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Solid core wire for gas protection welding of high manganese low temperature steel

A technology of gas shielded welding and solid welding wire, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of high cost, high content and volatile, etc., and achieves improved performance, simple composition, and reduced Effect of expensive element content and alloy cost

Active Publication Date: 2019-04-16
NANJING IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the deficiencies in the prior art, comprehensively consider the high cost of Ni and the volatile problems of high-content Mo, and provide a low-cost, easy-to-use solid core wire for gas shielded welding of high-manganese low-temperature steel. The composition design of the welding wire makes the weld metal formed by the welding wire have excellent low-temperature impact toughness, which meets the welding requirements of high-manganese steel and low-temperature steel used in the construction of liquefied natural gas storage tanks and other equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A solid core wire for gas shielded welding of high manganese low temperature steel, the chemical composition and mass percentage are: 0.33% C, 13% Mn, 16.2% Ni, 3.1% Cr, 0.1% Mo, 0.017% Ti, P≤0.004%, S≤0.002%, the balance is Fe and other unavoidable impurity elements.

[0020] The diameter of the solid welding wire described in this embodiment is 2.4mm, and the high-manganese low-temperature steel plate with a thickness of 17.5mm and a Mn content of 24% is welded by a tungsten inert gas shielded welding method. The groove of the steel plate is V-shaped, the groove angle is 60°, the shielding gas is 99.9% Ar gas, the welding current is 145~160A, the arc voltage is 11~13V, the welding speed is 7~15cm / min, and the welding heat input It is 6.8~17.7kJ / cm.

[0021] -196°C Charpy pendulum impact test (national standard GB / T229--2007) impact absorption energy KV of the weld metal formed by the solid welding wire described in this example 2 It is 53J, and the microstructure of...

Embodiment 2

[0023] A solid wire for gas shielded welding of high-manganese low-temperature steel, the chemical composition and mass percentage are: 0.2% C, 15% Mn, 18% Ni, 1.5% Cr, 0.27% Mo, 0.040% Ti, P≤0.004%, S≤0.002%, the balance is Fe and other unavoidable impurity elements.

[0024] Present embodiment except chemical composition, all the other are the same as embodiment 1. -196°C Charpy pendulum impact test (national standard GB / T229--2007) impact absorption energy KV of the weld metal formed by the solid welding wire 2 It is 67J, the microstructure of the weld metal is austenite, and there is no solidification crack and reheat crack.

Embodiment 3

[0026] A solid wire for gas shielded welding of high-manganese low-temperature steel, the chemical composition and mass percentage are: 0.4% C, 12% Mn, 14% Ni, 4.5% Cr, 0.6% Mo, 0.005% Ti, P≤0.004%, S≤0.002%, the rest is Fe and other unavoidable impurity elements.

[0027] Present embodiment except chemical composition, all the other are the same as embodiment 1. -196°C Charpy pendulum impact test (national standard GB / T229--2007) impact absorption energy KV of the weld metal formed by the solid welding wire 2 It is 41J, and the microstructure of the weld metal is austenite, and there are no solidification cracks and reheat cracks.

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Abstract

The invention discloses a solid core wire for gas protection welding of high manganese low temperature steel. The solid core wire is characterized by comprising the following chemical composition in percentage by mass: 0.2-0.4% of C, 12-15% of Mn, 14-18% of Ni, 1.5-4.5% of Cr, 0.1-0.6% of Mo, 0.005-0.040% of Ti, no more than 0.004% of P, no more than 0.002% of S and the balance Fe and inevitable impurity elements. The solid core wire adopts the alloy design of composite manganese and nickel adding, the content of expensive elements such as nickel and the cost of alloy are reduced, the fact that the excessive amount of manganese forms excessive toxic manganese evaporation in the welding process is avoided, the use performance of the wire is improved, the weld metal formed by the solid corewire at low temperature of minus 196 DEG C has excellent impact toughness, and the welding requirements of the high manganese low temperature steel for the construction of liquefied natural gas storage tanks and other equipment are well met.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a solid core welding wire used for gas shielded welding of high manganese and low temperature steel. 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 very 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 imp...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3073B23K35/40
Inventor 孙超王红鸿李东晖赵柏杰
Owner NANJING IRON & STEEL CO LTD
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