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High-toughness high-welding speed sintered flux suitable for submerged-arc welding of X90/X100 ultrahigh-strength pipeline steel pipe

An ultra-high-strength, sintered flux technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems that cannot meet the weld performance and process requirements, and achieve high toughness, smooth weld surface, good transition effect

Active Publication Date: 2013-07-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the X80 flux used at this stage is far from meeting the performance and process requirements of the weld, so it is necessary to develop X90 / X100 sintered flux for ultra-high-strength pipeline steel

Method used

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  • High-toughness high-welding speed sintered flux suitable for submerged-arc welding of X90/X100 ultrahigh-strength pipeline steel pipe
  • High-toughness high-welding speed sintered flux suitable for submerged-arc welding of X90/X100 ultrahigh-strength pipeline steel pipe
  • High-toughness high-welding speed sintered flux suitable for submerged-arc welding of X90/X100 ultrahigh-strength pipeline steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Flux composition (wt%): MgO 21.5, CaF 2 20.1, Al 2 o 3 20.8, CaO6.2, rare earth 5.3, MnO6.5, SiO 2 26.5, S0.014, P0.029, add deoxidizer Si-Fe1~2, Mn-Fe3~4;

[0026] 2) Dry mix the raw materials containing certain ingredients according to a certain ratio, and after stirring evenly, add an appropriate amount of adhesive (potassium sodium water glass) according to a certain percentage of the total mass of the mixture for wet mixing, and then use a dustpan or make According to GB / T 12470-2003 "Welding wire and flux for low alloy steel for submerged arc welding", the particle size of the flux is controlled between 10-60 mesh, and then dried at 200-250°C at low temperature , and then sintered at a high temperature of 800-900 ° C, and then packed in a moisture-proof packaging bag after being screened with 10-60 mesh.

[0027] 3) Mechanical properties of weld deposited metal test

[0028]

[0029] 4) Welding test and performance test (with high steel grade welding wire...

example 2

[0032] 1) Flux composition (wt%): MgO24.8, CaF 2 21.5, Al 2 o 3 21.5, CaO6.5, Y 2 o 3 5.3, MnO6.8, SiO 2 24.5, S0.012, P0.021, add deoxidizer Si-Fe2~3;

[0033] 2) Same manufacturing process as Example 1

[0034] 3) Mechanical properties of weld deposited metal test

[0035]

[0036] 4) Welding test and performance test (with high steel grade welding wire BG-H06H2-2 and corresponding pipeline steel raw materials)

[0037]

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Abstract

The invention discloses a high-toughness high-welding speed sintered flux suitable for the submerged-arc welding of an X90 / X100 ultrahigh-strength pipeline steel pipe, and the high-toughness high-welding speed sintered flux comprises the following components in percentage by weight: more than or equal to 15 and less than or equal to 20 of CaF2, more than or equal to 20 and less than or equal to 25 of MgO, more than or equal to 15 and less than or equal to 20 of Al2O3, more than or equal to 10 and less than or equal to 15 of CaO, more than or equal to 1 and less than or equal to 5 of MnO, more than or equal to 25 and less than or equal to 30 of SiO2, more than or equal to 3 and less than or equal to 8 of Y2O3 and more than or equal to 1 and less than or equal to 4 of a reducing agent. The high-toughness high-welding velocity sintered flux disclosed by the invention ensures that the submerged-arc welding speed of the X90 / X100 ultrahigh-strength pipeline steel pipe is at the high welding speed of 1.5-1.8 m / minute, has good processing property of a welding seam, achieves the welding strength of more than 780 MPa, achieves the average toughness value of 130 J, achieves the deposited metal strength of more than 760 MPa, achieves the diffusible hydrogen content of less than 6.0ml / 100g (mercury method), belongs to a low-hydrogen welding material and can realize the high-strength high-toughness matching of the submerged-arc welding seam of the ultrahigh-strength pipeline steel pipe.

Description

Technical field: [0001] The invention belongs to submerged arc welding materials for ultra-high-strength pipeline steel pipes. It is aimed at the current development needs of oil and gas pipelines, and develops a high-toughness and high-speed welding flux suitable for submerged arc welding of X90 / X100 ultra-high-strength pipeline steel pipes. After using the flux of the present invention and matching the corresponding welding wire to weld the domestic X90 / X100 ultra-high-strength pipeline steel, it can ensure that at a high welding speed, the weld seam has high strength and high impact toughness at the same time, and can fully achieve API-5L-44 version standard requirements. Background technique: [0002] Oil and gas pipelines are an economical, safe and uninterrupted long-distance transportation tool for oil and natural gas. In recent years, with the continuous development and improvement of pipeline construction projects, the construction of long-distance gas pipelines wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28
Inventor 毕宗岳赵红波牛辉刘海璋张锦刚刘斌牛爱军黄晓辉张万鹏陈长青张君包志刚杨军
Owner BC P INC CHINA NAT PETROLEUM CORP
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