Flame Cutting
FLAME CUTTING UP TO 500MM
Oxy-fuel gas cutting, oxy-propane cutting and steel profiling
Flame cutting is a process known by many names, such as oxy-fuel gas cutting, oxy-propane cutting and steel profiling.
The process utilises a torch which an ignited mixture of oxygen and a fuel gas (such as propane) are passed through. An outer ring of jets in the torch nozzle are used to preheat the surface of the steel. A separate pure oxygen stream is directed from a central jet on to the area to be cut. Rapid oxidation of the steel takes place and material is removed by the pressure of the gases.
Flame Cutting Benefits
- Can cut through thicknesses beyond the capability of plasma
- Utilising multiple cutting heads provides a quick turnaround on flame cut profiles
- Flame cutting is economical and quick to set up, with minimal down time
Flame Cutting Tolerances
Thickness Tolerance
Thickness tolerance for profiling shall be in accordance to BS EN 10029:1991 Class A.
Flatness Tolerance
Profiling flatness tolerance shall be in accordance to BS EN 10029:1991.
Profiling Tolerances for Lengths and Widths
Rectangular
For rectangular profiled steel plates, where length L, is defined as the greater of the two dimensions, tolerances on length and width shall be as given in Table 1.
Non-rectangular
For non-rectangular profiled steel plates, tolerances will be as given in Table 1, where length L shall be assumed to be the maximum dimension of the part in question.
Circles and Rings
For profiled steel circles and rings length L, will be understood to be the outside diameter of the part in question and tolerances will be as given in Table 1.
All profiling tolerances given in Table 1 are inclusive e.g. 4mm shall be understood to mean +/-2mm, but by arrangement may be defined as +4/-0mm or +0/-4mm.
Table 1. – Length and Width Tolerance for Profiled Steel Plates |
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LENGTH L |
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Material Thickness |
Under 500mm |
500mm to under 1500mm |
1500mm to under 3000mm |
3000m and over |
Up to 10mm |
3mm |
3mm |
3mm |
4mm |
Over 10mm to 25mm |
3mm |
3mm |
4mm |
5mm |
Over 25mm to 50mm |
3mm |
4mm |
4mm |
5mm |
Over 50mm to 100mm |
4mm |
5mm |
5mm |
6mm |
Over 100mm to 200mm |
5mm |
5mm |
6mm |
6mm |
Over 200mm |
5mm |
6mm |
6mm |
6mm |
Dimensional Squareness
For rectangular profiled steel plates, where length L is defined as the greater of the two dimensions, the difference between the two diagonally opposite corner to corner dimensions shall be no greater than those shown in Table 2.
For non-rectangular shaped profiled steel plates, due to the difficulty in defining squareness, any specific requirement should be agreed with Charles Day Steels Ltd prior to order placement.
Table 2. – Dimensional Squareness Tolerances for Profiled Steel Plates |
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Difference between the corner to corner dimensions for Length L |
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Material Thickness |
Under 1000mm |
1000mm to Under 2000mm |
2000mm to Under 3000mm |
3000mm and over |
Up to 40mm |
4mm |
5mm |
6mm |
7mm |
Over 40mm to 100mm |
5mm |
5mm |
6mm |
7mm |
Over 100mm |
6mm |
6mm |
7mm |
8mm |
Profiling Edge Squareness
The deviation for edge squareness accuracy, W, for profiled steel plates shall not exceed the value shown in Table 3.
Table 3. – Profiling Edge Squareness |
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Material Thickness |
Deviation W |
Up to 10mm |
0.5mm |
Over 10mm to 25mm |
1mm |
Over 25mm to 50mm |
2mm |
Over 50mm to 100mm |
3mm |
Over 100mm to 200mm |
4mm |
Over 200mm |
5mm |