CN1995430A - Method for improving steel plate low temperature tenacity and strain ageing low temperature tenacity - Google Patents
Method for improving steel plate low temperature tenacity and strain ageing low temperature tenacity Download PDFInfo
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- CN1995430A CN1995430A CN 200610124380 CN200610124380A CN1995430A CN 1995430 A CN1995430 A CN 1995430A CN 200610124380 CN200610124380 CN 200610124380 CN 200610124380 A CN200610124380 A CN 200610124380A CN 1995430 A CN1995430 A CN 1995430A
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Abstract
The invention discloses a modifying method of low-temperature flexibility and strain ageing effect of steel board, which comprises the following steps: making steel; refining through adding low-carbon ferric alloy; injecting crystallizer from inlet on the bottom; casting; rolling in one-path or two-path; cooling at 5-30deg. c/S within 450-740 deg. c.
Description
[technical field]
The present invention relates to a kind of smelting iron and steel technology, especially relate to a kind of improvement and contain the low-temperature flexibility of residual element steel plate and the method for strain ageing low temperature tenacity.
[background technology]
In steelmaking process, steelmaking feeds such as molten iron, steel scrap and iron alloy can be brought a large amount of impurity elements in the steel melting furnace into, in steel smelting procedure, part impurity such as p and s can be removed, but still some impurity such as Cu, As, Sn, Sb etc. with final residue in steel, traditionally, this part impurity element that remains in the steel is referred to as residual element, the existence of above-mentioned residual element produces harmful effect to steel performance especially low-temperature flexibility and strain ageing low temperature tenacity in the steel, causes the anti-low-temperature flexibility and the strain ageing low temperature tenacity of steel defective.
[summary of the invention]
In order to overcome the above-mentioned shortcoming of prior art, the invention provides the intensity that the satisfied temperature requirement below-40 ℃ of a kind of low-temperature flexibility performance that adopts the design of low-carbon (LC) and microalloy composition to combine, make hot-rolled steel sheet with cooling controlling and rolling controlling process, strain ageing low temperature tenacity can reach temperature requirement below-20 ℃ and steel plate and satisfy corresponding breed standard requirement, contain the low-temperature flexibility of residual element steel plate and the method for strain ageing low temperature tenacity with improvement.
The technical solution adopted for the present invention to solve the technical problems is: a kind of low-temperature flexibility of steel plate and method of strain ageing low temperature tenacity improved, comprise steel-making and refining, continuous casting, rolling and process for cooling, described steel-making and refining are to select for use conventional steel-making to refine with electric furnace or converter, the weight percent content of carbon is not more than 0.10% in the control tapping, and at the alloying process of steel, in the molten steel that steel melting furnace comes out, add low carbon ferroalloy and carry out refining, the weight percent content of the impurity component in the molten steel after refining finishes is controlled at: C≤0.10%, P≤0.025%, S≤0.010%, residual element As+Sn+Sb≤0.30%, simultaneously, by adding iron alloy or other metal, add micro alloying element;
Described continuous casting is that molten steel after refining is injected tundish by the mouth of a river of ladle bottom, injects crystallizer by the mouth of a river of tundish bottom, becomes slab by the crystallizer continuous casting, and the slab thickness that goes out crystallizer is 150-300mm;
Described rolling be to adopt a rolling process or two rolling process technologies, for a rolling process controlled rolling process, controlling its rolling process end temp is 950 ℃-1100 ℃; For two rolling process controlled rolling process, controlling the 1st rolling process end temp is 950 ℃-1100 ℃, 850 ℃-950 ℃ of the 2nd rolling process start rolling temperatures, and open rolling thickness is 1.5-3 times of Finished Steel plate thickness, 750 ℃-930 ℃ of finishing temperatures, the 2nd rolling process accumulative total draft 33%-67%;
Described process for cooling is the steel plate after rolling to be controlled cold, and speed of cooling is 5-30 ℃/S, and final cooling temperature is controlled at 450 ℃ of-740 ℃ of scopes.
Described low carbon ferroalloy comprises low carbon ferromanganese, low-carbon ferrosilicon, low-carbon (LC) ferro-silico-manganese.
Described iron alloy comprises ferro-niobium, vanadium iron and ferrotianium, and described other metal comprises aluminium.
