h成人动漫在线观看_91麻豆最新网址_人妻推油中文字幕组_欧美美女自慰影院_国产 刺激 高潮 免_一本一道精品欧美中文字幕_国产精品视频啪啪啪_日本在线免费播放_日韩三级视频在线_亚洲国产成人精品久久综合区

The hot-rolled precision steel pipe is made of continuous casting round tube billet slab or pre-rolled slab as raw material, heated in a walking furnace, descaled by high-pressure water, and then enters the rough rolling mill. , implement computer-controlled rolling, and after final rolling, it is coiled by laminar flow cooling and coiling machine to become straight hair rolls. The head and tail of the straight hair curler are often tongue-shaped and fish-tail-shaped, with poor thickness and width accuracy, and the edges often have defects such as wave shape, folded edge, and tower shape. The coil weight is heavier, and the inner diameter of the steel coil is 760mm. After the straight hair coil is processed by cutting head, tail cutting, edge trimming and multi-pass straightening, leveling and other finishing lines, it is then cut or re-coiled to become: hot-rolled steel plate, flat hot-rolled steel coil, longitudinal Tape and other products. If the hot-rolled finishing coil is pickled to remove the oxide scale and oiled, it becomes a hot-rolled acid-washed coil.