Manufacturing method of steel plate SM490B for welding structure

Abstract

The invention provides a manufacturing method of a steel plate SM490B for a welding structure. The steel plate SM490B for the welding structure comprises the following chemical components of, in percentage by weight, 0.05-0.09 wt% of C, Si less than or equal to 0.47 wt%, 0.80-1.40 wt% of Mn, P less than or equal to 0.030 wt%, S less than or equal to 0.015 wt%, 0.020-0.040 wt% of Alt, N less than or equal to 0.006 wt%, Nb + Ti less than or equal to 0.10 wt% and the balance Fe and inevitable trace elements. The process route of the manufacturing method sequentially comprises the steps of blast furnace molten iron smelting, molten iron desulfurization pretreatment, converter molten steel smelting, LF molten steel refining treatment, RH molten steel refining treatment, slab continuous casting, hot slab heating, descaling, rough rolling, finish rolling and straightening. The steel plate SM490B for the welding structure reaches the performance level of SM490C, and the cost is low.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for manufacturing a steel plate for a welded structure, in particular to a method for manufacturing a steel plate SM490B for a welded structure or a method for manufacturing a steel plate for an SM490B welded structure. Background technique [0002] Steel plate SM490B for welded structures is suitable for structural parts requiring excellent welding performance, such as buildings, bridges, ships, vehicles, and engineering machinery. [0003] Two grades SM490B and SM490C in Japanese Industrial Standard JIS G 3106, the tensile test thickness > 16-40mm adopts No. 1A sample, the upper yield strength is required to be ≥ 315MPa, the tensile strength range is 490 ~ 610MPa, and the elongation rate adopts fixed length gauge A 200 , requires ≥21%, and the elongation index is difficult to control. The impact energy of the two grades corresponding to 0°C low temperature is required to...

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Problems solved by technology

[0005] The present invention provides a manufacturing method of steel plate SM490B for welded structure, to solve the problem that the performance index of the existing steel plate SM490B for welded structure (steel plate for SM490B welded structure) is not high, the actual punching resistance of the product is not enough during use, and the safety is poor The problem

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