CN103817457A - Rare earths-containing iron-based solder for stainless steel braze welding and method for braze welding by using same - Google Patents

Abstract

The invention discloses an iron-based brazing filler metal containing mixed rare earths and a brazing method thereof for stainless steel brazing, which relates to an iron-based brazing filler metal containing mixed rare earths and a brazing method thereof. The purpose of the invention is to solve the problems that the existing iron-based solder has a high melting temperature and forms a phosphorus brittle phase when used for welding, which greatly reduces the shear strength of the joint. The iron-based solder containing mischmetal for stainless steel brazing is prepared from Cr, Ni, Si, P, Cu, lanthanide mischmetal and Fe according to the mass fraction. After heating Fe, Cr, Ni, Cu, P, Si and lanthanide mixed rare earth (RE) powders to the liquid alloy state, the alloy powder is obtained by atomization method, the powder is mixed with the binder evenly, and coated on the stainless steel to be On the welding surface, the parts to be welded are obtained, and then put into a vacuum brazing furnace for vacuum brazing treatment. Advantages: The shear strength of the welded joint reaches 180-200MPa, and it has good mechanical properties.

Description

An iron-based brazing material containing mixed rare earths for stainless steel brazing and its brazing method

technical field

The invention relates to an iron-based solder containing mixed rare earths and a brazing method using it.

Background technique

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%.

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 steel brazing, but most of the iron-based brazing filler metals used for brazing stainless steel have the characteristics of high melting temperature and impracticality, and some iron-based brazing filler metals with low melting points are currently Due to the high content of P element in the material, there is a risk of forming a phosphorus brittle phase, which greatly reduces the shear strength of the joint.

Contents of the invention

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 brazing filler metal and its brazing method.

The iron-based brazing material containing mixed rare earths for stainless steel brazing consists of 5% to 20% Cr, 0.5% to 35% Ni, 0.5% to 7% Si, 4% to 10% P, It is prepared from 0.3% to 5% Cu, 0.01% to 1% lanthanide mixed rare earths and the balance is Fe; the total mass fraction of Ni and Cr is 15% to 50%; the Si and P The total mass fraction is 9% to 13%.

The method for brazing by utilizing the iron-based brazing filler metal containing mixed rare earths for stainless steel brazing is accomplished in the following steps:

1. Preparation materials: Weigh 5% to 20% of Cr powder, 0.5% to 35% of Ni powder, 0.5% to 7% of Si powder, 4% to 10% of P powder, 0.3% to 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 clean and dry the stainless steel surface to be welded to obtain the pretreated stainless steel to be welded. 4. Coating: first iron-based solder and binder are mixed uniformly to obtain the mixture, and then the mixture is coated on the welding surface of the stainless steel part to be welded after the pretreatment obtained in step 2, and the thickness of the coating layer is 100μm～200μm, to get the piece to be welded; 5. Vacuum welding: First, connect the welding surfaces of the two pieces to be welded together, and then put them into a vacuum brazing furnace, at a vacuum degree of not less than 1×10 ^～2 Pa The temperature is raised from room temperature to 600-700°C at 10°C/min, and the vacuum degree is not lower than 1× ^10-2 Pa and the temperature is 600-700°C. At 10 ^{~ 2} Pa, the temperature is raised to 1100 ~ 1160 °C at a rate of 10 °C / min, and the vacuum degree is not lower than 1 × 10 ^{~ 2} Pa and the temperature is 1100 ~ 1160 ° C. Cool down to room temperature at a rate of 8-12°C/min at a temperature not lower than 1× ^10-2 Pa to obtain stainless steel brazing joints, that is, to complete the brazing using iron-based brazing material containing mixed rare earths for brazing stainless steel materials. Welding method; the volume ratio of the iron-based brazing filler metal and the binder described in step 3 is 1:(0.5～2).

Advantages of the present invention: 1. The iron-based brazing material containing mixed rare earths provided by the present invention for stainless steel brazing reduces the content of nickel element used when brazing stainless steel on the one hand. Because nickel is expensive, the present invention greatly reduces the cost . On the other hand, the addition of alloying elements can effectively keep the melting point of the solder below 1100°C, making the solder more practical, and the addition of a small amount of rare earth elements not only greatly improves the wetting and filling of the solder ability, more effectively avoiding the weakening of brittle elements such as phosphorus to the brazing seam joint, and further improving the mechanical properties of the brazing seam; therefore, the present invention provides a relatively low cost and practical brazing temperature (below 1150°C ), good wettability and seam filling ability on the surface of stainless steel and other metals, strong corrosion resistance, and can effectively avoid phosphorus embrittlement relative to the weakening of the mechanical properties of the brazing seam. Iron containing mixed rare earths for stainless steel brazing Base solder; this solder has excellent wettability to stainless steel, its melting point is suitable for production and use, the brazed joint has good heat resistance and corrosion resistance, and the brazed joint has excellent strength; 2. The obtained brazed stainless steel material The shear strength of the welded joint reaches 180-200MPa, and has good mechanical properties.

