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

精品成人一区二区三区四区| аⅴ资源中文在线天堂| 国产成人一区二区无码不卡在线| 久久天天躁夜夜躁狠狠躁2014| 狠狠躁夜夜躁无码中文字幕 | 久久国产精品久久久久久| 久久人人爽人人爽人人片ⅴ| 人妻互换精品一区二区| 国产激情久久久久久熟女老人| 成人婷婷网色偷偷亚洲男人的天堂| 日本又黄又爽gif动态图| 日本无遮挡吸乳呻吟视频| 狠狠色丁香婷婷久久综合| 99久久国产综合精品五月天喷水| 国产极品美女高潮无套| 日本熟妇色xxxxx日本免费看| 白嫩少妇bbw撒尿视频| 毛色毛片免费观看| 亚洲av无码一区二区三区鸳鸯影院| 亚洲av午夜福利精品一区二区| 亚洲av无码国产在丝袜线观看| 国产激情无码一区二区三区| 十八禁无遮挡99精品国产| 亚洲欧洲无码一区二区三区| 国产成人精品男人的天堂| 初音未来爆乳下裸羞羞无码| 午夜爽爽爽男女免费观看hd| 国产精品无码一区二区在线看| 人妻有码中文字幕在线| 精品久久久久久久久久久国产字幕| 日韩欧美在线综合网| 国产精品成熟老女人| 精品深夜av无码一区二区| 天天爽天天爽天天爽| 综合色就爱涩涩涩综合婷婷| 亚洲综合一区二区三区四区五区| 久久久精品2019免费观看| 精品人妻av一区二区三区| 国模无码一区二区三区不卡| 亚洲精品国产suv一区88| 国产肥熟女视频一区二区三区|