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HOT ROLLED
1. Coil inside diameter
......Mill
edge
................760
mm
......Pickled
& oiled
........610
mm
......Slit
strip
................
508 mm
2. Full slab coil mass
......1200
mm 23 Tons
......1225
mm 23 Tons
......1500
mm 25 Tons
3. Thickness (measured 20 mm from the edge)
| |
Tolerance
over or under thickness (mm) |
|
|
|
| |
1.6 to 1.9 |
2.0 to 2.4 |
2.5 to 4.4 |
4.5 to 5.9 |
6.0 to 7.9 |
8.0 to 9.9 |
|
1200mm |
0.18 |
0.18 |
0.20 |
0.23 |
0.30 |
0.32 |
|
1225mm |
0.18 |
0.18 |
0.20 |
0.23 |
0.30 |
0.32 |
|
1500mm |
0.18 |
0.20 |
0.20 |
0.23 |
0.36 |
0.38 |
4. Width
|
Mill edge |
-0.0mm to
+20.0mm |
|
Slit strip |
+-0.25mm |
5. Flatness (cut lengths)
| |
Deviation
from a flat surface in 1000mm length (mm) |
| |
1.6 to 4.0 |
4.5 to 5.0 |
6.0 to 9.0 |
| |
Std. |
Special |
Std. |
Special |
Std. |
Special |
|
925mm |
15 |
10 |
15 |
10 |
20 |
15 |
|
1225mm |
15 |
10 |
15 |
10 |
20 |
15 |
|
1500mm |
20 |
15 |
20 |
15 |
25 |
20 |
|
1800mm |
25 |
20 |
30 |
20 |
35 |
30 |
| |
To customer
specification |
6. Camber (cut lengths)
| |
Deviation of
the side edge of the sheet from a straight line (mm) |
|
Cut Length |
1000 |
1500 |
2000 |
2500 |
3000 |
4000 |
|
Permissible
Camber |
4 |
6 |
8 |
10 |
10 |
13 |
|
Special |
to customer
specification |
7. Length (cut lengths)
| |
Permissible
deviation from ordered length (over mm) |
|
Sheet length |
1000 |
1500 |
2000 |
2500 |
3000 |
4000 |
|
Std. deviation |
2.0 |
2.5 |
3.0 |
4.0 |
5.0 |
|
|
Special |
to customer
specification |
8. Diagonals (cut lengths out of square)
| |
Permissible
out of square deviation (mm) |
|
Sheet width |
1200 |
1225 |
1500 |
|
Std. Deviation |
4 |
5 |
6 |
|
Special |
to customer
specification |
What are the differences between hot rolled steel and cold rolled steel? In theory, the only difference is that hot rolled steel is rolled into its absolute dimensions as it is still hot enough to scale (this is at a temperature of over 920 degrees Celsius). Cold rolled products can be rolled into its lasting dimensions while it is still under the scaling temperatures. This makes cold rolled material easier to work with, as you would not have to estimate what the final size will be once the rolling process is complete. The cold rolled sheets can be finished in accordance to a tolerance level that matches the sizing rollers. As a steel merchant, getting exactly what you need is highly important - this is distilling it to the simplest of explanations. However, there are some options to consider before you go down either the cold rolled or hot rolled route, and these will be outlined in the descriptions below.
In regards to tolerance levels, the finished tolerance is far looser on hot rolled steel then on cold rolled. This is in regards to the square shape of the product, and will help in avoiding a trapezoidal shape. Cold rolled material requires clean ingots; this will ensure fewer carbon and slag inclusions but will raise your price substantially. In general, you will have to pay double the price for cold rolled steel as you will for hot rolled; therefore the biggest disadvantage is obvious. With hot rolled material, there is an acid pickling process that will remove all mill scale; finally it is oiled down to keep it from rusting. The cost incurred is a happy medium between standard hot rolled and cold rolled. Ensure that your aluminium and steel needs are kept in check, trust Steelrode for your hot rolled option.
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