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Weld joint and weld material thereof

A technology for welding joints and welding materials, applied in welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of difficulty in ensuring weldability, difficult to use, low Si content, etc., to improve welding workability and durability. The effect of excellent performance and resistance to metal powdering

Inactive Publication Date: 2007-07-04
SUMITOMO METAL IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The welded joint disclosed in Patent Document 1 has a low Si content, so it is difficult to use it in an environment where metal powdering occurs
In the welded joint disclosed in Patent Document 2, when a minimum amount of Si is added to ensure metal powdering resistance, weld solidification cracks occur, making it difficult to ensure excellent weldability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0074] Metal materials with chemical compositions shown in Table 1 and Table 2 were smelted in a high-frequency heating vacuum furnace. After forging the ingot of each metal material by the usual method, solution heat treatment is performed at 1200°C, and a 12mm thick, 50mm wide, and 150mm long restraint weld is produced with a 60° V-groove process of 1.5mm at the butt joint. A sample for a crack test and a sample for evaluating metal powdering resistance with a thickness of 4 mm, a width of 10 mm, and a length of 20 mm.

[0075] Using the obtained sample for the restraint welding crack test, restraint welding its surroundings, using a welding material (welding wire) with an outer diameter of 1.2mm prepared in advance from the base material, under the conditions of welding current 150A, welding voltage 15V, and welding speed 10cm / min Next, multi-layer surfacing is performed by TIG welding. Here, since dilution hardly occurs during TIG welding, the chemical composition of the ...

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Abstract

A weld joint, characterized in that both of a base material and a weld metal have a chemical composition that C: 0.01 to 0.45%, Si: more than 1 % and not more than 4 %, Mn: 0.01 to 2 %, P: 0.05 % or less, S: 0.01 % or less, Cr: 15 to 35 %, Ni: 40 to 78 %, Al: 0.005 to 2 %, N: 0.001 to 0.2 % and Cu: 0.015 to 5.5 %, Ti: a content satisfying the following formula (1): {(Si - 0.01) / 30} + 0.01Cu <= Ti <= 5 (1) wherein an element symbol in the formula (1) means the content (mass %) of the element, and the balance: Fe and impurities. The base material and the weld metal may further contain one or more of Co, Mo, Ta, W, V, Zr, Nb, Hf, B, Ca, Mg and REM.

Description

technical field [0001] The invention relates to a welded joint of a component used in a high-temperature corrosive environment and its welding material. Examples of components used in high-temperature corrosive environments include containers, reaction tubes, and parts used in heat-exchange hydrocarbon reformers and waste heat recovery devices in GTL facilities such as petroleum refineries and petrochemical facilities. . Background technique [0002] Heat exchange for recovering waste heat is often used in order to improve energy efficiency in reforming equipment in petroleum refining and petrochemical facilities, ammonia production equipment, and hydrogen production equipment using petroleum as a raw material. On the other hand, it is conceivable that the demand for clean energy such as hydrogen and methanol gas will increase significantly in the future, and the reformer that is indispensable for their manufacture is required to be large-scale, high in thermal efficiency, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C38/00C22C38/58B23K9/23B23K35/30
CPCC22C19/058C22C19/053C22C19/055
Inventor 小薄孝裕小川和博西山佳孝
Owner SUMITOMO METAL IND LTD
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