Medium-frequency Induce Heat Treatment Principle of LSAW Steel Pipe

Keywords:Medium-frequency Induce Heat Treatment Principle of LSAW Steel Pipe
Medium-frequency induce heat treatment principle of lsaw steel pipe is a rapid thermal processing method. It is the use of high / medium frequency currents in the steel and general flame heating heat treatment has many advantages over metal fine grain microstructure, the steel pipe before quenching rapidly heated to a temperature of austenite can form fine horse quenching s body tissue, can be formed when normalized fine grain ferrite E pearlite structure. Because induction heating tempering time is short, small particles of carbide precipitation, and evenly distributed in the martensitic matrix of fine-grained, this structure is particularly advantageous casing against corrosion.

If steel after quenching and tempering heat treatment, mechanical properties superior to other methods in addition to high-temperature thermomechanical treatment. After a high-strength steel perforating gun gun seamless steel pipe, medium frequency induction heating heat treatment and conventional heating heat treatment, compare their mechanical properties, induction heating after quenching the mechanical performance is better than ordinary heat transfer index on the quality process. And conventional heating quenching, such as the cooling medium water pipe can not otherwise easy to crack. While induction heating, with water as the cooling medium, the inner and outer surfaces of the crack pipe never happened. This is because when the heat from induction hardening tempering phenomenon, helping to eliminate quenching stress, easy to produce quenching cracks. Pipe performance is very uniform, good quality and appearance of the entire root canal. Induction heating pipe during the heat treatment, the heating time is different in different kinds of steel pipe heating shortest. Temperature quickly, and within a given time only a small amount of iron oxide, substantially no decarbonization.

After the induction heating heat treatment of steel pipe, steel ships also have bent, but the degree of curvature smaller than many conventional roller hearth furnace or a walking beam furnace, which, after the straightening is very advantageous, especially for API standard the casing corrosion and high strength steel, straightening stress is small, corrosion resistance and cracking resistance is high. After induction heat treatment, the degree of curvature depends on many factors Steel Pipe original curvature, diameter, during heating mode of motion, and the cooling conditions. Generally, the heat treatment of the steel pipe before bending, the smaller the diameter, the more flexible after the heat treatment. Thus, before the heat treatment of the steel tube to maintain a certain flatness is necessary. Steel pipe straight forward manner in the heating process tends to become curved, spiral steel pipe way forward is not easy to bend. The cooling in the bending effect is also great, uneven cooling, pipe bends also variable.
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