CN104726779A - High-Cr ferritic heat-resisting steel and production method thereof - Google Patents
High-Cr ferritic heat-resisting steel and production method thereof Download PDFInfo
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- CN104726779A CN104726779A CN201510190201.7A CN201510190201A CN104726779A CN 104726779 A CN104726779 A CN 104726779A CN 201510190201 A CN201510190201 A CN 201510190201A CN 104726779 A CN104726779 A CN 104726779A
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Abstract
The invention relates to high-Cr ferritic heat-resisting steel and a production method thereof. The technical scheme includes that the high-Cr ferritic heat-resisting steel comprises, by weight, 8.5-9.5% of Cr, 2.5-3.5% of Co, 2.8-3.3% of W+Mo, 0.15-0.25% of V, 0.05-0.1% of Nb, 0.001-0.01% of C, 0.01-0.05% of N, 0.003-0.01% of B and the balance iron and inevitable impurities, wherein 2.8-3.3% of W+Mo includes 1.5-2.5% of W and 0.5-1.5% of Mo. The production method includes dosing according to chemical components of the high-Cr ferritic heat-resisting steel and content of the chemical components, smelting in a vacuum induction furnace, pouring to form steel ingots and subjecting the steel ingots to hot rolling to form a plate; normalizing for 0.8-1.2 hours at the temperature of 1050-1100 DEG C, then tempering for 0.8-1.2 hours at the temperature of 760-800 DEG C and naturally cooling in the furnace so as to obtain the high-Cr ferritic heat-resisting steel. The produced high-Cr ferritic heat-resisting steel is significantly higher than existing 9-12Cr ferritic heat-resisting steel in creep rupture strength and is applicable to structures and parts and components with the working temperature of 650 DEG C.
Description
Technical field
The invention belongs to jessop technical field.Be specifically related to a kind of high Cr jessop and preparation method thereof.
Background technology
Save the energy, improve coal-fired rate of utilization and reduce the Main way that the quantity discharged of carbonic acid gas is the development of contemporary heat power plant, by Development of Ultra-Supercritical (USC) fired power generating unit and the steam parameter (vapor temperature and pressure) improving steam turbine overcomes the above problems the most effective approach.In nearly ten years, steam parameter brings up to 600 DEG C/30MPa from 530 DEG C/18MPa, and generating efficiency brings up to 42% ~ 47% from 30% ~ 35%, simultaneously CO
2quantity discharged decreases 30%, brings considerable economy and environmental benefit to the whole world.But the high-temperature behavior of raising to high temperature steel of steam parameter is had higher requirement, except requiring that high temperature steel has except enough good oxidation-resistance property, the more important thing is and require that it has higher high temperature and creep resistance intensity or creep rupture strength.
Nowadays, what the high-temperature component of ultra supercritical coal-fired unit adopted is the high chromium content ferrite series heat-resistant steel of a series of 9 ~ 12Cr type (massfraction of chromium is 9% ~ 12%).This kind of jessop is after normalizing+tempering heat treatment, and supply of material state is organized as the lath martensite and M with high density dislocation
23c
6(Cr
23c
6) and MX [(V, Nb) (C, N)] precipitated phase.Due to M
23c
6with the precipitation strength of MX, the strengthening of solid solution atom and high density dislocation strengthening, this Series Steel is made just to have good intensity from military service.But during long service, M
23c
6with the constantly alligatoring of Laves phase, while reducing solution strengthening effect, also Creep hole can be formed; Z phase the creep later stage precipitation with grow up and greatly weaken the dispersion-strengthened action of MX phase, and increase the probability that Creep hole occurs further, the relative creep property of Z reduces role and is far longer than M
23c
6the alligatoring of phase and Laves phase.Therefore, high Cr jessop at high temperature long-play time, creep strength can significantly reduce, and is easy to that creep rupture occurs and causes losing efficacy, thus affect the security of equipment operation.The use temperature of existing 9 ~ 12Cr type jessop can not higher than 620 DEG C.Make jessop for the environment of temperature higher than 620 DEG C, then it must reach 100MPa higher than 100000 hours creep rupture strengths under 620 DEG C of conditions.And the 100000 hour creep rupture strengths of existing 9 ~ 12Cr type jessop in the environment of temperature higher than 620 DEG C can not meet this requirement.
