Because of the different uses of each product, its process and materials quality requirements are also different. Generally different stainless steel products, which require raw materials thickness tolerances vary, like second-class cutlery and mug, etc., generally require a higher thickness tolerances, -3 to 5%, and a thickness tolerance tableware General requirements – 5% -10% steel such requests, hotels with a freezer timber thickness tolerance requirements for 8%, dealers thickness tolerance requirements generally between 4% to 6%. At the same time export products will lead to different customers in different thickness tolerance requirements for raw materials. Generally higher exports of customers thickness tolerance requirements, while domestic enterprises thickness tolerance requirements are relatively low (mostly because of cost considerations), some customers even require -15%.
①DDQ (deep drawing quality) material: refers to the material used for deep drawing (punching) use, that is, we called a soft material, the main characteristics of this material is higher elongation (≧ 53%), compared with the hardness low (≦ 170%), internal grain grading between 7.0 to 8.0, excellent deep drawing properties. Many production thermos pot class enterprises, processing their products generally have higher than (BLANKING SIZE / products in diameter), which processed more than 3.0,1.96,2.13,1.98 respectively. SUS304DDQ timber is mainly used for processing these requests higher than that of the product, of course, the processing ratio of more than 2.0 products are generally subject to stretch a few times to complete. If the extension of terms of raw materials reach it, in the processing of deep drawing products product cracks easily, pull wear phenomenon, affecting the rate of qualified products, of course, will increase the cost of manufacturers;
② General Material: mainly used for purposes outside except DDQ material characteristics of this material is relatively low elongation (≧ 45%), while the hardness is relatively high (≦ 180HB), internal grain grade of 8.0 to 9.0 Rooms, compared with DDQ timber, its performance relative somewhat less deep drawing, it is mainly used in the products can be obtained without thrust, like a class tableware spoon, spoon, fork, electrical appliances, steel uses. But it is compared with DDQ material has an advantage that BQ relatively good, mainly because of its hardness slightly higher reason.
Stainless steel sheet is an inexpensive material, but customers of its very high surface quality requirements. Stainless steel sheet in the production process inevitably there will be a variety of defects, such as scratches, pits, sand hole, dark lines, creases, pollution, etc., so that its surface quality, such as scratches, creases, etc. These defects are advanced materials allowed, and pitting, sand holes this defect in the spoon, spoon, fork, the production is never allowed because it is difficult to throw away when polishing. Required depending on the degree and frequency of surface defects of various kinds, to determine its quality level table, thereby to determine the product level.