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Flux-cored wire for titanium- or niobium-contained austenitic stainless steel welding

A niobium austenite and stainless steel technology, applied in the welding field of material processing engineering, can solve the problems of stainless steel component failure, weld stress concentration, reduce the strength of welded joints and corrosion resistance, etc., to reduce oxidation burning loss, weld seam The effect of good forming quality and excellent welding process performance

Inactive Publication Date: 2015-05-27
CHINA JINGYE ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the quality of weld formation is poor, it will easily lead to weld stress concentration, reduce the strength and corrosion resistance of welded joints, and cause failure of stainless steel components

Method used

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  • Flux-cored wire for titanium- or niobium-contained austenitic stainless steel welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Select thickness 0.4mm, width 10mm, the austenitic stainless steel strip 304L that weight is 3762g, it is rolled into U shape, with 150g chromium powder, 95g nickel powder, 40g ferroniobium, 40g electrolytic manganese, 15g silicon-calcium alloy powder (calcium content is 58%, silicon content is 34%), 100g rutile, 35g quartz, 150g zircon sand, 60g feldspar, 15g cryolite, 5g lithium carbonate, 5g bismuth oxide, 290g iron powder, totally 1000g medicine powder, after mixing evenly Put it into the U-shaped groove, the filling rate is 21%. After the joint is closed, it is rolled and reduced, bright annealed, and drawn and reduced. The final diameter of the finished welding wire is 0.9mm.

Embodiment 2

[0045] Select thickness 0.4mm, width 10mm, the austenitic stainless steel strip 304L that weight is 3762g, it is rolled into U shape, with 180g chromium powder, 110g nickel powder, 50g niobium iron, 60g electrolytic manganese, 30g silicon-calcium alloy powder (calcium content is 56%, silicon content is 32%), 150g rutile, 50g quartz, 200g zircon sand, 110g feldspar, 25g cryolite, 10g lithium carbonate, 8g bismuth oxide, 17g iron powder, altogether 1000g medicine powder, after mixing evenly Add it into the U-shaped groove with a filling rate of 21%. After the joint is closed, it is rolled and reduced, bright annealed, and drawn and reduced. The final diameter of the finished welding wire is 1.2mm.

Embodiment 3

[0047] Select thickness 0.4mm, width 10mm, the austenitic stainless steel strip 304L that weight is 3762g, it is rolled into U shape, with 180g chromium powder, 110g nickel powder, 50g niobium iron, 60g electrolytic manganese, 30g silicon-calcium alloy powder (calcium content is 58%, silicon content is 35%), 150g rutile, 50g quartz, 200g zircon sand, 60g feldspar, 25g cryolite, 10g lithium carbonate, 8g bismuth oxide, 67g iron powder, altogether 1000g medicine powder, after mixing evenly Put it into the U-shaped groove, the filling rate is 21%. After the joint is closed, it is rolled and reduced, bright annealed, and drawn and reduced. The final diameter of the finished welding wire is 0.9mm.

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Abstract

A flux-cored wire for titanium- or niobium-contained austenitic stainless steel welding comprises welding flux powder and an external-use stainless steel band. A flux core accounts for 21.0-25.0% of the total weight of the flux-cored wire. The flux core comprises, by weight percentage, 15.0-18.0% of chromium powder, 9.5-11.0% of nickel powder, 4.0-5.0% of ferroniobium, 4.0-6.0% of electrolytic manganese, 1.0-3.0% of silicon-calcium alloy powder, 10.0-15.0% of rutile, 3.5-5.0% of quartz, 15.0-20.0% of zircon sand, 6.0-11.0% of feldspar, 1.5-2.5% of cryolite, 0.5-1.0% of lithium carbonate, 0.5-0.8% of bismuth oxide, and the balance of iron powder. In the flux core, the proportion of the content sum of titanium dioxide and zirconium dioxide to the content of silicon dioxide is 1.5-2.0; the proportion of the content of manganese powder to that of silicon-calcium alloy powder is 2.0-3.0. The external-use stainless steel band is austenitic stainless steel band 304L with carbon content lower than 0.02wt%. The diameter of the flux-cored wire is 0.9-1.2mm. By the flux-cored wire with good welding process property, all-position welding of titanium- or niobium-contained austenitic stainless steel can be achieved.

Description

technical field [0001] The invention relates to a flux-cored welding wire for welding austenitic stainless steel containing titanium or niobium, which belongs to the welding field of material processing engineering. Background technique [0002] Stainless steel is widely used in petroleum, chemical industry, machinery, electric power and other industries due to its excellent corrosion resistance, among which austenitic stainless steel is the most widely used, and the most typical austenitic stainless steel is 304 stainless steel, containing 18wt% Cr and 8wt% Ni , other austenitic stainless steels are derived on the basis of 304 stainless steel. [0003] 304 stainless steel has excellent corrosion resistance in the atmosphere and other medium environments, but the welding or heat treatment process will change its structure or stress state, increase the sensitivity of stainless steel to corrosion damage, produce intergranular corrosion, pitting corrosion, etc., among which int...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/368
Inventor 张迪王英杰刘景凤符定梅周德成张赫李杨白波
Owner CHINA JINGYE ENG TECH CO LTD
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