... 2. Standard: ASTM, API, DIN Shandong Baodelong Steel Pipe Manufacturing Co, .Ltd produced below steel pipe professionally:1) Large Diameter Carbon Seamless ... -151-635-99222Fax: +86-635-2185499Skype: denise456307BrandShandong Baodelong Steel Pipe Manufacturing Co.,Ltd Hot Expanded Large Diameter Carbon Steel Seamless Pipe