JIS G3444 ERW/HFW Welded Pipe
1. Specification Details
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Available in a wide spectrum, usually ranging from 10.5mm to 660.4mm. Tailored outer diameters can be arranged to meet specific project demands.
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Common lengths are 3m, 6m, 9m, and 12m. For specialized projects, we offer custom cut - to - order lengths, ensuring a perfect fit for your unique requirements.
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Wall thickness varies from 0.8mm to 20mm. This wide range allows for selection based on the necessary pressure - bearing capacity and application - specific needs.
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These pipes are available in Electric Resistance Welded (ERW) and High - Frequency Induction Welded (HFW) types. Each welding method offers distinct advantages in terms of weld quality, production efficiency, and cost - effectiveness.
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2. Material Characteristics
Our JIS G3444 ERW/HFW welded pipes are crafted from high - quality carbon steel. The carbon content is carefully regulated to strike an optimal balance between strength and formability. The addition of other alloying elements in small amounts further enhances the material's properties. This carbon steel composition provides good corrosion resistance in normal operating environments, making it suitable for a wide range of applications. Additionally, the steel's properties allow for easy cold - forming during the manufacturing process, enabling the production of pipes with various shapes and sizes.
3. Mechanical Properties
- Tensile Strength: These pipes typically have a minimum tensile strength of 315 MPa. This tensile strength ensures that the pipes can endure substantial mechanical stress without deformation or rupture, making them reliable for applications where strength is crucial.
- Yield Strength: With a minimum yield strength of 185 MPa, our JIS G3444 welded pipes offer excellent resistance to permanent deformation under applied loads. This property is vital for maintaining the integrity of the pipes during operation and installation.
- Elongation: The elongation percentage is generally not less than 20%. This relatively high elongation value indicates good ductility, allowing the pipes to be bent, flanged, or otherwise shaped during installation without cracking.
4. Manufacturing Process
The manufacturing of our JIS G3444 ERW/HFW welded pipes adheres to a highly precise and stringent process. For ERW pipes, high - quality steel coils are first uncoiled and flattened. The edges of the flattened steel are then joined using an electric resistance welding process, where an electric current is passed through the edges to heat and fuse them together. This creates a strong, continuous weld. In the case of HFW pipes, high - frequency induction heating is used to heat the edges of the steel strip to the melting point, and then pressure is applied to form the weld. After welding, the pipes undergo a series of quality control checks. This includes visual inspection for surface defects, dimensional inspection to ensure compliance with the specified outer diameter and wall thickness, and non - destructive testing such as ultrasonic testing and hydrostatic testing to verify the integrity of the weld and the overall pipe structure.
5. Application Range
- Water and Gas Distribution: Our JIS G3444 ERW/HFW welded pipes are extensively used in water supply and gas distribution systems. Their reliable mechanical properties and corrosion resistance make them suitable for transporting water and gas over long distances, ensuring a stable supply to households and industries.
- Construction Industry: In construction projects, these pipes are used for structural applications, such as in building frameworks and scaffolding. Their strength and ability to be easily fabricated into different shapes make them a preferred choice for construction professionals.
- Mechanical Engineering: They find applications in mechanical engineering, for example, in the manufacturing of machinery and equipment where pipes are required to convey fluids or provide structural support. The pipes' good mechanical properties enable them to withstand the operational stresses in such applications.
6. Quality Assurance
We are committed to delivering top - notch JIS G3444 ERW/HFW welded pipes. All our products are manufactured in strict accordance with JIS G3444 standards. Each batch of pipes undergoes comprehensive quality control procedures. Chemical composition analysis is carried out to verify the correct alloy content. Mechanical property testing, including tensile, yield, and elongation tests, is conducted to ensure compliance with the specified strength requirements. Non - destructive inspection methods, such as ultrasonic and radiographic testing, are used to detect any potential defects in the weld and the pipe body. We operate under a quality management system certified to ISO 9001, which ensures consistent quality in every stage of production, from raw material procurement to the final inspection of the finished pipes. Our experienced quality control team closely monitors the entire manufacturing process to guarantee that our customers receive welded pipes of the highest standard.
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