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Rare earths-containing iron-based solder for stainless steel braze welding and method for braze welding by using same

A mixed rare earth, brazing method technology, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of reducing the shear strength of joints, high melting temperature, and achieve good wettability and caulking ability , good corrosion resistance, the effect of improving wetting and caulking ability

Inactive Publication Date: 2014-05-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing iron-based solder has a high melting temperature, and when it is used for welding, it forms a phosphorus brittle phase, which greatly reduces the shear strength of the joint, and provides a kind of mixed rare earth brazing material for stainless steel brazing. Iron-based solder and method for brazing with it

Method used

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  • Rare earths-containing iron-based solder for stainless steel braze welding and method for braze welding by using same
  • Rare earths-containing iron-based solder for stainless steel braze welding and method for braze welding by using same
  • Rare earths-containing iron-based solder for stainless steel braze welding and method for braze welding by using same

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specific Embodiment approach 1

[0012] Specific implementation mode 1: In this implementation mode, the iron-based solder containing mixed rare earths used for stainless steel brazing is composed of 5% to 20% of Cr, 0.5% to 35% of Ni, and 0.5% to 7% of Si in mass fraction. , 4% to 10% of P, 0.3% to 5% of Cu, 0.01% to 1% of lanthanide mixed rare earths and the balance of Fe; the total mass fraction of Ni and Cr is 15% to 50% %; the total mass fraction of Si and P is 9% to 13%.

[0013] The lanthanide mixed rare earths described in this embodiment are mixed rare earths with high lanthanum content, and the mass fraction of lanthanum in the mixed rare earths with high lanthanum content is 45% to 50%, the mass fraction of Ce is less than 5%, and the mass fraction of Pr is The fraction is lower than 13%, and the mass fraction of Nd is lower than 37%.

[0014] In the iron-based solder containing mischmetal for stainless steel brazing described in this embodiment, a small amount of lanthanide mischmetal (RE) can in...

specific Embodiment approach 2

[0016] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the iron-based brazing material containing mixed rare earths used for stainless steel brazing is composed of 10% to 25% Cr, 5% to 30% by mass fraction % of Ni, 0.5% to 7% of Si, 4% to 8% of P, 0.3% to 5% of Cu, 0.01% to 1% of lanthanide mixed rare earths and the balance of Fe; the Ni The total mass fraction of Si and P is 15%-50%; the total mass fraction of Si and P is 9%-13%. Others are the same as the first embodiment.

[0017] The composition of the iron-based brazing filler metal in this embodiment is better.

specific Embodiment approach 3

[0018] Specific embodiment three: the present embodiment utilizes the iron-based brazing filler metal that is used for stainless steel material brazing to carry out the method for brazing and is finished according to the following steps:

[0019]1. Preparation materials: Weigh 5%~20% Cr powder, 0.5%~35% Ni powder, 0.5%~7% Si powder, 4%~10% P powder, 0.3%~5% % of Cu powder, 0.01% to 1% of lanthanide mixed rare earths and the balance of Fe powder; and the total mass fraction of Ni powder and Cr powder is 15% to 50%; the Si powder and P powder The total mass fraction is 9% to 13% to obtain raw materials; 2. Preparation of iron-based solder by atomization method: first, mix the raw materials weighed in step 1 evenly to obtain the mixed raw materials, and then mix the mixed raw materials under the protection of Ar gas. After the raw material is heated to liquid alloy, it is prepared into alloy powder by atomization method to obtain iron-based solder; 3. Pretreatment: use acetone to...

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Abstract

The invention discloses a rare earths-containing iron-based solder for stainless steel braze welding and a method for braze welding by using the solder, and relates to a rare earths-containing iron-based solder and a method for braze welding by using the solder. The invention aims to solve the problems of the existing iron-based solder that the melting temperature is high, phosphorus brittle phase is caused when the existing iron-based solder is used for welding, and the shearing strength of a joint is greatly lowered. The rare earths-containing iron-based solder for stainless steel braze welding is prepared from Cr, Ni, Si, P, Cu, rare earths of the lanthanide series and Fe according to the mass fraction. Powder of the Fe, Cr, Ni, Cu, P, Si and rare earths of the lanthanide series is heated so as to reach a liquid alloy state, an atomization method is adopted for obtaining alloy powder, the powder and a binder are uniformly mixed, and are coated on a to-be-welded surface of stainless steel, a workpiece to be welded is obtained, the workpiece is put into a vacuum braze welding furnace, and then vacuum braze welding treatment is carried out. The solder and the method have the advantages that the shearing strength of a welding joint can reach 180-200Mpa, and excellent mechanical property can be realized.

Description

technical field [0001] The invention relates to an iron-based solder containing mixed rare earths and a brazing method using it. Background technique [0002] In recent years, the type of stainless steel used in industry has transitioned from austenitic to ferritic. In this situation, the nickel-based solder used for brazing stainless steel is currently The structure of the base material after brazing becomes coarse, and the strength of the brazed part decreases. The coarsening of the structure is considered to be due to the amount of Cr contained in the Ni brazing filler metal, and the percentage by weight of Cr needs to be suppressed to less than 20%. [0003] In addition, since the prices of Ni ingots and Cr ingots have risen in recent years, the cost of Ni brazing filler metals has risen, and low-cost brazing filler metals with reduced Ni content are particularly desired. Iron-based brazing filler metals can replace nickel-based brazing filler metals for stainless stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K1/008B23K1/20
CPCB23K35/3053B23K1/008B23K1/20B23K1/206
Inventor 何鹏阎超张文良陈诚
Owner HARBIN INST OF TECH
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