pipe oil assortment for u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438 in borehole and u0434u0443u043fu043bu0435u043au0441u043du0430u044f stainless steel used for oil country tubular goods for u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438

摘要

according to the invention u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438 assortment for oil pipe u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u044bu0432u0430u0435u0442u0441u044f in a borehole.according to the invention u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438 assortment for oil pipe made of duplex stainless steel, having a composition comprising, in percent by mass of t 0.005 to 0.03% c, 0.1 to 1.0% sifrom 0.2 to 2.0% mn, most 0.04% r, the more 0015% s from 18.0 to 27.0% of cr, from 4.0 to 9.0% ni, of no more than 0.04% al and from 0.05 to 0.40% n, and the rest is fe and impurities.and the structure with a portion of the u0430u0443u0441u0442u0435u043du0438u0442u0430 in the range of from 40 to 90%.according to the invention u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438 assortment for oil pipe has the yield from 276 to 655 mpa and a uniform elongation of more than 20%.therefore, the oil pipe assortment for u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0438 according to invention has high ability to u0440u0430u0437u0432u0430u043bu044cu0446u043eu0432u043au0435.