国产 在线 一区二区三区_亚洲国产精品欧美日韩一区二区_在线观看不卡av电影_国产日韩久久免费福利网站

Casus Products>> Casus

XINGTAI STEEL research and development weathering resistant steel XG295NH with down stream customer. This customer produce T-type bolt used in underground pipeline system of complex and harsh environment .This XG295NH bolt have the advantage of corrosion resistant,long service life and energy saving.