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CN102877002A - Heat resistant steel for boiler parts and manufacture method of heat resistant steel - Google Patents

Heat resistant steel for boiler parts and manufacture method of heat resistant steel Download PDF

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CN102877002A
CN102877002A CN2012104206201A CN201210420620A CN102877002A CN 102877002 A CN102877002 A CN 102877002A CN 2012104206201 A CN2012104206201 A CN 2012104206201A CN 201210420620 A CN201210420620 A CN 201210420620A CN 102877002 A CN102877002 A CN 102877002A
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high temperature
boiler component
sample
temperature steel
content
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章磊
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Abstract

The invention relates to heat resistant steel for boiler parts. On the basis of the traditional heat resistant steel, elements such as Zr, Hf, Ta and Al are added, elements such as V and Co are reduced, the content of Cr is lowered, the manufacture method is improved, different chemical elements are added in batches and secondary tempering and annealing are carried out under special conditions, therefore, the boiler parts have high-temperature durability and the creep property at a temperature of 960 DEG C and above, and have better corrosion resistance and oxidization resistance.

Description

A kind of high temperature steel for the boiler component and preparation method thereof
Technical field
The present invention relates to a kind of high temperature steel, especially a kind of high temperature steel for the boiler component and preparation method thereof.
Background technology
Development along with prior art, in order further to increase the work-ing life of boiler component, increase the power of boiler, further improved furnace temperature, in this case, selecting a kind ofly just becomes the task of top priority at 960 degree and the above material that still has high temperature resistant persistence and creep properties thereof, and high temperature steel of the prior art with this understanding high temperature resistant persistence and creep properties all can significantly reduce, and erosion resistance and oxidation-resistance are lower.
Summary of the invention
The invention provides a kind of high temperature steel for the boiler component, form and making method by specific chemical element, make the boiler component at 960 degree and when above, still have good high temperature durability and creep properties, and erosion resistance and oxidation-resistance are fine.
The present invention has added the elements such as Zr, Hf, Ta, Al on the basis of existing high temperature steel, the elements such as V, Co have been reduced, reduced the content of Cr, improved making method, add in batches different chemical elements and carry out under given conditions double tempering and annealing, improve by this, make the boiler component have good high temperature durability and creep properties at 960 degree and when above under the condition, and have good erosion resistance and oxidation-resistance.
The invention provides a kind of high temperature steel for the boiler component, it is characterized in that: the chemical constitution of described steel is below to be all weight percent:
C：0.02-0.4，Ta：0.8-1.0，Nb：0.2-0.3，W：2.5-3.8，N：0.1-0.2，B：0.02-0.04，Si：0.2-0.4，Cu：0.6-0.7，Al：0.2-0.23，Ni：2.2-3.2，Cr：2.6-4.8，Zr：1.9-2.7，Hf：0.3-0.6，Mn：0.4-0.9，Mo：2.0-3.0，
Surplus is Fe and impurity thereof, wherein 8: 1 〉=Zr: Hf 〉=5: 1,3.5: 1 〉=Cu: Al 〉=3: 1, Zr+Hf+Ta+Nb+Ni 〉=6.0.
Preferred scheme is content of impurities≤0.1.
Preferred scheme is in the impurity:
P≤0.01，S≤0.01，Zn≤0.005，Sb≤0.01。
Preferred scheme is for also comprising Re, and Re content is 0.1-0.4.
Preferred scheme is that Re is Ce and Y, Ce: Y 〉=3: 1.
The present invention also provides a kind of making to be used for the method for the high temperature steel of boiler component, mainly is comprised of following steps:
(1) with cast iron just refining in non-vacuum induction furnace, when treating that cast iron begins to melt, adds W, Zr, Hf, Nb, Ta, the Ni element when cast iron melts fully, adds Si, Cu, Mn, Mo, B, Cr, Al, cast iron melts adding C and N after 30 minutes fully, and the ratio of regulating each element, C:0.02-0.4, Ta:0.8-1.0, Nb:0.2-0.3, W:2.5-3.8, N:0.1-0.2, B:0.02-0.04, Si:0.2-0.4, Cu:0.6-0.7, Al:0.2-0.23, Ni:2.2-3.2, Cr:2.6-4.8, Zr:1.9-2.7, Hf:0.3-0.6, Mn:0.4-0.9, Mo:2.0-3.0, surplus is Fe and impurity thereof, wherein 8: 1 〉=Zr: Hf 〉=5: 1,3.5: 1 〉=Cu: Al 〉=3: 1, Zr+Hf+Ta+Nb+Ni 〉=6.0, solution casting becomes consumable electrode;
