Method for improving high heat input welding performance of thick steel plates

A large energy input welding and thick steel plate technology, applied in the field of iron and steel metallurgy and iron and steel materials, can solve the problem of insufficient improvement of the toughness of the welding heat affected zone, so as to improve the welding performance of large input energy, promote growth, and inhibit the growth of grains big effect

Active Publication Date: 2011-09-21
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology

However, in the process of large input energy welding with welding input energy greater than 200kJ / cm, titanium oxide alone is still not enough to improve the toughness of the welding heat-affected zone

Method used

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  • Method for improving high heat input welding performance of thick steel plates
  • Method for improving high heat input welding performance of thick steel plates

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with embodiment.

[0047] In this embodiment, the smelting process is carried out in a 50kg vacuum induction furnace. The furnace lining is made of magnesia with 1.2% boric acid dry-mixed and then sintered, and cast with high-alumina refractory material ingot mold. Add 40kg of pure iron to the induction furnace and add CaO at the same time. The method of simply adding CaO to make slag ensures a lower oxygen position in the slag. While vacuuming, the temperature rises, and the vacuum degree can reach 30Pa after the charge is melted. After filling the induction furnace with Ar gas to 0.05MPa, adjust the alloy composition in the molten steel. And deoxidize by adding alloys of corresponding elements in the order of Si, Mn, Al, Ti, Ca. Sampling and online analysis of alloy composition, while ensuring the alloy composition, finally add NiMg alloy and Fe at the bottom of the casting ingot mold 2 o 3 Pow...

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Abstract

The invention discloses a method for improving the high heat input welding performance of thick steel plates. The method comprises the following steps of: 1) smelting and casting to obtain an ingot, wherein deoxidants are added in the deoxidation process of molten steel, the adding sequence of the deoxidants is Mn and Si, Al, Ti, and Ca, a Mg deoxidant is added in the casting process of the molten steel, and the initial oxygen potential during the deoxidation of Mg is accurately controlled by adding Fe2O3 powder into a casting ingot mould; and 2) rolling and cooling. In the method, microfine dispersive distribution and Mg-containing inclusions, which are formed by adding the deoxidants in the deoxidation process of the molten steel and adding the Fe2O3 powder into the casting ingot mould to accurately control the oxygen potential during the deoxidation of the Mg, can inhibit the growth of austenite grains in a welding heat affected zone, and promotes the growth of ferrite in the grains, so that the high heat input welding performance of the thick steel plates is greatly improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and iron and steel materials, and in particular relates to a method for improving the large heat input welding performance of thick steel plates. Background technique [0002] For shipbuilding, construction and other fields, improving the high-energy-input welding performance of thick steel plates can improve welding efficiency, shorten manufacturing hours, and reduce manufacturing costs. For pressure vessels, oil and gas pipelines, and offshore platforms, improving the toughness of the welded heat-affected zone of thick steel plates has become an increasingly urgent requirement. [0003] After high input energy welding, the structure of the steel is destroyed, and the austenite grains grow obviously, forming a coarse-grained heat-affected zone, which reduces the toughness of the welded heat-affected zone. The structures that cause embrittlement in the coarse-grained heat-affected zone ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 杨健祝凯王睿之沈建国
Owner BAOSHAN IRON & STEEL CO LTD
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