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Heat-resisting steel flux-cored wire

A technology of flux-cored welding wire and heat-resistant steel, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of increased oxygen content of weld metal, decreased toughness of weld metal, and limited use environment, and achieves improvement of metal Toughness, improved oxidation resistance and thermal strength, easy-to-use effects

Inactive Publication Date: 2009-06-10
NINGBO LONGXING WELDING CUTTING TECH STOCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common welding methods for this type of steel include manual arc welding, submerged arc welding, metal arc welding and TIG welding. Usually, the traditional heat-resistant steel flux-cored wire must use a mixed gas (Ar+CO 2 ) as a protective gas to ensure the stability of the arc and the movement of metal droplets, but the price of Ar is relatively high, and Ar+CO 2 It is not easy to control, so the use environment of traditional heat-resistant steel flux-cored wire is limited
If 100% CO is used 2 Gas shielded welding has defects such as large spatter in the welding process, difficult slag removal, unstable arc, increased oxygen content in the weld metal, and reduced toughness of the weld metal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A low-carbon steel strip of 0.8×12mm (thickness×width) is selected and rolled into a U shape by a forming machine. Take 1000 grams of mixed material as an example: take 230 grams of rutile, 15 grams of wollastonite, 190 grams of silicon manganese alloy, 85 grams of iron powder, 15 grams of nickel powder, 25 grams of cryolite, 71 grams of feldspar, 130 grams of ferrochrome, 60 grams of ferromolybdenum, 60 grams of medium-carbon ferromanganese, 27 grams of magnesia, 61 grams of quartz, 5 grams of fluorite, 15 grams of aluminum-magnesium alloy, and 11 grams of ferro-titanium (the particle size of the powder obtained can pass through a 60-mesh sieve). Put the various powders taken into the powder mixer and mix for 40 minutes, then add the mixed powder into the U-shaped groove of the low-carbon steel belt, and the filling rate is 17%; close the U-shaped groove to wrap the powder in it; then pass The wire drawing machine draws and reduces the diameter step by step from a diam...

Embodiment 2

[0036] A low-carbon steel strip of 0.8×12mm (thickness×width) is selected and rolled into a U shape by a forming machine. Take 1000 grams of mixed materials as an example: take 215 grams of rutile, 19 grams of wollastonite, 200 grams of silicon-manganese alloy, 86 grams of iron powder, 17 grams of nickel powder, 25 grams of cryolite, 70 grams of feldspar, and 130 grams of ferrochrome. 60 grams of ferromolybdenum, 60 grams of medium-carbon ferromanganese, 25 grams of magnesia, 65 grams of quartz, 5 grams of fluorite, 15 grams of aluminum-magnesium alloy, and 8 grams of ferrotitanium (the particle size of the obtained powder is to pass through a 60-mesh sieve). Put the various powders taken into the powder mixer and mix for 40 minutes, then add the mixed powder into the U-shaped groove of the low-carbon steel belt, and the filling rate is 16%; close the U-shaped groove to wrap the powder in it; then pass The wire drawing machine draws and reduces the diameter step by step from a...

Embodiment 3

[0039] A low-carbon steel strip of 0.8×12mm (thickness×width) is selected and rolled into a U shape by a forming machine. Take 1000 grams of mixed materials as an example: take 210 grams of rutile, 25 grams of wollastonite, 190 grams of silicon manganese alloy, 90 grams of iron powder, 20 grams of nickel powder, 25 grams of cryolite, 70 grams of feldspar, 135 grams of ferrochrome, 60 grams of ferromolybdenum, 60 grams of medium-carbon ferromanganese, 30 grams of magnesia, 60 grams of quartz, 5 grams of fluorite, 15 grams of aluminum-magnesium alloy, and 5 grams of ferro-titanium (the particle size of the powder obtained can pass through a 60-mesh sieve). The various powders that are taken are put into the powder mixer and mixed for 40 minutes, then the mixed powder is added into the U-shaped groove of the low-carbon steel strip, the filling rate is 18%, the U-shaped groove is closed, and the powder is wrapped therein. Then, the flux-cored welding wire of the present invention ...

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PUM

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Abstract

The invention discloses a flux cored wire for heat resistant steel. Flux cored powder of the flux cored wire is formed by mixing the following components by weight percentage: 21 to 23 percent of rutile, 1.5 to 2.5 percent of aedelforsite, 19 to 21 percent of silicon-manganese alloy, 8.5 to 10.5 percent of ferrous powder, 1.5 to 2.5 percent of nickel powder, 2.5 to 3.5 percent of cryolite, 7 to 9 percent of feldspar, 13 to 14 percent of ferrochrome, 6 to 7 percent of ferromolybdenum, 6 to 7 percent of mid-carbon ferromanganese, 2.5 to 4.5 percent of magnesite, 6 to 7.5 percent of quartz, 0.5 to 2 percent of fluorite, 1.5 to 3 percent of aluminum-magnesium alloy and 0.5 to 2 percent of ferrotitanium. During the welding, the flux cored wire not only uses CO2 to protect shielded welding, but also has the advantages of small splash, easy slag removal, stable electric arc burning, and spray transfer as a droplet transfer form.

Description

technical field [0001] The invention relates to the technical field of metal welding materials, in particular to a heat-resistant steel flux-cored welding wire. Background technique [0002] Low- and medium-alloy pearlitic heat-resistant steels (including bainite steels) based on Cr-Mo (chromium-molybdenum) are important metal materials working under high-temperature conditions in power, petroleum and chemical industries. It is generally used in environments below 600°C. It not only has good oxidation resistance and heat strength, but also has good resistance to sulfuric acid and hydrogen corrosion. Common welding methods for this type of steel include manual arc welding, submerged arc welding, metal arc welding and TIG welding. Usually, the traditional heat-resistant steel flux-cored wire must use a mixed gas (Ar+CO 2 ) as a protective gas to ensure the stability of the arc and the movement of metal droplets, but the price of Ar is relatively high, and Ar+CO 2 It is not e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/22B23K9/16
Inventor 陈定龙鲁永顺
Owner NINGBO LONGXING WELDING CUTTING TECH STOCK
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