CN108676975A - The heat treatment method of segregation defects in a kind of removal metal welding seam - Google Patents
The heat treatment method of segregation defects in a kind of removal metal welding seam Download PDFInfo
- Publication number
- CN108676975A CN108676975A CN201810558393.6A CN201810558393A CN108676975A CN 108676975 A CN108676975 A CN 108676975A CN 201810558393 A CN201810558393 A CN 201810558393A CN 108676975 A CN108676975 A CN 108676975A
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- heat treatment
- temperature
- welding
- segregation
- weldment
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Classifications
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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
- C21D1/34—Methods of heating
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
- C21D9/505—Cooling thereof
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides a kind of heat treatment methods of segregation defects in removal metal welding seam, and weld metal is first carried out spectral measurement, determines C element and the content of each alloying element；Ar of the austenite to ferritic transformation is calculated again3Temperature；Then, welding metal is heated to complete austenitizing Ar3More than temperature after 30 DEG C, heat preservation makes weldment complete austenitizing；Then air-cooled.Compared with prior art, using making weldment welded seam area chemical composition homogenize, elimination using defect because of segregation heat treatment process of the present invention occurs, improves the mode of its performance.Mainly weldment weld seam is not under the premise of melting, and by workpiece heat to temperature as high as possible, and long-time heat preservation, various diffusion of alloy elements tend to be uniformly distributed rear slow cooling in to-be-welded pieces.
Description
Technical field
The invention belongs to metal heat treatmet fields, and in particular to a kind of heat treatment side removing segregation defects in metal welding seam
Method.
Background technology
The non-uniform phenomenon of chemical constituents analysis contained in steel is known as being segregated, liquid when weld seam segregation is metal welding
Metal in primary crystallization, metal by liquid be changed into it is solid during formed.Due to the difference of welding procedure, will produce
Different microscopic segregations and regional segregation.
Microscopic segregation is also known as microsegregation, and the principal element for influencing microscopic segregation is the chemical composition of metal.Because golden
The chemical composition of category is different, is also differed from starting to crystallize to the temperature range of crystallization end of a period, temperature range more bigger easier production
Raw microscopic segregation.Generally for mild steel, microscopic segregation is not serious, little to the harm of weld seam；And to high-carbon steel, steel alloy
Welding, the defects of serious microscopic segregation can cause fire check.Regional segregation is the cooling segment (Weld pipe mill) of weld seam, is gathered
Collection has more impurity and low-melting alloy and is formed.The appearance of segregation can cause weld seam to occur in the state of working stress
There is fire check under the higher environment of potential crack, especially temperature, the mechanical property of weld seam is caused to fail, occurs unnecessary
Accident.
It can not possibly be carried out under comparatively ideal working environment and technical parameter always in the place of welding, it is difficult to avoid welding
Connect that cooling velocity is too fast and the error of welding procedure and weld metal segregation occurs.Some welding procedures are in order to avoid due to segregation
There is weld defect, directly increase the welding number of plies, width and the depth of welding bead in the welding process, would rather use and increase cost weldering
The mode of multiple tracks increases Welding Safety index, this has resulted in the raising of welding cost.
Invention content
The purpose of the present invention is to provide a kind of heat treatment method of segregation defects in removal metal welding seam, use is appropriate
Heat treatment process makes weldment welded seam area chemical composition homogenize, and elimination occurs using defect because of segregation, improves its use
The mode of performance, not only avoiding the appearance of segregation can cause weld seam potential crack occur in the state of working stress, especially
It is fire check occur under the higher environment of temperature, causes the mechanical property of weld seam to fail, unnecessary accident occurs, while also subtracting
The loss in welding procedure economic value is lacked.
Specific technical solution of the present invention is as follows：
The heat treatment method of segregation defects, includes the following steps in a kind of removal metal welding seam：
1) weld metal is subjected to spectral measurement, determines C element and the content of each alloying element；
2) according to each element content calculation austenite to the Ar of ferritic transformation3Temperature；
3) welding metal is heated to complete austenitizing Ar3More than temperature after 30 DEG C, heat preservation makes the complete Ovshinsky of weldment
Body；
It is 4) air-cooled after keeping the temperature, you can.
