Thick steel plates for high heat input welding and production method thereof
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A high-energy-input welding and manufacturing method technology, which is applied in the field of iron and steel metallurgy and iron and steel materials, can solve problems such as insufficient improvement of the toughness of the heat-affected zone of welding, and achieve the effect of improving the performance of high-energy-input welding and promoting growth
Active Publication Date: 2014-03-19
BAOSHAN IRON & STEEL CO LTD
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However, in the process of large input energy welding with welding input energy greater than 200kJ / cm, titanium oxide alone is still not enough to improve the toughness of the welding heat-affected zone
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[0056] The present invention will be further described below in conjunction with embodiment.
[0057] In the embodiment of the present invention, the alloy composition in the molten steel is adjusted during the refining process. And deoxidize by adding alloys of corresponding elements in the order of Si, Mn, Al, Ti. While ensuring the composition of the alloy, add Fe at the end 2 o 3 powder, and CaSi alloy and / or rare earth ferrosilicon. The CaSi alloy contains 30% Ca, the balance is Si, and the particle size is 0.1-5mm. The rare earth ferrosilicon contains 30.6% RE, 47.4% Si, the balance is Fe, and the particle size is 0.1-5mm.
[0058] Then the billet is heated to 1250°C, the initial rolling temperature is 1000-1150°C, and the cumulative reduction rate is 50%; the finish rolling temperature is 700-850°C, and the cumulative reduction rate is 67%; The cooling rate of °C / s is water-cooled to a final cooling temperature of 300-550 °C.
[0059] The welding thermal simulatio...
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Abstract
Disclosed are thick steel plates for high heat input welding and a production method thereof. The method includes the steps: firstly, smelting, refining and continuous casting; adding deoxidizer in deoxidation of molten steel according to a sequence of Mn, Si, Al and Ti; finally adding Ca and / or RE deoxidizer, adding Fe2O3 powder to accurately control an initial oxygen level in Ca and / or RE deoxidation of the molten steel; secondly, rolling; and thirdly cooling, wherein molten steel comprises, in weight percentage, 0.05-0.09% of C, 0.10-0.30% of Si, 1.3-1.7% of Mn, 0.005-0.03% of Ti, 0.003-0.025% of Nb, 0.001-0.01% of S, not more than 0.05% of P, not more than 0.006% of N, 0.0005-0.001% of Al, 0.0005-0.004% of Ca, not more than 0.01% of RE, the balance of Fe, and unavoidable impurities. Fine scattered Ca and / or RE oxide and sulfide inclusions can be formed, ratios of (Ca+RE) / Al, Ti / Al and (Ca+RE) / Mn in the inclusions are reasonably controlled, growth of intra-granular ferrite in a welding heat affected zone is promoted, and the performance of high heat input welding of the thick steel plates can be improved greatly.
Description
technical field [0001] The invention belongs to the field of iron and steel metallurgy and iron and steel materials, and in particular relates to a large heat input welded thick steel plate and a manufacturing method thereof. Background technique [0002] For shipbuilding, construction, pressure vessels, oil and gas pipelines, and offshore platforms, improving the high heat input welding performance of thick steel plates can improve welding efficiency, shorten manufacturing hours, and reduce manufacturing costs. Therefore, the toughness of the welding heat-affected zone of thick steel plates can be improved. has become an increasingly urgent requirement. [0003] After high input energy welding, the structure of the steel in the welding heat-affected zone is destroyed, and the austenite grain grows obviously, forming a coarse-grained zone. The structures that cause embrittlement in the coarse-grained region are side lath ferrite, upper bainite formed during cooling, coarse ...
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