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Non-magnetic drill collar is to use a kind of low carbon high chromium manganese alloy steel, it is after strict ratio of the chemical composition of refined and achieved through forging and its mechanical properties, good mechanical properties of low permeability, high strength, excellent intergranular corrosion cracking resistance and excellent wear resistance.When the magnetic field strength 1 x 105/4 PI for A/m, non-magnetic drill collar relative magnetic permeability of u r 1.010 or less.
Non-magnetic drill collar along the inner hole any 100 mm away from the magnetic induction intensity gradient 0.05 mu T or less.
Non-magnetic stainless steel with special qualities that the lines of magnetic force can through, thus has important applications in some microwave devices, its under the pulse magnetic field produced by the eddy current loss relative to copper or other metal is smaller, this is because the non-magnetic stainless steel conductivity than copper.
Above the chromium content in steel is greater than 12.5%, has the high resistance to the outside world medium (acid), alkali, salt corrosion of steel, called stainless steel.According to the organization of the situation in the steel, stainless steel can be divided into martensite shape, iron grain size, austenite and ferrite, austenite size, precipitation hardening stainless steel, according to the national standard GB32 80-92, a total of 55.In everyday life we contact more austenite size stainless steel (some call it nickel stainless) and martensite stainless steel (some call it stainless iron, but not science, easily misunderstood, should be avoided) two kinds big.Austenite stainless steel typical size grades of 0 cr18ni9, namely "304" and 1 cr18ni9ti.Martensite stainless steel is our manufacturing knife cut size of stainless steel, brand mainly has 2 cr13 and 3 cr13, 6 cr13, 7 cr17, etc.Because of the difference of these two kinds of stainless steel group composition, make them with metal microstructure is not the same.Austenite stainless steel size because of the high chromium and nickel in steels (chromium at about 18%, Ni in more than 4%), steel internal organization of a state called austenitic organization, this organization has no magnetic conductivity, not attracted by magnet.Commonly used for decorative materials, such as stainless steel pipe, towel rack, tableware, furnace, etc.Make knife cut class stainless steel should use markov shape stainless steel.Because the knife cut has the function of shear items must have the sharpness, must have the sharpness must have a certain hardness.This kind of stainless steel must be internal organization change by heat treatment.Increase the hardness to be knife cut.But this kind of stainless steel internal organization for tempering martensite, with magnetic conductivity, can be attracted to the magnet.So whether magnetic cannot simply be used to mean "stainless steel
