Austenitic stainless steel welded joint and austenitic stainless steel welding material

An austenitic, welded joint technology used in welding/welding/cutting items, welding/cutting media/materials, welding media, etc.

Inactive Publication Date: 2009-07-29
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, especially when containing a large amount of P exceeding 0.05%, it is restricted from the viewpoint of weldability, so in the case of the austenitic (system) stainless steels disclosed in Patent Document 1 and Patent Document 2, it is not necessarily possible to Explain the effect of making full use of P to improve the creep strength

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  • Austenitic stainless steel welded joint and austenitic stainless steel welding material
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  • Austenitic stainless steel welded joint and austenitic stainless steel welding material

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Embodiment

[0122] Steels 1 to 12 and steels A to D, which are austenitic stainless steels having the chemical compositions shown in Table 1, were melted in a high-frequency heating vacuum furnace, and cast into steel ingots.

[0123] Steels 1 to 12 in Table 1 are steels whose chemical compositions are within the range specified by the present invention. On the other hand, steels A to D in Table 1 are steels of comparative examples whose chemical compositions are outside the conditions specified in the present invention.

[0124] In addition, in austenitic stainless steel tubes used for heat exchange in boilers, the content of P is limited to 0.040% or less as stipulated in JIS G3463. Therefore, 0.03% of the P content of Steel A in Table 1 corresponds to the P content of common austenitic stainless steel used for boiler heat exchange.

[0125] Table 1

[0126]

[0127] After hot forging each steel ingot obtained by the usual method, solution heat treatment was performed at 1200°C, ...

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Abstract

An austenitic stainless steel welded joint comprises the following components (by mass%): C: 0.05-0.25%; Si: 2% or less; Mn: 0.01-3%, P: 0.05-0.5%; S: 0.03% or less; Cr: 15-30%; Ni: 6-55%; sol.Al: 0.001-0.1%; and N: 0.03% or less, with the remainder being Fe and impurities, wherein the relationship represented by the following formula is satisfied: (Cr + 1.5 x Si + 2 x P) / (Ni + 0.31 x Mn + 22 x C + 14.2 x N + 5 x P) = 1.388. The welded joint has high creep strength, is economically advantageous and has excellent welding properties, and therefore can be used as a steel pipe, a steel plate or the like in a wide variety of applications for which high temperature strength, corrosion resistance and welding properties are required. In the formula above, each symbol of element represents the content of the element expressed by mass%.

Description

technical field [0001] The invention relates to an austenitic stainless steel welding joint and an austenitic stainless steel welding material. Specifically, it relates to austenitic stainless steel welded joints and austenitic stainless steel welding materials that can be widely used as steel pipes and steel plates in applications requiring high temperature strength and corrosion resistance. It contains P in a relatively high amount of 0.05% or more, but still has excellent weldability. Background technique [0002] Conventionally, austenitic stainless steels such as JIS SUS304H, SUS316H, SUS321H, SUS347H, SUS310S, etc. have been used in boilers and chemical plants used in high-temperature environments. [0003] However, in recent years, as steam conditions such as boilers have become increasingly high-temperature and high-pressure, the performance requirements for the materials used have become stricter. Since the high-temperature strength of the conventionally used auste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B23K35/30C22C19/05B23K9/23B23K103/04
CPCC22C38/002C22C38/48C22C38/02C22C19/05C22C38/005B23K35/3053C22C38/04C22C38/50
Inventor 小薄孝裕小川和博冈田浩一五十岚正晃
Owner NIPPON STEEL CORP
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