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Full-position soldering biphase stainless steel flux-cored wire

A technology of duplex stainless steel and flux-cored wire, which is applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as pitting corrosion and impact toughness of joints, and achieve good pitting resistance, welding Beautiful seam formation and easy slag removal

Inactive Publication Date: 2008-03-05
栗卓新
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when welding duplex stainless steel, the use of traditional austenitic stainless steel welding consumables cannot meet the requirements of joint pitting and impact toughness, let alone duplex stainless steel flux-cored wire with all-position welding performance

Method used

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  • Full-position soldering biphase stainless steel flux-cored wire

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Experimental program
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Embodiment

[0028] 1. Use 8×0.25 (width 8mm, thickness 0.25mm) 304L stainless steel strip. Roll it into a U shape first. Get 35 grams of metal chromium powder, 13 grams of metal molybdenum powder, 3 grams of metal nickel powder, 5 grams of metal manganese powder, 4 grams of aluminum-magnesium alloy powder, 1 gram of cryolite powder, 4 grams of quartz powder, 1 gram of zircon powder, Feldspar powder 4 grams, rutile powder 24 grams, Al 2 o 3 Powder 2.5g, Bi 2 o 3 1.5 grams of powder, 2 grams of manganese nitride powder. (The particle size of the powder taken is that it can pass through an 80-mesh sieve). The various powders taken were put into a powder mixer and mixed for 40 minutes, and then the mixed powder was added into a U-shaped 304L stainless steel belt groove, and the filling rate was 17%. Close the U-shaped groove so that the powder is wrapped in it. Then make it pass through drawing dies with diameters of 2.3mm, 2.1mm, 1.9mm, 1.7mm, 1.6mm, 1.5mm, 1.4mm, 1.3mm, 1.18mm, draw ...

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Abstract

The flux cored wire for all position welding of two-phase stainless steel has flux core comprising metal Cr powder 35-40 wt%, metal Mo powder 11-15 wt%, metal Ni powder 2-4 wt%, metal Mn powder 3-5 wt%, Al-Mg alloy 2-5 wt%, cryolite 1-4 wt%, quartz 4-9 wt%, feldspar 2-8 wt%, rutile 21-30 wt%, Al2O30.5-4 wt%, zirconite 1-5 wt%, Bi2O30.5-3 wt%, and manganese nitride 0.5-3 wt%. Welding two-phase stainless steel with flux cored wire can form weld seam with excellent corrosion resisting performance and high impact toughness, and the flux cored wire has excellent welding performance and all position welding adaptability.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and is mainly applied to the welding of 2205 duplex stainless steel all-position process widely used in fields such as natural gas and oil pipelines, offshore platforms, chemicals, heat exchangers, and pressure vessels. Background technique [0002] Traditional austenitic stainless steel has insufficient resistance to local corrosion such as stress corrosion, pitting corrosion and crevice corrosion, especially the fracture caused by pitting corrosion and stress corrosion, which is extremely harmful. Duplex Stainless Steels (DSS for short) combines the advantages of both austenitic stainless steel and ferritic stainless steel, and has excellent neutral chloride stress corrosion resistance, good pitting corrosion resistance and crevice corrosion resistance. ability, but also has good toughness, strength and weldability. Moreover, the nickel content in this type of steel is...

Claims

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Application Information

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IPC IPC(8): B23K35/22B23K35/32B23K35/368
Inventor 栗卓新李伟李国栋魏琪
Owner 栗卓新
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