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Flux-cored wire for gas shielded welding of super duplex stainless steel and preparation method thereof

A duplex stainless steel, gas shielded technology, used in welding equipment, welding media, welding/cutting media/materials, etc., can solve the problem of reduced corrosion resistance, difficult to accurately control the chemical composition of the weld metal and the ratio of the two phases, and waste of steel and other problems, to achieve the effect of good welding seam forming quality and excellent welding process performance.

Active Publication Date: 2020-12-08
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical bottleneck in the popularization and application of super duplex stainless steel is that the corrosion resistance of the welded joint does not match the base metal. The welded joint is the weak link of the stainless steel welded structure. In a corrosive environment, the joint will be corroded first, causing the overall failure of the structure. As a result, the corrosion resistance of super duplex stainless steel cannot be fully utilized, resulting in a large amount of waste of steel
[0006] Literature research shows that no welding material is added during welding, and the molten or molten super duplex stainless steel parent metal solidifies and cools to form a welded joint under the action of a welding heat source, but the austenite content of the weld is only about 30%. Its corrosion resistance is significantly reduced; the austenite content of the weld metal can be increased by feeding nitrogen gas during the welding process, but since the nitrogen comes from the shielding gas, its transition coefficient depends on the degree of ionization of the nitrogen gas during the welding process and the nitrogen element in the welding process. The solubility in the molten pool is greatly affected by the welding process parameters, and the chemical composition of the weld metal and the ratio of the two phases are not easy to accurately control

Method used

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  • Flux-cored wire for gas shielded welding of super duplex stainless steel and preparation method thereof
  • Flux-cored wire for gas shielded welding of super duplex stainless steel and preparation method thereof
  • Flux-cored wire for gas shielded welding of super duplex stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Select an austenitic 316L stainless steel strip with a thickness of 0.4mm, a width of 10mm, and a weight of 3347g (see Table 1 for the main components and specifications), roll it into a U shape, and mix 380g of chromium powder, 125g of high-nitrogen ferrochrome, and 30g of electrolytic Manganese metal, 50g molybdenum powder, 10g ferrosilicon, 15g ferrosilicon, 10g aluminum-magnesium alloy, 200g rutile, 20g quartz, 60g zircon sand, 15g potassium feldspar, 35g albite, 15g fluorite, 10g sodium cryolite, 15g of potassium titanate, 3g of bismuth oxide, 7g of iron powder, 1000g of drug powder in total, the particle size, baking temperature and time of each drug powder are shown in Table 2, after mixing evenly, add to the U-shaped tank, the filling rate is 23.0%, after closing the mouth, after several The diameter is reduced, and finally the finished welding wire with a diameter of φ1.2mm is obtained.

Embodiment 2

[0058] Select an austenitic 316L stainless steel strip with a thickness of 0.4mm, a width of 10mm, and a weight of 3545g (see Table 1 for the main components and specifications), roll it into a U shape, and mix 360g of chromium powder, 110g of high-nitrogen ferrochrome, and 25g of electrolytic Manganese metal, 40g molybdenum powder, 5g ferrosilicon, 10g ferrotitanium, 5g aluminum-magnesium alloy, 180g rutile, 10g quartz, 50g zircon sand, 10g potassium feldspar, 30g albite feldspar, 10g fluorite, 5g sodium cryolite, 10g of potassium titanate, 1g of bismuth oxide, 139g of iron powder, 1000g of drug powder in total, see Table 2 for the particle size, baking temperature and time of each drug powder, mix evenly and add to the U-shaped tank, the filling rate is 22.0%, The diameter is reduced, and finally the finished welding wire with a diameter of φ1.6mm is obtained.

Embodiment 3

[0060] Select an austenitic 316L stainless steel strip with a thickness of 0.4mm, a width of 10mm, and a weight of 3444g (see Table 1 for the main components and specifications), roll it into a U shape, and mix 370g of chromium powder, 120g of high-nitrogen ferrochrome, and 27g of electrolytic Manganese metal, 45g molybdenum powder, 7g ferrosilicon, 12g ferrotitanium, 8g aluminum-magnesium alloy, 190g rutile, 15g quartz, 55g zircon sand, 12g potassium feldspar, 33g albite feldspar, 12g fluorite, 8g sodium cryolite, 13g of potassium titanate, 2g of bismuth oxide, 71g of iron powder, 1000g of drug powder in total, see Table 2 for the particle size, baking temperature and time of each drug powder, mix evenly and add to the U-shaped tank, the filling rate is 22.5%, The diameter is reduced, and finally the finished welding wire with a diameter of φ1.6mm is obtained.

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Abstract

The invention discloses a flux-cored wire used for super duplex stainless steel gas shielded welding and a preparation method thereof. The flux-cored wire is composed of an external use steel belt andflux powder, wherein the external use steel belt is made of an austenitic stainless steel belt with 17.0%-18.0% of chromium and 11.0%-12.5% of nickel; and the flux powder comprises the following components of, in percentage by weight, 36.0%-38.0% of chromium powder, 9.0%-13.0% of high-nitrogen chromium iron, 2.5%-3.0% of electrolytic manganese metal, 4.0%-5.0% of molybdenum powder, 0.5%-1.0% of ferrosilicon, 1.0%-1.5% of ferrotitanium, 0.5%-1.0% of aluminum-magnesium alloy, 18.0%-20.0% of rutile, 1.0%-2.0% of quartz, 5.0%-6.0% of zircon sand, 1.0%-1.5% of potassium feldspar, 3.0%-3.5% of albite, 1.0%-1.5% of fluorite, 0.5%-1.0% of sodium cryolite, 1.0%-1.5% of potassium titanate, 0.1%-0.3% of bismuth oxide and the balance iron powder. According to the flux-cored wire used for super duplexstainless steel gas shielded welding and the preparation method thereof, the components and the two-phase proportion of deposited metal can be balanced, thus obtaining a duplex stainless steel welding joint which is good in forming quality and excellent in corrosion resistance.

Description

technical field [0001] The invention relates to a flux-cored welding wire for super duplex stainless steel gas shielded welding and a preparation method thereof, belonging to the welding field of material processing engineering. Background technique [0002] Duplex stainless steel is the "key special steel variety" for the development of my country's iron and steel industry. The ferrite phase and austenite phase in the microstructure each account for about 50%, so that it has both the excellent toughness of austenitic stainless steel and the ferrite phase. The high strength and chloride ion corrosion resistance of solid stainless steel have been more and more widely used in marine structures, petrochemicals, fresh water purification and other fields. [0003] The development of duplex stainless steel has gone through three generations. The first generation of duplex stainless steel is represented by 3RE60 steel developed in Sweden in the mid-1960s, which can be used in chlor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/12B23K35/40
CPCB23K35/0266B23K35/308B23K35/40
Inventor 张迪王英杰马德志谢琦
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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