国产日韩欧美高清-亚洲精品乱码-97人人模人人爽人人少妇-少妇裸体挤奶汁奶水视频-黑人操日本女人视频-欧美h版电影在线观看-激情视频国产-午夜一区二区视频-午夜电影在线播放-国产精品久久久久国产a级-精品熟女碰碰人人a久久-茄子视频懂你更多在线观看-久久性生活-久久不卡av-欧美人与性动交α欧美精品-高清午夜福利电影在线-久久网中文字幕-中文字幕免-www五月婷婷-日韩一级黄色
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冷拔鋼管的工藝流程介紹
發(fā)布時間：2019-11-18 17:35??禁止復制或轉載本站任何內容，特此聲明！??點擊：
冷拔鋼管是鋼管的一種，熱軋鋼管用連鑄板坯或初軋板坯作原料，經步進式加熱爐加熱，然后在進行高壓水除鱗進入粗軋機，把粗軋料切頭、尾、再進入精軋機，實施計算機 控制軋制，終軋后即經過層流冷卻和卷取機卷取、成為直發(fā)卷。
直發(fā)卷的頭、尾往往呈舌狀及魚尾狀，厚度、 寬度精度較差，邊部常存在浪形、折邊、塔形等缺陷。 其卷重較重、鋼卷內徑為760mm。(一般制管行業(yè)喜歡使用。)將直發(fā)卷經切頭、 切尾、切邊及多道次的矯直、平整等精整線處理后，再切板或重卷，即成為：熱軋鋼板、平整熱軋鋼卷、縱切帶等產品。熱軋精整卷若經酸洗去除氧化皮并涂油后即成熱軋酸洗板卷。該產品性能優(yōu)良，價格適中，漸漸成為該行業(yè)的熱銷品。
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