Flux-cored wire for welding Cr-Ni austenitic stainless steel and preparation method of flux-cored wire

A technology of austenitic stainless steel and flux-cored wire, applied in welding equipment, welding medium, welding/cutting medium/material, etc., can solve the problem of low efficiency of manual argon tungsten arc welding, being easily affected by the operation level, and poor welding quality Stability and other issues, to achieve good welding process adaptability, good toughness, high deposition efficiency

Active Publication Date: 2021-09-07
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a welded joint with small residual stress, mechanical properties and corrosion resistance equivalent to the base metal has been obtained, the welding cost is too high due to the low efficiency, long time, high requirements for welders and being easily affected by the operation level of manual argon tungsten arc welding. High, unstable welding quality and other issues

Method used

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preparation example Construction

[0023] The preparation method of the flux-cored wire for welding chromium-nickel austenitic stainless steel of the present invention comprises the following steps:

[0024] 1) Take Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe, mix them evenly and then dry them to obtain the drug core powder;

[0025] 2) Fill the core powder into the U-shaped groove, then close the opening of the U-shaped groove, and then draw and reduce the diameter one by one through the wire drawing dies with different diameters to obtain the welding wire sample, and finally the surface of the welding wire sample Clean up and get flux cored wire.

[0026] In step 1), the drying temperature is 200° C., and the drying time is 2 hours.

[0027] The U-shaped groove is formed by rolling a 316L stainless steel strip through a forming machine.

[0028] The thickness of 316L stainless steel strip is 0.3mm~0.7mm; the width of 316L stainless steel strip is 8mm~12mm.

[0029] Step 2) The filling rate of the Chinese medic...

Embodiment 1

[0032] The flux-cored wire for welding chromium-nickel austenitic stainless steel described in the present invention is prepared from Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe.

[0033] Prepared by mass percentage of 25% Ni, 25% Cr, 4.5% Cu, 0.75% Mo, 0.65% Si, 0.1% C, 1.5% Nb+Ta, 2.5% Mn and the balance Fe made.

[0034] The thickness of chromium-nickel austenitic stainless steel is 0.3mm-0.7mm, the width of chromium-nickel austenitic stainless steel is 8-12mm, and the chromium-nickel austenitic stainless steel is 316L stainless steel strip.

[0035] The preparation method of the flux-cored wire for welding chromium-nickel austenitic stainless steel of the present invention comprises the following steps:

[0036] 1) Take Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe, mix them evenly and then dry them to obtain the drug core powder;

[0037] 2) Fill the core powder into the U-shaped groove, then close the opening of the U-shaped groove, and then draw and reduce the diameter one by o...

Embodiment 2

[0044] The flux-cored wire for welding chromium-nickel austenitic stainless steel described in the present invention is prepared from Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe.

[0045] Prepared by mass percentage of 20% Ni, 23% Cr, 3.5% Cu, 0.75% Mo, 0.3% Si, 0.05% C, 0.5% Nb+Ta, 1.0% Mn and the balance Fe made.

[0046] The thickness of chromium-nickel austenitic stainless steel is 0.3mm, the width of chromium-nickel austenitic stainless steel is 8mm, and the chromium-nickel austenitic stainless steel is 316L stainless steel strip.

[0047] The preparation method of the flux-cored wire for welding chromium-nickel austenitic stainless steel of the present invention comprises the following steps:

[0048]1) Take Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe, mix them evenly and then dry them to obtain the drug core powder;

[0049] 2) Fill the core powder into the U-shaped groove, then close the opening of the U-shaped groove, and then draw and reduce the diameter one by one through...

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Abstract

The invention discloses a flux-cored wire for welding Cr-Ni austenitic stainless steel and a preparation method of the flux-cored wire. The flux-cored wire is prepared from Ni, Cr, Cu, Mo, Si, C, Nb+Ta, Mn and Fe. The flux-cored wire has the characteristics of high deposition efficiency, high welding stability and high deposition speed, weld metal used for welding the austenitic stainless steel has the mechanical properties of good toughness and high strength, the corrosion resistance effect is good, and meanwhile, the preparation method is simple.

Description

technical field [0001] The invention belongs to the welding field of material processing engineering, and relates to a flux-cored welding wire for welding chromium-nickel austenitic stainless steel and a preparation method thereof. Background technique [0002] The metal wall temperature of the superheater / reheater of the ultra-supercritical thermal power generating unit boiler can reach 650°C at the service temperature, and the pipe is required to have good high-temperature strength, good steam oxidation resistance and flue gas oxidation resistance. At present, the superheater / reheater tubes of ultra-supercritical boilers are widely used in Cr-Ni type austenitic stainless steel. [0003] Due to the high content of Cr and Ni in Cr-Ni type austenitic stainless steel, its weldability problems mainly include: 1) hot crack tendency; 2) stress corrosion tendency; 3) intergranular corrosion tendency. At present, the welding of Cr-Ni type austenitic stainless steel pipes for boile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3066B23K35/40
Inventor 田晓梁碧珂徐慧李芳草张瑞刚
Owner XIAN THERMAL POWER RES INST CO LTD
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