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Submerged-arc welding flux capable of welding nitrogen-controlled and non-nitrogen-controlled ultralow-temperature austenitic stainless steel

An austenitic stainless steel, ultra-low temperature technology, used in welding equipment, welding media, welding/cutting media/materials, etc., to achieve the effects of excellent weld performance, beautiful weld formation, and excellent weld mechanical properties

Active Publication Date: 2020-04-10
ATLANTIC CHINA WELDING CONSUMABLES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain good mechanical properties, especially good ultra-low temperature impact toughness (-196°C), in recent years, according to market demand and cost requirements, relevant welding consumable manufacturers are developing and improving austenitic stainless steel welding consumables. Especially the research on submerged arc welding, because the welding of austenitic stainless steel in the early stage mainly used foreign and welding rod welding consumables, submerged arc welding is in a blank stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] SiO 2 5kg, MgO 3kg, Al 2 o 3 25kg, CaF 2 50kg, CeO 0.4kg, Mo 2 o 3Add 1.5kg, S 0.008kg, P0.015kg of powder into the mixer, stir and mix evenly, stir for more than 20 minutes, then add 18kg of sodium water glass to mix and adjust the powder, after baking, high-temperature sintering, and sieving, that is A flux with an alkalinity of 3.03 is obtained. With special welding wire for submerged arc welding, the process performance is excellent. The performance of the weld seam is as follows: the tensile strength of the welded joint under the welding condition is 520Mpa, and the Charpy impact energy of the weld seam is Akv (-196°C) = 85-90J ;The tensile strength of the welded joint is 525Mpa under the condition of 570℃ / 1h heat treatment, the Charpy impact energy of the weld is Akv(-196℃)=88-97J, the weld metal S=0.008%, P=0.011%, the weld metal No cracks.

Embodiment 2

[0035] SiO 2 8kg, MgO 6kg, Al 2 o 3 35kg, CaF 2 55kg, CeO 0.3kg, Mo 2 o 3 Add 2.5kg, S 0.009kg, P0.016kg of powder into the mixer, stir and mix evenly, stir for more than 20 minutes, then add 20kg of sodium water glass to mix and adjust the powder, after baking, high-temperature sintering, and sieving, that is A flux with an alkalinity of 2.39 is obtained. With special welding wire for submerged arc welding, the process performance is excellent. The performance of the weld seam is as follows: the tensile strength of the welded joint under the welding condition is 515Mpa, and the Charpy impact energy of the weld seam is Akv (-196°C) = 80-92J ;The tensile strength of the welded joint under the heat treatment condition of 570℃ / 1h is 521Mpa, the Charpy impact energy of the weld is Akv(-196℃)=85-93J, the weld metal S=0.0075%, P=0.012%, the weld metal no cracks;

Embodiment 3

[0037] SiO 2 4kg, MgO 2kg, Al 2 o 3 30kg, CaF 2 45kg, CeO 0.6kg, Mo 2 o 3 Add 2.0kg, S 0.006kg, P0.015kg of powder into the mixer, stir and mix evenly, stir for more than 20 minutes, then add 20kg of sodium water glass to mix and adjust the powder, after baking, sintering at high temperature, and sieving, that is A flux with an alkalinity of 3.45 is obtained. With special welding wire for submerged arc welding, the process performance is excellent. The performance of the weld seam is as follows: the tensile strength of the welded joint under the welding condition is 530Mpa, and the Charpy impact energy of the weld seam is Akv (-196°C) = 88-96J ;The tensile strength of the welded joint under the heat treatment condition of 570°C / 1h is 533Mpa, the Charpy impact energy of the weld is Akv(-196°C)=90-107J, the weld metal S=0.0077%, P=0.011% weld metal without crack;

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Abstract

The invention discloses a submerged-arc welding flux capable of welding nitrogen-controlled and non-nitrogen-controlled ultralow-temperature austenitic stainless steel. The submerged-arc welding fluxcomprises the following components of, in parts by weight, 3 to 8 parts of SiO2, 1 to 8 parts of MgO, 20 to 40 parts of Al2O3, 40 to 60 parts of CaF2, more than 0 and less than or equal to 1.0 part ofCeO, more than or equal to 1 and less than or equal to 3 parts of Mo2O3, more than 0 and less than 0.010 part of S, and more than 0 and less than 0.020 part of P. Compared with the prior art, the welding flux has the advantages that the welding manufacturability is good, deslagging is excellent, forming is attractive, the anti-cracking performance is good, the mechanical performance is more excellent, along with the addition of the CeO and the Mo2O3, the weld joint forming is attractive, the mechanical performance is more stable; and the nitrogen-controlled and non-nitrogen-controlled ultralow-temperature austenitic stainless steel is welded through the submerged-arc welding flux, an austenitic structure with good anti-cracking performance is obtained, and the ultralow-temperature performance is excellent.

Description

technical field [0001] The invention relates to the field of welding, in particular to a nitrogen-controlled and non-nitrogen-controlled ultra-low temperature austenitic stainless steel submerged arc welding flux and a preparation method. Background technique [0002] Austenitic stainless steel refers to stainless steel with austenitic structure at room temperature, and has a stable austenitic structure. Austenitic stainless steel is non-magnetic and has high toughness and plasticity, but its strength is low. It is impossible to strengthen it through phase transformation, and it can only be strengthened by cold working. Due to the slightly poor crack resistance of austenitic stainless steel, in recent years, in Under ultra-low temperature conditions, nickel-based welding consumables are mainly used for welding. More and more design departments and units hope to have a material that can replace nickel-based materials and have high impact toughness in welded and heat-treated s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/36B23K35/362
CPCB23K35/3605B23K35/362
Inventor 毛兴贵杨飞曾志超
Owner ATLANTIC CHINA WELDING CONSUMABLES
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