据预测,住宅建筑中,如果城镇以人均居住面积约8M~2计算,则全国城镇平均每年需建住宅建筑约1.33亿 M~2,估计全国乡村平均每年需建6亿 M~2。按耗钢指标测算,平均每年需要钢材约410万吨。工业厂房建造面积按城镇住宅面积的30%计,则平均每年需建厂房约0.4亿 M~2;城乡公共建筑平均 It is predicted that in residential buildings, if the urban area is calculated at a per capita living area of ​​about 8M ~ 2, an average of 133 million M ~ 2 residential buildings will need to be built each year in urban areas nationwide, and it is estimated that an average of 600 million M ~ 2 will be built each year in rural areas nationwide. Measured by the consumption of steel indicators, the average annual need of about 4.1 million tons of steel. Industrial plant construction area according to urban residential area of ​​30%, then the average annual construction plant about 40 million M ~ 2; urban and rural public buildings average