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What's the Difference Between the Common Stainless Steels in Life?

Feb. 25, 2020

304, 304L, 316, 316L, these are called the "brands" of stainless steel. Different grades of stainless steel have different proportions of the substances contained in them-the metal properties are also different. I want to answer the question in two parts: the difference between "L" and "L" in the grade; the difference between 304 and 316. The following 304l Stainless Steel Sheet Supplier will introduce to you in detail.


"L" in grades:

First we have to briefly understand a term called "intergranular corrosion". Refers to the precipitation of carbides during the high temperature welding of metals. After the precipitation of carbides, it will affect the stability of the welding-more terrible is that after the intergranular corrosion can not be distinguished from the appearance. In other words, after welding of common metals, the welding may not be strong due to the presence of intergranular corrosion. And this kind of instability can only be seen after the welding force is broken due to external forces-after the break, it is too late! In order to prevent the occurrence of intergranular corrosion, we must process the ordinary metal-that is, reduce the content of carbides in the metal. With less content, naturally it is not easy to be precipitated by heat. This metal with reduced carbide content will be added with an "L" after the grade-304L, which is the product of 304 stainless steel after reducing carbides, except that it can prevent intergranular corrosion, and its performance is the same as 304; the same alsp. After reducing the carbide, the metal is more resistant to high temperatures. Not only the metal used in some ultra-high temperature environments when welding, but also the "L", such as 304l Stainless Steel Plate.


304l Stainless Steel Plate


304l Stainless Steel Plate


The difference between 304 and 316:

The "stainless steel" in our colloquial name is called "stainless acid-resistant steel"-it is not only rust-resistant, but also resistant to acid and alkali corrosion. All stainless steels can not rust, but have different resistance to corrosion and mechanical strength-according to this ability, they are divided into different grades, 304 and 316 are two of them.


The corrosion resistance of 304 is already very strong. It is hard to find anything in daily life. Because of this, 304 stainless steel has been nationally designated as "food-grade stainless steel". The corrosion resistance of 316 is even stronger. In addition to oil, salt, sauce, vinegar and tea, it can resist a variety of strong acids and alkalis. Not only that, 316 stainless steel has lower environmental requirements-too high or too low temperature does not affect the corrosion resistance of 316 stainless steel. Common products are 316 Stainless Steel Sheet.

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