B500B rebar is cooled and then drawn, so its surface is smoother, with better weldability and bending, suitable for bending and welding of structural parts. B500A steel bar is directly drawn after hot rolling, the surface is relatively rough, but its mechanical properties are better, suitable for structural parts with high strength requirements
Rebar is the name of hot rolled ribbed bar. The grade of ordinary hot-rolled steel bar is composed of HRB and the yield point of the grade. H, R and B are hot-rolled, ribbed and rebar three times respectively
It is widely use in many fields like the following：
Rail transit, architectural decoration, nuclear power, chemical equipment, structural pipe making
Technical requirements of B500B rebar
1 .Melting component a If the carbon equivalent is reduced by 0.02%, the maximum allowable carbon content is increased by 0.03%. C carbon equivalent Ceq is calculated according to the following formula :C =C+, Or+Mo+V Ni+Ca15
2. The maximum yield strength of mechanical properties a is 650mpa, and the maximum yield strength Ruro can be used to measure the yield strength R. If the yield phenomenon is not obvious, the stress R at 0.2% non-proportional elongation can be specified to determine the yield strength R.
3. Special requirements According to customer requirements, boron content is greater than 8ppm.
Chemical composition of British standard B500B rebar (melting analysis) table
|
Mark |
Size |
Chemical composition (%) |
Ceq |
|||||
|
C |
Si |
Mn |
S,P |
V |
B |
|||
|
B500B |
8-20 |
0.18-0.22 |
0.35-0.60 |
1.30-1.60 |
≤0.05 |
0.060-0.12 |
0.0008-0.4 |
≤0.52 |
|
22-25 |
0.18-0.22 |
0.45-0.70 |
1.40-1.60 |
≤0.05 |
0.070-0.12 |
0.0008-0.4 |
||
|
28-40 |
0.18-0.22 |
0.45-0.70 |
1.45-1.60 |
≤0.05 |
0.085-0.12 |
0.0008-0.4 |
||
Chemical composition of B500B rebar
|
Size |
Mark |
Carbon%
|
Silicon%
|
Manganese%
|
Phosphorus%
|
Sulphur%
|
Vanadium% |
Boron% |
|
8 |
B500B |
0.21 |
0.45 |
1.38 |
0.034 |
0.017 |
0.071 |
0.0035 |
|
10 |
0.20 |
0.18 |
1.44 |
0.034 |
0.017 |
0.071 |
0.0035 |
|
|
12 |
0.22 |
0.48 |
1.38 |
0.029 |
0.020 |
0.095 |
0.0035 |
|
|
14 |
0.20 |
0.48 |
1.4 |
0.034 |
0.013 |
0.082 |
0.0035 |
|
|
20 |
0.20 |
0.50 |
1.38 |
0.037 |
0.014 |
0.076 |
0.0035 |
|
|
25 |
0.20 |
0.52 |
1.58 |
0.013 |
0.008 |
0.866 |
0.0035 |
Mechanical properties of B500B rebar
|
Size |
Mark |
yield strength |
strength of extension
|
percentage elongation after fracture |
Maximum total elongation |
||||
|
8 |
B500B |
561 |
557 |
712 |
704 |
26.5 |
27.0 |
10.5 |
11.0 |
|
10 |
535 |
547 |
688 |
694 |
25.0 |
26.0 |
10.5 |
11.0 |
|
|
12 |
533 |
522 |
675 |
667 |
27.0 |
27.0 |
10.0 |
14.5 |
|
|
14 |
572 |
565 |
715 |
702 |
24.5 |
24.0 |
11.5 |
12.5 |
|
|
20 |
544 |
541 |
691 |
684 |
23.5 |
24.0 |
14 |
13.5 |
|
|
25 |
517 |
540 |
660 |
639 |
22.5 |
20.5 |
14.5 |
12.0 |
|
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