Method for determining Ti addition amount of 700MPa grade Ti micro-alloying high-strength weathering steel
A technology of micro-alloying and weathering steel, applied in metal rolling, temperature control, etc., can solve problems such as large performance impact, product performance fluctuation, quantity change, etc., to 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: 0.058wt.%, Si: 0.40wt.%, Mn: 1.0wt.%, P≤0.035wt.%, S: 0.001wt.%, Cu: 0.26wt.%, Cr: 0.42wt.%, 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 0.110wt.%, and the mechanical properties of the obtained steel plate are shown in Table 1.
[0029] The mechanical properties of the steel plates are shown in Table 1.
[0030] ...
Embodiment 2
[0032] 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.
[0033] The chemical composition of steel is: C: 0.060wt.%, Si: 0.37wt.%, Mn: 1.01wt.%, P≤0.029wt.%, S: 0.008wt.%, Cu: 0.27wt.%, Cr: 0.407wt.%, Ni: 0.186wt.%, Alt: 0.028wt.%, O: 0.0020wt.%, N: 0.0040wt.%:
[0034] 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.
[0035] Based on the above conditions, according to the mathematical model proposed by the present invention, the amount of Ti added is determined to be 0.10wt.%, and the mechanical properties of the obtained steel plate are shown in Table 2.
[0036] The mechanical properties of the steel plates are shown in Table 2.
[0037] ...
Embodiment 3
[0039] 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.
[0040] The chemical composition of steel is: C: 0.063wt.%, Si: 0.39wt.%, Mn: 1.02wt.%, P≤0.034wt.%, S: 0.004wt.%, Cu: 0.26wt.%, Cr: 0.57wt.%, Ni: 0.198wt.%, Alt: 0.031wt.%, O: 0.0035wt.%, N: 0.0060wt.%:
[0041] Process parameters: billet entering furnace temperature 994-1037°C, furnace exit temperature 1142-1166°C, final rolling temperature 892-916°C, coiling temperature 604-627°C.
[0042] Based on the above conditions, according to the mathematical model proposed by the present invention, the amount of Ti added is determined to be 0.103wt.%, and the mechanical properties of the obtained steel plate are shown in Table 3.
[0043] The mechanical properties of the steel plates are shown in Table 3.
[0044] Sam...
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