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Low-cost manufacturing method of flaw-detection-ensured Q345B stage steel plate

A manufacturing method and low-cost technology, applied in the field of low-cost manufacturing of Q345B grade steel plates for flaw detection, can solve the problems of large addition of manganese alloy, long production process and high production cost, and achieve lower alloy costs, lower costs per ton of steel, The effect of increasing machine-time output

Active Publication Date: 2018-10-16
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to solve the current problems of long production process and relatively high production cost caused by the large amount of manganese alloy added to ensure the performance and flaw detection pass rate of Q345B grade steel plate, and provide a low-cost manufacturing method for flaw detection Q345B grade steel plate method

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  • Low-cost manufacturing method of flaw-detection-ensured Q345B stage steel plate

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Embodiment 130

[0045] A low-cost manufacturing method for flaw detection Q345B grade steel plate in this embodiment, the chemical composition and mass percentage content of the Q345B grade steel plate are: C 0.16%, Si 0.35%, Mn 0.75%, P 0.025%, S 0.012 %, Als 0.020, Ti0.025%, the rest is Fe and unavoidable impurities. The present embodiment takes 130 tons of converters as an example, and its manufacturing method comprises the following steps:

[0046] (1) Hot metal KR desulfurization treatment

[0047] Add molten iron with mass fraction P≤0.150%, S≤0.050% and temperature T≥1280°C in the molten iron tank, and then pretreat the molten iron with KR heavy desulfurization. After treatment, S≤0.005% in molten iron, and add Remove at least 2 / 3 of the desulfurization slag from the molten iron tank before the converter;

[0048] (2) Converter smelting

[0049] ①Smelting the desulfurized molten iron into the top-bottom combined blowing converter, adding dephosphorization agent to reduce the phospho...

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Abstract

The invention discloses a low-cost manufacturing method of a flaw-detection-ensured Q345B stage steel plate. The steel plate comprises, by mass percent, 0.15 to 0.20% of C, 0.15 to 0.50% of Si, 0.50 to 0.90% of Mn, not larger than 0.035% of P, not larger than 0.025% of S, 0.020 to 0.060% of Ti, 0.015 to 0.035% of Als, and the balance Fe and inevitable impurities. During preparing, molten iron is subject to KR desulfurization treatment firstly, the molten iron obtained after desulfurization treatment is subject to slag removal, the molten iron is converted into a converter to be smelted, outputmolten steel is subject to continuous casting and rolling, finally, the rolled steel plate is subject to stacking for slow-cooling for 24 to 72 hours, and then sampling inspection is carried out; thechemical components and the production process of the prepared Q345B stage steel plate are simple, the production cost is low, the flaw detection property is good, and the method has the good application and popularization prospects.

Description

technical field [0001] The invention relates to the technical field of alloy structural steel manufacturing, in particular to a low-cost manufacturing method for flaw detection Q345B grade steel plates. Background technique [0002] Q345 is a low-carbon alloy steel (C<0.2%), with good overall performance, low temperature performance, cold stamping performance, welding performance and machinability, and is widely used in bridges, vehicles, ships, buildings, pressure vessels, etc. [0003] In order to ensure the performance and pass rate of flaw detection of Q345B grade steel plate, the current practice in domestic iron and steel enterprises is to control the performance through the five elements of C, Si, Mn, P and S, and use BOF-LF-CC or BOF-LF-RH-CC And other production processes to improve the cleanliness of molten steel, so as to ensure the qualified rate of steel plate flaw detection, these processes ensure the quality of the steel plate, but the amount of manganese a...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/06C22C33/04C21C5/28C21C7/072C21C7/06C21D8/02
CPCC21C5/28C21C7/06C21C7/072C21D8/0226C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 夏金魁李相付廖广府杨波
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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