Cold-rolled ribbed steel cold rolling specifications _ Dingding (certified) _ Henan ribbed steel provided by Ding Ding Industrial Co., Ltd., Henan Province. Ding Ding Industrial Co., Ltd., Henan Province (www.hnddsy.com) is a professional enterprise, "cold-rolled ribbed steel CRB550", the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Liu. Especially cold-rolled ribbed steel bars welded mesh three ribbed steel, suitable for highway pavement, airport runways, large diameter sewer, drainage tunnels. Cold-rolled ribbed steel bars in overseas mostly in the form of mesh. Our industry standard "welded steel technical specification for concrete structures" JGJ / T114─97 been implemented. With the industrialization of China's construction standards to improve cold-rolled ribbed steel specifications, welded steel applications will be gradually increased. Many different types of steel, usually by chemical composition, production process, rolling shape, supply form, diameter, as well as use in the structure classification. Divided by the diameter steel wire (diameter 3 ~ 5mm), fine steel (diameter 6 ~ 10mm), crude steel (diameter greater than 22mm). Divided by the mechanical properties of steel grade Ⅰ (300/420 level); Ⅱ grade steel (335/455 level); Ⅲ grade steel (400/540) and Ⅳ grade steel (500/630).