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Welding nitrogen-controlled or non-nitrogen-controlled ultra-low temperature austenitic stainless steel submerged arc welding flux and preparation method

A technology of austenitic stainless steel and welding method, applied in welding equipment, welding medium, welding/cutting medium/material, etc., to achieve the effects of excellent weld performance, beautiful weld shape, and excellent weld mechanical properties

Active Publication Date: 2022-04-05
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, S0.008kg, P0.015kg 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, S0.009kg, P0.016kg 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, S0.006kg, P0.015kg 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 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 nitrogen-controlled or non-nitrogen-controlled ultra-low temperature austenitic stainless steel submerged arc welding flux, which is made of the following components: SiO 2 3-8 parts by weight, MgO 1-8 parts by weight, Al 2 o 3 20‑40 parts by weight, CaF 2 40‑60 parts by weight, 0<CeO≤1.0 parts by weight, 1≤Mo 2 o 3 ≤3 parts by weight, 0<S≤0.010 parts by weight and 0<P≤0.020 parts by weight. Compared with the existing ones, the present invention has good welding processability, excellent slag removal, beautiful appearance, good crack resistance and better mechanical properties. 2 o 3 The addition of the weld seam has beautiful appearance and more stable mechanical properties. The flux of the invention welds a nitrogen-controlled or non-nitrogen-controlled ultra-low temperature austenitic stainless steel to obtain an austenite structure with better crack resistance and excellent ultra-low temperature performance.

Description

technical field [0001] The invention relates to the field of welding, in particular to a nitrogen-controlled or 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 st...

Claims

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Application Information

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Patent Type & Authority Patents(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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