CN103343299A - High-strength steel plate for water conservancy and preparation method thereof - Google Patents
High-strength steel plate for water conservancy and preparation method thereof Download PDFInfo
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- CN103343299A CN103343299A CN2013103164564A CN201310316456A CN103343299A CN 103343299 A CN103343299 A CN 103343299A CN 2013103164564 A CN2013103164564 A CN 2013103164564A CN 201310316456 A CN201310316456 A CN 201310316456A CN 103343299 A CN103343299 A CN 103343299A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 81
- 239000010959 steel Substances 0.000 title claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 23
- 238000009826 distribution Methods 0.000 claims description 15
- 238000000137 annealing Methods 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 4
- 238000007669 thermal treatment Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 2
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 15
- 229910052721 tungsten Inorganic materials 0.000 abstract description 2
- 239000013505 freshwater Substances 0.000 description 5
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 5
- 239000007769 metal material Substances 0.000 description 4
- 235000009508 confectionery Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Abstract
The invention discloses a high-strength steel plate for water conservancy and a preparation method thereof. The high-strength steel plate for water conservancy is composed of the following components in percentage by weight: 0.035-0.05% of C, 0.15-0.17% of Si, 1.8-2.0% of Mn, 0.013-0.018% of Ti, at most 0.002% of P, at most 0.002% of S, 1.5-5.2% of Ni, 9.8-15.2% of Cr, 0.05-0.11% of Nb, 0.35-0.42% of Mo, 0.01-0.025% of RE, 0.02-0.08% of Cu, 0.02-0.06% of W, at most 0.0002% of H (limited element), at most 0.004% of N, at most 0.0015% of O and the balance of Fe. The high-strength steel plate with specific microstructure has higher corrosion resistance against Chinese water quality requirements, higher tensile strength and lower yield ratio.
Description
Technical field
The present invention relates to a kind of water conservancy high tensile steel plate and preparation method thereof, the concrete high strength that relates to a kind of resistant water water quality corrosion, particularly high-tensile water conservancy high tensile steel plate and preparation method thereof.
Background technology
In the hydro project technical field, tend to the miscellaneous part of using as sluice or water conservancy with steel plate.In the severe environment that steel plate is in moist many water for a long time, exposes to the weather, sand and dust corrode, very easily produce chemical corrosion, Chinese water quality complexity, sanitary sewage or industrial sewage complicated component very easily produce various chemical corrosions; And the stressed complexity of steel plate, along with the effect of hydraulic pressure and morning and evening tides, its inner tensile, compressive, bending, turn round etc. all can occur and temporal variation, the effect of these complex external forces, except metallic substance is produced the fatigue, steel plate also can have corrosion and the wearing and tearing of particular case.For the steel plate of this working conditions harshness, if do not resist the performance of the problems referred to above, can reduce greatly its work-ing life, thereby influence the safety of hydro project.
China is the country of a shortage of fresh water, but the pollution level that present fresh water water body is subjected to is deeply, scope is wide, has become an outstanding problem in numerous environmental problems.The whole nation seven big water systems are generally polluted, nitrogen, phosphorus heavy contamination in the inland lake, city, and water quality is generally relatively poor, and polluting the fresh water water body has become a kind of typical case of China and general water surrounding.The fresh water water body is the important place that metallic substance is on active service, and after the fresh water water body was polluted, Service Environment changed, and must bring the variation of metallic material corrosion behavior and rule.A large amount of trade effluents and sanitary sewage row people river course and lake, make surface drainage system suffer severe contamination, the deterioration of the ecological environment, the pollution substance that corrodibility such as acid in the water body, alkali, salt and some organism are strong increases, accelerated Corrosion of Metallic Materials speed, therefore, be necessary to develop a kind of steel plate of anti-the sweet corrosion, to reduce the loss owing to sweet corrosion was brought.
Do not mention the problem of sweet corrosion at disclosed standard BS EN1993-5:2007, U.S. mark A572/A572M-07, JIS A5528:2006 and CNS GB/T20933-2007.
Summary of the invention
One of purpose of the present invention is to propose a kind of water conservancy high tensile steel plate;
Two of purpose of the present invention is to propose the preparation method that this water conservancy is used high tensile steel plate.
