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Welding metal having superior welding embrittlement resistance characteristics

A weld metal and characteristic technology, applied in metal processing equipment, welding medium, welding equipment, etc., can solve the problems that cannot be said to fully cope with the increase of welding line energy, and achieve excellent temper embrittlement resistance, excellent toughness, Excellent effect

Inactive Publication Date: 2013-11-20
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above technologies, although the toughness and temper embrittlement resistance are at a high level, the recommended welding conditions are welding current: 140 to 190A in Patent Document 7, which stipulates the weld metal for arc welding with electrodes. About (welding core diameter φ4.0mm), in Patent Document 8, which stipulates the weld metal by submerged arc welding, the heat input is about 2.0 to 3.6 kJ / mm, and it cannot be said that it can sufficiently cope with the tendency of the increase in welding heat energy.

Method used

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  • Welding metal having superior welding embrittlement resistance characteristics
  • Welding metal having superior welding embrittlement resistance characteristics
  • Welding metal having superior welding embrittlement resistance characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] The chemical composition and ratio [(Mo / (V+Nb)] of various welding wires (W1 to 44) used when forming the weld metal by SAW are shown in Tables 1 and 2 below. In addition, The chemical composition of the weld metal to be formed is shown in the following Tables 3 and 4 together with welding conditions (wire No., heat input conditions, flux used, preheating-interpass temperature) and A value. Evaluation characteristics results of each weld metal [number of oxides of each size, tensile strength TS, toughness (vTr 54 , vTr' 54 ), temper embrittlement resistance (ΔvTr 54 ), SR crack resistance] are shown in Tables 5 and 6 below.

[0150] [Table 1]

[0151]

[0152] *Others: iron and unavoidable impurities

[0153] [Table 2]

[0154]

[0155] *Others: iron and unavoidable impurities

[0156] [table 3]

[0157]

[0158] **Other: iron and unavoidable impurities

[0159] [Table 4]

[0160]

[0161] **Other: iron and unavoidable impurities

[0162] [table 5]...

Embodiment 2

[0177] The chemical composition of various electrode coatings used when forming the weld metal by SMAW is shown in Table 7 below (electrode coating Nos. B1 to 24). In addition, the chemical composition of the weld metal to be formed is shown in Table 8 below together with welding conditions (electrode coating No., heat input conditions, core type, preheating-interpass temperature) and A value. In addition, the evaluation characteristic results of each weld metal [number of oxides of each size, tensile strength TS, toughness (vTr 54 , vTr' 54 ), temper embrittlement resistance (ΔvTr 54 ), SR crack resistance] are shown in Table 9 below.

[0178] [Table 7]

[0179]

[0180] *Others: SrO, BaF 2 Wait

[0181] [Table 8]

[0182]

[0183] **Other: iron and small call to avoid field water quality

[0184] [Table 9]

[0185]

[0186] From Tables 7 to 9, it can be seen as follows (in addition, the following No. represents the test No. of Tables 8 and 9). Nos.50 to 63 ...

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Abstract

This weld metal has a predetermined chemical composition, controls the number of oxides in accordance with size, and has an A value stipulated by the belowmentioned formula of no greater than 5.0. A value=(100×[C]-6×[insol.Cr]-2×[insol.Mo]-24×[insol.V]-13×[insol.Nb])×([Mo]-[insol.Mo]), where [insol.Cr], [insol.Mo], [insol.Nb], and [insol.V] are contents (in mass percent) of Cr, Mo, Nb, and V, respectively, present as a compound after stress-relief heat treatment, and [C] and [Mo] are contents (in mass percent) of C and Mo, respectively, contained in the weld metal.

Description

technical field [0001] The present invention relates to a weld metal used for welding high-strength steel materials such as Cr-Mo steel, a weld metal having improved temper embrittlement resistance, and a welded structure including such a weld metal. Background technique [0002] High-strength Cr-Mo steel and its weld metal parts used in boilers and chemical reaction vessels are used in high-temperature and high-pressure environments, so it is necessary to have high-grade heat resistance (high-temperature strength) while possessing properties such as strength and toughness. ), SR crack resistance [no intergranular cracks during stress relief annealing (SR annealing)] and temper embrittlement resistance (less embrittlement during use in high temperature environments). Especially in recent years, the heat input during welding has been increasing from the standpoint of construction efficiency due to the increase in size and thickness of the equipment. Generally speaking, the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/23B23K35/365C22C38/00C22C38/50
CPCB23K35/3026B23K2203/04C22C38/002B23K35/3053B23K35/365C22C38/04C22C38/22C22C38/44B23K9/186C22C38/46C22C38/42C22C38/26C22C38/48C22C38/02C22C38/20C22C38/001B23K9/23B23K35/3086C22C38/24C22C1/02B23K2103/04
Inventor 名古秀德山下贤大津穰谷口元一坂田干宏
Owner KOBE STEEL LTD
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