Production method of low-compression-ratio super-strength steel Q960E super-thick plate
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A technology of ultra-high-strength steel and production methods, applied in the field of steelmaking, can solve the problems of low steel ingot rolling yield, high alloy composition content, high production cost, etc., and achieve the effects of short production cycle, good performance uniformity and low cost
Inactive Publication Date: 2019-11-08
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD +1
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[0005] CN 105177424A discloses a high-strength extra-thick steel plate and its production method, whic
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[0021] Example 1: Production of 90mmQ960E steel plate
[0022] The composition mass percentage of steel is C=0.16, Si=0.22, Mn=1.22, P=0.011, S=0.0021, Nb=0.029, V=0.050, Ti=0.015, Als=0.030, Cr=0.62, Mo=0.51, Ni=1.15, B=0.0015, CEV=0.67, the balance is Fe and other trace elements.
[0023] The production process steps include:
[0024] (1) The converter and refining are controlled in accordance with clean steel production. The hydrogen content of molten steel is 1.3ppm, the total oxygen content is 8ppm, and the nitrogen content is 35ppm. Continuous casting overheating degree 13~15℃, cross section 300mm×2270mm, electromagnetic stirring current 265A, frequency 6HZ, dynamic soft reduction 6.3mm.
[0025] (2) Rolling process: After the slab is heated by the heating furnace, the tapping temperature is 1240°C, the soaking time is 41 minutes, and the three-pass reduction after rough rolling and widening is 32mm, 37mm and 38mm, and the reduction rate is 14 %, 19% and 24%. The thickness of...
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[0028] Example 2: Production of 120mmQ960E steel plate
[0029] The composition mass percentage of steel is: C=0.17, Si=0.22, Mn=1.25, P=0.010, S=0.0018, Nb=0.026, V=0.052, Ti=0.018, Als=0.025, Cr=0.64, Mo=0.53 , Ni=1.17, B=0.0014, CEV=0.68, the balance is Fe and other trace elements. The production process steps include:
[0030] (1) The converter and refining are controlled in accordance with clean steel production. The hydrogen content in molten steel is 1.0ppm, the total oxygen content is 9ppm, and the nitrogen content is 30ppm. Continuous casting overheating 11~14℃, cross section 300mm×2270mm, electromagnetic stirring current 267A, frequency 5.5HZ, dynamic soft reduction 6.5mm.
[0031] (2) Rolling process: After the slab is heated by the heating furnace, the tapping temperature is 1235℃, the soaking time is 45 minutes, and the three passes after the rough rolling and widening, the reductions are 34mm, 43mm and 45mm, and the reduction rates are 13 respectively. %, 18% and 23%...
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Abstract
The invention discloses a production method of a low-compression-ratio super-strength steel Q960E super-thick plate. The steel comprises, by mass percent, 0.15 to 0.20 of C, 0.15 to 0.35 of Si, 1.0 to1.50 of Mn, not larger than 0.012 of P, not larger than 0.003 of S, 0.020 to 0.035 of Nb, 0.030 to 0.060 of V, 0.010 to 0.025 of Ti, 0.020 to 0.045 of Als, 0.50 to 0.80 of Cr, 0.40 to 0.60 of Mo, 1.00 to 1.40 of Ni, 0.0008 to 0.0025 of B, not larger than 0.68 of CEV and the balance Fe and other trace elements. The process comprises the steps of molten iron pretreatment, converter smelting, LF external refining, VD vacuum treatment, continuous casting, heating, rolling, straightening, quenching, tempering, finishing, property detection and flaw detection. Limiting of the super-strength steel compression ratio of the tradition plate blank production is broken through, the large-thickness super-strength steel is produced with the rolling compression ratio of 2.2 to 3.0, the property difference of the steel plate in the thickness direction is small, and according to the mechanical properties, the yield strength is smaller than or equal to 30 MPa, the tensile strength is smaller than or equal to 25 MPa, the ductility is smaller than or equal to 2%, the -40 DEG C longitudinal impact power is smaller than or equal to 20 J, and the transverse impact power is smaller than or equal to 15 J.
Description
technical field [0001] The invention belongs to the technical field of steelmaking, in particular to a method for producing ultra-high-strength steel Q960E extra-thick plates with a low compression ratio. Background technique [0002] With the development of large-scale and heavy-duty coal mining machinery and construction machinery, low-strength steel plates and ordinary-thickness steel plates can no longer meet the production needs of some special structural parts. Limited by the compression ratio requirements of thick plate production, steel ingot rolling and continuous casting slab compound rolling are mostly used in the production of extra heavy plate, which has high production cost, long cycle time and low production efficiency. [0003] CN 102330017A discloses a method of using continuous casting slabs to produce extra-thick steel plates under the condition of small compression ratio. The strength level of the produced steel plates is Q345, the yield strength is about...
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