av永久免费观看,日韩在线精品视频,在线观看国产视频,国产精品久久片,国产毛片av网站,国产又粗又硬又黄又刺激,国产黄色片视频

Main Products
Products Grade: SCM420
Specifications: φ5.5~38mm
Applied Standard:  agreement
Characteristics: It's used to produce the engine vavle push rod.
Applications: Common partsCommon fastener
Use of Products: This product has characteristics of uniform-chemical composition, low percentage of harmful elements, high purity, good surface quality. After spheroidize annealing, this product has the characteristics of good cold heading properties. And the product has excellent hardenability.