For reaching this purpose, the present invention by the following technical solutions:
Each component is made up of following weight percentage:
C:0.035～0.05%, Si:0.15～0.17%, Mn:1.8～2.0%, Ti:0.013～0.018%, P :≤0.002%, S :≤0.002%, Ni:1.5～5.2%, Cr:9.8～15.2%, Nb:0.05～0.11%, Mo:0.35～0.42%, RE:0.01～0.025%, Cu:0.02～0.08, W:0.02～0.06, constraint element H≤0.0002%, N≤0.004%, O≤0.0015%, surplus are Fe;
The surface of steel plate acicular ferrite distribution proportion of described high tensile steel plate is 7～12 times in the distribution of its central zone, vertical section, and vertical section center needle columnar ferrite mean particle size is 1/6～1/8 of surface of steel plate mean particle size; Central zone, described vertical section refers to that center, steel plate vertical section is that the center of circle, radius are the zone that 1/3 thickness of slab surrounds; Described surface of steel plate refers to that the steel plate outermost layer is to its thickness in 1/10 place below surface;
The yield strength of described high tensile steel plate is 510～550MPa, and tensile strength is 880～900MPa, and yield tensile ratio is 0.510～0.615.
As preferably: the elongation after fracture of described high tensile steel plate is 18～28% ,-20 ℃ of ballistic work 232～386J.
As preferably: the microtexture of described high tensile steel plate comprises acicular ferrite and island martensite body, and wherein the volume percent of acicular ferrite is 62～78%, and the volume percent of island martensite body is 8.5～11%.
As preferably: each component is made up of following weight percentage:
C:0.038～0.04%, Si:0.16～0.17%, Mn:1.8～1.85%, Ti:0.015～0.016%, P :≤0.002%, S :≤0.002%, Ni:2.5～4.2%, Cr:12.1～14.2%, Nb:0.04～0.10%, Mo:0.385～0.41%, RE:0.018～0.020%, Cu:0.04～0.06, W:0.04～0.06, constraint element H≤0.0001%, N≤0.003%, O≤0.0010%, surplus are Fe;
As preferably: the ratio that the acicular ferrite of the following 1mm section of surface of steel plate accounts for whole section area is 5～8 times in the distribution of its central zone, vertical section.
A kind of water conservancy preparation method of high tensile steel plate is characterized in that: may further comprise the steps:
A) carry out converter smelting according to aforementioned water conservancy with the component content design of high tensile steel plate, carry out continuous casting after LF stove, the refining of VD stove;
B) continuous casting material that step a) is obtained carries out equal thermal treatment, and temperature is controlled in 1100～1200 ℃ scope, insulation 120～140min;
C) blank after coming out of the stove being carried out dephosphorize by high pressure water handles;
D) blank after the dephosphorization is carried out the controlled rolling of two stages immediately, the start rolling temperature of roughing is 1100～1190 ℃, and cumulative deformation is 52～63%, and final rolling temperature is 720～760 ℃, and the finish rolling compression ratio is 5～8 times;
D) steel plate after the finish to gauge carries out water-cooled behind the air cooling, and making steel plate austenitic transformation more than 80% before entry is proeutectoid ferrite;
E) steel plate that obtains after the step d) is carried out the laminar flow cooling.
F) the cooled steel plate of laminar flow is carried out three times 778～800 ℃ anneal, carry out 550～600 ℃ temper then.
Effect of the present invention is:
Specific composition design can further improve distribution and the particle diameter of acicular ferrite; The distribution of acicular ferrite is defined as situation of the present invention can have clear improvement to the erosion resistance of the water in the water conservancy, especially has good resistance to corrosion for the specific water quality of China, improves tensile strength greatly simultaneously, improves the final performance of steel plate; The specific preparation method of the present invention and specific parameter all have good result to the tensile strength of improving high tensile steel plate and yield strength and lower yield ratio; Specific thermal treatment process can be improved each distribution mutually in the microtexture, optimizes performance;
Obtaining of various microtextures of the present invention, use existing preparation method to obtain, but the applicant is by studying the surprised discovery in back for many years by arranging the distribution of acicular ferrite in surface of steel plate and steel plate centre different, its performance difference is very big, and concrete multiple relation and the granularity that are set to the application can have optimum various performance parameters; Can further strengthen various performance parameters by the ratio of regulating island martensite body and acicular ferrite; Plate property of the present invention is superior to have a extensive future.
Embodiment
Embodiment 1
Each component is made up of following weight percentage:
C:0.039%, Si:0.16%, Mn:1.82%, Ti:0.0155%, P :≤0.001%, S :≤0.0002%, Ni:3.8%, Cr:13.1%, Nb:0.08%, Mo:0.388%, RE:0.019%, Cu:0.048%, W:0.048%, constraint element H≤0.00001%, N≤0.003%, O≤0.0010%, surplus are Fe.
