CN106011647A - 460MPa-level extra-thick plate and production method thereof - Google Patents
460MPa-level extra-thick plate and production method thereof Download PDFInfo
- Publication number
- CN106011647A CN106011647A CN201610575680.9A CN201610575680A CN106011647A CN 106011647 A CN106011647 A CN 106011647A CN 201610575680 A CN201610575680 A CN 201610575680A CN 106011647 A CN106011647 A CN 106011647A
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- heavy plate
- special heavy
- 460mpa
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/002—Bainite
-
- 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
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a 460MPa-level extra-thick plate and a production method thereof. Chemical components of the 460MPa-level extra-thick plate comprise, by mass fraction, 0.14%-0.17% of C, 1.40%-1.80% of Mn, 0.15%-0.25% of Si, 0.20%-0.40% of Al, smaller than or equal to 0.01% of S, smaller than or equal to 0.02% of P, larger than or equal to 0.020% of V, larger than or equal to 0.010% of Ti, larger than or equal to 0.020% of Nb and the balance Fe and trace impurity elements. According to the extra-thick plate and the production method of the extra-thick plate, a C-Mn-Nb-V-Ti component system is combined with ultrafast cooling, then the 460MPa-level extra-thick plate with the thickness specification ranging from 60 mm to 100 mm can be produced, the using amount of the microalloy elements of Nb, Ti and V can be effectively reduced, and the production cost is effectively reduced. According to the method, the C-Mn-Nb-V-Ti component design is combined with the post-rolling ultrafast cooling technology, and cost is effectively reduced; and in order to guarantee the plate type, pre-heating straightening before ultrafast cooling is adopted, the cooling parameters are dynamically controlled through ultrafast cooling, and subsequently, the straightening force ranging from 8000 kN to 10000 kN is adopted for guaranteeing the plate type. Thus, the method has the beneficial effects of being low in cost, stable in process, excellent in plate type and performance and the like.
Description
Technical field
The present invention relates to a kind of its production method of special heavy plate, especially a kind of 460MPa rank special heavy plate and production method thereof.
Background technology
Special heavy plate is mainly used in the industries such as marine engineering equipment, skyscraper and container.Along with the increase of steel plate thickness, rolling special heavy plate continuous casting billet size increases accordingly, causes element segregation severe exacerbation slab quality in process of setting；Roll-force through-thickness infiltration difficulty in the operation of rolling, heart portion deformation deficiency；After special heavy plate rolling, cooling difficulty and steel plate thickness heat transfer are uneven.Special heavy plate performance is all adversely affected by factors above, therefore promotes special heavy plate performance and has important practical significance.
At present, produce 460MPa rank slab, the microalloy elements such as adding Nb, Ti, V that use in composition design more, utilize the strengthening of Nb, Ti, V Carbonitride Precipitation and precipitation strength effect to improve its mechanical property.Being limited by and roll rear ability, phase transformation strengthening is not enough to the contribution of performance.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of 460MPa rank special heavy plate of good performance；Present invention also offers the production method of a kind of 460MPa rank special heavy plate.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the mass fraction of its chemical composition is: C 0.14～0.17%, Mn 1.40～1.80%, Si 0.15～0.25%, Al 0.20～0.40%, S≤0.01%, P≤0.02%, V >=0.020%, Ti >=0.010%, Nb >=0.020%, remaining is Fe and trace impurity.
In chemical composition of the present invention, V 0.020～0.040%, Ti 0.010～0.025%, Nb 0.020～0.040%.The thickness specification of described special heavy plate is 60～100mm.
The inventive method includes heating rolling, ultrafast cold and thermal straightening operation；Described special heavy plate chemical composition is described above.
Ultrafast cooling working procedure described in the inventive method: steel plate through ultrafast cold but after, surface red temperature is 580～620 DEG C.
Heating rolling operation described in the inventive method: heating-up temperature 1050～1150 DEG C, treats temperature thickness >=140mm；Heating carries out roughing and finish rolling after temperature, and secondary start rolling temperature≤860 DEG C of finish rolling, the finishing temperature of finish rolling is 780～810 DEG C.
