Difference between AISI 304 and AISI 316 grades

Stainless Steel AISI-304 (EN 1.4301) Grade:

is resistant to corrosion under normal atmospheric conditions. It contains nickel (8-10.5%) and chromium (18-20%).

Advantages:

Stainless steel railings made of AISI-304 grade: low cost, wide range of railing elements, and modern appearance.

Disadvantages:

Stainless steel railings made of AISI-304 grade have lower acid resistance. When used outdoors, due to various acids present in atmospheric precipitation, there is a risk of oxidation stains appearing on the metal. It is not recommended to use this type of stainless steel railings in areas with high salinity (coastal zones) or where they may come into contact with various acids (such as in swimming pools). However, our stainless steel railings can be easily protected from corrosion using inexpensive and easily accessible protective treatments.

Stainless Steel Railings - AISI-316 (EN 1.4401) Grade:

are made of acid-resistant steel, which has increased corrosion resistance. Ideal for railings that will be used outdoors or in aggressive environments. This grade of stainless steel contains a higher amount of chromium (17-20%) and nickel (8-14%), as well as alloying elements such as molybdenum (2-3%). The main difference between 304 and 316 stainless steel is their chemical composition: 316 contains a higher amount of molybdenum, usually between 2-3%. The higher molybdenum content provides increased corrosion resistance in grade 316.

Advantages:

Stainless steel railings made of acid-resistant AISI-316 steel can be used in industrial areas, near busy roads, and in large cities where exhaust gases containing sulfur dioxide are present. Acid-resistant stainless steel railings can also be used in coastal zones. Additionally, they are suitable for locations where there is a risk of contact with various acids. Other advantages of stainless steel railings are, without a doubt, their modern appearance.

Disadvantages:

Stainless steel railings made of AISI-316 acid-resistant steel are available at a relatively high price. Another drawback is the lower availability of railing elements, as not all components are made from this steel grade.