1. The method of distinguishing the quality of 304 stainless steel pipes 1. Shrinkage cavity What is shrinkage cavity? Shrinkage cavity is formed when the stainless steel liquid is in a liquid state and shrinks in the mold, sometimes due to the influence of the environment, such as air, temperature, etc. Some shrinkage cavities are called shrinkage cavities from a professional point of view. 2. Transverse cracks Transverse cracks are relatively easy to understand. Transverse cracks occur on the surface of stainless steel pipes. Generally, transverse cracks occur during the steel ingot period, but most of them are shallow in depth.
3. Longitudinal crack Knowing transverse crack, then the meaning of longitudinal crack is obvious. Longitudinal cracks are longitudinal cracks that appear on the surface of steel ingots, generally appearing in the upper part and corners, and the longitudinal cracks appearing in the upper part will be deeper.
4. Scarring As mentioned above, there may be longitudinal cracks in the upper part or corners of the stainless steel pipe, and sometimes there will be metal spattering of shell skin makeup or tumor makeup in the lower area, which looks like a knot. Layers of scars are the same, so they are called scars. However, this problem is actually very rare.
5. Surface pores The pores of 304 stainless steel pipes are also well understood. Many small pores can be seen with the naked eye on the surface of stainless steel. Most of these pores are very shallow, like transverse cracks.