sepecification
matreial	product NO.	size(mm)	theoretical weight
			(kg/m)
Q235B	5#	50*37*4.5	5.440
	6.3#	63**40*4.8	6.635
	6.5#	65*40*4.8	6.700
	8#	80*43*5	8.045
	10#	100*48*5.3	10.007
	12#	120*53*5.5	12.060
	12.6#	126*53*5.5	12.370
	14#A	140*60*8	14.530
	14#B	140*60*8	16.730
	16#A	160*63*6.5	17.230
	16#B	160*65*8.5	19.755
	18#A	180*68*7	20.170
	18#B	180*70*9	23.000
	20#A	200*73*7	22.637
	20#B	200*75*9	25.777
	22#A	220*77*7	24.999
	22#B	220*79*9	28.453
	24#A	240*78*7	26.860
	24#B	240*80*9	30.628
	25#A	250*78*7	27.410
	25#B	250*80*9	31.335
	27#A	270*82*7.5	30.838
	27#B	270*84*9.5	35.077
	28#A	280*82*7.5	31.427
	28#B	280*84*9.5	35.823
	30#A	300*85*7.5	34.463
	30#B	300*87*9.5	39.173
	32#A	320*88*8	38.083
	32#B	320*90*10	43.107
	36#A	360*96*9	47.814
	36#B	360*98*11	53.466
	40#A	400*100*10.5	58.928
	40#B	400*102*12.5	65.208