Thermal straightening operation described in the inventive method uses the straightening force of 8000kN～10000kN.
Ultrafast cooling working procedure front spring described in the inventive method carries out preheating and rectifys.
The present invention and method thereof use C-Mn-Nb-V-Ti component system to combine ultrafast cold production 60～100mm thickness specification 460MPa rank special heavy plate, by Nb, Ti, V carbonitride cooling procedure precipitation strength and precipitation strength effect, fining austenite grains improves the mechanical performance of steel plate；In conjunction with ultrafast cold quick cooling characteristics after rolling, effectively reduce cool time, inhibiting grain growth；Ultrafast cold under conditions of cooling rate increase, bainite and acicular ferrite phase transformation be obviously enhanced contribute to steel plate object performance improve.
Use produced by technique scheme and have the beneficial effects that: the present invention and method thereof use C-Mn-Nb-V-Ti component system to combine ultrafast cold can produce 60～100mm thickness specification 460MPa rank special heavy plates, can effectively reduce Nb, Ti, V microalloy element consumption, content is accelerated refrigerating mode condition V 0.050～0.100%, Ti 0.015～0.030%, Nb 0.038～0.045% by routine can be reduced to V 0.020～0.040%, Ti 0.010～0.025%, Nb 0.020～0.040%, significantly reduces production cost.
After the inventive method uses the design combination of C-Mn-Nb-V-Ti composition to roll, ultrafast refrigeration technique effectively reduces cost；For ensureing that template uses ultrafast cold front pre-thermal straightening, ensure template through ultrafast cold dynamic control cooling parameter, follow-up employing 8000kN～10000kN straightening force.Therefore, the inventive method has the features such as low cost, process stabilizing, template and excellent performance.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation, and the performance detection in following embodiment uses through thickness cross directional stretch.
Embodiment 1: this 460MPa rank special heavy plate and production method thereof are as described below.
The weight/mass percentage composition of this special heavy plate chemical composition is: C 0.14%, Mn 1.40%, Si
0.24%, Al 0.40%, V 0.020%, Ti 0.023%, Nb 0.020%, S 0.01%, P
0.017%, remaining is Fe and trace impurity；Thickness is 60mm.
The production method of this special heavy plate includes heating rolling, ultrafast cold and thermal straightening operation, is specially and uses following process successively: converter smelting, LF refine, continuous casting, heating furnace, high pressure dephosphorization, roughing mill, intermediate blank cooling, finishing mill, pre-thermal straightening machine, ultrafast cold and thermal straightening machine.Described ultrafast cold automatically adjust the cooling parameter such as cooling water inflow, upper and lower collector pipe water ratio and roller table speed based on backstage, determine hit red temperature and template.
Technological parameter: heating-up temperature 1076 DEG C, treats temperature thickness 140mm, the secondary start rolling temperature of finish rolling 851 DEG C, finishing temperature 796 DEG C；After steel plate excess of export rapid cooling chiller, surface of steel plate red temperature 616 DEG C；Use the straightening force of 9000kN.
This special heavy plate is through inspection, and tensile strength is 472MPa, yield strength 608MPa, 0 DEG C of ballistic work 165J.
Embodiment 2: this 460MPa rank special heavy plate and production method thereof are as described below.
The weight/mass percentage composition of this special heavy plate chemical composition is: C 0.16%, Mn 1.61%, Si
0.22%, Al 0.22%, V 0.031%, Ti 0.019%, Nb 0.029%, S 0.007%, P
0.017%, remaining is Fe and trace impurity；Thickness is 70mm.
The operation of this special heavy plate production method and step are with embodiment 1；Concrete technology parameter is: heating-up temperature 1085 DEG C, treats temperature thickness 140mm, the secondary start rolling temperature of finish rolling 843 DEG C, finishing temperature 802 DEG C；After steel plate excess of export rapid cooling chiller, surface of steel plate red temperature 607 DEG C；Use the straightening force of 8000kN.
This special heavy plate is through inspection, and tensile strength is 481MPa, yield strength 602MPa, 0 DEG C of ballistic work 153J.
