Duplex Steel Seamless Pipes Tubes Manufacturers

Industry knowledge

How can manufacturers of duplex seamless steel pipes ensure that the processing accuracy and dimensions of duplex seamless steel pipes meet the design requirements? Are there special testing methods to monitor this process?

In the field of duplex seamless steel pipe manufacturing, it is crucial to ensure that the processing accuracy and dimensions meet the design requirements. This is not only related to the performance of the product, but also a direct reflection of the commitment to customers. As a factory with ISO and PED certification, we are well aware that in high-demand application fields such as oil and gas, petrochemicals, desalination and geothermal industries, the accuracy and durability of duplex seamless steel pipes are non-negotiable standards.
Strategies to ensure that processing accuracy and dimensions meet design requirements
1. Selection and certification of top raw materials
The starting point of all high-quality products lies in high-quality raw materials. We select fully certified duplex stainless steel raw materials, such as S31803 (2205), S32750 (2507), etc. These materials, with their specific chemical composition (such as Cr content of 18% to 28%, Ni content of 3% to 10%, and possible additions of Mo, Cu, Nb, Ti, N and other elements), ensure the formation of a duplex structure, that is, ferrite and austenite each account for about 50%, thus giving the material excellent mechanical properties and corrosion resistance. We ensure that all raw materials meet international standards such as ASTM, JIS, DIN, EN, GOST, etc., and conduct strict chemical composition analysis and physical property tests before storage.
2. Advanced production technology and precision control
During the production process, we use advanced seamless pipe manufacturing processes such as extrusion, piercing, rolling and heat treatment, and each step is carefully designed and strictly controlled. Especially in the heat treatment stage, precise temperature control and cooling rate are used to ensure the uniform distribution of the duplex structure and avoid performance degradation caused by uneven phase change. In addition, we use high-precision CNC machine tools and automated equipment for cutting, bending and forming to ensure that each step of processing can achieve the accuracy required by the design.
3. Strict dimensional control and quality inspection
During the processing, we implement multiple inspection procedures to ensure that each step meets the established tolerance range. From the storage of raw materials to the delivery of finished products, dimensional measurement and appearance inspection will be carried out after each process to ensure that the key dimensions such as diameter, wall thickness, length, etc. of seamless pipes meet the design requirements. For finished products, we conduct 100% inspection according to customer requirements and international standards, including but not limited to the measurement of key parameters such as outer diameter, inner diameter, wall thickness, straightness, roundness, etc.
Specialized testing methods and monitoring mechanisms
1. Advanced testing equipment
We have our own testing laboratory, equipped with advanced and complete testing equipment such as spectrometers, metallographic microscopes, tensile testing machines, low-temperature testing machines, and X-ray testing machines. Spectrometers are used to quickly and accurately analyze the chemical composition of materials; metallographic microscopes are used to observe the microstructure of materials to ensure the correct proportion of dual-phase structures; tensile testers and cryogenic testers are used to evaluate the mechanical properties and low-temperature toughness of materials; X-ray inspection machines are used to detect possible defects inside seamless pipes, such as cracks, inclusions, etc.
2. Application of non-destructive testing technology
In addition to conventional dimensional and physical property tests, we also use non-destructive testing technologies such as ultrasonic testing (UT), eddy current testing (ET) and magnetic particle testing (MT) to conduct comprehensive inspections of seamless pipes. These technologies can detect surface and internal defects without destroying the material, ensuring the integrity and reliability of the product.
3. Continuous quality monitoring and improvement
We have established a comprehensive quality management system, including regular equipment calibration, personnel training, process audits and continuous improvement plans. Weekly production status reports not only record production progress, but also include key indicators of quality control to ensure that any deviations can be discovered and corrected in a timely manner. In addition, we actively collect customer feedback and combine the results of internal testing facilities to continuously optimize product design and production processes to meet the changing needs of the market.
As a company specializing in the manufacture of duplex steel seamless pipes, we ensure that the processing accuracy and dimensions of duplex steel seamless pipes meet the design requirements by selecting top-quality raw materials, adopting advanced production processes, implementing strict dimensional control and quality inspection, and using advanced testing equipment and non-destructive testing technology. We are committed to pursuing excellent quality through the implementation of a strict quality management plan to ensure the high performance and durability of all products. It is these comprehensive measures that have enabled us to stand out in the fierce market competition and become a trusted partner of many customers.