Each product because of the different uses, its processing technology and raw material quality requirements are also different. In general, stainless steel products are different, its requirements for raw material thickness tolerances are also different, such as the second kind of tableware and thermos cup, thickness tolerance generally higher requirements, for-$number, and a class of tableware thickness tolerance general requirements-5%, steel pipe class requirements-10%, hotel use of wood thickness tolerance requirements for-8%, Distributors ' requirements for thickness tolerances are generally in -4%~6% rooms. At the same time, the difference between internal and external sales of products will also lead to customer thickness tolerance requirements of raw materials different. General export products Customer thickness tolerance requirements are higher, while domestic enterprises on the thickness tolerance requirements are relatively low (mostly for cost considerations), some customers even require-15%.
①DDQ (deep drawing quality) material: refers to the use of deep Pull (Chong) materials, that is, the soft material, the main feature of this material is the elongation rate is higher (≧53%), low hardness (≦170%), the internal grain level between 7.0 ~ 8.0, deep stamping performance is excellent. Many production of Thermos flask, pot-type enterprises, its product processing ratio (blanking size/product diameter) is generally relatively high, their processing ratio of 3.0, 1.96, 2.13, 1.98. SUS304DDQ material is mainly used for these higher processing requirements of products, of course, more than 2.0 of the processing of products generally need to undergo several times of stretching to complete. If the material extension is not up to the words, in the processing of deep pull products are very easy to produce cracks, pull through the phenomenon, affecting the finished product pass rate, of course, also increased the cost of manufacturers;
② General material: mainly used in addition to DDQ use of materials, this material is characterized by a relatively low elongation (≧45%), and hardness is relatively high (≦180HB), the internal grain level of 8.0 ~ 9.0, compared with the DDQ, its deep punching performance is relatively slightly worse, It is mainly used for products that can be obtained without stretching, such as spoons, spoons, forks, electrical appliances and steel tubes for a class of tableware. But it has one advantage compared with the DDQ material, is the BQ is relatively good, this is mainly because of its hardness slightly high reason.
Stainless steel sheet is a low price material, but the customer's surface quality is very high. Stainless steel sheet in the production process will inevitably appear a variety of defects, such as scratches, pitting, Chacon, dark lines, creases, pollution, and so on its surface quality, such as scratches, creases and other defects are not allowed to appear in high-grade materials, and hemp Point, Chacon this defect in the spoon, spoon, fork, production is also not allowed, because the polishing is difficult to throw it off. Depending on the degree and frequency of the surface defects, determine the quality level of the table to determine the product level.