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Spiral Weled Pipe

Performance Parameters
- Material: Commonly used materials include carbon steel or low alloy steel such as Q235, Q345, X42, X52, X60, X70, etc. Stainless steel or other special materials can also be used according to needs
- Yield strength (σs): indicates the maximum stress of the material before plastic deformation, the common range is 235MPa to 550MPa
- Tensile strength (σb): indicates the maximum stress of the material before fracture, the common range is 375MPa to 700MPa
- Elongation (δ): indicates the plastic deformation ability of the material, usually required to be ≥20%
- Impact toughness (AKV): indicates the impact resistance of the material at low temperature, usually required to be ≥27J (-20℃)

Description

Product Introduction

Spiral welded pipe is a steel pipe welded by spiral forming process with steel plate or steel strip as raw material. It has the advantages of high strength, large diameter and low cost. It is widely used in oil, gas, water conservancy, construction and other fields. Its flexible specifications and excellent performance make it an important material in the industrial field with broad market prospects. By selecting steel strips that meet the requirements, pre-treatment such as straightening and trimming is performed. The steel strip is rolled into a tube at a spiral angle by a forming machine. The weld is welded by submerged arc welding or high-frequency welding. The weld quality is then ensured by grinding and ultrasonic testing. The welded pipe is then sized and straightened to ensure dimensional accuracy and straightness. Finally, non-destructive testing and anti-corrosion treatment are performed to ensure product quality.

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Product Features
1. High strength: The weld of the spiral welded pipe is distributed in a spiral shape, with uniform force and high overall strength.
2. Large diameter: Spiral welded pipes can produce steel pipes with larger diameters, usually ranging from Φ219mm to Φ3000mm, or even larger.
3. Flexible length: The length of the spiral welded pipe can be customized according to demand, usually 6 meters to 18 meters.
4. Low cost: Compared with seamless steel pipes, the production cost of spiral welded pipes is lower and suitable for large-scale use.
5. Strong applicability: Spiral welded pipes can choose materials, wall thickness and surface treatment methods according to different needs.

Application Fields
1.Oil and gas transportation: Pipelines used to transport oil and gas over long distances.
2.Water conservancy projects: used for water pipelines, drainage pipelines, etc.
3.Building structures: used for large building structures such as bridges, docks, and pile foundations.
4.Chemical industry: used to transport chemical media.
5.Heating projects: Pipelines used to transport hot water or steam.

Product Parameters

Size parameters	Outer diameter (OD): The outer diameter of spiral welded pipes ranges from φ219mm to φ3000mm, or even larger. Outer diameter is an important parameter in design and use Wall thickness (WT): The wall thickness ranges from 5mm to 25mm, depending on the use requirements. Thick-walled pipes are mostly used in high-pressure and high-strength situations Length: The length of spiral welded pipes is usually 6m to 12m, and can also be customized according to customer needs Spiral angle: The spiral angle is generally 30° to 60°, and the size of the angle affects the forming and welding quality of the steel pipe Weld length: Since the weld of the spiral welded pipe is spiral, its weld length is longer than that of the straight welded pipe, usually 1.2 to 1.5 times the circumference of the steel pipe.
Performance Parameters	Material: Commonly used materials include carbon steel or low alloy steel such as Q235, Q345, X42, X52, X60, X70, etc. Stainless steel or other special materials can also be used according to needs Yield strength (σs): indicates the maximum stress of the material before plastic deformation, the common range is 235MPa to 550MPa Tensile strength (σb): indicates the maximum stress of the material before fracture, the common range is 375MPa to 700MPa Elongation (δ): indicates the plastic deformation ability of the material, usually required to be ≥20% Impact toughness (AKV): indicates the impact resistance of the material at low temperature, usually required to be ≥27J (-20℃)
Process parameters	Forming speed: The speed of spiral forming of steel strip is usually 10m/min to 30m/min Submerged arc welding (SAW): Suitable for thick-walled pipes, the welding current is generally 400A to 1200A, and the voltage is 30V to 40V High frequency welding (HFW): Suitable for thin-walled pipes, the welding frequency is generally 100kHz to 400kHz Welding speed: Usually 1m/min to 3m/min, depending on the wall thickness and welding method Welding groove: The welding groove of spiral welded pipe is usually V-shaped or X-shaped, and the groove angle is generally 60° to 70°
Quality Standards	Weld quality: The weld should be free of defects such as cracks, pores, slag inclusions, etc. The weld excess height is usually required to be ≤3mm, and the weld non-destructive testing pass rate should reach 100% Dimension tolerance: The outer diameter tolerance is usually ±1%, the wall thickness tolerance is usually ±10%, and the length tolerance is usually ±10mm Straightness: The straightness of spiral welded pipes is usually required to be ≤1.5mm/m Surface quality: The surface of the steel pipe should be smooth, without scratches, cracks and other defects
Application Parameters	Working pressure: The working pressure range of spiral welded pipe is usually 1MPa to 20MPa, depending on the wall thickness and material Working temperature: The working temperature range of spiral welded pipe is usually -20℃ to 450℃. Low-temperature tough materials are required in low-temperature environments Media type: Spiral welded pipe can be used to transport a variety of media such as water, oil, gas, chemicals, etc. Appropriate materials and anti-corrosion measures need to be selected according to the characteristics of the media
Anti-corrosion parameters	3PE (three-layer polyethylene): 3PE coating thickness is usually 2mm to 4mm FBE (fusion bonded epoxy powder): FBE coating thickness is usually 300μm to 500μm Asphalt coating Cathode protection: For buried pipelines, it is usually necessary to cooperate with the cathodic protection system, and the protection potential is generally -0.85V to -1.2V
Detection parameters	Nondestructive testing: Ultrasonic testing (UT): Detect internal defects of welds, Radiographic testing (RT): Detect internal defects of welds, Magnetic particle testing (MT): Detect surface and near-surface defects Hydraulic pressure test: The test pressure is usually 1.5 times the working pressure, and the pressure holding time is not less than 10 seconds Air tightness test: Used to detect the sealing performance of the pipeline, the test pressure is usually 1.1 times the working pressure

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