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自改革开放以来，随建筑业的迅速发展和对外交往增多，我国大量使用Ⅰ级钢（２３５ＭＰａ），Ⅱ级钢（３３５ＭＰａ）的状况已不适应建筑要求，更无法与国际接轨。当前欧美先进国家主要建筑用钢是采用微合金化技术生产的强度高，综合性能好的４００ＭＰａ、５００ＭＰａ的钢筋
Since the reform and opening up, with the rapid development of the construction industry and the increase in foreign exchanges, China has made extensive use of Grade I steel (235 MPa), and the status of Grade II steel (335 MPa) has not been adapted to construction requirements, and it has been unable to meet international standards. The main building steels in the advanced countries in Europe and America are high-strength steels with 400MPa and 500MPa that are produced with the use of micro-alloying technology.