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A gas-shielded mineral powder type 314 heat-resistant stainless steel flux-cored welding wire

A technology of heat-resistant stainless steel and flux-cored welding wire, applied in welding equipment, welding media, welding/cutting media/materials, etc., can solve problems such as inability to meet service conditions, no special 314 stainless steel welding materials, and insufficient content of alloying elements. Achieve the effects of avoiding the performance degradation of welded joints, convenient and efficient mass production, and a wide range of welding current

Active Publication Date: 2021-12-31
BEIJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

Due to the lack of alloying elements, the low-strength matching welded joint has a severe decline in high temperature resistance, oxidation resistance, and high temperature creep resistance, making the overall welded joint unsuitable for the working conditions of the base metal and unable to meet its requirements. The service conditions of the base metal application will eventually lead to the failure of the entire welded structure very quickly
In addition, when using straight strips from 314 stainless steel for argon arc welding, the production efficiency is very low, and it is only suitable for welding 314 thin plates
When the 314 wire is welded by argon arc welding or inert gas protection, as the welding process progresses, the temperature of the welding area and the heat-affected zone rises, and the weld seam that is first solidified is directly exposed to the air, and its surface will be exposed to the oxygen in the air. The reaction occurs, causing the surface of the weld to oxidize, which affects the quality of the weld surface
[0006] At present, because there is no special 314 stainless steel welding material, a small number of users use 310 stainless steel welding wire for welding
The chemical composition of 310 stainless steel and 314 stainless steel is similar, but due to the different uses and working environments of 314 stainless steel and 310 stainless steel, when 310 stainless steel welding consumables are used to weld 314 stainless steel, there is also the problem of insufficient alloy element content, which makes the resistance of welded joints at high temperatures The thermal performance is reduced, so that the life of the welded structure is reduced
On the other hand, the 310 welding wire currently on the market, because the welding seam structure of this welding wire is a single-phase austenite structure, the grains are easy to grow during the welding process. Under the action of welding stress, even welding The 310 base metal is also prone to thermal cracks. When welding 314 stainless steel, the cracking of the weld seam is more likely to occur

Method used

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  • A gas-shielded mineral powder type 314 heat-resistant stainless steel flux-cored welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1. A 314 stainless steel strip of 10×0.4 (10 mm in width and 0.4 mm in thickness) is selected, and the filling rate is 24%. After drawing and reducing the diameter, a welding wire with a diameter of 1.2 mm is obtained.

[0039] The mass percent of each alloy composition in the powder core is:

[0040] The mass percentage of rutile is 18%; the mass percentage of marble is 4%; the mass percentage of feldspar is 5%; the mass percentage of fluorite is 4%; the mass percentage of quartz is 5% %; the mass percentage of bismuth oxide is 0.1%; the mass percentage of aluminum oxide is 3%; the mass percentage of magnesia is 2%. The mass percentage of metal chromium powder is 25%; the mass percentage of metal nickel is 22%; the mass percentage of electrolytic manganese metal is 3%; the mass percentage of No. 45 ferrosilicon is 2%; the mass percentage of mixed rare earth The percentage content is 3%; the mass percentage content of ferromolybdenum (same as before) is 3%; t...

Embodiment 2

[0042] Embodiment 2. A 10×0.4 (10 mm in width and 0.4 mm in thickness) 314 stainless steel strip is selected, and the filling rate is 28%. After drawing and reducing the diameter, a welding wire with a diameter of 1.6 mm is obtained.

[0043] The mass percentage of rutile is 20%; the mass percentage of marble is 3%; the mass percentage of feldspar is 5%; the mass percentage of fluorite is 6%; the mass percentage of quartz is 5% %; the mass percentage of bismuth oxide is 0.2%; the mass percentage of aluminum oxide is 3%; the mass percentage of magnesia is 3%. The mass percentage of metal chromium powder is 20%; the mass percentage of metal nickel is 20%; the mass percentage of electrolytic manganese metal is 4%; the mass percentage of No. 45 ferrosilicon is 5%; the mass percentage of mixed rare earth The percentage content is 4%; the mass percentage content of ferromolybdenum (same as before) is 1%; the balance of reduced iron powder. The composition of mixed rare earth powde...

Embodiment 3

[0045] Embodiment 3. A 314 stainless steel strip of 10×0.4 (width 10 mm, thickness 0.4 mm) is selected, and the filling rate is 26.5%. After drawing and reducing the diameter, a welding wire with a diameter of 1.6 mm is obtained.

[0046] The mass percentage of rutile is 24%; the mass percentage of marble is 3%; the mass percentage of feldspar is 4%; the mass percentage of fluorite is 4%; the mass percentage of quartz is 4% %; the mass percentage of bismuth oxide is 0.3%; the mass percentage of aluminum oxide is 3%; the mass percentage of magnesia is 3%. The mass percentage of metal chromium powder is 20%; the mass percentage of metal nickel is 18%; the mass percentage of electrolytic manganese metal is 3%; the mass percentage of No. 45 ferrosilicon is 2%; the mass percentage of mixed rare earth The percentage content is 3%; the mass percentage content of ferromolybdenum is 5%; the balance of reduced iron powder. The composition of mixed rare earth powder is: La 2 o 3 :30%...

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Abstract

A gas-shielded mineral powder type 314 heat-resistant stainless steel flux-cored welding wire belongs to the field of material processing engineering and is mainly used for welding 314 heat-resistant stainless steel. The commonly used 314 stainless steel strip is used as the cladding layer, and the mass percentages of the alloy components in the powder core are: rutile: 18%-24%; marble: 3%-5%; feldspar: 3%-5%; fluorite 4% -6%; Quartz 4% -6%; Bismuth Oxide 0% -0.3%; Aluminum Oxide 3% -5%; Magnesia 2% -3%. Metal chromium powder 20%-25%, metal nickel 18%-25%, electrolytic metal manganese 3%-5%, No. 45 ferrosilicon 2%-5%, mixed rare earth 3%-5%, molybdenum iron 0%-10% %, the balance is reduced iron powder (can be 0 or used to make up 100%). The filling rate of mixed flux cored wire is 24-28%. The welded joint has excellent crack resistance and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of flux-cored welding wires, and in particular relates to a 314 heat-resistant stainless steel mineral powder-type flux-cored welding wire for gas shielded welding, which is mainly used for welding 314 heat-resistant stainless steel. Background technique [0002] 314 stainless steel belongs to austenitic stainless steel, and the corresponding domestic standard grade is 1Cr25Ni20Si2. It is a high-pressure heat-resistant stainless steel with good high temperature resistance, strong oxidation resistance, creep resistance and excellent mechanical properties. 314 stainless steel can maintain its excellent performance during intermittent use below 1500°C and continuous use below 1200°C, and the best use effect is in the range of 1150-1300°C. At present, 314 stainless steel is mainly used in industries such as high-temperature furnace tubes and blast furnaces in steel mills. [0003] 314 stainless steel has a pure austenit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/12B23K35/30
CPCB23K35/0266B23K35/3053
Inventor 李国栋孔维栗卓新符寒光孟晓亮
Owner BEIJING UNIV OF TECH
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