HUNAN GREAT STEEL PIPE CO.,LTD, WITH 30 YEARS OF STEEL PIPES MANUFACTURING, IS A WORLD-CLASS PRODUCTION AND SERVICE PROVIDER OF SUBMERGED ARC STRAIGHT SEAM WELDED PIPE AS THE FIRST SUBSIDIARY OF SHINESTAR GROUP. HUNAN GREAT STEEL PIPE CO.,LTD PAYS MORE ATTENTION TO IN THE PIPELINE ENGINEERING RESEARCH AREAS AS A PIONEER OF CHINA PETROLEUM PIPELINE & GAS PIPELINE SCIENCE RESEARCH INSTITUTE, SUCH AS: THE USE OF OIL AND GAS PIPELINES, PIPE WELDING TECHNOLOGY INNOVATION, HIGH-END PLUMBING MATERIALS RESEARCH AND DEVELOPMENT, AS WELL AS SPECIAL TOOLS TECHNOLOGICAL INNOVATION PIPELINE CONSTRUCTION, PIPELINE CORROSION PROTECTION SCIENCE AND TECHNOLOGY RESEARCH, SCIENCE AND TECHNOLOGY RESEARCH PIPELINE NON-DESTRUCTIVE TESTING, PIPELINE QUALITY ASSESSMENT, AND RESEARCH PIPELINE STANDARDS AND SO ON.