日本黄色一区二区三区视频,不打码在线观看一区二区三区视频,久久黄色蜜桃av一区,午夜一区二区三区在线视频,精品蜜桃视频在线观看,毛片av中文字幕一区二区,久久伊人网久久伊人网,国产盗摄老熟女视频一区二区三区,少妇爽到爆视频网站免费,亚洲色图视频在线播放

        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

        亚洲国产日韩精品综合| 久久久久人妻精品一区蜜桃网站| 亚洲一区二区日韩欧美gif| 国产乱论视频| 蜜桃av多人一区二区三区| 国产稚嫩高中生呻吟激情在线视频| 免费观看性行为视频的网站| 精品国产aⅴ一区二区三区| 国产精品日韩中文字幕| 色偷偷色噜噜狠狠成人免费视频| 亚洲欧美高清一区二区三区| 精品卡一卡2卡三卡四卡乱码| 日本人妻免费在线视频| 成全影视大全在线看免费高清| 18禁高潮出水呻吟娇喘蜜芽| 熟妇与小伙子露脸对白| 高清国产va日韩亚洲免费午夜电影| 中文字幕亚洲人妻系列| 欧美肥妇毛多水多BBXX| 漂亮人妻被黑人久久精品| 亚洲一区二区三区无码影院| 手机在线中文字幕国产| 亚洲精品熟女乱色一区| 人人爱天天做夜夜爽| 国产午夜不卡| 亚洲永久免费网站| 超碰在线人妻免费福利| 艳女性享受在线观看| 天堂av在线观看免费| 国产成人乱码一区二区三区在线| 国产拍揄自揄精品视频网站| 制服丝袜一区| 在线一区二区三区人妻| 男女动态无遮挡动态图| 国产草草影院18成年视频| 91在线免费公开视频| 国产精品香蕉在线观看不卡| 午夜男女爽爽影院免费视频| 国产成人高清精品亚洲| 韩国美女主播国产三级| 国产很色很黄很大爽的视频|