A method for producing thick-gauge flaw-proof steel plate with low compression ratio
A technology with low compression ratio and thick specifications, which is applied in the field of metallurgy, can solve problems such as the inability to press the core of the billet, unqualified steel plate flaw detection, and low production efficiency, and achieve the effect of improving production assurance capabilities
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Embodiment 1
[0021] This embodiment is a specific implementation production process of 100mmQ345B with a compression ratio of 2.5. The selected process is suitable for the production of 100mm Q345B steel plate by 4300 wide and thick plate rolling mill. The thickness of the billet is 250mm, and the thickness of the finished plate is 100mm.
[0022] (1) Steelmaking: the steelmaking furnace adopts a 210-ton converter, the tapping amount is 215.82 tons, the weight percentage of carbon during tapping is 0.068%, and the tapping temperature is 1644°C;
[0023] (2) The LF treatment period is 56 minutes, the heating time is 24 minutes, the reaching temperature is 1566°C, the leaving temperature is 1612°C, and the mass percentage of Σ(FeO+MnO) is 1.2%;
[0024] (3) The RH vacuum treatment time is 20 minutes, and the vacuum time is required to be 12 minutes below 200Pa;
[0025] (4) Pouring section: 250×2000mm, using dynamic soft reduction technology, the reduction section is 3 sections, each secti...
Embodiment 2
[0043] This embodiment is a specific implementation production process of 120mmQ345D-Z25 with a compression ratio of 2.08. The selected process is suitable for the production of 120mmQ345D-Z25 steel plate by 4300 wide and thick plate rolling mill. The thickness of the billet is 250mm, and the thickness of the finished plate is 120mm.
[0044] (1) Steelmaking: the steelmaking furnace adopts a 210-ton converter, the tapping amount is 217.77 tons, the weight percentage of carbon during tapping is 0.062%, and the tapping temperature is 1652°C;
[0045] (2) The LF treatment period is 58 minutes, the heating time is 22 minutes, the reaching temperature is 1569°C, the leaving temperature is 1609°C, and the mass percentage of Σ(FeO+MnO) is 1.3%;
[0046] (3) The RH vacuum treatment time is 22 minutes, and the vacuum time is required to be 15 minutes below 200Pa;
[0047] (4) Pouring section: 250×2000mm, using dynamic soft reduction technology, the reduction section is 3 sections, ea...
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