304 VS 201 stainless steel manhole cover

I believe everyone is familiar with 304 stainless steel manhole covers. 304 stainless steel is very common in our daily life. It is possible that the thermos cup in your hand is made of 304 material. There are also 304 stainless steel manhole covers, so how about 304 stainless steel manhole covers? Which one is better with 201 stainless steel manhole covers?

stainless steel recessed manhole cover

201 stainless steel and 304 stainless steel are mainly different in composition. 304 stainless steel is better, but the price is more expensive. 201 stainless steel is not good as 304, but the price is cheaper. What are the main differences between the two? The following is a detailed introduction:

1. The chemical composition is different: Generally, stainless steel is based on iron and carbon with nickel, chromium, manganese and other metal elements to make it antirust. 304 stainless steel  manhole covers contain more nickel and chromium than 201 stainless steel manhole covers , Manganese element is less than 201 stainless steel manhole cover.

2. Physical properties: 304 decorative manhole cover has strong toughness, while 201 decorative manhole cover has insufficient toughness. The stretching process requires a lot of force and is easy to crack

3. Chemical properties: 201 composition is 17Cr-4.5Ni-6Mn-N, 304 composition is 18Cr-9Ni. Nickel-chromium metal mainly plays an anti-corrosion role. 304 stainless steel contains more nickel and chromium, and its corrosion resistance is stronger than that of 201 stainless steel. Therefore, 304 stainless steel decorative manhole covers are better in terms of corrosion resistance.

4. Price: 304 stainless steel  manhole covers contain more nickel and chromium, have good corrosion resistance, and are expensive. 201 stainless steel decorative manhole covers are relatively low in nickel and chromium, so the price of 201 stainless steel decorative manhole covers is low.

5. Safety performance: 201 decorative manhole cover contains high manganese elements, the appearance is very bright with dark bright, easy to rust. The safety of 304  manhole cover belongs to food-grade material. At present, the food-grade stainless steel is 304 stainless steel and above, which are used in food production equipment, chemical equipment and other places.

6. Scope of application: 304 stainless steel manhole covers have good corrosion resistance and are mostly used for outdoor buildings. 201 stainless steel manhole covers have good acid and alkali resistance and are mostly used for interior decoration.