Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel

A technology for high-energy welding and production process, which is applied to the steel production process for high-energy welding and the field of pre-melted slag-magnesium cored wire, which can solve difficult Mg content, adjust the timing of adding Mg, and cannot fully realize Mg. Independent control, precise control of Mg in difficult steel, etc., to achieve the effect of high effect and utilization rate, dispersion of inclusions, and refinement of structure

Inactive Publication Date: 2016-09-07
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
View PDF11 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Magnesium metal is a relatively active element with a boiling point of 1107°C. Due to the high temperature of molten steel in the steelmaking process, its vapor pressure is as high as 2.0×10 6 Pa, so the addition of magnesium in molten steel is prone to evaporation loss and oxidation loss. Improper addition will cause strong oxidation reaction and strong splash in molten steel, which is easy to cause safety problems, and it is also difficult to accurately control Mg in steel
European patent EP1052303A2 "Low-alloy high-strength steel with excellent low-temperature toughness when welded with large input energy" introduced the method of using Ti-Mg composite to obtain fine oxide particles in the test steel, but this test method is only suitable for laboratory vacuum smelting furnace smelting
Chinese patent CN 103938065 A "A Method for Compositely Adding Magnesium and Titanium to Steel for Large Energy Input Welding" adopts the method of feeding Mg-Y-Ni alloy wire in the tundish to increase the Mg concentration in the molten steel, and it is inevitable to add Mg at the same time The introduction of other elements, it is difficult to achieve separate adjustment of Mg content
Chinese patent CN 101724774 A "method of adding magnesium in the process of welding thick steel plate with large input energy", and Chinese patent CN 102191356 A "inclusion control method of thick steel plate for large input The Ni-Mg alloy method obtains a stable Mg yield in steel, but this method is suitable for smelting in a small-scale vacuum smelting furnace, and cannot realize the large-scale industrial production of converter-continuous casting, and it will inevitably bring other element, it is difficult to adjust the Mg content and the timing of adding Mg
Chinese patent CN 203048979 U "a solid metal magnesium alloy cored wire for steelmaking desulfurization", although its method is used for steelmaking desulfurization, not for microalloying of steel for high heat input welding, its solid metal magnesium The core of the alloy cored wire is a magnesium alloy, and other metal elements will also be brought in when the molten steel is fed, and the independent control of Mg cannot be fully realized
And it contains Mg93.6%, when this cored wire is fed to molten steel, it cannot achieve flame retardancy
When the cored wire is fed into the molten steel, the cored wire is melted by the molten steel, and the red hot cored end will continue to oxidize strongly, burning the entire cored wire all the time, and cannot be used for actual production

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel
  • Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel
  • Pre-melted-slag-magnesium grain cored wire, application of pre-melted-slag-magnesium grain cored wire and production process for high heat input welding steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A pre-melted slag-magnesium particle cored wire with a diameter of 13mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow release passivated magnesium particles , The core includes slow-release agent and passivated magnesium particles, the slow-release agent is calcium aluminate pre-melted slag, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content. Passivated magnesium grains contain 92% magnesium, and the rest are passivating agents and unavoidable impurities.

[0033] The chemical composition and mass percentage range of the slow-release agent calcium aluminate pre-melted slag are as follows: Al 2 o 3 : 46%, CaO: 43%, SiO 2 : 3%, MgO: 4%, Na 2 O: 2%, H 2 O: 0.5%, and the balance is unavoidable impurities.

[0034] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion...

Embodiment 2

[0044] A pre-melted slag-magnesium particle cored wire with a diameter of 12mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow-release passivated magnesium particles , The core includes slow-release agent and passivated magnesium particles, the slow-release agent is calcium aluminate pre-melted slag, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content. Passivated magnesium grains contain 93% magnesium, and the rest are passivating agents and unavoidable impurities.

[0045] The chemical composition and mass percentage range of the slow-release agent calcium aluminate pre-melted slag are as follows: Al 2 o 3 : 45%, CaO: 44%, SiO 2 : 4%, MgO: 3%, Na 2 O: 3%, H 2 O: 0.5%, and the balance is unavoidable impurities.

[0046] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion...

Embodiment 3

[0056] A pre-melted slag-magnesium particle cored wire with a diameter of 11mm, the cored wire includes an outer layer and a core; the outer layer is low carbon steel 08Al with a thickness of 1.0mm; the core is slow-release passivated magnesium particles , The core includes slow-release agent and passivated magnesium particles, the slow-release agent is calcium aluminate pre-melted slag, the slow-release agent accounts for 75% of the core content, and the passivated magnesium particles account for 25% of the core content.

[0057] The chemical composition and mass percentage range of the slow-release agent calcium aluminate pre-melted slag are as follows: Al 2 o 3 : 46%, CaO: 41%, SiO 2 : 4%, MgO: 4%, Na 2 O: 4%, H 2 O: 0.5%, and the balance is unavoidable impurities.

[0058] The particle size of passivated magnesium particles is 0.5-3 mm, and the proportion of particle size ≤ 80 mesh is 4%.

[0059] Bulk density of core-coated slow-release passivated magnesium particles...

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
Diameteraaaaaaaaaa
Thicknessaaaaaaaaaa
Granularityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a pre-melted-slag-magnesium grain cored wire, application of the pre-melted-slag-magnesium grain cored wire and a production process for high heat input welding steel. The cored wire comprises an outer layer and a clad core. Low-carbon steel serves as the outer layer, and the thickness ranges from 0.5 mm to 1.0mm; sustained-release passivated magnesium grains serve as the clad core, and the clad core comprises a sustained-release agent and passivated magnesium grain bodies; and calcium-aluminate pre-melted slag serves as the sustained-release agent, the sustained-release agent accounts for 5%-90% of the clad core, and the passivated magnesium grain bodies account for 10%-95% of the clad core. The application refers to application of the cored wire in manufacturing of the high heat input welding steel. According to the production process, the sustained-release passivated magnesium grain cored wire with the calcium-aluminate pre-melted slag serving as the sustained-release agent is fed into molten steel, the absorption rate of Mg is stable, the effect and the utilization rate of Mg are high, slag inclusions are dispersed and abundant, and the slag inclusions containing Mg reach over 80%. By the adoption of the pre-melted-slag-magnesium grain cored wire, application and the production process, control is easy, production cost is low, and industrialized mass production of the high heat input welding steel can be achieved.

Description

technical field [0001] The invention belongs to the technical field of low-alloy steel manufacturing, and in particular relates to a pre-melted slag-magnesium particle cored wire and its application and a production process of steel for high-energy-input welding. Background technique [0002] Steel plates are widely used in infrastructure and large structures such as buildings, bridges, pressure vessels, storage tanks, pipelines and ships. The development trend of large-scale and high-rise building components requires that the thickness of the steel plate be increased, and at the same time have higher comprehensive properties, including higher mechanical properties, efficient processing properties, and excellent corrosion resistance and fatigue damage resistance. [0003] However, as the strength of the steel plate increases, its impact toughness and weldability decrease significantly, and the susceptibility to weld cracks increases. In order to improve the welding efficien...

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
IPC IPC(8): C21C7/00C21C7/06C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C22C33/04
CPCC21C7/0006C21C7/0056C21C7/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 王硕明刘增勋张庆军孙立根张彩军朱立光韩毅华王雁
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products