CN111996345A - Oxidation-free dehydrogenation treatment process for austenitic stainless steel welding material - Google Patents
Oxidation-free dehydrogenation treatment process for austenitic stainless steel welding material Download PDFInfo
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- CN111996345A CN111996345A CN202010748486.2A CN202010748486A CN111996345A CN 111996345 A CN111996345 A CN 111996345A CN 202010748486 A CN202010748486 A CN 202010748486A CN 111996345 A CN111996345 A CN 111996345A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/06—Extraction of hydrogen
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- Arc Welding In General (AREA)
Abstract
The invention discloses an oxidation-free dehydrogenation treatment process for an austenitic stainless steel welding material, and belongs to the technical field of metal material heat treatment. Putting the austenitic stainless steel welding material into a vacuum atmosphere furnace, vacuumizing, filling 99.99% of pure Ar, heating to 300-700 ℃ along with the furnace, preserving heat for 3-100 hours, slowly cooling to below 50 ℃ along with the furnace, and discharging to finish dehydrogenation treatment. After the austenitic stainless steel welding material is subjected to dehydrogenation treatment according to the process disclosed by the invention, the H content is less than or equal to 2ppm, the O content is basically kept unchanged, the surface of the welding material is bright and has no obvious oxidation phenomenon, the appearance shape and the size of the welding material are not obviously changed, and the welding manufacturability of the welding material is not changed.
Description
Technical Field
The invention belongs to the technical field of heat treatment of metal materials, and particularly relates to a non-oxidation dehydrogenation treatment process for an austenitic stainless steel welding material.
Background
Hydrogen embrittlement is that hydrogen dissolved in steel cannot be released in time in the process of metal solidification and diffuses to the vicinity of defects in the metal, atomic hydrogen polymerizes into hydrogen molecules at the defects when the temperature reaches room temperature, so that huge internal pressure is generated, stress concentration is caused, when the strength of the steel exceeds the strength limit, fine cracks are formed in the steel, and the toughness and the plasticity of the material are obviously reduced.
Hydrogen embrittlement is only preventive and not controllable, and once hydrogen embrittlement occurs, it cannot be eliminated. The trace hydrogen entering the material during the smelting process of the material and the manufacturing and assembling process of the parts can cause the material to be embrittled and even cracked under the action of internal residual or external stress. In particular, a welded component can generate larger residual stress in the welding process, so the hydrogen embrittlement problem is more obvious, the hydrogen content in a welding seam is strictly controlled, the hydrogen in the welding seam is introduced from the welding environment, the H content of a welding material also has obvious influence on the final hydrogen content of the welding seam, the H content in a welding material is strictly controlled, H is brought in the austenitic stainless steel welding material preparation process, such as an alloy smelting process, an electroslag remelting process, a hydrogen charging annealing process during welding material drawing and the like. For austenitic stainless steel welding materials applied to important parts, once the hydrogen content exceeds the standard, the batch of welding materials are scrapped, so that not only can serious economic loss be caused, but also project delay can be caused, and therefore a method for solving the problem that the austenitic stainless steel welding materials H exceed the standard is urgently needed.
Disclosure of Invention
The invention aims to provide a non-oxidation dehydrogenation treatment process for an austenitic stainless steel welding material, aiming at the austenitic stainless steel welding material with the H content of more than 2ppm, the process can ensure that the H content in the austenitic stainless steel welding material is less than or equal to 2ppm, the O content is basically kept unchanged, the appearance shape and the size of the welding material are not obviously changed, and the welding manufacturability is not changed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a non-oxidation dehydrogenation treatment process for an austenitic stainless steel welding material is characterized in that the austenitic stainless steel welding material to be treated with the H content of more than 2ppm is placed in a vacuum atmosphere furnace, and is vacuumized and filled with argon; and then heating the furnace to 300-700 ℃, preserving heat for 3-100 hours, cooling along with the furnace, and discharging to finish dehydrogenation treatment.
In the process, the purity of the filled argon is more than 99.99 percent.
In the process, the heating rate of the furnace temperature is not less than 1 ℃/min, and the preferred range is 1-10 ℃/min.
In the process, the welding material is slowly cooled to below 50 ℃ along with the furnace during cooling, and the welding material is discharged from the furnace; the cooling speed is ensured to be not higher than 2 ℃/min, and the preferable range is 0.1-2 ℃/min, so that the hydrogen can be fully removed.
In the process, the content of H in the austenitic stainless steel welding material to be treated is more than 2 ppm.
After the process is adopted for treatment, the H content in the austenitic stainless steel welding material is less than or equal to 2ppm, and the O content is basically kept unchanged.
