性爱无码高清电影|亚洲第一播放器|国产精品日日摸夜夜摸添孕妇|日本在线不卡免费|日韩A片大全在线观看|国产精品Av在线观看|欧美日韩另类一级二级|国产一区二区三区高清无码|成人网站在线观看视频|TS女神第一福利视频

"The [revision] has been forwarded to the Standardization Administration of China and is very likely to be formally released in September," the CISRI official, who was involved in the drafting of the document, told Metal Bulletin. The new standard is an improved edition of the GB 1499.2-2007 and proposes to eliminate the 335MPa strength rebar, replacing it with a 600MPa strength rebar, to increase rebar grades with earthquake resistance. The CISRI official also noted that China produces approximately 160 million tonnes of hot-rolled high strength steel rebar, including HRB400 (65%), HRB500 (20%) and other products (15%). "The [required] amount of vanadium to be added is 0.03-0.05% for HRB400 and 0.05-0.08% for HRB500, so the demand growth of vanadium metal will be around 10,000 tonnes per year," the official added.