Description of drawings

Figure 1 is the SEM image of the 304 stainless steel joint brazed with commonly used nickel-based solder BNi~5, A in Figure 1 represents 304 stainless steel, and B in Figure 1 represents a brittle compound;

Figure 2 is a SEM image of the joint appearance of 304 stainless steel brazed with rare earth iron-based filler metal, A in Figure 2 represents 304 stainless steel, and B in Figure 2 represents a brittle compound;

Fig. 3 is the SEM image of the 304 stainless steel joint brazed with iron-based brazing material containing mixed rare earths for brazing stainless steel materials described in Test 1, and A in Fig. 3 represents 304 stainless steel.

Detailed ways

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%.

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%.

In the iron-based solder containing mischmetal for stainless steel brazing described in this embodiment, a small amount of lanthanide mischmetal (RE) can interact with elements such as nickel (Ni) in the base metal, causing grain boundary Changes in structure, chemical composition and energy affect the diffusion of other elements and the nucleation and growth of new phases, refine the grains, greatly increase the elongation of the solder, and enhance the mechanical properties of the solder. The formation of brittle phosphides is effectively reduced during the welding process, which further improves the mechanical properties of the brazing joint.

The iron-based brazing filler metal containing mischmetal for stainless steel brazing described in the present embodiment basically controls the melting temperature by the solid solution of Fe～Cr～Ni and the eutectic reaction of these elements and intermetallic compounds of Si and P. It can be achieved by adjusting the balance of constituent components, and constructing a good range of components for melting temperature and various properties (heat resistance, corrosion resistance, strength, etc.). Ni is dissolved in Fe-Cr to form a Fe-Cr-Ni solid solution, and it is preferable to contain a large amount in order to improve the heat resistance, corrosion resistance, and strength of the alloy as much as possible, but if the weight percentage exceeds 35%, then A P compound with low strength is formed, resulting in a decrease in the strength of the solder alloy and an increase in cost. If the amount of Ni decreases, the liquidus temperature of this brazing filler metal rises, but even if it is 0%, the target characteristics can still be obtained. For the above reasons, the Ni weight percentage is limited to 35% or less, but the weight percentage is preferably 10 to 35%. Like Ni, Cr is the standard component in the brazing filler metal of the present invention, forms a solid solution of Fe～Cr or Fe～Cr～Ni, and is an important component that improves the heat resistance, corrosion resistance and strength of the alloy, but it is found in the It can also cause problems when brazing ferritic stainless steel substrates. That is, when Cr exceeds 25% by weight, the microstructure of the base material after brazing increases, and the strength of the component decreases. When Cr is less than 5% by weight, corrosion resistance deteriorates. For the above reasons, the Cr weight percentage is limited to 5 to 25%. In addition, in the balance of the properties of the brazing filler metal of the present invention, the total weight percentage of Ni+Cr needs to be 15 to 50%. The influence of Si and P on the melting temperature of the alloy through the eutectic reaction with Fe～Cr～Ni solid solution is decisive, and it also affects brazeability (wetting and spreading to stainless steel substrates) and corrosion resistance and strength components. In addition, in this solder, not only the respective ranges of Si and P, but also the total range of Si+P will play a particularly important role, and the liquidus line will be found when it is lower than the respective lower limit and higher than the upper limit. As the temperature increases, the strength decreases. In the iron-based solder, in order to further improve the joint strength and reduce the influence of phosphorus embrittlement, a small amount of lanthanide mixed rare earth (RE) is added to the solder, which can interact with elements such as nickel (Ni) in the base metal , cause changes in the structure, chemical composition and energy of the grain boundary, affect the diffusion of other elements and the nucleation and growth of new phases, refine the grains, greatly increase the elongation of the solder, and strengthen the solder The mechanical properties of the brazing joint are further improved. Four, the iron-based solder containing mixed rare earths provided by the present invention for stainless steel brazing reduces the content of nickel element used when brazing stainless steel on the one hand, because nickel is expensive, the present invention greatly reduces the cost. On the other hand, the addition of alloying elements can effectively keep the melting point of the solder below 1100°C, making the solder more practical, and the addition of a small amount of rare earth elements not only greatly improves the wetting and filling of the solder The ability to more effectively avoid the weakening of brittle elements such as phosphorus on the brazed joint, so that the mechanical properties of the brazed joint are further improved.