Described micro alloying element comprises a kind of in vanadium, niobium, titanium and the aluminium or several, and its weight percent is controlled at V≤0.20%, Nb≤0.10%, Ti≤0.05%, Al≤0.05%.
The invention has the beneficial effects as follows: because residual element mainly are the fragility that increases steel, C and residual element stack have significantly increased the low temperature brittleness of steel, by the C content in the technological process reduction steel, thereby reduce the low temperature brittleness of steel effectively; By steel-making, refinery practice, effectively control and reduce P, S content, can reduce the low temperature brittleness of steel; An amount of vanadium, niobium, titanium, the aluminium of adding in the tapping process, C, N in these trace elements and the steel are combined into stable compound, free nitrogen in reduction even the elimination steel, the strain aging sensitivity of reduction steel, the compound of separating out improves intensity and crystal grain thinning; Roll the after-acceleration cooling, for soft steel, reducing austenitic transformation is ferrite and pearlitic transition temperature; For the super low carbon microalloy steel, roll the after-acceleration cooling, can impel austenitic transformation is low-carbon bainite steel/acicular ferrite steel, thereby reaches best strength and toughness coupling.The low-temperature flexibility performance of hot-rolled steel sheet satisfies temperature requirement below-40 ℃, strain ageing low temperature tenacity can reach temperature requirement below-20 ℃, and the intensity of steel plate satisfies corresponding breed standard requirement, thereby has realized adopting the steelmaking feed production that contains residual element to possess the purpose of low-temperature flexibility and strain ageing low temperature tenacity steel plate.
[embodiment]
The present invention is further described below in conjunction with embodiment.
A kind of low-temperature flexibility of steel plate and method of strain ageing low temperature tenacity improved; comprise steel-making and refining; continuous casting; rolling and process for cooling; in steel-making and refinery practice; select for use conventional steel-making with electric furnace or converter; the weight percent content of carbon is controlled at 0.10% and reaches following (low-carbon (LC) and Ultra-low carbon) in the tapping; alloying process at steel; add low carbon ferroalloy; as low carbon ferromanganese; low-carbon ferrosilicon; the low-carbon (LC) ferro-silico-manganese, the molten steel that steel melting furnace is come out carries out refining by refining furnace, takes to prevent the technological measure of carburetting in the refining process; impurity component is controlled to be in the molten steel after refining is finished: P≤0.025%; S≤0.010%, residual element As+Sn+Sb≤0.30%, simultaneously; by adding iron alloy; as ferro-niobium; vanadium iron and ferrotianium or add other metal such as the form of aluminum shot or aluminium wire increase micro alloying element and also control its weight percent content, as V≤0.20%; Nb≤0.10%; Ti≤0.05%; Al≤0.05% one kind of or several.
Composition after the refining among the present invention be should give control well, and each Composition Control is as follows:
C≤0.10%:C is solution strengthening element commonly used, when improving intensity, increases the fragility of steel; Because residual element mainly are the fragility that increases steel, C and residual element stack have significantly increased the low temperature brittleness of steel, therefore, by the effective C content in control and the reduction steel of technological process, thereby reduce the low temperature brittleness of steel effectively.
P≤0.025%:P is the solution strengthening element, also increases the low temperature brittleness of steel simultaneously.
S≤0.010%:S too high levels can form sulfide inclusion, increases the low temperature brittleness of steel.
Therefore,, effectively control and reduce P, S content, can reduce the low temperature brittleness of steel by steel-making, refinery practice.
Micro alloying element V≤0.20%, Nb≤0.10%, Ti≤0.05%, Als≤0.05%: the main purpose of adding micro alloying element in the steel, be precipitation strength and refined crystalline strengthening by micro alloying element, remedy the loss of the intensity of the steel that carbon drop brings, thereby keep and improve the intensity of steel; Simultaneously, when N content was higher in the steel, microalloy element can combine with N, formed nitride, and free nitrogen in reduction even the elimination steel prevents that free nitrogen from increasing the low temperature strain-age brittleness of steel.
In continuous casting process, molten steel is injected tundish by the mouth of a river of ladle bottom, inject crystallizer by the mouth of a river of tundish bottom, become slab by the crystallizer continuous casting, the slab thickness that goes out crystallizer is 150-300mm.
