Why do some stainless steel magnetic?

Today the industry, stainless steel scissors to make it the most common stainless steel rust, the key role of chromium in it.

        Stainless steel is often divided by organizational status: martensitic steels, ferritic steels, austenitic steels, austenitic - ferritic (duplex) stainless steel and precipitation hardening stainless steel. In addition, according to the ingredients into: chrome stainless steel, chrome-nickel stainless steel and chrome manganese nitrogen stainless steel.

        To make use of stainless steel scissors type martensitic stainless steel.

        Martensitic stainless steel: High strength, but poor ductility and weldability. Martensitic stainless steel grades are commonly 1Cr13,3Cr13 etc., due to higher carbon, it has a high strength, hardness and wear resistance, corrosion resistance, but somewhat less, the requirements for high mechanical properties, corrosion resistance general requirements on the part of some, such as springs, turbine blades, valves and other hydraulic press. Such steel is after quenching, tempering use. Forging, stamping required after annealing.

       Because scissors cut a functional item, you must have the sharpness, have sharpness must have a certain hardness. Such stainless steel must occur so that the internal organizational changes in order to increase the hardness by making scissors after heat treatment. But such internal stainless steel is tempered martensite, with permeability, can be attracted to a magnet.

       King has not suck austenitic stainless magnetism, its typical representative is 304 # stainless steel, stainless steel, but can not work in such heat treatment high strength, non-magnetic austenitic stainless steel can not get a higher heat treatment alternative strength, non-magnetic austenitic stainless steel body is not used to make knives, applies only to handle, knife blocks and so on. So we can not simply be explained by whether there is not a magnetic stainless steel.

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