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Activated rosin flux for series 400 ferritic stainless steel

A technology of active flux and ferrite, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of reduced corrosion resistance of materials, affecting the quality of seam welding, and limited application fields, so as to improve weldability, The effect of improving welding defects and improving welding quality

Inactive Publication Date: 2018-11-13
合肥久新不锈钢厨具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The 400 series stainless steel is characterized by cheap price, small thermal expansion coefficient, and better chloride stress corrosion resistance than the 300 series stainless steel; however, its disadvantages are that its formability, weldability and tensile strength are lower than those of the 304 stainless steel model. Therefore, its field of use is limited
[0004] During the welding process of 400 series stainless steel, the heat source at the joint will produce partial austenitization, and then a martensite structure will be formed at the grain boundary during the rapid cooling process, and it will cause intergranular grains. Coarse, and make the welding material embrittlement and toughness decrease, and finally affect the welding quality of the joint, and even cracks will occur in severe cases
In addition, the high temperature of welding will also lead to the precipitation of carbon and nitrogen compounds in ferritic stainless steel, and the tendency of intergranular corrosion will be strengthened, resulting in chromium-poor material at the joint, and the corrosion resistance of the material will be reduced, that is, sensitization

Method used

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  • Activated rosin flux for series 400 ferritic stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An active flux for 400 series ferritic stainless steel, according to mass percentage, the raw material components of the active flux include:

[0029] Calcium Fluoride 18.0%, Chromium Trioxide 12.5%, Aluminum Oxide 6.5%, Silicon Oxide 6.0%, Magnesium Oxide 2.6%, Titanium Dioxide 8.7%, Alloy Powder 2.5%, Titanium Aluminum Nitride 0.8%, Potassium Fluoborate 4.6%, Endothermic agent 12.5%, the balance is binder and unavoidable impurity.

[0030] Wherein, the endothermic agent is nanometer calcium carbonate.

[0031] The binder is potassium sodium water glass.

[0032] Sodium potassium water glass has a viscosity of 800-900Mpa·S at 20°C.

[0033] The mass fraction of P element in the impurity elements is lower than 0.05%; the mass fraction of S element is lower than 0.03%.

[0034] The alloy powder is a high-nickel manganese-copper alloy, and the content of nickel element in the alloy powder is 7.5%.

[0035] The active flux provided in this embodiment is used as a subme...

Embodiment 2

[0037] An active flux for 400 series ferritic stainless steel, according to mass percentage, the raw material components of the active flux include:

[0038] Calcium Fluoride 30.0%, Chromium Trioxide 16.4%, Aluminum Oxide 10.0%, Silicon Oxide 8.6%, Magnesium Oxide 4.9%, Titanium Dioxide 11.5%, Alloy Powder 3%, Titanium Aluminum Nitride 1.2%, Potassium Fluoborate 7.5%, Endothermic agent 14.5%, the balance is binder and unavoidable impurity.

[0039] Wherein, the endothermic agent is a mixture of nano calcium carbonate, bentonite and sodium bicarbonate, the content of sodium bicarbonate is 15%; the content of bentonite is 30%.

[0040] The binder is potassium sodium water glass.

[0041] Sodium potassium water glass has a viscosity of 800-900Mpa·S at 20°C.

[0042] The mass fraction of P element in the impurity elements is lower than 0.05%; the mass fraction of S element is lower than 0.03%.

[0043] The alloy powder is a high-nickel manganese-copper alloy, and the content of...

Embodiment 3

[0046] An active flux for 400 series ferritic stainless steel, according to mass percentage, the raw material components of the active flux include:

[0047] Calcium Fluoride 23.5%, Chromium Trioxide 14.9%, Aluminum Oxide 8.3%, Silicon Oxide 7.7%, Magnesium Oxide 3.9%, Titanium Dioxide 10.5%, Alloy Powder 2.8%, Titanium Aluminum Nitride 1.0%, Potassium Fluoborate 6.1%, Endothermic agent 13.9%, balance is binder and unavoidable impurity.

[0048] Wherein, the endothermic agent is a mixture of nano calcium carbonate, bentonite and sodium bicarbonate, the content of sodium bicarbonate is 10%; the content of bentonite is 20%.

[0049] The binder is potassium sodium water glass.

[0050] Sodium potassium water glass has a viscosity of 800-900Mpa·S at 20°C.

[0051] The mass fraction of P element in the impurity elements is lower than 0.05%; the mass fraction of S element is lower than 0.03%.

[0052] The alloy powder is a high-nickel manganese-copper alloy, and the content of nick...

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Abstract

The invention relates to the technical field of soldering flux, in particular to activated rosin flux for series 400 ferritic stainless steel. The activated rosin flux for the series 400 ferritic stainless steel comprises raw materials including calcium fluoride, chromium oxide, aluminum oxide, silicon oxide, magnesium oxide, titanium dioxide, alloy micro powder, TiAlN, potassium fluoborate, heatabsorbent and the balance binder and unavoidable impurities, wherein the heat absorbent contains nano calcium carbonate, bentonite or sodium bicarbonate; the binder is sodapotash water glass; the massfraction of the element P in impurity elements is smaller than 0.05%, and the mass fraction of the element S is smaller than 0.03%; and the alloy micro powder is a high-nickel manganese copper alloy.The activated rosin flux achieves a very good effect in avoiding a welded material from sensitization and embrittlement and is very suitable for submerged-arc welding of the series 400 ferritic stainless steel.

Description

technical field [0001] The invention relates to the technical field of flux, in particular to an active flux for 400 series ferritic stainless steel. Background technique [0002] Stainless steel is the abbreviation of stainless acid-resistant steel, and the steel grades that are resistant to weak corrosive media such as air, steam, water, or have stainless properties are called stainless steel; The steel type is called acid-resistant steel. Due to the difference in chemical composition of the two, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid-resistant steel is generally stainless. Stainless steel does not just refer to one type of steel, but refers to more than one hundred kinds of industrial stainless steel, and each developed stainless steel has good performance in its specific application field. Stainless steel has the characteristics of high hardness, good wear resistance, good co...

Claims

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Application Information

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IPC IPC(8): B23K35/362B23K103/04B23K9/18
CPCB23K9/18B23K35/3605B23K35/362
Inventor 辛松
Owner 合肥久新不锈钢厨具有限公司
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