CN102828108A - Low-cost high-strength steel plate for shipbuilding and manufacturing method thereof - Google Patents
Low-cost high-strength steel plate for shipbuilding and manufacturing method thereof Download PDFInfo
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- CN102828108A CN102828108A CN2011101600803A CN201110160080A CN102828108A CN 102828108 A CN102828108 A CN 102828108A CN 2011101600803 A CN2011101600803 A CN 2011101600803A CN 201110160080 A CN201110160080 A CN 201110160080A CN 102828108 A CN102828108 A CN 102828108A
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- shipbuilding
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 55
- 239000010959 steel Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims abstract description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims 1
- 229910052758 niobium Inorganic materials 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000011574 phosphorus Substances 0.000 abstract 1
- 239000013078 crystal Substances 0.000 description 12
- 238000001953 recrystallisation Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 229910001566 austenite Inorganic materials 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010955 niobium Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- 229910000592 Ferroniobium Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention provides a low-cost high-strength steel plate for shipbuilding and a manufacturing method thereof, and the steel plate comprises the following chemical components: c: 0.05-0.16%, Si: 0.10-0.50%, Mn: 0.90 to 1.50 percent of the total weight of the alloy, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S and the balance of Fe and inevitable impurities. The manufacturing method comprises smelting, continuous casting and hot rolling, and is characterized in that the heating temperature of a casting blank is 1100-1150 ℃, high-pressure water is used for removing phosphorus before the casting blank enters a rolling mill, the initial rolling temperature is 1120-1050 ℃, the continuous rolling is performed for 3-5 times, the pass reduction is more than 20%, the first-stage final rolling temperature is 970-1000 ℃, the thickness to be cooled is 2-3 times of the thickness of a finished product, the second-stage initial rolling temperature is 920-950 ℃, the rolling is performed for 5-10 passes, the accumulated deformation is more than 50%, the final rolling temperature is 800-900 ℃, the cooling is performed rapidly after the rolling, the cooling is performed for 5-10 s, the cooling rate is 30-40 ℃/s. The invention does not need to add Nb, V and Ti, and the performance of the steel plate can reach 315N/mm by controlling the rolling and ultra-fast cooling process2Strength grade marine steel requirements.
Description
Technical field
The invention belongs to the thickness specification is the production technology of 10～40mm shipbuilding with steel plate, particularly a kind of low cost, ys greater than the shipbuilding of 315N/mm2 with steel plate and method of manufacture thereof.
Background technology
According to the prediction of World Ship industry to the future market demand, along with the development of shipbuilding, the kind of ship steel and specification will have bigger lifting, and HS, thick specification shipbuilding will constantly rise with the demand of steel plate.
HS is made ship steel not only will have higher intensity, and good toughness plasticity, particularly low-temperature impact toughness will be arranged.Crystal grain thinning is the effective means that improves obdurability.The Iron And Steel Industry application practice has confirmed that controlled rolling and controlled chilling (TMCP) technology can effectively control grain-size, improves obdurability.Ship steel is made in the general recrystallization zone and the two stages controlled rolling of non-recrystallization district and layer cold but (ACC) mode production HS of adopting, and the cold but speed of layer is no more than 10 ℃/S.Make austenite structure wherein bear strong deformation repeatedly in the high temperature austenite recrystallization zone through the multi-pass tandem rolling, utilize in the operation of rolling dynamic recrystallization strengthening mechanism to form evenly tiny austenite recrystallization crystal grain; It is rolling to carry out the multi-pass gross distortion in the non-recrystallization district again, at the inner deformation bands that forms of crystal grain, ferritic forming core point is provided, further crystal grain thinning.Usually use the TMCP technology and will be combined in micro alloying elements such as the Nb that adds 0.02-0.08wt% in the steel, Ti, V,, reach the purpose that over-all propertieies such as crystal grain thinning, precipitation strength are optimized to enlarge austenite non-recrystallization district.It is investigated and read lot of documents, investigators generally believe in the high-strength ship plates all should add the niobium element, and the Nb content of the high-strength ship plates of in " exploitation of DH36 high-strength ship plates and trial-production " literary composition, introducing like Wang Yongran etc. is up to 0.05%.China's ferro-niobium natural resources shortage is mainly from external import.HS is made the quick increase of ship steel demand along with shipbuilding industry; Adopt present HS to make the ship steel production technology and will consume resources such as a large amount of Nb, V, Ti; Impel these cost of material to go up; Make the ship steel production cost thereby increase HS, bring huge cost pressure to steel mill.
Summary of the invention
The objective of the invention is to overcome the deficiency that above-mentioned prior art exists; A kind of microalloy element Nb, V, Ti of not adding is provided, adopt that low cost, toughness plasticity that controlled rolling+supper-fast process for cooling is produced are excellent, ys greater than the shipbuilding of 315N/mm2 with steel plate and method of manufacture thereof.
