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Non-magnetic stainless steel, a manganese - chromium resistant to corrosion under stress, the production of a non-magnetic steel bar of great length.
Non-magnetic stainless steel, a manganese - chromium resistant to corrosion under stress, the production of a non-magnetic steel bar of great length.
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机译:非磁性不锈钢,锰-铬在压力下具有耐腐蚀性能,可生产出长度很大的非磁性钢筋。
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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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