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      1. 国产黄色av网址,在线视频?制服?中文,欧美日韩a,亚洲自拍偷拍一区,中文字幕+乱码+中文字幕一区,国产av制服丝袜,av高清无码,嫩草亚洲小泬久久夂
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        086-577-86923687
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        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
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        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
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