The surface of steel plate acicular ferrite distribution proportion of described high tensile steel plate is 9 times in the distribution of its central zone, vertical section, and vertical section center needle columnar ferrite mean particle size is 1/7 of surface of steel plate mean particle size; Central zone, described vertical section refers to that center, steel plate vertical section is that the center of circle, radius are the zone that 1/3 thickness of slab surrounds; Described surface of steel plate refers to that the steel plate outermost layer is to its thickness in 1/10 place below surface;
The yield strength of described high tensile steel plate is 545MPa, and tensile strength is 889MPa, and yield tensile ratio is 0.610.
Embodiment 2:
A) carry out converter smelting according to the concrete component content design of the high-strength line-pipe steel plate of embodiment 1, carry out continuous casting after LF stove, the refining of VD stove;
B) continuous casting material that step a) is obtained carries out equal thermal treatment, and temperature is controlled in 1118 ℃ scope, insulation 130min;
C) blank after coming out of the stove being carried out dephosphorize by high pressure water handles;
D) blank after the dephosphorization is carried out the controlled rolling of two stages immediately, the start rolling temperature of roughing is 1100 ℃, and cumulative deformation is 58%, and final rolling temperature is 750 ℃, and the finish rolling compression ratio is 6 times;
D) steel plate after the finish to gauge carries out water-cooled behind the air cooling, and making steel plate austenitic transformation of 89% before entry is proeutectoid ferrite;
E) steel plate that obtains after the step d) is carried out the laminar flow cooling;
F) the cooled steel plate of laminar flow is carried out three times 780 ℃ anneal, annealing time is 48 minutes for the first time, and annealing time is 92 minutes for the second time, and annealing time is 145 minutes for the third time, carries out 580 ℃ temper then;
Optionally, carry out g) carry out salt bath quenching and handle.
Embodiment 3
Each component is made up of following weight percentage:
C:0.035%, Si:0.15%, Mn:1.8%, Ti:0.015%, P:0.0012%, S:0.0005%, Ni:5.2%, Cr:13.2%, Nb:0.05%, Mo:0.35%, RE:0.022%, Cu:0.06, W:0.04, constraint element H0.0001%, N0.002%, O0.0012%, surplus is Fe;
The surface of steel plate acicular ferrite distribution proportion of described high tensile steel plate is 10 times in the distribution of its central zone, vertical section, and vertical section center needle columnar ferrite mean particle size is 1/6 of surface of steel plate mean particle size; Central zone, described vertical section refers to that center, steel plate vertical section is that the center of circle, radius are the zone that 1/3 thickness of slab surrounds; Described surface of steel plate refers to that the steel plate outermost layer is to its thickness in 1/10 place below surface;
The yield strength of described high tensile steel plate is 545MPa, and tensile strength is 889MPa, and yield tensile ratio is 0.610.
The yield strength of described high tensile steel plate is 550MPa, and tensile strength is 892MPa, and yield tensile ratio is 0.525; Elongation after fracture is 21% ,-20 ℃ of ballistic work 321J.Wherein the volume percent of acicular ferrite is 78%, and the volume percent of island martensite body is 9.2%; The ratio that the acicular ferrite of the following 1mm section of surface of steel plate accounts for whole section area is 6 times in the distribution of its central zone, vertical section.
And by after the too drastic test of Yichang, the Changjiang river section, embodiment 1 and 3 corrosion-resistant time limits predicate 35 times and 38 times of common corrosion-resistant steels (the common corrosion-resistant steel of unqualified above-mentioned element certain content and specific microtexture); After the too drastic test of Shandong Province of Yellow River section, the corrosion-resistant time limit predicates common corrosion-resistant firm 29 times.
Claims (9)
1. water conservancy high tensile steel plate, it is characterized in that: each component is made up of following weight percentage:
C:0.035～0.05%, Si:0.15～0.17%, Mn:1.8～2.0%, Ti:0.013～0.018%, P :≤0.002%, S :≤0.002%, Ni:1.5～5.2%, Cr:9.8～15.2%, Nb:0.05～0.11%, Mo:0.35～0.42%, RE:0.01～0.025%, Cu:0.02～0.08, W:0.02～0.06, constraint element H≤0.0002%, N≤0.004%, O≤0.0015%, surplus are Fe;
The surface of steel plate acicular ferrite distribution proportion of described high tensile steel plate is 7～12 times in the distribution of its central zone, vertical section, and vertical section center needle columnar ferrite mean particle size is 1/6～1/8 of surface of steel plate mean particle size; Central zone, described vertical section refers to that center, steel plate vertical section is that the center of circle, radius are the zone that 1/3 thickness of slab surrounds; Described surface of steel plate refers to that the steel plate outermost layer is to its thickness in 1/10 place below surface;
The yield strength of described high tensile steel plate is 510～550MPa, and tensile strength is 880～900MPa, and yield tensile ratio is 0.510～0.615.
