欧美黑吊大战白妞欧美大片-日批视频免费-超碰视屏-欧美一级特黄aaaaaa-日本午夜精品理论片a级app发布-人人干人人澡-午夜精品久久久久久久99黑人-男人与雌宠物交h-日韩成人免费在线-天天射夜夜爽-九一亚色-香蕉视频首页-一区二区三区视频免费在线观看-欧美日韩亚洲国产一区-久久这里有-我不卡av-婷婷综合在线视频-久久在线视频精品-国产蜜臀在线-午夜欧美成人

全國熱線服務:

FAQ 當前位置:首頁 > News > FAQ >

What is the culprit for the low hardness of high-precision cold-drawn tubes?

       Precision cold drawn pipe is a high-precision steel pipe material with good performance in terms of shape, size and performance. However, when testing precision cold-drawn tubes, it is found that its hardness does not meet the standard requirements and is on the low side. What is the reason for this?
 
       In addition, the cooling rate during the quenching process should also have a very large impact on the hardness of precision cold drawn tubes. Generally, the slower the cooling rate, the more the hardness of the product decreases. In order to avoid the occurrence of this kind of phenomenon, salt bath deoxidation must be strictly carried out, and the cooling temperature and time must be strictly controlled to achieve the best product.

上一篇:What are the options for the tempering process of high-precision cold drawn tubes?

下一篇:What are the design and fitting principles of honing tubes?