欧标角钢规格 20*20*3 25*25*3 25*25*3*4 30*30*3 30*30*4 35*35*4 35*35*5 40*40*4 40*40*5 40*40*6 45*45*3 45*45*5 45*45*4.5 45*45*6 45*45*5 45*45*7 50*50*4 50*50*5 50*50*6 50*50*7 50*50*8 50*50*9 55*55*4 55*55*5 55*55*6 60*60*4 60*60*5 60*60*7 60*60*8 60*60*10 63*63*5 63*63*6 63*63*6.5 65*65*6.4 65*65*5 65* 65*6 65*65*7 65*65*8 65*65*8 65*65*9 65*65*10 65*65*11~~300*300*35 欧标角钢材质S235 S275 S355