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.

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

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:

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 clean and dry the stainless steel surface to be welded to obtain the pretreated stainless steel to be welded. 4. Coating: first iron-based brazing material and binding agent are mixed uniformly to obtain mixture, and then the mixture is coated on the welding face of the stainless steel part to be welded after the pretreatment that step 2 obtains, and the thickness of the coating layer is 100μm～200μm, to get the piece to be welded; 5. Vacuum welding: First, connect the welding surfaces of the two pieces to be welded together, and then put them into a vacuum brazing furnace, at a vacuum degree of not less than 1×10 ^～2 Pa The temperature is raised from room temperature to 600-700°C at 10°C/min, and the vacuum degree is not lower than 1× ^10-2 Pa and the temperature is 600-700°C. At 10 ^{~ 2} Pa, the temperature is raised to 1100 ~ 1160 °C at a rate of 10 °C / min, and the vacuum degree is not lower than 1 × 10 ^{~ 2} Pa and the temperature is 1100 ~ 1160 ° C. Cool down to room temperature at a rate of 8-12°C/min at a temperature not lower than 1× ^10-2 Pa to obtain stainless steel brazing joints, that is, to complete the brazing using iron-based brazing material containing mixed rare earths for brazing stainless steel materials. Welding method; the volume ratio of the iron-based brazing filler metal and the binder described in step 3 is 1:(0.5～2).

The lanthanide mixed rare earths described in step 1 of 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%, and the mass fraction of Ce is less than 5%. The mass fraction of Pr is less than 13%, and the mass fraction of Nd is less than 37%.

The binder described in the third step of this embodiment is an oily binder, because the oily binder volatilizes slower in the air than the water-based one, the solder paste has a long storage time, and the solder paste coating performance of the oily binder is Better than water-based.

This embodiment adopts iron-based solder with good wettability. During the brazing process, each alloy element can fully diffuse with the base metal. Since the diffusion performance of P is improved, continuous brittleness in the weld is avoided. Phosphide can effectively block the crack propagation path, increase the distribution of toughness phase in the brazing joint, and achieve the improvement of joint strength. The shear strength of the welded joint obtained by brazing stainless steel materials reaches 180-200 MPa, and has good mechanical properties.

Embodiment 4: The difference between this embodiment and Embodiment 3 is that in step 1, 10% to 25% of Cr powder, 5% to 30% of Ni powder, and 0.5% to 7% of Si are weighed by mass fraction Powder, 4% to 8% of P powder, 0.3% to 5% of Cu powder, 0.01% to 1% of lanthanide mixed rare earths and the balance of Fe powder; the total mass fraction of Ni powder and Cr powder is 15 %～50%; the total mass fraction of Si powder and P powder is 9%～13%. Others are the same as in the third embodiment.

Embodiment 5: This embodiment differs from Embodiment 3 or Embodiment 4 in that: the volume ratio of the iron-based brazing filler metal and binder described in Step 3 is 1:(0.8-1.8). Others are the same as the third or fourth specific embodiment.

Embodiment 6: This embodiment differs from Embodiment 3 to Embodiment 5 in that: the thickness of the coating layer in step 3 is 100 μm˜150 μm. Others are the same as the third to fifth specific embodiments.

Embodiment 7: The difference between this embodiment and one of Embodiments 3 to 6 is that in Step 4, the temperature is raised to 1100-1160 at a speed of 10°C/min under the vacuum degree of not less than 1× ^10-2 Pa. ℃, and keep it warm for 8 minutes to 20 minutes at a vacuum degree of not less than 1×10 ^～2 Pa and a temperature of 1100～1160 ℃. Others are the same as the third to sixth embodiments.

