Production method of low-temperature steel plate capable of being welded by high heat input
A large heat input welding and production method technology, applied in the direction of improving process efficiency, etc., can solve the problems of deterioration of toughness, lack of research on the order and influence of alloy addition, and achieve the effect of improving welding performance
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[0021] Example 1:
[0022] The molten steel smelting process is as follows:
[0023] Hot metal pretreatment→180t combined blowing converter smelting→LF refining→RH refining→wire feeding→continuous casting. During the converter smelting process, the ratio of the amount of molten iron used for charging to the clean steel scrap is 7.5, the molten iron temperature is 1400℃, S≤0.003% by weight, the basicity of slag is 3.5, and the proportion of MgO is 9.0%; it is added sequentially when the steel is about 30 tons Ferromanganese, ferrosilicon, lime. The LF refining process produces white slag, and at the same time conducts oxygen determination of the molten steel, adds boron and iron, diffuses deoxidation, and takes a sample of molten steel for composition fine-tuning. During the RH vacuum treatment stage, measure the oxygen and control the oxygen content to 10-100ppm and then add ferro-titanium. After the net cycle, the molten steel temperature is 1570-1600℃ and the oxygen content is ...
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[0030] Example 2:
[0031] The molten steel smelting process is as follows:
[0032] Hot metal pretreatment→180t combined blowing converter smelting→LF refining→RH refining→wire feeding→continuous casting. During the converter smelting process, the ratio of the amount of molten iron used for charging to the clean scrap is 7, the temperature of molten iron is 1450℃, S≤0.003% by weight, the basicity of slag is 3.5, and the proportion of MgO is 9.0%; it is added sequentially when the steel is about 20 tons Ferromanganese, ferrosilicon, lime. In the LF refining process, white slag is produced, boron and iron are added, and at the same time, the molten steel is oxygenated, diffused and deoxidized, and the molten steel sample is taken for fine adjustment of the composition. The tapping temperature is controlled at 1620-1640°C. In the RH vacuum treatment stage, when the oxygen content of the molten steel meets the requirement of 10-100 ppm, ferro-titanium is added, and then the oxygen i...
Example Embodiment
[0039] Example 3:
[0040] The molten steel smelting process is as follows:
[0041] Hot metal pretreatment→180t combined blowing converter smelting→LF refining→RH refining→wire feeding→continuous casting. In the converter smelting process, the ratio of the amount of molten iron used for charging to clean scrap is 8, the temperature of molten iron is 1430℃, S≤0.003% by weight, and the basicity of slag is 3.5; when tapping about 35 tons, add ferromanganese and ferrosilicon in sequence ,lime. In the LF refining process, white slag is produced. At the same time, the molten steel is oxygen-fixed, boron and iron are added, and the composition is fine-tuned. The tapping temperature is controlled at 1620-1640°C. In the RH vacuum stage, when the oxygen content of the molten steel meets the requirement of 10-100 ppm, ferro-titanium is added, and then the oxygen is measured. After the oxygen content of the molten steel meets 20-80 ppm, the molten steel is broken and fed into the molten ste...
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