中文字幕精品一区二区精品,乱码av午夜噜噜噜噜一,日韩精品久久久久久久电影竹菊,欧美一区二区三区在线播放,日韩av中文字幕在线,久久r久久,亚洲男人天堂2024

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.