免费无码国产免费172,日韩美女啪啪不卡视频,免费顶级欧美熟妇高潮xxxxx,竹菊影视一区二区在线

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.