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A production method for rolling extreme-size extra-thick plates using continuous casting slabs
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A technology of limit specifications and production methods, which is applied in the production field of using continuous casting slabs to roll limit specifications of extra-thick plates, can solve the problems of high cost of extra-thick plates, and achieve the effect of reducing production costs
Active Publication Date: 2018-08-10
SHOUGANG JINGTANG IRON & STEEL CO LTD
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[0007] The purpose of the present invention is to provide a production method for rolling limit-sized extra-thick plates by continuous casting slabs, which solves the problem of high cost of producing extra-thick plates by using ingots
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Embodiment 1
[0018] Production of 200mm×2400mm Q345B steel plate with 400×2250mm continuous casting slab, furnace batch number 6N05470C22:
[0019] 1. Refining: Control the composition of the slab: by mass percentage,
[0020] C％
Si%
Mn%
P％
S％
Alt%
Fe and other impurities%
0.154
0.36
1.4
0.018
0.002
0.033
98.033
[0021] 2. Use the RH furnace to vacuum degas, the vacuum treatment time is 20 minutes, the deep vacuum time is 15 minutes, the vacuum pressure is 0.02Kpa, and no alloy is added during the RH treatment process.
[0022] 3. The continuous casting process uses a dynamic soft reduction process, with a light reduction rate of 0.9mm / m and a light reduction of 3mm. The low-magnification structure center segregation rating of the slab reaches Class C 1.0:
[0023]
[0024] 4. After the steel billets come off the assembly line, they are stacked and cooled slowly, and the stacking cooling time is 100 hours.
[0025] 5. The bil...
Embodiment 2
[0036] Production of 220mm×2300mm Q345B steel plate with 400×2400mm continuous casting slab, furnace batch number 7Q10163C12:
[0037] 1. Refining: Control the composition of the slab: by mass percentage,
[0038] C％
Si%
Mn%
P％
S％
Alt%
Fe and other impurities%
0.15
0.36
1.41
0.011
0.003
0.036
98.03
[0039] 2. Use the RH furnace to vacuum degas, the vacuum treatment time is 19 minutes, the deep vacuum time is 14 minutes, and the vacuum pressure reaches 0.03KPa. In addition, no alloy is added during the RH treatment process.
[0040] 3. The continuous casting process uses a dynamic soft reduction process, with a light reduction rate of 0.9mm / m and a light reduction of 3mm. The low-magnification structure center segregation rating of the slab reaches Class C 1.0:
[0041]
[0042] 4. After the steel billets come off the assembly line, they are stacked and cooled slowly, and the stacking cooling time is 102 hours.
...
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Abstract
The invention provides a production method for rolling a super-thick steel plate of the limit specification through a continuous casting billet and belongs to the technical field of steel plate techniques. According to the production method, through reasonable composition design and strict control over technological procedures including RH vacuum degassing, continuous casting, steel billet stack cooling, rolling and water cooling, and steel plate stack cooling, the low-alloy super-thick steel plate with the thickness being larger than or equal to 200 mm and with performance and flaw detection guaranteed is produced through the continuous casting billet. The production method has the advantages that low-cost composition design and strict technological parameter control are adopted, and compared with the mode that the super-thick steel plate is produced through a cast ingot, the production cost is substantially reduced.
Description
technical field [0001] The invention belongs to the technical field of steel plate technology, and in particular relates to a production method for rolling limit-specification extra-thick plates by using continuous casting slabs. Background technique [0002] It has always been a difficult point in the field of medium and heavy plate technology to produce extra-heavy plates by continuous casting slabs. Because the defects of continuous casting slabs are concentrated in the center, the mechanical properties and flaw detection quality of the steel plates are difficult to meet the requirements due to the small compression ratio in the production of extra-thick plates. However, compared with the use of ingots to produce extra-thick plates, continuous casting slabs have always been the direction pursued in the field of steel rolling technology because of their high yield and low production difficulty. In the early stage, there were also related patents on the use of continuous c...
Claims
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