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The hardest stainless steel is 440C stainless steel, is a kind of martensitic stainless steel, can do tools and the like, its hardness is 58 ~ HRC60.440 stainle···
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SUS631 Austenitic precipitation-hardened stainless steel is a semi-austenitic precipitation-hardened stainless steel by adding the element aluminum.
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In addition, if the quality of zinc liquid deteriorates, the iron content in zinc liquid increases, and the pure zinc layer on the surface of galvanized is gray···
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And rust prevention oil should also be selected properly, so as to effectively extend the service life of the steel plate.
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