Chemical
Composition of Steel Grades:
Cast Analysis
Element
Grade 250
% (max.)
Grade 460
% (max.)
Carbon
0.25
0.25
Sulfur
0.06
0.05
Phosphorus
0.06
0.05
Nitrogen
0.012
0.012
Note:
1.
The
maximum value for nitrogen
does not apply if the chemical
composition shows a minimum
aluminium content of 0.020%
or if sufficient other nitrogen
binding elements are present.
Note:
2.
Nitrogen
content is not normally
given on a release certificate.
Maximum
carbon equivalent values: cast
analysis
Element
Maximum
carbon equivalent value
%
250
0.42
460
0.51
B. Cross Sectional Area and Mass:
Cross
Sectional Area and Mass
Nominal
Size
mm
Cross -
Sectional Area
mm2
Mass per
Metre Run
Kg.
6 *a
28.3
0.222
8
50.3
0.395
10
78.5
0.616
12
113.1
0.888
16
201.1
1.579
20
314.2
2.466
25
490.9
3.854
32
804.2
6.313
40
1256.6
9.864
50
1963.5
15.413
Note
*a : This
is a non preferred size
Tolerance
on Mass
Nominal
Size
mm
Maximum
carbon equivalent value
%
6
+/- 9
8 and 10
+/- 6.5
12 and over
+/- 4.5
Tensile
Properties
Grade
Yield Strangth
Re(a)
N/mm2
Stress
ratio Rm/Re(b)
min
Elongation
at Fracture A5 (min)
%
Total elongation
at maximum force Agf(c) (min)
%
250
250
1.15
22
-
460 A(d)
460
1.05
12
2.5
460 B(d)
460
1.08
14
5
Note:
a)
For routine testing the
yield strength shall be
considered a minimum value.
For determination of the
long turm quality level,
the values given shall be
for the characteriestic
strength.
b) Rm is the tensile strength.
c) The total elongation
at maximum force shall be
measured and recorded and
available for inspection
but values obtained below
the minimum values specified
shall not be a cause for
non-conformity with this
British standard.
d) Ductility classes A and
B are designated ductility
classes N and H respectively
in DD ENV 1992-1-1:1992.
C. Mechanical Properties:
Rebend
Test Formers
Grade
Nominal
Size mm
Diameter
of former
250
All Sizes
2d
460
d < 16
5d
d > 16
7d
d=
Nominal dia of the bar.
ASTM
- A 615 - 87 Deformed and Plain Billet
Steel Bars for Concrete Reinforcement.
An analysis
of each heat of steel shall be made
by the manufacturer from test samples
taken preferably during the pouring
of the heat. The percentages of carbon,
manganese, phosphorus, and sulfur, shall
be determined. The phosphorus content
thus determined shall not exceed 0.06%.
2
The chemical
composition thus determined shall be
reported on request to the purchaser
or his representative.
3
An analysis
may be made by the purchaser from finished
bars. The phosphorus content thus determined
shall not exceed that specified in 1
by more than 25%.
B. Cross Sectional Area and Masses :
Deformed
bar Designation Number, Nominal
Weights, Nominal Dimensions
and Deformation Requirements.
Bar
designation
No. (b)
Nominal
Weights
lb/ft
Nominal
Dimensions(a)
Deformation
Requirements. in.
Diameter
in.
Cross-Sectional
Area
in.2
Perimeter
in.
Maximum
Average
Spacing
Minimum
Average
Height
Maximum Gap.
(Chord of
12.5% of
Nominal Perimeter)
3
0.376
0.375
0.11
1.178
0.262
0.015
0.143
4
0.668
0.5
0.2
1.571
0.35
0.02
0.191
5
1.043
0.625
0.31
1.963
0.437
0.028
0.239
6
1.502
0.75
0.44
2.356
0.525
0.038
0.286
7
2.044
0.875
0.6
2.749
0.612
0.044
0.334
8
2.67
1
0.79
3.142
0.7
0.05
0.383
9
3.4
1.128
1
3.544
0.79
0.056
0.431
10
4.303
1.27
1.27
3.99
0.889
0.064
0.487
11
5.313
1.41
1.56
4.43
0.987
0.071
0.54
14
7.65
1.693
2.25
5.32
1.185
0.085
0.648
18
13.6
2.257
4
7.09
1.58
0.102
0.864
Note:
a.
The nominal dimensions of
a deformed bar are equivalent
to those of a plain round
bar having the same weight
per foot as the deformed
bar.
b. Bar numbers are based
on the number of eighths
of an inch included in the
nominal diameter of the
bars.
Permissible Variation in Weight:
The permissible variation shall
not exceed 6% under nominal weight,
exccpt for bars smaller than 3/8
in. plain round, the permissible
variation in weight shall be computed
upon the basis on the permissible
variation in diameter in specification
A 510. Reinforcing bars are evaluated
on the basis of nominal weights.
In no case shall the overweight
of any bar be the cause for rejection.
C. Mechanical Properties :
Tensile
Requirements.
Grade 40
(A)
Grade 60
Grade 75
(B)
Tensile strength,
min, psi
70000
90000
100000
Yield strength,
min, psi
40000
60000
75000
Elongation
in 8 in., min%
Bar No.
3
11
9
-
4,5,6
12
9
-
7,8
-
8
-
9,10
-
7
-
11,14,18
-
7
6
Note:
A.
Grade 40 bars are furnished
only in sizes 3 through
6.
B. Grade 75 bars are furnished
only in sizes 11, 14 &
18,
Bend
Test Requirements.
Bar Designation
No.
Pin Diameter
for Bend Tests (A)
Grade 40
Grade 60
Grade 75
3,4,5
3.5d (B)
3.5d
-
6
5d
5d
-
7,8
-
5d
-
9,10
-
7d
-
11
-
7d
7d
14,18 (90o)
-
9d
9d
Note:
A.
Test bends 180o unless noted
otherwise.
B. d= Nominal diameter of
specimen.
BDS
1313:1991 Steel bars and wires for the
reinforcement of concrete.
