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: 304B,304HC
Specifications: φ5.5~11mm,φ5.5~24mm
Applied Standard:  agreement
Characteristics: stainless steel fastener.
Applications: Stainless steel fasteners
Use of Products: 304B,304HC is similar with 304, but regulate the Cr content and add Cu element.adding Cu not only can keep same corrosion resistance with 304 but also can improve other properties, it is benefit for drawing and forming.