成人免费a视频,李雅在线观看一区国产,五月婷婷狠狠,精品国产自在2o18,狼伊人,五月天丁香婷婷网,久久亚洲精品无码观看不卡

Use of Products: SWRH18A and SWRCH22A are common steel which is mainly used to produce wall nail 、 self-tapping nail and fasteners of moderate or high strength. The product has characteristics of uniform-chemicalcomposition, low percentage of harmful elements, high purity, good surface quality, excellent drawing and cold heading performance. It is used extensivly in fields of screw and fasteners.SWRCH18A and SWRCH22A gain the gold-cup of the metallurgical product actual quality in 2007.SWRCH22A has been sold the east,the south,the north,the northeast and the southwest of China. In particular, many enterprises whose capital is from Taiwan and Hongkong and locate in the east and the south of China have a good reflection. The both steels are used to product the top-grade export productions.