314 heat-resistant stainless steel metal-cored welding wire

A heat-resistant stainless steel and metal core technology, applied in the welding of 314 heat-resistant stainless steel, 314 heat-resistant stainless steel metal core welding wire, can solve the problem of high temperature resistance, oxidation resistance, high temperature creep resistance, failure to meet service conditions, Insufficient content of alloying elements, etc., to achieve excellent high temperature resistance and crack resistance, convenient and efficient mass production, and excellent wire process performance

Active Publication Date: 2019-06-25
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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
[0006] At present, because there is no special 314 stainless steel welding material, sometimes 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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  • 314 heat-resistant stainless steel metal-cored welding wire
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  • 314 heat-resistant stainless steel metal-cored welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1. A 304 stainless steel strip of 8×0.3 (8mm in width and 0.3mm in thickness) is selected, and the filling rate is 35%. After drawing and reducing the diameter, a welding wire with a diameter of 1.2 mm is obtained.

[0028] The mass percent of each alloy composition in the powder core is: the mass percent of chromium is 44%, the mass percent of nickel is 47%, the mass percent of medium manganese is 1%, the mass percent of No. 75 ferrosilicon is 4%, mix The mass percentage of rare earth is 4%. The composition of mixed rare earth powder is: La 2 o 3 :30%, CeO 2 :48%,Pr 2 o 3 :6%,Nd 2 o 3 : 16%. The welding current used during welding is 50A, and the welding voltage is 22V. The welding shielding gas is pure argon, and the shielding gas flow rate is 10L / min.

Embodiment 2

[0029] Embodiment 2. 304 stainless steel strips of 8×0.4 (8mm in width and 0.4mm in thickness) are selected, and the filling rate is 32%. After drawing and reducing the diameter, a welding wire with a diameter of 1.6 mm is obtained.

[0030] The mass percentage of each alloy composition in the powder core is: the mass percentage of chromium is 40%, the mass percentage of nickel is 48%, the mass percentage of medium manganese is 2%, and the mass percentage of No. 75 ferrosilicon is 6%. The mass percentage of rare earth is 4%. The composition of mixed rare earth powder is: La 2 o 3:31%, CeO 2 :47%,Pr 2 o 3 :6%,Nd 2 o 3 : 16%. The welding current used during welding is 100A, and the welding voltage is 25V. The welding shielding gas is pure argon, and the shielding gas flow rate is 15L / min.

Embodiment 3

[0031] Embodiment 3. A 304 stainless steel strip of 10×0.4 (10 mm in width and 0.4 mm in thickness) is selected, and the filling rate is 32%. After drawing and reducing the diameter, a welding wire with a diameter of 2.0 mm is obtained.

[0032] The mass percent of each alloy composition in the powder core is: the mass percent of chromium is 34%, the mass percent of nickel is 53%, the mass percent of medium manganese is 4%, the mass percent of No. 75 ferrosilicon is 4%, mix The mass percentage of rare earth is 5%. The composition of mixed rare earth powder is: La 2 o 3 :31%, CeO 2 :47%,Pr 2 o 3 :5%,Nd 2 o 3 :17%. The welding current used during welding is 150A, and the welding voltage is 26V. The welding shielding gas is pure argon, and the shielding gas flow rate is 20L / min.

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Abstract

The invention discloses a 314 heat-resistant stainless steel metal-cored welding wire, and belongs to the field of metal-cored welding wires. The 314 heat-resistant stainless steel metal-cored weldingwire adopts a 304 or 310 stainless steel strip as a coating layer, and comprises metal chromium powder, metal nickel powder, mid-carbon ferromanganese powder, 75# ferrosilicon powder, mixed rare-earth powder and the balance of reduced iron powder. Deposited metal of the 314 heat-resistant stainless steel metal-cored welding wire consists of the following chemical components in percentage by mass:0.06-0.15% of C, 1.5-2.0% of Si, 0.5-2.5% of Mn, less than or equal to 0.030% of S, less than or equal to 0.030% of P, 23-25% of Cr, 19-22% of Ni, 1.0-2.0% of RE and the balance of Fe. A welding joint prepared from the welding wire has more excellent performance.

Description

technical field [0001] The invention belongs to the field of metal-cored welding wire, in particular to a 314 heat-resistant stainless steel metal-cored welding wire, 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 mechanical properties - and so on. 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. [0003] 314 stainless steel has a pure austenitic structure, and the working conditions are harsh and the service temperature is high. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
Inventor 李国栋孔维周航孟晓亮
Owner BEIJING UNIV OF TECH
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