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

A duplex stainless steel and gas shielding technology, which is applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem that the chemical composition of the weld metal and the ratio of the two phases are difficult to accurately control, the corrosion resistance is reduced, and the impact is relatively large. Large and other problems, to achieve the effect of excellent welding process performance and good weld forming quality

Active Publication Date: 2019-08-20
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 used for super duplex stainless steel gas shielded welding and preparation method thereof
  • Flux-cored wire used for super duplex stainless steel gas shielded welding and preparation method thereof
  • Flux-cored wire used for super duplex stainless steel gas shielded welding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Select 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, 380g of chromium powder, 125g of high nitrogen ferrochromium, 30g of electrolytic Metal manganese, 50g molybdenum powder, 10g ferrosilicon, 15g titanium iron, 10g aluminum magnesium alloy, 200g rutile, 20g quartz, 60g zircon sand, 15g potassium feldspar, 35g albite, 15g fluorite, 10g sodium cryolite, 15g potassium titanate, 3g bismuth oxide, 7g iron powder, a total of 1000g powder, the particle size, baking temperature and time of each powder are shown in Table 2, after mixing evenly, add it to the U-shaped tank, the filling rate is 23.0%, after a long time The diameter is reduced, and the finished welding wire with a diameter of φ1.2mm is finally obtained.

Embodiment 2

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

Embodiment 3

[0060] Select austenitic 316L stainless steel strip with a thickness of 0.4mm, a width of 10mm and a weight of 3444g (the main components and specifications are shown in Table 1), rolled into a U shape, 370g of chromium powder, 120g of high nitrogen ferrochromium, 27g of electrolytic Metal manganese, 45g molybdenum powder, 7g ferrosilicon, 12g titanium iron, 8g aluminum-magnesium alloy, 190g rutile, 15g quartz, 55g zircon sand, 12g potassium feldspar, 33g albite, 12g fluorite, 8g sodium cryolite, 13g potassium titanate, 2g bismuth oxide, 71g iron powder, a total of 1000g powder, the particle size, baking temperature and time of each powder are shown in Table 2. After mixing evenly, add it to the U-shaped tank with a filling rate of 22.5%. The diameter is reduced, and the finished welding wire with a diameter of φ1.6mm is finally 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 super duplex stainless steel gas shielded welding flux-cored welding wire 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" in the development of my country's iron and steel industry. The ferrite phase and austenite phase in the microstructure each account for about 50%, which makes it not only have the excellent toughness of austenitic stainless steel, but also have ferrite. The high strength and resistance to chloride ion corrosion of stainless steel are more and more widely used in marine structure, petrochemical industry, 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, represented by 3RE60 steel developed in Sweden in the mid-1960s, can be used in chloride i...

Claims

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Application Information

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Patent Type & Authority Applications(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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