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
	LENGTH L
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
	Difference between the corner to corner dimensions for Length L
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
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