Good Quality,best service and reasonable price Manufacture of seamless steel pipe, like tubing and casing for well, coupling stock, etc.Our products are verified under the API 5L / API 5CT and ISO9001-2000 standard. The product details is as following:Seamless steel pipeGrade: H40, H45, J55, K55, N80 Tubing for well: 48.26mm - 114.30mm ODCasing for well: 114.30mm - 219.08mm ODcoupling stock:Grade ...