Heating method for casting blank corner part
A heating method and corner technology, which is applied in the field of metallurgy, can solve the problems of edge quality degradation, large amount of trimming, and easy cracks on the edge, so as to reduce the degree of generation and cracking, increase the temperature of the slab, and avoid edge cracking. cracking effect
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[0029] Example 1
[0030] A method for heating the corners of a cast slab, which uses a coal-oxygen lance in the continuous casting equipment. figure 1 As shown, the continuous casting equipment includes stopper rod 1, tundish 2, immersion nozzle 3, crystallizer 4, the first group of reduction devices R1, the second group of reduction devices R2, secondary cooling 1~2 stage A, secondary cooling Section 3-8 B, tension straightening device 5, coal oxygen lance 6, cutting device 7, specifically including the following steps:
[0031] (1) The billet material is Q195 steel;
[0032] (2) The control gas and oxygen flow range is, the total flow before the straightening roll is 500m of coke oven gas 3 / h-oxygen 400m 3 / h, the total flow before the bending roll is 700m of coke oven gas 3 / h-oxygen 560m 3 / h;
[0033] (3) The distance between the nozzle of the coal oxygen lance 6 and the corner is 100mm;
[0034] (4) The thickness of the cast slab is 100mm;
[0035] (5) The corner supplementary ...
Example Embodiment
[0037] Example 2
[0038] A method for heating the corners of a cast slab. The arrangement of the coal oxygen lance in the continuous casting equipment is the same as that of Example 1, and specifically includes the following steps:
[0039] (1) The billet material is Q235A steel;
[0040] (2) The control gas and oxygen flow range is, the total flow before the straightening roll is 400m of coke oven gas 3 / h-oxygen 320m 3 / h, the total flow before the bending roll is 500m of coke oven gas 3 / h-oxygen 400m 3 / h;
[0041] (3) The distance from the nozzle of the coal oxygen lance to the corner is 120mm;
[0042] (4) The thickness of the cast slab is 50mm;
[0043] (5) The corner supplementary heat is adjusted by gas flow and flame distance, manual operation, eight coal oxygen lances have linkage and single-action design, when the coal oxygen lances are ignited, the oxygen should be turned on at a small flow for a few seconds, and then the gas should be ignited. When the flame is turned off...
Example Embodiment
[0045] Example 3
[0046] A method for heating the corners of a cast slab. The arrangement of the coal oxygen lance in the continuous casting equipment is the same as that of Example 1, and specifically includes the following steps:
[0047] (1) The billet material is Q195 steel;
[0048] (2) The control gas and oxygen flow range is, the total flow before the straightening roll is 800m of coke oven gas 3 / h-Oxygen 800m 3 / h, the total flow before the bending roll is 800m of coke oven gas 3 / h-Oxygen 800m 3 / h;
[0049] (3) The distance from the nozzle of the coal oxygen lance to the corner is 100mm;
[0050] (4) The slab thickness is 120mm;
[0051] (5) The corner supplementary heat is adjusted by gas flow and flame distance, manual operation, eight coal oxygen lances have linkage and single-action design, when the coal oxygen lances are ignited, the oxygen should be turned on at a small flow for a few seconds, and then the gas should be ignited. When the flame is turned off, you should...
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