LINYI SANYUAN STEEL PIPE INDUSTRY CO. , LTD is a manufacture specializing in carbon seamless steel pipe . Some info of us are as follows: 1. Size : 1/ 2"to 4" wall thickness: Sch40 or sch80 2. Length: 5. 8m or 6m 3. Standard: ASTM A106/ A53/ API 5L GR. B 4. Certificate: API 5L, PED, ISO, CCS