Cold rolled steel wholesale, Ding Ding cold rolled (certified), cold-rolled steel 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. Reinforced concrete structural members regardless of what Reinforcements cracks are allowed, but there is a limit to the width of the crack, so the specification design of reinforced concrete structural members should conduct width of crack. Cold-rolled ribbed steel technical specification for concrete structures crack width also gives the formula. Designed to reduce cold-rolled steel production line personnel troubles, regulations also clearly states: "Under normal indoor environment of reinforced concrete beam cold-rolled steel, when the concrete strength of not less than C20, bar diameter less then 10mm When the thickness of the protective layer of concrete and not more than 25mm, from time to maximum width of crack. " Welded into bonding and welding two forms. Steel flash butt welding (welding allows the use of two steel contact, low voltage, high current through twisted steel cold rolling production line, to be reinforced to be heated to a certain temperature to soften axial compression upset, the formation of the weld The head of reinforced flash butt welding process commonly used continuous flash welding, preheat flash welding and flash - preheat - flash welding on steel grade Ⅳ sometimes also energized after welding heat treatment.