Steel all kinds of classification is introduced

Web Design And Seo For www.china-webdesign.com

tool bearings - China Manufacturer

Thank you for inquiry my tool bearings, Tel : 0086-0379-64390888, E-mail: liuping@lyzyc.cc

http://www.lyzycbearing.com/key-tool-bearings-26/

Steel is iron, carbon as the main component of the alloy, its carbon content generally less than 2.11%. Steel is economic construction is very important in the metal materials. According to the chemical composition of steel can be divided into carbon steel (hereinafter r eferred to as carbon steel) and two kinds of alloy steel. Carbon steel is obtained by iron smelting alloy, in addition to iron, carbon as its main ingredients outside, still contain a small amount of manganese and silicon, sulfur, phosphorus and impurity. Carbon steel has certain mechanical properties, and have good process performance, and the price cheap. Therefore, carbon steel for a wide range of application. But along with the development of modern industry and the rapid development of science and technology, the performance of the carbon steel have been unable to fully meet the demand, so people developed all kinds of alloy steel. Alloy steel is in carbon steel basis, have the destination to join some elements (called alloy element) and get multiple alloy. And than carbon steel, alloy steel performance has improved significantly, it has been used more and more widely.sealed roller bearing
Due to the variety of steel, to facilitate the production, storage, selection and research, it is necessary to steel classified. According to the steel use, chemical composition, quality of different, can be divided into many steel class:
(a). Functional classification
According to the purpose of the steel can be divided into structural steel, tool steel, special steel performance of three categories.
1. Structural steel:
(1) used for all kinds of machine parts of steel. It includes carburizing steel, hardened and tempered steel, spring steel and rolling bearing steel.
(2) used as engineering structure steel. It includes the carbon steel a and b, special kind of steel and ordinary low alloy steel.
2. Tool steel: used to produce all kinds of tool steel. According to use a different tool can be divided into cutlery steel and die steel and measuring tool steel.
3. Special performance steel: is it have special physical and chemical properties of th e steel. Can be divided into the stainless steel, heat-resistant steel, wear-resistant steel, steel, etc.
(2). According to the chemical composition classificationbearing suppliers
According to the chemical composition of the steel can be divided into carbon steel and alloy steel two kinds big.
Carbon steel: according to carbon content and can be divided into low carbon steel (carbon content of 0.25% or less); Medium carbon steel (0.25% carbon content < < 0.6%); High carbon steel (carbon content was 0.6%).
Alloy steel: according to alloy element content and can be divided into low alloy steel (alloying element total content of 5% or less); Medium alloy steel (alloying element total content = 5% - 10%); High alloy steel (alloying element total content > 10%). In addition, according to the steel main alloy elements contained in different kinds, also can be divided into manganese stee l, chrome steel, nickel chromium steel, chromium manganese titanium steel, etc.stainless steel ball bearings
(3). In accordance with the quality classification
According to the steel harmful impurity phosphorus and sulfur content can be divided into ordinary steel (0.045% or less phosphorus content, sulfur content 0.055% or less, or phosphorus, sulphur content are 0.050% or less); High quality steel (phosphorus and sulfur content in sulfur 0.030% or less).
In addition, and according to the types of smelting furnace, steel is divided into open hearth furnace steel (acid open hearth furnace, alkaline open hearth furnace), air converter steel (Bessemer converter, Thomas, basic oxygen furnace steel) and electric steel. According to the smelting deoxidizing degree, will steel is divided into rimming steel (deoxidized incomplete), killed steel (deoxidized comparative completely) and half killed steel.
Steel mills in steel products named, often will use, composition, quality the three combination classification method. If the steel is called common carbon structural steel, high quality carbon structural steel, carbon tool steel, high quality carbon tool steel, alloy steel, alloy tool steel, etc. Are 0.040% or less); High quality steel (or less phosphorus content 0.035%)grinding spindle