Due to the different uses of each product, its processing technology and quality requirements of raw materials are also different. Generally speaking, different stainless steel products require different raw material thickness tolerances, such as second-class tableware and insulation cups. Thickness tolerances are generally higher, -3 ~ 5%, while first-class tableware thickness tolerances are generally required- 5%, steel pipe requirements of -10%, hotel refrigerator freezer material thickness tolerance requirements of -8%, dealers' requirements for thickness tolerances are generally between -4% ~ 6%. At the same time, the different domestic and foreign sales of the product will also lead to different customer requirements for raw material thickness tolerances. The thickness tolerance requirements of general export product customers are relatively high, while domestic sales enterprises have relatively low thickness tolerance requirements (mostly due to cost considerations), and some customers even require -15%.

　　① DDQ (deep drawing quality) material: refers to materials used for deep drawing (punching), which is what we call soft materials. The main characteristics of this material are higher elongation (≧ 53%) and hardness Low (≦ 170%), the internal grain grade is between 7.0 and 8.0, and the deep drawing performance is excellent. Many companies producing thermos bottles and pots generally have higher processing ratios (BLANKING SIZE / product diameter), and their processing ratios are 3.0, 1.96, 2.13, and 1.98, respectively. SUS304DDQ materials are mainly used for these products that require higher processing ratios. Of course, products with a processing ratio exceeding 2.0 generally require several passes to complete. If the raw material extension cannot be achieved, the product is prone to cracks and punctures when processing deep-drawn products, which affects the qualification rate of the finished product, and of course increases the cost of the manufacturer;

　　② General material: It is mainly used for materials other than DDQ. This material is characterized by relatively low elongation (≧ 45%) and relatively high hardness (≦ 180HB). The internal grain size is between 8.0 and 9.0. Compared with DDQ materials, its deep-drawing performance is relatively poor. It is mainly used for products that can be obtained without stretching, such as spoons, spoons, forks, electrical appliances, and steel pipes for tableware. But it has an advantage compared with DDQ material, that is, the BQ property is relatively good, which is mainly due to its slightly higher hardness.

　　Stainless steel sheet is a not expensive material, but customers have very high requirements for its surface quality. Stainless steel sheets will inevitably have various defects during the production process, such as scratches, pits, sand holes, dark lines, creases, pollution, etc., so their surface quality, such as scratches and creases, are high-grade materials. It is not allowed to occur, and defects such as pits and sand holes are never allowed in spoons, spoons, forks, and during production, because it is difficult to throw it away during polishing. Need to determine the quality level of the table according to the degree and frequency of the appearance of various defects, so as to determine the product level.