国产欧美激情日韩成人三区|成A∨人片在线观看无码|91欧美精品午夜性色福利在线|亚洲一级黄色,男人的天堂久久久,久久综合操,国产超级乱淫视频播放免费

Main Products
Products Grade: ML20MnTiB、QML20MnTiB-C
Specifications: φ5.5~42mm
Applied Standard:  GB/T 6478
Characteristics: ML20MNTiB is mainly used to produce fasteners of class 10.9 and small size and moderate load gear and parts in cementite.
Applications: Fastener steel
Use of Products: ML20MnTiB is a common steel which is mostly used to produce fasteners of class 12.9. The product has characteristics of uniform-chemicalcomposition, low percentage of harmful elements, high purity, slight decarburization, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties ,stable heat-treatment properties, good hardenability and low grain-grow up tendency in cementite.