Specific Embodiment Nine: The difference between this embodiment and one of Specific Embodiments 3 to 8 is that in step 4, the vacuum degree is not lower than 3.5×10 ^～3 ～4.5×10 ^～3 Pa at 10°C/min from room temperature Raise the temperature to 600-700°C, and after keeping the temperature at 600-700°C for 10min-30min at a vacuum degree of not less than 3.5× ¹⁰ ～3-4.5× ^10-3 Pa, the vacuum degree is not less than 3.5×10-3 ^{Pa. 3} ~ 4.5×10 ^～3 Pa and then increase the temperature to 1100～1160℃ at a rate of 10℃/min, and the vacuum degree is not lower than 3.5×10 ^～3 ～4.5×10 ^～3 Pa and the temperature is 1100～1160℃ After keeping it warm for 5min to 35min, the temperature was lowered to room temperature at a rate of 8-12°C/min under a vacuum degree of not less than ^3.5 ×10-3-4.5× ^10-3 Pa to obtain stainless steel brazed joints. Others are the same as the third to eighth specific embodiments.

Adopt following test to verify effect of the present invention:

Test one: the method of brazing by using the iron-based brazing filler metal containing mixed rare earths for stainless steel brazing is completed in the following steps:

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 clean and dry the stainless steel surface to be welded to obtain the pretreated stainless steel to be welded. 4. Coating: first iron-based brazing material and binding agent are mixed uniformly to obtain mixture, and then the mixture is coated on the welding face of the stainless steel part to be welded after the pretreatment that step 2 obtains, and the thickness of the coating layer is 100μm～200μm, to get the piece to be welded; 5. Vacuum welding: First, connect the welding surfaces of the two pieces to be welded together, and then put them into a vacuum brazing furnace, at a vacuum degree of not less than 1×10 ^～2 Pa The temperature is raised from room temperature to 600-700°C at 10°C/min, and the vacuum degree is not lower than 1× ^10-2 Pa and the temperature is 600-700°C. At 10 ^{~ 2} Pa, the temperature is raised to 1100 ~ 1160 °C at a rate of 10 °C / min, and the vacuum degree is not lower than 1 × 10 ^{~ 2} Pa and the temperature is 1100 ~ 1160 ° C. Cool down to room temperature at a rate of 8-12°C/min at a temperature not lower than 1× ^10-2 Pa to obtain stainless steel brazing joints, that is, to complete the brazing using iron-based brazing material containing mixed rare earths for brazing stainless steel materials. Welding method; the volume ratio of the iron-based brazing filler metal and the binder described in step 3 is 1:(0.5～2).

The stainless steel described in this test is 304 stainless steel.

The binder described in step three of this test is an oily binder.

304 stainless steel is brazed with commonly used nickel-based brazing filler metal BNi~5, and 304 stainless steel is welded with rare earth-free iron-based brazing filler metal, and observed with a scanning electron microscope, as shown in Figures 1 to 3, Figure 1 It is the SEM image of the 304 stainless steel joint brazed with commonly used nickel-based solder BNi～5. A in Figure 1 represents 304 stainless steel, and B in Figure 1 represents a brittle compound; Appearance SEM figure, A in Fig. 2 represents 304 stainless steel, and B in Fig. 2 represents a brittle compound; Fig. 3 is the iron-based solder brazing 304 stainless steel joint appearance for the brazing of stainless steel materials described in this test SEM image, A in Figure 3 represents 304 stainless steel; from Figures 1 to 3, it can be seen that there are continuously distributed brittle compounds in the 304 stainless steel joints brazed with common nickel-based solder BNi~5 and rare earth-free iron-based solder , when the joint is stressed, these brittle compounds provide a path for crack propagation, greatly reducing the reliability of the brazed joint. However, using the iron-based brazing material containing miscellaneous rare earths used in the brazing of stainless steel materials according to this patent to braze 304 stainless steel joints, there is no continuous brittle compound in the joints. During the brazing process, the lanthanide added in the solder Rare earth effectively promotes the diffusion of elements and avoids the formation of brittle compounds.

Detect the 304 stainless steel joints brazed with commonly used nickel-based brazing materials BNi~5, the 304 stainless steel joints brazed with rare earth-free iron-based brazing materials, and the iron-based brazing materials containing mixed rare earths used for brazing stainless steel materials described in this test The shear strength of 304 stainless steel joints, it can be seen that the shear strength of 304 stainless steel joints brazed with nickel-based solder BNi~5 is 150-170MPa; ; The shear strength of the 304 stainless steel joints brazed with iron-based brazing material containing mixed rare earths for stainless steel brazing described in this test is 180-200MPa.

Claims (6)

1. for an iron-based solder for the alloy containing mixed rare earth of stainless steel braze welding, it is characterized in that be that Fe be prepared from by mass fraction by 5%～20% Cr, 0.5%～35% Ni, 0.5%～7% Si, 4%～10% P, 0.3%～5% Cu, 0.01%～1% group of the lanthanides mishmetal and surplus for the iron-based solder of the alloy containing mixed rare earth of stainless steel braze welding; The gross mass mark of described Ni and Cr is 15%～50%; The gross mass mark of described Si and P is 9%～13%.

