Welding wire for X80 steel low-temperature resistant steel pipe and pipe fittings

A technology of low temperature resistance, steel pipe, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of low temperature resistance and toughness decrease, and achieve the effect of high and low temperature impact toughness

Inactive Publication Date: 2012-01-04
CNPC BOHAI EQUIP MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when domestic pipeline steel welds are exposed to ambient temperatures exceeding -35°C, the mechanical properties of the welds, especially the low temperature toughness, are significantly reduced.

Method used

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  • Welding wire for X80 steel low-temperature resistant steel pipe and pipe fittings
  • Welding wire for X80 steel low-temperature resistant steel pipe and pipe fittings
  • Welding wire for X80 steel low-temperature resistant steel pipe and pipe fittings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The chemical composition and content (percentage by weight) of the welding wire in this embodiment are shown in Table 1. According to the chemical composition shown in Table 1, the metal wire rod is cold-drawn and sized to form an automatic welding wire with a diameter of φ4.0mm.

[0014] Table 1 Chemical composition list of welding wire

[0015] C Si mn P S Ni 0.07% 0.10% 0.9% 0.012% 0.008% 3.6% Cr V Mo Ti B Fe 0.02% 0.005% 0 0.008% 0.0008% margin

[0016] Use the welding wire of this embodiment to weld the steel pipe with a diameter of φ1016×22, ​​the welding current is 450-550A, the arc voltage is 28-32V, and the weld performance after welding is tested. The test results are shown in Table 2.

[0017] Table 2 Performance test results

[0018]

Embodiment 2

[0020] The chemical composition and content (percentage by weight) of the welding wire in this embodiment are shown in Table 3. According to the chemical composition shown in Table 3, the metal wire rod is cold-drawn and sized to form an automatic welding wire with a diameter of φ3.2mm.

[0021]

[0022] Table 3 Chemical Composition of Welding Wire

[0023] C Si mn P S Ni 0.09% 0.15% 1.2% 0.009% 0.006% 2.5% Cr V Mo Ti B Fe 0 0.005% 0.10% 0.01% 0.0004% margin

[0024] Use the welding wire of this embodiment to weld the steel pipe with a diameter of φ1016×22. The welding current is 450-550A and the arc voltage is 28-32V. The performance of the weld seam after welding is tested. The test results are shown in Table 4.

[0025] Table 4 Performance test results

[0026]

Embodiment 3

[0028] The chemical composition and content (percentage by weight) of the welding wire in this embodiment are shown in Table 5. According to the chemical composition shown in Table 5, the metal wire rod is cold-drawn and sized to form an automatic welding wire with a diameter of φ4.2mm.

[0029] Table 5 Chemical Composition of Welding Wire

[0030] C Si mn P S Ni 0.08% 0.20% 1.5% 0.016% 0.006% 2.8% Cr V Mo Ti B Fe 0.10% 0.01% 0.20% 0 0.001% margin

[0031] Use the welding wire of this embodiment to weld the steel pipe with a diameter of φ1016×22, ​​the welding current is 450-550A, the arc voltage is 28-32V, and the performance of the weld seam after welding is tested. The test results are shown in Table 6.

[0032] Table 6 Performance test results

[0033]

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Abstract

The invention discloses a welding wire for an X80 steel low-temperature resistant steel pipe and pipe fittings. The welding wire consists of the following elements in percentage by weight: 0.06 to 0.10 percent of C, 0.10 to 0.35 percent of Si, 0.9 to 1.5 percent of Mn, less than or equal to 0.016 percent of P, less than or equal to 0.010 percent of S, 2.5 to 3.6 percent of Ni, 0 to 0.50 percent of Mo, 0 to 0.1 percent of Cr, 0 to 0.30 percent of Cu, 0 to 0.10 percent of V, 0 to 0.01 percent of Ti, 0 to 0.001 percent of B and the balance of Fe. The welding wire is formed by the cold-drawing and sizing of a metal wire rod, and is subjected to chemical copper plating or copper electroplating. The tensile strength of a weld joint of the steel pipe or the pipe fittings made of the welding wire is more than 625 MPa, and an average value of the low-temperature impact toughness of the weld joint and a welding heat affected area at the temperature of -45 DEG C is more than 75 J, so the welding wire is suitable for welding the X80 steel pipe or the pipe fittings for petroleum and natural gas transportation pipelines in a high-cold zone completely.

Description

technical field [0001] The invention relates to a welding wire, in particular to a welding wire for X80 steel low-temperature resistant steel pipes and pipe fittings. Background technique [0002] With the development of oil, natural gas and other resources in alpine regions, various oil and gas pipelines have been started one after another, and the requirements for steel pipes are also increasing. Through research, we found that the lowest operating temperature of the second-line West-East Gas Pipeline Project and the China-Russia Crude Oil Pipeline Project can reach -45°C, and many pipeline steel pipes, elbows, and station fittings are exposed to cold external environments. In the future, a large number of pipelines will be built in alpine regions, and the requirements for welding performance of low-temperature resistant steel pipes and fittings will be greatly improved. Therefore, the development of special welding wire for low temperature resistant pipeline steel has a ...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 付彦宏彭立山李志华徐强廖淑梅刘旭
Owner CNPC BOHAI EQUIP MFG
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