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The ferrite structure based in the state of alloy steel pipe. Chromium content of 11% to 30%, has a body-centered cubic crystal structure. Type of steel generally do not contain nickel, sometimes also contains a small amount of Mo, Ti, Nb wait until the element type of steel with thermal conductivity, expansion coefficient, good oxidation resistance, excellent resistance to stress corrosion characteristics, mostly used in the manufacture of resistance to atmospheric , water vapor, water and the oxidizing acid corrosion of components. This type of alloy steel pipe to the poor plasticity, ductility and corrosion resistance after welding significantly reduced and other shortcomings, thus limiting its application. Refining technology (AOD or VOD) applications interstitial elements such as carbon, nitrogen can be greatly reduced, thus making this type of steel is widely available.