精品久久久久久亚洲综合网,吃奶呻吟打开双腿做受动态图,亚洲色精品三区二区一区,久久精品国产一区二区三区不卡,无码AV免费永久免费永久专区,亚欧AV无码乱码在线观看性色,特别精品毛片免费观看,午夜精品久久久内射近拍高清,黄A无码片内射无码视频,国产乱子伦农村叉叉叉

<abbr id="6iawu"></abbr>
<tfoot id="6iawu"><rt id="6iawu"></rt></tfoot>
  • <fieldset id="6iawu"><table id="6iawu"></table></fieldset>
  • <del id="6iawu"><dfn id="6iawu"></dfn></del>
  • <cite id="6iawu"><table id="6iawu"></table></cite>
    <del id="6iawu"></del>
    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

    国产精品成熟老妇女| 国产精品欧美在线观看| 国产精品性色av免费| 国产成人一区二区三区视频免费| 国产一区二区久久不见| 尤物午夜福利视频| 精品一区高清AV| 久久亚洲精品无码播放| 日韩A级成人免费无码视频| 男人午夜a天堂一区二区三区| 欧美有码在线| 人妻影音先锋啪啪AV资源| 2021国产在线视频| 免费国产高清精品一区在线| 无套内谢少妇一二三四| 亚洲一区av在线蜜臀| 日韩视频免费| av免费一区二区三区不卡| 欧洲成人在线观看| 色屁屁WWW影院免费观看入口| 九色在线观看视频| 日韩欧美91| 国产女人高潮视频在线观看| 国产三级精品三级在线观看粤语| 亚洲欧美日产综合在线网| 国产一区二区视频看看| 丰满少妇内射一区| 亚洲精品综合网二三区| 精品国产成人av在线| 久久人人爽人人爽人人片AV超碰| 强奷白丝美女在线观看| 毛片资源精品在线观看| 日韩一级黄色片天天看| 男人天堂av免费观看| 国产福利一区二区在线观看| 青青草视频在线视频播放| 在线欧美日韩国产| 天天躁日日躁狠狠躁中文字幕| 一本精品99久久精品77| 成人国产一区二区三区| 狠狠色狠狠色综合网|