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Welding material for austenitic heat-resistant steel, weld metal and weld structure, and method for manufacturing weld metal and weld structure

A welding material, austenitic technology, applied in welding/welding/cutting items, welding/cutting medium/material, welding medium, etc., can solve the problems of insufficient water vapor oxidation resistance and insufficient creep strength

Active Publication Date: 2020-05-15
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Cr content of the aforementioned ASME T91 is small, so the water vapor oxidation resistance is not sufficient and the creep strength is not sufficient

Method used

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  • Welding material for austenitic heat-resistant steel, weld metal and weld structure, and method for manufacturing weld metal and weld structure
  • Welding material for austenitic heat-resistant steel, weld metal and weld structure, and method for manufacturing weld metal and weld structure
  • Welding material for austenitic heat-resistant steel, weld metal and weld structure, and method for manufacturing weld metal and weld structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] From an ingot obtained by melting and casting steel having the chemical composition shown in Table 1, hot forging, hot rolling, heat treatment, and machining were used to produce a plate (base material) and plate with a thickness of 15 mm, a width of 50 mm, and a length of 100 mm. A plate with a thickness of 4mm, a width of 200mm, and a length of 500mm. Furthermore, a cut filler (cut filler) having a square size of 2 mm and a length of 500 mm was produced by machining using the plate material having a plate thickness of 4 mm. Various performance evaluation tests shown below were performed using these.

[0163] [Table 1]

[0164]

[0165]

[0166] On the end of the length direction of the above-mentioned base material, the figure 1 Beveling of the shape shown. Thereafter, the two grooved base materials were butt-jointed, butt welding was performed by TIG welding using cut filler obtained from the same plate material as each base material as a filler metal. Two ...

Embodiment 2

[0179] A plate (base material) with a thickness of 15 mm, a width of 50 mm, and a length of 100 mm was produced from an ingot obtained by melting and casting steel having the chemical composition shown in Table 3 by hot forging, hot rolling, heat treatment, and machining. Using this, various performance evaluation tests shown below were carried out.

[0180] [table 3]

[0181]

[0182]

[0183] On the end of the length direction of the above-mentioned base material, the figure 1 Beveling of the shape shown. Thereafter, the two base metals with grooves were butt-jointed, and the cutting filler obtained from the plate material of steel A was used as a filler metal, and stack welding was performed in the grooves by manual TIG welding. Two welded joints were made for each base material with a heat input of 9 to 15 kJ / cm.

[0184] After that, for one welded joint, the heating and cooling cycles of "room temperature → 650°C x 108 hours → room temperature" were repeated five...

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PUM

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Abstract

A welding material for austenitic heat-resistant steel having a chemical composition, by mass, of 0.06 to 0.14% of C, 0.10 to 0.40% of Si, 2.0 to 4.0% of Mn, 0.020% or less of P, 2.0 to 4.0% of Cu, 15.0 to 19.0% of Ni, 16.0 to 20.0% of Cr, 0.50 to 1.50% of Mo, 0.30 to 0.60% of Nb, 0.10 to 0.30% of N, 0.030% or less of Al, 0.020% or less of O, 0 to 0.0030% of S, 0 to 0.0030% of Sn, 0 to 0.0030% ofBi, 0 to 0.0030% of Zn, 0 to 0.0030% of Sb, 0 to 0.0030% of As, 0 to 0.50% of V, 0 to 0.50% of Ti, 0 to 0.50% of Ta, 0 to 2.0% of Co, 0 to 0.020% of B, 0 to 0.020% of Ca, 0 to 0.020% of Mg, 0 to 0.06%of REM, with the remainder being made up by Fe and impurities, and containing two or more elements selected from S, Sn, Bi, Zn, Sb, and As in the range satisfying [0.0005 <= S + Sn + Bi + Zn + Sb + As <= 0.0030].

Description

technical field [0001] The present invention relates to a welding material for austenitic heat-resistant steel, a welding metal and a welding structure, and a method for manufacturing the welding metal and the welding structure. Background technique [0002] ASME T91 steel has been widely used in the past as the superheater tube material of exhaust heat recovery boilers. However, from the viewpoint of reducing the environmental load, an increase in steam temperature is being promoted. The above-mentioned ASME T91 has a small Cr content, so the steam oxidation resistance is not sufficient and the creep strength is also not sufficient. Therefore, there is a tendency to apply austenitic stainless heat-resistant steel used for superheater tubes of coal-fired power boilers, such as disclosed in Patent Documents 1 and 2, to the high-temperature portion of the superheater tube. [0003] When these heat-resistant austenitic stainless steels are used as structures, they are general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30C22C38/00C22C38/54
CPCB23K35/0255B23K35/30B23K35/3053B23K35/3066B23K35/308B23K35/3086C22C38/00C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/58C22C38/60C21D2211/001B23K2103/04
Inventor 平田弘征净德佳奈栗原伸之佑田中克树
Owner NIPPON STEEL CORP