Difference between stainless steel and carbon steel
Stainless acid resistant steel is referred to as stainless steel, which is composed of stainless steel and acid resistant steel. In short, the steel that can resist atmospheric corrosion is called stainless steel, and the steel that can resist chemical corrosion is called acid resistant steel. Generally speaking, the steel containing more than 12% WCR has the characteristics of stainless steel.
According to the microstructure after heat treatment, stainless steel can be divided into five categories: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, austenitic ferritic stainless steel and precipitated carbon stainless steel.
Stainless steel is usually divided into three types according to the matrix structure
- Ferritic stainless steel. The chromium content is 12% – 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other kinds of stainless steel.
- Austenitic stainless steel. It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of various media.
- Austenitic ferrite duplex stainless steel. It has the advantages of both austenitic and ferritic stainless steels and superplasticity.
- Martensitic stainless steel. High strength, but poor plasticity and weldability. Carbon steel mainly refers to the steel whose mechanical properties depend on the carbon content in the steel, and generally does not add a lot of alloy elements, sometimes also known as plain carbon steel or carbon steel.
Carbon steel refers to the carbon content of WC less than 2% of the iron carbon alloy. In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus.
Carbon steel can be divided into three types: carbon structural steel, carbon tool steel and free cutting structural steel;
According to smelting method, it can be divided into open hearth steel, converter steel and electric furnace steel;
According to deoxidation method, it can be divided into rimming steel (f), killed steel (z), semi killed steel (b) and special killed steel (TZ);
According to the carbon content, carbon steel can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC 0.25% – 0.6%) and high carbon steel (WC > 0.6%);
According to the content of phosphorus and sulfur, carbon steel can be divided into ordinary carbon steel (with high phosphorus and sulfur content), high-quality carbon steel (with low phosphorus and sulfur content), high-grade high-quality steel (with lower phosphorus and sulfur content) and special grade high-quality steel. Generally, the higher the carbon content in carbon steel, the greater the hardness, the higher the strength, but the lower plasticity.
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