Controlled rolling and technology for controlled cooling, controlled rolling process using one rolling process (the austenite recrystallization district is rolling) or two rolling processes (austenite recrystallization district and non-recrystallization district two stage rolling) controlled rolling, and post-rolling control cooling process (rolls the after-acceleration cooling, for soft steel, reducing austenitic transformation is ferrite and pearlitic transition temperature; For the super low carbon microalloy steel, roll the after-acceleration cooling, can impel austenitic transformation is low-carbon bainite steel/acicular ferrite steel), for a rolling process controlled rolling process, control 950 ℃-1000 ℃ of its rolling process end temps; For two rolling process controlled rolling process, control 950 ℃-1100 ℃ of the 1st rolling process end temps, 850 ℃-950 ℃ of the 2nd rolling process start rolling temperatures, open rolling thickness: 1.5-3 times of Finished Steel plate thickness, 750 ℃-930 ℃ of finishing temperatures, the 2nd rolling process accumulative total draft 33%-67%.
Technology for controlled cooling: steel plate cooling control after rolling, speed of cooling are generally 5-30 ℃/S, and final cooling temperature generally is controlled at 450 ℃ of-740 ℃ of scopes.Determining of final cooling temperature for the steel plate of ferrite+pearlitic structure, guarantees that final cooling temperature is more than the starting temperature that bainite structure changes; For low-carbon bainite/acicular ferrite steel plate, guarantee that final cooling temperature is below the starting temperature that bainite structure changes.
Add an amount of vanadium, niobium, titanium, aluminium among the present invention in tapping or the refining process, be in order to utilize these effect of trace elements, be combined into stable compound with C, N in the steel, the one, the strain aging sensitivity of reduction steel, the 2nd, the compound of separating out improves intensity and crystal grain thinning; Cooperate the microalloy precipitate to the transformation temperature of steel, the change effect of recrystallization temperature, and cooling controlling and rolling controlling process is pricked cooling control technology, crystal grain thinning to the effect of the precipitation process of precipitate by control, obtain best precipitated phase, realize best strength and toughness coupling.
Embodiment 1
The present invention adopts low-carbon (LC) to add the vanadium micro-alloying composition design production regular tenacity deck of boat that combines with cooling controlling and rolling controlling process, may further comprise the steps successively:
(1) steel-making
It is that 120 tons oxygen top and bottom combined blown converter is smelted that the deck of boat is selected capacity for use, the weight percentage of tapping carbon is 0.03-0.06%, the converter tapping process adds vanadium iron (containing vanadium 50%) 60Kg/ stove, making the weight percentage of vanadium in steel is 0.020-0.030%, tapping process adds the silicomanganese of low-carbon (LC), under the prerequisite of carburetting hardly, realize the control of silicon, manganese content in the steel; The molten steel that steel melting furnace comes out carries out refining in refining furnace, use aluminum shot to make white slag, departures fast and feed aluminum steel and silicon-calcium wire, the above technology of soft blow argon 8min, makes in the steel sour molten aluminium meet the requirements of content, purify hot metal simultaneously.Molten steel composition is as shown in table 1.
(2) continuous casting: molten steel injects tundish by the mouth of a river of ladle bottom, and the tundish liquid steel temperature is 1530-1550 ℃, and by submerged nozzle, molten steel enters crystallizer, and the strand pulling rate is 1.10-1.40m/min, and the slab thickness that goes out crystallizer is 150mm.
(3) strand heating: enter process furnace behind the cooling of above-mentioned strand process secondary, bending straightening, the flame cutting, the strand tapping temperature is 1150 ℃.
(4) hot rolling: the strand that goes out process furnace passes through and enters four roller reversible plate mills after scale on surface is removed in de-scaling, rolling 36mm specification, adopt two rolling process controlled rolling process, rolling 9 roads, temperature thickness 68mm is treated in finish rolling, 880 ℃ of finish rolling start rolling temperatures, finish rolling accumulative total draft 47%, 860 ℃ of finishing temperatures.
(5) cooling: the steel plate after rolling cools off through laminar cooling system, and temperature is 830 ℃ before the cooling, and cooling rate is 5-10 ℃/S, and cooling back temperature is 730 ℃.
The mechanical property of the hot-rolled steel sheet that present embodiment is produced is as shown in table 2, and as shown in Table 2, the mechanical property of this steel plate satisfies the works approval requirement of various countries surveying society to the deck of boat fully.
