CARBON STEEL SEAMLESS RECTANGULAR PIPE SUPPLIER | ZHONGJING
【Specification】:10MM*20MM~700MM*300MM；Support customization
【Length】：6M,8M,12M;Support customization
【Thickness】: 0.6mm~25mm
【Material】：Carbon steel
【Surface】: Galvanized, black painted, or anti-rust oiled
【Standard】:AISI;ASTM:GB;DIN;BS;JIS
【Technique】: Seamless
【Shape】: rectangular;square;round
【Stock】: yes
【MOQ】: 5 TON
【Processing Service】:Bending, Welding, Punching, Cutting
【Production Capacity】：30000tons/Month
【Payment】 : T/T; LC; Paypal;
【Transport Package】 : Water Proof Paper Suitable for Transportation
【Application】：Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
Overview
Carbon Steel Seamless Rectangular Pipe is a premium structural product formed from a solid billet of carbon steel, eliminating the welded seam found in ERW pipes for superior strength and pressure resistance. Manufactured through a hot-extrusion or cold-drawing process, these pipes have a uniform wall thickness and consistent mechanical properties throughout the cross-section, making them ideal for high-pressure and high-stress applications. Available in various grades (e.g., ASTM A53, API 5L) and sizes (width: 1–24 inches, height: 1–24 inches, wall thickness: 0.065–1 inch), they combine the advantages of seamless construction with the structural efficiency of rectangular geometry.
The seamless design eliminates potential weak points at the weld joint, ensuring reliability in applications where failure could have severe consequences. These pipes undergo rigorous testing, including hydrostatic pressure tests and ultrasonic inspection, to meet international standards for quality and safety. They can be further processed with coatings or heat treatment to enhance corrosion resistance or mechanical properties.
Advantages
Superior Structural Integrity: No weld seam means uniform strength and resistance to fatigue, critical for high-pressure fluid transmission or heavy-load structural applications.
High Pressure and Temperature Resistance: Capable of withstanding pressures up to 5,000 PSI and temperatures ranging from -40°C to 400°C, depending on the grade and wall thickness.
Precision Dimensions: Cold-drawn pipes offer tight tolerances on width, height, and wall thickness (±1% for hot-extruded, ±0.5% for cold-drawn), ensuring consistent fitment in complex systems.
Versatile Grades: Available in low-carbon (for formability) to high-strength (for heavy loads), compliant with ASTM, API, and ISO standards for global project requirements.
Excellent Machinability: Smooth inner and outer surfaces allow for easy threading, flanging, or connecting with fittings, reducing fabrication time.
Application
Carbon Steel Seamless Rectangular Pipe is used in:
Industrial Piping Systems: For high-pressure oil/gas transmission, chemical processing lines, and steam distribution in refineries and power plants.
Structural Supports: As beams, columns, and trusses in buildings, bridges, and heavy machinery frames, leveraging the rectangular shape's superior moment of inertia.
Mechanical Components: In agricultural equipment (e.g., combine harvester frames), construction machinery (e.g., excavator booms), and automotive chassis for lightweight yet strong structures.
Architectural Applications: For decorative steel frames, handrails, and exposed structural elements in modern buildings, thanks to their smooth surface and uniform appearance.
Marine and Offshore: In offshore platform supports, ship hull structures, and seawater pipelines, where resistance to corrosion (with coatings) and high loads is essential.
FAQ
Q: Why choose seamless rectangular pipe over welded types?
A: Seamless pipes have no weld-related defects, making them safer for high-pressure/high-stress applications. Welded pipes are more cost-effective but less suitable for critical environments.
Q: What is the maximum length of seamless rectangular pipe?
A: Standard lengths are 20–40 feet, but custom lengths up to 60 feet can be produced, depending on the manufacturer's capabilities and transportation constraints.
Q: Can seamless rectangular pipes be bent or formed?
A: Yes, cold-forming is possible for moderate bends, but severe bending may require preheating to avoid cracking, especially for thicker walls.
Q: How is the quality of seamless pipes ensured?
A: They undergo non-destructive testing (ultrasonic, eddy current), hydrostatic pressure tests, and chemical/mechanical analysis to ensure compliance with standards and freedom from internal defects.