Summary of the invention
The present invention is intended to overcome prior art defect, object is to provide a kind of high Cr jessop and preparation method thereof, prepared high Cr jessop can be used for structural steel and the component steel that working temperature is 650 DEG C, especially for manufacture working temperature be 650 DEG C ultra supercritical steam turbine, oil engine, high temperature chemical industry equipment and nuclear-plant.
For realizing above object, the technical solution used in the present invention is: chemical composition and the content thereof of described high Cr jessop are: Cr is 8.5 ~ 9.5wt%; Co is 2.5 ~ 3.5wt%; W+Mo is 2.8 ~ 3.3wt%, and wherein W is 1.5 ~ 2.5wt%, Mo is 0.5 ~ 1.5wt%; V is 0.15 ~ 0.25wt%; Nb is 0.05 ~ 0.1wt%; C is 0.001 ~ 0.01wt%; N is 0.01 ~ 0.05wt%; B is 0.003 ~ 0.01wt%; Surplus is iron and inevitable impurity.
Prepare burden by the chemical composition of described high Cr jessop and content thereof, melting in vacuum induction furnace, is cast into steel ingot, is rolled into sheet material; Normalizing 0.8 ~ 1.2 hour under 1050 ~ 1100 DEG C of conditions again, then tempering 0.8 ~ 1.2 hour under 760 ~ 800 DEG C of conditions, furnace cooling, obtained high Cr jessop.
Owing to adopting technique scheme, the present invention compared with prior art, has the following advantages:
High Cr jessop carbon content prepared by the present invention is low, inhibits M
23c
6precipitation in drawing process, favourable to creep rupture strength; High Cr jessop nitrogen content prepared by the present invention is suitable, not only form the strengthening phase of tiny and stable VN and NbN, and stopped Z phase under arms the later stage precipitation with grow up, avoid consuming excessively of MX phase and the weakening of the dispersion-strengthened action produced, reduce the probability that Creep hole is formed, restrained effectively the reduction of long term high temperature creep rupture strength; High Cr jessop molybdenum content prepared by the present invention is 0.8 ~ 1.5wt%, W content is 1.5 ~ 2.2wt%, requires that the total amount of W+Mo is 2.8 ~ 3.2wt% simultaneously, has given full play to the compound solid solution strengthening of W, Mo and the precipitation strength effect of Laves phase.
High Cr jessop prepared by the present invention 100000 hours creep rupture strengths under 650 DEG C of conditions are greater than 100MPa, are significantly higher than the creep rupture strength (53MPa) of existing the strongest 9-12Cr jessop (i.e. P92 steel) under similarity condition.
Therefore, the present invention is applicable to structural steel and the component steel that working temperature is 650 DEG C, be specially adapted to manufacture working temperature be 650 DEG C ultra supercritical steam turbine, oil engine, high temperature chemical industry equipment and nuclear-plant.
Accompanying drawing explanation
Fig. 1 is the XRD line spectrum of a kind of high Cr jessop former state extraction precipitate prepared by the present invention;
The XRD line spectrum of Fig. 2 rear sample extraction precipitate for Cr jessop creep 5787.1h high shown in Fig. 1 ruptures;
Stress-Larson-Miller comparison diagram that Fig. 3 is Cr jessop high shown in Fig. 1 and P92 steel.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described, the restriction not to its protection domain.
embodiment 1
A kind of high Cr jessop and preparation method thereof.Chemical composition and the content thereof of described high Cr jessop are: Cr is 8.5 ~ 9.0wt%; Co is 2.5 ~ 3.0wt%; W+Mo is 3.0 ~ 3.3wt%, and wherein W is 2.0 ~ 2.5wt%, Mo is 0.5 ~ 1.0wt%; V is 0.15 ~ 0.2wt%; Nb is 0.05 ~ 0.08wt%; C is 0.001 ~ 0.006wt%; N is 0.03 ~ 0.05wt%; B is 0.003 ~ 0.007wt%; Surplus is iron and inevitable impurity.
