Rolling technology for high-carbon steel in thin slab casting and rolling
A thin slab continuous casting, medium and high carbon technology, applied in the field of steel rolling process, can solve the problems of fast cooling speed of thin slab, increase in product flow, and reduce production efficiency, and achieve the advantages of avoiding annealing process, simplifying production process and improving band structure. Effect
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Embodiment 1
[0024] The 30CrMo strip steel is produced in the 7-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The main chemical composition of strip steel 30CrMo is: 0.3%C, 0.28%Si, 0.5%Mn, 0.9%Cr, 0.2%Mo, and the product thickness is 3mm. The thickness of the slab in the continuous casting process is 60mm. The rolling reductions of each pass are shown in Table 1.
[0025] Table 1 The reduction rate of each pass in Example 1
[0026]
F1
F2
F3
F4
F5
F6
F7
55%
58%
0
38%
28%
25%
20%
[0027] The soaking temperature is 1080°C, and the soaking time is 30 minutes. The dephosphorization pressure is set to 30Mpa, the rolling start temperature is 980°C, the finish rolling temperature is 750°C, the cooling wat...
Embodiment 2
[0037] The strip steel 50CrV4 is produced in the 6-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The chemical composition of strip steel 50CrV4 is: 0.5%C, 0.25%Si, 0.8%Mn, 1.0%Cr, 0.15%V, and the product thickness is 4mm. The thickness of the slab in the continuous casting process is 58mm, and the rolling reduction of each pass is shown in Table 4.
[0038] Table 4 The reduction rate of each pass in Example 2
[0039]
F1
F2
F3
F4
F5
F6
50%
55%
0
35%
30%
25%
[0040] The soaking temperature is 1120°C, and the soaking time is 35 minutes. The dephosphorization pressure is set at 25Mpa, the rolling start temperature is 1030°C, the finish rolling temperature is 800°C, the cooling water pressure betwee...
Embodiment 3
[0050] The 30CrMo strip steel is produced in the 7-stand thin slab continuous casting and rolling production line. The steps include: continuous casting, soaking, descaling, rolling, cooling between stands, laminar cooling, coiling, and slow cooling in the heat preservation cover. process. The main chemical composition of strip steel 30CrMo is: 0.3%C, 0.28%Si, 0.5%Mn, 0.9%Cr, 0.2%Mo, and the product thickness is 3mm. The thickness of the slab in the continuous casting process is 60mm. The rolling reductions of each pass are shown in Table 7.
[0051]Table 7 The reduction rate of each pass in Example 3
[0052]
F1
F2
F3
F4
F5
F6
F7
56%
58%
5%
38%
28%
25%
20%
[0053] The soaking temperature is 1050°C, and the soaking time is 40 minutes. The dephosphorization pressure is set to 30Mpa, the rolling start temperature is 950°C, the finish rolling temperature is 700°C, the cooling wat...
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