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High-strength hot-rolled profile and temperature control and cooling process thereof

A high-strength, profile technology, used in temperature control, metal rolling, etc., can solve the problems of difficulty in meeting strength requirements and high cost, and achieve the effect of increasing ultimate strength, increasing strength yield ratio, and improving comprehensive performance.

Inactive Publication Date: 2020-08-25
江苏联峰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the existing technology, the microalloying route is adopted, and it is difficult to meet the strength requirements by relying on a single production process, and there is a technical problem of high cost

Method used

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  • High-strength hot-rolled profile and temperature control and cooling process thereof
  • High-strength hot-rolled profile and temperature control and cooling process thereof
  • High-strength hot-rolled profile and temperature control and cooling process thereof

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Embodiment

[0047] Table 1 is a comparative table of chemical composition between the high-strength hot-rolled profiles of the present invention and existing profiles. Table 2 is a comparison of the mechanical properties of the sample block of the high-strength hot-rolled profile described in the present invention and the existing profile. In Table 2, Rm is the tensile strength, Rel is the lower yield strength, A is the elongation after fracture, and Agt is the elongation.

[0048] Table 1

[0049]

[0050] Table 2

[0051]

[0052] It can be seen from Table 1 and Table 2 that by controlling V / N at 3.49, 3.56, 3.83, and controlling the niobium content at 0.015% and 0.025%, the smelted billet is rolled to obtain the corresponding mechanical properties. After comparison, V The performance is the most stable when / N is 3.56, and the utilization effect of V and Nb is the best. Compared with existing materials, the yield strength has been significantly improved, and the seismic perfor...

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Abstract

The present invention provides a high-strength hot-rolled profile. The high-strength hot-rolled profile comprises the following chemical compositions of: 0.14-0.25% of C, 1.40-1.80% of Mn, 0. 40-0.60%of Si, 0.075-0.095% of V, less than or equal to 0.045% of P / S, 0.0215-0.025% of N, 0.015-0.020% of Nb, and the balance Fe and inevitable impurities. The V / N ratio of the chemical composition of the hot-rolled profile is 3.49-3.83. The hot-rolled profile also comprises chemical components B and Cr, the chemical composition of B being 0.0015-0.005%, and the chemical composition of Cr is 0.6-0.7%. According to the invention, the chemical compositions and rolling processes are adjusted on the basis of a common profile, and the comprehensive performance of the profile is improved.

Description

technical field [0001] The invention relates to the technical field of profile manufacturing technology, in particular to a high-strength hot-rolled profile and its temperature and cooling process. Background technique [0002] At present, the low-strength profiles on the market are saturated, and there will be no improvement in the short term, while the high-strength profiles of 500MPa and above are the current domestic high-grade profiles, which are widely used in various building structures, especially large, heavy, Lightweight construction. Compared with low-strength profiles, the use of high-strength profiles with a strength of 500 MPa and above can save more than 30% of steel consumption. Its development and application will also promote the promotion and application of high-performance energy-saving and environmentally friendly new materials, greatly improve the current structure of building products, and provide strong support for the realization of resource-saving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/04B21B1/08B21B37/74
CPCB21B1/08B21B37/74C22C33/04C22C38/001C22C38/02C22C38/04C22C38/12
Inventor 黄飞张勇薛伟江
Owner 江苏联峰实业有限公司
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