城市建设及亮化工程离不开不锈钢材料，尤其是不锈钢管材，其美观、光亮的豪华外表以及永不生锈的特点，深受人们的喜爱。但是，传统的纯不锈钢管强度低、价格高，有的城市为此付出了极大的代价，如新建的不锈钢街道护栏不久前面目全非，新建的旗杆经不起风雨，新设计的过街人 Urban construction and lighting projects can not do without stainless steel, especially stainless steel pipe, its beautiful, bright luxury appearance and never rust characteristics, by the people’s favorite. However, the traditional pure stainless steel pipe is low in strength and high in price. Some cities pay a great price for this. For example, the newly built stainless steel street guardrail has long been beyond recognition. The new flagpole can not stand the storm. The newly designed crossing man