In modern industrial systems, seamless steel pipes function like the "blood vessels" of the human body, where their internal quality is directly crucial to the safe operation of the entire system. Changzhou Tenjan Steel Tube Co., Ltd. has established a comprehensive non-destructive testing system, utilizing advanced technologies such as Ultrasonic Testing and Eddy Current Testing, to safeguard the quality of every seamless steel pipe leaving its factory, truly fulfilling its solemn commitment to "zero-defect" delivery.

Ultrasonic Testing: The "Industrial B-scan" with Remarkable Insight

As a core NDT technology for seamless steel pipes, Ultrasonic Testing works by utilizing the propagation characteristics of high-frequency sound waves within materials to detect internal defects. When ultrasonic waves travel through a seamless steel pipe, they encounter reflections from internal flaws like cracks, inclusions, and pores. By analyzing these echo signals, the position, size, and nature of defects can be precisely determined.

In Tenjan Steel Pipe's production system, Ultrasonic Testing is integrated throughout several key stages. Employing a multi-channel ultrasonic detection system with a probe frequency range of 2-10 MHz, it can detect defects as small as 0.5 mm. During inspection, the steel pipe rotates at a constant speed while the probe moves axially, achieving 100% full coverage inspection. It is particularly noteworthy that this system exhibits extremely high sensitivity to common defects in seamless steel pipes, such as longitudinal cracks, transverse cracks, and laminations.

Eddy Current Testing: The "Precision Sieve" for Surface Defects

Complementing Ultrasonic Testing is Eddy Current Testing technology. Based on the principle of electromagnetic induction, this technique detects changes in the eddy current field within conductive materials to identify surface and near-surface defects. For seamless steel pipes, Eddy Current Testing is particularly suitable for detecting fine surface cracks, folds, pits, and other similar flaws.

The eddy current testing system adopted by Tenjan Steel Pipe offers several technical advantages: detection speeds of up to 3 meters per second enable efficient online inspection; the use of differential probes provides high sensitivity to surface defects; simultaneously, it is equipped with absolute probes capable of accurately assessing defect depth. This system can detect minute surface cracks with a depth of 0.1 mm and length of 2 mm, providing reliable assurance for the surface quality of seamless steel pipes.

Synergistic Effect of the Dual Inspection System

The combined application of Ultrasonic and Eddy Current Testing forms Tenjan Steel Pipe's unique dual inspection system. These two technologies have their respective strengths: Ultrasonic Testing excels at detecting internal defects with greater penetration depth, while Eddy Current Testing is sensitive to surface flaws and offers high inspection speed. Their organic combination achieves comprehensive quality monitoring of seamless steel pipes, from the inside out.

In the actual production process, each seamless steel pipe must pass through these two inspection checkpoints sequentially. First, Eddy Current Testing quickly screens for surface defects; then, Ultrasonic Testing thoroughly examines the internal quality. Only after passing both tests can a steel pipe receive its "qualified" certification. This rigorous inspection process ensures the zero-defect quality of products delivered to customers.

Precise Execution of Standardized Operations

Tenjan Steel Tube has established a complete set of standardized operating procedures for NDT. All testing equipment is regularly calibrated to ensure the accuracy of inspection results. Inspection personnel must be certified and undergo regular training and assessment. The inspection process strictly adheres to national standards such as GB/T 5777 and GB/T 7735, and can also be executed according to international standards like ASTM and EN based on customer requirements.

Particularly regarding the setting of inspection parameters, Tenjan Steel Tube has accumulated extensive experience. Corresponding inspection process cards are developed for seamless steel pipes of different specifications and materials, clearly specifying key parameters such as probe frequency, inspection speed, and sensitivity. This meticulous management ensures the repeatability and reliability of inspection results.

Conclusion

Changzhou Tenjan Steel Tube Co., Ltd. safeguards the quality of every seamless steel pipe by establishing a scientific non-destructive testing system that perfectly integrates Ultrasonic and Eddy Current Testing. This relentless pursuit of quality not only reflects the company's sense of responsibility but also creates tangible value for its customers.

In the future, Tenjan Steel Tube will continue to deepen the application of NDT technologies, constantly improving its quality management level. Through concrete actions, it will fulfill the promise of "zero-defect" delivery, providing global customers with higher quality and more reliable seamless steel pipe products. Choosing Tenjan means choosing peace of mind.

Contact Phone: 0519-88789990

Website: https://www.tenjan.com/