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

国产精品久久人妻互换| 男女裸交免费无遮挡全过程| 国产精品亚洲综合色区韩国| 久久综合给合久久97色| 性xxxxx欧美极品少妇| 国产精品vⅰdeoxxxx国产| 偷窥xxxx盗摄国产| 午夜福利理论片在线观看播放| 国产午夜高潮熟女精品av| 欧美人禽杂交狂配| 开心五月激情综合婷婷色| 精品久久久久久久免费人妻| 国产精品久久自在自线不卡| 国产做床爱无遮挡免费视频| 亚洲aⅴ永久无码一区二区三区| 国产精品毛片无遮挡| 亚洲综合色区在线播放2019| 人妻无码久久一区二区三区免费| 成年女人毛片免费视频| 色欲久久久天天天综合网| 国产精品午夜成人免费观看| 国精产品自偷自偷综合下载 | 免费看一区无码无a片www| 中文字幕亚洲一区二区va在线 | 午夜福利理论片在线观看| 熟睡人妻被讨厌的公侵犯深田咏美| 国产成人精品一区二区在线小狼 | 久久精品亚洲一区二区三区浴池| 日本大肚子孕妇交xxx| 苍井空一区二区波多野结衣av | 狠狠色综合7777久夜色撩人 | 888亚洲欧美国产va在线播放| 亚洲av无码精品色午夜app | 午夜美女裸体福利视频| 精品久久久久久久久久中文字幕 | 综合激情五月丁香久久| 国产女人的高潮国语对白 | 伊人久久一区二区三区无码| 在线视+欧美+亚洲日本| 精品国产免费第一区二区三区| 麻豆 美女 丝袜 人妻 中文|