Non-oxidation dehydrogenation treatment technology for austenite stainless steel welding material

An austenitic stainless steel, hydrogen treatment technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as economic losses, engineering delays, exceeding standards, etc., to reduce H content, avoid economic losses, and reduce hydrogen embrittlement effect of sensitivity

Pending Publication Date: 2020-11-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For austenitic stainless steel welding consumables used in important parts, once the hydrogen content exceeds the standard, the batch of welding consumables will be scrapped, which will not only cause serious economic losses, but also cause project delays. Therefore, it is urgent to propose a solution to austenitic stainless steel welding consumables The method of H exceeding the standard

Method used

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  • Non-oxidation dehydrogenation treatment technology for austenite stainless steel welding material
  • Non-oxidation dehydrogenation treatment technology for austenite stainless steel welding material
  • Non-oxidation dehydrogenation treatment technology for austenite stainless steel welding material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Heat treatment process: Heat the Φ1.2mm ER316H austenitic stainless steel welding consumable at 4°C / min to 350°C for 20 hours and then cool slowly with the furnace. See Table 1 for the H and O contents of the welding consumables before and after heat treatment and the appearance of the welding consumables after heat treatment.

Embodiment 2

[0027] Heat treatment process: Heat Φ2.0mm ER316H austenitic stainless steel welding consumables at 4°C / min to 400°C for 15 hours and then cool slowly with the furnace. See Table 1 for the H and O contents of the welding consumables before and after heat treatment and the appearance of the welding consumables after heat treatment.

Embodiment 3

[0029] Heat treatment process: Heat the Φ2.4mm ER316H austenitic stainless steel welding consumable at 4°C / min to 450°C for 10 hours and then cool slowly with the furnace. See Table 1 for the H and O contents of the welding consumables before and after heat treatment and the appearance of the welding consumables after heat treatment.

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Abstract

The invention discloses a non-oxidation dehydrogenation treatment technology for an austenite stainless steel welding material, and belongs to the technical field of heat treatment of metallic materials. The non-oxidation dehydrogenation treatment technology comprises the steps of putting the austenite stainless steel welding material into a vacuum atmosphere furnace, performing vacuumizing, charging 99.99% pure Ar, performing heating to 300-700 DEG C along with the furnace, performing heat insulation for 3-100 hours, performing slow cooling to 50 DEG C or below along with the furnace, performing discharging from the furnace, and performing dehydrogenation treatment. After the austenite stainless steel welding material is subjected to the dehydrogenation treatment according to the technology disclosed by the invention, the H content is smaller than or equal to 2ppm, the O content is basically kept unchanged, the welding material is bright in surfaces and does not have obvious oxidization phenomena, the appearance shape and the dimension of the welding material are not obviously changed, and the welding technology performance is not changed.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, in particular to a non-oxidative dehydrogenation treatment process for austenitic stainless steel welding materials. Background technique [0002] Hydrogen embrittlement is the process of metal solidification, the hydrogen dissolved in the steel is not released in time, and diffuses to the vicinity of the defect in the metal. At room temperature, atomic hydrogen aggregates into hydrogen molecules at the defect, thereby generating huge internal pressure. Stress concentration is caused, and when the strength limit of steel is exceeded, fine cracks are formed inside the steel, which significantly reduces the toughness and plasticity of the material. [0003] Hydrogen embrittlement can only be prevented, not cured. Once hydrogen embrittlement occurs, it cannot be eliminated. The trace amount of hydrogen entering the material during the smelting process of the material and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/06C21D11/00C21D9/52C21D1/74
CPCC21D1/74C21D3/06C21D9/525C21D11/00
Inventor 陆善平魏世同吴栋李依依
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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