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Process for producing stainless steel diffusion-joined product

A diffusion bonding and manufacturing method technology, applied in the direction of manufacturing tools, welding/welding/cutting items, welding equipment, etc., can solve problems such as difficulty in obtaining joint strength, increased cost, and reduced corrosion resistance, and achieve joint strength and sealing Excellent, reduced manufacturing cost, low temperature effect

Active Publication Date: 2016-04-20
NIPPON STEEL STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages compared with the direct method because the cost increases due to the use of the insert material, and the joint part is made of different metals, which sometimes leads to a decrease in corrosion resistance.
[0004] On the other hand, the direct method is generally difficult to obtain sufficient joint strength compared with the insertion material insertion method

Method used

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  • Process for producing stainless steel diffusion-joined product
  • Process for producing stainless steel diffusion-joined product
  • Process for producing stainless steel diffusion-joined product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Steel plates having the chemical compositions shown in Table 1 were prepared. D-1 to D-3 are steels with γmax less than 100, M-1 to M-2 are steels classified as so-called martensitic stainless steels, F-1 is ferritic single-phase steel, and A-1 is austenitic single-phase steel. Table 1 shows the thickness, surface finish, and surface roughness Ra of the steel sheet. Regarding the metal structure of each prepared steel plate, D-1 to D-3 are ferrite + carbide, M-1 to M-2 are ferrite phase + martensite phase, and M-3 is martensite single phase. Phase, F-1 is ferrite single phase, A-1 is austenite single phase.

[0092] [Table 1]

[0093]

[0094] A flat test piece of 20 mm×20 mm was cut out from each steel plate, and two test pieces were superimposed in the following method to try diffusion bonding.

[0095] The two test pieces to be tried for diffusion bonding are stacked so that their surfaces are in contact with each other, and the surface pressure (contact surfa...

Embodiment 2

[0112] Smelting and hot-rolling the steel with the chemical composition shown in Table 3 to obtain a hot-rolled plate with a plate thickness of 3 to 4 mm, followed by annealing, pickling, cold rolling, finishing annealing, and pickling to obtain a plate A steel plate for testing with a thickness of 1.0mm. D-11 to D-15 are two-phase steels that are the object of the present invention, F-11 is a ferritic single-phase steel, and A-11 is an austenitic single-phase steel. Table 3 also describes the plate thickness, surface finish, and surface roughness Ra of the steel plate. Regarding the metal structure of each steel sheet, D-11 to D-15 are ferrite+carbide, F-11 is a ferrite single phase, and A-11 is an austenite single phase.

[0113] [table 3]

[0114]

[0115] A 100 mm square steel material (hereinafter referred to as "flat material") was produced by cutting from each test steel plate of steels D-11 to D-15. In addition, a steel material consisting of a frame with a width...

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Abstract

A process for producing a stainless steel diffusion-joined product is disclosed for the purpose of providing a stainless steel diffusion-joined product having excellent reliability of a joint by a "direct process" which can be carried out at a workload equivalent to that of a conventional insertion process using an insert material. This process includes bringing stainless steel materials into direct contact with each other and unifying the materials through diffusion joining, wherein: at least one of the stainless steel materials which are to be brought into contact with each other is a duplex stainless steel which has an austenization initiation temperature at heating, namely Ac1, of 650 to 950 DEG C and an austenite / ferrite two-phase temperature region falling within a range of 880oC or higher; and the diffusion joining is made to proceed under the conditions of contact surface pressure of 1.0MPa or less and heating temperature of 880 to 1080 DEG C, while being accompanied with grain boundary migration occurring during the ferrite-to-austenite transformation of the duplex stainless steel.

Description

technical field [0001] The present invention relates to a method of manufacturing stainless steel diffusion bonded articles by diffusion bonding between stainless steel materials without intervening materials. Background technique [0002] Diffusion bonding is one of the joining methods between stainless steel materials. Stainless steel diffusion bonding products assembled by diffusion bonding are suitable for heat exchangers, mechanical parts, fuel cell parts, home appliance parts, factory parts, decorative components, Various uses such as building materials. Among the diffusion bonding methods, there are "insertion material insertion method" in which an insertion material is inserted into the bonding interface and joined by solid phase diffusion or liquid phase diffusion, and "direct diffusion bonding method" in which the surfaces of stainless steel materials are directly contacted to perform diffusion bonding. Law". [0003] As the insertion method of the insertion mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00C22C38/00
CPCC22C38/00B23K20/02C22C38/001C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C21D6/002C21D9/50B23K35/308B23K35/3086B23K2103/05B23K20/00B23K20/023B23K20/227
Inventor 须釜淳史西田幸宽景冈一幸堀芳明奥学
Owner NIPPON STEEL STAINLESS STEEL CORP
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