Name: Hot Rolled Steel Rebars Specifications
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Hot Rolled Steel Rebars Specifications

Hot Rolled Steel Rebars-2

1.Nominal diameter, nominal cross-sectional area and theoretical weight of steel bars
Nominal diameter (mm)	Nominal cross-sectional area of different number of steel bars (mm²)									Theoretical weight of a single steel bar (kg/m)
Nominal diameter (mm)	1	2	3	4	5	6	7	8	9	Theoretical weight of a single steel bar (kg/m)
6	28.3	57	85	113	142	170	198	226	255	0.222
8	50.3	101	151	201	252	302	352	402	453	0.395
10	78.5	157	236	314	393	471	550	628	707	0.617
12	113.1	226	339	452	565	678	791	904	1017	0.888
14	153.9	308	461	615	769	923	1077	1231	1385	1.21
16	201.1	402	603	804	1005	1206	1407	1608	1809	1.58
18	254.5	509	763	1017	1272	1527	1781	2036	2290	2.00(2.11)
20	314.2	628	942	1256	1570	1884	2199	2513	2827	2.47
22	380.1	760	1140	1520	1900	2281	2661	3041	3421	2.98
25	490.9	982	1473	1964	2454	2945	3436	3927	4418	3.85(4.10)
28	615.8	1232	1847	2463	3079	3695	4310	4926	5542	4.83
32	804.2	1609	2413	3217	4021	4826	5630	6434	7238	6.31(6.65)
36	1017.9	2036	3054	4072	5089	6107	7125	8143	9161	7.99
40	1256.6	2513	3770	5027	6283	7540	8796	10053	11310	9.87(10.34)
50	1963.5	3928	5892	7856	9820	11784	13748	15712	17676	15.42(16.28)
Note: The valuesin brackets are the valuesof prestressed threaded steel bars.

2. Dimensions and specifications of ribbed steel bars

d-inner diameter of steel bar
a-angle of transverse rib
h-height of transverse rib
B-angle between transverse rib and axis
h1-height of longitudinal rib
0-angle of longitudinal rib
a-width of longitudinal rib top
1-distance between transverse ribs
b-width of transverse rib top

Dimensions of ribbed steel bars (mm)
Nominal Diameter	Inner diameter d		Transverse rib height h		Longitudinal rib height h1		Transverse rib width b	Longitudinal rib width a	Spacing f		Maximum gap at the end of the transverse rib(10% chord length of the nominal circumference)
Nominal Diameter	Nominal size	Permissible deviation	Nominal size	Permissible deviation	Nominal size	Permissible deviation	Transverse rib width b	Longitudinal rib width a	Nominal size	Permissible deviation
6	5.8	0.3	0.6	+0.3 -0.2	0.6	±0.3	0.4	1	4	±0.5	1.8
8	7.7	±0.4	0.8	+0.4 -0.2 +0.4	0.8	±0.5	0.5	1.5	5.5		2.5
10	9.6		1	-0.3	1	±0.5	0.6	1.5	7		3.1
12	11.5		1.2	±0.4	1.2	±0.8	0.7	1.5	8		3.7
14	13.4		1.4		1.4		0.8	1.8	9		4.3
16	15.4		1.5		1.5		0.9	1.8	10		5.0
18	17.3		1.6	+0.5 -0.4	1.6		1.0	2	10		5.6
20	19.3	±0.5	1.7	±0.5	1.7		1.2	2	10	±0.8	6.2
22	21.3		1.9	±0.6	1.9	±0.9	1.3	2.5	10.5		6.8
25	24.2		2.1		2.1		1.5	2.5	12.5		7.7
28	27.2	±0.6	2.2		2.2		1.7	3	12.5	±1.0	8.6
32	31.0		2.4	+0.8 -0.7	2.4	±1.1	1.9	3	14		9.9
36	35.0		2.6	+1 -0.8	2.6		2.1	3.5	15		11.1
40	38.7	±0.7	2.9	±1.1	2.9		2.2	3.5	15		12.4
50	48.5	±0.8	3.2	±1.2	3.2	±1.2	2.5	4	16		15.5

Permissible deviation of quality of ribbed steel bars
Nominal diameter/mm	Deviation between actual mass and theoretical mass (%)
6—12	±7
14—20	±5
22—50	±4

3. Brand and chemical composition
Brand	Chemical composition (mass fraction) (%)≤
Brand	C	Si	Mn	P	S	Ceq
HRB 335	0.25	0.8	1.6	0.045	0.045	0.52
HRB 400	0.25	0.8	1.6	0.045	0.045	0.54
HRB 500	0.25	0.8	1.6	0.045	0.045	0.55
Note: 1. The grade of hot-rolled ribbed steel bars is composed of HRB and the minimum yield point of the grade. H, R, and B are the first letters of the three words hot-rolled (H0tr011ed), ribbed (Ribbed), and bars (Bars) respectively. Hot-rolled ribbed steel bars are divided into three grades: HRB 335, HRB 400, and HRB 500. 2. The carbon equivalent Ceq (%) value can be calculated as follows:Ceq=Wc+WMn /6+(WCr+WV+WMO)/5+(WCu+WNi)/15Wc and WMn are the mass fractions of C and Mn respectively.

4. Mechanical properties
Brand	Nominal diameter/mm	σs(or σp0.2)/ MPa	σb / MPa	δ5(%)
Brand	Nominal diameter/mm	≥
HRB 335	6—25 28—50	335	490	16
HRB 400	6—25 28—50	400	570	14
HRB 500	6—25 28—50	500	630	12