10,781,080 steel structural steel tool steel 108,610,901,095 1084

Carbon structural steel, the English name: carbon structural steel, carbon is about 0.05 to 0.70%, the individual can be as high as 0.90 percent. It can be divided into ordinary carbon steel and two types of high-quality carbon steel structure. Many uses, the amount of large, mainly for railways, bridges, all types of construction, manufacturing under static load of metal components and mechanical parts and weldments unimportant Usually does not require heat treatment. 1. Press the chemical composition of carbon steel by chemical composition (ie, carbon content) can be divided into low-carbon steel, carbon steel and high carbon steel. (1) low-carbon steel, also known as mild steel, carbon content of from 0.10 to 0.30 percent of low-carbon steel is easy to accept all kinds of processing such as forging, welding and cutting, commonly used in the manufacturing chain, rivets, bolts, shaft. (2) the amount of carbon in the steel of 0.25% to 0.60% carbon steel. It has killed steel, semi-killed steel, rimmed steel and other products. In addition to carbon also contain minor amounts of manganese (0.70% to 1.20%). By product quality is divided into ordinary carbon steel and quality carbon structural steel. Thermal processing and cutting good, poor welding performance. Strength, hardness higher than the low-carbon steel, while ductility and toughness lower than low carbon steel. Do not heat treated, the direct use of hot-rolled sheet, cold-drawn materials, may also be used after heat treatment. After quenching the steel has good mechanical properties. The highest attainable hardness of about HRC55 (HB538), σb is 600 ~ 1100MPa. So moderate intensity levels for various applications, carbon steel the most widely used, except as a building material, but also used extensively for the manufacture of mechanical parts. (3) high-carbon steel often called tool steel, carbon content from 0.60 to 1.70%, can be hardened and tempered. Hammers, crowbars, etc. by the carbon content of steel 0.75%; cutting tools such as wire-tapping, reamers, etc. by the carbon content of steel 0.90 to 1.00% of. Welcome to the new and old customers to negotiate, 0769-85550763 Zhang Qian 13,553,856,431 2. classified according to the quality of steel quality steel can be divided into ordinary carbon steel and high-carbon steel. (1) ordinary carbon steel, also known as ordinary carbon steel, restrictions on carbon content, performance range as well as phosphorus, sulfur and other residual content wider. In some countries and are divided into three categories according to delivery guarantee conditions: Group A steel (A type of steel) is to ensure that the mechanical properties of the steel. B Steel (B class steel) is to ensure that the chemical composition of the steel. C type steel is the only guarantee to ensure that the chemical composition and mechanical properties of the steel used in the manufacture of the more important. China is currently the largest production and use of carbon content of about 0.20 percent of A3 Steel (Group 3 steel), mainly used. Some carbon steel also added a small amount of aluminum or niobium (or other forming element) forming a nitride or carbide particles to limit grain growth, strengthen the steel, save steel. China and some countries in order to meet the special requirements of professional steel, chemical composition and properties of ordinary carbon steel to be adjusted so as to develop a series of common professional steel structural steel elements (such as construction steel, etc.) . (2) high-quality carbon structural steel and ordinary carbon steel compared to sulfur, phosphorus and other content low. Depending on the carbon content and the use of such steel roughly divided into three categories: ① less than 0.25% C mild steel, especially carbon content less than 0.10% of the 08F, 08Al, etc., because of the deep well drawability and weldability and is widely used as deep drawing parts such as automotive, canning, etc. ....... 20G is the main material for manufacturing ordinary. In addition, as a low-carbon steel it is also widely used for machinery manufacturing. ②0.25 ~ 0.60% C is carbon steel, much used in the quenched state, production machinery manufacturing industry. ③ more than 0.6% C high-carbon steel, used for manufacture of springs, gears, rollers and the like. Depending on the amount of manganese, manganese content can be divided into ordinary (0.25 to 0.8%) and high manganese content (0.7% to 1.0% and 0.9 to 1.2%) two steel groups. Manganese can improve the steel hardenability, strengthening to improve the tensile strength and wear resistance of steel. Usually after a high grade manganese steel additional mark "Mn", such as 15Mn, 20Mn manganese content in order to distinguish it from normal carbon steel. Welcome to the new and old customers to negotiate, 0769-85550763 13553856431 Zhang Qian. 3. By Application by end-use is divided into carbon structural steel. Carbon tool steel carbon content of between 0.65 to 1.35%, after heat treatment to obtain high hardness and wear resistance, mainly used in the manufacture of various tools, cutting tools, dies and gauges (see tool steel). Carbon steel in accordance with yield strength of steel is divided into five grades: Q195, Q215, Q235, Q255, Q275 due to the different quality of each grade is divided into A, B, C, D grades, up to four, and some only one ; in addition to the steel smelting method of deoxidation difference. Deoxy method symbols: F- B- boiling steel semi-killed steel Z- killed steel TZ- special killed steel welcome new and old customers to negotiate, 0769-85550763 13553856431 Zhang Qian. Quality carbon structural steel (GB / T699-1999): steel, in addition to containing carbon (C) elements and a certain amount of deoxidation (Si) (generally not more than 0.40%), manganese (Mn) (generally not more than 0.80% higher to 1.20% can be), but without other alloying elements (except residual elements). Such steel must also ensure that the chemical composition and mechanical properties. Sulfur (S), phosphorus (P) impurity element content is generally controlled 0.035% or less. If the controlled 0.030% or less were called high quality steel, which should be added behind grade "A", such as 20A; if P control 0.025%, S controlled 0.020% or less, said premium quality steel, which should be added later grades "E" to show the difference. For the raw materials into steel other residual alloying elements such as chromium (Cr), Nickel (Ni), copper (Cu) content such as general control Cr≤0.25%, Ni≤0.30%, Cu≤0.25%. Some grades of manganese (Mn) content of 1.40%, called manganese steel. Such adjustment is to rely on the carbon steel (C) amount to improve the mechanical properties of the steel, and therefore, according to the level of the carbon content, such steels can be divided into: carbon content is generally less than 0.25%, such as 10, 20 steel ; carbon content generally between 0.25 to 0.60%, such as 35, 45 steel; carbon content generally greater than 0.60%. Such steel is generally not used to make steel. In fact, the carbon content between them and no clear boundaries. Such a large steel production, uses a wider, and more generally rolling (forging) is made of round, square, flat and so on. Mainly for the manufacture of general structural and mechanical structure parts and components as well as building structures and transmission fluid pipes. According to requirements, and sometimes you need to heat treatment (normalizing or quenching and tempering) after use. Welcome to the new and old customers call to discuss