Stainless steel microstructure according to points, can generally be divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel three categories, in addition to semi-ferritic, martensitic stainless steel half.

Commonly used austenitic stainless steel, stainless steel and ordinary steel, just as a kind of iron, carbon-based iron - carbon alloy, in order to prevent corrosion in steel added chromium, nickel, manganese, molybdenum, titanium, niobium , copper, cobalt and other elements, which determine the corrosion resistance of stainless steel is the main element chromium and nickel.

General austenitic stainless steel carbon content should be less than 0.14%, the chromium content is generally 13% -18%, nickel content of about 14%.
Why, in the medium stainless steel corrosion in a relatively short period of time it does not rust? The main reason is nickel chromium oxide film on the stainless steel surface to protect the stainless steel does not rust.

When cutting stainless steel with oxygen at a temperature preheat flame in a stainless steel surface has a thin oxide film, that said high melting point, viscosity of chromium oxide on the stainless steel surface cover, a metal combustion prejudice , it can not properly cut, chromium oxide melting point of an oxide film 1990
0C, while the general austenitic stainless steel melting point itself is 1550 0C. Thus, the melting point of the oxide film is greater than the melting point of the base metal substrate to cutting difficult.
So how to cut stainless steel with oxygen it?
Due to the formation of chromium oxide on the stainless steel surface oxide, oxide film with high melting point, we will use flammable substances iron to melt it, it can be cut to achieve the purpose.
1, the basic principle of flame cutting iron
Iron flame cutting is directed to a method of cutting the choice of oxyacetylene flame can not be completed stainless steel, cast iron, high-carbon steel cutting heat-resistant, it is the oxygen - acetylene flame cutting of the basic principles in the form of simulation.
First, oxygen - acetylene torch into powder feeder, cutting powder spray to the cutting line, played combustion fluxing action, increased oxidative cleavage reaction of combustion, to do a comprehensive presentation on the restructuring method in teaching.
Temperature iron with oxygen generated during combustion is generally 2000
About 0C, was added when cutting oxygen stream is preheated iron piece was cut at this iron oxide plays a violent reaction in the flame and emit a lot of heat, constantly cutting continue to transport iron, the upper notched both produce melting and at the same time slag is generated, the temperature reached the upper portion cut notched lower part of the successful completion of cutting.

2, iron flame cutting method
Basic iron flame cutting method with oxygen - acetylene cutting mild steel method, except that the form that it is provided in an upper portion of the torch apparatus, cut along the cutting oxygen powder output simultaneously. First, adjust the mix well before cutting acetylene and oxygen to adjust the flame to become neutral flame, turn on the shunt switch on the entrainment means, the oxygen flow into the feed powder room, cutting powder normal injection to be cut above the workpiece through a nozzle, preheated once preheating temperature reaches the combustion start cutting.

3, stainless steel iron flame cutting Characteristics
Iron stainless steel flame cutting method compared with plasma cutting, the device having low prices, energy saving, simple equipment, easy operation, wide use of surface and so on. Now two different cutting methods, for example, to see the power saving data.
Cutting method Cutting speed voltage and current power consumption of gas consumption cut powder
Plasma cutting 1502603004002400
Iron flame cutting 0400 0.2