The principle of the invention is as follows:
the invention carries out heat treatment on the austenitic stainless steel welding material with high hydrogen content under the protective atmosphere, and the heating temperature, the heat preservation time and the cooling speed of the heat treatment process are adjusted to ensure that the H content in the austenitic stainless steel welding material is lower than 2ppm, the O content basically keeps unchanged, the appearance shape and the size of the austenitic stainless steel welding material are not obviously changed, the surface of the welding material is bright, the obvious oxidation phenomenon does not exist, the welding manufacturability of the welding material is not changed, and the hydrogen embrittlement sensitivity of subsequent welding seams can be reduced.
The invention has the following advantages:
1. the invention starts from controlling the dehydrogenation heat treatment process of the austenitic stainless steel welding material, and ensures that the H content in the austenitic stainless steel welding material is lower than 2ppm, the O content is basically kept unchanged, the appearance shape and the size of the austenitic stainless steel welding material are not obviously changed, and the welding manufacturability of the austenitic stainless steel welding material is not changed by selecting proper heating temperature, heat preservation time and cooling speed.
2. All the heat treatment process parameters adopted by the invention can realize industrial application.
3. According to the invention, the hydrogen embrittlement sensitivity of subsequent welding seams can be reduced by reducing the H content in the austenitic stainless steel welding material.
4. The method can reduce the H content in the austenitic stainless steel welding material, avoid the welding material from being scrapped due to the excessive hydrogen content of the welding material, and avoid the economic loss and engineering delay caused by the scrapping of the welding material.
Description of the drawings:
FIG. 1 is a schematic view of the non-oxidation dehydrogenation process of the austenitic stainless steel welding material.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
The invention relates to a non-oxidation dehydrogenation process of an austenitic stainless steel welding material, and the process flow is shown in figure 1. Putting the austenitic stainless steel welding material into a vacuum atmosphere furnace, vacuumizing, filling 99.99% of pure Ar, heating to 300-700 ℃ along with the furnace, keeping the temperature for a period of time, slowly cooling along with the furnace to ensure that hydrogen in the welding material is diffused outwards, cooling to below a certain temperature, and discharging to finish dehydrogenation treatment. Wherein: the heating rate is not less than 1 ℃/min when the furnace is heated, the heat preservation time is 3-100 hours, the furnace is slowly cooled to below 50 ℃ when the furnace is cooled, and the cooling speed is ensured to be not higher than 2 ℃/min, so that the hydrogen is fully removed.
The heat treatment equipment used by the invention has no special requirements, and the heat treatment equipment can be used in a common vacuum atmosphere furnace. The welding materials used in the examples and the comparative examples of the invention are 316H austenitic stainless steel welding materials with different specifications, including austenitic stainless steel welding materials with the diameters of phi 1.2mm, phi 2.0mm, phi 2.4mm, phi 3.2mm, phi 4.0mm and phi 5.0mm ER 316H.
In the following examples and comparative examples, a vacuum furnace was evacuated and charged with 99.99% pure Ar before heating; the cooling rate was 0.5 ℃/min.
Example 1:
the heat treatment process comprises the following steps: heating the austenitic stainless steel welding material ER316H with the diameter of 1.2mm to 350 ℃ at the speed of 4 ℃/min, preserving the temperature for 20 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 2:
the heat treatment process comprises the following steps: heating the phi 2.0mm ER316H austenitic stainless steel welding material to 400 ℃ at the speed of 4 ℃/min, preserving the temperature for 15 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 3:
the heat treatment process comprises the following steps: heating the austenitic stainless steel welding material with the diameter of 2.4mm ER316H to 450 ℃ at the speed of 4 ℃/min, preserving the temperature for 10 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 4:
the heat treatment process comprises the following steps: heating the phi 3.2mm ER316H austenitic stainless steel welding material to 500 ℃ at the speed of 4 ℃/min, preserving the heat for 8 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 5:
the heat treatment process comprises the following steps: heating the austenitic stainless steel welding material ER316H with the diameter of 4.0mm to 550 ℃ at the speed of 4 ℃/min, preserving the temperature for 10 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 6:
the heat treatment process comprises the following steps: heating the austenitic stainless steel welding material ER316H with the diameter of 5.0mm to 600 ℃ at the speed of 4 ℃/min, preserving the temperature for 6 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Example 7:
the heat treatment process comprises the following steps: heating the austenitic stainless steel welding material ER316H with the diameter of 5.0mm to 350 ℃ at the speed of 4 ℃/min, preserving the temperature for 50 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Comparative example 1:
the heat treatment process comprises the following steps: rapidly heating the ER316H austenitic stainless steel welding material with the diameter of 5.0mm to 200 ℃ at the speed of 4 ℃/min, preserving the temperature for 10 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Comparative example 2:
the heat treatment process comprises the following steps: rapidly heating the phi 4.0mm ER316H austenitic stainless steel welding material to 350 ℃ at the speed of 4 ℃/min, preserving the temperature for 1 hour, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Comparative example 3:
the heat treatment process comprises the following steps: rapidly heating the ER316H austenitic stainless steel welding material with the diameter of 1.2mm to 850 ℃ at the speed of 4 ℃/min, preserving the temperature for 30 hours, and then slowly cooling along with the furnace. The content of the welding material H, O before and after heat treatment and the appearance of the welding material after heat treatment are shown in Table 1.
