Straight Seam Steel Pipe Hot Deformation Processing Method

Heat treatment is an important process in the manufacture of machinery, as compared with other processing, heat treatment generally does not change the overall shape and chemical composition of the workpiece, but by changing the microstructure within the workpiece, or a change in the chemical composition of the workpiece surface give or improve the performance of the workpiece. Its characteristics are intrinsic to improve the quality of the work, which is generally not the naked eye can see. To make straight seam steel pipe with the required mechanical properties, physical properties and chemical properties, in addition to a reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used in machinery industry materials, iron and steel complex microstructures can be controlled by heat treatment, the heat treatment of steel is the main content of steel heat treatment. Further, aluminum, copper, magnesium, titanium and their alloys can also be changed by the heat treatment the mechanical, physical and chemical properties, to achieve different performance. The correct heat treatment process operation and reasonable heat treatment process is also a useful way to reduce the clutter of precision mold deformation. Cause deformation of precision molds is often messy messy, but we need to master the rules of the deformation analysis of the onset of the reason, the choice of methods to avoid abnormal deformation of the mold can be reduced, but also can be controlled.   Molds for precision pre messy heat treatment, machining process to eliminate the remaining stress episodes. Molds for precision messy, under the conditions allow, try to use cryogenic vacuum heat treatment and quenching after quenching. Under the premise of mold hardness assurance, try to use pre-cooling, grading quenching or cooling temperature quenching process. Molds for precision messy good material should be selected micro deformation of steel, carbide segregation serious casting mold steel should be reasonable and transfer of heat treatment, solution heat treatment on a large double refining and casting mold steel can not be. Reasonable choice of heating temperature, heating rate control, precision messy mold can be used on slow heating, preheating and other methods to reduce mold balanced heating heat deformation. Die planning depicted to be reasonable, not too poor thickness, the shape should be symmetrical about the large deformation mold deformation to master the rules, set aside allowance, portfolio planning on large, sophisticated messy mold can be used. Precision molds for some messy optional pre-heat treatment, aging heat treatment, quenching and nitriding heat treatment to control the accuracy of the mold. When repairing mold trachoma, porosity, wear and other defects, such as a small selection of cold welding heat affected repair equipment repair process to avoid the onset of deformation. Fine messy cause deformation of the mold is often messy, but we need to grasp the deformation rules and analyze the reasons of its occurrence, the choice of a strange approach to prevent deformation of the mold can be cut, but also can be manipulated. The correct heat treatment process operation (such as plugging holes, tie holes, mechanical fastening, suitable heating methods, the selection of the correct direction of the mold cooling and direction of movement of the cooling medium, etc.) and reasonable heat treatment process also cuts fine mess mold deformation useful approach.