Ferritic stainless steel with excellent low temperature toughness of welded joints
A technology of welded joints and low temperature toughness, applied in welding equipment, welding medium, welding/cutting medium/material, etc., to achieve the effect of improving formability
Active Publication Date: 2019-07-02
浦项股份有限公司
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Problems solved by technology
Therefore, in terms of said patent document, it is not a preferred method for solidification structure refinement of welded joints
Method used
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Embodiment 1 to 12
[0087] The stainless steel of the base metal component system of Examples 1 to 12 in Table 1 below is produced by electric furnace (EAF)-refining furnace (AOD)-composition adjustment (LT)-tundish (Tundish)-continuous casting process Thereafter, a steel plate having a thickness of 1.2 mm was produced through hot rolling and cold rolling.
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Abstract
The invention discloses a welded joint ferritic stainless steel with good low-temperature toughness. According to the embodiment of the invention, the ferritic stainless steel comprises 9% to 30% by weight of Cr, less than 0.015% by weight of N, 0.005% to 0.04% by weight of Al, 0.1% to 0.5% by weight of Ti, remain of Fe and other unavoidable impurities, a formula (1) is satisfied, and the ferriticstainless steel also comprises Al-Ca-Ti-Mg-O oxides with 0.05[mu]m to 5[mu]m of maximum diameters and more than 9 / mm2 of distribution density. Then the size and distribution density of the Al-Ca-Ti-Mg-O oxides in base metal of stainless steel can be controlled, welded joint solidification structure can be fully refined, so that moldability of the ferritic stainless steel and low-temperature toughness of the welded joint can be improved, Ti>(0.0065Cr+0.38N+8.3Al)----formula (1)
Description
technical field [0001] The present invention relates to a ferritic stainless steel, and more particularly, to a ferritic stainless steel with excellent low-temperature toughness of welded joints. Background technique [0002] Ferritic stainless steel is mainly used for automobile exhaust system parts, and the processed products are mainly formed and welded by stamping, or the final product is produced by expanding and forming welded pipes. Therefore, an important requirement of the ferritic stainless steel for automobile exhaust systems is, for example, the workability of welded joints. [0003] Generally, the welding process of ferritic stainless steel is to use arc heat to melt the base metal. At this time, the molten metal is rapidly cooled to form a solidified structure. The grain size and shape of the solidified structure have a great influence on the workability of the welded joint. [0004] In particular, due to the large heat input and wide range of the welding meth...
Claims
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IPC IPC(8): C22C38/28C22C38/06C22C38/02C22C38/04C22C38/22C22C38/20C22C38/50C22C38/42C22C38/44
CPCB23K35/3086C21D2211/005C22C38/001C22C38/06C22C38/28
Inventor 金钟哲郑壹鄼金善求李元培
Owner 浦项股份有限公司
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