For realizing above-mentioned purpose; The HS shipbuilding that the present invention designed uses the chemical component weight per-cent of steel plate to be: C:0.05%～0.16%; Si:0.10%～0.50%; Mn:0.90%～1.50%, impurity element P≤0.020%, S≤0.015%, surplus is Fe and unavoidable impurities.
Shipbuilding of the present invention is with each alloying constituent mechanism of action of steel plate:
C is a solution strengthening element main in the steel.C content then is difficult to guarantee the intensity of steel if be lower than 0.05%.C content is if be higher than 0.18% welding property and toughness that worsens steel on the other hand.Thereby low-carbon (LC) can reduce the carbide in the source of cracking and improve toughness and reduce ductile-brittle transition temperature, and therefore, C content will be controlled at 0.05%～0.16%.Consider that from economy and product performance angle preferably C content is controlled at 0.07%～0.13%.
Mn is intensity and the flexible bioelement that guarantees steel, and Mn combines formation MnS with S, avoids the formation FeS of crystal boundary place and the thermal crack that causes, and Mn also was good reductor and increased hardening capacity the while.If Mn content is lower than 0.90%, be difficult to then guarantee above-mentioned effect that if Mn content is too high then can to worsen welding property, so Mn content should be controlled at 0.90%～1.50%.
Si is a reductor very strong in the steel, but too high levels will reduce toughness and welding property.The Si of solid solution form can improve ys.Si content of the present invention is controlled at 0.10%～0.50%.
P and S are inevitable detrimental impurity in the steel, and therefore the toughness of their existence meeting severe exacerbation steel will take measures to make P and S content in the steel to reduce as far as possible.According to the present invention, the highest P content is limited in 0.020%, and the highest S content is limited in 0.015%.
HS shipbuilding according to the invention comprises smelting, continuous casting and hot rolling with the method for manufacture of steel plate, guarantees the purity of steel after the external refining, and the Heating temperature that it is characterized in that strand is 1100～1150 ℃, and is tiny with the original austenite grains size that guarantees steel; Strand uses dephosphorize by high pressure water before getting into milling train, and high pressure water pressure is greater than 15MPa, to guarantee the supper-fast cooled surface quality of steel plate; Adopt recrystallization zone and non-recrystallization district two stages controlled rolling technology; Start rolling temperature is 1120～1050 ℃; Continuous rolling 3～5 passages, reduction in pass guarantee austenite perfect recrystallization greater than 20%; One stage finishing temperature is controlled at 970～1000 ℃, treats that temperature thickness is 2～3 times of finished product thickness; Two-stage non-recrystallization district start rolling temperature is 920～950 ℃; Rolling 5～10 passages; Cumulative deformation is greater than 50%, and finishing temperature is controlled at 800～900 ℃, makes the equally distributed deformation bands of the inner formation of austenite crystal; More forming core point is provided during phase transformation, more tiny with ferrite crystal grain after guaranteeing phase transformation; Roll the back and get into supper-fast cooling system rapidly; Near instantaneous being cooled to the transformation temperature suppressed the recrystallize austenite crystal and grown up, simultaneously through regulating water coolant nozzle aquifer yield and steel plate translational speed controlled chilling speed; To avoid forming martensite and bainite structure; Guarantee the steel plate toughness plasticity, steel plate is at supper-fast cooling system internal cooling 5～10s, and it is 580～650 ℃ that steel plate returns red temperature; The average rate of cooling of steel plate is 30～40 ℃/s, guarantees that austenite changes evenly tiny ferritic+pearlitic structure rapidly into.
Employing the present invention technology need not to add crystal grain thinning element nb, V, Ti and Al in the steel, through controlled rolling and supper-fast process for cooling, just can make plate property reach 315N/mm
2Intensity rank is made the requirement of ship steel, thereby reduces the production cost that HS is made ship steel; Can obtain evenly tiny ferritic+pearlitic structure after two stages controlled rolling+supper-fast cooling, grain fineness number reaches more than 10 grades, and the low-temperature impact property of steel plate also can increase substantially.
Description of drawings
Fig. 1 is the microstructure of the embodiment of the invention 1 steel plate.
Fig. 2 is the microstructure of the embodiment of the invention 4 steel plates.
Fig. 3～Fig. 6 is the microstructure of Comparative Examples 1～4 steel plate.
Embodiment
Through embodiment the present invention is further described below.
Table 1 is the embodiment of the invention, has provided the chemical ingredients of embodiment and Comparative Examples and mainly rolling, cooling parameter and mechanical property thereof in the table.Preceding 8 is to use the present invention's technology to produce the embodiment of low-cost high-strength shipbuilding with steel plate in the table 1.4 of backs are Comparative Examples, have provided existing main rolling parameter and the mechanical property thereof that contains Nb, V, Ti, Al crystal grain thinning elemental composition steel plate.Comparative Examples 1 and 2 does not adopt water-cooled, and the latter is a continuous rolling, not the controlled rolling of two stages; Comparative Examples 3 adopts ultrafast cold, and Comparative Examples 4 adopts the ACC layer but cold.