Prepare burden by the chemical composition of described high Cr jessop and content thereof, melting in vacuum induction furnace, is cast into steel ingot, is rolled into sheet material; Normalizing 0.8 ~ 1.0 hour under 1050 ~ 1080 DEG C of conditions again, then tempering 0.8 ~ 1.0 hour under 760 ~ 780 DEG C of conditions, furnace cooling, obtained high Cr jessop.
embodiment 2
A kind of high Cr jessop and preparation method thereof.Chemical composition and the content thereof of described high Cr jessop are: Cr is 9.0 ~ 9.5wt%; Co is 3.0 ~ 3.5wt%; W+Mo is 2.8 ~ 3.0wt%, and wherein W is 1.5 ~ 2.0wt%, Mo is 1.0 ~ 1.5wt%; V is 0.2 ~ 0.25wt%; Nb is 0.08 ~ 0.1wt%; C is 0.006 ~ 0.01wt%; N is 0.01 ~ 0.03wt%; B is 0.007 ~ 0.01wt%; Surplus is iron and inevitable impurity.
Prepare burden by the chemical composition of described high Cr jessop and content thereof, melting in vacuum induction furnace, is cast into steel ingot, is rolled into sheet material; Normalizing 1.0 ~ 1.2 hours under 1080 ~ 1100 DEG C of conditions again, then tempering 1.0 ~ 1.2 hours under 780 ~ 800 DEG C of conditions, furnace cooling, obtained high Cr jessop.
embodiment 3
A kind of high Cr jessop and preparation method thereof.Chemical composition and the content thereof of described high Cr jessop are: Cr is 8.8 ~ 9.2wt%; Co is 2.7 ~ 3.2wt%; W+Mo is 2.9 ~ 3.2wt%, and wherein W is 1.8 ~ 2.3wt%, Mo is 0.8 ~ 1.3wt%; V is 0.18 ~ 0.23wt%; Nb is 0.06 ~ 0.08wt%; C is 0.003 ~ 0.007wt%; N is 0.02 ~ 0.04wt%; B is 0.005 ~ 0.008wt%; Surplus is iron and inevitable impurity.
Prepare burden by the chemical composition of described high Cr jessop and content thereof, melting in vacuum induction furnace, is cast into steel ingot, is rolled into sheet material; Normalizing 0.9 ~ 1.1 hour under 1060 ~ 1090 DEG C of conditions again, then tempering 0.9 ~ 1.1 hour under 770 ~ 790 DEG C of conditions, furnace cooling, obtained high Cr jessop.
The present invention compared with prior art, has the following advantages:
Fig. 1 is the XRD line spectrum of a kind of high Cr jessop former state extraction precipitate prepared by embodiment 1.As can be seen from Figure 1, M is not had
23c
6phase, illustrates that this high Cr jessop carbon content prepared by embodiment 1 is low, inhibits M
23c
6precipitation in drawing process, favourable to creep rupture strength;
Fig. 2 is the XRD line spectrum of the creep test 5787.1h fracture rear sample extraction precipitate under 650 DEG C/190MPa condition of the jessop shown in Fig. 1.From Fig. 1 and Fig. 2 in general, in drawing process, separated out MX phase, separated out Laves phase in creep process and do not had Z phase to separate out in the creep later stage.In view of this, this high Cr jessop nitrogen content prepared by embodiment 1 is suitable, not only form the strengthening phase of tiny and stable VN and NbN, and stopped Z phase under arms the later stage precipitation with grow up, avoid consuming excessively of MX phase and the weakening of the dispersion-strengthened action produced, reduce the probability that Creep hole is formed, restrained effectively the reduction of long term high temperature creep rupture strength.
High Cr jessop molybdenum content prepared by this embodiment is 0.8 ~ 1.5wt%, W content is 1.5 ~ 2.2wt%, requires that the total amount of W+Mo is 2.8 ~ 3.2wt% simultaneously, has given full play to the compound solid solution strengthening of W, Mo and the precipitation strength effect of Laves phase.
