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British Standard Steel Rebar

BS 4449:97 Rebar Specifications

British Standard Steel Rebar BS 4449:97 Specifications

BS 4449 : 97 Steel Rebar Specifications
Rated
Diameter
Nominal Cross Section Area Weight EN to the ribs (mm) Longitudinal Ribs (mm) Pitch / STEP
mm
Ribs TIP Distance
mm.
Kg / m Tolerance
%
Height Width Height Width
mm. mm2 min. max. min. max. min. max. min. max. min. max. min. max.
6 28.3 0.222 ± 9 0.3 0.6 0.48 0.72 0.3 0.84 0.48 1.2 3,.0 4.8 1.5 2.3
8 50.3 0.395 ± 6.5 0.4 0.8 0.64 0.96 0.4 0.84 0.64 1.6 4.0 6.4 2.0 3.1
10 78.5 0.616 0.5 1.0 0.8 1.2 0.5 0.84 0.8 2.0 5.0 8.0 2.5 3.9
12 113.1 0.888 ± 4.5 0.6 1.2 0.96 1.44 0.6 0.84 0.96 2.4 6.0 9.6 3.0 4.7
16 201.1 1.579 0.8 1.6 1.28 1.92 0.8 0.84 1.28 3.2 8.0 12.8 4.0 6.2
20 314.2 2.466 1.0 2.0 1.6 2.4 1.0 0.84 1.6 4.0 10.0 16.0 5.0 7.8
25 490.9 3.854 1.25 2.5 2.0 3.0 1.25 0.84 2.0 5.0 12.5 20.0 6.2 9.8
32 804.2 6.313 1.60 3.2 2.56 3.84 1.60 0.84 2.56 6.4 16.0 25.6 8.0 12.5
40 1256.6 9.864 2.0 4.0 3.2 4.8 2.0 0.84 3.2 8.0 20.0 32.0 10.0 15.7
50 1963.5 15,413 2.5 5.0 4.0 6.0 2.5 0.84 4.0 10.0 25.0 40.0 12.5 19.6
Mechanical Properties
Quality Akma N / mm2< Akma / Pull Rate N/mm2 Elongation Elasticity Total max. % AGT
  min. min. min. min.
GR 250 250 Akma x 1.15 22
GR 460 A 460 Akma x 1.05 12 2.5
GR 460 B 460 Akma x 1.08 14 5
Chemical Properties
Element GR 250 % max. GR 460 A / B % max. Ribs and Marking Method
Casting Product Casting Product
GR 250
GR 460 A ( 8.18 )
GR 460 B ( 8.18 )
C 0.25 0.27 0.25 0.27
P 0.060 0.065 0.050 0.055
S 0.060 0.065 0.050 0.055
N 0.012 0.013 0.012 0.013
CE 0.42 0.45 0.51 0.54
         
                      Mn             Cr+Mo+V              Ni+Cu     
CE = C + ————- + ——————- + —————–
                      6                       5                        15