The chemical ingredients of the hot-rolled steel sheet that table 1 embodiment 1 produces
| Chemical ingredients, % | |||||||||||
| C | Si | Mn | P | S | Cu | As | Cr | Ni | Als | V | Sn |
| 0.084 | 0.267 | 0.805 | 0.019 | 0.003 | 0.096 | 0.082 | 0.016 | 0.006 | 0.028 | 0.025 | 0.055 |
The mechanical property of the hot-rolled steel sheet that table 2 embodiment 1 produces
| ReL，MPa | Rm，MPa | A，％ | -40 ℃ of V-types are impacted J | -20 ℃ of strain aging V-types are impacted J |
| 320 | 440 | 35.5 | 96 | 192 |
Embodiment 2
The present invention adopts low-carbon (LC) and the design of Nb-microalloying composition to combine with cooling controlling and rolling controlling process and produces the D36 level deck of boat, steel plate thickness after rolling is 36mm, its chemical ingredients is as shown in table 3, its mechanical property is as shown in table 4, by table 4 as seen, the mechanical property of this steel plate satisfies the works approval requirement of various countries surveying society to the D36 level deck of boat fully.
The chemical ingredients of the hot-rolled steel sheet that table 3 embodiment 2 produces
| Chemical ingredients, % | |||||||||||
| C | Si | Mn | P | S | Cu | As | Cr | Ni | Als | Nb | Sn |
| 0.100 | 0.389 | 1.402 | 0.021 | 0.005 | 0.093 | 0.075 | 0.019 | 0.006 | 0.016 | 0.028 | 0.049 |
The mechanical property of the hot-rolled steel sheet that table 4 embodiment 2 produces
| ReL，MPa | Rm，MPa | A，％ | -40 ℃ of V-types are impacted J | -20 ℃ of strain aging V-types are impacted J |
| 435 | 535 | 30 | 126 | 141 |
Embodiment 3
The present invention adopts low-carbon (LC) to add niobium, the titanium micro-alloyed branch design production Q370qE bridge steel plate that combines with cooling controlling and rolling controlling process that changes into, steel plate thickness after rolling is 12mm, its chemical ingredients is as shown in table 5, its mechanical property is as shown in table 6, by table 6 as seen, the mechanical property of this steel plate satisfies the requirement of national standard Q345qE fully.
The chemical ingredients of the hot-rolled steel sheet that table 5 embodiment 3 produces
| Chemical ingredients, % | ||||||||||||
| C | Si | Mn | P | S | Cu | As | Cr | Ni | Sn | Ti | Als | Nb |
| 0.08 | 0.38 | 1.503 | 0.019 | 0.002 | 0.10 | 0.08 | 0.02 | 0.01 | 0.047 | 0.006 | 0.022 | 0.029 |
The mechanical property of the hot-rolled steel sheet that table 6 embodiment 3 produces
| ReL，MPa | Rm，MPa | A，％ | -40 ℃ of V-types are impacted J | -20 ℃ of strain aging V-types are impacted J |
| 460 | 560 | 27.5 | 133 | 107 |
Embodiment 4
The present invention adopts low-carbon (LC) to add niobium, the titanium micro-alloyed branch design production X52 steel plate that combines with cooling controlling and rolling controlling process that changes into, steel plate thickness after rolling is 20mm, its chemical ingredients is as shown in table 7, its mechanical property is as shown in table 8, by table 8 as seen, the mechanical property of this steel plate satisfies user's requirement fully.
