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Stainless steel pipe according to the composition can be divided into Cr series (400 series), CR-Ni series (300 series), CR-Mn-Ni (200 series) and precipitation···
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Carbon steel, also known as carbon steel, is an iron-carbon alloy with a carbon content of ωc less than 2%.
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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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