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Submerged arc welding wire for steel pipeline

A technology of submerged arc welding wire and pipeline steel, which is applied in the direction of arc welding equipment, welding medium, welding equipment, etc., can solve the problems of weld strength reduction, etc., and achieve low cost, cost reduction, high weld strength and impact toughness value Effect

Active Publication Date: 2008-01-16
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the carbon content decreases, the strength of the weld also decreases, so it is necessary to add solid solution strengthening elements that do not affect the toughness to ensure the toughness of the weld metal. The closest prior art to the present invention is WGX2 welding wire, patent No. It is 200510018993.6, but its C is 0.04-0.12%, the upper limit of carbon is already higher than 0.07%, and the carbon content of other existing patented welding wires is also high, so it is urgent to develop new welding wires with low carbon content, low cost and easy industrial realization. Patented welding wire matches ultra-low carbon X80 steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: adopt (hot metal desulfurization) → converter smelting → LF furnace refining → 160mm 2 Full protection pouring of billet casting machine. Low-sulfur molten iron is selected for steelmaking, and the steelmaking process is carried out according to the technical operation rules and relevant operating points. When organizing production, try to arrange top-bottom combined blowing converter blowing, and ensure the effect of top-bottom combined blowing, and strictly control the composition of steelmaking end points, Parameters such as tapping temperature and amount of slag are used to control the impurity elements S and P in the steel for welding wire of the present invention to be less than 0.01%. Will be 160mm 2 The billet is hot-rolled into a Ф5.5mm wire rod, and after removing the surface scale, wire drawing, and copper plating, it is made into a Ф4mm welding wire. The chemical composition of the welding wire (by weight%): C0.03, Mn1.85, Si0.12, Cr0.3, Mo0....

Embodiment 2

[0025] Embodiment 2: adopt above-mentioned process to produce welding wire, the chemical composition (by weight %) of welding wire: C0.05, Mn1.90, Si0.20, Cr0.2, Mo0.36, Ti0.065, B0.0035, surplus For iron and unavoidable impurities. The welding wire of the present invention is matched with BGSJ101-G flux to weld deposited metal. The material, specification, groove angle and welding process of the test plate are the same as those in Example 1, and the yield strength σ of deposited metal s =610Mpa, tensile strength σ of deposited metal b =665Mpa, elongation δ of deposited metal 5 =25%, impact energy A of deposited metal at -20°C kV =115J, impact energy A of deposited metal at -40℃ kV =70J.

[0026] Welding wire of the present invention is matched with BGSJ101-G flux to carry out X80 grade pipeline steel double-wire, double-sided submerged arc welding plate butt joint test, test plate specification, groove angle, welding process are the same as Example 1, and the tensile stre...

Embodiment 3

[0027] Embodiment 3: adopt above-mentioned process to produce welding wire, the chemical composition (by weight %) of welding wire: C0.07, Mn2.00, Si0.25, Cr0.2, Mo0.3, Ti0.07, B0.0035, balance For iron and unavoidable impurities.

[0028] The welding wire of the present invention is matched with the special SJ101 flux for pipeline steel produced by Atlantic Welding Materials Co., Ltd. to weld the deposited metal. The material, specification, groove angle and welding process of the test plate are the same as those in Example 1, and the yield strength σ of the deposited metal s =660Mpa, tensile strength σ of deposited metal b =717Mpa, elongation δ of deposited metal 5 =23%, ​​the -20℃ impact energy A of the deposited metal kV =100J, -40℃ impact energy A of deposited metal kV =56J.

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Abstract

The invention relates to a submerged arc welding wire used on a pipeline steel, which is applied in the submerged arc welding of an X80 high steel grade pipeline steel plate used on high-pressure oil and high-pressure gas conveying pipelines. The chemical components comprise (according to weight percent): C 0.02-0.07; Si 0.10-0.30; Mn 1.80-2.50; P is less than 0.010; S is less than 0.010; Cr 0.10- 0.50; Ti 0.05-0.08; Mo 0.20-0.50; B 0.003-0.004; and the rest is Fe. The welding wire is matched with BGSJ101-G flux and other special flux for pipeline steel welding , and then the best strength and toughness of welding seam can be obtained; the tensile strength ob of welded seam metal is more than or equal to 700MPa. Impact energy AkV of the welded seam metal in the minus 20 DEG C is more than or equal to 150J. And thus, the invention is suitable for the submerged arc welding of the X80 high steel grade pipeline steel plate.

Description

technical field [0001] The invention relates to a submerged arc welding wire for pipeline steel, which belongs to the field of welding materials and is particularly suitable for submerged arc welding of X80 grade pipeline steel plates. Background technique [0002] There are many domestic manufacturers and varieties of welding wire for welded pipes below X65. Welding wires for X65-X70 grade welded pipes currently have patented products H08C, H08D and H05M. What the present invention develops is special welding wire for X80 steel. Since the carbon content of X80 grade pipeline steel has reached an ultra-low carbon level of less than 0.07%, its metal structure is mostly acicular ferrite, and the weld metal is required to match it, so the weld structure should also be acicular Therefore, the carbon content of welding wire for X80 grade pipeline steel should not be too high. The existing welding wire has high carbon content, so it cannot be used; in addition, most of the paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K9/18
Inventor 丁晓军陈延清杨忠文张飞虎毕宗岳董现春牛辉邱利张少峰鞠建斌严继轩张永强郭占山
Owner SHOUGANG CORPORATION
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