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Products
Deformed Bars
Hot Rolled Deformed Bar is the core production between our melting and finishing operation. Our deformed bars geometry such as knots and ribs, their height, width, shape and spacing are well controlled during grooving and rolling to give maximum bond strength without affecting bendability and fatigue strength.
 |
| Qatar Steel Std. |
C
max |
Si
max |
Mn
max |
P
max |
S
max |
Yield strength (kg/mm2)
minimum |
Tensile Strength (kg/mm2)
minimum |
Elongation (%)
(min) |
Test Piece
(GL) |
Bending Angle
(degree) |
Bending Dia. |
| QD30 |
-- |
-- |
-- |
0.050 |
0.050 |
30 |
49 |
14
18 |
No.1
No.2 |
180 |
Rated Dia. x 3.5 |
| QD43 |
-- |
-- |
1.80 |
0.050 |
0.050 |
43 |
64 |
12 |
200 mm |
180 |
<= D16 Rated Dia x 3.5
>D16 Rated Dia. x 4 |
| QD47 |
0.25 |
-- |
-- |
0.050 |
0.050 |
47 |
1.08 x Actual
YS |
14 |
5D |
180 |
Rated Dia. x 3 |
| No. 1 Test Piece: |
The gauge length shall be 8 times the diameter of steel bars up to 25mm in nominal diameter |
| No. 2 Test Piece: |
The gauge length shall be 4 times the diameter of steel bars above 25mm in nominal diameter |
| Rebend Test for QD 47 is required. |
| Length |
Tolerance |
|
Size |
Tolerance |
| |
|
|
Single Piece |
One Set |
| up to 7m |
+40mm - 0mm |
D20 & under |
-6 % |
-5 % |
| over 7m |
+50mm - 0mm |
D22 to D30 |
-5 % |
-4 % |
| |
|
D32 to D40 |
-4 % |
-3.5 % |
Nominal Dimensions, Weight & Tolerance On Knots
| D8 |
8 |
50.27 |
0.395 |
5.6 |
0.3 |
0.6 |
3.14 |
2.37 |
3.56 |
4.74 |
| D10 |
10 |
78.54 |
0.617 |
7.0 |
0.4 |
0.8 |
3.9 |
3.70 |
5.55 |
7.40 |
| D12 |
12 |
113.1 |
0.888 |
8.4 |
0.5 |
1.0 |
4.7 |
5.33 |
7.99 |
10.66 |
| D14 |
14 |
153.9 |
1.21 |
9.8 |
0.6 |
1.2 |
5.5 |
7.26 |
10.89 |
14.52 |
| D16 |
16 |
201.1 |
1.58 |
11.2 |
0.7 |
1.4 |
6.3 |
9.48 |
14.22 |
18.96 |
| D18 |
18 |
254.5 |
2.00 |
12.6 |
0.8 |
1.6 |
7.1 |
12.00 |
18.00 |
24.00 |
| D20 |
20 |
314.2 |
2.47 |
14.0 |
1.0 |
2.0 |
7.9 |
14.82 |
22.23 |
29.64 |
| D22 |
22 |
380.1 |
2.98 |
15.4 |
1.1 |
2.2 |
8.6 |
17.88 |
26.82 |
35.76 |
| D25 |
25 |
490.9 |
3.85 |
17.5 |
1.3 |
2.6 |
9.8 |
23.10 |
34.65 |
46.20 |
| D28 |
28 |
615.8 |
4.83 |
19.6 |
1.4 |
2.8 |
11.0 |
28.98 |
43.47 |
57.96 |
| D30 |
30 |
706.9 |
5.55 |
21.0 |
1.5 |
3.0 |
11.8 |
33.30 |
49.95 |
66.60 |
| D32 |
32 |
804.2 |
6.31 |
22.4 |
1.6 |
3.2 |
12.6 |
37.86 |
56.79 |
75.72 |
| D36 |
36 |
1017.4 |
7.986 |
25.2 |
1.8 |
3.6 |
14.1 |
47.92 |
71.87 |
95.83 |
| D40 |
40 |
1256.6 |
9.864 |
28.0 |
2.0 |
4.0 |
15.7 |
59.18 |
88.78 |
118.37 |
Markings
Deformed bars produced at Qatar Steel conform to various national and international standards such as, QD 30/QD 43/QD 47 (Qatar), BS4449: 1997 Grade 460 (British), SSA 2/1992 (Saudi High Tensile), ASTM A615 Grade 40/Grade 60 (American) and JIS G3112 SD 295A (Japanese).
The registered trade mark 'QATAR STEEL' is rolled on every deformed rebars at an interval of about one meter, long with all identification marks.
| Average Spacing of Knots |
= 1/10 (p1+p2+. . .+p10) |
| Height of Knots |
= 1/3 (h1+h2+h3) |
| Width of longitudinal ribs |
= g1+g2 |
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