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X80 pipeline steel submerged arc welding flux-cored wire with excellent low temperature performance and preparation method thereof

A low-temperature performance, flux-cored wire technology, applied in welding equipment, welding/welding/cutting items, welding media, etc., can solve the problems of unsightly weld seams and low toughness of welded pipes

Inactive Publication Date: 2019-10-29
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a X80 pipeline steel submerged arc welding flux-cored wire with excellent low-temperature performance, which solves the problems that the existing X80 pipeline steel submerged arc welding flux-cored wire has low toughness and unsightly welded seam

Method used

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  • X80 pipeline steel submerged arc welding flux-cored wire with excellent low temperature performance and preparation method thereof

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preparation example Construction

[0023] A kind of X80 pipeline steel submerged arc welding flux-cored welding wire preparation method of the present invention, specifically comprises the following steps:

[0024] Step 1, mix the flux core powder of the flux cored wire and mix evenly. The flux core powder includes the following components according to the mass percentage: manganese 1.3%-2.6%, silicon 0.1%-0.3%, molybdenum 0.3%-0.5%, nickel 1.1% %-1.5%, boron 0.005%-0.01%, copper 0.01%-0.04%, titanium 0.003%-0.008%, cerium oxide 0.1%-0.25%, the rest is iron powder, the sum of the mass percentage of the above components is 100% .

[0025] Step 2: Mix the drug core powder weighed in step 1 evenly, wrap it with a low-carbon steel strip with a width of 30mm and a thickness of 0.5mm, close the strip with a molding machine, wipe it clean with alcohol, and then pull it out. to flux-cored wires with a diameter of 3.2mm or 4mm.

[0026] Welding conditions when using the prepared flux-cored wire to weld X80 pipeline st...

Embodiment 1

[0037] Step 1: Prepare flux-cored welding wire according to the following mass percentages: 1.3% manganese, 0.3% silicon, 0.4% molybdenum, 1.1% nickel, 0.006% boron, 0.025% copper, 0.004% titanium, 0.1% cerium oxide, and the rest is iron powder , the sum of the mass percentages of the above components is 100%;

[0038] Step 2: Select a low-carbon steel strip with a width of 30mm and a thickness of 0.5mm to wrap the drug core powder, and close the low-carbon steel strip with a molding machine, wipe it clean with alcohol, and then pull it to a diameter of 3.2mm.

[0039] The flux cored wire prepared in Example 1 was used for submerged arc welding (SAW). The welding conditions are: welding current is 750A, welding voltage is 36V, welding wire extension length is 28mm, submerged arc flux is SJ101G3.

[0040] After testing, the impact energy at -45°C is 110J, and the mass percentage of cladding metal elements in the prepared welded joints is shown in Table 1.

Embodiment 2

[0042] Step 1: Prepare flux-cored welding wire according to the following mass percentages: manganese 2.0%, silicon 0.1%, molybdenum 0.3%, nickel 1.2%, boron 0.007%, copper 0.01%, titanium 0.005%, cerium oxide 0.2%, and the rest is iron powder , the sum of the mass percentages of the above components is 100%;

[0043] Step 2: Select a low-carbon steel strip with a width of 30mm and a thickness of 0.5mm to wrap the drug core powder, and close the low-carbon steel strip with a molding machine, wipe it clean with alcohol, and then pull it to a diameter of 3.2mm.

[0044] The flux-cored welding wire prepared in Example 2 was used for submerged arc welding (SAW). Welding conditions are: welding current is 680A, welding voltage is 38V, welding wire extension length is 28mm, submerged arc flux is SJ101G3.

[0045] After testing, the impact energy at -45°C is 105J, and the mass percentage of cladding metal elements in the prepared welded joints is shown in Table 1.

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Abstract

The invention discloses an X80 pipeline steel submerged arc welding flux-cored wire with excellent low temperature performance and a preparation method thereof. The flux-cored wire comprises a flux core and a welding skin, wherein the flux core consists of the following components in percentage by mass: 1.3-2.6% of manganese, 0.1-0.3% of silicon, 0.3-0.5% of molybdenum, 1.1-1.5% of nickel, 0.005-0.01% of boron, 0.01-0.04% of copper, 0.003-0.008% of titanium, 0.1-0.25% of cerium dioxide, and the balance iron; and the sum of the abovementioned components in percentage by mass is 100%. The flux-cored wire has the beneficial effects that: Ni, Mn, Mo and other elements are added through proportioning control to obtain a welded joint deposited metal component similar to an X80 pipeline steel base material; the surface of a welding line is smooth and clean, has metallic luster, and is free from air holes and slag inclusion; and moreover, the impact power Akv-45DEG C under the temperature of -45 DEG C is not less than 105J, so that the working condition under the temperature of -45 DEG C applies.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored wire for submerged arc welding of X80 pipeline steel with excellent low-temperature performance, and also relates to a preparation method of the wire. Background technique [0002] X80 pipeline steel is a super steel with micron grain size. The chemical composition of the steel is: C≤0.22%, Si≤0.40%, Mn≤1.85%, P≤0.030%, S≤0.018%, (Nb+V +Ti)≤0.5%, which is obtained through multi-step metallurgical new technologies such as molten iron pretreatment, converter refining, ladle metallurgy and continuous casting, and controlled rolling and controlled cooling (TMCP) rolling method. It has ultra-cleanness, ultra-uniformity and ultra- The characteristics of fine-grained structure. [0003] X80 pipeline steel is characterized by ultra-low carbon acicular ferrite. The design of welding wire composition generally adopts low-carbon (C<0.06%) Mn-Ni-Mo-Ti-B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40B23K103/04
CPCB23K35/0266B23K35/3073B23K35/406B23K2103/04
Inventor 张敏仝雄伟李洁贾芳许帅
Owner XIAN UNIV OF TECH
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