(2) with consumable electrode remelting refining in electroslag furnace, further the content of impurity reduction element makes it meet design requirements, makes ESR ingot;
(3) ESR ingot is made the boiler component, whirlpool boiler component are carried out anneal, treatment step and processing parameter are:
The boiler component are heated to 1250 degree, are incubated after 6 hours, insulation 800 degree are incubated 24 hours in annealing furnace, are cooled to normal temperature, further are heated to 950 degree, are incubated after 3 hours, and insulation 750 degree are incubated 8 hours in annealing furnace, are cooled to normal temperature.
Preferred scheme is impurity element total content≤0.1.
Preferred scheme is in the impurity element:
P≤0.01，S≤0.01，Zn≤0.005，Sb≤0.01。
Preferred scheme is in the step (1), when cast iron melts fully, also be added with Re, and Re content is 0.1-0.4.
Preferred scheme is that Re is Ce and Y, Ce: Y 〉=3: 1.
Sample of the present invention process under 960 degree conditions detects:
Yield strength σ 0.02 〉=630N/mm2
Tensile strength sigma b 〉=930N/mm2
Elongation δ 〉=10%
Relative reduction in area ψ 〉=43%
Ballistic work AKv 〉=40J
Sample of the present invention is 960 degree in temperature, and stress is that process detects under the 200N/mm2 condition:
Rupture time (Hr) 〉=135 hour.
Of the present inventionly detect by the salt mist experiment method: 10%NaCl, temperature 960 degree, under the PH7.2-7.4 condition, carry out continuously spraying experiment in seven days, product surface of the present invention is smooth, glossy, without rust spot.
The high temperature steel that is used for the boiler component that the present invention makes by specific chemical constitution and manufacture craft under 960 degree temperature, has good high-temperature and durable and creep properties, and has good erosion resistance and oxidation-resistance.
Embodiment
Below the present invention is further detailed explanation.
Embodiment 1
Following table is five samples, and the content of chemical element is as follows in each sample:
Prescription C Cr Zr Hf Ta Nb Mn Mo W N B Si Cu Ni Al
Sample 1 0.03 2.6 1.9 0.3 0.8 0.3 0.4 2.3 2.6 0.2 0.02 0.2 0.7 2.4 0.2
Sample 2 0.05 4.2 2.6 0.4 0.9 0.2 0.7 3.0 2.5 0.15 0.03 0.4 0.6 2.6 0.2
Sample 3 0.1 4.6 2.7 0.5 1.0 0.3 0.9 2.4 2.9 0.17 0.04 0.4 0.7 3.2 0.22
Sample 4 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.6 2.8 0.2
Sample 5 0.4 4.8 2.3 0.3 0.9 0.2 0.5 2.8 3.6 0.18 0.02 0.3 0.7 3.0 0.21
Under 960 degree conditions, pressure is 18MPa to sample 1-5, and stress is 200N/mm 2Condition under detect, the result is as follows:
σ 0.02 σ b δ ψ AKv Hr
Sample 1 632 932 14 43 42 136
Sample 2 646 945 13 46 44 138
Sample 3 689 968 12 53 48 142
Sample 4 673 979 14 51 43 143
Sample 5 631 941 11 52 45 137
By the above results and contrast, can learn, product high temperature durability of the present invention and creep properties all are significantly improved, especially under 960 degree working conditions.
Embodiment 2
The present embodiment verifies that mainly the ratio of Cu, Al on the impact of its performance, reconciles the ratio of Cu, Al on the basis of sample 4, is labeled as standard specimen, sample 41, sample 42, sample 43, sample 44, sample 45, sample 46,47,48:
Prescription C Cr Zr Hf Ta Nb Mn Mo W N B Si Cu Ni Al
Standard specimen 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.6 2.8 0.2
Sample 41 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.2 2.8 0.1
Sample 42 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.4 2.8 0.15
Sample 43 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.5 2.8 0.18
Sample 44 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.7 2.8 0.23
Sample 45 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.8 2.8 0.25
Sample 46 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.9 2.8 0.3
Sample 47 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.6 2.8 0.23
Sample 48 0.2 2.6 2.6 0.5 0.8 0.2 0.4 2.5 3.8 0.16 0.03 0.3 0.6 2.8 0.21
Under 960 degree conditions, pressure is 18MPa to sample 41-48, and stress is 200N/mm 2Condition under detect, the result is as follows:
σ 0.02 σ b δ ψ AKv Hr
Standard specimen 673 979 14 51 43 143
Sample 41 672 973 12 52 42 112
Sample 42 675 972 11 49 46 116
Sample 43 671 969 15 47 44 118
Sample 44 673 980 16 53 45 142
Sample 45 674 979 14 51 46 143
Sample 46 670 981 14 51 40 121
Sample 47 672 983 15 54 40 122
