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自1988年起,四川省建研院对LL650、LL800级冷轧带肋钢筋应用技术开展了研究工作,已分别于91年、92年通过技术鉴定。LL800级冷轧带肋钢筋应
Since 1988, Sichuan Academy of Engineering has carried out research work on the application technology of LL650 and LL800 grade cold-rolled ribbed steel bars and has passed technical appraisals in 91 and 92 years respectively. LL800 cold-rolled ribbed bar should be