Nitrogen-containing austenitic stainless steel flux-cored wire with high strength and pitting corrosion resistance, and preparation method

A technology of austenitic stainless steel and flux-cored welding wire, which is used in welding equipment, manufacturing tools, welding media, etc., can solve the problem of difficulty in exerting nitrogen-containing austenitic stainless steel, reducing the yield and quality of welding wire, and high sensitivity to welding porosity defects. problems, to achieve the effect of inhibiting the escape of nitrogen elements, optimizing the bonding force, and stabilizing the welding process

Active Publication Date: 2021-06-22
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is a lack of special welding wire for nitrogen-containing austenitic stainless steel welding, and conventional austenitic stainless steel welding wire is often used instead, such as commercial ER308L austenitic stainless steel welding wire (no nitrogen), the weld strength is only 70-80% of the base metal , the sensitivity of welding porosity is high, the pitting corrosion resistance is significantly reduced, and it is difficult to take advantage of the advantages of nitrogen-containing austenitic stainless steel
In addition, nitrogen-containing austenitic stainless steel has a high work hardening rate, which makes it difficult to draw the welding wire, which reduces the yield and quality of the welding wire

Method used

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  • Nitrogen-containing austenitic stainless steel flux-cored wire with high strength and pitting corrosion resistance, and preparation method
  • Nitrogen-containing austenitic stainless steel flux-cored wire with high strength and pitting corrosion resistance, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] High-strength and pitting-resistant nitrogen-containing austenitic stainless steel flux-cored welding wire is composed of flux core powder and stainless steel strip wrapped around the flux core powder. The flux core powder is composed of alloy components and slag components, as follows:

[0044] The mass percentages of each substance in the slag component to the drug core powder are: sodium titanate and potassium titanate: 7%, zirconia: 5%, ferric oxide: 3%, fluoride: 8.8%, potassium feldspar : 1%, rutile: 12%, bismuth oxide: 10% and aluminum powder 1%.

[0045] The mass percentage of each substance in the alloy component to the drug core powder is: electrolytic manganese: 1.8%, ferrosilicon: 0.7%, chromium powder: 20%, nickel powder: 12.5%, ferromolybdenum: 0.2%, copper powder: 2.0% , chromium nitride: 1.5% mixed with iron powder as the balance;

[0046] The particle size of each substance in the drug core powder is 60-180 mesh.

[0047] The mass percent composition ...

Embodiment 2

[0055] High-strength and pitting-resistant nitrogen-containing austenitic stainless steel flux-cored welding wire is composed of flux core powder and stainless steel strip wrapped around the flux core powder. The flux core powder is composed of alloy components and slag components, as follows:

[0056] The mass percentages of the various substances in the slag components in the drug core powder are: sodium titanate and potassium titanate 6%, zirconia: 2%, ferric oxide: 4%, fluoride: 5.5%, potassium feldspar: 3%, rutile: 12%, bismuth oxide: 1.4% and aluminum powder 2%.

[0057] The mass percentages of the substances in the alloy components in the core powder are: electrolytic manganese: 3.0%, ferrosilicon: 1%, chromium powder: 21%, nickel powder: 15.5%, molybdenum iron: 3.5%, chromium nitride: 0.2 %, copper powder: 0.1% mixed with iron powder as the balance.

[0058] The particle size of each substance in the drug core powder is 60-180 mesh.

[0059] The mass percent composit...

Embodiment 3

[0067] High-strength and pitting-resistant nitrogen-containing austenitic stainless steel flux-cored welding wire is composed of flux core powder and stainless steel strip wrapped around the flux core powder. The flux core powder is composed of alloy components and slag components, as follows:

[0068] The mass percentages of the various substances in the slag components in the drug core powder are: sodium titanate and potassium titanate 6%, zirconia: 2%, ferric oxide: 4%, fluoride: 5.5%, potassium feldspar: 3%, rutile: 12%, bismuth oxide: 1.4% and aluminum powder 2%.

[0069] The mass percentage of each substance in the alloy component to the core powder is: electrolytic manganese: 3%, ferrosilicon: 1%, chromium powder: 21%, nickel powder: 20%, molybdenum iron: 3.5%, copper powder: 0.1% , chromium nitride 5% and iron powder as the balance mixed.

[0070] The particle size of each substance in the drug core powder is 60-180 mesh.

[0071] The mass percent composition of the ...

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Abstract

The invention discloses a nitrogen-containing austenitic stainless steel flux-cored wire with high strength and pitting corrosion resistance. The flux-cored wire is composed of flux-cored powder and a stainless steel band wrapping the flux-cored powder, and is characterized in that the flux-cored powder is composed of alloy components and slag system components, and the alloy components of the flux-cored powder comprise, by mass, 1.5wt%-3wt% of electrolytic manganese, 0.5wt%-1wt% of silicon iron, 20wt%-22 wt% of chromium powder, 12.5wt%-20wt% of nickel powder, 0.2wt%-3.5 wt% of ferromolybdenum, 0.1wt%-2.0 wt% of copper powder, 0.1wt%-5wt% of chromium nitride and the balance iron powder and inevitable impurities. According to the flux-cored wire, the design scheme of multi-element composite slag system coupling protection is adopted, and escape of the nitrogen element in the welding process of nitrogen-containing austenitic stainless steel is inhibited while the weldability is not affected and the welding process difficulty is not increased.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a high-strength pitting-resistant nitrogen-containing austenitic stainless steel flux-cored welding wire and a preparation method thereof. Background technique [0002] Nitrogen-containing austenitic stainless steel is a resource-saving low-cost austenitic stainless steel that uses nitrogen instead of expensive nickel as an austenite stabilizing element. Nitrogen-containing austenitic stainless steel has excellent strength, toughness and corrosion resistance, and has been widely used in aviation industry, construction industry, petrochemical industry, marine engineering and other fields in recent years. [0003] Nitrogen-containing austenitic stainless steel involves a large number of welding processes in practical application. Nitrogen-containing austenitic stainless steel often faces the problem of nitrogen escape and pore defects in the weld metal during welding: during the w...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3086B23K35/40Y02P10/20
Inventor 柏关顺明珠甄立玲王伟李奎雨魏庆忠李金娥
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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