Analysis on the manufacturing process of stainless steel hemispherical head manufacturers!

Influence of chemical composition: according to the calculation of relevant data formulas, the △ values of 316,310 are 1 respectively. 00, 4. 72 so its very stability does not easy to produce crack. Influence of processing deformation: during the cold spinning process of stainless steel head, the deformation of the material is larger than that of the flanging part, which can reach more than 40%. According to relevant data, Cr- The effect of cold working on magnetic permeability of Ni stainless steel results in that the content of martensite decreases with the increase of chemical composition and increases with the increase of cold working deformation rate. When the deformation rates of 304 and 321 are about 15%, the increase of martensite is accelerated by 316. When the deformation rate is 60%, the increase of martensite is not obvious. Influence of welding: under the principle of equal strength, select the welding process to make the grain growth in the welding heat affected zone decrease its plasticity. The sharp notch in the welding defect is cracked during the spinning process, all make its performance lower than that of the base metal and produce cracks.

The product quality is unstable. After recent years of development, the quality of the head product has been greatly improved. However, due to the weak technical foundation, the concept that quality is the life of an enterprise has not been fully established, and the quality of products is unstable, especially the internal quality is difficult to guarantee. Some enterprise production environment also poor soot pollution serious workers labor strength big influence the enterprise image. The low quality of employees is an important part of the constituent elements of social productivity. The optimization of enterprise organization, the establishment of advanced management system, the innovation of technology and products, the improvement of product quality, etc, they all rely on talents, and the quality of employees in the head manufacturing industry is generally not high at present. A few enterprises even use some untrained migrant workers to carry out stamping operations. And not ready to extend, then you can use the head to weld to the pipe, as the end of the side to continue to use. Used in pressurized containers, both upper and lower sides have a head with a straight tube in the middle, which can be used as a jar for pressure vessels. The mechanical properties of the elliptical head are very good, even better than the disc head, just a little worse than the hemispherical head.

The Microstructure stress of stainless steel head is related to the cooling speed, shape and chemical composition of the workpiece in the martensitic transformation region. The result of the structural stress change of stainless steel head is the tensile stress on the surface layer and the compressive stress on the core, which is exactly opposite to the thermal stress. Practice has proved that thermal stress and tissue stress will occur as long as there is phase change in the heat treatment process of any workpiece. However, the thermal stress has already produced a stainless steel head before the tissue transformation, and the tissue stress is generated during the tissue transformation process. During the whole cooling process, the result of the combined action of thermal stress and tissue stress is the actual stress in the workpiece. The head mainly produces all kinds of elliptical head, Dish head, flat head, arched head, corrugated furnace liner, U-ring, spinning head, expansion joint, cone head, melon head and boiler sales,

elliptical head is a kind of boiler component in pressure vessel that uses medium frequency induction heating to locally heat the pipe while carrying out mechanical transmission to bend the pipe, the power can reach 120KW, and can heat pipes of various sizes and specifications. The heating is fast, the power can be adjusted steplessly, the starting performance is good, the performance is stable, the floor area is small, and the operation and maintenance are easy. The elliptical head is a component of the container. According to the different geometric shapes, it can be divided into spherical, elliptical, dished, spherical crown, conical shell and flat cover, among them, spherical, oval, dished and spherical Crown elliptical heads are collectively referred to as convex elliptical heads. It is applied to various container equipment, such as storage tanks, heat exchangers, towers, reactors, boilers and separation equipment. The welding process is mainly determined according to the material, brand, chemical composition, welding Structure Type and welding performance requirements of the workpiece to be welded. First, we must determine the welding methods, such as hand arc welding, submerged arc welding, argon tungsten arc welding, gas shielded welding, etc. There are many kinds of welding methods, which can only be selected according to specific conditions.