Composition, technology and the performance of table 1 embodiment of the invention steel
Visible by table 1, use the chemical ingredients of the present invention's technology and the steel plate mechanical property of production technique production and satisfy 315N/mm fully
2Intensity rank is made the requirement of ship steel, with routine produce contain Nb, V, Ti, specific tenacity is suitable mutually for Al crystal grain thinning element steel plate, and low-temperature impact toughness is better.
Claims (2)
1. steel plate is used in a low-cost high-strength shipbuilding; The chemical component weight per-cent that it is characterized in that steel plate is: C:0.05%～0.16%; Si:0.10%～0.50%; Mn:0.90%～1.50%, impurity element P≤0.020%, S≤0.015%, surplus is Fe and unavoidable impurities.
2. the said low-cost high-strength shipbuilding of claim 1 comprises smelting, continuous casting and hot rolling with the method for manufacture of steel plate, and the Heating temperature that it is characterized in that strand is 1100～1150 ℃; Strand gets into the dephosphorize by high pressure water of the preceding applying pressure of milling train greater than 15MPa, adopts the controlled rolling of two stages, 1120～1050 ℃ of start rolling temperatures; Continuous rolling 3～5 passages, reduction in pass is 970～1000 ℃ greater than 20%, one stage finishing temperature; Treat that temperature thickness is 2～3 times of finished product thickness, the two-stage start rolling temperature is 920～950 ℃, rolling 5～10 passages; Cumulative deformation is greater than 50%, and finishing temperature is 800～900 ℃, rolls back cooling rapidly; Cooling 5～10s, rate of cooling is 30～40 ℃/s, it is 580～650 ℃ that steel plate returns red temperature.
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| CN201110160080.3A CN102828108B (en) | 2011-06-14 | 2011-06-14 | Low-cost high-strength steel plate for shipbuilding and manufacturing method thereof |
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| CN201110160080.3A CN102828108B (en) | 2011-06-14 | 2011-06-14 | Low-cost high-strength steel plate for shipbuilding and manufacturing method thereof |
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| CN102828108B CN102828108B (en) | 2014-12-31 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103436811A (en) * | 2013-09-24 | 2013-12-11 | 济钢集团有限公司 | High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof |
| CN104213016A (en) * | 2013-05-29 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Inboard plate high strength steel and production method thereof |
| CN104232868A (en) * | 2014-09-04 | 2014-12-24 | 东北大学 | Optimal controlled rolling method adopting ultra-fast cooling to control Austenite structure |
| CN104878287A (en) * | 2015-06-12 | 2015-09-02 | 武汉钢铁(集团)公司 | Wide and heavy low-cost steel plate having high hot rolling performance and manufacturing method thereof |
| CN108914009A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | Al+Ti system high strength and low cost ship steel and its manufacturing method |
| CN108914010A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | A kind of low-cost high-strength low-alloy steel and its manufacturing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148735A (en) * | 2007-10-17 | 2008-03-26 | 莱芜钢铁集团有限公司 | Method for rolling thick specification low-alloy structure steel plate by using middle and thin plate blank |
| CN101348879A (en) * | 2008-09-02 | 2009-01-21 | 首钢总公司 | 100mm low alloy high strength ultra heavy plate and manufacturing method thereof |
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2011
- 2011-06-14 CN CN201110160080.3A patent/CN102828108B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148735A (en) * | 2007-10-17 | 2008-03-26 | 莱芜钢铁集团有限公司 | Method for rolling thick specification low-alloy structure steel plate by using middle and thin plate blank |
| CN101348879A (en) * | 2008-09-02 | 2009-01-21 | 首钢总公司 | 100mm low alloy high strength ultra heavy plate and manufacturing method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213016A (en) * | 2013-05-29 | 2014-12-17 | 上海梅山钢铁股份有限公司 | Inboard plate high strength steel and production method thereof |
| CN103436811A (en) * | 2013-09-24 | 2013-12-11 | 济钢集团有限公司 | High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof |
| CN103436811B (en) * | 2013-09-24 | 2015-07-15 | 济钢集团有限公司 | High-property super-thick steel plate for 500 MPa-level engineering structure and manufacturing method thereof |
| CN104232868A (en) * | 2014-09-04 | 2014-12-24 | 东北大学 | Optimal controlled rolling method adopting ultra-fast cooling to control Austenite structure |
| CN104878287A (en) * | 2015-06-12 | 2015-09-02 | 武汉钢铁(集团)公司 | Wide and heavy low-cost steel plate having high hot rolling performance and manufacturing method thereof |
| CN108914009A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | Al+Ti system high strength and low cost ship steel and its manufacturing method |
| CN108914010A (en) * | 2018-08-28 | 2018-11-30 | 宝钢湛江钢铁有限公司 | A kind of low-cost high-strength low-alloy steel and its manufacturing method |
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| CN102828108B (en) | 2014-12-31 |
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