Cold-rolled strip steel straight 7mm spot, Ding Ding cold rolled, 7mm cold-rolled strip steel straight 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. Cold-rolled ribbed steel: manufacture of steel wire rod should be consistent with GB / T 701, GB / T 4354 or other relevant standards. Delivery status reinforced by the cold state of delivery. Cryogenic tempering process allows cold rolling. Cold-rolled ribbed steel surface quality: the steel surface without cracks, folds, scars, oil and other effects of the use of the defects. Steel surface rust may have 7mm cold-rolled strip steel manufacturer directly, but should not rust leather and visual visible corrosion pits or the like. 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).