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Flux-cored wire for 9Ni steel gas shielded welding and welding metal

A technology of weld metal and flux-cored wire, applied in metal processing equipment, welding medium, welding equipment, etc., can solve the problems of increasing high-temperature crack sensitivity of nickel-based weld metal, affecting the quality of welded joints, and reducing low-temperature toughness, etc. , to achieve the effects of narrowing the brittle transition temperature range, stable and reliable welding quality, and good surface quality of the weld bead

Inactive Publication Date: 2016-06-08
HAINING RUIAO METAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with other welding methods, the gas-shielded welding joints of flux-cored wires contain higher oxygen content, which will increase the high-temperature crack sensitivity of the nickel-based weld metal and reduce the low-temperature toughness, thereby affecting the quality of the welded joints. , which limits the application of flux-cored wire gas shielded welding in 9Ni steel
[0005] So far, there are few reports on the application of flux-cored wire for gas-shielded welding of 9Ni steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A metal skin with a thickness of 0.8mm is used, and its chemical composition contains: C0.01%, Ni52%, S0.003%, P0.006%, and the balance is unavoidable impurities.

[0036] The powder includes: 24% molybdenum powder, 19% ferrochrome, 5.5% ferromanganese powder, 4.5% ferrotitanium powder, 2.1% potassium fluoride, 1.1% sodium carbonate, 0.8% potassium oxide, and the rest is Fe and other alloys.

[0037] After filling, coiling and drawing, it becomes a welding wire with a diameter of 1.2mm.

[0038] The base material of the test is 9Ni steel plate with a thickness of 20mm, its yield strength is 588MPa, tensile strength is 726MPa, and the impact energy at -196°C is 122J.

[0039] The above-mentioned welding wire and base metal were used to carry out the welding crack sensitivity evaluation test, and the specific parameters were as follows:

[0040] (1) The welding groove is V-shaped on one side, the angle is 60°, the blunt edge is 10mm, and the groove gap is 2mm;

[0041] ...

Embodiment 2

[0045] A metal skin with a thickness of 0.8mm is used, and its chemical composition contains: C0.01%, Ni60%, S0.003%, P0.006%, Cr18%, and the balance is unavoidable impurities.

[0046] The medicinal powder includes: 20% molybdenum powder, 8% ferrochrome, 6.5% ferromanganese powder, 6% ferro-titanium powder, 2.4% potassium fluoride, 0.9% sodium carbonate, 0.9% potassium oxide, 3.5% titanium dioxide, and the rest is other alloy.

[0047] After filling, coiling and drawing, it becomes a welding wire with a diameter of 1.2mm.

[0048]The test base material is 30mm thick 9Ni steel plate, its yield strength is 585MPa, tensile strength is 726MPa, elongation is 21%, and impact energy at -196°C is 128J.

[0049] The gas shielded welding process is adopted, the welding groove is double-sided V-shaped, the angle is 40°, no preheating, the interlayer temperature is ≤200°C, vertical upward welding, multi-pass multi-layer welding; welding current 170A, welding speed 7.8cm / min , the prote...

Embodiment 3

[0053] A metal skin with a thickness of 0.6mm is used, and its chemical composition contains: C0.015%, Ni55%, S0.004%, P0.007%, Cr6%, Mn1.6%, and the balance is Fe and unavoidable impurities;

[0054] The medicinal powder includes: 23% of molybdenum powder, 10% of ferrochrome, 3.5% of ferromanganese powder, 9.0% of ferrotitanium powder, 3.8% of potassium fluoride, 0.6% of sodium carbonate, 1.2% of potassium oxide, 3.2% of titanium dioxide, and the rest is other alloy.

[0055] After filling, coiling and drawing, it becomes a welding wire with a diameter of 1.2mm.

[0056] The test base material is 38mm thick 9Ni steel plate, its yield strength is 576MPa, tensile strength is 718MPa, and the impact energy at -196℃ is 138J.

[0057] The gas shielded welding process is adopted, the welding groove is double-sided V-shaped, the angle is 45°, no preheating, the interlayer temperature is ≤200°C, vertical downward welding, multi-pass multi-layer welding; welding current 165A, welding ...

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Abstract

The invention discloses a flux-cored wire for 9Ni steel gas shielded welding and welding metal. The flux-cored wire is composed of a metal skin and inner powder. The powder comprises, by weight, 5-25% of molybdenum powder, 5-20% of ferrochromium, 0.50-10.0% of ferromanganese powder, 1.0-10% of ferrotitanium powder, 1.0-10% of potassium fluoride, 0.2-1.5% of sodium carbonate, 0.1-1.5% of potassium oxide, and the balance other alloy. The welding metal prepared by Ar+CO2 mixed shielding gas shielded welding and used for a welding connector comprises 0-0.05% of C, 0.05-0.25% of Si, 1.0-3.5% of Mn, 0-0.008% of P, 0-0.005% of S, 5-15% of Cr, 5-20% of Mo, 5-12% of Fe, 0-0.01% of Nb, and the balance Ni. The tensile strength of the welding metal is greater than or equal to 700 MPa, and the impact toughness of the welding metal at minus 196 DEG C is greater than or equal to 100J.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a flux-cored welding wire and weld metal for gas shielded welding of low-temperature 9Ni steel. Background technique [0002] With the gradual reduction of traditional fossil energy resources, clean energy represented by liquefied natural gas (LNG) has received widespread attention, and its proportion in the energy consumption structure has gradually increased, thus driving the development of LNG storage and transportation equipment. LNG storage tanks are generally used at a low temperature of -162°C, and the tanks used for storage are usually made of 9Ni steel. [0003] At present, in the construction of tanks, manual arc welding, TIG and submerged arc welding are generally used for the construction and welding of 9Ni steel. The manual welding rods have four grades of American Standard AWS5. There are two grades of submerged arc welding wire, AWSA5.14NiCrMo-3 and NiMo-8. [00...

Claims

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Application Information

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IPC IPC(8): B23K35/30
Inventor 潘登
Owner HAINING RUIAO METAL TECH CO LTD
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