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    • 4. 发明专利
    • DE3681641D1
    • 1991-10-31
    • DE3681641
    • 1986-06-19
    • SCHOELLER BLECKMANN STAHLWERKE
    • KOHL HEINZPOHL HELMUTPUECHL ALOIS
    • E21B17/00C21D8/00C22C38/00C22C38/38C22C38/58C21D8/06
    • For producing non-magnetic drilling rods, in particular heavy rods for exploration drillings, for example for oil and/or natural gas deposits, such as directional drillings or the like, an alloy of, in % by weight,… carbon max. 0.15, preferably max. 0.08… silicon max. 1.0… manganese 11.0 to 25.0, preferably 12.0 to 20.0… chromium 10.0 to 20.0, preferably 11.0 to 16.0… molybdenum up to 1.0, preferably 0.2 to 0.8… nickel up to 6.0, preferably 1.0 to 2.5… niobium/tantalum up to 2.0, preferably 0.4 to 0.8… nitrogen 0.05 to 0.5, preferably 0.1 to 0.35… the remainder being iron and impurities and, if appropriate, one or more of the following elements vanadium, boron and aluminium, is allowed to solidify, subjected to at least two, especially four to six hot deformations, cooled down if desired and then solution-annealed at 1020 to 1070 DEG C, subsequently quenched, for example in water, and subjected to cold-forming, which is carried out at a temperature above room temperature, especially above 100 DEG C and below about 700 DEG C, in particular at the temperature of the Curie point of iron and with an at least 5 % and preferably at least 12 % deformation.