Profiles are objects with a certain geometric shape made of iron or steel and materials with certain strength and toughness through rolling, extrusion, casting and other processes. This kind of material has a certain appearance size, a certain shape of the section, and has certain mechanical and physical properties. Profiles can be used alone or further processed into other manufactured products, often used in building structures and manufacturing installations. The mechanical engineer can select the specific shape, material, heat treatment state, mechanical properties and other parameters of the profile according to the design requirements, and then divide the profile according to the specific size and shape requirements, and then further process or heat treatment to meet the design accuracy requirements. The material, specifications and dimensions of the profiles can refer to the corresponding national standards.
Steel pipes have hollow sections that are much longer than the diameter or circumference of steel. According to the cross-sectional shape, it is divided into circular, square, rectangular and special-shaped steel pipes; according to the material, it is divided into carbon structural steel pipes, low-alloy structural steel pipes, alloy steel pipes and composite steel pipes; Steel pipes for thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment, etc.; according to the production process, they are divided into seamless steel pipes and welded steel pipes, of which seamless steel pipes are divided into hot-rolled and cold-rolled (drawn) Two types, welded steel pipes are divided into straight seam welded steel pipes and spiral seam welded steel pipes. Steel pipes are not only used for conveying fluids and powdered solids, exchanging thermal energy, making machine parts and containers, but also an economical steel. Using steel pipes to make building structure grids, pillars and mechanical supports can reduce weight, save 20-40% of metal, and realize factory-based mechanized construction. Using steel pipes to manufacture highway bridges can not only save steel and simplify construction, but also greatly reduce the area of protective coating, saving investment and maintenance costs.
Strip & Coil
Steel plates with thin thickness, narrow width and long length. Its width is generally 20mm-200mm. It is supplied in rolls, and its specifications are expressed as thickness × width. According to the quality of the steel, it is divided into high-quality and ordinary strip; according to the rolling method, it is divided into two types: hot-rolled and cold-rolled, which are respectively called hot-rolled strip and cold-rolled strip. The thickness of hot-rolled ordinary strip is 2 mm-6 mm, and the thickness of cold-rolled strip is generally 0.05 mm-3.60 mm. Strip steel can be made of ordinary carbon steel, carbon structure steel, spring steel, tool steel, stainless steel and other steel grades. Widely used in the manufacture of welded pipes, clamps, gaskets, spring blades, saw blades, blades, etc. Strip steel is generally supplied in coils, which have the advantages of high dimensional accuracy, good surface quality, easy processing, and material saving.
A billet is a product obtained by casting molten steel made in a steelmaking furnace. Steel billets can be mainly divided into two types from the manufacturing process: die casting billets and continuous casting billets. The die casting process has been basically eliminated. The billet is originally steel, and after processing, it can be used as mechanical parts, forgings, processing various steels, section steel Q345B channel steel, and wire is the role of the billet. Steel billets refer to semi-finished products used in the production of steel, which generally cannot be directly used by society. There are strict classification standards for billets and steel products, which cannot be determined by whether they are the final products of the enterprise, but must be implemented according to the unified standards of the whole society. Usually, billets and steels are easy to distinguish, but for some billets, which have the same specifications and the same purpose as steel (such as rolled tube billets), it can be determined by whether they are used in other industries and whether they have gone through the steel processing process. , Whether it has been processed by the finished rolling mill to distinguish.
Wire rod is the smallest type of hot-rolled steel section. In my country, the hot-rolled round steel with a total diameter of 5 to 9 mm in total eight specifications is called wire rod. Wire rods are also called wire rods because they are delivered in coils. The concept of wire rod in foreign countries is slightly different from that in my country. In addition to circular sections, there are other shapes, and their diameters are inconsistent due to different demand and production technology levels. According to the different rolling mills, it can be divided into two types: high-speed wire rod (high wire rod) and ordinary wire rod (general wire rod). Wire rods are generally made of ordinary carbon steel and high-quality carbon steel. According to different steel distribution catalogues and uses, wire rods include ordinary low-carbon steel hot-rolled round wire rods, high-quality carbon steel wire rods, carbon welding rod wire rods, quenched and tempered threaded wire rods, wire rods for wire ropes, and wire rods for piano wires. and stainless steel wire rods
Rebar is a common name for hot-rolled ribbed steel bars. The grade of ordinary hot-rolled steel bar consists of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words, Hotrolled, Ribbed, and Bars, respectively. The hot-rolled ribbed steel bar is divided into three grades: HRB335 (the old grade is 20MnSi), grade three HRB400 (the old grade is 20MnSiV, 20MnSiNb, 20Mnti), and grade four HRB500.
Nickel is a chemical element. The chemical symbol Ni, atomic number 28, atomic weight 58.69, belongs to group VIII of the periodic system. The ancient Egyptians, Chinese and Babylonians all used meteorite iron with high nickel content to make utensils, and the nickel content in the nickel ore produced in ancient China's Yunnan was very high. In 1751, Swedish A.F. Kronstede reduced red nickel ore with charcoal to obtain metallic nickel. Its English name comes from German Kupfernickel, which means fake copper. The content of nickel ore in the earth's crust is 0.018%. The main minerals of nickel ore are pyrite, silicon-magnesium-nickel ore, needle nickel ore or yellow nickel ore, red nickel ore and so on. The reserves of nickel in the manganese nodules on the seabed are very large, and they are important prospective resources of nickel.
In the half century that blast furnace coal injection products have been industrialized and widely used, with the increasing domestic steel production capacity and the continuous improvement and improvement of the key technology of blast furnace coal injection, the market demand has gradually expanded, especially In recent years, with the increasing shortage of high-quality coking coal resources in China, the status of blast furnace injection coal in the steel smelting process has been increasing, and it is playing an increasingly important role in saving smelting costs in the steel industry. In fact, the original intention of blast furnace coal injection as a metallurgical application determines the trend: (1) Partial replacement of metallurgical coke with pulverized coal reduces the blast furnace iron-to-coke ratio and pig iron cost; (2) Adjusts the furnace condition heat system (3) The injected pulverized coal is gasified and burned in front of the blast furnace tuyere to reduce the theoretical combustion degree. In order to maintain T management, compensation is required, which creates conditions for the blast furnace to use high air and oxygen-enriched blast; (4) ) Injecting pulverized coal to replace part of the coke, on the one hand, it can save coking investment, build less coke ovens, and reduce air pollution caused by coking; on the other hand, it can greatly alleviate the tight supply and demand of coking coal.
Round steel is divided into three types: hot rolled, forged and cold drawn. The size of hot rolled round bar is 5.5-250 mm. Among them: small round bars of 5.5-25 mm are mostly supplied in bundles of straight strips, which are often used as steel bars, bolts and various mechanical parts; round bars larger than 25 mm are mainly used for the manufacture of mechanical parts and billets of seamless steel pipes Wait.
Hot-rolled flange plate is a special material for welding light H-beams of different sizes. This product optimizes the production process of welded H-beams, replaces plates, saves shearing costs, saves man-hours, saves steel consumption, and greatly reduces welding H-beams. cost of steel. Mainly used for steel structure manufacturing, bridge engineering, construction machinery, equipment manufacturing and other users who need narrow and medium plates.
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