The chemical ingredients of the hot-rolled steel sheet that table 7 embodiment 4 produces
| Chemical ingredients, % | ||||||||||||
| C | Si | Mn | P | S | Cu | As | Cr | Ni | Sn | Ti | Als | Nb |
| 0.06 | 0.37 | 1.485 | 0.018 | 0.004 | 0.10 | 0.07 | 0.02 | 0.01 | 0.047 | 0.015 | 0.025 | 0.028 |
The mechanical property of the hot-rolled steel sheet that table 8 embodiment 4 produces
| ReL，MPa | Rm，MPa | A，％ | -40 ℃ of V-types are impacted J | -20 ℃ of strain aging V-types are impacted J |
| 430 | 540 | 31 | 153 | 135 |
Claims (4)
1, a kind of low-temperature flexibility of steel plate and method of strain ageing low temperature tenacity improved comprises steel-making and refining, continuous casting, rolling and process for cooling, it is characterized in that:
Described steel-making and refining are to select for use conventional steel-making to refine with electric furnace or converter, and the weight percent content of carbon is not more than 0.10% in the control tapping; In the alloying process of steel, in the molten steel that steel melting furnace comes out, add low carbon ferroalloy and carry out refining, the weight percent content of the impurity component in the molten steel after refining finishes is controlled at: C≤0.10%, P≤0.025%, S≤0.010%, residual element As+Sn+Sb≤0.30%, simultaneously, by adding iron alloy or other metal, add micro alloying element;
Described continuous casting is that molten steel after refining is injected tundish by the mouth of a river of ladle bottom, injects crystallizer by the mouth of a river of tundish bottom, becomes slab by the crystallizer continuous casting, and the slab thickness that goes out crystallizer is 150-300mm;
Described rolling be to adopt a rolling process or two rolling process technologies, for a rolling process controlled rolling process, controlling its rolling process end temp is 950 ℃-1100 ℃; For two rolling process controlled rolling process, controlling the 1st rolling process end temp is 950 ℃-1100 ℃, 850 ℃-950 ℃ of the 2nd rolling process start rolling temperatures, and open rolling thickness is 1.5-3 times of Finished Steel plate thickness, 750 ℃-930 ℃ of finishing temperatures, the 2nd rolling process accumulative total draft 33%-67%;
Described process for cooling is the steel plate after rolling to be controlled cold, and speed of cooling is 5-30 ℃/S, and final cooling temperature is controlled at 450 ℃ of-740 ℃ of scopes.
2, the low-temperature flexibility of steel plate and the method for strain ageing low temperature tenacity improved as claimed in claim 1, it is characterized in that: described low carbon ferroalloy comprises low carbon ferromanganese, low-carbon ferrosilicon, low-carbon (LC) ferro-silico-manganese.
3, the low-temperature flexibility of steel plate and the method for strain ageing low temperature tenacity improved as claimed in claim 1, it is characterized in that: described iron alloy comprises ferro-niobium, vanadium iron and ferrotianium, described other metal comprises aluminium.
4, the low-temperature flexibility of steel plate and the method for strain ageing low temperature tenacity improved as claimed in claim 1, it is characterized in that: described micro alloying element comprises a kind of in vanadium, niobium, titanium and the aluminium or several, and its weight percent is controlled at V≤0.20%, Nb≤0.10%, Ti≤0.05%, Al≤0.05%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610124380 CN1995430A (en) | 2006-12-25 | 2006-12-25 | Method for improving steel plate low temperature tenacity and strain ageing low temperature tenacity |
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| CN 200610124380 CN1995430A (en) | 2006-12-25 | 2006-12-25 | Method for improving steel plate low temperature tenacity and strain ageing low temperature tenacity |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101352724B (en) * | 2008-09-02 | 2011-03-02 | 首钢总公司 | Method for producing boron-containing non-quenching and tempering plastic mold steel |
| CN102690989A (en) * | 2011-03-22 | 2012-09-26 | 株式会社神户制钢所 | Thick steel board having excellent toughness and strain efficiency |
| CN106636904A (en) * | 2016-12-26 | 2017-05-10 | 南京钢铁股份有限公司 | Production method of low-stress deformed steel plate with -60 DEG C low-temperature impact performance |
| CN111225987A (en) * | 2017-10-11 | 2020-06-02 | 株式会社Posco | Thick steel sheet having excellent low-temperature strain aging impact characteristics and method for producing same |
-
2006
- 2006-12-25 CN CN 200610124380 patent/CN1995430A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101352724B (en) * | 2008-09-02 | 2011-03-02 | 首钢总公司 | Method for producing boron-containing non-quenching and tempering plastic mold steel |
| CN102690989A (en) * | 2011-03-22 | 2012-09-26 | 株式会社神户制钢所 | Thick steel board having excellent toughness and strain efficiency |
| CN106636904A (en) * | 2016-12-26 | 2017-05-10 | 南京钢铁股份有限公司 | Production method of low-stress deformed steel plate with -60 DEG C low-temperature impact performance |
| CN111225987A (en) * | 2017-10-11 | 2020-06-02 | 株式会社Posco | Thick steel sheet having excellent low-temperature strain aging impact characteristics and method for producing same |
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