Abstract
To address the problem of corrosion cracking, equipment has been developed of 06Kh20N8M3D21 austenitic-ferritic corrosion-resistant multiply alloyed steel. But as this steel is difficult to machine investigations were made to determine the parameters and conditions for machining Christmas tree parts made of this steel. Turning, drilling, thread cutting, and milling are specified. The optimum conditions for machining Christmas tree parts were established in tests. The tests also showed that the coefficient of machinability of the steel is 3 or 4 times less than that of 20KhGSL steel, which is normally used for Christmas tree production.
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