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A kind of steel for producing easy-to-weld extra-thick bridges by continuous casting slab and its production method
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A technology for bridge steel and production method, applied in the field of bridge steel, can solve the problems of low die casting yield and poor weldability in normalizing process production, so as to improve welding performance, make up for the loss of solid solution strengthening, and reduce the cost of steel plates Effect
Active Publication Date: 2019-03-29
SHOUGANG CORPORATION
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[0005] The purpose of the present invention is to provide a continuous casting slab for producing easy-to-weld extra-thick bridge steel and its production method, which solves the problems of low yield in traditional die casting and poor weldability in normalizing production
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Embodiment 1
[0023] 120mm345MPa extra-thick bridge steel plate. This steel grade is designed with low-carbon Nb, V, Ti microalloying components, and the specific mass percentages are as follows: C: 0.04%, Si: 0.25%, Mn: 1.44%, Cu: 0.02%, Ni: 0.35%, Cr: 0.04%, V: 0.003%, Nb: 0.03%, Ti: 0.013%, no B, Al elements are deliberately added, and P, S elements are controlled, and the balance is Fe and unavoidable impurities.
[0024] The specific steps and parameters of the above-mentioned steel plate production method are as follows:
[0025] 1. After molten iron treatment, converter, LF refining, continuous casting into 400mm continuous casting slab, the continuous casting slab is stacked and cooled for 72 hours.
[0026] 2. Before the continuous casting slab enters the heating furnace, thick-gauge hot-rolled common slabs should be arranged before and after it, so as to ensure the self-adaptation of the rolling mill, and at the same time ensure the stacking effect and self-tempering of the steel...
Embodiment 2
[0036] In this embodiment, the composition, smelting, continuous casting, rolling rhythm control, and heating system are the same as those in Embodiment 1.
[0037] After exiting the heating furnace and descaling by the dephosphorization machine, it quickly enters the roughing mill for rolling in the recrystallization zone, adopts the strategy of low speed and large reduction, and adopts the process of cooling the surface of the steel plate with dephosphorization water in each pass to promote core deformation; The temperature thickness is 230mm, and the middle roller table is air-cooled to 770°C to start rolling in the non-recrystallization zone. Roll to the target thickness of 150mm, and the final rolling temperature is 762°C. After that, it quickly went offline and piled cold. After unstacking, conduct flaw detection on the whole board, the flaw detection performance is good, and conduct tensile and impact performance, cold bending and Z-direction performance inspection on t...
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Abstract
The invention discloses continuous casting billet production easy-welding super-thick steel used for a bridge and a production method thereof, and belongs to the technical field of steel used for bridges. The steel comprises the chemical components of, by weight, 0.035-0.045% of C, 0.20-0.50% of Si, 1.20-1.64% of Mn and the balance Fe and inevitable impurities. The production method comprises thesteps that continuous casting billets are fed into a heating furnace to be heated, wherein the heating temperature is 1140-1180 DEG C; two-stage rolling is performed, specifically, steel plates subjected to finish rolling are fed into an ACC to be subjected to oscillating cooling, wherein the initial cooling temperature is 730-750 DEG C, and the finish cooling temperature is 320-390 DEG C; and off-line stack cooling is performed for more than 72 h. The continuous casting billet production easy-welding super-thick steel used for the bridge and the production method thereof have the advantages that the yield is increased while normalizing is avoided, and the steel plate cost is lowered; and the carbon content is decreased, and accordingly, the welding performance of the steel is improved.
Description
technical field [0001] The invention belongs to the technical field of steel for bridges, and in particular relates to a steel for super-thick bridges that can be welded easily by continuous casting slabs and a production method thereof. In particular, the invention relates to a bridge steel of 120-150 mm in TMCP state which is easy to be welded by continuous casting slabs and a production method thereof. Background technique [0002] With the planning and implementation of large-scale railway projects such as the national "four vertical and four horizontal" high-speed rail networks, coastal high-speed rail networks, and capital and provincial capital city high-speed rail networks, the rapid development of high-speed railways has greatly promoted the construction of railway bridges. Its superior technical and economic performance has become the development direction of bridge innovative design. In order to meet the higher requirements of modern bridge structures in terms of...
Claims
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