Steel product is the indispensable important materials for national construction and the four modernizations, steel is generally classified into section, plank, pipe and metal products according to the different shape of cross section, it is various and widely used,. The raw material of steel product is steel ingot or steel billet, process them into various shapes, sizes and properties by the pressure. Most of the steel processing are steel through the pressure processing, make the processed steel (ingot or billet) plastic deformation. According to different steel processing temperature, steel product can be divided into cold and hot working two kinds. Steel product is also divided into many specific types in order to facilitate steel production organizing, supply and improve the management work, such as heavy rail, light rail, large formed steel, medium formed steel, small formed steel, cold-formed steel, high quality steel, medium thickness plate, sheet steel, electrician silicon steel, strip steel, seamless steel tube welding, steel pipe, metal products, and other varieties.
According to the use of steel it can be divided into structural steel, stool steel, special steel and professional steel. Structural steel can be divided into two kinds, construction steel is used for buildings, bridges, ships, boiler or other structure parts. Common construction steel are carbon structural steel and low alloy steel, reba and so on. Steel product used for steel parts of manufacturing machine structure is called machinery manufacturing structural steel. This kind of steel is basically all high quality steel or quality steel, mainly high quality carbon steel, alloy steel, easy cutting structural steel, spring steel, rolling bearing steel and so on. Tool steel is commonly used for manufacturing all kinds of tools, such as carbon steel, alloy steel, high speed steel, etc. According to use the tool steel can be divided into die steel, cutting tool steel and measuring tool steel. Special steel is the steel with special performance, such as stainless steel, heat-resistant not peeling acid steel, high resistance alloy, wear-resisting steel, magnets steel and so on. Professional steel such as automotive steel, aviation steel, agricultural machinery steel, chemical machinery steel, boiler steel, welding rod and so on is steel product for professional industrial department using.
Steel can be divided into ordinary steel, quality steel plate and high quality steel if classification basisi is the quality. In ordinary steel the impurity element is more, sulphur content is generally less than 0.05%, phosphorus content is less than 0.045%, such as carbon structural steel and low alloy steel and so on. Quality steel with less impurity element, sulfur and phosphorus content are generally less than 0.04%, such as high quality carbon steel, alloy steel, carbon steel and alloy steel, spring steel, bearing steel and so on. High quality steel contains few impurities element, sulphur content is generally less than 0.03%, and phosphorus content is less than 0.035%, such as structural alloy steel and so on. High quality steel usually adds symbols “A” or Chinese character “high” behind the steel grade for identification.
We will introduce the Alloy Steel Plate in the next article.