Our company invested a large a mount of money in the independent development of right angle(sharp angle)rectangular tube,which has obtained a number of domestic and international invention and utility model patent technology.Our large diameter thick wall square and rectangular tube and right angle(sharp angle) square and rectangular tube has filled many gaps at home and abroad.Our products are widely used in skyscrapers,glass curtain walls,machinery manufacturing,automobile industry,airport terminals,highway and railway,electrified railway,aviation and many other industries and fields.