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A kind of micro-alloy steel thick plate and normalizing rolling method thereof

A technology of normalizing rolling and micro-alloy steel, which is applied in the field of steel production. It can solve the problems of high conventional process, cumbersome, uneven performance of normalized extra-thick steel plates, etc., achieve a wide process window, solve uneven performance, and improve product performance. The effect of stability

Active Publication Date: 2019-08-27
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The multi-phase strengthening design based on composite precipitation strengthening is adopted to solve the problems of uneven performance of normalized extra-thick steel plates, high cost and tediousness of conventional processes, etc.

Method used

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  • A kind of micro-alloy steel thick plate and normalizing rolling method thereof
  • A kind of micro-alloy steel thick plate and normalizing rolling method thereof
  • A kind of micro-alloy steel thick plate and normalizing rolling method thereof

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Embodiment Construction

[0035] The technical problems involved in the present invention are solved by the following technical solutions: a microalloy steel plate and its normalizing rolling method, the mass percentage of its chemical composition is: C: 0.13% to 0.25%; Si: 0.1% to 0.4%; Mn : 1.85%~2.5%; P≤0.015%; S≤0.005%; V: 0.03%~0.08%; Cr: 0.05%~0.2%; N: 0.013%~0.017%, and the balance is Fe and unavoidable impurities.

[0036] Using converter + (LF+RH or VD) melting, using Si or Si-Mn alloy for deoxidation; [O]≤0.0015%. Nitrogen is added by blowing nitrogen and adding nitrogen-containing alloys in the refining process.

[0037] The billet heating temperature after continuous casting is 1150-1280°C, the soaking time is 200-600min, one-stage rolling is adopted, the starting rolling temperature is controlled at 1100-1200°C, the average pass reduction is 30-80mm, and the final rolling temperature is controlled At 950-1150°C. After the steel plate is rolled, it needs to be cooled by air cooling or wat...

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Abstract

The invention discloses a microalloy steel thick plate and a normalizing and rolling method thereof. Chemical components of steel comprise, by weight, 0.13%-0.25% of C, 0.1%-0.4% of Si, 1.85%-2.5% ofMn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.03%-0.08% of V, 0.05%-0.2% of Cr, 0.013%-0.017% of N, and the balance Fe and inevitable impurities. The O content of the steel is less than or equal to 0.0015%. The thickness of the steel plate is greater than or equal to 50 mm. Blanks used for the steel plate comprise the die-casting blank, the continuous casting blank and the composite blank produced in a compound mode. The heating temperature is 1150-1280 DEG C. The soaking time is 200-600 min. One-stage rolling is adopted. The initial rolling temperature is 1100-1200 DEG C. The average pass reduction is 30-80 mm. The finish rolling temperature is 950-1150 DEG C. The cooling rate after rolling is 1-10 DEG C / s. The steel plate is cooled to 600-800 DEG C. The stacking slow cooling time is less than or equal to 48 h. The steel plate can also be subjected to normalizing treatment after slow cooling. The normalizing temperature is 890-950 DEG C.

Description

technical field [0001] The invention belongs to the field of iron and steel production, and in particular relates to a method for manufacturing extra-thick and high-strength steel plates with guaranteed normalizing performance. Background technique [0002] Normalized hot-rolled structural steel plates are widely used in large-scale construction machinery, construction, oil drilling platforms, UHV power transmission components, frame structures of vehicles, pressure vessels and other fields. Especially in some welded structures, some components must be made of structural steel with excellent performance in the normalizing state. Studies have shown that when producing steel plates with a thickness of more than 50 mm, due to the small compression ratio, it is difficult to fully utilize the advantages of the TMCP process, and there are often uneven structures such as "mixed crystals" in the thickness direction of the steel plate. It is necessary to further improve the internal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/18C22C33/04C21D8/02C21D1/28
Inventor 赵坦李广龙范刘群刘源李文斌方恩俊黄松
Owner ANGANG STEEL CO LTD
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