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Thick steel plate capable of being welded under large heat input and method for manufacturing the same

A technology of high heat input welding and manufacturing method, which is applied in the field of thick steel plates that can be welded with large heat input and in the field of manufacturing, and can solve the problems of HAZ low temperature toughness deterioration and low temperature toughness difficult to achieve

Active Publication Date: 2006-07-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Firth (1986) international Synposium and Exhibit on Offshore Mechanics and Arctic Engineering, 1986, Tokyo, Japan, 354; "DEVELOPMENTS IN MATERIALS FOR ARCTIC OFFSHORE STRUCTURES" (Sumitomo Metal 2)], to ensure the low temperature toughness of the base steel plate; but the welding heat The low-temperature toughness of the affected zone (HAZ) is generally difficult to achieve, especially when the welding line energy is large, the low-temperature toughness of the HAZ is seriously deteriorated; a large number of patent documents only explain how to realize the low-temperature toughness of the base steel plate, and how to obtain excellent welding HAZ low-temperature The toughness is less explained, especially how to ensure the low-temperature toughness of HAZ when high-energy-input welding is used, and in order to ensure the low-temperature toughness of the steel plate, a certain amount of Ni element is generally added to the steel. Zone (HAZ) low temperature toughness is rarely able to reach -60 ℃

Method used

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  • Thick steel plate capable of being welded under large heat input and method for manufacturing the same

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Embodiment Construction

[0052] The composition of the example is shown in Table 1, the manufacturing process is shown in Table 2, and Table 3 shows the performance comparison of the steel plates of the present invention and comparative examples.

[0053] steel sample

[0054]

[0055] steel sample

[0056] According to the present invention, the alloying of precious elements such as Ni, Cr, Mo, Cu, etc., especially the alloying of Ni element is removed from the newly invented steel plate, and the TMCP process is optimized, while obtaining uniform and excellent low-temperature toughness of the base steel plate, The low temperature toughness of HAZ is also excellent during high heat input welding. This can not only reduce the manufacturing cost, shorten the production cycle, but also reduce the difficulty of production organization [steel plates with high content of Ni, Cu, and Mo elements have poor surface quality of continuous casting slabs, and generally need to go off-l...

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Abstract

The invention provides a thick steel plate for large-thread energy welding, wherein the constituents comprise (by weight percentage) C 0.010-0.020%, Si 0.10-0.30%, Mn 1.80-2.30%, P<=0.010%, S<=0.003%, Nb 0.015-0.030%, Al 0.025-0.050%, Ti 0.010-0.020%, N 0.003-0.006%, REM 0.001-0.005ppm, Mg 0.002-0.006%, B 10-35ppm, and balancing Fe.

Description

technical field [0001] The present invention relates to an extremely low-carbon TMCP thick steel plate which can be welded with large input energy in an extremely low-C-high-Mn-Nb-B alloy system to obtain yield strength ≥ 420MPa, Charpy impact toughness ≥ 100J at -60°C Manufacturing method. Background technique [0002] As we all know, low-carbon (high-strength) low-alloy steel is one of the most important engineering structural materials, widely used in oil and gas pipelines, offshore platforms, shipbuilding, bridges, pressure vessels, building structures, automobile industry, railway transportation and machinery manufacturing . The properties of low-carbon (high-strength) low-alloy steel depend on its chemical composition and the process system of the manufacturing process, among which strength, toughness and weldability are the most important properties of low-carbon (high-strength) low-alloy steel, which are ultimately determined by the finished steel state of the micr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 刘自成
Owner BAOSHAN IRON & STEEL CO LTD
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