In the industrial manufacturing sector, standard specifications of seamless steel pipes often fail to meet the precise requirements of special equipment. Changzhou Tenjan Steel Tube Co., Ltd. specializes in the deep customization of non-standard small-diameter, thick-walled seamless steel pipes. With sophisticated process technology and a comprehensive production system, we provide tailored pipe solutions for various industries. Our customization capabilities are reflected not only in the diversity of dimensional specifications but also in the precise control of material properties.

Precision Rolling: Core Technology for Small-Diameter, Thick-Walled Pipes

The production of small-diameter, thick-walled seamless steel pipes demands extremely high technical expertise. We employ advanced cold rolling and cold drawing processes, equipped with high-precision molds and CNC equipment, to ensure the accurate production of various non-standard specifications within the range of 10–108 mm outer diameter and 1–20 mm wall thickness. In particular, wall thickness tolerance can be controlled within ±0.05 mm, and the inner wall roughness can reach Ra ≤ 0.8 μm, meeting the requirements of precision hydraulic and pneumatic systems.

For different material characteristics, we formulate differentiated process routes. Carbon steel undergoes multi-pass rolling with small deformation to ensure uniform structure, while alloy steel is treated with intermediate annealing processes to eliminate work hardening and maintain stable material properties. This refined process control ensures that every seamless steel pipe delivers excellent dimensional accuracy and mechanical performance.

Materials Science: Precision Application of Special Alloys

In terms of material selection, we provide professional recommendations based on usage conditions. For high-temperature environments, we recommend chromium-molybdenum alloy steels such as 15CrMo; for high-strength requirements, we develop special alloy steels like 42CrMo. Each material undergoes rigorous chemical composition optimization and heat treatment process adjustments to ensure optimal performance.

We have established deep collaborations with renowned steel mills such as Baosteel and Xingcheng Special Steel to customize steel billets with special chemical compositions. By precisely controlling the content of alloying elements, optimizing the ratios of basic elements like C, Si, and Mn, and adjusting the addition of alloying elements such as Cr, Mo, and Ni, we enable seamless steel pipes to acquire specific performance characteristics tailored to special working conditions.

Heat Treatment Process: A Key Link in Performance Customization

Heat treatment is a critical process for ensuring the performance of seamless steel pipes. We are equipped with fully automated heat treatment production lines and use computer-controlled temperature systems with an accuracy of ±2°C. Depending on the material and usage requirements, we develop personalized heat treatment processes, including normalizing, annealing, quenching, and tempering, among other process routes.

Quality Assurance: Comprehensive Precision Inspection System

We have established a robust quality inspection system, where every seamless steel pipe undergoes comprehensive testing for dimensional accuracy, surface quality, and mechanical properties.

For non-destructive testing, we employ both ultrasonic flaw detection and eddy current testing for dual assurance. Ultrasonic flaw detection can identify internal defects with a sensitivity of φ0.5 mm flat-bottomed holes, while eddy current testing focuses on surface and near-surface defect detection, ensuring the flawless quality of seamless steel pipes.

Application Fields: Customized Solutions for Multiple Industries

Our non-standard small-diameter, thick-walled seamless steel pipes are widely used in various fields: in automotive manufacturing for high-pressure fuel systems and hydraulic systems; in instrumentation as protective tubes for precision measuring components; and in aerospace for hydraulic transmission and control systems.

Service Advantages: Professional Support for Small-Batch Customization

We support a minimum order quantity of 3 tons and offer sample trial production services. Our professional engineering technical team provides comprehensive technical support, from design consultation to process optimization. A complete after-sales service system ensures quality assurance for our customers. We promise "replacement or refund for quality issues" and provide technical consultation and usage guidance services. Regular customer follow-ups and quality tracking ensure that any issues during product use are resolved promptly.

Conclusion

Changzhou Tenjan Steel Tube Co., Ltd. is committed to providing deep customization services for non-standard small-diameter, thick-walled seamless steel pipes. We believe that with our sophisticated technology, strict quality control, and dedicated service, we can provide the most suitable product solutions for every customer. For customization services or technical consultation, please call 0519-88789990 or visit our official website at https://www.tenjan.com/. Let us use our professional expertise and attentive service to provide you with precise customized solutions for seamless steel pipes.