用什么方法分辨304與316不銹鋼螺絲?

　　很多公司采購人員，因為自己公司有用到不銹鋼材質(zhì)的螺絲。有用到不銹鋼材質(zhì)為316和304的螺絲。但他們這時很想知道的就是怎樣去鑒別哪一個是不銹鋼304螺絲，哪一個是不銹鋼316螺絲。所以這時他們沒不太清楚的話，是很難去鑒別的。面對這樣的問題。

　　下面介紹一下不銹鋼304螺絲和不銹鋼316螺絲鑒別判斷的一些要點:

　　1.一般不銹鋼304螺絲表面有的有顯示A2,而不銹鋼316螺絲則顯示A4。不銹鋼螺絲國標和德標的印記通常用A2-70或A2-80來表示,A2--意思是奧氏體冷加工,材料為SUS304,70----抗拉強度為700MPa,80----抗拉強度為800MPa,還有A2-50表示的意和前者相同，A2、A3代表304.A4、A5代表316。

　　2.不銹鋼螺絲316比304多含MO，增加抗腐蝕性,耐酸堿性更好一些.

　　3.304-屬于A2 ，316屬于-A4.主要意思是抗拉強度不同:700/800.

　　4.從價格上區(qū)分，當然是不銹鋼螺絲316比304貴，大約都貴了60%左右。

　　5.當然，如果有科學的儀品去測試。

　　不銹鋼螺絲不管是304不銹鋼，還是316不銹鋼，還是302不銹鋼螺絲都難用肉眼分辨，因為不銹鋼螺絲的表面顏色幾乎是一樣的。不能將其分辨，有些人說用磁鐵可分出不銹鋼和碳鋼的區(qū)別，這種也是不靠譜的，不銹鋼螺絲在生產(chǎn)后其性能也會發(fā)生改變，原本無磁性的不銹鋼線材，在生產(chǎn)成螺絲后出會帶有磁性，而且這是生產(chǎn)無法避免的。

　　所以我們用肉眼或是簡單的磁鐵工具無法分辨出是否是不銹鋼螺絲， 我們在購買不銹鋼螺絲時，一定要選擇有實力有誠信的螺絲廠家進行采購。如果有必要，可以向廠家索用螺絲線材的檢測報告。

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　　What method is used to distinguish between 304 and 316 stainless steel screws?

　　Many company procurement staff, because their company uses stainless steel screws. Screws with stainless steel 316 and 304 are available. But what they want to know at this time is how to identify which one is stainless steel 304 screw and which one is stainless steel 316 screw. Therefore, if they are not very clear at this time, it is difficult to identify. Faced with such a problem.

　　Here are some key points for the identification of stainless steel 304 screws and stainless steel 316 screws:

　　1. Generally, some stainless steel 304 screws have A2 on the surface, while stainless steel 316 screws show A4. The mark of the national standard and the German standard of stainless steel screws is usually expressed by A2-70 or A2-80. The tensile strength is 800MPa, and the meaning of A2-50 is the same as the former. A2 and A3 represent 304. A4 and A5 represent 316.

　　2. Stainless steel screws 316 contain more MO than 304, increase corrosion resistance, better acid and alkali resistance.

　　3.304- belongs to A2, 316 belongs to -A4. The main meaning is that the tensile strength is different: 700/800.

　　4. In terms of price, stainless steel screws 316 are more expensive than 304, which are about 60% more expensive.

　　5. Of course, if there are scientific instruments to test. That would not be enough.

　　Stainless steel screws no matter whether they are 304 stainless steel, 316 stainless steel, or 302 stainless steel screws are difficult to distinguish with the naked eye, because the surface color of stainless steel screws is almost the same. It cannot be distinguished. Some people say that the difference between stainless steel and carbon steel can be distinguished by magnets. This is also unreliable. The performance of stainless steel screws will also change after production. The original non-magnetic stainless steel wire is The screw out will be magnetic, and this is inevitable in production.

　　Therefore, we can't tell whether it is stainless steel screws with naked eyes or simple magnet tools. When buying stainless steel screws, we must choose a screw manufacturer with strength and integrity to purchase. If necessary, you can request a test report of the screw wire from the manufacturer.