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Single wire submerged arc welding method of high cr series csef steel

A submerged arc welding and single wire technology, applied in arc welding equipment, welding equipment, welding medium, etc., can solve problems such as narrow groove width and high temperature cracks

Active Publication Date: 2020-02-07
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in submerged arc welding of high-Cr-based CSEF steel, narrowing the groove width or reducing the groove angle are unfavorable conditions for high-temperature cracks during welding.

Method used

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  • Single wire submerged arc welding method of high cr series csef steel
  • Single wire submerged arc welding method of high cr series csef steel
  • Single wire submerged arc welding method of high cr series csef steel

Examples

Experimental program
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Embodiment

[0108] Hereinafter, Examples (No. 1-14) included in the scope of the present invention and Comparative Examples (No. 15-48) whose effects deviate from the scope of the present invention will be described in comparison.

[0109] Three types of base materials having chemical compositions shown in Table 1 were prepared. For the parent material, such as figure 1 As shown, a narrow groove with a plate thickness t of 250 mm, a groove bottom radius of curvature R of 10 mm, and a groove angle θ of 4° was formed by machining as the test body 20 .

[0110] In addition, 17 kinds of welding wires having the chemical components shown in Table 2 were prepared. The wire diameter is 4.0mmφ. In addition, 27 kinds of fluxes having particle sizes and chemical components shown in Table 3 were used. In addition, in Table 2 and Table 3, underlined numerical values ​​show cases that do not satisfy the provisions of the present invention.

[0111] [Table 1]

[0112]

[0113] [Table 2]

[011...

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Abstract

Provides a welding method capable of suppressing high-temperature cracks in the first layer in single-wire submerged arc welding of high-Cr-based CSEF steel. A single-wire submerged arc welding method for high Cr-based CSEF steel, characterized in that the following welding wire and flux are used in combination, wherein the welding wire contains C: less than 0.05% by mass, N: 0.055% by mass or less, Si: more than 0.05% by mass and not more than 0.50% by mass, the balance being Fe and unavoidable impurities, the flux contains CaF 2 : 2 to 30% by mass, CaO: 2 to 20% by mass, MgO: 20 to 40% by mass, Al 2 o 3 : 5 to 25% by mass, Si and SiO 2 The total of: 5 to 25% by mass (SiO 2 Conversion), limited to BaO: 25% by mass or less, ZrO 2 : 10% by mass or less, TiO 2 : Less than 5% by mass.

Description

technical field [0001] The present invention relates to a monofilament submerged arc welding method of high Cr-based CSEF (Creep Strength-Enhanced Ferritic: creep strength-enhanced ferrite) steel. Background technique [0002] Thermal power boilers and steam turbines, chemical reaction vessels (reactors) for desulfurization and upgrading (heavy oil decomposition) operate under high temperature and high pressure, so as materials, 1.25Cr-0.5Mo steel and 2.25Cr-1.0Mo steel are suitable Steel, 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 Mechanical Engineers: American Society of Mechanical Engineers) stand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/362B23K9/18B23K9/23B23K35/30C22C38/00C22C38/54
CPCB23K9/18B23K9/23B23K35/30B23K35/362C22C38/00C22C38/54B23K9/0213B23K9/025B23K9/186B23K2101/18B23K2103/04
Inventor 山下贤井海和也
Owner KOBE STEEL LTD