Stainless steel making material

Stainless steel making material

Due to the different use of each product, its processing technology and raw material quality requirements are also different. Generally speaking, stainless steel products are different, the thickness tolerance of the required raw material is also different, such as two kinds of tableware and thermos cup, thickness tolerance is generally higher, is -3~5%, and a class of tableware thickness tolerance is generally -5%, steel pipe requirements -10%, the thickness tolerance of hotel cold cabinet material is -8%, Dealers' requirements for thickness tolerance are generally between -4% and 6%. At the same time, the difference between domestic and foreign sales of products will also lead to the different requirements of customers on the thickness tolerance of raw materials. Generally, customers of export products have high requirements on thickness tolerance, while domestic enterprises have relatively low requirements on thickness tolerance (mostly due to cost considerations), and some customers even require -15%.

DDQ (deep drawing quality) materials: refers to materials used for deep drawing (drawing), which is what we call soft materials. The main characteristics of this material are higher elongation (≧53%), lower hardness (≦170%), internal grain grade between 7.0~8.0, excellent deep drawing performance. Many enterprises producing thermos and pot, the processing ratio of their products (BLANKING SIZE/ product diameter) is generally relatively high, their processing ratio reached 3.0, 1.96, 2.13, 1.98 respectively. SUS304DDQ materials are mainly used for these requirements of higher processing ratio of products, of course, processing ratio more than 2.0 products generally need to be completed after several stretches. If the extension of raw materials can not be reached, in the processing of deep-drawn products, the product is easy to crack, pull through phenomenon, affect the qualified rate of finished products, of course, also increase the cost of manufacturers;

② General wood: Mainly used for materials other than DDQ, the characteristics of this material is relatively low elongation (≧45%), and relatively high hardness (≦180HB), internal grain size grade 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. Like a kind of tableware spoon, spoon, fork, electrical appliances, steel pipe use. But it has an advantage compared with DDQ material, is relatively good BQ, this is mainly due to its slightly higher hardness.

Stainless steel sheet is a kind of low price material, but the customer to its surface quality requirements are very high. Stainless sheet in the production process will inevitably appear a variety of defects, such as scratches, pitting, sand holes, dark lines, creases, pollution, etc., so that its surface quality, such as scratches, creases and other defects are not allowed to appear in advanced materials, and pitting, sand holes such defects in spoon, spoon, fork, production is never allowed, because it is difficult to throw it away when polishing. It is necessary to determine the surface quality level according to the degree and frequency of various surface defects, so as to determine the product grade.