2. high tensile steel plate according to claim 1, it is characterized in that: the elongation after fracture of described high tensile steel plate is 18～28% ,-20 ℃ of ballistic work 232～386J.
3. high tensile steel plate according to claim 1 and 2, it is characterized in that: the microtexture of described high tensile steel plate comprises acicular ferrite and island martensite body, wherein the volume percent of acicular ferrite is 62～78%, and the volume percent of island martensite body is 8.5～11%.
4. high tensile steel plate according to claim 1 and 2, it is characterized in that: each component is made up of following weight percentage:
C:0.038～0.04%, Si:0.16～0.17%, Mn:1.8～1.85%, Ti:0.015～0.016%, P :≤0.002%, S :≤0.002%, Ni:2.5～4.2%, Cr:12.1～14.2%, Nb:0.04～0.10%, Mo:0.385～0.41%, RE:0.018～0.020%, Cu:0.04～0.06, W:0.04～0.06, constraint element H≤0.0001%, N≤0.003%, O≤0.0010%, surplus are Fe.
5. high tensile steel plate according to claim 1 and 2 is characterized in that: the ratio that the acicular ferrite of the following 1mm section of surface of steel plate accounts for whole section area is 5～8 times in the distribution of its central zone, vertical section.
6. each described water conservancy of claim 1～5 is characterized in that: may further comprise the steps with the preparation method of high tensile steel plate:
A) carry out converter smelting according to each described water conservancy of claim 1～5 with the component content design of high tensile steel plate, carry out continuous casting after LF stove, the refining of VD stove;
B) continuous casting material that step a) is obtained carries out equal thermal treatment, and temperature is controlled in 1100～1200 ℃ scope, insulation 120～140min;
C) blank after coming out of the stove being carried out dephosphorize by high pressure water handles;
D) blank after the dephosphorization is carried out the controlled rolling of two stages immediately, the start rolling temperature of roughing is 1100～1190 ℃, and cumulative deformation is 52～63%, and final rolling temperature is 720～760 ℃, and the finish rolling compression ratio is 5～8 times;
D) steel plate after the finish to gauge carries out water-cooled behind the air cooling, and making steel plate austenitic transformation more than 80% before entry is proeutectoid ferrite;
E) to carrying out the laminar flow cooling again after the steel plate heating that obtains after the step d), be cooled to earlier cooling back air cooling fast.
F) the cooled steel plate of laminar flow is carried out three times anneal, annealing temperature is 770～790 ℃ for the first time, annealing time is 38～90 minutes, annealing temperature is 780～800 ℃ for the second time, annealing time is 52～110 minutes, annealing temperature is 790～810 ℃ for the third time, and annealing time is 120～150 minutes, carries out 550～600 ℃ temper then.
7. the described water conservancy of claim 6 is with the preparation method of high tensile steel plate, and it is characterized in that: also pass through step g) after step f): quench treatment, described quench treatment are salt bath quenching.
8. the described water conservancy of claim 6 is with the preparation method of high tensile steel plate, and it is characterized in that: annealing time is 48 minutes for the first time in step f), and annealing time is 92 minutes for the second time, and annealing time is 145 minutes for the third time.
9. the described water conservancy of claim 6 is with the preparation method of high tensile steel plate, and it is characterized in that: the Heating temperature of step e) heating is 770～810 ℃, is cooled to air cooling after the first water-cooled.
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| CN105603334A (en) * | 2016-02-11 | 2016-05-25 | 曹兴奎 | Low-alloy high-strength steel plate for water conservancy and production method thereof |
| CN106382192A (en) * | 2016-10-27 | 2017-02-08 | 李白 | Offshore wind turbine generator |
| CN106401880A (en) * | 2016-10-28 | 2017-02-15 | 李白 | Manufacturing method of offshore wind turbine base |
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| CN105603334A (en) * | 2016-02-11 | 2016-05-25 | 曹兴奎 | Low-alloy high-strength steel plate for water conservancy and production method thereof |
| CN106382192A (en) * | 2016-10-27 | 2017-02-08 | 李白 | Offshore wind turbine generator |
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| CN103343299B (en) | 2015-07-29 |
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