Steel surface quality: the steel surface shall be allowed to have cracks, scars and folds. Steel surface allows bump 5.5mm steel, but shall not exceed the height of the transverse ribs, other defects on the steel surface depth and height shall not exceed the size of the site where the allowable deviation. Rebar component test: Ingredients: Indicator assessment rebar ingredients are mainly: C, Mn, P, S, Si other items, different grades of rebar spot 5.5mm, 5.5mm difference in the content of each steel production plant, its approximately in the range of: C (0.10 ~ 0.40%), Mn <1.80%, P <0.050%, S <0.050%, Si (0.60 ~ 1.00%). Steel specification: steel straightening should be adopted and cold drawn mechanical straightening straightening method. For a small amount of crude steel, does not have the machinery when the straightening and cold-drawn straight condition, can be artificial straightening. Methods such as the use of cold-drawn straight, its long straight stretch of cold rate of not more than 1%. For Ⅰ grade steel 5.5mm steel manufacturers, in order to remove scale, the cold in cold-drawn straight while pulling rate may be appropriate to increase, but not more than 2%. Wholesale 5.5mm steel, cold-Ding Ding, 5.5mm steel provided by Ding Ding Industrial Co., Ltd., Henan Province. Ding Ding Industrial Co., Ltd., Henan Province (www.hnddsy.com) is Anyang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In cold-Ding Ding leadership with the staff warmly welcome all inquiries negotiations to create a better future for cold-Ding Ding.