精久国产av一区二区三区孕妇,国产免费不卡午夜福利在线,无码久久久久不卡网站,国产成人a在线观看视频免费

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

欧洲vat一区二区三区| 又大又粗又爽的少妇免费视频| 国产成人精品999视频| 日韩插啊免费视频在线观看| 国产精品成人99久久久久| 在线精品一区二区三区| 国产 在线 | 日韩| 极品粉嫩国产18尤物在线观看| 嫩草伊人久久精品少妇av| 国产精品久久久久久熟妇吹潮软件 | 18禁无遮挡免费视频网站| 日本不卡一区| 免费吃奶摸下激烈视频| 午夜精品一区二区三区在线观看| 亚洲人成网站在小说| 18禁床震无遮掩视频| 人妻有码中文字幕在线| 中文字字幕在线中文无码| 在线观看无码av网站永久| 久久av高潮av无码av喷吹| 亚洲欧美日韩中文播放| 国产精品久久久久久52avav | 99这里有精品热视频| 99国产精品久久久蜜芽 | 国产精品久久久久久人妻无| 人妻人人澡人人添人人爽人人玩| 888亚洲欧美国产va在线播放| 国产精品卡一卡二卡三| 国产午夜精品一区二区三区极品| 欧美精品黑人粗大免费| 欧美黑人性暴力猛交高清| 西西午夜无码大胆啪啪国模| 一本无码字幕在线少妇| 精品欧美乱码久久久久久1区2区| 国产蝌蚪视频一区二区三区| 国产av国片精品| 亚洲精品无码久久久久y| 亚洲欧美中文字幕5发布| 成年无码av片在线狼人| 3d动漫精品一区二区三区| 免费无码观看的av在线播放|