stainless steel :

Stainless and acid resistant steel is called stainless steel for short. It 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 medium corrosion is called acid resistant steel. Generally speaking, steels with Cr content greater than 12% have 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 carbide stainless steel

Stainless steel is generally divided into:

1. Ferritic stainless steel. Chromium content 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.

2. Austenitic stainless steel. It contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance and resistance to corrosion of various media.

3. AUSTENITIC FERRITIC duplex stainless steel. It has the advantages of both austenitic and ferritic stainless steel, and has superplasticity.

4. Martensitic stainless steel. High strength, but poor plasticity and weldability.

Carbon steel

It mainly refers to the steel whose mechanical properties depend on the carbon content in the steel, and generally does not add a large amount of alloy elements. Sometimes it is also called plain carbon steel or carbon steel.

Carbon steel, also known as carbon steel, refers to iron carbon alloy with carbon content WC less than 2%.

In addition to carbon, carbon steel generally contains a small amount of silicon, manganese, sulfur and phosphorus.

According to the purpose, carbon steel can be divided into carbon structural steel, carbon tool steel and free cutting structural steel. Carbon structural steel can be divided into building structural steel and machine manufacturing structural steel;

According to the 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 boiling 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 (higher phosphorus and sulfur), high-quality carbon steel (lower phosphorus and sulfur), high-grade high-quality steel (lower phosphorus and sulfur) and special grade high-quality steel.

Generally, the higher the carbon content in carbon steel, the greater the hardness and strength, but the lower the plasticity.