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BS 4449 : 97

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BS 4449 : 97 Specification
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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