• <del id="m2ir1"><option id="m2ir1"><tr id="m2ir1"></tr></option></del>
  • <sup id="m2ir1"><rt id="m2ir1"></rt></sup>

    <blockquote id="m2ir1"><p id="m2ir1"></p></blockquote>

  • <big id="m2ir1"></big>

    久久久无码精品国产一区,玩中年熟妇让你爽视频,精品丰满人妻无套内射,日本xxxx片免费观看,欧美日韩中文字幕视频不卡一二区,欧美日韩综合精品一区二区,正在播放国产多p交换视频,中文 在线 日韩 亚洲 欧美
    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: 日产电影一区二区三区| 女性自慰网站免费观看w| 丝袜无码一区二区三区| 日日摸夜添夜夜夜添高潮| 亚洲欧美成人久久一区| 欧美制服丝袜人妻另类| 亚洲国产一卡2卡3卡4卡5公司| 免费看久久妇女高潮a| 国产亚洲精品一区二区三区| 特黄三级又爽又粗又大| 人妻少妇无码精品视频区| 强制高潮18xxxx按摩| 国产精品久久久久不卡无毒 | 免费无码av污污污在线观看| 国产成人 综合 亚洲欧洲| 国产+成+人+亚洲欧洲自线| 亚洲第一aaaaa片| 人人妻人人做人人爽| 亚洲国产成人久久综合碰| 国产成人av一区二区三区在线观看| 亚洲一区二区三区在线观看精品中文| 性色香蕉av久久久天天网| 少妇夜夜春夜夜爽试看视频| 精品午夜福利1000在线观看| 狠狠色丁香久久婷婷综合_中| 国产精品久久久久无码人妻精品| 18禁裸男晨勃露j毛网站| 亚洲国产精品无码专区成人| 欧美日韩国产综合新一区| 在线亚洲韩国日本高清二区| 大伊香蕉精品一区二区| 久久亚洲国产精品影院| 亚洲妇熟xxxx妇色黄| 日躁夜躁狠狠躁2001| 亚洲同性男网站| 亚洲大尺度无码无码专线一区 | 成人免费毛片内射美女app| 国产美女被遭高潮免费视频| 久青草久青草视频在线观看| 韩国v欧美v亚洲v日本v| 中文无码不卡的岛国片|