Titanium-reinforced low-cost Q390 grade hot rolled plate and production method thereof

A production method and technology for hot-rolled coils, applied in the metallurgical field, can solve the problems of poor coating, high alloy consumption and high alloy content, and achieve the effects of reduced alloy cost, good welding performance and low alloy content

Inactive Publication Date: 2019-05-03
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing Q390 high-strength structural steel adopts carbon-manganese alloying, and the manganese element is usually more than 1.3%. The alloy consumption is high, resulting in waste of resources, and the carbon equivalent is ≥0.40. Preheating and postheating are required during the welding process to avoid welding Defects that increase welding difficulty and energy consumption
Moreover, structural

Method used

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  • Titanium-reinforced low-cost Q390 grade hot rolled plate and production method thereof
  • Titanium-reinforced low-cost Q390 grade hot rolled plate and production method thereof
  • Titanium-reinforced low-cost Q390 grade hot rolled plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] The thickness of the finished titanium reinforced low-cost Q390 grade hot-rolled coil in this embodiment is 3mm, and its chemical composition and mass percentage are: C: 0.15%, Si: 0.08%, Mn: 0.45%, P: 0.008%, S : 0.005%, Als: 0.026%, Ti: 0.050%, N: 0.0035%, the balance is Fe and unavoidable impurities; Ceq: 0.23.

[0029] The production method of titanium-strengthened low-cost Q390 grade hot-rolled coil in this embodiment includes smelting, refining, continuous casting, slab heating, controlled rolling, controlled cooling, and coiling processes. The specific process steps are as follows:

[0030] (1) Smelting process: The blowing process ensures early slag formation in the early stage of smelting, and the initial slag formation time is 4 minutes. The use of low temperature dephosphorization requires a steady rise in furnace temperature; post-stirring is required before tapping, and the post-stirring time is 101s to ensure molten steel in the furnace Unifor...

Example Embodiment

[0038] Example 2

[0039] The thickness of the finished product of titanium reinforced low-cost Q390 grade hot-rolled coil in this embodiment is 5mm, and its chemical composition and mass percentage are: C: 0.16%, Si: 0.05%, Mn: 0.47%, P: 0.009%, S : 0.003%, Als: 0.036%, Ti: 0.048%, N: 0.0038%, the balance is Fe and unavoidable impurities; Ceq: 0.24.

[0040] The production method of titanium-strengthened low-cost Q390 grade hot-rolled coil in this embodiment includes smelting, refining, continuous casting, slab heating, controlled rolling, controlled cooling, and coiling processes. The specific process steps are as follows:

[0041] (1) Smelting process: The blowing process ensures early slag formation in the early stage of smelting, and the initial slag formation time is 4.2min. The use of low temperature dephosphorization requires a stable rise in furnace temperature; post-stirring is required before tapping, and the post-stirring time is 102s to ensure the furnace interior The m...

Example Embodiment

[0049] Example 3

[0050] The thickness of the finished product of titanium reinforced low-cost Q390 grade hot-rolled coil in this embodiment is 12mm, and its chemical composition and mass percentage are: C: 0.17%, Si: 0.08%, Mn: 0.50%, P: 0.008%, S : 0.003%, Als: 0.018%, Ti: 0.052%, N: 0.0041%, the balance is Fe and unavoidable impurities; Ceq: 0.25.

[0051] The production method of titanium-strengthened low-cost Q390 grade hot-rolled coil in this embodiment includes smelting, refining, continuous casting, slab heating, controlled rolling, controlled cooling, and coiling processes. The specific process steps are as follows:

[0052] (1) Smelting process: The blowing process ensures early slag formation in the early stage of smelting, and the initial slag formation time is 4.3min. The use of low temperature dephosphorization requires a stable rise in furnace temperature; post-stirring is required before tapping and the post-stirring time is 105s to ensure the furnace The molten ste...

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Abstract

The invention discloses a titanium-reinforced low-cost Q390 grade hot rolled plate and a production method thereof. The chemical component percentages of the hot rolled plate are, by mass, 0.15%-0.18%of C, less than or equal to 0.10% of Si, 0.45%-0.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.06% of S, 0.015%-0.060% of Als, 0.040%-0.055% of Ti, less than or equal to 0.0050% of N, and the balance Fe and inevitable impurities; and the method includes steps of smelting, refining, continuous casting, heating a plate blank, controlling rolling, controlling cooling and rolling. By adopting a low-manganese and titanium micro-alloy strengthening design, the hot rolled plate has a yield strength greater than or equal to 390 MPa, a strength of extension greater than or equal to 490 MPa, an elongation greater than or equal to 20%, and a Ceq from 0.23 to 0.28, so that the hot rolled plate and the production method thereof have the advantages such as good welding performance, low content of alloy, good effect of galvanization and low cost.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a titanium-enhanced low-cost Q390 grade hot-rolled coil and a production method thereof. Background technique [0002] With the pressure of resources and environmental protection, it is imperative to reduce resource consumption and improve the performance of materials to achieve green production of steel. [0003] The existing Q390 grade high-strength structural steel adopts carbon-manganese alloying. The manganese element is usually more than 1.3%. The alloy consumption is high, resulting in waste of resources, and the carbon equivalent is ≥0.40. Preheating and postheating are required during the welding process to avoid welding. Defects increase welding difficulty and energy consumption. Moreover, structural steel is now mostly used for anti-corrosion and decoration such as galvanized, galvanized, etc. However, due to the high alloying elements of traditional ca...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C21C7/00C21C7/06C21C7/064C21D8/02C22C33/04
Inventor 陆凤慧白宗奇邢俊芳田鹏温春普崔永新
Owner HEBEI IRON AND STEEL
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