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(guó)強(qiáng)和茂管材有限公司

Sinupower Heat Transfer Tubes Changshu Ltd.
CN EN

400-100-7068

+ 微信號(hào):WEIXINHAOMA

Your location : Home > News > Industry Dynamics

What are the heat treatment methods for precision aluminum tubes?

Source:en      Release date: 2022-05-17
Information summary:The precision aluminum tube is heated by different heat sources, and cooled when the surface temperature of the workpiece reaches above the critical point, so that the surface layer obtains a hardened structure while the core still maintains the original structure. The most common industrial applications are induction heating and flame heating surface quenching
1. Surface quenching
          heats the precision aluminum tube through different heat sources, and cools it when the surface temperature of the workpiece reaches above the critical point, so that the surface layer obtains a hardened structure while the core still maintains the original structure. The most common industrial applications are induction heating and flame heating surface quenching.
          2. Chemical heat treatment
          The product is heated and kept warm in a medium containing active elements, so that the active atoms in the medium penetrate into the surface of the product or form a covering layer of a certain compound to change the structure and chemical composition of the surface layer, so that the surface of the workpiece Has mechanical or physicochemical properties.
          3. Contact resistance heating and quenching
          : A voltage of less than 5 volts is applied to the precision steel pipe through the electrode, and a large current flows through the contact between the electrode and it, and a large amount of resistance heat is generated, so that the surface is heated to the quenching temperature, and then the electrode is heated to the quenching temperature. Removed, the heat is introduced into the product and the surface is cooled, that is, the purpose of quenching is obtained.
          4. Electrolytic heating and quenching
          is placed in the electrolyte of acid, alkali or salt aqueous solution, the product is connected to the cathode, and the electrolytic cell is connected to the anode. After the direct current is turned on, the electrolyte is electrolyzed, oxygen is released on the anode, and hydrogen is released on the precision steel pipe. Hydrogen forms a gas film around the product and becomes a resistor body to generate heat, heat the surface to the quenching temperature, and then cut off the power, the gas film disappears, and the electrolyte becomes a quenching medium, which cools and hardens the surface.
成人福利国产精品视频| 国内永久福利在线视频| 在线亚洲专区高清中文字幕| 国产一区二区三区成人欧美日韩在线观看| 国产精品亚洲一区二区在线观看 | 亚洲综合欧美色五月俺也去| 国产亚洲日韩欧美一区二区三区| 娇妻被打开双腿灌满白浆一区| 亚洲熟妇无码av| 中国人与黑人牲交free欧美| 伊人天堂av无码av日韩av| 亚洲国产成人综合在线不卡| 国产产区一二三产区区别在线| 亚洲国产精品久久久久久久 | 国产丶欧美丶日本不卡视频| 天堂中文官网在线| 国产不卡视频一区二区三区| 亚洲av无码成人黄网站在线观看| 无码人妻h动漫| 乱中年女人伦av一区二区| 成人做受120视频试看| 黄又色又污又爽又高潮动态图| 亚洲AV无码一区二区三区天堂古代| 在线精品亚洲一区二区| 男人女人做爽爽18禁网站| 国产免费人成视频在线观看| 西西444www无码大胆| 国产精品无码不卡一区二区三区| 日本韩国男男作爱GAYWWW| 亚洲成A人在线看天堂无码| 三叶草欧洲码在线| 亚洲精品中文字幕无码专区一| 1000部啪啪未满十八勿入| 国产av无码专区亚洲精品| 欧美在线 | 亚洲| 国产精品一亚洲AV日韩AV欧| 欧美大肥婆大肥bbbbb| 东京热人妻一区二区三区| 国产日韩欧美| 人妻精品动漫H无码中字| 99无码熟妇丰满人妻啪啪|