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Low-cost Q390 medium and thick plate and production method thereof

A production method and low-cost technology, applied in the field of iron and steel production, can solve problems such as steel consumption, achieve the effects of improving the pass rate, reducing resource consumption, and reducing costs

Inactive Publication Date: 2017-09-05
TANGSHAN IRON & STEEL GROUP +1
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  • Application Information

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Problems solved by technology

At present, low-alloy series steel is still used as the main construction steel in China, but according to the data of China Steel Structure Association, the proportion of Q345 steel in the construction structure has dropped to less than 60%, and the consumption of Q390 steel has been increased to a certain extent. , and with the construction of large-scale public buildings and water conservancy and wind power projects, the overall consumption of steel in the steel industry will be driven

Method used

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  • Low-cost Q390 medium and thick plate and production method thereof
  • Low-cost Q390 medium and thick plate and production method thereof
  • Low-cost Q390 medium and thick plate and production method thereof

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Embodiment Construction

[0015] The inspection standard of the low-cost Q390 medium-thick plate of the present invention is GB / T 1591-2008 "Low Alloy High-Strength Structural Steel", and the performance requirements of the steel plate with a thickness of 50 mm or less are shown in Table 1.

[0016] Table 1: National standard requirements for performance of steel plates with a thickness of 50 mm or less

[0017]

[0018] The present invention will be described in further detail below in conjunction with specific examples.

[0019] Embodiment 1-6: Low-cost Q390 medium-thick plate and its production method adopt the following specific process.

[0020] (1) The low-cost Q390 medium-thick plate is prepared through smelting, continuous casting, heating, rolling and cooling processes; the heating process, the heating temperature is 1200-1260 °C; the rolling process, the finishing rolling start temperature is ≤950 °C , the final rolling temperature is 770-800 ° C; the cooling process is cooled by ultra-fa...

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Abstract

A low-cost Q390 medium-thick plate and a production method thereof belong to the technical field of iron and steel production. The chemical composition and weight percentage of the plate are: C: 0.14-0.19%, Mn: 1.30-1.50%, Si: 0.15-0.25% , S≤0.01%, P≤0.018%, Als: 0.02‑0.04%, the balance is Fe and inevitable impurity elements; the production method includes smelting, continuous casting, heating, rolling and cooling processes. The invention adopts the design of C-Mn composition system, does not add Nb and Ti microalloying elements, reduces the consumption of alloy and reduces the production cost; adopts ultra-fast cooling equipment for cooling, and relies on strong cooling capacity and cooling path to ensure the mechanical properties of the steel plate It can ensure that the reddening temperature of the upper and lower surfaces is stable between 620-660 °C, improve the performance qualification rate of the steel plate, and further reduce the production cost.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a low-cost Q390 medium-thick plate and a production method thereof. Background technique [0002] In recent years, the application of steel products in the construction industry has been significantly promoted, especially with the popularization of people-oriented and scientific development concepts, people's requirements for building performance have also gradually increased. At present, low-alloy series steel is still used as the main construction steel in China, but according to the data of China Steel Structure Association, the proportion of Q345 steel in the construction structure has dropped to less than 60%, and the consumption of Q390 steel has been increased to a certain extent. , and with the construction of large-scale public buildings and water conservancy and wind power projects, the overall consumption of steel in the steel industry wil...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02
CPCC22C38/04C21D8/0226C22C38/02C22C38/06
Inventor 李可斌尹绍江陈菲臧淼郝鑫刘伟建安海玉郑治秀王云阁
Owner TANGSHAN IRON & STEEL GROUP
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