... , API, DIN Shandong Baodelong Steel Pipe Manufacturing Co, .Ltd produced below steel pipe professionally:1) Large Diameter Carbon Seamless ... DIN1629-1948, DIN2448, EN10216-1, EN10217-1, SY/T5037-2001, GB/T9711.1 etc.Quality Control : BV, SGS, LloydsSurface ... -635-2185499Skype: denise456307BrandShandong Baodelong Steel Pipe Manufacturing Co.,Ltd Hot Expanded Large Diameter Carbon Steel Seamless Pipe