Stress-Larson-Miller parameters relationship comparison diagram that Fig. 3 is a kind of high Cr jessop shown in Fig. 1 and P92 steel.As can be seen from Figure 3, high Cr jessop prepared by the present invention 100000 hours creep rupture strengths under 650 DEG C of conditions are greater than 100MPa, are significantly higher than the creep rupture strength (53MPa) of existing the strongest 9-12Cr jessop (i.e. P92 steel) under similarity condition.
Therefore, the present invention is applicable to structural steel and the component steel that working temperature is 650 DEG C, be specially adapted to manufacture working temperature be 650 DEG C ultra supercritical steam turbine, oil engine, high temperature chemical industry equipment and nuclear-plant.
Claims (2)
1. a high Cr jessop, is characterized in that the chemical composition of described high Cr jessop and content thereof are: Cr is 8.5 ~ 9.5wt%; Co is 2.5 ~ 3.5wt%; W+Mo is 2.8 ~ 3.3wt%, and wherein W is 1.5 ~ 2.5wt%, Mo is 0.5 ~ 1.5wt%; V is 0.15 ~ 0.25wt%; Nb is 0.05 ~ 0.1wt%; C is 0.001 ~ 0.01wt%; N is 0.01 ~ 0.05wt%; B is 0.003 ~ 0.01wt%; Surplus is iron and inevitable impurity.
2. the preparation method of high Cr jessop as claimed in claim 1, it is characterized in that preparing burden by the chemical composition of described high Cr jessop and content thereof, melting in vacuum induction furnace, is cast into steel ingot, is rolled into sheet material; Normalizing 0.8 ~ 1.2 hour under 1050 ~ 1100 DEG C of conditions again, then tempering 0.8 ~ 1.2 hour under 760 ~ 800 DEG C of conditions, furnace cooling, obtained high Cr jessop.
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| CN201510190201.7A CN104726779B (en) | 2015-04-21 | 2015-04-21 | A kind of high Cr jessop and preparation method thereof |
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| CN201510190201.7A CN104726779B (en) | 2015-04-21 | 2015-04-21 | A kind of high Cr jessop and preparation method thereof |
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| CN104726779A true CN104726779A (en) | 2015-06-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845078A (en) * | 2018-05-30 | 2018-11-20 | 中国特种设备检测研究院 | Station boiler high temperature component creep life prediction technique |
| CN109554629A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of ultra supercritical coal-fired unit steel and preparation method thereof |
| JP7428822B2 (en) | 2020-07-30 | 2024-02-06 | シャンハイ エレクトリック パワー ジェネレーション エクィップメント カンパニー リミテッド | Heat-resistant steel for steel pipes and castings |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030024609A1 (en) * | 2000-12-26 | 2003-02-06 | Masahiko Morinaga | High cr ferritic heat resistance steel |
| CN102268603A (en) * | 2011-08-05 | 2011-12-07 | 武汉科技大学 | High-Al ferritic heat-resistant steel |
| CN103131951A (en) * | 2011-11-24 | 2013-06-05 | 江苏星火特钢有限公司 | Ferrite heat-resistant steel |
-
2015
- 2015-04-21 CN CN201510190201.7A patent/CN104726779B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030024609A1 (en) * | 2000-12-26 | 2003-02-06 | Masahiko Morinaga | High cr ferritic heat resistance steel |
| CN102268603A (en) * | 2011-08-05 | 2011-12-07 | 武汉科技大学 | High-Al ferritic heat-resistant steel |
| CN103131951A (en) * | 2011-11-24 | 2013-06-05 | 江苏星火特钢有限公司 | Ferrite heat-resistant steel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109554629A (en) * | 2017-09-27 | 2019-04-02 | 宝山钢铁股份有限公司 | A kind of ultra supercritical coal-fired unit steel and preparation method thereof |
| CN108845078A (en) * | 2018-05-30 | 2018-11-20 | 中国特种设备检测研究院 | Station boiler high temperature component creep life prediction technique |
| JP7428822B2 (en) | 2020-07-30 | 2024-02-06 | シャンハイ エレクトリック パワー ジェネレーション エクィップメント カンパニー リミテッド | Heat-resistant steel for steel pipes and castings |
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| CN104726779B (en) | 2016-09-14 |
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