Angle iron, commonly known as angle steel, is a long strip of steel with two sides perpendicular to each other. There are equilateral angle steel and unequal angle steel. The two sides of an equilateral angle are equal in width. There are many types of angle iron specifications, do you know how to divide them? What are the functions of angle iron? Angle iron is widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction towers, container racks and warehouses. Let's take a closer look at the relevant knowledge of angle iron.Are angle iron and angle steel the same material?are the same material. Angle steel is commonly known as angle iron, and its section is a long strip of steel with two sides perpendicular to each other. Angle steel is divided into equal-sided angle steel and unequal-sided angle steel. Its specifications are expressed in millimeters of side width × side width × side thickness.Angle steel is a carbon structural steel for construction, which is a section steel with a simple section, mainly used for metal components and the frame of a workshop. In use, it is required to have good weldability, plastic deformation performance and certain mechanical strength. The raw material billet for producing angle steel is low carbon square billet, and the finished angle steel is delivered in hot-rolled, normalized or hot-rolled state.Angle iron specifications and modelsIt is mainly divided into two types: equal-sided angle steel and unequal-sided angle steel. Among them, the unequal-sided angle steel can be divided into two types: unequal-sided and equal-thickness and unequal-sided and unequal-thickness.1. The specification of angle steel is expressed by the dimensions of side length and side thickness.At present, the domestic angle steel specifications are 2-20, and the number of centimeters of the side length is the number. The same angle steel often has 2-7 different side thicknesses. Imported angle steel indicates the actual size and thickness of both sides and the relevant standards. Generally, large angle steels with a side length of 12.5cm or more are medium-sized angle steels with a side length of 12.5cm-5cm, and small-sized angle steels with a side length of less than 5cm.2. The order of import and export angle steel is generally based on the specifications required in use, and its steel grade is the corresponding carbon steel grade. In addition to the specification number, angle steel has no specific composition and performance series.3. The delivery length of angle steel is divided into fixed length and double length. The selection range of fixed length of domestic angle steel is 3-9m, 4-12m, 4-19m and 6-19m according to the different specifications. The length of angle steel produced in Japan ranges from 6 to 15m.4. The section height of the unequal angle steel is calculated according to the long side width of the unequal angle steel. Refers to steel with an angular section and unequal lengths on both sides. It is a kind of angle steel. Its side length is 25mm×16mm～200mm×125mm. Rolled by hot rolling mill. The general unequal angle steel specifications are: ∟50*32--∟200*125, the thickness is 4-18mm.5. Unequal angle steel is widely used in various metal structures, bridges, machinery manufacturing and shipbuilding, various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transportation machinery, ships, industrial furnaces, reaction Towers, container racks and warehouses, etc.What are the uses of angle ironThe angle iron can be composed of various stress-bearing components according to the different needs of the structure, and can also be used as a connecting piece between the components. It is widely used in various building structures and engineering structures, such as beams, bridges, transmission towers, lifting and transporting machinery, ships, industrial furnaces, reaction towers, container racks and warehouses.

Cold-rolled flat steel is a finished steel, which is a type of section steel. Because the section is rectangular, it is a simple section steel. The cold-rolled flat steel production workers use the flat steel finishing machine to pre-level and level the thickness direction of the cold flat steel wool with two sets of leveling wheels arranged up and down staggered; a pair of oppositely arranged finishing wheels are used. Squeeze in the width direction, so that the width is compressed to achieve the expected parameters, and the amount of compression is adjustable. The entire production process requires two cold rolling processes to complete.1. Start cold rollingTake a steel bar and apply tensile stress to it by cold rolling, and the steel bar will deform. As the tensile stress increases, the tensile stress within the steel bar increases gradually. When the tensile stress generated inside the steel bar exceeds the yield point A of the steel bar and reaches C, the cold rolling is stopped and the load is removed. At this time, it can be seen that the steel bar has undergone plastic deformation. During the unloading process, there is a change in the stress-strain diagram, and the straight line O1C is slower than the straight line OA.2. The second cold rollingThe tensile stress is re-applied, and the steel bar is stretched to failure, and the stress-strain diagram has a new change. The new yield point is near point C, which is significantly higher than the original yield point A. This change shows that the plasticity of the steel bar has changed, the plasticity is small, the hardness is large, and the strength of the steel bar is improved. This phenomenon is called deformation hardening. After the above two processes, the cold-rolled steel bar is produced.Control of cold rolling stress:For grades II, III, IV and No. 5 steel bars, after cold rolling, those used as prestressed steel bars should be controlled by cold rolling stress. However, after inspection of the steel bar after cold rolling, the cold rolling rate exceeds the specified value of the specification, and another mechanical energy test is required.Cold rolling rate measurement and control requirements:When the cold rolling of steel bars is controlled by the cold rolling rate, the control value shall be determined by experiments. Requirements for the test and measurement: There should be no less than 4 test pieces in the same furnace and the same batch. Each test piece should measure the corresponding cold rolling rate according to the cold rolling stress specified in the specification, and take the average value of the test pieces as the furnace. The actual cold rolling rate of the batch of steel bars. If the strength of the steel bar is high, and the average cold rolling rate is lower than 1%, the cold rolling rate of 1% should still be controlled during the cold rolling of the steel bar.Cold rolling speed control: In order to fully deform the steel bar, it is necessary to properly control the cold rolling speed, generally 0.5--1.0 is appropriate. At the same time, it is required that after the cold rolling reaches the specified stress and cold rolling rate, immediately stop pulling for 2-3, and then relax the steel bar and end the cold rolling, so as to give the steel bar sufficient time to deform.Cold rolled flat steel can be used as a material for making iron hoops, tools and machine parts. Used as building frame structure and escalator. Flat steel is divided into two types according to its shape: flat steel with flat springs and flat steel with double grooves on one side. Hot-rolled spring flat steel is mainly used in the manufacture of mechanical leaf springs for automobiles, tractors, and railway transportation.

