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High-tenacity steel and steel plate adaptive to high heat input welding and production method thereof

A manufacturing method and steel plate technology, which is applied in the direction of manufacturing tools, metal rolling, temperature control, etc., can solve the problems of unfavorable welding performance of the steel plate core, increase the difficulty of smelting, etc., achieve reasonable composition and process design, loose process system, and simplify The effect of the manufacturing process

Active Publication Date: 2010-06-09
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too high Mn is unfavorable to the welding performance of the steel plate core
In addition, the steel improves the form of oxygen and sulfur compounds by adding REM and Mg, and at the same time uses electromagnetic stirring to improve the toughness of the steel plate core and adapt to large heat input welding, which increases the difficulty of smelting to a certain extent.

Method used

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  • High-tenacity steel and steel plate adaptive to high heat input welding and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Smelt in an electric furnace or converter according to the chemical composition shown in Table 1, and cast into a continuous casting billet. The continuous casting billet is heated to 1150℃, and the first stage rolling is carried out on the medium and thick rolling mills. The opening temperature is 1070℃. When the thickness of the rolled piece is 50mm, it is heated to 850℃ on the roller table, and then the second stage rolling is carried out. The deformation rate of the second stage rolling pass is 15-25%, the final rolling temperature is 820℃, and the thickness of the finished steel plate is 20mm. After rolling, the steel plate enters the accelerated cooling (ACC) device, and is cooled to 520°C at a rate of 25°C / S. After water cooling, it is stacked or cooled by a cooling bed.

Embodiment 2

[0039] The embodiment is the same as in Example 1, in which the heating temperature is 1100°C; the opening temperature of the first stage rolling is 1050°C, and the thickness of the rolled piece is 68mm; the opening temperature of the second stage rolling is 840°C, and the pass deformation rate It is 12-22%, the final rolling temperature is 810℃, the thickness of the finished steel plate is 26mm; the cooling rate of steel plate is 20℃ / S, and the final temperature is 540℃.

Embodiment 3

[0041] The embodiment is the same as in Example 1, in which the heating temperature is 1130°C; the opening temperature of the first stage rolling is 1090°C, and the thickness of the rolled piece is 85mm; the opening temperature of the second stage rolling is 840°C, and the pass deformation rate It is 10-15%, the final rolling temperature is 790℃, the thickness of the finished steel plate is 31mm; the cooling rate of steel plate is 18℃ / S, and the final temperature is 570℃.

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Abstract

The invention provides a high-tenacity steel and a steel plate adaptive to high heat input welding and a production method thereof. The high-tenacity steel and steel plate comprise the following compositions by weight percent: 0.045-0.075% of C, 0.20-0.40% of Si, 1.20-1.60% of Mn, 0.015-0.025% of Nb, 0.02-0.06% of Al, 0.006-0.020% of Ti, 0.020-0.060% of N, P is no more than 0.015%, S is no more than 0.003% and the balance Fe and inevitable impurities. The invention also provides a production method for the steel plate, including smelting, continuous casting, heating, rolling and cooling. The invention adopts low C-moderate Mn-low Si-micro Nb and Ti-no B series of steel grade, and improves the strength, low-temperature tenacity and weldability of the steel plate by strengthening the control of thermo-mechanical rolling and post-rolling accelerated cooling technology.

Description

Technical field [0001] The present invention relates to the field of iron and steel materials. Specifically, the present invention relates to a steel with high toughness and suitable for welding with large heat input. Background technique [0002] Low-alloy high-strength steel plates are widely used in shipbuilding, bridges and other construction industries, and the large heat input welding process can improve the user's production efficiency and reduce labor costs. In order to adapt the steel plate to the requirements of high heat input welding and to meet the strength and low temperature toughness of the steel plate, steel mills usually reduce the carbon content in the steel and add microalloying elements such as Nb, V, and Ti when producing the above products. In order to improve the low temperature toughness of the steel plate, it is necessary to add precious elements such as Ni, Mo, and Cu to the steel, which increases the cost. Therefore, it is necessary to reduce the amou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14B21B37/74B21B37/16C21D8/02
Inventor 贺达伦胡聆朱岩吴扣根张向葵胡执虎
Owner BAOSHAN IRON & STEEL CO LTD
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