Dished head, also known as hemming with spherical head. Consists of a sphere, a cylinder of a straight edge height and radius of curvature of connecting these two portions is substantially less than the radius of the spherical part of the composition of the transition. Dished head as a continuous surface, at the junction of three parts, the radius of curvature of the warp mutations, due to changes in curvature, therefore there is bending stress. Bending stress and tensile stress superposition result, the stress this part protruding from the rest. Compared with oval head, uniform stress distribution which is better, but easier than working, which is not ideal in engineering use. But when the head of the oval mold is difficult, then replaced with a dished head.
What are the most commonly used stainless steel dished head
1, 304 stainless steel dished head, suitable for use in outdoor environment
2, 321 stainless steel dished head, suitable for the environment with high resistance to corrosion;
3, 316L stainless steel dished head, suitable for the use of high temperature corrosion resistance;
4, 310S stainless steel dished head, suitable for use under high temperature conditions
Stainless steel plate is commonly used in the head of these materials, of course, there are some 2205, 309, and other stainless steel.
How to identify the stainless steel dish head material is up to the standard
Nowadays, stainless steel dish head price more and more transparent, which leads to many unscrupulous businessmen, shoddy, weeding, like 304 use 301 material instead to earn a profit, so how to distinguish whether the material standards?
1, the use of stainless steel syrup to test
2. Chemical composition analysis by spectrometer
3, salt spray test, simulation of the actual use of the environment.
The liquid medicine test is the most used and most convenient, the spectrometer cost is higher.