Our company have the certificates of API, ISO9001. We can produce the products high qulaity with the most competitiv price as the following: The mian produces are all kinds of API 5CT standard tubing, casing and coupling, from 60mm--508mm, with steel grade at H40, J55, K55, N80, L80, C90, C95, P110, and many other tubing and casing such as large size casing, Russian GOST standard casing, fulsh max casing, solid expandable casing, thermal recovery of couplings, non -API casing and so on. With annual processing capicity of 200, 000tons of casing and 500, 000pieces of coupling, the product compeletely comppliance with the American petroleum institute API SPEC 5CT, API spec 5CT, API sPEC 5B and GOST 632-80standard.
