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A kind of welding wire and welding method for high manganese low temperature steel submerged arc welding

A technology of submerged arc welding and welding method, which is applied in the direction of welding/welding/cutting items, welding equipment, welding medium, etc., which can solve the problems of difficult use, toxic manganese, volatilization, etc., to reduce alloy cost and improve low-temperature impact performance, stability improvements

Active Publication Date: 2020-12-18
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These high-manganese welding consumables have the obvious advantage of low alloy cost, but due to the high-content manganese element is easy to form toxic manganese volatilization during the welding process, special welding equipment is required, and it is difficult to use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A welding wire for submerged arc welding of high manganese and low temperature steel provided in this example, its chemical composition and mass percentage are as follows: C: 0.29%, Mn: 14.1%, Ni: 17%, Cr: 3.1%, P≤0.004 %, S≤0.002%, the balance is Fe and unavoidable impurities.

[0024] The welding method is as follows: the diameter of the welding wire used is 2.4mm, the submerged arc welding method is adopted, and the high-manganese low-temperature steel plate with a thickness of 21mm and a Mn content of 23.8% is welded. The groove of the high-manganese low-temperature steel plate is V-shaped, the groove angle on one side is 30°C, the flux is INCOFLUX9 (SMC), the welding current is 410A, the arc voltage is 27V, the welding speed is 34cm / min, and the welding heat input is 18kJ / cm.

[0025] Charpy Pendulum Impact Test (National Standard GB / T229--2007) Impact Absorption Energy KV of V-shaped Sample of Weld Metal Formed by Welding Wire 2 It is 69J, the microstructure of...

Embodiment 2

[0027]A welding wire for submerged arc welding of high manganese and low temperature steel provided in this example, its chemical composition and mass percentage are as follows: C: 0.2%, Mn: 15%, Ni: 16%, Cr: 5%, P≤0.004 %, S≤0.002%, the balance is Fe and unavoidable impurities.

[0028] The welding method is as follows: the diameter of the welding wire used is 4 mm, and the submerged arc welding method is used to weld high-manganese low-temperature steel plates with a thickness of 18 mm and a Mn content of 24% by mass. The groove of the high-manganese low-temperature steel plate is V-shaped, the groove angle on one side is 30°C, the flux is INCOFLUX9 (SMC), the welding current is 550A, the arc voltage is 30V, the welding speed is 51cm / min, and the welding heat input is 19kJ / cm.

[0029] Charpy Pendulum Impact Test (National Standard GB / T229--2007) Impact Absorption Energy KV of V-shaped Sample of Weld Metal Formed by Welding Wire 2 It is 46J, and the microstructure of the ...

Embodiment 3

[0031] A welding wire for submerged arc welding of high manganese and low temperature steel provided in this example, its chemical composition and mass percentage are as follows: C: 0.4%, Mn: 12%, Ni: 20%, Cr: 2%, P≤0.004 %, S≤0.002%, the balance is Fe and unavoidable impurities.

[0032] The welding method is as follows: the diameter of the welding wire used is 2.4mm, and the submerged arc welding method is used to weld high-manganese low-temperature steel plates with a thickness of 25mm and a Mn content of 22.5%. The groove of the high-manganese low-temperature steel plate is V-shaped, the angle of the groove on one side is 30°C, the flux is INCOFLUX9 (SMC), the welding current is 430A, the arc voltage is 30V, the welding speed is 37cm / min, and the welding heat input is 21kJ / cm .

[0033] Charpy pendulum impact test (national standard GB / T229--2007) impact absorption energy KV of V-shaped sample formed by welding wire -196°C 2 It is 77J, the microstructure of the weld meta...

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Abstract

The invention discloses a welding wire and a welding method for submerged arc welding of high-manganese and low-temperature steel, and relates to the field of welding technology. Its chemical composition and mass percentage are as follows: C: 0.2%-0.4%, Mn: 12%-15%, Ni: 16%~20%, Cr: 2%~5%, P≤0.004%, S≤0.002%, W: 2%~4%, Mo: 0.1%~1.2%, Ti: 0.01%~0.2%, Nb: 0.01% to 0.2%, N: 0.02% to 0.1%, and the balance is Fe and unavoidable impurities. The manganese-nickel composition design adopted in the present invention has good compatibility with the high-manganese low-temperature steel base material, and the composition is simple, which is suitable for the conventional welding wire manufacturing method, and the weld metal formed by the welding wire is at a low temperature of -196°C It has excellent impact toughness and satisfies the welding requirements of high-manganese low-temperature steel used in the construction of liquefied natural gas storage tanks and other equipment.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding wire for submerged arc welding of high manganese and low temperature steel and a welding method. Background technique [0002] The storage and transportation of liquefied natural gas (boiling point -162°C), liquid oxygen (boiling point -183°C) and liquid nitrogen (boiling point -196°C) require structural materials that serve under low temperature conditions. The main mechanical property requirements are low temperature Has sufficient impact toughness. As commonly used low-temperature steel, materials such as 9% Ni steel and Cr-Ni austenitic stainless steel need to add a large amount of expensive nickel element, so the cost is high. In recent years, high-manganese low-temperature steel has received widespread attention as a cutting-edge new low-temperature material, and the development of its special matching welding consumables is also extremely important. [0003] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K9/18B23K103/04
CPCB23K9/186B23K35/0261B23K35/3066B23K35/30C22C38/58C22C38/44C22C38/50C22C38/48C22C38/001
Inventor 孙超李东晖尹雨群
Owner NANJING IRON & STEEL CO LTD
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