Submerged-arc welding wire for high-strength pipeline steel

A technology of high-strength pipeline steel and submerged arc welding wire, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of unfavorable heat treatment performance of weld seam, unfavorable impact toughness of steel grade, and increased smelting difficulty, etc. Achieve excellent post-weld heat treatment performance, increase acicular ferrite content, excellent toughness and corrosion resistance

Inactive Publication Date: 2005-12-21
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength of the existing submerged arc welding wire used for X70 steel is 550-620 MPa, and the welding wire used is such as the two patents of the Chinese patent No. 92 1 05621.4 and the patent No. 97 1 04393.0. If it is to match the strength of X80 steel , the tensile strength of welding wire weld metal reaches 670-740MPa, and has excellent toughness, obviously there is a mismatch
The Chinese patent number is ZL 01 106520.6, which contains Cu and Zr. Although the tensile str

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Embodiment 1: Smelting the welding wire of the present invention with a 0.5 ton electric furnace, its chemical composition weight percent is C 0.066, Si 0.08, Mn 1.78, Ni 0.15, Cr 0.10, Ti 0.05, Mo0.30, B 0.004, P 0.013, S 0.008, The balance is Fe. The welding wire of the present invention is matched with CHF101 or CHF105 flux to weld 17.5mm thick X80 pipeline steel plate. The test plate has double V-shaped grooves, blunt edge 5mm, and single-side groove angle of 40°. The weight percent of the chemical composition of the steel is: C0.045, Si0.27, Mn1.79, Ni0.28, Mo0.35, Cu0.23 and other microalloying elements Ti and Nb. The mechanical properties of steel are Rel=615Mpa, Rm=680MPa, Akv(-20℃) is 330J. Filler bead welding process parameters are welding current about 630A, welding voltage about 33V, and welding speed about 0.8cm / min. There are seven welding passes. Matched with CHF101, weld tensile properties Rel = 680MPa, Rm = 740MPa, A = 21.5%, Z = 73.5%, -20 ℃ impact p...

Embodiment 2

[0039] Embodiment 2: Smelting the welding wire of the present invention with a 0.5 ton electric furnace, its chemical composition weight percent is: C 0.064, Si 0.091, Mn 1.70, Ni 0.22, Cr0.33, Ti 0.08, Mo0.29, B 0.006, P 0.012, S 0.006, the balance is Fe. The welding wire of the present invention is matched with CHF101 flux, and a 17.5 mm thick X80 pipeline steel plate is welded with relatively large input energy. The test plate is a double V-shaped groove, a blunt edge of 10 mm, and a groove angle of 80°. Filler bead welding Welding current ~ 750A, welding voltage 32V, welding speed 0.6cm / min. The mechanical properties of the weld are Rel=620MPa, Rm=700MPa, A=21.0%, Z=75.0%. The tensile test of welded joints is broken to the base material. The impact energy of the welded joint is Akv (-20°C) 175J, the fusion line is 192J, and the heat-affected zone is 188J. With larger input energy, the welding groove is significantly reduced, and the number of welding passes is three. G...

Embodiment 3

[0040] Example 3: The welding wire of the present invention is smelted in a 0.5-ton electric furnace, and its chemical composition weight percent is: C 0.052, Si 0.070, Mn 1.70, Ni 0.40, Cr 0.45, Ti 0.10, Mo0.35, B 0.008, P 0.012, S 0.006 , the balance being Fe. Match with CHF101, welding 15mm thick X80 steel. The welding test plate is a double V-shaped groove, the blunt edge is 8mm, and the single-side groove angle is 40°. The welding process parameters are welding current 700A, welding voltage 31V, and welding speed 60cm / min. The mechanical properties of the weld are Rel=690MPa, Rm=735MPa, A=23%, Z=72%, Akv(-20°C)=170J, Akv(-40°C)=135J. Weld seam impact energy has a large margin. The weld structure is acicular ferrite + proeutectoid ferrite, and the base metal structure is tempered sorbite.

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Abstract

The present invention relates to the high intensity pipeline steel burying arc solder. It solutes the question that because of the Cu's deposition, it leads to separate out Cu easily and ossify the steel in the smelting and the disposal of the heat and contains too many microelements so that it has disbennifits to the smelting technical control. The technical steps are that the weight percent of the chymic component is C 0.04~0.12,Si 0.005~0.10,Mn 1.20~2.00,Ni 0.10~0.60,Cr 0.10~0.60,Mo 0.10~0.50,Ti 0.04~0.15,B 0.002~0.012,P<=0.015,S<=0.01, and the allowance is Fe. The invention solders matchingly with the alkalescence sinter flux. The resist drawing intensity of the welding line is higher than 650MPa.The intensity of the welding line of the jointing X80 pipe line steel reaches 740MPa, and the -20 Deg. C concussion power is higher than 120J.Then the content of the welding line S and P is low and the degree of purity is high. It applies to the burying arc jointing of the X80 high intensity pipeline steel and the other corresponding intensity low levels' alloy which resisted drawing intensity is between 620 and 740MPa.

Description

technical field [0001] The invention relates to a submerged arc welding wire for multi-element alloyed high-strength pipeline steel, in particular to a high-strength pipeline steel whose tensile strength is higher than 650 MPa when welding with alkaline sintering flux. Other low alloy high strength steel with submerged arc welding wire. Background technique [0002] With the application of advanced steel production technology, the performance of low-alloy high-strength steel has been continuously improved. Pipeline steel represents the advanced level of today's low-alloy high-strength steel. API X80 steel is the main pipeline steel variety in the world, and it will be gradually applied in my country. The S content of pipeline steel is getting lower and lower, and the steel quality is getting purer. The metallographic structure is ferrite plus bainite, and the grain diameter reaches several microns. The strength and toughness of the pipeline steel are improved simultaneou...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 黄治军缪凯曹修悌王玉涛刘吉斌张小枫陈浮
Owner WUHAN IRON & STEEL (GROUP) CORP
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