久久中文字幕亚洲精品最新,在线观看成人年视频免费,成年免费视频播放网站推荐 ,亚洲精品蜜桃久久久久久,丰满人妻在公车被猛烈进入电影,黑人强伦姧人妻日韩那庞大的,av在线天堂av无码舔b,亚洲另类伦春色综合小说
      Service Hotline
      086-577-86923687
      Current Location:Home - News - Products Knowledge
      Comparison Process head cold and hot processing
      Release Time:2011-10-26  Views :
      Processing head is generally divided into cold and hot working are two, compare the following three aspects of the two paper processing head were:
       
      A, head cold material deterioration does not occur, especially suitable for processing stainless steel head;
      Thermal processing material deterioration will occur, resulting in decreased corrosion resistance of stainless steel head, stainless steel head is not suitable for processing.
      B, cold will not change the size of the contraction caused by cooling, regular shape, size, accuracy and consistency;
      Hot forming mold can cause thermal expansion and contraction of the cooling head, the size difference is difficult to control and consistency.
      C, to maintain the surface after head cold forming smooth surface of the original material, beautiful appearance.
      Surface oxide formed after thermal processing head of serious and difficult to remove.
      Key Words : 不銹鋼封頭
      Products
      Elliptical head
      Elliptical head
      Butterfly head
      Butterfly head
      Spherical head spin edge
      Spherical head spin edge
      Flat Head
      Flat Head
      Spherical head
      Spherical head
      Bow bottom head
      Bow bottom head
      Conical head
      Conical head
      Spherical cap shaped head
      Spherical cap shaped head
      Insulation panel
      Insulation panel
      Expansion Joints
      Expansion Joints
      Jacket (cylinder) rotation side
      Jacket (cylinder) rotation side
      Manhole flange
      Manhole flange
      NAVIGATION
      Wenzhou Shangshang Metal Products Co., Ltd.
      Add : 208,Zhanhong Road,Dushan,Longwan CentralIndustry,Wenzhou
      Tel : 086-577-86923687 85981288  Fax : 086-577-86913687
      All Rights Reserved © 2016 Wenzhou Shangshang Metal Products Co., Ltd    Zhejiang ICP No. 08,005,782
      • Follow Us

        Follow Us

      主站蜘蛛池模板: 久久99日韩国产精品久久99| 天干夜天干天天天爽视频| 中文国产日韩欧美二视频| 精品视频在线一区| 好了av四色综合无码| 香蕉久久久久久av综合网成人| 中文永久免费观看| 国产zzjjzzjj视频全免费| 99热国产这里只有精品9| www.色com| 在线中文字幕第一页| aaaaa少妇高潮大片| 精品服丝袜无码视频一区| 91.xxx.高清在线| 成人做爰69片免费看网站| h人成在线看免费视频| 国精产品一区一区三区免费视频| 国产素人在线| 色哟哟精品视频在线观看 | 成人午夜爽爽爽免费视频| 日韩欧美一级大片| 狠狠摸狠狠澡| 国产黄| 图片区 小说区 区 亚洲五月| 无码人妻aⅴ一区二区三区69岛| 欧美交换配乱吟粗大免费看| 日韩欧美一区二区三区四区| 国产成人精品一区二区无 | 成人毛片18女人毛片| 日韩在线三区| www成人国产高清内射| 图片区小说区视频区综合| 无人在线观看高清视频 单曲| 国产色秀| 日韩高清亚洲日韩精品一区| 亚州中文字幕午夜福利电影| 污视频网站免费看| 亚洲av成人一区在线| 成人午夜无码精品免费看| 天堂а√在线中文在线新版| 中文字字幕第183页|