In the eyes of many consumers, 304 stainless steel and 201 stainless steel is almost no difference, almost indistinguishable from the naked eye, here to introduce some ways to distinguish between 304 and 201.

1、规格：常用的不锈钢板材分为201和304两种型号，实际是是成分不同，304质量好一些，但价格贵，201差一些。304为进口不锈钢板,201为国产不锈钢板。

1, specifications: commonly used stainless steel sheet is divided into 201 and 304 two models, the actual composition is different, 304 quality is better, but the price is expensive, 201 poor. 304 for imported stainless steel plate, 201 for domestic stainless steel plate.

2、201组成为17Cr-4.5Ni-6Mn-N，是节Ni钢种，301钢的替代钢。经冷加工后具有磁性，用于铁路车辆。

The composition of 2 and 201 is 17Cr-4.5Ni-6Mn-N, which is the Ni steel and the substitute steel of 301 steel. It is magnetic after cold working and used in railway vehicles.

3、304组成为18Cr-9Ni，是得到最广泛应用的不锈钢、耐热钢。用于食品生产设备、昔通化工设备、核能等。

3 and 304 are 18Cr-9Ni, which are the most widely used stainless steel and heat resistant steel. Used in food production equipment, chemical equipment, nuclear energy and so on.

4、201是含锰较高,表面很亮带有暗黑的亮,含锰较高容易生锈。304含铬较多,表面呈现哑光,不生锈.两种放在一起就有比较了。最重要的就是耐腐蚀性能不同,201的耐腐蚀性能很差,所以价格就要便宜很多.又因为201含镍低，所以价格比304的低，于是耐腐蚀性能就不如304的了。

4, 201 is manganese content is higher, the surface is bright, with dark bright, manganese content is higher, easy to rust. 304 chromium more surface is matte, not rust. Two together with the comparison. The most important thing is that the corrosion resistance is different, 201 of the corrosion resistance is very poor, so the price will be much cheaper. And because of the 201 nickel containing low, so the price is lower than 304, so the corrosion resistance is not as good as 304.

5、201与304之间的区别就是含镍的问题。而且304的价格现在都比较贵，但304的话起码可以保证在使用过程中不会生锈。（可用不锈钢药水做实验）

The difference between 5, 201 and 304 is the problem of nickel. And 304 of the price is now more expensive, but 304 of the words at least can guarantee the use of the process will not rust. (experiments with stainless steel potions)

6、不锈钢不易生锈是因为在钢体表面形成富铬氧化物可保护钢体,201料属于高锰不锈钢较304硬度大，高碳低镍.

6, stainless steel does not rust because the formation of chromium oxide on the steel surface can protect the steel body, 201 materials belonging to the high manganese stainless steel with 304 high hardness, high carbon low nickel.

7、成分不同(主要从含碳，含锰，含镍，含铬几方面来区分201与304的不锈钢)

7, different ingredients (mainly from carbon, manganese, nickel, chromium, to distinguish 201 and 304 of stainless steel)

钢号 碳(C) 硅(Si) 锰(Mn) 磷(P) 硫(S) 铬(Cr) 镍(Ni) 钼(Mo) 铜(Cu)

Carbon steel (C) silicon (Si) Mn (Mn) and phosphorus (P) and sulfur (S) chromium (Cr) nickel (Ni) molybdenum (Mo) copper (Cu)

AISI(304) ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.03 18-20 8-10

AISI (304) = 0.08 = 1 = 2 = 0.045 = 0.03 18-20 8-10

AISI(201) ≤0.15 ≤1.00 5.5-7.5 ≤0.05 ≤0.03 16-18 3.5-5.5

AISI (201) = 0.15 = 1 = 0.05 = 0.03 5.5-7.5 16-18 3.5-5.5