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

A pipeline steel and welding wire technology, applied in the direction of welding/cutting medium/material, welding equipment, welding medium, etc., can solve the problems of reduced toughness, difference in chemical composition of welding wire, and strength that cannot meet the requirements of high-grade pipeline steel, etc., to achieve good Low temperature toughness and high weld strength

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

AI Technical Summary

Problems solved by technology

How to ensure the strength, toughness and low temperature toughness of welded joints, the submerged arc welding wire for pipeline steel at home and abroad has GB2090615 "Welding Materials Containing Little Molybdenum or No Molybdenum" applied in the UK in 1982, "WELDING MATERIALS CONTAINING LITTLEMOLYBDENUM", publication number GB2090615, publication date 14.07 .1982, Patent Granted witheffect from 24.10.1984(Section 25(1))with title.WELDING MATERIALSCONTAINING LITTLE MOLYBDENUM), its alloy system is C-Mn-Cr-(Mo)-Ti-B; 92 years of steel research of the Ministry of Metallurgy The General Institute and others applied for "Low Carbon Microalloyed Submerged Arc Welding Wire" (Patent No. ZL92105621.4, Publication No. 1068528, Publication Date 1993.02.03), whose alloy system is C-Mn-Mo; the welding wire materials disclosed in these patent documents The disadvantage is that pearlite is formed in the weld seam, which reduces the toughness, and the strength cannot meet the requirements of high-grade pipeline steel.
In 2001, Wuhan Iron and Steel (Group) Company developed "High Performance Pipeline Steel Submerged Arc Welding Wire" (Patent No. ZL01106520.6, Publication No. 1305879, Publication Date 2001.08.01), and its alloy system is C-Mn-Cr-Ni-Ti -B, compared with the traditional welding wire, the performance of this welding wire has been greatly improved, but it is difficult to form a passivation film to resist the intrusion of hydrogen in H2S by only relying on the acicular ferrite structure of the weld seam, and the yield strength is difficult to meet X80 Grade Pipeline Steel Requirements
In 2007, Huabei Petroleum Steel Pipe Factory developed "X80 Pipeline Steel Submerged Arc Welding Wire" (application number 200710139338.5, publication number CN101254575, publication date 2008.09.03), its alloy system is C-Mn-Mo-Ti-B, its weld The quality of the heat-affected zone and heat-affected zone can meet the technical requirements of high strength, high toughness and low hardness of welded steel pipes for oil and gas transportation, but the chemical composition of the welding wire in the present invention has a large difference compared with it

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 0.043% C by weight, 0.200% Si, 1.800% Mn, 0.890% Ni, 0.700% Mo, 0.500% Cr, 0.210% Cu, 0.012% Ti, 0.100% Ce, and more The content is Fe, smelted by conventional electric furnace smelting method, adding Cu, Ce, Ti-Fe, Mo-Fe during refining, controlling the tapping temperature to 1570°C, controlling the impurity S in the material to less than 0.005%, and P to less than 0.015%.

[0028] The welding wire is matched with SJ101G flux 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 side, welding voltage 32V, and welding speed 26m / h. For the metallographic structure of the resulting w...

Embodiment 2

[0035] Take 0.040% C by weight, 0.030% Si, 1.700% Mn, 0.500% Ni, 0.200% Mo, 0.340% Cr, 0.300% Cu, 0.030% Ti, 0.220% Ce, and more The content is Fe, smelted by conventional electric furnace smelting method, adding Cu, Ce, Ti-Fe, Mo-Fe during refining, controlling the tapping temperature to 1550°C, controlling the impurity S in the material to less than 0.005%, and P to less than 0.015%.

[0036] The welding wire is matched with SJ101G flux to weld X80 pipeline steel with a thickness of 15 mm. The chemical composition and welding process of the steel are the same as those 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.

[0037] Table 3 Tensile and hardness tests of welded joints of grade X80 pipeline steel

[0038]

project

R eL (MPa)

R m (MPa)

...

Embodiment 3

[0043] Take 0.051% C by weight, 0.010% Si, 1.810% Mn, 1.000% Ni, 0.470% Mo, 0.600% Cr, 0.200% Cu, 0.005% Ti, 0.150% Ce, and more The content is Fe, smelted by conventional electric furnace smelting method, adding Cu, Ce, Ti-Fe, Mo-Fe during refining, controlling the tapping temperature to 1570°C, controlling the impurity S in the material to less than 0.005%, and P to less than 0.015%.

[0044] The welding wire is matched with SJ101G flux to weld X80 pipeline steel with a thickness of 15 mm. The chemical composition and welding process of the steel are the same as those 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.

[0045] Table 5 Tensile and hardness tests of welded joints of grade X80 pipeline steel

[0046]

project

R eL (MPa)

R m (MPa)

...

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Abstract

A submerged arc welding wire material for X80 pipeline steel comprises the following components according to weight percentage: 0.040 percent to 0.060 percent of C, 0.010 percent to 0.200 percent of Si, 1.700 percent to 2.000 percent of Mn, 0.500 percent to 1.000 percent of Ni, 0.200 percent to 0.700 percent of Mo, 0.200 percent to 0.600 percent of Cr, 0.005 percent to 0.040 percent of Ti, 0.100 percent to 0.250 percent of Ce, 0.200 percent to 0.300 percent of Cu and the residual percentage of Fe, and the weight sum of the components is 1.00 percent. When being matched with alkali sintered flux for use, the welding wire material that is obtained by adopting an electric furnace smelting 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 555 MPa and above and other structural steel.

Description

technical field [0001] The invention relates to a welding wire material, in particular to a submerged arc welding wire material for X80 grade pipeline steel used for oil and gas transmission pipelines, and also relates to a preparation method of the welding wire 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-grade pipeline steel requires high strength, good low-temperature toughness and corrosion resistance, matching high-quality welding materials has also become one of the focuses of attention, in ord...

Claims

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Application Information

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IPC IPC(8): B23K35/30C22C33/04
Inventor 张敏王超李继红
Owner XIAN UNIV OF TECH
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