Continuous casting process capable of relieving internal quality defects of bearing steel bloom
A technology of internal quality and continuous casting process, which is applied in the field of continuous casting process to reduce the internal quality defects of bearing steel blooms, and can solve the problem that the surface of the slab is prone to steps, the subcutaneous cracks of the slab are prone to occur, and the amount of cast slab waste is large. and other problems, to achieve the effect of eliminating channel-type V-shaped segregation, reducing casting rolling force, eliminating transverse cracks and longitudinal cracks
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Embodiment 1
[0027] Embodiment 1: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.
[0028] (1) The section size of bearing steel GCr15 continuous casting slab is 280mm×325mm, the chamfering angle is 60°, and the chamfering slope length is 75mm; the main chemical composition of casting heat is (wt): C 0.98%, Si 0.23 %, Mn 0.25%, P 0.011%, S0.003%, Cr 1.45%.
[0029] (2) The main process parameters of continuous casting are shown in Table 2 and Table 3.
[0030] Table 2: Depression parameters of this embodiment
[0031]
[0032] Table 3: Continuous casting parameters of the present embodiment
[0033]
[0034] (3) The continuous casting slab obtained in this example was tested. The average value of the C range in the center of the slab was 0.045%, the proportion of central porosity ≤ 0.5 was 92%, and the proportion of central shrinkage ≤ 0.5 was 100%. The defect rate was 0.18%. figure 2 It is a c...
Embodiment 2
[0035] Embodiment 2: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.
[0036] (1) The section size of the bearing steel GCr15 continuous casting slab is 280mm×325mm, the angle of the chamfer is 50°, and the length of the slope of the chamfer is 90mm; the main chemical composition of the casting heat is (wt): C 0.95%, Si 0.32 %, Mn 0.45%, P 0.010%, S0.004%, Cr 1.58%.
[0037] (2) The main process parameters of continuous casting are shown in Table 4 and Table 5.
[0038] Table 4: Depression parameters of this embodiment
[0039]
[0040] Table 5: Continuous casting parameters of the present embodiment
[0041]
[0042] (3) The continuous casting slab obtained in this example was tested. The average value of the C range in the center of the slab was 0.042%, the proportion of central porosity ≤ 0.5 was 95%, and the proportion of central shrinkage ≤ 0.5 was 100%. The defect is 0.10%.
Embodiment 3
[0043] Embodiment 3: The continuous casting process for alleviating internal quality defects of bearing steel blooms is specifically described as follows.
[0044] (1) The section size of bearing steel GCr15 continuous casting slab is 200mm×200mm, the chamfering angle is 75°, and the chamfering slope length is 60mm; the main chemical composition of casting heat is (wt): C 1.05%, Si 0.35 %, Mn 0.36%, P 0.010%, S0.003%, Cr 1.65%.
[0045] (2) The main process parameters of continuous casting are shown in Table 6 and Table 7.
[0046] Table 6: Depression parameters of this embodiment
[0047]
[0048] Table 7: Continuous casting parameters of the present embodiment
[0049]
[0050] (3) The continuous casting slab obtained in this example is tested, the average value of C range in the center of the slab is 0.05%, the proportion of central porosity ≤ 0.5 is 90%, the proportion of central shrinkage ≤ 0.5 is 100%, and the corner The defect rate is 0.5%.
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