What is the difference between carbon steel pipe and stainless steel pipe?
Carbon steel pipe can also be called carbon steel pipe, such as common Q195 and Q235 Carbon steel, also known as magnet alloy steel, has no other metal elements except carbon and iron. Stainless steel is chromium nickel steel. In addition to carbon and iron, there are other metal elements such as chromium, nickel and copper. When the chromium content in the steel pipe exceeds 12.5%, a protective film (passive film) will be formed on the surface of the steel pipe, so as to achieve the effect of corrosion resistance. Therefore, the main difference between the two is that in terms of corrosion resistance, carbon steel pipe is easy to rust, while stainless steel pipe is corrosion-resistant steel.
Now there is a great demand for stainless steel pipe in the market because of its corrosion resistance and environmental protection. But many people easily confuse stainless steel pipe with carbon steel pipe. Today, let's talk about the difference between the two.
1. The manufacturing process of carbon steel pipe is different from that of stainless steel pipe
The steel pipe made of a whole piece of metal without joints on the surface is called seamless steel pipe.
Carbon steel pipe is made of steel ingot or solid round steel through perforation, and then hot rolled, cold rolled or cold drawn.
Stainless steel pipe can be divided into equal section pipe and variable section pipe according to the profile shape. Variable section pipes include conical pipes, stepped pipes and periodic section pipes.
2. Carbon steel pipe and stainless steel pipe have different applications
Seamless steel pipe is mainly used as petroleum geological drilling pipe, cracking pipe for petrochemical industry, boiler pipe, bearing pipe and high-precision structural steel pipe for automobile, tractor and aviation.
Carbon steel pipe: carbon steel pipe plays an important role in China's steel pipe industry. The raw material of carbon steel pipe is round tube blank. The round tube blank is cut and processed by the cutter, and the blank with a growth of about 1m is sent to the furnace for heating through the conveyor belt. The billet is sent to the furnace for heating at a temperature of about 1200 degrees Celsius.
Stainless steel pipe: it is mainly used in industrial transmission pipelines and mechanical structural parts such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instruments, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture, kitchenware, etc.
Stainless steel pipes have higher hardness and better corrosion resistance, mainly because some rare metals are added, such as manganese, etc. in this way, stainless steel pipes are not only beautiful, clean, but also durable. The only disadvantage is that the price is higher!
3. Carbon steel pipe and stainless steel pipe have different functions
Seamless steel pipe is widely used. General purpose seamless steel pipe is rolled by ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output. It is mainly used as pipeline or structural parts for conveying fluid.
Hot rolled carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes
Stainless steel pipes are divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, bimetallic composite pipes, coated and coated pipes to save precious metals and meet special requirements.
4. Carbon steel pipe and stainless steel pipe have different properties
Carbon steel pipe: it is made of steel ingot or solid round steel through perforation, and then hot rolled, cold rolled or cold drawn.
Stainless steel pipe: it is a kind of hollow long round steel.
Seamless steel pipe: a steel pipe made of a whole piece of metal without joints on the surface.
5. Carbon steel pipe and stainless steel pipe have different characteristics
Carbon steel pipe: carbon steel pipe is divided into hot rolled steel pipe and cold rolled (drawn) steel pipe. Hot rolled carbon steel pipe is divided into general steel pipe, low and medium pressure boiler steel pipe, high pressure boiler steel pipe, alloy steel pipe, stainless steel pipe, petroleum cracking pipe, geological steel pipe and other steel pipes.
Stainless steel pipe: among the stainless steel pipe standards, Brinell hardness is the most widely used. The hardness of the material is often expressed by indentation diameter, which is intuitive and convenient. However, it is not applicable to steel pipes with hard or thin steel.
Seamless steel pipe: according to the production method, seamless pipe is divided into hot-rolled pipe, cold-rolled pipe, cold drawn pipe, extruded pipe, pipe jacking, etc. According to the section shape, seamless steel pipes are divided into circular and special-shaped pipes. Special-shaped pipes have a variety of complex shapes such as square, oval, triangular, hexagonal, melon seed, star and winged pipes. The maximum diameter is 650mm and the minimum diameter is 0.3mm.
Through the above analysis, I believe you have a certain understanding of carbon steel pipe and stainless steel. A certain amount of knowledge will help you make the wisest decisions.