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A 600mpa high-strength hot-rolled structural steel and its manufacturing method

A high-strength, hot continuous rolling technology, applied in the field of low-alloy steel manufacturing, can solve the problems of adverse effects of alloy content on weldability, high cost of steel plates, low C content, etc., to achieve improved strength and toughness, good cold-formation performance, high The effect of low temperature toughness

Active Publication Date: 2015-09-23
BAOSHAN IRON & STEEL CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0004] Chinese patent CN101153371A discloses a 700MPa-level hot-rolled steel plate, which mainly improves the strength of the steel plate through the precipitation strengthening of Nb and Ti. The content of precious elements such as Nb and Mo in the steel is relatively high, and the cost of the steel plate is relatively high.
This patent has low C content and high content of elements such as Nb, Mn and Cr, resulting in a relatively high cost of the steel plate
[0006] Chinese patent CN101285156A discloses a Ti precipitation-strengthened bainitic steel. The content of alloy elements Cr and Mn in the steel is relatively high, the cost of the steel plate is relatively high, and the high alloy content will have certain disadvantages to its weldability influences

Method used

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  • A 600mpa high-strength hot-rolled structural steel and its manufacturing method
  • A 600mpa high-strength hot-rolled structural steel and its manufacturing method
  • A 600mpa high-strength hot-rolled structural steel and its manufacturing method

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.

[0045] The chemical composition of the steel plate embodiment of the present invention is shown in Table 1, and the balance is Fe and unavoidable impurities. Slabs are formed by deep desulfurization of molten iron, smelting in a 500kg vacuum induction furnace, refining outside the furnace, and continuous casting. Heat the slab to 1230-1280°C, keep it warm for more than 3 hours, finish rough rolling at 1000-1050°C, finish rolling at 820-920°C, water cool to the specified coiling temperature after rolling, and cool at a rate of 10-50°C / s, the coiling temperature is 400-550°C. See Table 2 for the process parameters of the manufacturing method of the embodiment of the present invention, and see Table 3 for the mechanical properties.

[0046] Table 1 Unit: weight percentage

[0047]

[0048] Table 2

[0049]

[0050]

[0051] table 3

[0052] ...

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Abstract

The invention discloses a kind of 600Mpa-grade high-strength hot continuous rolling structural steel and a manufacturing method thereof. The structural steel comprises the following chemical compositions in percentage by weight: 0.14-0.24% of C, less than or equal to 0.50% of Si, 0.5-1.5% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.04-0.15% of Ti, 0.0005-0.003% of B, less than or equal to 0.05% of Al, and the balance of Fe and unavoidable impurities. According to the composition design, through molten-iron deep desulphurization, external refining, slab preparation by continuous casting, slab reheating, controlled rolling, controlled cooling, and rolling, the structural steel disclosed by the invention is obtained, the yield strength is greater than or equal to 600 MPa, the tensile strength is greater than or equal to 650 MPa, the percentage of elongation is greater than or equal to 16%, and the impact energy at the temperature of 20 DEG C is greater than or equal to 100J, and the structural steel has a good cold-bent forming performance.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to a 600MPa high-strength hot-rolled structural steel and a manufacturing method thereof. Background technique [0002] The application of high-strength steel can significantly reduce the weight of the components and the self-weight of the equipment, thereby reducing the fuel consumption of the equipment and improving the working efficiency of the equipment. One or more methods such as fine-grain strengthening, precipitation strengthening, solid solution strengthening, and phase transformation strengthening can be used to improve the strength of structural steel. [0003] At present, there are two main categories of 600MPa high-strength structural steel. One is low-carbon or ultra-low-carbon bainite steel. By adding a certain amount of alloying elements Mo, Mn, Cr, Ni and B, etc., the steel plate forms a structure dominated by low-carbon bainite, so that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 胡晓萍温东辉杨阿娜杨晓臻王焕荣刘刚张志超
Owner BAOSHAN IRON & STEEL CO LTD
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