Steel surface quality: the steel surface shall be allowed to have cracks, scars and folds. Steel surface bumps are allowed, but must 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 5.5mm steel stock, content differences, and which is generally in the range of: C ( 0.10 ~ 0.40%), Mn <1.80%, P <0.050%, S <0.050%, Si (0.60 ~ 1.00%). There are two kinds of steel commonly used classification methods: First, the geometry of the classification, according to the cross-sectional shape of the ribs and rib spacing or classify different type 5.5mm steel, such as the British Standard (BS4449) in 5.5mm steel production plant, the rebar into type Ⅰ, Ⅱ type. This classification performance of the main reaction clenched rebar. Second, the performance classification (class), such as our current performance standards, rebar (G B1499.2-2007) wire for the 1499.1-2008), press the intensity level (yield point / tensile strength) into rebar three grades. 5.5mm steel manufacturer, 5.5mm steel, cold-rolled by Ding Ding Ding Ding Industrial Co., Ltd., Henan Province. Ding Ding Industrial Co., Ltd., Henan Province (www.hnddsy.com) strong, credible, and other industries in other Anyang accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Dingding cold rolling and you hand into the brilliant, for a better future!