CASE HARDENED STAINLESS STEEL OILFIELD TOOL

摘要

An oilfield tool comprising a body of high chromium, low carbon steel and a high hardness surface having a supersaturated level of carbon. The body may be manufactured from a Super 13Cr type stainless steel. The tool may be carburized to a supersaturated level providing a surface hardness of about 55 HRC to 62 HRC and have an effective case depth of at least 0.020 inch at which depth the hardness is 50 HRC. The tool body is heat treated to a body hardness of about 39 HRC. A surface of the tool may be surface coated, e.g. nitrided or borided. The tool may be an expansion cone and may be a variable diameter expansion cone.