A kind of deposited metal material and preparation method for ultra-low temperature 304l austenitic stainless steel welding

A technology of austenitic stainless steel and deposited metal, applied in the fields of deposited metal material and preparation, and welding material, can solve the problems of reduced ultra-low temperature toughness, reduced ultra-low temperature toughness of deposited metal, waste of resources, etc., and achieves excellent ultra-low temperature toughness, good Economic benefits, good strength effect

Active Publication Date: 2021-12-03
WUHAN YIYE STEEL STRUCTURE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

308L welding consumables usually contain 5-12FN ferrite. The existence of ferrite can effectively prevent hot cracks in the welding process, but it greatly reduces the ultra-low temperature toughness of the deposited metal, especially after heat treatment, the ultra-low temperature toughness will be further improved. decline
The impact energy of 308L welding rod, submerged arc welding wire and flux deposited metal at home and abroad at -196°C is about 33J. After heat treatment, the value will drop to about 15J, which cannot meet the requirements of this project.
[0004] In order to make the impact energy of 304L welded joints after heat treatment not less than 50J at -196°C, nickel-based welding consumables or all-austenitic welding consumables can be used, but these welding consumables are priced above 200 yuan / kg due to their high nickel content. Poor economic benefit and waste of resources

Method used

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  • A kind of deposited metal material and preparation method for ultra-low temperature 304l austenitic stainless steel welding
  • A kind of deposited metal material and preparation method for ultra-low temperature 304l austenitic stainless steel welding
  • A kind of deposited metal material and preparation method for ultra-low temperature 304l austenitic stainless steel welding

Examples

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Embodiment 1

[0026] In this embodiment, three different E308L-XX electrodes are used to weld 304L by arc welding, the welding position is vertical welding, heat treatment is performed at 570°C±10°C×1h after welding, and the diameter of the electrodes is 3.2mm. The brands of the three electrodes, the chemical composition of the deposited metal, and the value of the chromium-nickel equivalent ratio are shown in Table 1, the chemical composition of 304L is shown in Table 2, the welding process parameters are shown in Table 3, and the impact energy of the weld at -196°C is shown in Table 1. 4.

[0027] Comparing Table 1 and Table 4, it can be seen that with the decrease of the chromium-nickel equivalent ratio, the ferrite content in the electrode gradually decreases, and the impact energy of the weld at -196°C gradually increases. When the chromium-nickel equivalent ratio is 1.44, the ferrite content in the weld The body is about 2FN, and the impact energy of the weld at -196°C is 56.7J. It ca...

Embodiment 2

[0037] In this example, three different S F308L FB-S308L submerged arc welding wires and flux combinations are used to weld 304L by submerged arc welding. The welding position is flat welding. After welding, heat treatment is performed at 570°C±10°C×1h, and the diameter of the welding wire is 4.0mm. . The brands of the three submerged arc welding wires and fluxes, the chemical composition of the deposited metal, and the chromium-nickel equivalent ratio are shown in Table 5, the chemical composition of the corresponding flux is shown in Table 6, and the chemical composition of 304L is shown in Table 2 in Example 1 The welding process parameters are shown in Table 7, and the impact energy of the weld at -196 °C is shown in Table 8.

[0038] Comparing Table 5 and Table 8, it can be seen that with the decrease of the chromium-nickel equivalent ratio, the ferrite content in the submerged arc welding wire and the flux deposited metal gradually decreases, and the impact energy of the...

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Abstract

The invention discloses a deposited metal material for ultra-low temperature 304L austenitic stainless steel welding and a preparation method. The deposited metal material is: C: 0.02-0.04%, Si: ≤0.5%, Mn: 1.0-2.5% by weight %, P: ≤0.025%, S: ≤0.015%, Ni: 11.5-12.5%, Cr: 18-19%, Mo: ≤0.1%, Cu: ≤0.75%, and the rest is iron. The deposited metal material is formed by combining submerged arc welding wire and flux through submerged arc welding or welding rods through arc welding. Controlling the chromium-nickel equivalent ratio ≤ 1.45 in the process of welding material selection can make the designed electrode and submerged arc welding wire deposited metal have a reasonable ratio of alloying elements and stable mechanical properties, especially good ultra-low temperature toughness and crack resistance it is good. After the weld seam is heat treated at 570℃±10℃×1h, the impact energy at 196℃ is ≥50J.

Description

technical field [0001] The invention belongs to the field of welding, and relates to a welding material, in particular to a deposited metal material for ultra-low temperature 304L austenitic stainless steel welding and a preparation method thereof. Background technique [0002] A large-scale pressure vessel project in China is all stainless steel structure, the design working temperature is -163℃~-196℃, the main material used is 304L, and the weld seam and heat-affected zone after post-weld heat treatment are required to be subjected to low-temperature impact at 77K (-196℃) Work (AKV 2 ) not less than 50J. [0003] At present, the reliable and practical welding methods for austenitic stainless steel pressure vessel products are electrode arc welding and submerged arc welding. The welding consumable models for these two methods and 304L are E308L-XX and S F308L FB-S308L. 308L welding consumables usually contain 5-12FN ferrite. The existence of ferrite can effectively preven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/32B23K103/04
CPCB23K9/18B23K9/32B23K2103/05
Inventor 闵晓峰吴梦先莫芝林潘伍覃候华东郭则明林德钰黄攀宇祝强
Owner WUHAN YIYE STEEL STRUCTURE
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