Stainless steel features 
General Characteristics 
        Surface appearance as well as the use of the possibility of diversification, good corrosion resistance, long-term durable than ordinary steel corrosion resistance, high strength, and thus the sheet to use the possibility of high temperature oxidation and high strength, resistance to fire at room temperature processing, namely easy to plastic processing because do not have to surface treatment, so easy, maintenance simple and clean finish high welding performance 
Quality characteristics 
2-1 of stainless steel quality characteristics 
2-2 quality characteristics of the stainless steel requirements 
The product due to the different purposes of their processing technology and quality requirements of raw materials. 
2-3 quality requirements characteristics of micro-projects 
   (1) Material: 
① DDQ (deep drawing quality) material: refers to the deep drawing (red) use of materials, also said the soft material, this material is characterized by high elongation (≧ 53%) than the hardness low (≦ 170%), internal grain grading between 7.0 ~ 8.0, deep red excellent performance. Many production thermos pot class enterprises, the processing of their products than (the SIZE BLANKING / products diameter) are generally higher, and their processing up to 3.0,1.96,2.13,1.98. SUS304 DDQ wood is mainly used for processing these requests higher than the product, of course, to complete the processing than the product of more than 2.0 generally takes a few times a stretch. If the raw material extension of the terms of the reach of words, products in the processing of deep drawing products easily cracks, pull wear phenomenon, affecting product qualified rate, of course, also increase the cost of the factory; 
② general material mainly used for materials in addition to DDQ uses of this material is characterized by relatively low elongation (≧ 45%), while the hardness is relatively high (≦ 180), internal grain size grades from 8.0 to 9.0 with DDQ material compared to its deep-drawing performance is relatively little worse, it is mainly used for products can be obtained without thrust, like a tableware spoon, spoons, forks, electrical appliances, steel use. With DDQ material has an advantage, that is, the BQ of relatively good, mainly due to its hardness higher reason. 
       (2) Surface quality: 
Stainless steel sheet is a very high price of materials, the surface quality requirements of the customers it is also very high.Stainless steel sheet in the production process will inevitably be a variety of defects such as scratches, pitting, creases, pollution, and thus the quality of its surface, like scratches, creases, etc. These defects regardless of advanced materials or junior not allowed, pitting this defect in the spoon, spoon, fork, making never allow, it is difficult to discard because of polishing. According to the degree and frequency of the surface of a variety of defects, to determine the rating of the quality of its table, so as to determine the product level. 

       (3) Thickness tolerance: 
In general, the different stainless steel products, their requirements also vary material thickness tolerance, like two types of cutlery and insulated cup, the thickness tolerance is generally higher for the -3 to 5%, while a class cutlery thickness tolerance General requirements - 5%, steel pipe, requirements -10% for hotel refrigerator with material thickness tolerance requirements for 8%, dealer requirements for thickness tolerances are generally 4% to 6%. Export products can lead to different requirements of customers for raw materials thickness tolerance. The thickness tolerance of the general export products customers are higher, while domestic business-to-thickness tolerance requirements are relatively low (mostly because of cost considerations), and some customers even require -15%. 
(4) Welding: 
The products use different welding performance requirements also vary. A class of cutlery on the welding performance is generally not required part of the pot and even enterprises. However, the vast majority of products require good welding properties of raw materials, like second-class tableware, mug, steel pipes, water heaters, drinking fountains. 
(5) Resistance to corrosion: 
Most stainless steel products require good corrosion resistance, like a second class tableware, kitchen utensils, water heaters, drinking fountains, etc., some foreign businessmen to do the corrosion resistance test of the product: the NACL aqueous solution heated to boiling, pour a period of time out of solution, washed and dried, the weight loss determined by the extent of corrosion (Note: Product polishing with emery cloth or sandpaper, with the composition of Fe, will lead to the test surface rust) 
(6) Polished performance (BQ): 
Stainless steel products in the production are generally polished in this process, only a few products such as water heaters, water dispenser liner does not need polishing. So good polishing performance of which requires raw materials. The main factors affect the polishing performance of the following: 
① raw materials surface defects. Such as scratches, pitting, over pickling. 
② raw material problem. The hardness is too low, the polishing is not easy to throw light (BQ poor), and the hardness is too low in the deep drawing surface prone to orange peel phenomenon, which affects the BQ property. The high hardness of the BQ of relatively fine. 
The ③ deep drawing products, deformation with large amounts of regional surface will be a small black spots and RIDGING thus affecting BQ.