Ferritic stainless steel having high resistance to intergranular corrosion

A ferritic and corrosive technology, which is applied in the field of ferritic stainless steel with excellent intergranular corrosion resistance, can solve the problems of increasing the preparation cost of welding structures and complicated welding procedures, so as to inhibit intergranular corrosion and prevent intergranular corrosion. Inter-corrosion, preventing the effect of generation

Inactive Publication Date: 2016-09-07
POHANG IRON & STEEL CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires additional heat treatment after welding, so the welding process is complicated, and it not only increases the preparation cost of the welded structure, but also cannot be applied in the case of large structures. heat treated part

Method used

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  • Ferritic stainless steel having high resistance to intergranular corrosion
  • Ferritic stainless steel having high resistance to intergranular corrosion
  • Ferritic stainless steel having high resistance to intergranular corrosion

Examples

Experimental program
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Effect test

Embodiment

[0068] The compositions of Comparative Examples and Inventive Examples of the present invention are shown in Table 1 below.

[0069] Ferritic stainless steel material having the component contents in Table 1 below and containing P and S as impurities of 0.001% by weight or less was subjected to solution annealing at 1300°C for 10 minutes, and then sensitized at 500°C. heat treatment for 2 hours. This heat treatment is performed to simulate the driving environment of conventional steel after welding.

[0070] When welding ferritic stainless steel, it will be heated to near the melting temperature of stainless steel (above about 1300°C). The stainless steel materials of Ti and Nb, which are carbide stabilizing elements, are sensitized to induce intergranular corrosion.

[0071] Table 1

[0072]

[0073] (‘-’: present as a trace element)

[0074] After the ferritic stainless steel materials having the above-mentioned component contents of the comparative examples and the i...

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Abstract

The invention provides a ferritic stainless steel. The invention improves intergranular corrosion resistance of ferritic stainless steel by preventing the formation of a Cr carbide without using a carbide stabilization element such as Ti or Nb with a carbon affinity higher than Cr used for preventing intergranular corrosion in the past. The present invention provides the ferritic stainless steel with excellent intergranular corrosion resistance capable of fixating carbon inside a steel material by forming a grain and a Mo-Si-Mn-C based compound around the grain by adding Mo, Si, and Mn with a carbon affinity lower than Cr together and preventing intergranular corrosion by preventing the concentration of Cr generated in the grain and exhaustion caused by the same.

Description

technical field [0001] The invention relates to a ferritic stainless steel, which can be used in automobile exhaust components, thermal power generation equipment components, atomic energy power generation equipment components and fuel cell components exposed to high temperature for a long time. More specifically, it relates to a ferritic stainless steel excellent in intergranular corrosion resistance capable of preventing intergranular corrosion of ferritic stainless steel exposed to high temperature for a long time. Background technique [0002] Intergranular corrosion of stainless steel is the main cause of shortening the service life of structures, so long-term studies have been conducted to prevent intergranular corrosion of stainless steel. The main cause of intergranular corrosion of stainless steel known so far is that Cr-carbides are generated on grain boundaries due to the reaction of carbon (C) contained in stainless steel and Cr, which is the main alloying elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/02C22C38/04
CPCC22C38/001C22C38/02C22C38/04C22C38/22C21D2211/005C22C38/34
Inventor 金奎泳朴振镐徐亨锡
Owner POHANG IRON & STEEL CO LTD
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