97超碰人人澡人人,久久久一区二区,亚洲天堂色图片,7777精品伊人久久久大香使用方法,国产午夜一区,日韩av中文字幕一区二区,国产黄色大片儿

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.