The hot bearing and cold bearing are the processes of steel plates or profiles, which have a great impact on the fabric and the performance of the steel.
The steel bearing is mainly hot bearing.
Common situation in cold and cold steel:
Wiring: 5.5-40 mm in diameter, in the shape of a coil, all hot materials. After cold traction, it is a cold traction material.
Round steel: in addition to precise light, it is generally hot and there are forged materials (there are marks on the surface).
Bring the steel: hot cold bearing, cold rolling materials are generally thin.
Steel plates: cold plates are generally thin, such as car plates;
Horn Steel: Everything is hot.
Steel pipes: hot and cold hot traction.
Steel sink and steel in the shape of H: hot bearing.
Reinforced: hot rolled material.
Hot rolled
In terms of definition, it is difficult to deform at room temperature at room temperature and is not easy to treat.
The temperature of termination of the hot bearing is generally 800 to 900 ° C. After that, it is generally cooled in the air, so the hot bearing state is equivalent to a positive fire treatment.
Most steel are rolled in hot bearing methods. The steels delivered by a hot state, due to the high temperature, generate a layer of iron oxide skin on the surface, so that it has a certain resistance to corrosion and can be stored outdoors.
However, this layer of iron oxide leather also makes the surface of the hot steel rough and has a large fluctuating size. as raw materials then produced.
advantage:
1. The quick -molding speed, high performance and no damage to the coating, can be transformed into a variety of section forms to meet the needs of the conditions of use; Steel point yield. Disadvantages: 1. Although there is no plastic compression of heat during the molding process, there is still a residual constraint in the transverse section, which will inevitably affect the characteristics of the global and local flexion of ‘steel;
2. Cold steel styles are generally the transverse section of the opening, so that the free rigidity of the section of the section is lower. It is subject to twist during bending.
3. The thickness of the wall in cold molding steel is smaller and the corner of the plate is not thickened. Cold rolling and cold bearing refer to the steel shape of the roll of the roller pressure at the roller pressure.
Although the processing process can also heat the steel plate, it is always called cold bearing. More specifically, the cold hot steel rolls are used as raw materials.
Generally, cold steel, such as galvanized and colorful steel plates, must be received, so that plasticity and extension rate are also good. The surface of the cold plate has a certain degree of cleanliness, and the hands are relatively smooth, mainly due to the problem of stripping.
The general surface of hot rolled plates does not meet the requirements, so that the hot steel belt needs cold bearing, as well as the thinnest thickness of the hot steel belt is generally 1.0 mm, and cold ride can reach 0.1 mm.
The hot bearing rolls above the crystalline temperature point and the cold bearing rolls below the crystalline temperature point.
Cold ride
The change in steel shape is a continuous and cold deformation. For the use of the terminal, cold stamping performance deteriorates and the products are suitable for simple deformation parts.
advantage:
It can destroy the organization of steel ingots flow, refine the steel grains and eliminate the defects of microruban organizations, so that the steel fabric is dense and the mechanical performance is improved. This improvement is reflected mainly in the direction of rolling, so that steel is no longer the same body-sex to a certain extent;
default:
1. After rolled heat, various non -metallic materials (mainly sulfides and oxides and silicate) inside the steel are pressed in thin slices and layers in layers. The hierarchy makes the performance of the steel in the thickness of the thickness, and it is possible to tear the layer when the narrowing of the weld. The local deformation induced by the welding seams often reaches several times the deformation of the point of yield, which is much greater than the deformation caused by the load;
2. Residual constraint caused by unequal cooling. Residual stress is the stress that internal self-balance is balanced without external forces. Although the residual stress is self-balanced, it always has a certain impact on the performance of steel components under external force. Such as deformation, stability and anti-law can have an unfavorable effect. Summary: The temperature of the cold bearing and the hot bearing is mainly the temperature of the rolling process.
The “cold” is a normal temperature and the “heat” is at high temperature. From the point of view of metal science, the border between the cold and hot bearing must be distinguished from the crystallizing temperature. In other words, the crystalline temperature rolling is cold rolled and the crystalline temperature bearing is hot rolled.
The re-customization temperature of steel is 450 to 600 ° C.
The main difference between the hot bearing and the cold rolling is:
1. Surface appearance and quality: since the cold plate is obtained after the work of cold rolling, and the cold bearing is also carried out on the quality of the surface (like surface roughness) on the surface, it occurs So if there are high requirements for the quality of the post-order paint on the product, the cold plate is generally selected. Or there is a black layer with three tetraonic oxide. In simple terms, it is too hot, and if the environment is not good, it usually takes a little rust.
2. Performance: In normal circumstances, the mechanical performance of the heating plate and the cold plate in the project are not considered different. it is different). But it doesn’t matter how intensive the cold plate is than the heating plate.
3. The performance of training performance is that the performance of the hot and cold plate are not very different, therefore the factors of influence of training performance depend on the difference in surface quality. In general.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
