinery piping, boiler tubes, pressure pipelines.
• Small Diameter (OD 57–108 mm): heater coils, high-pressure exchangers.
• Thick Wall (WT 30–200 mm): nuclear primary loops, pressure reactors.
• Thin Wall (WT 6–12 mm): exchangers, low-pressure pipelines.
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