What are the main differences between stainless steel pipes and carbon steel pipes?

Carbon steel seamless pipes are often called carbon structural steel. Iron, carbon and manganese are the main elements. Except for C, no other alloying elements are included. It is mainly divided into 10# seamless steel pipe, 20# seamless steel pipe, 45# seamless steel pipe. Of course, C also has a certain control, and the hardness is greater than pure iron. Carbon steel has low cost, is easy to rust, has a short service life, and is used for various structures and pipelines that do not have any corrosion resistance.

Stainless steel pipe refers to alloy steel containing Cr ≤ 13% and is not in the atmosphere. There are many types of stainless steel, such as ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, etc. Different stainless steels have different corrosion resistance and different corrosion resistance to different media. It also differs in magnetism. Carbon steel is magnetic, while stainless steel is generally not magnetic or magnetic.

Stainless steel pipes contain a large amount of chromium, and some also contain a large amount of nickel and a certain amount of titanium. The role of chromium is to make steel corrosion-resistant. Nickel is the main alloying element in the formation of austenitic stainless steel, but only in combination with chromium can the role of nickel be fully exerted. If pure nickel is used, low-carbon nickel steel requires pure austenite single-phase structure, and the nickel content needs to be above 24%. In fact, when the nickel content needs to reach 27%, the corrosion resistance of stainless steel pipes is significantly improved. , so there is no nickel as an alloying element in stainless steel pipes.

Common stainless steels are mostly austenitic stainless steels, such as 304, 316L, 321, etc. The carbon content is low, but the alloying element content is above 20%, including chromium 18-20%, Ni content 8-10%, and vanadium, molybdenum, titanium and other elements. Stainless steel is used for corrosive. In the medium, especially in the food, medicine, daily chemical cosmetics and other industries with high requirements for environmental conditions, most of them are used. Of course, the chemical industry is also widely used. However, austenitic stainless steel is afraid of chloride ions, and the chloride ion control of water in the environment is very strict.

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