笼统的讲，不锈钢的抗方腐蚀性和含镍有关，镍含量越高，抗腐蚀性越好（但也不是绝对）。

Generally speaking, the square corrosion resistance of stainless steel is related to the nickel content. The higher the nickel content, the better the corrosion resistance (but not absolute).

食品工厂与食物接触的不锈钢多为304,含镍在8%以上，要求高的个别器具会用316L（含镍12%以上，医疗用手术刀就是）。

The stainless steel that contacts with the food of the food factory is mostly 304, containing nickel in more than 8%, and the individual appliances with high requirements will use 316L (containing nickel in more than 12%, the medical scalpel is).

带不带磁不能完全证明不锈钢的镍的情况及其牌号。

With or without magnetic can not fully prove the case of stainless steel nickel and its brand.

含磁与钢材熔炼时的加工处理有关（热溶后退火或淬火等工艺处理不同，分子的排列发生变化）。

The magnetic process is related to the processing of steel smelting (the arrangement of molecules changes in the process of hot dissolution or quenching).

我过去一直认为可以以这个来判定不锈钢，后来到了食品机械加工行业后才发现，不锈钢的牌号非常多，各个国家和地区的标准也不尽相同，有日本标准、美国标准、德国标准、中国标准等等，经常说的201、304等用数字表示牌号的多为日标或美标（而同样是316L，日标和美标也不一样，一个要求含镍12%，一个要求10%）各个牌号除了含镍这个因素外，还和加工等工艺因素有关。

I used to think this was the way to judge stainless steel, but I found out when I was in the food machining industry,there are so many brands of stainless steel, and the standards of various countries and regions are not the same, Japanese standards, American standards, Germany, Chinese standards, etc., we often say the 201,304 and other numbers,more for the Japanese or American standard (And the same 316L, the Japanese standard  and the US standard are also different,one requires 12% nickel, one requires 10%) each brand in addition to the nickel contains this factor, also related to process factors such as processing.

一般的餐具是舍不得用304的，新的餐具上有铭牌，你看一下它所执行的标准就可以知道具体是什么材质的了。

General tableware is reluctant to use 304, there is nameplate on new tableware,if you look at the standard it performs, you can see what the material is.

我曾留心过一些餐具的铭牌，发现它们的材质也是良莠不齐，但基本没有304材质的。

I have paid attention to the nameplates of some tableware and found that their materials is mixed good and bad, but basically no 304 material.

不锈钢不代表永远不会生锈。

Stainless steel does not mean that it will never rust.

它一般不怕酸，主要是怕氯离子，即含盐的食物（酱油厂用316L材质的不锈钢用久了都会腐蚀）。

It is generally not afraid of acid, mainly afraid of chloride ions, that is, salty food (The 316L stainless steel used in the soy sauce factory will also corrode after used for a long time).

我家里有一个含镍低的不锈钢小碗被经常来加热卤味就腐蚀变黑了。

I have a small stainless steel bowl with low nickel in my home that is often heated Taiwanese braised dish and become black by corrosion .

不用担心这些问题，即使你用铁家伙也不存在人体危害的问题。

Don't worry about these problems, even if you use iron products,It will not do harm to human body.

与食物接触的金属器具一般只要不是铝或铜及其它重金属就没什么事。

Metal appliances that have contact with food generally do nothing as long as they are not aluminum or copper and other heavy metals.