Submerged arc welding flux material for X80 pipeline steel and preparing method thereof

A pipeline steel and flux technology, applied in arc welding equipment, welding/cutting medium/material, welding equipment, etc., can solve the problem of low strength, and achieve the effect of good low temperature toughness, easy access and high weld strength

Inactive Publication Date: 2009-10-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These patent documents are mainly aimed at low-strength steel, and for the X80 pipeline steel new

Method used

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  • Submerged arc welding flux material for X80 pipeline steel and preparing method thereof
  • Submerged arc welding flux material for X80 pipeline steel and preparing method thereof
  • Submerged arc welding flux material for X80 pipeline steel and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take 20.0% CaF by weight 2 , 24.0% MgO, 13.0% Al 2 o 3 , 7.0% CaSiO 3 , 8.0% MnO, 8.0% TiO 2 , 6.0% SiO 2 , 1% Na 2 O, 1.9% B 2 o 3 , 0.2% Re(Mg), 7.3% ZrO 2 , the others are ore powder impurities. It is sintered by conventional electric furnace sintering method, the sintering temperature is 800°C, and the sintering time is 2 hours.

[0042] The flux is matched with self-made H05MnNiMo welding wire ("Submerged Arc Welding Wire Material for High Grade Pipeline Steel", Patent No. ZL 200410073353.0, Publication No. CN1285444C) to weld 15mm thick X80 grade pipeline steel. The chemical composition of the steel mainly contains 0.06% C, 1.57% Mn, 0.24% Si, 0.29% Mo, 0.14% Ni, 0.045% Cu, 0.04% Nb, 0.013% Ti, 0.0006% B, 0.01% V, 0.005% S, 0.033% P. The welding process is an asymmetrical X-shaped groove, one weld on the front and back sides, and root cleaning on the back side. The welding process parameters are welding current 600A on the first side, 700A on the second...

Embodiment 2

[0049] Take 23.0% CaF by weight 2 , 28.0% MgO, 11.0% Al 2 o 3 , 6.0% CaSiO 3 , 5.0% MnO, 6.0% TiO 2 , 7.0% SiO 2 , 2.0% Na 2 O, 1.5% B 2 o 3 , 0.4% Re(Mg), 8.1% ZrO 2 , the others are ore powder impurities. It is sintered by conventional electric furnace sintering method, the sintering temperature is 900°C, and the sintering time is 3 hours.

[0050] The flux is matched with H05MnNiMo welding wire ("Submerged Arc Welding Wire Material for High Grade Pipeline Steel", Patent No. ZL 200410073353.0, Publication No. CN1285444C) to weld 15mm thick X80 grade pipeline steel. The chemical composition and welding process of the steel are the same as in Example 1. The welded joints are tested according to API 5L standard, and the cold bending performance is qualified. The tensile and hardness test results are shown in Table 3, and the impact test results are shown in Table 4.

[0051] Table 3 Tensile and hardness tests of welded joints of grade X80 pipeline steel

[0052] ...

Embodiment 3

[0056] Take 25.0% CaF by weight 2 , 15.0% MgO, 14.0% Al 2 o 3 , 6.0% CaSiO 3 , 8.0% MnO, 10.0% TiO 2 , 9.0% SiO 2 , 2.5% Na 2 O, 2.0% B 2 o 3 , 0.3% Re(Mg), 6.0% ZrO 2 , the others are ore powder impurities. It is sintered by conventional electric furnace sintering method, the sintering temperature is 800°C, and the sintering time is 4 hours.

[0057] The flux is matched with H05MnNiMo welding wire ("Submerged Arc Welding Wire Material for High Grade Pipeline Steel", Patent No. ZL 200410073353.0, Publication No. CN1285444C) to weld 15mm thick X80 grade pipeline steel. The chemical composition and welding process of the steel are the same as in Example 1. The welded joints are tested according to API 5L standard, and the cold bending performance is qualified. The tensile and hardness test results are shown in Table 5, and the impact test results are shown in Table 6.

[0058] Table 5 Tensile and hardness tests of welded joints of grade X80 pipeline steel

[0059] ...

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Abstract

A submerged arc welding flux material for X80 pipeline steel comprises the following components according to weight percentage: 15 percent to 25 percent of CaF2, 15 percent to 30 percent of MgO, 10 percent to 14 percent of Al2O3, 5 percent to 10 percent of CaSiO3, 5 percent to 9 percent of SiO2, 5 percent to 10 percent of MnO, 5 percent to 10 percent of TiO2, 1.0 percent to 2.5 percent of Na2O, 1.5 percent to 3.0 percent of B2O3, 0.2 percent to 0.4 percent of Re(Mg) and 6 percent to 10 percent of ZrO2, wherein the weight percentage of CaSiO3 plus SiO2 is less than or equal to 15 percent of the total weight of all the components, and the residual is mineral powder impurity. When being matched with alkali sintered flux for use, the welding flux material that is obtained by adopting a sintering method has the properties of strong weld seam strength, better H2S stress corrosion resistance and better low-temperature flexibility, the weld seam strength and the flexibility can be matched with substrate of high-grade pipeline steel, and the material is suitable for welding pipeline steel with the strength level ReL of more than or equal to 555 MPa and above and other structural steel.

Description

technical field [0001] The invention relates to a flux material, in particular to a submerged arc welding flux material for high-strength toughness X80 pipeline steel, and also relates to a preparation method of the flux material. Background technique [0002] Oil and natural gas pipelines are usually located in areas with relatively harsh environments, such as extremely cold areas, seismic zones or ocean areas. The requirements for high strength and low temperature toughness of pipelines are increasing, which prompts high-grade pipeline steel (X80 pipeline steel) The successful development of X80 pipeline steel has been hailed as the steel for natural gas transmission pipelines in the 21st century by industrially developed countries. High-strength pipeline steel requires high-strength, good low-temperature toughness and high-quality welding materials that match it has also become one of the focuses. In order to improve the strength and toughness of long-distance pipelines, ...

Claims

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Application Information

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IPC IPC(8): B23K35/362B23K9/18B23K35/40
Inventor 张敏王超李继红
Owner XIAN UNIV OF TECH
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