Chinese hot-rolled steel by strength can be divided into four levels: Ⅰ grade steel strength rating of 24/38 kg, is killed steel, semi-killed steel or rimmed steel on the 3rd ordinary rolled carbon steel round bar. It belongs to low strength steel, with plastic, high elongation (δ5 more than 25%), easy to bend shape, easy to weld and so on. It's using a wide range, Mihe steel cutting machine, can be used as the main force of reinforced concrete structures of small, stirrups, steel, rod wooden structure member and the like. Cold drawn steel wire rod also serves as a low-carbon steel wire and reinforced with raw materials. Grade Ⅱ Ⅲ grade steel and low alloy steel with 金镇静 steel or semi-killed steel rolling, silicon, manganese as solid solution strengthening elements. Ⅱ grade steel intensity level is 34 (32) / 52 (50) kg; Ⅲ grade steel to 38/58 kg class, high strength, good plasticity, Nanhe crossing steel cutting machines, welding performance is ideal. Rolled steel surface with through the long longitudinal bars and transverse ribs uniformly distributed, steel cutting machine, which can strengthen the bond between steel and concrete. With Ⅱ, Ⅲ grade steel as a reinforced concrete structure reinforcement force, than with Ⅰ grade steel reinforcement can save 40 to 50%. It is widely used in large and medium-sized reinforced concrete structures such as reinforcement bridges, dams, port construction and house building structures. After Ⅱ, Ⅲ grade steel by cold drawing, can be used as prestressing steel house building structure. In general, health store steel cutting machine, cold-rolled ribbed steel bars are small in diameter, it is the common wire of the cold extrusion. After plastic deformation, the strength is drastically increased, while the plasticity is drastically reduced, thus giving rise to the kind of situation you say. Carbon 2% (by mass) or less steel, more than 2 percent of iron. Iron wrought iron of high carbon content ratio, the higher the carbon content, the greater the hardness, toughness worse. Iron is not ideal any substance containing impurities. Iron generally refers to the carbon content of 2 to 4.3 percent of the iron alloy. Also known as cast iron. Pig iron in addition to carbon, also contain silicon, manganese, and a small amount of sulfur, phosphorus, etc., it can not be wrought cast. According to the different forms of pig iron in the presence of carbon, can be divided into steel-making pig iron, cast iron and ductile iron and so are several. Steelmaking pig iron in the form of iron carbide carbon mainly exists, its cross section is white, generally known as white iron. This performance is hard and brittle pig iron, are generally used as raw material for steel making. Foundry iron in carbon flake graphite morphology to exist, it's fracture is gray, usually known as gray iron. Because graphite is soft, it has a lubricating effect, which cast iron has good cutting, wear and casting properties. But its anti-bit strong enough, it can not be wrought only be used in the manufacture of various items, such as casting a variety of machine bed seat, iron tubes. Ductile iron with spherical graphite carbon in the form of existence, and is close to steel and its mechanical properties far better than gray iron, it has excellent casting, machining and wear, have a certain flexibility, widely used in the manufacture of the crankshaft, gears, pistons and other senior casting and a variety of mechanical parts. In addition to silicon, manganese, nickel or other elements particularly high amount of iron, called iron alloy, such as ferrosilicon, ferromanganese, etc., often used for steelmaking raw materials. Adding some alloys in steel making pig iron, can improve the properties of steel. Steel cutting machine, steel cutting machine Gongyi, Kindi metallurgy (certified merchants) are provided by Di Metallurgical Equipment Co. Di Metallurgical Equipment Co., Ltd. (www.ye-jin.com) is specialized in "cold rolling mill, cold rolling mill flanks, steel straightening machine, bar straightening cutting machine, steel cutting machine" of the enterprise, the company of " honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Liu.