成人做爰高潮a片免费视频,国产精品一区二区毛卡片,亚洲av精品无码国产一区,怎么找附近的寂寞少妇

Service Hotline
086-577-86923687
Current Location:Home - News - Products Knowledge
Stainless steel head performance in the heating and cooling process
Release Time:2011-09-02  Views :
Stainless steel head in the heating and cooling process, the cooling rate is inconsistent surface and center and time, forming temperature, resulting in volume expansion and contraction of the uneven stress that the heat stress. Stainless steel head under the effect of thermal stress due to a temperature below the surface began to core section, leaving the central portion is greater than the contraction also central portion tension, when the end of the cooling, since the cooling core section final volume shrinkage can not freely leaving the surface layer by Ministry press center of tension. That is under the influence of thermal stress and finally to the workpiece surface pressure and heart Ministry tension. This phenomenon is cooled velocity, material composition and heat treatment and other factors.
 
When cooled, the faster, the higher the carbon content and alloy composition, inhomogeneous plastic deformation of the cooling process in the thermal stress generated by the larger, the final form of the residual stress is greater.
On the other hand the steel during heat treatment due to the change in the organization that is the transformation of austenite to martensite, accompanied by the increase of the specific volume of the volume expansion of the workpiece, the various parts of the workpiece has a phase change, resulting in inconsistency of the volume of tissue grown stress.
 
The end result stainless steel head the surface tissue stress is tensile stress, the heart portion compressive stress, and thermal stress exactly the opposite. The stress in the workpiece size and cooling rate of martensite transformation zone factor, shape, chemical composition of the material.
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

欧美肥胖老太玩黑人| 姐姐的朋友电影| 中文字幕乱码中文字乱码| 特黄把女人弄爽又大又粗| 艳妇乳肉豪妇荡乳AV无码福利| 女女互揉吃奶揉到高潮视频| 被侍卫g到c吹的皇后| 国产精品99久久久久久动态图| 色综合久久久无码中文字幕波多 | 久久人人爽人人片AV人成| 湿润手指揉捏调教h女友| av视频在线观看| 女人巨大荫蒂勃起| 国精产品999一区二区三区有限| 亚洲人成色777777精品| 苍井空电影| 黄色电影网站| 精品人妻无码一区二区三区牛牛| 亚洲av无码成人精品区| 自拍 亚洲 综合 另类小说| 亚洲暴爽av天天爽日日碰| 男男gv资源chinese18| 啊灬啊灬啊灬快灬高潮了| 年轻丰满的继牳4伦理| 国产97人人超碰cao蜜芽| 母亲とが话しています免费| 各种各色bb小便| 日本三级片电影| 日本无码视频| 双性受抽搐潮喷调教老师与学生| 性欧美乱熟妇xxxx白浆| 欧美黑人又粗又大的性格特点| 白嫩光屁股bbbbbbbbb| 性乌克兰18videos少妇| 精品人妻中文无码av在线| 亚洲蜜芽在线观看精品一区| 办公室的交易HD在线观看| 男生和女生一起打扑克| 我的邻居是bj无删减漫画免费看| 亚洲精品久久久久久久蜜桃| 把女人弄爽特黄a大片视频 |