High-manganese austenitic low-temperature steel electrode with seamless welding core and preparation method

A technology of austenitic and low-temperature steel, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of poor welding processability, low utilization rate of electrodes, easy redness of electrodes, etc., and achieve stable arc, clear molten pool, The effect of good welding processability

Active Publication Date: 2021-04-02
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are also researches on high manganese steel welding rods, but the welding cores used are all smelted alloy steel solid welding cores, which have high resistance, and the electrodes are prone to redness and coating peeling off during use, resulting in poor welding processability and poor welding performance. The utilization rate is low; or the welding core used is a low-carbon steel welding core, which mainly transfers the alloy to the weld through the coating, and is applied to cast steel with a manganese content of 11wt%~14wt%; in view of the above situation, this The invention proposes a high-manganese austenitic low-temperature steel welding electrode with a seamless welding core and its preparation method

Method used

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preparation example Construction

[0024] A preparation method for an electric welding electrode for high manganese austenitic low-temperature steel with a seamless welding core, comprising the following steps:

[0025] (1) Weigh each component in the drug core as required, first bake potassium carbonate and potassium titanate at a high temperature of 440~460°C and keep it warm for 0.8~1.2h to remove water;

[0026] (2) Mix the treated potassium carbonate and potassium titanate with other components in the drug core, and keep warm at 110~130°C after mixing to avoid moisture absorption of potassium carbonate and potassium titanate again, and obtain the drug core pink;

[0027] (3) Weigh each component in the drug skin according to the requirements, and mix and stir evenly to obtain a dry powder, then add pure sodium water glass with a total dry powder weight of 24 to 30% to the dry powder, mix and stir, and the pure sodium water glass The modulus is 3.2 and the density is 1.40~1.45g / mm 3 , Baume degree is 43°;...

Embodiment 1

[0055] An electric electrode for high manganese austenitic low-temperature steel with a seamless welding core, including a welding core and a coating, the welding core includes a flux core and a skin, and the flux core accounts for 34 to 35% of the total weight of the welding core , each component in the described medicine core comprises by weight ratio: metal manganese powder 90%, graphite 3%, potassium carbonate 3%, potassium titanate 0%, reduced iron powder 4%; In described metal manganese powder, comprise following The chemical composition of the mass fraction: Mn≥97.0%, C≤0.05%, S≤0.02%, P≤0.03%, the graphite includes the following chemical composition of the mass fraction: C≥95%, S≤0.10%, P≤ 0.010%, the chemical composition that comprises following mass fraction in described potassium carbonate: K 2 CO 3 ≥98.0%, S≤0.02%, P≤0.02%, the potassium titanate contains the following chemical components in mass fraction: 30~35% Na 2 O+K 2 O, 50~59 TiO 2 , S≤0.02%, P≤0.02%;

...

Embodiment 2

[0065] An electric electrode for high manganese austenitic low-temperature steel with a seamless welding core, including a welding core and a coating, the welding core includes a flux core and a skin, and the flux core accounts for 34 to 35% of the total weight of the welding core , each component in the described medicine core comprises by weight ratio: metal manganese powder 90%, graphite 3%, potassium carbonate 3%, potassium titanate 0%, reduced iron powder 4%; In described metal manganese powder, comprise following The chemical composition of the mass fraction: Mn≥97.0%, C≤0.05%, S≤0.02%, P≤0.03%, the graphite includes the following chemical composition of the mass fraction: C≥95%, S≤0.10%, P≤ 0.010%, the chemical composition that comprises following mass fraction in described potassium carbonate: K 2 CO 3 ≥98.0%, S≤0.02%, P≤0.02%, the potassium titanate contains the following chemical components in mass fraction: 30~35% Na 2 O+K 2 O, 50~59 TiO 2 , S≤0.02%, P≤0.02%;

...

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Abstract

The invention discloses an electric welding rod with a seamless core wire for high-manganese austenitic low-temperature steel and a preparation method. The preparation method comprises the steps thatcomponents in a flux core are weighed according to the weight ratio, specifically, the flux core is prepared from the components in percentage by weight: 90-96% of metal manganese powder, 1-3% of graphite, 1-3% of potassium carbonate, 0-2% of potassium titanate and the balance of reduced iron powder, and potassium carbonate and potassium titanate are first baked at a high temperature to remove moisture, mixed with other components in the flux core and subjected to heat preservation to obtain flux core powder; components in flux skin are weighed, specifically, the flux skin is prepared from thecomponents in percentage by weight: 27-33% of marble, 4-11% of barium carbonate, 20-24% of fluorite, 1-3% of rutile, 3-7% of aluminum oxide, 1-3% of quartz, 1-3% of dehydrated mica, 1-2% of CMC, 7-12% of 45# ferrosilicon, 3-8% of metal nickel powder, 5-10% of metal chromium powder, 3-8% of metal molybdenum powder and 0-1% of ferrochrome nitride, the components are mixed and stirred uniformly to obtain dry powder, and then pure sodium water glass is added to the dry powder to be mixed and stirred; and the surface of a low-carbon steel strip is pressed into a U type, the flux core powder is added to prepare a flux-cored wire blank, the flux-cored wire blank is subjected to drawing and reducing to prepare the seamless core wire, and the electric welding rod is prepared from the seamless corewire and the flux skin. The prepared welding rod has small resistance, good welding manufacturability, stable electric arcs, easy slag removal, no pores, moisture absorption resistance and good low-temperature toughness.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a high-manganese austenitic low-temperature steel welding electrode with a seamless welding core and a preparation method thereof, which are suitable for welding high-manganese austenitic low-temperature steel natural gas storage tanks. Background technique [0002] With the rapid development of the global economy and the emphasis on environmental protection in various countries, the demand for natural gas (LNG) is increasing day by day. my country is a big energy consumer. With the development of my country's economy and society, the contradiction between supply and demand in the energy field has become increasingly prominent. In order to promote energy and mineral resources cooperation between my country and related countries, ensure national energy security and safeguard the interests of domestic shipowners, it is imminent to expand the scale of self-built LNG fleet. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/40
CPCB23K35/0266B23K35/3026B23K35/40
Inventor 叶凡亢天佑王亚彬
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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