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: XG835NH
Specifications: φ5.5~40mm
Applied Standard:  agreement
Characteristics: This product is mainly used to produce weathering steel fasteners of class 10.9.
Applications: Fastener steel
Use of Products: XG835NH has characteristics of uniform-chemical composition, low percentage of harmful elements, high hardenability ,good surface quality. It is a new type of weathering steel.IT has low corrosion rate,and can be used without coating.