久久久久久国产一区二区三区,天天狠天天操,国产乱码久久久久久一区二区,黄色短视频免费观看,日日噜噜夜夜爽狠狠视频 ,午夜激情啪啪,不卡的av电影在线

Main Products
Products Grade: 35VB
Specifications: φ16~38mm
Applied Standard:  agreement
Characteristics: The wire rod is used to produce high strength bolt for steel structure of class 10.9.
Applications: Common partsFastener steel
Use of Products: 35VB ,which is mainly used to produce high strength bolt for steel structure of class 10.9. has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality, good cold heading property,stable quality of heat treatment , good hardenability and uniform hardness.