Wire Mesh Wound Polyethylene Pipe
Cross helically wound steel wires reinforced-polyethylene composite pipe (SRCP) is a kind of composite metal plastic pipe with excellent overall performance. With excellent pressure bearing performance, good flexibility, long-term resistance to acid and alkaline corrosion and abrasion, it is suitable for long-distance underground pipes for water supply and drainage, slurry transportation and the like, especially for subsidence region such as mining area, river channel.
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In order to better support the growth of the wind power bolt industry, the National Grid Quality Inspection Center has continuously enhanced its testing and research capabilities for wind power bolt products in recent years. The center is equipped with advanced equipment such as a 600-ton microcomputer-controlled electro-hydraulic servo horizontal tensile testing machine, giving it world-class technical advantages in terms of large measurement range and high precision. It can test wind power bolts up to 7 meters in length, making its testing capability the best in China. Beyond routine inspections, the center has also invested heavily in scientific research. In December 2011, the project titled "Research on the Core Technology of High-Strength Bolts for Wind Power" successfully passed the appraisal by the General Administration of Quality Supervision, Inspection and Quarantine.
The key research outcomes included material selection for 42CrMoA bolts based on the performance needs of wind turbine towers. Through performance testing and comparative analysis, the center studied the heat treatment process for 10.9-grade high-strength bolts used in wind power applications. These bolts achieve a tensile strength of 1060MPa and an elongation of 17%, exceeding current national standards. Building on these achievements, the National Grid Quality Inspection Center actively promotes the application of research results, improving the conversion rate of scientific findings. This led to the development of new high-plasticity, high-strength bolts by the Xuzhou Ruida Bolt Fastener Factory. These bolts meet mechanical performance requirements for wind power applications, with elongation higher than the national minimum standard of 7%. They are widely used in high-end structures like gas carriers, significantly enhancing enterprise competitiveness.
Recently, the National Grid Quality Inspection Center conducted in-depth testing on wind power high-strength bolts, large hex nuts, and washers for several companies, including Beijing Jingcheng New Energy Co., Ltd., Hunan Yinzhou Xiangshui Tiantangshan Wind Power Co., Ltd., Huaneng Zhongdian Changdao Wind Power Co., Ltd., Guodian United Power Technology Co., Ltd., Shandong Gaoqiang Fastener Co., Ltd., and Jiangsu Zhongcheng Technology Development Co., Ltd. Key inspection items include strength, hardness, shape, torque coefficient, and surface decarburization layer. Additional tests focus on bearing capacity, toughness, and heat treatment quality, helping enterprises solve challenges related to large-scale (≥ M39) and high-strength (≥10.9) wind power bolts. This ensures that mechanical properties, including fatigue limits, meet engineering quality requirements.
Wind power generation is increasingly being adopted as a clean energy source in China as the country adjusts its energy structure and accelerates renewable energy development. With around 70 large wind turbine manufacturers in China, several leading companies now produce 1.5MW-class wind turbines in mass. Wind power bolts are characterized by high strength, precision, and grade. As wind power capacity expands, the demand for stronger and more reliable bolts increases. Wind turbines operate under harsh conditions, facing extreme cold, temperature fluctuations, and high power loads. Due to difficult installation environments and limited access in mountainous areas, river valleys, and coastal regions, fasteners must have a service life of at least 10 years. In addition to mechanical properties, they must also exhibit resistance to cold and brittleness at low temperatures.