Further, soaking time described in step 3) at least 20 minutes.
Further, step 4) is described air-cooled, and average cooling rate is 120 ± 10 DEG C/h.
Weld metal austenitizing Ar is first carried out in the present invention3Temperature is calculated：
1. the measurement of weld metal constituent content：Sample is made using weld metal and carries out spectral measurement, determines C element and each
The content of class alloying element；
2. according to carbon equivalent empirical equation estimated amount weld metal carbon equivalent：
CE=C+A (C) { Si/24+Mn/16+Cu/15+Ni/20+ (Cr+Mo+V+Nb)/5+5B }
3. selecting Ar of the suitable austenite to ferritic transformation according to the content of the carbon equivalent of calculating and alloying element3Temperature
Spend calculation formula, such as the empirical equation of scientific research below：
Ar3=868-396C-68.1Mn+24.6Si-36.1Ni-24.8Cr-20.7Cu；
Or, Ar3=910-273C-74Mn-56Ni-16Cr-9Mo-5Cu；
Then, heat treatment process is formulated, and determines heating and thermal insulation time, the cooling stage cooling rate of welding workpiece：
1. the heating and thermal insulation stage：Welding workpiece needs, with stove heat, welding workpiece need to be heated to above to welded seam gold
Belong to steel grade complete austenitizing (Ar3) more than temperature 30 DEG C.To make material complete austenitizing, welded seam gold need to be heated to
Belong to steel grade complete austenitizing (Ar3) more than temperature after 30 DEG C, need heat preservation at least 20 minutes, it is ensured that the complete austenite of weldment
Change.
2. cooling stage：Weldment is taken out after heat preservation, is utilized respectively the cooling rates such as air-cooled, Sha Leng, air-cooled, water cooling not
Same cooling way is tested.
The two stages are respectively necessary for testing to determine the technological parameter of heating and thermal insulation time, cooling stage cooling rate,
And the best available combination of both technological parameters is also required to cross matching to determine.After process above theory determines, through excessive
Measure specimen test verification, excellent effect.
But the present invention carries out heat treatment to welding workpiece using heat treatment process appropriate eliminates weld seam segregation, not only
In this way, by this heat treatment mode can further crystal grain thinning, improve steel grade intensity, avoid weldment using process
In since there is a situation where accidents for defect.
Weld metal is first carried out spectral measurement by the present invention, determines C element and the content of each alloying element；Ovshinsky is calculated again
Ar3 temperature of the body to ferritic transformation；Then, it after welding metal being heated to 30 DEG C of complete austenitizing Ar3 temperature or more, protects
Temperature makes weldment complete austenitizing；Then air-cooled.Technique through the invention not only eliminates weldment weld material tissue
In segregation defects (see metallograph), avoid and welded since weld metal is segregated under the state or the condition of high temperature of work stress
There is potential crack in seam, avoids the safety accident that may occur, reduces in welding job to increase safety of welding seam index
And increase the welding number of plies, width and the depth of welding bead in the welding process, this reduces welding costs.By above air-cooled
Heat treatment process so that the segregation defects in weld seam metallographic structure have obtained apparent improvement, and crystal grain is organized to obtain
Refinement, improves the mechanical performance of workpiece, in terms of mechanical strength, the surrender of the welding workpiece after heat treatment process, tension are strong
Degree, which is differed with the workpiece before heat treatment, to be no different.
Compared with prior art, heat treatment process of the present invention is disappeared using making weldment welded seam area chemical composition homogenize
Except occurring using defect because of segregation, the mode of its performance is improved.Mainly weldment weld seam is not before melting
It puts, by workpiece heat to temperature as high as possible, and long-time heat preservation, various diffusion of alloy elements tend to be equal in to-be-welded pieces
Slow cooling after even distribution.
Description of the drawings
Fig. 1 is weld seam metallographic structure before present invention heat treatment；
Fig. 2 is air-cooled weld seam metallographic structure after present invention heat treatment.
