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Rebar B500A / B / C, what is the difference?

Rebar B500A / B / C, what is the difference?

Posted by Arie van Wijngaarden on 31-05-2016

The mutual difference between the reinforcing steel types B500A, B500B and B500C.

Reinforcing steel type	B500A	B500B	B500C
Surface	smooth, dented, ribbed	dented, ribbed	ribbed
Form of delivery	coils, bars, spot-welded reinforcing mesh, lattice girders		coils, bars, spot-welded reinforcing mesh
Nominal centerline [mm]	4 - 16	6 - 50	6 - 50
Min. yield point R_e [MPa]	500	500	500 R_e,act/R_e,nom<1,25
Min. R_m/R_e ratio	1,05^a	1,08	1,15^c;<1,35
Min. elongation at max load A_gt [%]	3,0^{a, b}	5,0^b	7,5^b,c
Min. fatigue strength 2σ_a^d [MPa]	100	d ≤ 28 mm: 175 d> 28 mm: 145	d ≤ 28 mm: 175 d> 28 mm: 145
Min. shear force - spot-welded mesh F_s - lattice girder^e F_w/d [kN]	0.25 x A_n x R_e 0.25 x A_0/b x R_e,0/b or 0.6 x A_d x R_e,d	0.25 x A_n x R^e 0.25 x A_0/b x R_e,0/b or 0.6 x A_d x R_e,d	0.25 x A_n x R_ena
Tolerance nominal centerline [%]	+/- 4.5	+/- 4.5	+/- 4.5
Chem. composition [mass%]	C < 0.22, etc C_eq < 0.50	C < 0.22, etc C_eq < 0.50	C < 0.22, etc C_eq < 0.50
Min. relative area cross rib, f_R/P^f	d = 4.0 - 6.0: 0.039 d = 9.0 - 10.5: 0.052 d = 6.5 - 8.5: 0.045 d = 11.0 - 50: 0.056
a) R_m / R_e1.03 and A_gt 2.0 for center lines ≤ 5.5 mm
b) A_gt for coils + 0.5%
c) R_m / R_e min. 1.13 and A_gt 7.0% for center lines ≤ 12 mm
d) Maximum tension ripple 2σ_a with a maximum tension 0.6 R_e,k (300 MPa) and 1 million alternations. For spot-welded reinforcing mesh B500B and B500C, 2σ_a is at least 100 MPa. For coil-oriented products, 2σ_a is at least 100 MPa, unless a higher value (≤ 175 MPa) is statistically demonstrated for the maximum diameter used and for the targeting machine (type) concerned.
e) For lattice girders, the lower bars must comply with B500A and/or B500B with the f_R/P requirement. The upper bars and diagonals may be reinforcing steel with only the requirements of R_e,d and the chemical composition.
f) For coils f_R (ribbed) + 15%, f_P (dented) + 5%. No requirement for weakly profiled/dented reinforcing steel (lattice girders).

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This information has been compiled with the utmost care. If nevertheless inaccuracies or imperfections occur, Betonstaal.nl accepts no liability for the possible consequences thereof. [source: NEN 6008: 2008]

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