中文字幕在线亚洲精品,国产精品www夜色视频,国产精品av在线,久久久久夜夜夜精品国产,国产做爰又粗又大又爽动漫,欧美人妻aⅴ中文字幕,亚洲av无码国产综合专区,国产又色又爽又黄的,亚洲熟妇自偷自拍另欧美,狠狠精品久久久无码中文字幕

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

久久精品性无码一区二区爱爱 | 又污又黄又无遮挡的网站| 中文字幕第一页亚洲观看| 亚洲精品中文字幕码专区| 人妻少妇偷人精品久久性色av| 免费a级毛片无码| 国产亚洲精品看片在线观看| 激情五月天俺也去综合网| 亚洲日本人妻少妇中文字幕| 国产va免费精品高清在线观看| 福利一区在线观看| av最新版天堂在资源在线| 亚洲国产中文字幕在线视频综合| 午夜福利av无码一区二区| 女同亚洲女同精品| 99久久免费中文字幕精品| 在线观看免费日韩精品| 亚洲精品suv精品一区二区| 国产91吞精一区二区三区 | 一区二区三区国产色综合| 99国产精品自在自在久久| 久草视频福利| av天堂手机一区在线| 国产狂喷水潮免费网站www| 黑人玩弄人妻中文在线| 久久精品美女久久| 美腿丝袜日韩在线观看| 久久精品国产精油按摩| 96免费精品视频在线观看| 青青青视频手机在线观看| 无码爽视频| 亚洲精品国偷自产在线99正片| 亚洲国产精品综合福利专区 | 国产激情在线观看免费视频| 欧美真人性野外做爰| 国产一区a| 免费人成网站在线观看| 老子影院午夜伦不卡| 日韩欧美亚洲综合久久影院d3 | 国产欧美日韩综合在线一区二区| 国产av一区仑乱久久精品|