国内精品久久久久久久日韩,成人国产视频在线观看,亚洲精品国产一区二区,少妇一级淫片免费放在线,视色av,国产精品美女久久久av,蜜桃av网站

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.