Due to the different uses of each product, its processing technology and raw materials quality requirements are also different. Generally speaking, the difference of stainless steel products, its requirements for raw material thickness tolerances are also different, such as the second class tableware and insulation cup, such as the general requirements of thickness tolerance, for-3~5%, and a class of tableware thickness tolerance general requirements-5%, steel pipe requirements-10%, hotels with refrigerator thickness tolerance requirements of-8%, The distributor's requirement for thickness tolerances is generally between -4%~6%. At the same time, the different internal and external sales of products will also lead to customers on the thickness of raw materials tolerance requirements.
General export products customers have a high thickness tolerance requirements, while domestic enterprises on the thickness tolerance requirements are relatively low (mostly for cost reasons), some customers even require-15%. ①DDQ (deep drawing quality) material: refers to the use of deep pull (punching) materials, that is, the soft material described by everyone, the main characteristics of this material is higher elongation (≧53%), low hardness (≦170%), internal grain grade between 7.0~8.0, deep punching performance is excellent. Many enterprises that produce thermos bottles and pots, the processing ratio of their products (BLANKING SIZE/products diameter) is generally relatively high, their processing ratio of 3.0, 1.96, 2.13, 1.98 respectively. SUS304DDQ materials are mainly used for these products requiring a higher processing ratio, of course, processing more than 2.0 of the products generally need to go through a few times of stretching to complete.
If the extension of raw materials can not reach the words, in the processing of deep pull products products are very easy to produce cracks, pull through the phenomenon, affecting the qualified rate of the finished product, 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%), while the hardness is relatively high (≦180HB), the internal grain size grade between the 8.0~9.0, compared with DDQ materials, 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, steel pipe uses and so on, such as a class of tableware.
But it has one advantage over the DDQ material, that is, the BQ is relatively good, which is mainly due to its slightly higher hardness. Stainless steel sheet is a low price material, but the customer on its surface quality requirements are very high. Stainless thin sheet in the production process will inevitably appear a variety of defects, such as scratches, hemp points, Chacon, dark lines, creases, pollution, etc., so that its surface quality, such as scratches, creases and other defects are advanced materials are not allowed to appear, and hemp Point, Chacon this defect in spoons, spoons, forks, production is also never allowed, because polishing is difficult to throw it away. The product level needs to be determined based on the extent and frequency of the appearance of various defects on the surface to determine its table quality level.