Unlock instant, AI-driven research and patent intelligence for your innovation.

High strength submerged arc welding wire for pipeline steel

A submerged arc welding wire, high-strength technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of unable to meet welding requirements, only tensile strength, etc., to achieve good welding process performance, good low temperature Effect of impact toughness, high weld strength and impact toughness values

Active Publication Date: 2012-02-01
BAOJI PETROLEUM STEEL PIPE
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the carbon content of X100 grade pipeline steel has reached an ultra-low carbon level of less than 0.07%, its metal structure is mainly bainitic ferrite, and the weld metal is required to match it, so the existing submerged arc welding wire can no longer meet the requirements. X100 pipeline steel welding requirements urgently need to develop new submerged arc welding wire suitable for X100 welded pipe welding
At present, the highest grade of welding wire for domestic pipeline steel reaches X80 steel grade, and the tensile strength of the weld is only 625MPa, while there is no report on the submerged arc welding wire for pipeline steel with a tensile strength above 760MPa.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The chemical composition Wt% of the welding wire is (the balance is Fe):

[0026] Element

[0027] The welding wire of the present invention is combined with BG-SJ101H1 flux to weld domestic X100 pipeline steel, the thickness of the welding test plate is 14.7mm, the groove angle is 60°, the welding specification is: welding speed 1.7±0.2m / min, heat input 27KJ / cm, double-sided Welding without preheating and post heat treatment. The mechanical properties of the weld metal are: σ b =801MPa, -10℃CA kv =146J.

Embodiment 2

[0029] The chemical composition Wt% of the welding wire is (the balance is Fe):

[0030] Element

[0031] The welding wire of the present invention is combined with BG-SJ101H1 flux to weld domestic X100 pipeline steel, the thickness of the welding test plate is 14.7mm, the groove angle is 80°, the welding specification is: welding speed 1.7±0.2m / min, heat input 25KJ / cm, double-sided Welding without preheating and post heat treatment. The mechanical properties of the weld metal are: σ b =782MPa, -10℃CA kv = 173J.

Embodiment 3

[0033] The chemical composition Wt% of the welding wire is (the balance is Fe):

[0034] Element

[0035] The welding wire of the present invention is combined with BG-SJ101H1 flux to weld domestic X100 pipeline steel, the thickness of the welding test plate is 14.7mm, the groove angle is 80°, the welding specification is: welding speed 1.7±0.2m / min, heat input 27KJ / cm, double-sided Welding without preheating and post heat treatment. The mechanical properties of the weld metal are: σ b =839MPa, -10℃CA kv = 168J.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a high-strength submerged arc welding wire for pipeline steel, the chemical composition Wt% of which is: C0.02-0.10; Si 0.10-0.60; Mn 1.50-2.50; P<0.010; S<0.010; Ni0.7-3.0 ; Ti 0.05-0.2; Mo 0.20-0.60; B 0.003-0.02; the balance is Fe. Matching the present invention with BGSJ101H1 flux and other special fluxes for pipeline steel welding can obtain the best weld strength and toughness, the tensile strength of the weld metal σb≥760Mpa; the impact energy of the weld metal at -10°C Akv≥120J, suitable for high-pressure oil, High-speed submerged arc welding of X100 ultra-high steel grade pipeline steel plates for gas transmission pipelines.

Description

technical field [0001] The invention relates to a high-strength submerged arc welding wire for pipeline steel, which belongs to the technical field of welding material manufacturing, and is particularly suitable for high-speed submerged arc welding of X100 grade pipeline steel plates. Background technique [0002] Oil and gas pipelines are made of high-grade steel pipes, which can increase the delivery pressure under the same delivery volume, reduce the diameter of the pipe, reduce the weight of the pipe, reduce the cost of the pipe and the transportation cost of the pipe, and at the same time reduce the construction cost of the pipeline construction (because ditching fee, welding cost, etc.), anti-corrosion coating cost, etc. In some cases the number of compressor stations can also be reduced. At present, the X80 material pipeline steel used in large quantities in the Second West-East Gas Pipeline Pipeline saves about 4.2 billion yuan in total construction costs compared w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30
Inventor 雷胜利杨忠文毕宗岳牛辉赵红波刘海璋王建牛爱军
Owner BAOJI PETROLEUM STEEL PIPE