Sample 48 676 975 13 52 43 124
By the above results and contrast, can learn, at Cu content at 0.6-0.7, and Al content between 0.2-0.23 and 3.5: 1 〉=Cu: Al 〉=3: 1 o'clock, rupture time is the longest, otherwise the rupture time can affect its high temperature the time.
By above similar experiment, detect proof Zr content 1.9-2.7, Hf content 0.3-0.6, and 8: 1 〉=Zr: Hf 〉=5: 1 o'clock, tensile strength is best under hot conditions.
By above similar experiment, detect proof Ta content 0.8-1.0, Nb content 0.2-0.3, Ni content 2.2-3.2, Zr content 1.9-2.7, Hf content 0.3-0.6, and Zr+Hf+Ta+Nb+Ni 〉=6.0, its elongation and relative reduction in area are best.
Embodiment 3
The main checked for impurities of the present embodiment adds respectively following impurity to the impact of its characteristic on the basis of sample 3, be labeled as sample 31, sample 32, and sample 33:
P S Zn Sb
Sample 31 0.01 0.01 0.005 0.01
Sample 32 0.02 0.02 0.012 0.02
Sample 33 0.02 0.02 0.030 0.02
Under 960 degree conditions, pressure is 18MPa to sample 31-33, and stress is 200N/mm 2Condition under detect, the result is as follows:
σ 0.02 σ b δ ψ AKv Hr
Sample 31 689 968 12 53 48 142
Sample 32 672 892 10 49 42 134
Sample 33 662 632 8 42 36 112
By above result, can learn, in P≤0.01, S≤0.01, Zn≤0.005 in the situation of Sb≤0.01, does not basically affect performance, otherwise will have a strong impact on performance, especially in the situation that the Zn increase.
Embodiment 4
The present embodiment Re (rare earth element) adds respectively following impurity to the impact of its characteristic on the basis of sample 1, be labeled as sample 11, sample 12, and sample 13:
Rare earth (total amount) Ce Y Other rare earth element
Sample 11 0.04 Arbitrarily Arbitrarily Contain
Sample 12 0.04 0.03 0.01 Do not contain
Sample 13 0.04 0.01 0.03 Do not contain
Under 960 degree conditions, pressure is 18MPa to sample 11-13, and stress is 200N/mm 2Condition under detect:
σ 0.02 σ b δ ψ AKv Hr
Sample 11 646 962 15 46 48 143
Sample 12 683 999 18 51 54 156
Sample 13 651 962 14 43 47 145
By above result, can learn, add Re, can improve the performance of sample, especially add Ce and Y, particularly Ce: Y 〉=3: 1 o'clock, performance is better.
Embodiment 5
On the basis of sample 2, make by diverse ways, be designated as respectively sample 21, sample 22, sample 23, sample 24:
Ordinary method of the present invention is with cast iron just refining in non-vacuum induction furnace, and after cast iron dissolved fully, all chemical elements of disposable adding were reconciled the content of each element, make consumable electrode; And carry out the electroslag furnace remelting refining, and make turbine component, be the melting method of sample 21;
On the basis of ordinary method, when treating that cast iron begins to melt, add W, Zr, Hf, Nb, Ta, the Ni element, when cast iron melts fully, add Si, Cu, Mn, Mo, B, Cr, Al, cast iron melts adding C and N after 30 minutes fully, and solution casting becomes consumable electrode to be the melting method of sample 22;
On the basis of ordinary method, the boiler component are heated to 1250 degree, are incubated after 6 hours, insulation 800 degree in annealing furnace, be incubated 24 hours, be cooled to normal temperature, further be heated to 950 degree, be incubated after 3 hours, insulation 750 degree in annealing furnace, be incubated 8 hours, be cooled to normal temperature, be the melting method of sample 23;
On the basis of ordinary method, when treating that cast iron begins to melt, add W, Zr, Hf, Nb, Ta, the Ni element is when cast iron melts fully, add Si, Cu, Mn, Mo, B, Cr, Al, cast iron melts fully after 30 minutes and to add C and N,, and the boiler component are heated to 1250 degree, be incubated after 6 hours, insulation 800 degree are incubated 24 hours in annealing furnace, are cooled to normal temperature, further be heated to 950 degree, be incubated after 3 hours, insulation 750 degree are incubated 8 hours in annealing furnace, be cooled to normal temperature, be the melting method of sample 24.
σ 0.02 σ b δ ψ AKv Hr
Sample 21 588 893 11 39 39 116
Sample 22 611 903 13 42 42 125
Sample 23 601 912 13 41 40 123
Sample 24 673 979 14 51 43 143
Can learn by above result, add in batches different chemical elements, and carry out second annealing and process, can improve the performance of product.
Above content be in conjunction with structure of the present invention and working process to its further description of doing, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.

