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Solder wire material of submerged-arc welding for high grade pipeline steel

A pipeline steel, high-grade technology, applied in the direction of welding/cutting medium/material, arc welding equipment, welding medium, etc., can solve the problems of reducing toughness, difficult to meet, difficult to form passivation film, etc., to achieve good low temperature toughness, The effect of high weld strength

Inactive Publication Date: 2006-11-22
XIAN UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the welded joints of high-grade pipeline steel must be dense acicular ferrite and a small amount of bainite under low carbon. The hardness of the welded joint is low, and another feature is low sulfur. For high-grade pipeline steel welding For joints, all three factors must be fulfilled, otherwise the hydrogen sulfide resistance cannot be guaranteed, and high strength and low temperature toughness are also difficult to obtain
How to ensure the strength and toughness and low temperature toughness of welded joints, the submerged arc welding wire for pipeline steel at home and abroad has GB2090615 "Welding Materials with Micro Molybdenum or No Molybdenum" "WELDING MATERIALSCONTAINING LITTLE MOLYBDENUM" applied in the UK in 1982, public number GB2090615, public date 14.07 .1982, Patent Granted with effect from 24.10.1984(Section 25(1))with title WELDING MATERIALS CONTAINING LITTLE MOLYBDENUM), its alloy system is C-Mn-Cr-(Mo)-Ti-B; 92 years of iron and steel research of the Ministry of Metallurgy The General Institute and others applied for "Low Carbon Microalloyed Submerged Arc Welding Wire", patent number ZL92105621.4, publication number 1068528, publication date 1993.02.03, and its alloy system is C-Mn-Mo; the welding wire materials disclosed in these patent documents are insufficient 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 number ZL01106520.6, publication number 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 H by only relying on the acicular ferrite structure of the weld. 2 The intrusion of hydrogen in S, and the yield strength is difficult to meet the requirements of X80 grade pipeline steel

Method used

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  • Solder wire material of submerged-arc welding for high grade pipeline steel
  • Solder wire material of submerged-arc welding for high grade pipeline steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Get 0.038% C by weight percentage, 0.040% Si, 1.800% Mn, 1.460% Ni, 0.270% Mo, 0.240% Cu, 0.025% Ti, 0.150% Ce, 95.977% Fe, use Smelting 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 the P to less than 0.015%, and the prepared welding wire gold phase organization see figure 1 .

[0026] 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 580A on the first side, 650A on the second side, welding voltage 32V, and welding sp...

Embodiment 2

[0032] Get 0.030% C by weight percentage, 0.100% Si, 2.000% Mn, 1.330% Ni, 0.200% Mo, 0.300% Cu, 0.040% Ti, 0.250% Ce, 95.750% Fe, use 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 the P to less than 0.015%.

[0033] 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.

[0034]

[0035]

Embodiment 3

[0037] Get 0.053% C by weight percentage, 0.010% Si, 1.500% Mn, 1.030% Ni, 0.280% Mo, 0.200% Cu, 0.030% Ti, 0.100% Ce, 96.797% Fe, use Conventional electric furnace smelting method, adding Cu, Ce, Ti-Fe, Mo-Fe during refining, controlling the tapping temperature to 1560°C, controlling the impurity S in the material to less than 0.005%, and the P to less than 0.015%.

[0038] 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.

[0039]

[0040]

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Abstract

A submerged arc welding wire material for high-grade pipeline steel, which is composed of the following components by weight percentage: 0.030%-0.080% C, 0.010%-0.200% Si, 1.500%-2.000% Mn, 1.000% ~1.500% Ni, 0.200%~0.300% Mo, 0.200%~0.300% Cu, 0.020%~0.040% Ti, 0.100%~0.250% Ce, the balance is Fe, the sum of the weight of each component is 100%. When the welding wire material of the present invention obtained by the electric furnace smelting method is used in combination with the basic sintered flux, it has high weld strength and good resistance to H 2 S stress corrosion and good low-temperature toughness and other properties, the strength and toughness of the weld can fully match the base material of high-grade pipeline steel, suitable for σ s ≥550MPa and above strength level pipeline steel and other structural steel welding.

Description

technical field [0001] The invention relates to a welding wire material, in particular to a submerged arc welding welding wire material for high-grade pipeline steel. 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 order to improve the stress resistance of long-distance pipelines, especially gas pipelines Corrosion and re...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K9/18
Inventor 张敏张前进姚成武
Owner XIAN UNIV OF TECH
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