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Gas shielding type flux-cored wire for 18Ni250 stainless steel and preparation method thereof

A technology of flux-cored welding wire and stainless steel, applied in welding equipment, welding medium, manufacturing tools, etc., to achieve the effect of beautiful weld shape, simple preparation method and high production efficiency

Inactive Publication Date: 2017-10-20
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are only a few reports on the welding process of 18Ni250 martensitic stainless steel, and there is no report on the welding materials for its fusion welding connection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] The preparation method of gas-shielded flux-cored welding wire for 18Ni250 stainless steel, the specific steps are as follows:

[0042] Step 1: Weigh cobalt powder 12.0%-14.0%, nickel powder 9.0%-12.0%, molybdenum powder 8.0%-10.0%, electrolytic aluminum powder 0.5%-0.1%, rutile powder 20.0%-23.0% according to mass percentage , titanium dioxide 4.0%-7.0%, dolomite powder 5%-7%, ilmenite powder 3.0%-5.0%, titanium iron powder 9.0%-11.0%, lime clay powder 9.0%-11.0%, mica powder 5%- 7%, the rest is iron powder, the sum of the mass percentages of the above components is 100%;

[0043] Step 2: Mix the titanium dioxide powder, dolomite powder, ilmenite powder, lime clay powder and mica powder weighed in step 1 to obtain mixed drug powder A, add water glass binder to mixed drug powder A and mix evenly, then place in Sinter in a heating furnace at 750°C for 4-6 hours, crush and pass through a 60-140 mesh sieve to obtain mixed powder B;

[0044] Step 3: Mix the molybdenum powde...

Embodiment 1

[0048] Step 1: Weigh 120.0g of cobalt powder, 100.0g of nickel powder, 100.0g of molybdenum powder, 1.0g of electrolytic aluminum powder, 200.0g of rutile powder, 40.0g of titanium dioxide, 50.0g of dolomite powder, 40.0g of ilmenite powder, titanium Iron powder 100.0g, lime clay powder 100.0g, mica powder 60.0g, iron powder 89.0g.

[0049] Step 2: Mix the titanium dioxide powder, dolomite powder, ilmenite powder, lime clay powder and mica powder weighed in step 1 to obtain mixed drug powder A, add 180g of water glass binder to mixed drug powder A and mix evenly, then place Sinter in a heating furnace at 750°C for 4 hours, crush and pass through a 60-140 mesh screen to obtain mixed powder B;

[0050] Step 3: Mix the molybdenum powder, nickel powder, cobalt powder, electrolytic aluminum powder, iron powder, rutile powder and ilmenite powder weighed in step 1 with the mixed powder B obtained in step 2, and place in a drying furnace Dry at 220°C for 2 hours to obtain core powder...

Embodiment 2

[0054] Step 1: Weigh 130.0g of cobalt powder, 110.0g of nickel powder, 90.0g of molybdenum powder, 3.0g of electrolytic aluminum powder, 220.0g of rutile powder, 60.0g of titanium dioxide, 60.0g of dolomite powder, 40.0g of ilmenite powder, titanium Iron powder 90.0g, lime clay powder 90.0g, mica powder 70.0g, iron powder 37.0g.

[0055] Step 2: Mix the titanium dioxide powder, dolomite powder, ilmenite powder, lime clay powder and mica powder weighed in step 1 to obtain mixed drug powder A, add 180g of water glass binder to mixed drug powder A and mix evenly, then place Sinter in a heating furnace at 750°C for 5 hours, crush and pass through a 60-140 mesh screen to obtain mixed powder B;

[0056] Step 3: Mix the molybdenum powder, nickel powder, cobalt powder, electrolytic aluminum powder, iron powder, rutile powder and ilmenite powder weighed in step 1 with the mixed powder B obtained in step 2, and place in a drying furnace Dry at 220°C for 2 hours to obtain core powder; ...

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Abstract

The invention discloses a gas shielding type flux-cored wire for 18Ni250 maraging stainless steel. The gas shielding type flux-cored wire comprises a flux core and weld fold, wherein the flux core is prepared from, by mass percentage, 12.0-14.0% of cobalt powder, 9.0-12.0% of nickel powder, 8.0-10.0% of molybdenum powder, 0.5-0.1% of electrolytic aluminum powder, 20.0-23.0% of rutile powder, 4.0-7.0% of titanium dioxide powder, 5-7% of dolomite powder, 3.0-5.0% of ilmenite powder, 9.0-11.0% of ferrotitanium powder, 9.0-11.0% of white mud powder, 5-7% of mica powder and the balance of iron powder, and the sum of mass percentage of the components is 100%. The invention discloses a preparation method of the gas shielding type flux-cored wire for the 18Ni250 maraging stainless steel. The flux-cored wire has beautiful weld formation and can obtain the microstructure of weld of martensitic stainless steel, and a welded joint has good mechanical properties and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metal material welding, and in particular relates to a gas-shielded flux-cored welding wire for 18Ni250 stainless steel, and also relates to a preparation method of the welding wire. Background technique [0002] Martensite refers to the body-centered cubic metastable phase transformed by austenite through non-diffusion phase transformation. It is an interstitial solid solution in which carbon is supersaturated in iron. Its original structure is martensite, which is strengthened by aging. iron-nickel alloy. Different from other steel types, maraging stainless steel is an ultra-high-strength stainless steel obtained through the superposition of two strengthening effects of low-carbon martensitic transformation and aging strengthening. This steel not only has all the advantages of maraging steel, but also has corrosion resistance properties that other maraging steels do not have, and improves some properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3093B23K35/0266B23K35/406
Inventor 张敏程康康王裕李乐慕二龙史杰周玉兰
Owner XIAN UNIV OF TECH
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