The materials and products used in building design and construction are almost universally designated by reference to an appropriate ASTM specification. This simplifies the design and construction process because you can define all the characteristics of a specified product. However, with dozens of ASTM specifications applicable in steel building construction alone, it can be a challenge to keep the standard designations used in contract documents correct. ASTM's steel standards are instrumental in classifying, evaluating, and specifying the material, chemical, mechanical, and metallurgical properties of the different types of steels, which are primarily used in the production of mechanical components, industrial parts, and construction elements, as well as other accessories related to them. The steels can be of the carbon, structural, stainless, ferritic, austenitic, and alloy types. These steel standards are helpful in guiding metallurgical laboratories and refineries, product manufacturers, and other end-users of steel and its variants in their proper processing and application procedures to ensure quality towards safe use. ASTM and other standards which are strictly followed at BSI are provided below:
Codes of Standards Followed By BSI:
► BDS/ISO 6935-2:2006.
► ASTM A 615/A 615M – 03A.
► BS 4449: 97 GR 250 / 460 A / 460 B.
► DIN 488 : 1986 BSt 420 S / BSt 500 S
(BDS/ISO 6935-2:2006)
Grade
Yield Strength
Ultimate Tensile Strength
Elongation
Mpa
%
300
330
16
400/400W
400
440
14
500/500W
500
550
Nominal Dia of the bar
8
10
12
20
25
32
Mandrel dia for bend test
40
63
80
125
160
Mandrel dia for re-bend test
50
100
200
320
Nominal bar Dia (mm)
Nominal cross-sectional area (mm2)
Mass per length
Requirement (kg/m)
Permissible deviation (%)
50.3
0.395
±8
78.3
0.617
±5
113
0.888
201
1.58
314
2.47
491
3.85
±4
804
6.31
BS 4449 : 97 GR 250 / 460 A / 460 B
Rated Dia
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
mm.
mm2
min.
max.
6
28.3
0.222
± 9
0.3
0.6
0.48
0.72
0.84
1.2
3,.0
4.8
1.5
2.3
± 6.5
0.4
0.8
0.64
0.96
1.6
4.0
6.4
2.0
3.1
78.5
0.616
0.5
1.0
5.0
8.0
2.5
3.9
113.1
± 4.5
1.44
2.4
6.0
9.6
3.0
4.7
201.1
1.579
1.28
1.92
3.2
12.8
6.2
314.2
2.466
10.0
16.0
7.8
490.9
3.854
1.25
12.5
20.0
9.8
804.2
6.313
1.60
2.56
3.84
25.6
1256.6
9.864
32.0
15.7
1963.5
15,413
25.0
40.0
19.6
MECHANICAL PROPERTIES TEST
Quality
Akma N / mm2
Akma / Pull Rate N/mm2
Elongation Elasticity
Total max. % AGT
GR 250
250
Akma x 1.15
22
-
GR 460 A
460
Akma x 1.05
GR 460 B
Akma x 1.08
5
DIN 488 : 1986 BSt 420 S / BSt 500 S
Rated Diameter
EN to the Ribs (mm)
BST 420 S
BST 500 S
Kg / m.
Tolerans %
Pitch (mm.)
HATVE ( mm. )
1.Face
2.Face
± 4
0.39
4.93
6.67
3.57
4.83
4.25
5.75
0.52
5.61
7.59
4.08
5.52
4.76
6.44
0.65
6.37
8.62
4.67
6.32
7.47
0.78
7.05
9.54
5.18
7.01
6.12
8.28
1.21
154
0.91
1.4
1.12
1.68
0.7
8.24
11.15
6.03
8.16
7.14
9.66
1.04
9.35
12.65
6.97
9.43
11.04
1.3
11.73
15.87
8.67
10.2
13.8
1.63
14.70
19.89
10.79
14.60
12.75
17.25
28
616
1.82
2.8
2.24
3.36
1.40
16.40
22.19
12.15
16.44
14.28
19.32
Akma N / mm 2 min
Drawing N / mm2
Elongation % (10d) min
BSt 420 S
420
500 ( min. Akma x 1.05 )
BSt 500 S
550 ( min. Akma x 1.05 )
Copyright: © Bandar Steel Industries Ltd.
