Patent ID: 8454765

Claim:
A component for use in oil field technology, wherein the component comprises a drilling string part and is made of a material which comprises an austenitic, substantially ferrite-free steel alloy comprising, in % by weight: from about 0% to about 0.35% of carbon; from about 0% to about 0.75% of silicon; from more than about 20.0% to about 30.0% of manganese; from more than about 17.0% to about 24.0% of chromium; an effective amount of molybdenum no higher than about 5.5% to achieve corrosion and pitting corrosion resistance; from about 0% to about 2.0% of tungsten; from 3.6% to about 15.0% of nickel; from about 0% to about 5.0% of cobalt; from 0.60% to about 1.05% of nitrogen; from about 0% to about 0.005% of boron; from about 0% to about 0.30% of sulfur; from about 0% to less than about 0.5% of copper; from about 0% to less than about 0.05% of aluminum; from about 0% to less than about 0.035% of phosphorus; and optionally one or more elements selected from vanadium, niobium and titanium in a total concentration of not more than about 0.85%, balance iron and production-related impurities, and wherein the drilling string part has a fatigue strength under reversed stresses at room temperature of greater than about 400 MPa at 10 7 load alternation.