Method for determining Ti addition amount of 550MPa grade Ti micro-alloying high-strength weathering steel
A technology of micro-alloying and weathering steel, which is applied in the field of high-strength weathering steel production, can solve problems such as large performance impact, product performance fluctuation, and quantity change, and achieve the effect of enhancing competitiveness and improving stability
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Embodiment 1
[0025] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining, 60mm thin slab continuous casting, soaking, high pressure water descaling, 6-stand hot continuous rolling, laminar cooling, coiling, finished product thickness 2mm.
[0026] The chemical composition of steel is: C: 0.057wt.%, Si: 0.41wt.%, Mn: 0.42wt.%, P: 0.025wt.%, S: 0.001wt.%, Cu: 0.26wt.%, Cr: 0.418wt.%, Ni: 0.182wt.%, Alt: 0.0295wt.%, O: 0.0055wt.%, N: 0.0080wt.%:
[0027] Process parameters: billet entering furnace temperature 987-1030°C, furnace exiting temperature 1127-1154°C, final rolling temperature 886-903°C, coiling temperature 593-612°C.
[0028] Based on the above conditions, according to the mathematical model proposed by the present invention, the amount of Ti added is determined to be 0.083wt.%, and the mechanical properties of the obtained steel plate are shown in Table 1.
[0029] Sample No
Embodiment 2
[0031] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining, 55mm thin slab continuous casting, soaking, high pressure water descaling, 6-stand hot continuous rolling, laminar cooling, coiling, finished product thickness 6mm.
[0032] The chemical composition of steel is: C: 0.060wt.%, Si: 0.37wt.%, Mn: 0.41wt.%, P: 0.010wt.%, S: 0.008wt.%, Cu: 0.27wt.%, Cr: 0.407wt.%, Ni: 0.186wt.%, Alt: 0.028wt.%, O: 0.0020wt.%, N: 0.0040wt.%:
[0033] Process parameters: billet entering furnace temperature 979-1013°C, furnace exiting temperature 1131-1160°C, final rolling temperature 881-907°C, coiling temperature 587-615°C.
[0034] Based on the above conditions, according to the mathematical model proposed by the present invention, the amount of Ti added is determined to be 0.078wt.%, and the mechanical properties of the obtained steel plate are shown in Table 2.
[0035] Sample No
Embodiment 3
[0037] Process flow: 150t ultra-high electric furnace smelting, 150t ladle furnace refining, 58mm thin slab continuous casting, soaking, high pressure water descaling, 6-stand hot continuous rolling, laminar cooling, coiling, finished product thickness 4mm.
[0038] The chemical composition of steel is: C: 0.063wt.%, Si: 0.39wt.%, Mn: 0.43wt.%, P: 0.035wt.%, S: 0.004wt.%, Cu: 0.26wt.%, Cr: 0.57wt.%, Ni: 0.198wt.%, Alt: 0.031wt.%, O: 0.0035wt.%, N: 0.0060wt.%:
[0039] Process parameters: billet entering furnace temperature 994-1029°C, furnace exiting temperature 1132-1166°C, final rolling temperature 897-918°C, coiling temperature 594-627°C.
[0040] Based on the above conditions, according to the mathematical model proposed by the present invention, the amount of Ti added is determined to be 0.079wt.%, and the mechanical properties of the obtained steel plate are shown in Table 3.
[0041] Sample No
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