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First layer submerged arc welding method of high cr series csef steel

A technology of submerged arc welding and welding wire, which is applied in arc welding equipment, welding equipment, welding medium, etc., can solve the problem that it is difficult to apply to thermal power boilers, etc., and achieve the effect of inhibiting the occurrence of high temperature cracks in the primary layer.

Inactive Publication Date: 2019-07-02
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the welding method of Patent Document 1, which uses foreign objects and materials as spacers, is difficult to apply to thermal power boilers, etc. from the viewpoints of productivity, economy, and safety levels of joint performance.

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  • First layer submerged arc welding method of high cr series csef steel
  • First layer submerged arc welding method of high cr series csef steel
  • First layer submerged arc welding method of high cr series csef steel

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Embodiment

[0130] The mode for carrying out the present invention has been described above, and below, the examples in which the effects of the present invention were confirmed are compared with the comparative examples which do not satisfy the requirements of the present invention, and will be specifically described. In addition, the present invention is not limited by this embodiment, and can also be modified and implemented within the range shown in the technical solution, and these are included in the technical scope of the present invention.

[0131] 〔Creating a test body〕

[0132] Prepare a plate made of high-Cr-based CSEF steel with the composition shown in Table 1, with a plate thickness t of 250mm, and machine it so that the groove bottom has a radius of curvature R of 10mm and a groove angle θ of 4°. Narrow groove as the base material (refer to Figure 5 ). In addition, prepare fillers of the shape (metal powder, steel grain) and composition shown in Table 4, and fill the gro...

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Abstract

A submerged arc welding method for high-Cr creep strength-enhanced ferritic (CSEF) steel is provided which is capable of inhibiting the formation of hot cracks in a first layer, without increasing the number of steps and the amount of work. The present invention is characterized in that a metal powder or cut wire (21f) which includes not more than 0.10 mass% of C, not more than 0.50 mass% of Si, not more than 1.50 mass% of Mn, not more than 0.025 mass% of P, and not more than 0.025 mass% of S, the remainder comprising Fe and unavoidable impurities, is used to fill a groove in a base metal (10) to a dispersion height (h) of 1.0-4.0 mm, and first-layer welding is performed. In the first-layer welding, a reduction in the melting point of the welded metal is inhibited by the metal powder (21f) or the like, and thus hot cracks can be inhibited.

Description

technical field [0001] The invention relates to a submerged arc welding method of high-Cr series CSEF (Creep Strength-Enhanced Ferritic steel: iron-based steel with enhanced creep strength) steel, in particular to a first-layer welding method. Background technique [0002] 1.25Cr-0.5Mo steel and 2.25Cr-1.0Mo steel are suitable as materials for thermal power boilers and steam turbines, chemical reaction vessels (reactors) for desulfurization and upgrading (decomposition of heavy oil) because they all operate under high temperature and high pressure , 2.25Cr-1.0Mo-V steel, etc. In recent years, effective use of heavy oil and petroleum refining have required further energy efficiency, and applications of high-Cr-based CSEF steels containing 8% by mass or more of Cr have been studied. Among the high Cr-based CSEF steels, there are SA387Gr.91, SA213Gr.T91 and the like prescribed by ASTM (American Society for Testing and Materials) standards and ASME (American Society of Mechanic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/18B23K9/23B23K35/362
CPCB23K9/18B23K9/23B23K35/30B23K35/362
Inventor 山下贤井海和也
Owner KOBE STEEL LTD