Specific implementation mode
Embodiment 1
The heat treatment method of segregation defects, includes the following steps in a kind of removal metal welding seam：
1) weld metal is subjected to spectral measurement, determines C element and the content of each alloying element；It is specifically shown in the following table 1：
Table 1 test the basic chemical composition of Steel material, surplus be iron and inevitable impurity,
| C | Si | Mn | P | S | Als |
| 0.12 | 0.25 | 1.40 | ≤0.015 | ≤0.005 | 0.030 |
The most common hot-rolled structural steel that this experiment uses.
2) according to each element content calculation austenite to the Ar3 temperature of ferritic transformation；
2. according to carbon equivalent empirical equation estimated amount weld metal carbon equivalent：
CE=C+A (C) { Si/24+Mn/16+Cu/15+Ni/20+ (Cr+Mo+V+Nb)/5+5B }
3. selecting Ar3 temperature of the suitable austenite to ferritic transformation according to the content of the carbon equivalent of calculating and alloying element
Spend calculation formula, such as the empirical equation of scientific research below：
Ar3=868-396C-68.1Mn+24.6Si-36.1Ni-24.8Cr-20.7Cu；
Or, Ar3=910-273C-74Mn-56Ni-16Cr-9Mo-5Cu；
Then, heat treatment process is formulated, and determines heating and thermal insulation time, the cooling stage cooling rate of welding workpiece：
1. the heating and thermal insulation stage：Welding workpiece needs, with stove heat, welding workpiece need to be heated to above to welded seam gold
Belong to steel grade complete austenitizing Ar3 temperature or more 30 DEG C (i.e. 760 DEG C), keeps the temperature at least 30min, it is ensured that the complete austenite of weldment
Change.
2. cooling stage：Weldment is taken out after heat preservation, is utilized respectively the cooling rates such as air-cooled, Sha Leng, air-cooled, water cooling not
Same cooling way is tested.
The two stages are respectively necessary for testing to determine the technological parameter of heating and thermal insulation time, cooling stage cooling rate,
And the best available combination of both technological parameters is also required to cross matching to determine.After process above theory determines, through excessive
Measure specimen test verification, excellent effect.
3) welding metal is heated to (760 DEG C) after 30 DEG C of complete austenitizing Ar3 temperature or more, keeps the temperature 30min, heating
It is so that ferrite and cementite in tissue is turned again in order to make temperature reach austenite transformation temperature to complete austenitizing temperature
Become austenite again.Ensure certain soaking time be conducive to make the group in material be woven in reach complete austenitizing temperature after have and fill
The time of foot changes, and being tissue fully can completely be changed into austenite.
4) it after keeping the temperature, is cooled down with the average cooling rate of 120 DEG C/h, you can.
Comparative example
The sample and heat treatment method used with embodiment 1, unlike, weldment is taken out after heat preservation, is utilized respectively
The different cooling way of the cooling rates such as air-cooled, Sha Leng, air-cooled, water cooling is tested.
The weldment weld metal of the heat treatment process of the different types of cooling is made into metallographic specimen.
Metallographic structure after the heat treatment process of the different types of cooling is compared mutually and is compared with former metallographic structure, and observation is inclined
Analysis can determine that air-cooled is Very good cooling mode.
Fig. 1 is weld seam metallographic structure before present invention heat treatment；Fig. 2 is air-cooled weld seam metallographic structure after present invention heat treatment.
By Fig. 1 Fig. 2 as it can be seen that coarse grains in weld seam metallographic structure before air-cooled heat treatment test, and along with the segregation of some sheets
Assemble, weld seam metallographic structure after air-cooled heat treatment test, crystal grain obviously becomes smaller and attenuates, and the segregation aggregation of sheet has also obtained obviously
Improvement.
It is compared before the mechanical property of treated 3 samples of embodiment 1 and processing, as a result as shown in table 2 below.
Table 2
| Number | Yield strength (Mpa) | Tensile strength (Mpa) |
| Original sample before heat treatment | 385 | 520 |
| Sample 1 after air-cooled heat treatment | 380 | 525 |
| Sample 2 after air-cooled heat treatment | 390 | 530 |
| Sample 3 after air-cooled heat treatment | 400 | 550 |
As can be seen from Table 2, the intensity value of weldment weld seam does not receive the influence of heat treatment process, intensity number after heat treatment
Value and the numerical value of original sample before heat treatment process are substantially no different.
