On the market today, construction materials are diverse in design, quality and price, in which construction steel prices fluctuate continuously over time. To distinguish the construction steel, the user needs to understand the most basic characteristics of the steel. Construction steel is composed of: steel coil, steel bar, checked steel, plain round bar…

Steel Coil: is wire rods with diameter: Ø6mm, Ø8mm, Ø10mm, surface is smooth, steel wire is rolled into a coil, each coil has weight from 750 to 2000 kg.

Flat round bars: have round bar shape, smooth surface, the length of 12 meters /bar. The steel bars have diameter of Ø14, Ø16, Ø18, Ø20, Ø22, Ø25 and are bundled in bunches with a weight of 2000 kgs/bundle.

Steel bars and ribbed bars: These steel are diversified in dimensions, including steel wires having diameter of Ø10, Ø12, Ø14, Ø16, Ø18, Ø20, Ø22, Ø25, Ø28, Ø32. They are reinforced concrete, produced with a ribbed surface, have diameter from 10 mm – 51 mm. The length of the material depends on the requirements of customer. Commonly, each bar is 11.7m long and bundled with the weight of about 1,500-3,000 kgs.11.7m long and is bundled with the weight of about 1,500-3,000 kg.

Nominal diameter (mm)			Nominal Cross-sectional	Unit Weight (kg/m)
			area (mm2)
Coil Steel	Ribbed Steel	Round steel bar
5,5			23,76	0,187
6			28,27	0,222
6,5			33,18	0,260
7			38,48	0,302
7,5			44,18	0,347
8			50,27	0,395
8,5			56,75	0,445
9			63,62	0,499
9,5			70,88	0,556
10	10	10	78,54	0,617
10,5			86,59	0,680
11			95,03	0,746
11,5			103,87	0,815
12	12	12	113,10	0,888
12,5			122,72	0,963
13	13		132,73	1,042
14	14	14	153,94	1,208
15			176,71	1,387
16	16	16	201,06	1,578
	18	18	254,47	1,998
	19		283,53	2,226
	20	20	314,16	2,466
	22	22	380,13	2,984
	25	25	490,87	3,853
	28	28	615,75	4,834
	29		660,52	5,185
	30	30	706,86	5,549
	32	32	804,25	6,313
	35		962,11	7,553
	40	40	1256,64	9,865