Research progress on online isothermal heat treatment(QM)technology for special steel wire
Online isothermal heat treatment(QM)of special steel wire refers to a new type of online isothermal heat treatment technology that uses the residual heat from rolling to directly immerse the wire into a constant temperature salt bath to control cooling after wire drawing.QM technology has the characteristics of fast cooling rate and wide temperature range,and can be used for special steel wire products such as ultra-high strength high-carbon pearlite steel,medium-carbon bainite non-quenched and tempered steel,and non-annealed low-carbon alloy steel.Ultra-high strength high-carbon pearlite steel wire rod is used to manufacture galvanized aluminum steel wire for bridge cable,which can achieve tensile strength of 2 130 MPa and torsion times of more than 18 times.Medium-carbon bainite non-quenched and tempered steel obtains the full bainite structure through the controlled cooling process without adding precious alloying elements,which meets the strength requirements of standard parts in strength classes 8.8,and can achieve 1/6 cold top forging without cracking.After QM treatment,the section area reduction rate of non-annealed low-carbon alloy steel is significantly higher than that of the traditional slow cooling process,and the de-formation capacity is higher,which can realize annealing-free drawing processing.QM technology eliminates the sec-ondary heat treatment and realizes the reduction of alloying elements,which has broad market prospects under the background of"carbon peaking"and"carbon neutrality".The QM process flow,technical principles,and the latest research and development progress of related products are introduced.
special steelwire rodonline isothermal heat treatmentultra-high strengthlow carbon emission
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