精品久久久久国产免费,亚洲国产精品久久网午夜,被强到爽的邻居人妻完整版,免费无码的AV片在线观看

常熟國強和茂管材有限公司

Sinupower Heat Transfer Tubes Changshu Ltd.
CN EN

400-100-7068

+ 微信號:WEIXINHAOMA

Your location : Home > News > Company Dynamics

Main standard and material of precision bright tubes

Source:en      Release date: 2022-05-17
Information summary:Because the precision bright tube is a kind of high-precision steel pipe material that has been processed by fine drawing or cold rolling, because the precision bright tube has no oxide layer on the inner and outer walls, it can withstand high pressure without leakage, high precision, high finish, and no cold bending. Deformation, flaring, flattening without cracks, etc.
Because the precision bright tube is a kind of high-precision steel pipe material that has been processed by fine drawing or cold rolling, because the inner and outer walls of the precision bright tube have no oxide layer, it can withstand high pressure without leakage, high precision, high finish, no deformation after cold bending, expansion It is mainly used to produce pneumatic or hydraulic components, such as air cylinders or oil cylinders, which can be seamless tubes or welded tubes. The chemical composition of precision bright tubes is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.
   Main standards: GB/T3639, DIN2391-94/C, DIN2445, EN10305, DIN1630, DIN1629, ASTM A106, ASTM A179, JIS G3445.
   Main materials: 10#, 20#, 35, 45, 40Cr, 25Mn, 37Mn5, St35(E235), St37.4, St45(E255), St52(E355).
   The main purpose of the precision bright tube: automobiles, machinery parts and other machinery that have high requirements on the accuracy and smoothness of the steel tube. In 2--8 wires, many machining users are slowly converting seamless steel pipes or round steels into precision bright pipes in order to save labor, material and time losses.
国产精品久久久久国产a级| 亚洲av午夜精品一区二区三区| 亚洲精品97久久中文字幕无码| 中文字幕日本乱码仑区在线| 国产男女免费完整视频| 久久久久夜夜夜综合国产| 男女性杂交内射妇女bbwxz| 亚洲va中文字幕| 亚洲av日韩av永久无码下载| 人妻av无码一区二区三区 | 999国产精品999久久久久久 | 中文无码妇乱子伦视频| 在线亚洲专区高清中文字幕| 国产成人一区二区三区影院动漫| 成人亚洲欧美久久久久| 亚洲中文精品久久久久久不卡| 国产成人免费AV片在线观看| 国产av一区二区三区无码野战 | 大象一区一品精区搬运机器| 亚洲国产成人爱AV网站| 高潮爽死抽搐白浆gif视频| 97国产超碰一区二区三区| 亚洲色大成网站WWW久久九九| AV一本大道香蕉大在线| 色婷婷久久久swag精品| 后宫宫妃被各种sm调教| 又大又粗又爽又黄的少妇| 日韩国产精品无码一区二区三区| 制服中字人妻中字出轨中字| 久久午夜夜伦鲁鲁片无码免费| 人妻少妇精品视频三区二区一区| 国产综合色产在线精品| 久久精品国产亚洲av果冻传媒 | 精品国产乱码久久久久久蜜桃免费 | 中文字幕乱码在线播放| 三年在线观看免费大全下载| 成在线人免费视频| 欧美综合自拍亚洲综合图片区| 精品乱码一区二区三区四区| 国产AV丝袜旗袍无码网站| 丰满多毛的大隂户毛茸茸|