A low-cost manufacturing method for flaw detection q345b grade steel plate

A manufacturing method and low-cost technology, applied in the field of low-cost manufacturing of Q345B-grade steel plates for protection and inspection, can solve the problems of large addition amount of manganese alloy, high production cost, long production process, etc., so as to reduce the cost of alloy and the cost per ton of steel. , Improve the effect of machine-time output
CN108660381BActive Publication Date: 2019-11-05WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
Publication Date
2019-11-05

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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.
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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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