Claims (10)

1. high temperature steel that is used for the boiler component, it is characterized in that: the chemical constitution of described steel is below to be all weight percent:
C：0.02-0.4，Ta：0.8-1.0，Nb：0.2-0.3，W：2.5-3.8，N：0.1-0.2，B：0.02-0.04，Si：0.2-0.4，Cu：0.6-0.7，Al：0.2-0.23，Ni：2.2-3.2，Cr：2.6-4.8，Zr：1.9-2.7，Hf：0.3-0.6，Mn：0.4-0.9，Mo：2.0-3.0，
Surplus is Fe and impurity thereof, wherein 8: 1 〉=Zr: Hf 〉=5: 1,3.5: 1 〉=Cu: Al 〉=3: 1, Zr+Hf+Ta+Nb+Ni 〉=6.0.
2. the high temperature steel for the boiler component according to claim 1 is characterized in that: described content of impurities≤0.1.
3. the high temperature steel for the boiler component according to claim 2 is characterized in that: in the described impurity:
P≤0.01，S≤0.01，Zn≤0.005，Sb≤0.01。
4. usefulness according to claim 1 is used for the high temperature steel of boiler component, and it is characterized in that: also comprise Re, Re content is 0.1-0.4.
5. the high temperature steel for the boiler component according to claim 4, it is characterized in that: described Re is Ce and Y, Ce: Y 〉=3: 1.
6. a making is used for the method for the high temperature steel of boiler component, mainly is comprised of following steps:
(1) with cast iron just refining in non-vacuum induction furnace, when treating that cast iron begins to melt, adds W, Zr, Hf, Nb, Ta, the Ni element when cast iron melts fully, adds Si, Cu, Mn, Mo, B, Cr, Al, cast iron melts adding C and N after 30 minutes fully, and the ratio of regulating each element, C:0.02-0.4, Ta:0.8-1.0, Nb:0.2-0.3, W:2.5-3.8, N:0.1-0.2, B:0.02-0.04, Si:0.2-0.4, Cu:0.6-0.7, Al:0.2-0.23, Ni:2.2-3.2, Cr:2.6-4.8, Zr:1.9-2.7, Hf:0.3-0.6, Mn:0.4-0.9, Mo:2.0-3.0, surplus is Fe and impurity thereof, wherein 8: 1 〉=Zr: Hf 〉=5: 1,3.5: 1 〉=Cu: Al 〉=3: 1, Zr+Hf+Ta+Nb+Ni 〉=6.0, solution casting becomes consumable electrode;
(2) with consumable electrode remelting refining in electroslag furnace, further the content of impurity reduction element makes it meet design requirements, makes ESR ingot;
(3) ESR ingot is made the boiler component, whirlpool boiler component are carried out anneal, treatment step and processing parameter are:
The boiler component are heated to 1250 degree, are incubated after 6 hours, insulation 800 degree are incubated 24 hours in annealing furnace, are cooled to normal temperature, further are heated to 950 degree, are incubated after 3 hours, and insulation 750 degree are incubated 8 hours in annealing furnace, are cooled to normal temperature.
7. making according to claim 6 is used for the method for the high temperature steel of boiler component, it is characterized in that: described impurity element total content≤0.1.
8. making according to claim 7 is used for the method for the high temperature steel of boiler component, it is characterized in that: in the described impurity element:
P≤0.01，S≤0.01，Zn≤0.005，Sb≤0.01。
9. making according to claim 6 is used for the method for the high temperature steel of boiler component, it is characterized in that: in the described step (1), when cast iron melts fully, also be added with Re, and Re content is 0.1-0.4.
10. making according to claim 9 is used for the method for the high temperature steel of boiler component, and it is characterized in that: described Re is Ce and Y, Ce: Y 〉=3: 1.
CN2012104206201A 2012-10-24 2012-10-24 Heat resistant steel for boiler parts and manufacture method of heat resistant steel Pending CN102877002A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104388839A (en) * 2014-11-05 2015-03-04 无锡阳工机械制造有限公司 Alloy for steam turbine rotor
CN117305726A (en) * 2023-08-21 2023-12-29 北京首钢吉泰安新材料有限公司 Heat-corrosion-resistant steel alloy and preparation method and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55122856A (en) * 1979-03-10 1980-09-20 Daido Steel Co Ltd High chromium type heat resistant steel with superior high temperature property
JPS60155648A (en) * 1984-01-25 1985-08-15 Nippon Kokan Kk <Nkk> Heat resistant ferritic steel having high toughness
JPS6362848A (en) * 1986-09-04 1988-03-19 Mitsubishi Heavy Ind Ltd Low-alloy heat-resistant steel having high strength
EP0787813B1 (en) * 1996-02-10 1998-12-02 Sumitomo Metal Industries, Ltd. A low mn-low Cr ferritic heat resistant steel excellent in strength at elevated temperatures
US20030188812A1 (en) * 2001-04-19 2003-10-09 Masaki Taneike Ferritic heat-resistant steel and method for production thereof
JP2004211189A (en) * 2003-01-08 2004-07-29 Mitsubishi Heavy Ind Ltd Welding material, welded joint, and high-temperature heat-resistant member for high-strength heat-resistant steel
US20040191109A1 (en) * 2003-03-26 2004-09-30 Maziasz Philip J. Wrought stainless steel compositions having engineered microstructures for improved heat resistance

