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Weld metal having excellent temper embrittlement resistance

一种焊接金属、特性的技术，应用在焊接金属领域，能够解决未考虑耐回火脆化特性等问题，达到优异耐回火脆化特性、提高韧性、特性优异的效果

Inactive Publication Date: 2014-07-23
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resistance to temper embrittlement is not considered

Method used

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  • Weld metal having excellent temper embrittlement resistance
  • Weld metal having excellent temper embrittlement resistance
  • Weld metal having excellent temper embrittlement resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0086] Hereinafter, the present invention is described in more detail through the examples, but the following examples do not limit the nature of the present invention, and can also be appropriately modified and implemented within the scope of being able to meet the purpose of the foregoing and the following, and these are all included in the scope of the present invention. within the range of technology.

[0087] Using base metals having the following compositions, weld metals were produced under the welding conditions described below, and after heat treatment, various characteristics were evaluated.

[0088] [Base material composition (mass%)]

[0089] C: 0.12%, Si: 0.23%, Mn: 0.48%, P: 0.004%, S: 0.005%, Cu: 0.04%, Al: <0.002%, Ni: 0.08%, Cr: 2.25%, Mo: 0.99% , V: 0.004%, Ti: 0.002%, Nb: 0.005% (balance: iron and unavoidable impurities)

[0090] [Soldering conditions]

[0091] Welding method: automatic shielded metal arc welding (SMAW)

[0092] Base material thickness: ...

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PUM

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Abstract

A weld metal according to the present invention has a specified chemical component composition, wherein the value (A) defined by formula (1) is 0.12 or greater and the number of carbide particles each having an equivalent circle diameter of more than 0.5 mum contained in the weld metal per grain boundary length is 0.25 particles / mum or less. Value (A) = ([V] / 51+[Nb] / 93) / ([Cr] / 52+[Mo] / 96) (1) In the formula, [V], [Nb], [Cr] and [Mo] represent the contents (mass%) of V, Nb, Cr and Mo, respectively, 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, to a weld metal having improved temper embrittlement resistance, and to a welded structure including such a weld metal. Background technique [0002] High-strength Cr-Mo steel used in boilers and chemical reaction vessels and its welded metal parts are used in high-temperature and high-pressure environments, so characteristics such as strength and toughness are required, and a high level of heat resistance (high temperature strength), SR crack resistance [no grain boundary cracks will occur during stress relief annealing (SR annealing)] and temper embrittlement resistance (less embrittlement during use in high temperature environments). In particular, in recent years, with the increase in wall thickness due to the enlargement of equipment, from the viewpoint of construction efficiency, the heat input during welding is increasing. Generally,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30C22C38/26C22C38/54B23K9/23
CPCB23K9/23B23K35/3086B23K35/365C21D9/50C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/32C22C38/34C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48B23K2103/04B23K35/30C22C38/54B23K35/3053B23K35/3093B23K35/308B23K35/3602C22C38/50B23K35/0261B23K35/0266
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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