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                  GBT3077-1999 Alloy Structure Steel.pdf Download
                  BS EN 10297-1-2003 Seamless Circular Steel Tubes for Mechanical and General Engineering Purposes.pdf Download
                  ASTM A519-03 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service.pdf Download
                  ASTM_A333-04 Seamless and Welded Steel Pipe for Low-Temperature.pdf Download
                  ASME SA335 335M-2004 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service.pdf Download
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