性高湖久久久久久久久,大肉大捧一进一出好爽视色大师 ,a级毛片在线观看,欧美成人在线视频

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

亚洲成av人片一区二区密柚| 99在线精品免费视频九九视| 与子敌伦刺激对白播放| 久久99国产综合精品| 三级全黄的视频在线观看| 亚洲av无码一区东京热| 国产婷婷色综合av蜜臀av| 无码人妻丰满熟妇啪啪| 丝袜 中出 制服 人妻 美腿| 香港三日本8a三级少妇三级99 | 国产国产裸模裸模私拍视频| 天堂а√在线中文在线新版| 色一情一乱一伦一视频免费看| 国产超碰人人爽人人做| 國产一二三内射在线看片| 国色天香精品一卡2卡3卡4 | 亚洲国产精品无码久久一线| 久久夜色撩人精品国产小说| 亚洲精品97久久中文字幕无码| 久久国产劲爆∧v内射| 久久人与动人物a级毛片| 精品久久久无码人妻字幂| 首页 综合国产 亚洲 丝袜 | 成人麻豆日韩在无码视频| 午夜射精日本三级| 欧美成人看片一区二区三区尤物| 国产女人水真多18毛片18精品| 肉体裸交137日本大胆摄影| 国产av旡码专区亚洲av苍井空| 377p日本欧洲亚洲大胆张筱雨| 中文字幕乱码熟女人妻水蜜桃| av狠狠色丁香婷婷综合久久| 日韩精品视频一区二区三区| 狂野欧美性猛xxxx乱大交| 黄网站欧美内射| 亚洲日韩精品无码av海量| 精品999日本久久久影院| 大地资源免费更新在线播放| 国产精品久久久久久超碰| 一色屋精品视频在线观看| 天堂中文在线资源|