Table 1 test results of examples and comparative examples:
as can be seen from examples 1 to 7, comparative examples 1 to 3 and Table 1:
by adopting the non-oxidation dehydrogenation process for the austenitic stainless steel welding material designed by the invention, in the examples 1-7, the H content in the austenitic stainless steel welding material with the diameters of phi 1.2mm, phi 2.0mm, phi 2.4mm, phi 3.2mm, phi 4.0mm and phi 5.0mm ER316H is obviously reduced, the hydrogen can be effectively removed, the O content is basically kept unchanged, and the welding material is not deformed after heat treatment. The heat treatment temperature of comparative example 1 is lower than the range of the technical scheme of the invention, so that H cannot be completely removed, and the H content is still high; the heat treatment heat preservation time of the comparative example 2 is lower than the range of the technical scheme of the invention, so that H cannot be completely removed, and the H content is still high; the heat treatment temperature of comparative example 3 is higher than the range of the technical scheme of the invention, and H can be effectively removed, but the welding material is obviously deformed due to the higher heat treatment temperature.
Claims (6)
1. A non-oxidation dehydrogenation treatment process for austenitic stainless steel welding materials is characterized in that; putting an austenitic stainless steel welding material to be treated into a vacuum atmosphere furnace, vacuumizing and filling argon; and then heating the furnace to 300-700 ℃, preserving heat for 3-100 hours, cooling along with the furnace, and discharging to finish dehydrogenation treatment.
2. The austenitic stainless steel welding material non-oxidation dehydrogenation treatment process according to claim 1, characterized in that: the purity of the filled argon is more than 99.99 percent.
3. The austenitic stainless steel welding material non-oxidation dehydrogenation treatment process according to claim 1, characterized in that: the heating rate of the furnace temperature is not less than 1 ℃/min.
4. The austenitic stainless steel welding material non-oxidation dehydrogenation treatment process according to claim 1, characterized in that: and slowly cooling to below 50 ℃ along with the furnace during cooling, and discharging the welding material out of the furnace.
5. The austenitic stainless steel welding material non-oxidation dehydrogenation treatment process according to claim 1, characterized in that: the content of H in the austenitic stainless steel welding material to be treated is more than 2 ppm.
6. The austenitic stainless steel welding material non-oxidation dehydrogenation treatment process according to claim 1, characterized in that: the content of H in the austenitic stainless steel welding material after being discharged from the furnace is less than or equal to 2ppm, and the content of O is basically kept unchanged.
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| CN202010748486.2A CN111996345A (en) | 2020-07-30 | 2020-07-30 | Oxidation-free dehydrogenation treatment process for austenitic stainless steel welding material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457215A (en) * | 2021-04-02 | 2022-05-10 | 中国科学院金属研究所 | Hydrogen reduction treatment method for austenitic steel seamless pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101443469A (en) * | 2007-01-31 | 2009-05-27 | 独立行政法人产业技术综合研究所 | Austenitic stainless steel and process for removing hydrogentherefrom |
| CN102618894A (en) * | 2012-04-01 | 2012-08-01 | 昆明理工大学 | Method for preparing thin-wall parts by using electroforming nickel-cobalt alloy |
| CN105518161A (en) * | 2013-07-05 | 2016-04-20 | 奥托库姆普联合股份公司 | Stainless steel resistant to delayed cracking and a method for its production |
| CN106244780A (en) * | 2016-08-29 | 2016-12-21 | 沈阳科金特种材料有限公司 | A kind of control method of nuclear power forging material hydrogen content |
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2020
- 2020-07-30 CN CN202010748486.2A patent/CN111996345A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101443469A (en) * | 2007-01-31 | 2009-05-27 | 独立行政法人产业技术综合研究所 | Austenitic stainless steel and process for removing hydrogentherefrom |
| CN102618894A (en) * | 2012-04-01 | 2012-08-01 | 昆明理工大学 | Method for preparing thin-wall parts by using electroforming nickel-cobalt alloy |
| CN105518161A (en) * | 2013-07-05 | 2016-04-20 | 奥托库姆普联合股份公司 | Stainless steel resistant to delayed cracking and a method for its production |
| CN106244780A (en) * | 2016-08-29 | 2016-12-21 | 沈阳科金特种材料有限公司 | A kind of control method of nuclear power forging material hydrogen content |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114457215A (en) * | 2021-04-02 | 2022-05-10 | 中国科学院金属研究所 | Hydrogen reduction treatment method for austenitic steel seamless pipe |
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