Embodiment 3: this 460MPa rank special heavy plate and production method thereof are as described below.
The weight/mass percentage composition of this special heavy plate chemical composition is: C 0.15%, Mn 1.56%, Si
0.19%, Al 0.26%, V 0.026%, Ti 0.022%, Nb 0.031%, S 0.006%, P
0.018%, remaining is Fe and trace impurity；Thickness is 80mm.
The operation of this special heavy plate production method and step are with embodiment 1；Concrete technology parameter is: heating-up temperature 1150 DEG C, treats temperature thickness 150mm, the secondary start rolling temperature of finish rolling 855 DEG C, finishing temperature 780 DEG C；After steel plate excess of export rapid cooling chiller, surface of steel plate red temperature 620 DEG C；Use the straightening force of 8500kN.
This special heavy plate is through inspection, and tensile strength is 475MPa, yield strength 593MPa, 0 DEG C of ballistic work 131J.
Embodiment 4: this 460MPa rank special heavy plate and production method thereof are as described below.
The weight/mass percentage composition of this special heavy plate chemical composition is: C 0.17%, Mn 1.74%, Si
0.25%, Al 0.25%, V 0.040%, Ti 0.010%, Nb 0.040%, S 0.006%, P
0.015%, remaining is Fe and trace impurity；Thickness is 90mm.
The operation of this special heavy plate production method and step are with embodiment 1；Concrete technology parameter is: heating-up temperature 1073 DEG C, treats temperature thickness 160mm, the secondary start rolling temperature of finish rolling 857 DEG C, finishing temperature 810 DEG C；After steel plate excess of export rapid cooling chiller, surface of steel plate red temperature 583 DEG C；Use the straightening force of 9500kN.
This special heavy plate is through inspection, and tensile strength is 471MPa, yield strength 611MPa, 0 DEG C of ballistic work 113J.
Embodiment 5: this 460MPa rank special heavy plate and production method thereof are as described below.
The weight/mass percentage composition of this special heavy plate chemical composition is: C 0.16%, Mn 1.80%, Si
0.15%, Al 0.20%, V 0.037%, Ti 0.025%, Nb 0.037%, S 0.005%, P
0.02%, remaining is Fe and trace impurity；Thickness is 100mm.
The operation of this special heavy plate production method and step are with embodiment 1；Concrete technology parameter is: heating-up temperature 1050 DEG C, treats temperature thickness 160mm, the secondary start rolling temperature of finish rolling 860 DEG C, finishing temperature 803 DEG C；After steel plate excess of export rapid cooling chiller, surface of steel plate red temperature 580 DEG C；Use the straightening force of 10000kN.
This special heavy plate is through inspection, and tensile strength is 467MPa, yield strength 606MPa, 0 DEG C of ballistic work 105J.
Claims (9)
1. a 460MPa rank special heavy plate, it is characterised in that the mass fraction of its chemical composition is: C 0.14～0.17%, Mn 1.40～1.80%, Si 0.15～0.25%, Al
0.20～0.40%, S≤0.01%, P≤0.02%, V >=0.020%, Ti >=0.010%, Nb >=0.020%, remaining is Fe and trace impurity.
A kind of 460MPa rank special heavy plate the most according to claim 1, it is characterised in that: in described chemical composition, V 0.020～0.040%, Ti
0.010～0.025%, Nb 0.020～0.040%.
A kind of 460MPa rank special heavy plate the most according to claim 1 and 2, it is characterised in that: the thickness specification of described special heavy plate is 60～100mm.
4. the production method of a 460MPa rank special heavy plate, it is characterised in that: it includes heating rolling, ultrafast cold and thermal straightening operation；The mass fraction of described special heavy plate chemical composition is: C 0.14～0.17%, Mn 1.40～1.80%, Si 0.15～0.25%, Al
0.20～0.40%, S≤0.01%, P≤0.02%, V >=0.020%, Ti >=0.010%, Nb >=0.020%, remaining is Fe and trace impurity.
The production method of a kind of 460MPa rank special heavy plate the most according to claim 4, it is characterised in that described ultrafast cooling working procedure: steel plate through ultrafast cold but after, surface red temperature is 580～620 DEG C.
