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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新聞資訊
冷拉圓鋼有沒有Q235材質的？執行的標準是什么
發布時間：2019-11-18 17:33??禁止復制或轉載本站任何內容，特此聲明！??點擊：
冷拉鋼
有拉制標準《冷拉圓鋼、方鋼、六角鋼（GB／T905-1994）》此標準屬于尺寸規格標準，材質不受限制，拉制時達到標準要求即可。冷拉鋼有Q235材質。
Q235-B的圓鋼生產標準:
外部標準為：GB/T 709-2006 《熱軋鋼板和鋼帶的尺寸、外形、重量及允許偏差》；
內部標準為：GB/T 3274-2007《碳素結構鋼和低合金結構鋼熱軋厚鋼板和鋼帶》。
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