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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 the problems of high temperature crack suppression in submerged arc welding, and achieve excellent welding operability, excellent soundness, and high temperature suppression. crack effect

Active Publication Date: 2019-06-07
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these make it more difficult to suppress high-temperature cracks in submerged arc welding of high-Cr-based CSEF steels

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

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Comparison scheme
Effect test

Embodiment

[0129] Hereinafter, the Example (No. 1-8) included in the scope of the present invention and the comparative example (No. 9-14) whose effect deviates from the scope of the present invention are compared and demonstrated.

[0130] Three types of base materials having chemical compositions shown in Table 1 were prepared. For the parent material, such as Figure 4 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 .

[0131] In addition, three kinds of welding wires having chemical compositions shown in Table 2 were prepared. The wire diameter is 4.0mmφ. 0.01% by mass of Cu contained in the welding wire shown in Table 2 was contained as an unavoidable impurity. In addition, three kinds of fluxes having particle sizes, chemical components, and basicities shown in Table 3 were used.

[0132] [Table 1]

[0133]

[0134] [Table 2]

[0135]

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Abstract

Provided is a welding method that enables excellent soundness and weldability of a welded part and enables the suppression of high temperature cracking in single submerged arc welding for high chromium CSEF steel. This single submerged arc welding method for high chromium CSEF steel is characterized in that welding is performed under the following conditions: a wire feed rate (V) of 50-120 g / min, a welding rate (v) of 20-60 cm / min, and a deposition amount (V / v) per unit length, obtained according to the ratio of the wire feed rate to the welding rate, of 1.8-4.5 g / cm.

Description

technical field [0001] The present invention relates to a submerged arc welding method, and more specifically, to a single-wire submerged arc welding method for 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 ...

Claims

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Application Information

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