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Manufacturing method of Ni-based heat-resistant alloy welded joint and welded joint obtained by using the same

A technology of heat-resistant alloys and welded joints, applied in welding/welding/cutting articles, manufacturing tools, heat treatment furnaces, etc.

Active Publication Date: 2018-04-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, it is known that various cracks mainly caused by metallurgical factors tend to occur in welded parts

Method used

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  • Manufacturing method of Ni-based heat-resistant alloy welded joint and welded joint obtained by using the same
  • Manufacturing method of Ni-based heat-resistant alloy welded joint and welded joint obtained by using the same
  • Manufacturing method of Ni-based heat-resistant alloy welded joint and welded joint obtained by using the same

Examples

Experimental program
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Embodiment

[0246] Alloys having the chemical compositions shown in Table 1 were melted to produce ingots. Using the aforementioned ingot, after forming by hot forging, solution heat treatment was performed to produce Ni-based heat-resistant alloy plates A to E with a thickness of 30 mm, a width of 50 mm, and a length of 100 mm.

[0247] Table 1

[0248]

[0249] Then, after melting an alloy having a chemical composition shown in Table 2 to produce an ingot, hot forging, hot rolling, and machining were performed to produce welding materials W to Z with an outer diameter of 1.2 mm.

[0250] Table 2

[0251]

[0252] In order to simulate the use at high temperature, the Ni-based heat-resistant alloy plate was heated at the heating holding temperature and heating holding time shown in Table 3. Thereafter, heat treatment was performed at the heat treatment holding temperature, heat treatment holding time, and average cooling rate shown in Table 3, except for the welded joints of test ...

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Abstract

A method for manufacturing a welding joint made of a Ni-based heat-resistant alloy includes welding an alloy base material comprising: 0.03-0.12 wt% of C; 1.0 wt% or less of Si; 1.0 wt% or less of Mn; 0.015 wt% or less of P; 0.005 wt% or less of S; 8.0-25.0 wt% of Co; 18.0-27.0 wt% of Cr; 0.1-2.5 wt% of Ti; 0.2-2.0 wt% of Al; 0.0001-0.01 wt% of B; 0.001-0.5 wt% of REM; 0.02 wt% or less of N; 0.01 wt% or less of O; 0-0.05 wt% of Ca; 0-0.05 wt% of Mg; 0-15.0 wt% of Fe; 0-12.0 wt% of Mo; 0-10.0 wt% of W; 0-4.0 wt% of Cu; 0-2.5 wt% of Nb; 0-0.5 wt% of V; and the remainder consisting of Ni and impurities. In the method, the alloy base material is used under a condition that a heating maintaining temperature T_A(C) and a heating maintaining time t_A(h) satisfy the formulas: [600 <= TA <= 850] and [1700 <= TA (1.0 + logtA)]. The alloy base material is thermally treated under a condition that a thermal treatment maintaining temperature T_P(C) and a thermal treatment maintaining time t_P(h) satisfy the formulas: [1050 <= T_P <= 1250] and [-0.1 (T_P / 50 - 30) <= t_P <= -0.1 (T_P / 10 - 145)].

Description

technical field [0001] The invention relates to a manufacturing method of a Ni-based heat-resistant alloy welded joint and a welded joint obtained by using the same. In particular, the present invention relates to a method of manufacturing a welded joint using a Ni-based heat-resistant alloy that has been used for a long time as a high-temperature member such as a main steam pipe or a reheat steam pipe of a thermal power generation boiler, and a welded joint obtained using the same. Background technique [0002] In recent years, from the viewpoint of reducing the environmental load, the high temperature and high pressure of the operating conditions of thermal power generation boilers have been promoted on a global scale, and austenitic heat-resistant materials used as materials for superheater tubes and reheater tubes are required. Alloys or Ni-based heat-resistant alloys have more excellent high-temperature strength and corrosion resistance. [0003] In addition, in the pa...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22F1/10
CPCC22C19/055C22C19/058C22F1/10B23K2103/08C21D9/50C22C19/05C22C19/051
Inventor 平田弘征净德佳奈小川英范小野敏秀田中克树
Owner NIPPON STEEL CORP