Now there are a lot of 304 stainless steel pipes on the market, so how do we choose high-quality 304 stainless steel pipes? This is a question that everyone is very concerned about. What are the methods for choosing high-quality 304 stainless steel pipes?
Generally, high-quality 304 stainless tubings have their own characteristics: 1. Check whether the word "304" is printed on the steel pipe, and ask for the manufacturer's quality certificate and quality guarantee. 2. Test with weak acid reagent. After 30 seconds, the material 304 will not change color, and the material 201 will turn black. 3. Check whether the color of the outer surface and inner wall of the 304 stainless steel pipe is bright and smooth, whether the thickness is uniform, or whether there is roughness, whether there is leakage of welding, black lines, peeling, etc.
4. When purchasing, choose brand-name products above the provincial level that have been assessed by the Quality and Technical Supervision Bureau. It is the most direct and effective purchase method to have a long-term use testimonial and a good reputation among customers. 5. Whether 304 stainless tubing is produced with high-quality raw materials from large manufacturers, and whether they are at the forefront of the industry in terms of pipe-making precision and technological level. Whether the product has the characteristics of good formability, high gloss, strong bending and durability.
In the application of stainless steel pipe, 304 stainless steel pipe is the most common raw material. But many people don't know how to choose 304 stainless tubing. So how to distinguish the pros and cons of 304 stainless steel pipe?
The method of distinguishing the pros and cons of 304 stainless steel pipe: what is the shrinkage cavity? Shrinkage cavity is when the stainless steel liquid shrinks in the mold in a liquid state, sometimes due to the influence of the environment, such as air, temperature, etc., some shrinkage cavities are formed. From a professional point of view, it is called shrinkage cavity.
The transverse crack is relatively easy to understand, that is, a transverse crack occurs on the surface of the 304 stainless steel pipe, which generally occurs during the ingot period, but most of them are shallow in depth. Knowing the transverse crack, then the meaning of the longitudinal crack is obvious. Longitudinal cracks are longitudinal cracks on the surface of the steel ingot, which generally appear in the upper part and corners, and the longitudinal cracks on the top will be deeper. As mentioned above, longitudinal cracks may occur in the upper or corners of the 304 stainless steel tube, and sometimes there will be shell-like or tumor-like metal splashes in the lower area, which looks like a layer of scars. However, this problem is rare.