不卡视频一区二区三区,婷婷成人av,国产精品一区视频,久久夜色精品国产噜噜av小说,国产精品性夜天天视频,亚洲日产永久经典,九九国产精品入口麻豆

Main Products
Products Grade: ML20Cr,GML20Cr-B、Q17Cr3-B
Specifications: φ5.5～40mm
Applied Standard:  GB/T6478,agreement
Characteristics: It's used to produce automobile and motorcycle accessories, and diesel engine vavle tappet.
Applications: Common partsCommon fastener
Use of Products: This product has characteristics of uniform-chemicalcomposition, low percentage of harmful elements, high purity, slight decarburisation, good surface quality. After spheroidize annealing, this product has characteristics of good cold heading properties ,stable heat-treatment properties and good hardenability.