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Stainless non-magnetic steel with high manganese and chromium content, with high resistance to stress corrosion and usable for drilling equipment and methods for the production of rods of this steel
Stainless non-magnetic steel with high manganese and chromium content, with high resistance to stress corrosion and usable for drilling equipment and methods for the production of rods of this steel
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机译：高锰和铬含量的不锈钢非磁性钢，具有较高的抗应力腐蚀性能，可用于制造该钢棒的钻孔设备和方法
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摘要
Steel with austenitic structure, characterised by the respective mass proportions of the following elements: carbon /= 0.025 %, preferably /= 0.020 %, manganese 15 to 25 %, chromium 10 to 15 %, nickel 0.25 %, molybdenum 1.0 to 1.3 %, nitrogen 0.30 to 0.50 %, silicon 1.0 %. The process of manufacture comprises the following stages: production of a starting ingot made of a steel as above; first homogeneous heating at a temperature above the recrystallisation temperature of the steel; rough forming of the rod by hot drawing of the ingot; first cooling to ambient temperature; second homogeneous heating; forming the rod by forging and dressing in the press; second cooling to ambient temperature; and lastly final machining. In this way it is possible to produce a cold-worked nonmagnetic steel rod of a length greater than 2.5 m exhibiting, over its whole length and homogeneously, an elastic limit, in the lengthwise direction, of at least 760 MPa in the case of finished products with diameters between 79 and 175 mm and of at least 690 MPa in the case of finished products with diameters between 178 and 254 mm, and an insensitivity to intergranular corrosion and to stress corrosion.
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