CN107245565A - The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler - Google Patents
The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler Download PDFInfo
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- CN107245565A CN107245565A CN201710442746.1A CN201710442746A CN107245565A CN 107245565 A CN107245565 A CN 107245565A CN 201710442746 A CN201710442746 A CN 201710442746A CN 107245565 A CN107245565 A CN 107245565A
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- Prior art keywords
- continuous casting
- round bloom
- pressure boiler
- bloom
- casting round
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 59
- 238000000137 annealing Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005266 casting Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 230000035882 stress Effects 0.000 claims description 25
- 230000008646 thermal stress Effects 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
Classifications
-
- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
-
- 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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention belongs to technical field of heat treatment, a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler is related generally to, this method includes：The effective steel continuous casting round bloom of high-pressure boiler is through being casting continuously to form base, casting blank surface temperature is not less than 500 DEG C and enters annealing furnace after continuous casting billet ejection, samming, heating, insulation, cooling are carried out in annealing furnace afterwards to continuous casting round bloom progress destressing operation, final continuous casting round bloom is cooled to less than 150 DEG C and come out of the stove.It is an object of the invention to overcome present in prior art, the effective steel continuous casting round bloom of high-pressure boiler provides a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler because of Surface Crack Problems formed by stress relief annealing is insufficient under the existing mode of production.
Description
Technical field
The invention belongs to technical field of heat treatment, a kind of destressing of the effective steel continuous casting round bloom of high-pressure boiler is related generally to
Method for annealing.
Background technology
P91 steel is a kind of martensite heat-resistant steel, is mainly used in Large Copacity thermal power generation unit high-pressure boiler tube, due to P91
Steel alloy element species are more, content is higher, poor thermal conductivity, easily form thermal stress, and the steel has preferable quenching degree, mainly
Martensite is organized as, structural stress is larger, causes continuous casting round bloom crack problem easily occur.Accordingly, it would be desirable to develop a kind of reliable
Continuous casting round bloom stress relief annealing method.
The content of the invention
It is an object of the invention to overcome present in above-mentioned prior art the effective P91 of high-pressure boiler under the existing mode of production
Steel continuous casting round bloom provides a kind of effective steel of high-pressure boiler because of Surface Crack Problems formed by stress relief annealing is insufficient and connected
Cast the stress relief annealing method of large round billet.
The technical scheme is that：A kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler, the party
Method includes：The effective steel continuous casting round bloom of high-pressure boiler is through being casting continuously to form base, and casting blank surface temperature is not less than 500 DEG C after continuous casting billet ejection
Enter annealing furnace, progress samming, heating, insulation, cooling carry out destressing operation to continuous casting round bloom in annealing furnace afterwards, finally
Continuous casting round bloom is cooled to less than 150 DEG C and come out of the stove.
The effective steel of high-pressure boiler is P91 steel, and chemical composition is by mass percentage：C=0.08~0.12%, Si=0.20 ~
0.50%, Mn=0.30 ~ 0.60%, P≤0.025%, S≤0.015%, Ni≤0.40%, Cr=8.00% ~ 9.50%, Mo=0.85 ~
1.05%, V=0.18 ~ 0.25%, Nb=0.06 ~ 0.10%, Cu≤0.20%, N=0.03 ~ 0.07%, Al≤0.020%, surplus be Fe and
Other inevitable impurity elements.
It is not required to bend in continuous casting round bloom continuous casting forming on vertical casting machine, casting process, aligns, no straightening stress.
After continuous casting round bloom ejection casting blank surface temperature control be heat-fed at 500~750 DEG C, after ejection in 5~15 minutes into
Annealing furnace.
Continuous casting round bloom diameter is between 400~800mm of φ.
It is 550~650 DEG C that continuous casting round bloom, which enters the samming temperature after stove, and equal temperature time is effective per 100mm continuous cast round billets
0.5~0.8h of cross-sectional diameter.
Programming rate≤100 DEG C/h after continuous casting round bloom samming, is warming up to 820 ± 10 DEG C and is incubated, soaking time is
Per 100mm continuous cast round billets effective cross section 1.5~2h of diameter.
Start cooling after continuous casting round bloom insulation, cooling rate≤25 DEG C/h, continuous casting round bloom is cooled to less than 150 DEG C and gone out
Stove, to eliminate continuous casting round bloom structural stress and thermal stress.
