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Welding material for ni-based heat-resistant alloy, and welded metal and welded joint each using same

A technology of heat-resistant alloys and welding materials, applied in welding/cutting media/materials, welding/welding/cutting items, welding media, etc., which can solve problems such as stress relaxation cracks and residual stress relaxation cracks that are not considered

Inactive Publication Date: 2015-05-20
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the above-mentioned Patent Documents 6 to 8, stress relaxation relaxation cracks are not considered at all.
Therefore, the weld metal obtained by using the welding materials proposed in Patent Document 6 to Patent Document 8 also has a problem about stress relaxation cracking.

Method used

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  • Welding material for ni-based heat-resistant alloy, and welded metal and welded joint each using same
  • Welding material for ni-based heat-resistant alloy, and welded metal and welded joint each using same
  • Welding material for ni-based heat-resistant alloy, and welded metal and welded joint each using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0133] The ingot is melted and cast in the laboratory with the chemical composition shown in Table 1, and is made into a plate with a thickness of 12mm, a width of 50mm, and a length of 100mm through hot forging, hot rolling, heat treatment and mechanical processing. The plate is used as the plate for welding base material.

[0134] In addition, the ingots obtained by melting and casting the materials of symbols 1 to 6 having the chemical compositions shown in Table 2 were produced by hot forging, hot rolling, and mechanical processing to have an outer diameter of 1.2 mm and a length of 1000mm of welding material (welding wire).

[0135] Table 1

[0136] Table 1

[0137]

[0138] Table 2

[0139]

[0140] In the length direction of the above-mentioned plate for welding the base metal, a V-shaped groove with an angle of 30° and a thickness of the blunt edge of 1 mm is processed, and then "DNiCrFe-3" specified in JIS Z3224 (1999) is used as an electrode, Constraint...

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Abstract

Disclosed is a welding material for an Ni-based heat-resistant alloy, which has a chemical composition that contains 0.06-0.18% of C, 0.5% or less of Si, 1.5% or less of Mn, 46-56% of Ni, 10-15% of Co, 20-25% of Cr, more than 10.0% but 14.0% or less of Mo, 0.01-0.5% of Ti, 0.1-1.0% of Al and 0.006% or less of N, and additionally if necessary, 0.1% or less of Nd with the balance made up of Fe and impurities, while controlling O, P and S contained as impurities to 0.02% or less, 0.008% or less, and 0.005% or less, respectively. The welding material for an Ni-based heat-resistant alloy exhibits excellent high-temperature cracking resistance during the welding. A welded metal that has high-temperature cracking resistance during the welding, stress relaxation cracking resistance when in use for a long period of time at high temperatures, and good creep strength can be provided using the above-described welding material. In addition, a welded joint can be provided using the above-described welding material, said welded joint being composed of a base of an Ni-based heat-resistant alloy that has excellent high-temperature strength and a welded metal that has high-temperature cracking resistance during the welding, stress relaxation cracking resistance when in use for a long period of time at high temperatures, and good creep strength.

Description

technical field [0001] The present invention relates to a welding material for a Ni-based heat-resistant alloy, a weld metal and a welded joint using the welding material. Specifically, it relates to a welding material suitable for welding Ni-based heat-resistant alloys used in equipment used at high temperatures, such as boilers for power generation, and weld metals and welded joints obtained by using the welding materials. Ni-based heat-resistant alloys in. Background technique [0002] In recent years, from the viewpoint of reducing the environmental load, the operating conditions of power generation boilers and the like have been increased to high temperature and high pressure globally, and materials used in power generation boilers and the like have been required to have better high-temperature strength. [0003] As a material satisfying such requirements, there is, for example, a Ni-based heat-resistant alloy specified in UNS 06617. In addition, Patent Document 1 to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30C22C19/05
CPCB23K35/3033B23K2103/26C22C19/055
Inventor 平田弘征吉泽满小川和博伊势田敦朗仙波润之
Owner NIPPON STEEL CORP
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