{"id":19994,"date":"2020-08-06T03:49:25","date_gmt":"2020-08-06T03:49:25","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=19994"},"modified":"2020-08-06T03:49:26","modified_gmt":"2020-08-06T03:49:26","slug":"how-to-distingguish-304-stainless-steel-and-202-stainless-steel","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/zh\/%e5%a6%82%e4%bd%95%e5%8c%ba%e5%88%86-304-%e4%b8%8d%e9%94%88%e9%92%a2%e5%92%8c-202-%e4%b8%8d%e9%94%88%e9%92%a2\/","title":{"rendered":"\u5982\u4f55\u533a\u5206304\u4e0d\u9508\u94a2\u548c202\u4e0d\u9508\u94a2\uff1f"},"content":{"rendered":"
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\u4ec0\u4e48\u662f\u4e0d\u9508\u94a2\uff1f<\/h2>\n\n\n\n

\u4e0d\u9508\u94a2\u662f\u4e00\u79cd\u94a2\uff0c\u542b\u78b3\uff08c\uff09\u5c0f\u4e8e2%\u7684\u79f0\u4e3a\u94a2\uff0c\u5927\u4e8e2%\u7684\u79f0\u4e3a\u94c1\u3002\u5728\u51b6\u70bc\u8fc7\u7a0b\u4e2d\u52a0\u5165\u94ec\uff08CR\uff09\u3001\u954d\uff08Ni\uff09\u3001\u9530\uff08MN\uff09\u3001\u7845\uff08SI\uff09\u3001\u949b\uff08TI\uff09\u3001\u94bc\uff08MO\uff09\u7b49\u5408\u91d1\u5143\u7d20\uff0c\u63d0\u9ad8\u4e86\u94a2\u7684\u6027\u80fd\uff0c\u4f7f\u94a2\u5177\u6709\u8010\u8150\u8680\u6027\uff08\u5373\u4e0d\u751f\u9508\uff09\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u5e38\u8bf4\u7684\u4e0d\u9508\u94a2\u3002<\/p>\n\n\n\n

\u4e3a\u4ec0\u4e48\u4e0d\u9508\u94a2\u6709\u4e0d\u540c\u7684\u7b49\u7ea7\uff1f<\/h2>\n\n\n\n

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\"\"<\/figure>\n\n\n\n

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\u4e0d\u9508\u94a2\u662f\u6ca1\u6709\u78c1\u6027\u7684\u5417\uff1f<\/h2>\n\n\n\n

 Is it good stainless steel without magnetism? If the microstrip is magnetized, isn’t it 304?<\/p>\n\n\n\n

Many customers go to the market to buy stainless steel. They bring a small magnet with them. When they look at the goods, they think that the stainless steel that can’t be sucked is good stainless steel. Without magnetism, there will be no rust. In fact, this is a wrong understanding. Stainless steel with or without magnetism is determined by the structure. During the solidification process of molten steel, due to the different solidification temperature, stainless steels with different structures such as “ferrite”, “austenite” and “mar tensite” will be formed. Among them, “ferrite” and “martensite” stainless steels are magnetic. However, only in terms of corrosion resistance, ferrite stainless steel with magnetic field is better than austenitic stainless steel. At present, the so-called 200 series and 300 series stainless steels with high manganese content and little nickel content in the market do not have magnetism, but their performance is far from that of 304 with high nickel content. On the contrary, 304 will be slightly magnetic after drawing, annealing, polishing, casting and other processes. Therefore, it is a misunderstanding and unscientific to judge the advantages and disadvantages of stainless steel by using stainless steel belt without magnetism.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u4e3a\u4ec0\u4e48\u4e0d\u9508\u94a2\u4f1a\u751f\u9508\uff1f<\/h2>\n\n\n\n

When there are brown rust spots (spots) on the surface of stainless steel, people are surprised: “stainless steel will not rust, rust is not stainless steel, maybe there is a problem with steel quality”. In fact, this is a one-sided wrong view of the lack of understanding of stainless steel. Stainless steel will rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation, that is, stainless steel has the ability of corrosion resistance in the medium containing acid, alkali and salt, namely corrosion resistance. However, the corrosion resistance of the steel varies with its chemical composition, mutual state, service condition and environmental medium type. For example, 304 material has absolutely excellent corrosion resistance in dry and clean atmosphere, but if it is moved to the coastal area, it will rust quickly in the sea fog containing a lot of salt. Therefore, not any kind of stainless steel, at any time can be resistant to corrosion, rust. Stainless steel is formed on its surface by a layer of extremely thin and firm and stable chromium rich oxide film (protective film), to prevent oxygen atoms from penetrating into and continuing to oxidize, and obtain the ability of corrosion resistance by numerical control. But for some reason, the film is constantly damaged, the air or liquid oxygen atoms will continue to penetrate or metal iron atoms will continue to separate out, forming loose iron oxide, the metal surface will be constantly corroded. There are many forms of destruction of the surface film.<\/p>\n\n\n\n

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\u4e0d\u9508\u94a2\u9508\u6591\u600e\u4e48\u5904\u7406\uff1f<\/h2>\n\n\n\n

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\"\"<\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"

What is stainless steel? Stainless steel is a kind of steel, which contains less than 2% carbon (c), which is called steel, and more than 2% is iron. The addition of chromium (CR), nickel (Ni), manganese (MN), silicon (SI), titanium (TI), molybdenum (MO) and other alloy elements in the smelting process improves the properties of…<\/p>","protected":false},"author":2,"featured_media":19995,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[79],"tags":[],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2020\/08\/1.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/posts\/19994"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/comments?post=19994"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/posts\/19994\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/media\/19995"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/media?parent=19994"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/categories?post=19994"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/zh\/wp-json\/wp\/v2\/tags?post=19994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}