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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, 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: 2012-03-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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] According to the chemical composition shown in Table 1, it is smelted in an electric furnace or a converter, and cast into a continuous casting slab. The continuous casting slab is heated to 1150 ° C, and the first-stage rolling is carried out on a medium and thick rolling mill. The rolling temperature is 1070 ° C. When When the thickness of the rolled piece is 50mm, wait for the temperature on the roller table to 850°C, and then carry out the second stage rolling. The deformation rate of the second stage rolling pass is 15-25%, the final rolling temperature is 820°C, 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 in a cooling bed.

Embodiment 2

[0039] The implementation method is the same as in Example 1, wherein the heating temperature is 1100°C; the rolling start temperature of the first stage rolling is 1050°C, and the thickness of the rolled piece is 68mm; the starting rolling temperature of the second stage rolling is 840°C, and the pass deformation rate The final rolling temperature is 810°C, the thickness of the finished steel plate is 26mm; the cooling rate of the steel plate is 20°C / S, and the termination temperature is 540°C.

Embodiment 3

[0041] The implementation is the same as in Example 1, wherein the heating temperature is 1130°C; the rolling start temperature of the first stage rolling is 1090°C, and the thickness of the rolled piece is 85mm; the starting rolling temperature of the second stage rolling is 840°C, and the pass deformation rate The final rolling temperature is 790°C, the thickness of the finished steel plate is 31mm; the cooling rate of the steel plate is 18°C / S, and the termination temperature is 570°C.

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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 invention relates to the field of iron and steel materials, in particular, the invention relates to a steel with high toughness and adaptable to large heat input welding. Background technique [0002] Low-alloy high-strength steel plates are widely used in construction industries such as shipbuilding and bridges, and the high-energy-input welding process can improve users' production efficiency and reduce labor costs. In order to make the steel plate adapt to the requirements of high heat input welding and meet the strength and low temperature toughness of the steel plate, the steel mill usually reduces the carbon content in the steel and adds 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 Ni, Mo, Cu and other precious elements into the steel, which increases the cost. Therefore, it is necessary to reduce the amount of allo...

Claims

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Application Information

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Patent Type & Authority Patents(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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