国产精品久久久久久久久久免费动|久久久久免费精品国产|日日夜精品视频|黄色av地址,婷婷激情久久,亚洲美女高潮久久久,超碰在线三级

Main Products
Products Grade: 20CrMnTi
Specifications: Φ5.5-28 mm
Applied Standard:  GB/T 3077
Characteristics: The product is mainly used to produce gear and various kinds of machine-parts.
Applications: Common mechanical steel
Use of Products: By special process, gear steel has characteristics of uniform-chemicalcomposition, narrow temperature range for hardenability, fine grain size, high purity, good surface quality and excellent hot heading properties. It can meet the requirement of gear product.