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Nickel-based alloy wire for welding of LNG storage tank as well as preparation method and welding process

A technology of nickel-based alloy and welding process, which is applied in the field of preparation of nickel-based alloy welding wire, which can solve the problems of decreased plasticity and toughness of welding wire, failure of welding wire to meet production requirements, increase of hardness and strength, etc., to improve drawing accuracy and avoid hydrogen Embrittlement and internal stress generation, and the effect of improving low-temperature impact toughness reduction

Inactive Publication Date: 2019-11-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The nickel-based alloy welding wire used for LNG storage tank welding is prone to work hardening during the multi-pass drawing process, which reduces the plasticity and toughness of the welding wire, increases its hardness and strength, and causes the welding wire to be pulled during the drawing process. broken and unable to meet production requirements

Method used

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  • Nickel-based alloy wire for welding of LNG storage tank as well as preparation method and welding process
  • Nickel-based alloy wire for welding of LNG storage tank as well as preparation method and welding process
  • Nickel-based alloy wire for welding of LNG storage tank as well as preparation method and welding process

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Experimental program
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Effect test

preparation example Construction

[0025] A preparation method for a nickel-based alloy welding wire for LNG storage tank welding, the steps of which are:

[0026] A. Alloy smelting, batching is carried out according to the above components, the raw materials are put into a vacuum induction furnace for smelting, and cast into electrode rods;

[0027] B. Electroslag remelting, using the existing atmosphere-protected electroslag remelting furnace, the surface of the electrode rod is polished and inserted into the slag as a consumable electrode. The electroslag remelting process is protected by argon gas, and the heavy The composition of the slag material is SiO 2 : 1%, Al 2 o 3 : 22%, FeO: 0.1%, TiO 2 : 3%, MgO: 5%, CaF 2 : 48%, CaO: 20%, current 2100~2300A, steel ingot capping and feeding current 0~1500A, capping time 3~5min, power off and cooling for 5~10min, take off the ingot, cool to room temperature in the air, and get nickel-based alloy ingot , and use a lathe to remove the scale on the surface of the...

Embodiment 1

[0042] In this embodiment, the welding wire (φ1.6mm) is selected to weld the 06Ni9DR steel test plate by automatic submerged arc welding. The size of the base metal is 300mm×150mm×25mm, V-shaped groove is adopted, and the opening angle is 55°; welding current: 370A , Welding voltage: 28V, welding speed: 58mm / min, current type: AC, welding line energy should be controlled below 45KJ / cm, and interlayer temperature should be controlled below 100°C. After the 06Ni9DR steel test plate is welded, the sample processing and mechanical properties are tested according to the requirements in GB / T13814. The tensile properties are shown in Table 1:

[0043] Table 1:

[0044]

[0045] It can be seen from the above table that when welding at room temperature, the deposited metal of this welding wire has a high tensile strength, which meets the requirements for the performance of the weld deposited metal of the LNG storage tank material 06Ni9DR steel. At the same time, it has a good elong...

Embodiment 2

[0055] The microstructure of the welding wire weld metal in this embodiment is as follows: image 3 As shown in the figure, it can be seen that the appearance of the weld obtained by automatic submerged arc welding multi-layer and multi-pass welding is good, the width is consistent, the weld metal is well fused with the base metal, and there are no welding cracks, pores, slag inclusions, and no fusion after welding. and other defects. Inspection standard EN970, using visual inspection and welding inspection ruler, the inspection results are shown in Table 4:

[0056] Table 4:

[0057]

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Abstract

The invention relates to a nickel-based alloy wire for welding of an LNG storage tank as well as a preparation method and a welding process. The nickel-based alloy wire comprises the following components in percentage by mass: 20.0%-23.0% of Cr, 0.0%-10.0% of Mo, 3.15%-4.15% of Nb, not more than 5.0% of Fe, not more than 1.0% of Co, not more than 0.50% of Mn, not more than 0.40% of Al, not more than 0.40% of Ti, not more than 0.50% of Si, not more than 0.10% of C, not more than 0.015% of S and the balance of Ni. The preparation method comprises the following steps of A, alloy smelting and casting into electrode rods; B, electroslag remelting; C, hammer cogging; D, hot roll annealing; E, acid pickling and grinding; F, drawing; G, dehydrogenation and straightening after hydrogen annealing treatment; and H, winding to be disc-like. The welding process is that the welding current is 360-380 A, the voltage is 26-28 V, and the welding speed is 50-100 cm / min and the current type is alternating current.

Description

technical field [0001] The invention relates to the preparation technology of nickel base alloy welding wire. Background technique [0002] Liquefied Natural Gas (LNG, Liquefied Natural Gas) is becoming more and more popular as a clean energy source, and its proportion in energy supply is increasing rapidly, and it is becoming a new hot spot in the world's oil and gas industry. With the adjustment of my country's energy strategic layout and the country's growing demand for energy, liquefied natural gas has become an increasingly important energy source in my country. As a professional product for storing and transporting liquefied natural gas, LNG storage tanks effectively solve the problems of energy supply security and ecological environment protection, and achieve sustainable economic and social development. [0003] When 06Ni9DR steel is used to manufacture LNG storage tanks, it can not only improve the reliability of the overall structure of the storage tank, but also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/304B23K35/40
Inventor 刘德学王文旭南宏强高源崔毛毛
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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