Bright flat steel is widely used in the production process because of its higher strength and brighter than other steels. Flat steel is also used in construction such as house construction and industrially for machine parts. In general, flat steel is favored by people as a common steel.Flat steel refers to steel with a width of 12-300mm, a thickness of 3-60mm, a rectangular cross-section and a slight blunt edge. Flat steel can be scrap steel, and can also be used as blanks for welded pipes and thin slabs for stacked sheets. Main uses: flat steel can be used as a finished material to make hoop iron, tools and mechanical parts, and it can be used as a building structure and escalator in buildings.The function and usefulness of flat steel:1. Hot-rolled flat steel can be used to manufacture components, escalators, bridges, and fences.It has good strength, and the appearance is relatively bright compared to other steels. In addition, the pitch of the thickness specification of the hot-rolled flat steel is very tight, which also determines that it is very suitable for welding. It is worth mentioning that the bearing weight of flat steel is relatively large. In the process of consumption of components, escalators and fences, welding is an indispensable processing technology. At the same time, such objects must also require the surface of the steel to be lubricated and can carry a certain amount of heavy objects. And some properties of flat steel just fully meet the requirements. This makes it a raw material for processing and manufacturing components, escalators, and fences.2. Slabs that can be used as welded steel billets and stacked sheets.Hot rolled flat steel is a steel with a rectangular interface, which can be regarded as a part of a long steel plate. This also enables it to be processed into a larger steel plate. Third, it can be manufactured as a hoop iron material.Flat steel is a long strip of steel with a complete range of thickness and width. In addition, the flexibility and comparison of flat steel is good, and it can be used as a material for processing and manufacturing hoop iron.In general, hot-rolled flat steel, as a kind of widely used steel, can be used for production of fixed thickness, fixed width and fixed length according to user needs. It is one of the important materials that are indispensable for construction and other industries.

With the passage of time, there will always be some defects in cold-rolled flat steel. In addition to strengthening its maintenance during use, how to improve the comprehensive performance of cold-rolled flat steel and prolong its service life during initial processing operations Woolen cloth? Let us analyze it from its processing technology.Because the surface of cold-rolled flat steel contains a certain steel cost, if it is exposed to the air for a long time, it will be corroded to different degrees. Although the impact resistance of cold-rolled flat steel itself is very high, there will inevitably be some rust stains on the surface of the product.We can take some measures for this. The aluminum material or galvanized component is applied to the defect of the flat steel, and the whole piece is rapidly converted into a chemical film during the phosphating process, thereby forming a phosphating film. At the same time, the phosphating treatment of flat steel is a kind of chemical and electrochemical reaction, which can improve the density of metal objects on the original basis.In addition, the flat steel can also play the role of friction reduction and lubrication during processing, and improve the adhesion of the product to achieve practicality. Cold-rolled flat steel is a kind of steel produced by cold-rolling, but in this process, it is necessary to strictly abide by the corresponding safety operation specifications, otherwise it is likely to cause accidents.Usually before cold rolling, baffles need to be set up to achieve the purpose of protection. If there is no baffle, then the hoist and cold rolling direction can be kept at 90 degrees, and closed guide pulleys are used. During the operation, the staff must stand behind the protective baffle to prevent the chips generated during the cold rolling of the cold rolled flat steel from jumping out. In addition, a comprehensive inspection of the equipment should be carried out to avoid accidents.When cold-rolled flat steel is formed, in order to ensure quality, it is necessary to ensure that its surface is smooth and flat. This can prevent foreign matter from adhering, thereby reducing the chance of being corroded. Because of this, cold-rolled flat steel also needs to be finished and kept clean during use.Through the above content, you can understand that the comprehensive performance is improved by means of phosphating treatment, thereby enhancing various performances. Maintaining cleanliness during processing is also a point of attention in the production of cold rolled flat steel.