Currently, most of the stainless steel water bottles sold in the United States, Canada, Europe, and Japan are made of 304 stainless steel and 201 stainless steel. Here,304 stainless steel is also what we called 18/8 stainless steel. Consumers often write emails asking us, what is the difference between 304 stainless steel and 201 stainless steel? What is the difference impact in health and environmental? We will give a detailed explanation in this article
To answer this question, firstly, we have to understand the nature of stainless steel, as well as how to definite the classification and name of stainless steel materials. Stainless steel is a metal alloy. The invention of stainless steel that not easy to rust is a major break through world metallurgical history. At the beginning of the 20th century from 1907 to 1930 , based on the role of chromium in steel and the role and influence of nickel and other elements, metallurgists successively invented martensitic stainless steel with 12 to 13% Gr and 14 to 16% Gr/0.07. ~0.15%C ferritic stainless steel, German Maurer and Strauss invented austenitic stainless steel containing 1.0%C/15~20%Gr/<20%Ni, and then in 1929 Strauss won the famous 18/8 [18%Gr, 8%Ni] stainless steel patents. So far, there are more than 200 types of stainless steel materials used. They have achieved wide and meaningful different roles in the practical application of metal materials. The overall practical application of stainless steel The value is that it is not easy to rust and corrosion resistance. In the atmosphere and weak corrosive media, where the corrosion rate is less than 0.01mm/a, it is considered “corrosion resistant”, and vice versa. In addition to the core role of corrosion resistance from the perspective of use, acid-resistant stainless steel, heat-resistant (high-temperature) stainless steel, and low-temperature stainless steel have been subsequently developed.
From the above development of stainless steel, we know that stainless steel is a general term for a kind of metal alloy that is not easy to rust, and there are more than 200 kinds of them. In order to distinguish each of them, we have to name them and express them. Anyway, we cannot write them in molecular formulas. Which is very difficult to recognize. Stainless steel grades are one of the main ways of expressing stainless steel. However, due to differences in history, language and culture, the development of metallurgical industry and the application of stainless steel in major countries in the world, the expressing method of stainless steel grades is also different.
The United States, Germany, China, Russia, and Japan have their own methods to name various stainless steels.
The three-digit numbers 201 and 304 which we often say are actually the American representation method1: AISI standard steel number representation method, the first digit indicates the type of steel, the other two digits indicate the serial number, 2**: chromium manganese nickel Nitrogen austenitic steel; 3**: nickel-chromium austenitic steel, ** is the omitted serial number, such as 202 and 301 specific numbers are omitted here; in addition, 2: SEA standard uses 5 digits to represent steel No., such as 30408, 30403, 60316, etc., 3: ACI standard steel number representation method (omitted), 4: UNS system steel number representation method (omitted).
Here, we briefly mentioned the Japanese stainless steel grade representation method which we often be asked. The Japanese standard is basically referring to AISI of the United States, but adding the prefix “SUS” means stainless steel, and adding “SUH” means heat-resistant steel, such as SUS304. means stainless steel 304.
Well, believing you have already understood the origin of the name [brand] of stainless steel through above explanation .This is very important for everyone to understand all kinds of stainless steel. Knowing the ins and outs, we can better understand various stainless steels and the characteristics of various stainless steels. The difference is simpler and logical and systematic. In fact, we can easily find various common stainless steel entries by Google in which the properties and uses of different grades of stainless steel are described in detail. You can take time to learn and compare the characteristics of various stainless steels if you are interested
304 stainless steel [0Gr18Ni9] and 201 stainless steel [1Cr17Mn6Ni5N]are two stainless steel materials named according to the American AISI standard, and are also widely used in many industries around the world. It should be noted that stainless steel is difficult to just looking at it. It is inevitable to make mistakes that even very experienced practitioners can tell the difference through visual observation. 304 and 201 are two austenitic stainless steel, solid solution treated 304 stainless steel, 201 stainless steel are non-magnetic, and the magnetic is due to the internal structure damage caused by cold working or the formation of a small amount of ferrite structure; 304 is a stainless steel type The most famous and most widely used type of stainless steel is the 8 nickel 18 chromium stainless steel that we often say. From the perspective of application, 304 is the most common, cost-effective, and most versatile stainless steel material. The quantity and scope of application are ranked first in the world.