Magnetisierbarkeit

die die Magnetisierbarkeit von Materie in einem externen Magnetfeld angibt

indicative of the magnetization of matter in an external magnetic field

magnetisierbarkeit

magnetisability

Magnetisierbarkeit der Partikel

magnetisability of the particles

Es war nun durchaus überraschend, daß bei einer Kaltverformung, welche oberhalb der Martensitbildungstemperatur durchgeführt wird, wo Spuren von Verforungsmartensit entstehen können, wodurch Magnetisierbarkeit bedingt ist, welche dadurch vermeidbar wird, daß die Kaltverformung bei einer Temperatur durchgeführt wird, welche oberhalb 100°C und unterhalb ca. 700°C und somit unterhalb einer Warmverformungstemperatur liegt, hohe Festigkeit erreicht werden kann und auch bei hohen magetischen Außenfeldern keine bleibende Magnetisierbarkeit vorliegt.

The alloy is melted and allowed to solidify and thereafter subjected to an at least two-stage, especially a four- to six-stage hot-working operation, i.e. an at least 2:1, especially 4-6:1 area reduction if desired, cooled down and then solution heat-treated at temperature of about 1,020 is subsequently quenched e.g. in water and subjected to a cold-working operation which substantially constitutes cold-working at a temperature above about 300 below the Curie point of iron, and further includes at least a 5%, preferably at least a 12% deformation. It has been found that in austenitic nonmagnetic low-carbon manganese-chromium steels of the type in question, magnetizable martensite can be formed by mechanical deformation at temperatures up to the range of 300 therefore, are particularly favorable in those regions of the drilling string components, particularly heavy-duty drill-stems, which are subject to localized peak deformation stresses, especially peak shear stresses during the cold-working operation.