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X80 pipeline steel submerged arc welding wire

A technology of pipeline steel and welding wire, applied in arc welding equipment, welding medium, welding equipment, etc., can solve the problem that X80 steel is not suitable

Inactive Publication Date: 2008-09-03
CNPC BOHAI EQUIP MFG +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical composition of the welding wire of the Chinese patent of 92105621.4 is: C0.03~0.10%, Mn1.2~1.6%, Mo0.2~0.4%, Ti 0.02~0.08%, B0.001~0.008%, which belongs to the MnMoTiB alloy system Submerged arc welding wire, not applicable to X80 steel

Method used

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  • X80 pipeline steel submerged arc welding wire
  • X80 pipeline steel submerged arc welding wire
  • X80 pipeline steel submerged arc welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical composition of the welding wire in this embodiment is shown in Table 1. The actual chemical composition and standard composition of the X80 and 22mm steel plates used for welding X80 and Φ1219×22mm LSAW pipes are shown in Table 2, the composition of the flux is shown in Table 3, and the welding process parameters are shown in Table 4. Table 5 shows the analysis results of the chemical composition of the weld, and Tables 6, 7, and 8 show the performance test results of the steel pipes. It can be seen from the table that the weld seam and heat-affected zone quality of X80 high-strength and high-toughness Φ1219×22mm longitudinal submerged arc welded pipe can meet the technical requirements of high strength, high toughness, bending and low hardness of welded steel pipe for oil and gas transportation. In particular, it can meet the technical standard requirements for submerged arc welded pipes used in the natural gas pipeline project of the Second West-East Gas ...

Embodiment 2

[0043] The chemical composition of the welding wire of this embodiment is shown in Table 9. The actual chemical composition and standard composition of the X80 steel plate used for welding X80 and Φ1219×26.4mm LSAW pipes are shown in Table 10, the composition of the flux is shown in Table 11, and the welding process parameters are shown in Table 12. Table 13 shows the analysis results of the chemical composition of the weld, and Tables 14, 15, and 16 show the performance test results of the steel pipes. It can be seen from the table that the weld seam and heat-affected zone quality of X80 high-strength and high-toughness Φ1219×26.4mm LSAW pipe can meet the technical requirements for high strength, high toughness, bending and low hardness of welded steel pipe for oil and gas transportation. In particular, it can meet the technical standard requirements for submerged arc welded pipes used in the natural gas pipeline project of the Second West-East Gas Pipeline Project, which fil...

Embodiment 3

[0061] The chemical composition of the welding wire of this embodiment is shown in Table 17. The actual chemical composition and standard composition of the X80 steel plate used for welding X80 and Φ1219×33mm LSAW pipes are shown in Table 18, the composition of the flux is shown in Table 19, and the welding process parameters are shown in Table 20. Table 21 shows the chemical composition analysis results of the weld, and Tables 22, 23, and 24 show the performance test results of the steel pipes. It can be seen from the table that the weld seam and heat-affected zone quality of X80 high-strength and high-toughness Φ1219×33mm LSAW pipe can meet the technical requirements for high strength, high toughness, bending and low hardness of welded steel pipe for oil and gas transportation. In particular, it can meet the technical standard requirements for submerged arc welded pipes used in the natural gas pipeline project of the Second West-East Gas Pipeline Project, which fills the gap...

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Abstract

The invention discloses a steel welding wire of submerged arc welding for X80 pipeline, which is used for submerged arc welding for welding steel with high strength and high toughness for X80 pipeline for transporting petroleum and gas. The welding wire contains following chemical components (by weight percentage): C 0.06 to 0.10%, Mn 1.5 to 1.8%, Si 0.25 to 0.35%, P less than or equal to 0.016%, S less than or equal to 0.005%, Mo 0.3 to 0.4%, Cu less than or equal to 0.08%, Ti 0.1 to 0.2%, B 0.004 to 0.008%, N less than or equal to 0.006%, H less than or equal to 0.003%, and O less than or equal to 0.003%. The welding wire can be used for welding X80 submerged arc welded pipes with high strength and high toughness, and the quality of the welding seam and a heat affected zone can meet the technical requirements of welded steel pipes for petroleum and gas transportation such as high strength, high roughness and low rigidity, and particularly can meet the technical standard requirement for submerged arc welded pipes for two gas pipelines of the worldwide-focused engineering for transporting natural gas from west to east.

Description

technical field [0001] The invention relates to a welding wire, in particular to a welding wire for submerged arc welding of an X80 high-strength and high-toughness welded pipe used for oil and gas pipelines. Background technique [0002] Pipeline transportation is the most reasonable transportation method for long-distance transportation of oil and gas. It has the remarkable characteristics of economy, safety, high efficiency, energy saving, uninterrupted, and less damage to the environment. Therefore, all countries in the world attach great importance to the development of pipeline transportation technology, and many countries spare no effort to spend a lot of financial and material resources to vigorously develop the pipeline transportation industry. Pipeline transportation has become the fifth largest transportation industry after road, railway, waterway and air transportation. [0003] The development trend of pipeline construction is to develop towards long distance, ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K9/18
Inventor 李延丰任景辉王旭申立群张远生曾志超明廷泽郑海
Owner CNPC BOHAI EQUIP MFG
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