2. the iron-based solder of a kind of alloy containing mixed rare earth for stainless steel braze welding according to claim 1, the iron-based solder that it is characterized in that the described alloy containing mixed rare earth for stainless steel braze welding is by mass fraction by 10%～25% Cr, 5%～30% Ni, 0.5%～7% Si, and 4%～8% P, 0.3%～5% Cu, 0.01%～1% group of the lanthanides mishmetal and surplus are that Fe is prepared from; The gross mass mark of described Ni and Cr is 15%～50%; The gross mass mark of described Si and P is 9%～13%.

3. the method for utilizing the iron-based solder of a kind of alloy containing mixed rare earth for stainless steel material soldering described in claim 1 to carry out soldering, is characterized in that utilizing the method for carrying out soldering for the iron-based solder of the alloy containing mixed rare earth of stainless steel material soldering to complete according to the following steps:

One, prepare material: taking 5%～20% Cr powder, 0.5%～35% Ni powder, 0.5%～7% Si powder, 4%～10% P powder, 0.3%～5% Cu powder, 0.01%～1% group of the lanthanides mishmetal and surplus by mass fraction is Fe powder; And described Ni powder and the gross mass mark of Cr powder are 15%～50%; Described Si powder and the gross mass mark of P powder are 9%～13%, obtain raw material; Two, atomization is prepared iron-based solder: the raw material first step 1 being taken mixes, and obtains mixing rear raw material, and after mixing under the protection of Ar gas, heating raw materials, to liquid alloy, utilizes atomization to be prepared into alloy powder, obtains iron-based solder; Three, pretreatment: adopt acetone stainless steel junction to be welded is cleaned and is dried, obtain pretreatment after stainless steel treat weldment; Four, apply: first iron-based solder is mixed with binding agent, obtains mixture, then mixture is coated in to the pretreatment that step 2 obtains after stainless steel treat on the solder side of weldment, the thickness of coat is 100 μ m～200 μ m, obtains treating weldment; Five, vacuum welding: first two solders side for the treatment of weldment are docking together, then put into vacuum brazing furnace, be not less than 1 × 10 in vacuum ^～2under Pa, be warming up to 600～700 ℃ with 10 ℃/min from room temperature, and be not less than 1 × 10 in vacuum ^～2pa and temperature are to be incubated after 10min～30min at 600～700 ℃, are not less than 1 × 10 in vacuum ^～2under Pa, be warming up to 1100～1160 ℃ with the speed of 10 ℃/min again, and be not less than 1 × 10 in vacuum ^～2pa and temperature are to be incubated after 5min～35min at 1100～1160 ℃, are not less than 1 × 10 in vacuum ^～2under Pa, be cooled to room temperature with 8～12 ℃/min speed again, obtain stainless steel braze welding connector, complete the method for welding of utilization for the iron-based solder of the alloy containing mixed rare earth of stainless steel material soldering; The volume ratio of the iron-based solder described in step 3 and binding agent is 1:(0.5～2).

4. utilization according to claim 3 is for the method for welding of the iron-based solder of the alloy containing mixed rare earth of stainless steel material soldering, it is characterized in that taking 10%～25% Cr powder, 5%～30% Ni powder, 0.5%～7% Si powder by mass fraction in step 1,4%～8% P powder, 0.3%～5% Cu powder, 0.01%～1% group of the lanthanides mishmetal and surplus are Fe powder; Described Ni powder and the gross mass mark of Cr powder are 15%～50%; Described Si powder and the gross mass mark of P powder are 9%～13%.

5. utilization according to claim 3 is for the method for welding of the iron-based solder of the alloy containing mixed rare earth of stainless steel material soldering, and the volume ratio that it is characterized in that the iron-based solder described in step 3 and binding agent is 1:(0.8～1.8).

6. the method that utilization according to claim 3 is carried out soldering for the iron-based solder of the alloy containing mixed rare earth of stainless steel material soldering, is characterized in that being not less than 1 × 10 in vacuum in step 4 ^～2under Pa, be warming up to 1100～1160 ℃ with the speed of 10 ℃/min again, and be not less than 1 × 10 in vacuum ^～2pa and temperature are to be incubated 8min～20min at 1100～1160 ℃.

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