Patent ID: 7708841
Filing Date: 2010-05-04
Classification: C21D,C22C

Abstract:
1. 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 from more than 1.90% to about 5.5% of molybdenum 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