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55122856A (en) * 1979-03-10 1980-09-20 Daido Steel Co Ltd High chromium type heat resistant steel with superior high temperature property
JPS60155648A (en) * 1984-01-25 1985-08-15 Nippon Kokan Kk <Nkk> Heat resistant ferritic steel having high toughness
JPS6362848A (en) * 1986-09-04 1988-03-19 Mitsubishi Heavy Ind Ltd Low-alloy heat-resistant steel having high strength
EP0787813B1 (en) * 1996-02-10 1998-12-02 Sumitomo Metal Industries, Ltd. A low mn-low Cr ferritic heat resistant steel excellent in strength at elevated temperatures
US20030188812A1 (en) * 2001-04-19 2003-10-09 Masaki Taneike Ferritic heat-resistant steel and method for production thereof
JP2004211189A (en) * 2003-01-08 2004-07-29 Mitsubishi Heavy Ind Ltd Welding material, welded joint, and high-temperature heat-resistant member for high-strength heat-resistant steel
US20040191109A1 (en) * 2003-03-26 2004-09-30 Maziasz Philip J. Wrought stainless steel compositions having engineered microstructures for improved heat resistance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104388839A (en) * 2014-11-05 2015-03-04 无锡阳工机械制造有限公司 Alloy for steam turbine rotor
CN117305726A (en) * 2023-08-21 2023-12-29 北京首钢吉泰安新材料有限公司 Heat-corrosion-resistant steel alloy and preparation method and application thereof

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Application publication date: 20130116