Production method of easily-shaped high-strength medium-thickness steel plate
A production method and technology for thick steel plates, which are applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as difficulty in meeting actual use requirements, uncontrolled yield ratio, poor cold bending performance, etc. The effect of satisfying the bending performance, reducing the yield ratio and improving the welding performance
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[0026] Example 1: Production method of 20mmQ890E steel plate
[0027] The chemical composition of steel is shown in Table 3.
[0028] Table 3 The actual composition of 20mm Q890E steel plate%
[0029] chemical compositionC Si MnPS Nb+V+ Ti Cr+ Mo Alt Pcm CEV Actual performance 0.080.201.690.0130.0010.1050.910.0320.250.58
[0030] Main process steps:
[0031] a. The sulphur content of the molten iron is S≤0.020%, and the temperature is ≥1250℃. The slag must be removed before the molten iron enters the converter. The target of converter end point control: CT coordinated tapping, P 0.013%, S 0.019%; strict slag tapping, slag thickness ≤50mm, tapping time 6min, tapping 1 / 5 with alloy, tapping 2 / 5 with alloy ; After tapping, drive into Al wire 260m for deoxidation.
[0032] b. The molten steel is energized for 22 minutes in the LF furnace, the total argon blowing time is 42 minutes, and the white slag retention time is 16 minutes. Feed the Al line and adjust Alt, the argon station ha...
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[0038] Example 2: Production method of 30mm Q890E steel plate
[0039] The chemical composition of steel is shown in Table 4.
[0040] Table 4 The composition performance of 30mm Q890E steel plate%
[0041] chemical compositionC Si MnPS Nb+V+ Ti Cr+ Mo Alt Pcm CEV Actual performance 0.080.231.670.0130.0030.1100.930.0340.260.59
[0042] a. The sulphur content of the molten iron is S≤0.020%, and the temperature is ≥1250℃. The slag must be removed before the molten iron enters the converter. End point control target for converter: CT coordinated tapping, P 0.012%, S 0.016%; strict slag tapping, slag thickness ≤50mm, tapping time 6min, tapping 1 / 5 with alloy, tapping 2 / 5 with alloy ; After tapping, drive into Al wire 300m to deoxidize.
[0043] b. The molten steel is energized for 27 minutes in the LF furnace, the total argon blowing time is 44 minutes, and the white slag retention time is 15 minutes. Feed the Al line and adjust Alt, the argon station has finished processing molten...
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