A method for controlling the microstructure of q345b thick slab
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A control method and billet technology, applied in the field of Q345B thick slab structure control, can solve problems such as staying in the experimental stage, and achieve the effects of low implementation difficulty, simple process and improved steel performance
Active Publication Date: 2019-10-29
ANGANG STEEL CO LTD
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Problems solved by technology
Even if the technologies that have been reported, most of them are still in the experimental stage and have not been formally applied in industrial production. Exploring a furnace charging method to realize the controllable structure of continuous casting slabs will bring great benefits to solve the above problems and improve the performance of steel materials. new way
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Embodiment 1
[0023] The casting speed of the billet is 1.3m / min, and the surface structure of the planed continuous casting billet is bainite + martensite. The corresponding cooling water distribution Q of each section of the continuous casting machine is shown in Table 1.
[0024]
[0025]
[0026] After the continuous casting slab was off-line, samples were taken from the surface layer of the slab, processed, polished and corroded, and observed under a metallographic microscope. The results were as follows: figure 1 As shown, its surface structure is bainite + martensite.
Embodiment 2
[0028] The casting speed of the billet is 1.4m / min, and the surface structure of the planed continuous casting billet is ferrite+pearlite+bainite. The corresponding cooling water distribution Q of each section of the continuous casting machine is shown in Table 1.
[0029] Caster location Q l / min Caster location Q l / min section 300 Seven paragraphs 矫直
[0030] After the continuous casting slab was off-line, samples were taken from the surface layer of the slab, processed, polished and corroded, and observed under a metallographic microscope. The results were as follows: figure 2 As shown, its surface structure is ferrite + pearlite + bainite.
Embodiment 3
[0032] The slab casting speed is 1.4m / min, and the surface structure of the planned continuous casting slab is ferrite + pearlite after it goes off the production line. The corresponding cooling water distribution Q of each section of the continuous casting machine is shown in Table 1.
[0033] Caster location Q l / min Caster location Q l / min section 300 Seven paragraphs 矫直
[0034] After the continuous casting slab was off-line, samples were taken from the surface layer of the slab, processed, polished and corroded, and observed under a metallographic microscope. The results were as follows: image 3 As shown, its surface structure is ferrite + pearlite.
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Abstract
The invention discloses a method for controlling the casting blank structure of a Q345B thick plate. The method comprises the steps that according to the casting-blank casting speed and different surface structures after a continuous casting blank is discharged from a line, the water distribution quantities Q of cooling water of all sections of a continuous casting machine are determined accordingly. The casting speed is 1.25-1.6 m / min, Q of the first section is 200-400 l / min, Q of the second section to the fourth section is 400-600 l / min, and Q of the five section<straightening> to the eightsection<straightening> is 100-300 l / min. The surface structure is bainite and martensite, Q of the ninth section<level> is 600-800 l / min, and Q of the tenth section<level> and the eleventh section<level> is 800-1200 l / min. The surface structure is ferrite, pearlite and bainite, Q of the ninth section<level> is 400-600 l / min, Q of the tenth section<level> and the eleventh section<level> is 600-800l / min. The surface structure is ferrite and pearlite, Q of the ninth section<level> to the eleventh section<level> is 200-400 l / min. The method for controlling the casting blank structure of the Q345Bthick plate is simple and easy, transverse cracks and hot-delivery cracks of microalloyed steel are reduced, and the quality of a casting blank and the properties of the steel are improved.
Description
technical field [0001] The invention belongs to the technical field of continuous casting, and in particular relates to a method for controlling the structure of a Q345B thick slab. Background technique [0002] Micro-alloy steel continuous casting slabs are prone to cracks during bending or straightening operations. In addition, when micro-alloy steel continuous casting slabs are hot-delivered, if the hot-delivery process is unreasonable, rolling cracks or cold-bending cracks are also prone to occur. , how to solve and understand the cracks produced by microalloyed steel continuous casting slabs has become a research hotspot. [0003] From the point of view of its generation mechanism, the transverse cracks on the surface of microalloyed steel slabs are related to the surface structure during bending or straightening operations. Whether it is the optimization of the steel composition or the optimization of the secondary cooling process and the corner of the crystallizer, i...
Claims
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Application Information
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