Boiling steel plate and calm steel plate
Boiling steel plate is a kind of steel plate that is heated to and maintains a high temperature. It is mainly used for structural parts and is widely used in various industries, such as ships, bridges, pressure vessels, automobiles, containers, etc. Calm steel plate has better mechanical properties and formability than boiling steel plate. It is mainly used for low-temperature pressure vessels, bridges, power stations and other structures requiring strong construction performance.
Boiling steel plate refers to an iron and steel material which has been heated to a temperature close to its melting point and then quench-hardened (sometimes called hot hardened). Under normal circumstances, this temperature ranges from 850℃ to 1100℃ and requires some changes in the chemical composition of the iron and steel material. Boiling steel plate has good plasticity, toughness and weldability, but its strength and hardness are higher than that of others. The surface of boiling steel plate is usually black and easily painted. When exposed to air and acid, alkali and salt, it is prone to corrode and oxidize, so generally it is coated with anti-rust paint. Its application range is very wide, and it is mainly used in ships, boilers, petroleum storage tanks, pressure vessels and other materials.
Calm steel plate is a kind of steel plate which is treated by low temperature tempering or tempering after quenching. The mechanical properties of calm steel plate are better than those of boiling steel plate, and its formability is also better. Calm steel plate is mainly used for low-temperature pressure vessels, bridges, power stations and other structures requiring strong construction performance. The chemical composition of calm steel plate is basically the same as boiling steel plate, but its quenching temperature and tempering temperature are different. Low temperature tempering is usually done at a temperature of 200℃, while high temperature tempering is generally done at a temperature of 500℃. In addition, it has higher requirements for the fine grains of its surface.
From the current market point of view, boiling steel plate and cold-rolled steel plate coexist in the steel market. This is mainly because boiling steel plate and cold-rolled steel plate have their own advantages. Boiling steel plate has higher strength and hardness than cold-rolled steel plate, but its toughness and plasticity are not as good as that of cold-rolled steel plate. Boiling steel plate is mainly used in the shipbuilding and automobile industry, while cold-rolled steel plate is mainly used in the bridge industry and pressure vessel industry.
