Zhongxin Tube
ABOUT ZHONGXIN PIPE
Founded in 2004 in Nanjing, China, Jiangsu Zhongxin Pipe Sci-Tech Co., Ltd. has over two decades of dedicated expertise in the manufacture and distribution of high-performance bimetal composite pipes, matching pipe fittings and flanges.
Our core product range includes Mechanically Clad Composite Steel Pipes, Metallurgically Clad Composite Steel Pipes, Internally Clad Composite Pipes, Weld Overlay Composite Pipes, Mechanically Lined Pipes, together with a full range of Pipe Fittings, Metallurgically Clad Fittings and Weld Overlay Flanges. Backed by profound technical accumulation and professional capabilities, we have established ourselves as a quality benchmark in the industry. Our products serve a wide range of demanding applications across key sectors including oil & gas, petrochemicals, offshore engineering, seawater desalination, electric power, geothermal energy, coal chemical, hydrogen energy, water/gas/salt energy storage, food & pharmaceuticals, and municipal water supply. Supported by superior product performance and comprehensive service solutions, we have established long-term strategic partnerships with renowned domestic and international enterprises including Sinopec, CNPC, CNOOC, ADNOC, CHN Energy, Power China, China Huaneng, Energy China, China Three Gorges Corporation, CATL, BYD and Alibaba Group, earning an excellent reputation and high credibility throughout the industry.
Boasting an annual production capacity of 200,000 metric tons, we provide customized engineering solutions for the most severe operating conditions, which are precisely tailored to our customers’ diverse requirements. Our product quality strictly complies with internationally recognized standards, including API-5LD, DNV-ST-F101, SHELL DEP 31.40.20.32-Gen, and ADNOC-AGES, as well as other leading industry specifications. Backed by robust technical strength, we demonstrate core competitiveness in the bimetal composite pipe sector and support the high-quality development of industries worldwide.
Quality
The Testing and R&D Center of Jiangsu Zhongxin Pipe Sci-Tech Co., Ltd. has achieved CNAS laboratory accreditation (in accordance with ISO/IEC 17025), demonstrating comprehensive testing and quality control capabilities from raw materials to finished products. Supported by a rigorous quality assurance system and a robust traceability process, we ensure that every bimetallic composite pipe meets the requisite technical standards.
Core Testing Capabilities
Our laboratory is equipped to perform a wide range of specialized tests independently, including chemical composition analysis, mechanical property testing, metallographic examination, corrosion testing, Positive Material Identification (PMI), and process performance evaluation, covering the entire production lifecycle of bimetallic composite pipes.
Primary Testing Equipment
● Dimensional and Geometric Accuracy Testing: Equipped with thread gauges, roughness testers, and laser length measuring instruments to ensure dimensional accuracy.
● Mechanical Property Testing: Features electronic universal testing machines, electro-hydraulic servo pressure testing machines, force loading test benches, and Vickers/Leeb hardness testers. This suite supports tensile, flattening, bending, hardness, and joint strength evaluations.
● Composition & Metallographic Analysis: Utilizes atomic emission spectrometers, PMI analyzers, metallurgical microscopes, stereo microscopes, and ferrite content testers to guarantee the accuracy and traceability of material chemistry and physical properties.
● Corrosion Testing: Employs intergranular corrosion test systems, pitting corrosion test systems, crevice corrosion test systems, salt spray chambers, and high-temperature, high-pressure autoclaves (0-80MPa) for comprehensive material corrosion resistance assessment.
● Non-Destructive Testing (NDT): Equipped with ultrasonic flaw detectors, eddy current testing equipment, ultrasonic thickness gauges, and endoscopic eddy current detectors, supporting various NDT methods including UT, PT, RT, and VT.
●Performance & Environmental Simulation Testing: Features pressure test systems, vacuum test systems, pipe joint vibration tables, and hot/cold cycling testers for verifying the safety, reliability, and stability of piping systems under simulated service conditions.
Key Testing Procedures
● Material Composition Verification (PMI) : PMI analyzers are employed to verify the chemical composition of the cladding layer on bimetallic composite pipes. Test data is stored in real-time and fully traceable, ensuring strict control over raw material compliance from the outset.
● Mechanical Property Testing: Utilizing universal testing machines, pressure testing machines, and impact testers, we perform tensile, flattening, and bending tests to confirm the mechanical strength and structural integrity of the bimetallic composite pipes.
● Hardness Testing: Both Vickers and Leeb hardness testers are used for destructive and non-destructive hardness evaluation of the pipe body and weld zones, ensuring hardness metrics align with specific service conditions.
● Corrosion Resistance Evaluation: Specialized tests, including salt spray, intergranular, pitting, crevice, and high-temperature/high-pressure corrosion assessments, comprehensively evaluate corrosion resistance, ensuring suitability for demanding environments in the oil & gas and chemical industries.
● Non-Destructive Testing (UT/RT/ET/VT) : An integrated approach using ultrasonic, radiographic, eddy current, and endoscopic eddy current techniques provides full coverage inspection of pipe inner/outer surfaces, welds, and cladding layers to accurately detect hidden defects.
● Wall Thickness & Dimensional Inspection: Ultrasonic thickness gauges precisely measure wall thickness, supplemented by specialized gauges for dimensional accuracy verification, ensuring compliance with specified tolerances.
● Hydrostatic Pressure Testing: Dedicated hydrostatic test equipment is used to assess the sealing integrity and pressure-bearing safety of the bimetallic composite pipes.
● Metallographic Examination: Metallurgical microscopes are utilized to analyze the microstructure of both the base metal and the cladding layer, providing critical data for ensuring material physical properties.
● Environmental Adaptability Testing: Tests such as pipe joint fatigue vibration and thermal cycling simulate operational environments to validate the long-term safety, reliability, and stability of the product in service.
Equipment Calibration & Management
A detailed calibration schedule is established and adhered to for all laboratory testing equipment, ensuring that instruments requiring calibration remain within their valid certification period. The company strictly implements equipment status management and calibration protocols to guarantee the validity and traceability of all test results.
Quality Assurance System
The company rigorously adheres to applicable international and domestic standards, including ISO 9001, API 5LD, ASME, ASTM, and GB/T 31940. We have established a comprehensive quality control and full-process tracking system for bimetallic composite pipe production. With our CNAS-accredited laboratory serving as the core technical support, we achieve closed-loop quality control covering incoming raw materials, in-process production, and final product release. By strictly following national and industry specifications, we ensure that every product meets quality benchmarks and delivers reliable performance.
Zhongxin Pipe upholds an unwavering commitment to quality, safety and sustainable development, backed by globally recognized certifications and industry-leading qualifications.
Each certification attests to our strict compliance with international standards and continuous improvement, demonstrating our resolve to meet and exceed the most demanding global requirements. Supported by ISO, API 5LD and CNPC HSE accreditations, our systematic management ensures world-class reliability for our products and services, earning long-term trust from customers in oil & gas, chemical, offshore engineering and power industries worldwide.
By pursuing excellence in quality, safety, environmental protection and occupational health, we fulfill our promise of unmatched reliability and superior performance in everything we do.
People & Expertise
We have assembled a professional team in pipeline manufacturing, including more than 30 senior technicians with over 10 years of frontline experience, as well as experienced quality inspectors, process engineers, and international sales specialists.
Our team is well-versed in international standards such as API, ASTM, ASME, and EN, and excels in providing customized piping solutions, technical communication, and full documentation support for large-scale projects.
Based on professionalism and quality commitment, we continuously create long-term value for global customers.