The production method of a kind of 460MPa rank special heavy plate the most according to claim 4, it is characterised in that described heating rolling operation: heating-up temperature 1050～1150 DEG C, treats temperature thickness >=140mm；Heating carries out roughing and finish rolling after temperature, and secondary start rolling temperature≤860 DEG C of finish rolling, the finishing temperature of finish rolling is 780～810 DEG C.
7. according to the production method of a kind of 460MPa rank special heavy plate described in claim 4,5 or 6, it is characterised in that described thermal straightening operation uses the straightening force of 8000kN～10000kN.
8. according to the production method of a kind of 460MPa rank special heavy plate described in claim 4,5 or 6, it is characterised in that: described ultrafast cooling working procedure front spring carries out preheating and rectifys.
The production method of a kind of 460MPa rank special heavy plate the most according to claim 7, it is characterised in that: described ultrafast cooling working procedure front spring carries out preheating and rectifys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610575680.9A CN106011647A (en) | 2016-07-21 | 2016-07-21 | 460MPa-level extra-thick plate and production method thereof |
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| CN201610575680.9A CN106011647A (en) | 2016-07-21 | 2016-07-21 | 460MPa-level extra-thick plate and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012395A (en) * | 2017-03-02 | 2017-08-04 | 唐山钢铁集团有限责任公司 | A kind of method that rough rolling step improves low-alloy special heavy plate center portion quality |
| CN114160580A (en) * | 2021-11-22 | 2022-03-11 | 南京钢铁股份有限公司 | Cooling method for improving flatness of weathering steel A709Gr50 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138449A (en) * | 2008-12-11 | 2010-06-24 | Jfe Steel Corp | Precipitation strengthening type dual phase hot rolled steel sheet |
| CN102345057A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength and toughness Q460E structural steel thick plate and production method thereof |
| CN103160734A (en) * | 2013-03-16 | 2013-06-19 | 南阳汉冶特钢有限公司 | Super-thick steel P460NL1 (L2) plate for pressure vessel and method for producing same |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN105177421A (en) * | 2015-10-08 | 2015-12-23 | 山东钢铁股份有限公司 | Special steel plate with yield strength being 500 MPa and for forklift cross beam and preparation method of steel plate |
-
2016
- 2016-07-21 CN CN201610575680.9A patent/CN106011647A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138449A (en) * | 2008-12-11 | 2010-06-24 | Jfe Steel Corp | Precipitation strengthening type dual phase hot rolled steel sheet |
| CN102345057A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength and toughness Q460E structural steel thick plate and production method thereof |
| CN103160734A (en) * | 2013-03-16 | 2013-06-19 | 南阳汉冶特钢有限公司 | Super-thick steel P460NL1 (L2) plate for pressure vessel and method for producing same |
| CN103572023A (en) * | 2013-10-24 | 2014-02-12 | 南京钢铁股份有限公司 | Method for producing ultra-fine grains on surface layer of thick/ultra-thick low-alloy steel plate |
| CN105177421A (en) * | 2015-10-08 | 2015-12-23 | 山东钢铁股份有限公司 | Special steel plate with yield strength being 500 MPa and for forklift cross beam and preparation method of steel plate |
Non-Patent Citations (3)
| Title |
|---|
| 崔占全 等: "《晶体缺陷与固态相变》", 30 April 2014 * |
| 朱志强 等: "《钢分析化学与物理检测》", 30 June 2013 * |
| 王廷溥 等: "《现代轧钢学》", 31 August 2014 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012395A (en) * | 2017-03-02 | 2017-08-04 | 唐山钢铁集团有限责任公司 | A kind of method that rough rolling step improves low-alloy special heavy plate center portion quality |
| CN107012395B (en) * | 2017-03-02 | 2018-06-19 | 唐山钢铁集团有限责任公司 | A kind of method that rough rolling step improves low-alloy special heavy plate center portion quality |
| CN114160580A (en) * | 2021-11-22 | 2022-03-11 | 南京钢铁股份有限公司 | Cooling method for improving flatness of weathering steel A709Gr50 |
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