The present invention it is a kind of removal metal welding seam in segregation defects heat treatment method, it is microcosmic on can effectively remove welding
The segregation defects generated in part weld seam, while crystal grain thinning tissue, improve its comprehensive mechanical performance.It macroscopically avoids due to weldering
Seam metal is segregated in weld seam under the state or the condition of high temperature of work stress and potential crack occurs, avoids the safe thing that may occur
Therefore reduce welding cost.The segregation defects generated in weldment weld seam are being effectively removed, while crystal grain thinning tissue is same
When, it ensure that the intensity of weldment weld metal is constant, ensure that its normal use.
Claims (3)
1. it is a kind of removal metal welding seam in segregation defects heat treatment method, which is characterized in that the heat treatment method include with
Lower step：
1) weld metal is subjected to spectral measurement, determines C element and the content of each alloying element；
2) according to each element content calculation austenite to the Ar3 temperature of ferritic transformation；
3) after welding metal being heated to 30 DEG C of complete austenitizing Ar3 temperature or more, heat preservation makes the complete austenite of weldment
Change；
It is 4) air-cooled after keeping the temperature, you can.
2. the heat treatment method according to claim 1, which is characterized in that soaking time described in step 3) at least 20
Minute.
3. the heat treatment method according to claim 1 or 2, which is characterized in that step 4) is described air-cooled, average cooling
Speed is 120 ± 10 DEG C/h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810558393.6A CN108676975B (en) | 2018-06-01 | 2018-06-01 | Heat treatment method for removing segregation defects in metal welding seam |
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| CN201810558393.6A CN108676975B (en) | 2018-06-01 | 2018-06-01 | Heat treatment method for removing segregation defects in metal welding seam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6479320A (en) * | 1987-09-19 | 1989-03-24 | Nippon Steel Corp | Improvement of material quality of metal for welding austenitic stainless steel |
| CN101503757A (en) * | 2009-03-11 | 2009-08-12 | 中国科学院金属研究所 | Heat treatment technique for improving niobium-containing low-carbon steel weld metal structure and comprehensive property |
| CN102912108A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Heat treatment process for improving microstructure and properties of micro-alloy steel weld joint |
| CN103459635A (en) * | 2011-03-29 | 2013-12-18 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet exhibiting excellent resistance to stress corrosion cracking, and method for producing same |
| CN105899702A (en) * | 2014-03-17 | 2016-08-24 | 杰富意钢铁株式会社 | Steel material for welding |
| CN106755868A (en) * | 2016-12-13 | 2017-05-31 | 钢铁研究总院 | A kind of low cost can Large Heat Input Welding high-strength and high ductility steel plate manufacture method |
-
2018
- 2018-06-01 CN CN201810558393.6A patent/CN108676975B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6479320A (en) * | 1987-09-19 | 1989-03-24 | Nippon Steel Corp | Improvement of material quality of metal for welding austenitic stainless steel |
| CN101503757A (en) * | 2009-03-11 | 2009-08-12 | 中国科学院金属研究所 | Heat treatment technique for improving niobium-containing low-carbon steel weld metal structure and comprehensive property |
| CN103459635A (en) * | 2011-03-29 | 2013-12-18 | 杰富意钢铁株式会社 | Abrasion-resistant steel sheet exhibiting excellent resistance to stress corrosion cracking, and method for producing same |
| CN102912108A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Heat treatment process for improving microstructure and properties of micro-alloy steel weld joint |
| CN105899702A (en) * | 2014-03-17 | 2016-08-24 | 杰富意钢铁株式会社 | Steel material for welding |
| CN106755868A (en) * | 2016-12-13 | 2017-05-31 | 钢铁研究总院 | A kind of low cost can Large Heat Input Welding high-strength and high ductility steel plate manufacture method |
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Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 Intellectual Property Department, Technical Center No. 8, Hunan West Road, Yushan District, Ma'anshan City, Anhui Province Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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