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British Standards
Accomplying: BS 4449 : 97
  British Standard Deformed Steel Bars, BS 4449-97, Deformed Steel Bars Specification, Steel Size, Theoretical Bundle Weight, BS 4449-97 Grade Specification, British Standards Institution BS 4449 : 97 - Specification - GR 250 / GR 460 A / GR 460 B
     
 

BS 4449 : 97 - Deformed Steel Bars

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BS 4449 : 97 GR 250 / 460 A / 460 B
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 TEST
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 COMPOSITION
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          
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