Three characteristics of stainless steel pipe: weldability, corrosion resistance and polishing performance (BQ)
Weldability
The requirements for welding performance are different for different product uses. This type of tableware generally does not require welding performance, and even includes some pot enterprises. However, most products need raw materials with good welding performance, such as class II tableware, thermos cup, steel pipe, water heater, water dispenser, etc.
Corrosion resistance
The vast majority of stainless steel products require good corrosion resistance. Stainless steel pipes, such as class I and II tableware, kitchenware, water heater, drinking water machine, etc., some foreign businessmen also conduct corrosion resistance tests on the products: heat the products with NaCl aqueous solution to boiling, pour out the solution after a period of time, wash and dry, and weigh the weight loss, To determine the degree of corrosion (Note: when polishing the product, due to the composition of Fe in the abrasive cloth or abrasive paper, rust spots will appear on the surface during the test)
Polishing performance (BQ)
At present, stainless steel products are generally polished during production. Only a few products, such as water heaters and water dispensers, do not need polishing. Therefore, it requires good polishing performance of raw materials. The main factors affecting polishing performance are as follows:
① Surface defects of raw materials. Such as scratches, pockmarks, acid pickling, etc.
② The raw materials and materials of stainless steel pipes. If the hardness is too low, it is not easy to polish (BQ property is not good), and if the hardness is too low, orange peel is easy to appear on the surface during deep drawing, thus affecting BQ property. The BQ property with high hardness is relatively good.
③ After deep drawing, small black spots and riding will appear on the surface of the area with great deformation, thus affecting the BQ property.