The good effect that technical scheme is produced is as follows：Continuous casting round bloom continuous casting forming on vertical casting machine,
High degree of symmetry, cooling are uniform when continuous casting billet solidifies, without interior outer arc side temperature difference, compared to the continuous casting forming mode of other forms,
It is not required to bend in casting process, aligns, strand controls the time from continuous casting to ejection, it is ensured that when entering annealing furnace without straightening stress
More than 500 DEG C of strand temperature, by the equal method such as insulation under high temperature, can eliminate round billet tissue to control the less thermal stress of strand
Stress and thermal stress.
The stress relief annealing method of the present invention can effectively solve the problem that after the annealing of high-pressure boiler effective P91 steel continuous casting round bloom because
Round billet Surface Crack Problems caused by stress reason, and this method is simple and easy to apply, and with short production cycle, cost is low, destressing
Effect is good, and energy conservation and consumption reduction effects are notable.
Embodiment
Technical scheme is further elaborated with reference to three embodiments.
Embodiment one
The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler, φ 400mm P91 continuous cast round billets, this method include with
Lower step：Surface temperature is 650 DEG C after the continuous casting on vertical casting machine, ejection, is heat-fed within 5 minutes into annealing furnace, samming temperature is
650 DEG C, equal temperature time 3h, programming rate is 60 DEG C/h after samming, is warming up to 820 DEG C and is incubated, soaking time is 6h, insulation
After start cooling, cooling rate be 15 DEG C/h, be cooled to less than 150 DEG C and come out of the stove.
Inspection surface is handed over after coming out of the stove, continuous cast round billets surface flawless, detection case hardness is 228HB.
Embodiment two
The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler, Φ 600mm P91 continuous cast round billets, this method include with
Lower step：Surface temperature is 600 DEG C after the continuous casting on vertical casting machine, ejection, is heat-fed within 8 minutes into annealing furnace, samming temperature is
600 DEG C, equal temperature time 4h, programming rate is 60 DEG C/h after samming, is warming up to 820 DEG C and is incubated, soaking time is 9h, insulation
After start cooling, cooling rate be 15 DEG C/h, be cooled to less than 150 DEG C and come out of the stove.
Inspection surface is handed over after coming out of the stove, continuous cast round billets surface flawless, detection case hardness is 235HB.
Embodiment three
The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler, Φ 800mm P91 continuous cast round billets, this method include with
Lower step：P91 continuous cast round billets, the continuous casting on vertical casting machine, surface temperature is 580 DEG C after ejection, is heat-fed into annealing within 10 minutes
Stove, samming temperature is 550 DEG C, equal temperature time 5h, and programming rate is 60 DEG C/h after samming, is warming up to 820 DEG C and is incubated, and is incubated
Time is to start cooling after 12h, insulation, and cooling rate is 15 DEG C/h, is cooled to less than 150 DEG C and comes out of the stove.
Inspection surface is handed over after coming out of the stove, continuous cast round billets surface flawless, detection case hardness is 242HB.
Claims (8)
1. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler, it is characterised in that：This method includes following
Step：The effective steel continuous casting round bloom of high-pressure boiler is through being casting continuously to form base, and casting blank surface temperature is not less than 500 DEG C and entered after continuous casting billet ejection
Annealing furnace, carries out samming, heating, insulation, cooling to continuous casting round bloom progress destressing operation in annealing furnace, finally connects afterwards
Casting large round billet is cooled to less than 150 DEG C and come out of the stove.
2. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：The effective steel of high-pressure boiler is P91 steel, and chemical composition is by mass percentage：C=0.08~0.12%, Si=0.20 ~
0.50%, Mn=0.30 ~ 0.60%, P≤0.025%, S≤0.015%, Ni≤0.40%, Cr=8.00% ~ 9.50%, Mo=0.85 ~
1.05%, V=0.18 ~ 0.25%, Nb=0.06 ~ 0.10%, Cu≤0.20%, N=0.03 ~ 0.07%, Al≤0.020%, surplus be Fe and
Other inevitable impurity elements.
3. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：It is not required to bend in continuous casting round bloom continuous casting forming on vertical casting machine, casting process, aligns, no straightening stress.
4. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：Casting blank surface temperature control is heat-fed into annealing at 500~750 DEG C after ejection in 5~15 minutes after continuous casting round bloom ejection
Stove.
5. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：Continuous casting round bloom diameter is between 400~800mm of φ.
6. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：It is 550~650 DEG C that continuous casting round bloom, which enters the samming temperature after stove, and equal temperature time is effectively transversal per 100mm continuous cast round billets
Face 0.5~0.8h of diameter.
7. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：Programming rate≤100 DEG C/h after continuous casting round bloom samming, is warming up to 820 ± 10 DEG C and is incubated, soaking time is every
100mm continuous cast round billets effective cross section 1.5~2h of diameter.
8. a kind of stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler according to claim 1, its feature
It is：Start cooling after continuous casting round bloom insulation, cooling rate≤25 DEG C/h, continuous casting round bloom is cooled to less than 150 DEG C and come out of the stove,
To eliminate continuous casting round bloom structural stress and thermal stress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442746.1A CN107245565A (en) | 2017-06-13 | 2017-06-13 | The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710442746.1A CN107245565A (en) | 2017-06-13 | 2017-06-13 | The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler |
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| CN107245565A true CN107245565A (en) | 2017-10-13 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710442746.1A Pending CN107245565A (en) | 2017-06-13 | 2017-06-13 | The stress relief annealing method of the effective steel continuous casting round bloom of high-pressure boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660359A (en) * | 2018-05-02 | 2018-10-16 | 河南中原特钢装备制造有限公司 | The continuous cast round billets production method of inexpensive ultra supercritical high-pressure boiler tube |
| CN113699337A (en) * | 2021-08-06 | 2021-11-26 | 山西太钢不锈钢股份有限公司 | Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel |
| CN115216686A (en) * | 2022-06-10 | 2022-10-21 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of P92 steel continuous casting round billet for extra-large-specification high-temperature service environment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030097A (en) * | 1987-04-01 | 1989-01-04 | 冶金工业部钢铁研究总院 | New Deformation Annealing Process for Martensitic Steel |
| CN1118010A (en) * | 1995-07-21 | 1996-03-06 | 宝山钢铁(集团)公司 | High-temp. high-alloy billet annealing method |
| CN102581555A (en) * | 2012-02-21 | 2012-07-18 | 衡阳华菱钢管有限公司 | P91 seamless steel pipe and method for manufacturing same |
-
2017
- 2017-06-13 CN CN201710442746.1A patent/CN107245565A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1030097A (en) * | 1987-04-01 | 1989-01-04 | 冶金工业部钢铁研究总院 | New Deformation Annealing Process for Martensitic Steel |
| CN1118010A (en) * | 1995-07-21 | 1996-03-06 | 宝山钢铁(集团)公司 | High-temp. high-alloy billet annealing method |
| CN102581555A (en) * | 2012-02-21 | 2012-07-18 | 衡阳华菱钢管有限公司 | P91 seamless steel pipe and method for manufacturing same |
Non-Patent Citations (3)
| Title |
|---|
| 蔡新泽等: "《金工实习教材 第2版》", 31 January 2009 * |
| 赵洪运等: "《材料成形原理》", 30 September 2009 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660359A (en) * | 2018-05-02 | 2018-10-16 | 河南中原特钢装备制造有限公司 | The continuous cast round billets production method of inexpensive ultra supercritical high-pressure boiler tube |
| CN113699337A (en) * | 2021-08-06 | 2021-11-26 | 山西太钢不锈钢股份有限公司 | Heat treatment process for continuous casting large round billet of 9Cr heat-resistant steel |
| CN115216686A (en) * | 2022-06-10 | 2022-10-21 | 江阴兴澄特种钢铁有限公司 | Manufacturing method of P92 steel continuous casting round billet for extra-large-specification high-temperature service environment |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180803 Address after: 459000 531 Industrial Park of tiger ridge industrial cluster, Jiyuan, Henan Applicant after: Henan Zhongyuan special steel equipment manufacturing Co., Ltd. Address before: 454450 Xiao Zhai, Jiyuan Town, Jiyuan City, Henan Applicant before: Zhongyuan Special Steel Co., Ltd. |
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