CN101928879A - High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof - Google Patents
High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof Download PDFInfo
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- CN101928879A CN101928879A CN2009100122224A CN200910012222A CN101928879A CN 101928879 A CN101928879 A CN 101928879A CN 2009100122224 A CN2009100122224 A CN 2009100122224A CN 200910012222 A CN200910012222 A CN 200910012222A CN 101928879 A CN101928879 A CN 101928879A
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Abstract
The invention provides a high-strength cold-roll phase-change plastic steel plate with good plasticity and a preparation method thereof. The plastic steel plate comprises the following chemical components: 0.05-0.3% of C, 0.1-0.6% of Si, 0.5-2.0% of Mn, 0.04-0.1% of P, 0.06-0.2% of RE, 0.01-0.03% of N, two or more than two of 0.01-0.5% of V, 0.01-0.5% of Ti and 0.01-0.5% of Nb and the balance of Fe and inevitable impurities. The preparation method comprises the following steps of: (1) smelting and casting blanks; (2) rolling: heating to 1100-1250 DEG C, maintaining the temperature for 2-4 h, starting rolling at 1100 DEG C, finishing rolling at 760-900 DEG C and coiling at 560-700 DEG C, wherein the accumulated rolling reduction for cold rolling is 40-80%; and (3) thermal treatment: isothermally treating at 710-850 DEG C for 0.5-6 min, quickly cooling to 330-500 DEG C with the rate of 10-50 DEG C/s, isothermally treating for 0.5-20 min and cooling to room temperature with the rate of 5-20 DEG C/s. The steel plate also has good weldability, thermal immersion plating property and surface quality.
Description
Technical field
The invention belongs to the metallurgical products technical field, relate in particular to a kind of high strength cold-rolled phase transformation plasticity steel and preparation method thereof.
Background technology
Because the energy and environmental problem have caused that car industry alleviates the change of car weight, people begin to substitute mild steel with high-strength steel (HSS), and this substituting can effectively be reduced car weight and oil consumption, and do not reduce safe reliability.In these high-strength steel, obtained the extensive concern of each big steel enterprise, motor corporation with its unique highly malleablized mechanism with phase change induction plasticity steel (TRIP steel).The preparation principle of cold rolling TRIP steel is: by design of alloy and technology controlling and process, prepare the complex phase steel that contains ferrite, bainite and residual austenite tissue, undergo phase transition intensity and the toughness that improves steel by residual austenite in deformation process.
All contain higher silicon or aluminium content in traditional low-carbon (LC) TRIP composition of steel, for the plasticity and accumulation value that makes steel greater than 20000MPa%, generally to contain silicone content in the TRIP steel greater than 1% (weight percent).The existence of these silicon, changed the activity of carbon in austenite on the one hand, cause soft steel can obtain a certain amount of more stable residual austenite in room temperature, martensitic transformation takes place in these residual austenites in strain path, causes steel to have high intensity and plasticity; On the other hand, the silicon solid solution further improves the intensity of steel in ferrite.But higher silicone content causes plate surface quality to descend, and hot-rolled steel plate performance and surface-coated performance are descended greatly.
Merely reduce silicone content, low carbon low silicon TRIP steel can't obtain high intensity and plasticity, by adding some substitute element, as elements such as aluminium, phosphorus, can improve the strength and ductility product of low carbon low silicon TRIP steel.But the intensity of the low silicon TRIP steel of aluminiferous low-carbon is lower, other poor-performings of phosphorous TRIP steel, their all difficult performances that reaches traditional TRIP steel.When critical annealing, the austenite content that contains in the TRIP steel of Al is low, and bainite content is few and the phase transformation process is slow during isothermal, and Al increases stacking fault energy simultaneously, suppresses martensite γ-ε phase transformation.
The preparation method of relevant cold rolling TRIP steel in the prior art, as application number is 01124921.8, the Chinese patent and the application number of " high tensile steel plate and manufacture method thereof that processibility and coating adaptation are good " by name are 200480002242.9, the Chinese patent of " high-strength hot-dip galvanized steel sheet and preparation method thereof " by name, by adding the formation that an amount of Al and N control iron-nitride, obtained the surface of good coating respectively.But the raising of Al and N content can worsen slab surface quality.
Summary of the invention
The objective of the invention is to overcome the above-mentioned various defectives of existing in prior technology, on the basis of low silicon no-aluminum composition by compound interpolation vanadium, titanium and niobium, in conjunction with corresponding thermal treatment process, a kind of have more high strength and good plasticity are provided, also have phase transformation plasticity steel of good weldability, hot-dip and surface quality and preparation method thereof simultaneously, the strength grade of this steel grade is between 900MPa～1580MPa.
The present invention is achieved in that this chemical constitution with high strength cold-rolled transformation plasticity steel plate of good plasticity is by weight percentage: C:0.05%～0.3%, Si:0.1%～0.6%, Mn:0.5%～2.0%, P:0.02%～0.1%, RE:0.06%～0.2%, N:0.01%～0.03%, also contain V:0.01%～0.5%, Ti:0.01%～0.5%, in Nb:0.01%～0.5% two or more, surplus are Fe and unavoidable impurities.
Cold rolled phase transformation plasticity steel of the present invention is made up of ferrite, residual austenite and bainite, and wherein, ferrite content is 40%～80%, and residual austenite is 5%～20%, and all the other are bainite, more than are volume percent.
The present invention by compound interpolation niobium, vanadium and titanium, utilizes the useful effect of adding element, and adopts corresponding heat treatment technics on the basis of low silicon no-aluminum composition, just can obtain the low carbon low silicon TRIP steel of tensile strength between 900MPa～1480MPa.Wherein, the vanadium of adding, a part is solid-solubilized in the austenite, helps to increase remained austenite content, and another part is present in the ferrite with the form of carbide, improves the intensity of steel; The niobium that adds, a part of solid solution improve the intensity of steel in ferrite, another part is separated out with the form of carbonitride, improve the intensity of steel; The titanium that adds, mainly the form with titanium carbonitride exists, and plays the effect of crystal grain thinning, thereby improves the intensity of steel, improves the welding property of steel simultaneously.
The preparation method that the present invention has the high strength cold-rolled transformation plasticity steel plate of good plasticity comprises following processing step: (1) smelts, strand; (2) rolling: the hot rolling Heating temperature: 1100～1250 ℃, soaking time is 2～4h, and start rolling temperature is 1100 ℃, 760～900 ℃ of finishing temperatures, 560～700 ℃ of coiling temperatures; Hot-rolled sheet thickness is 2～4mm; Cold rolling accumulation draught 40%～80%; (3) thermal treatment: 710～850 ℃ of isothermals keep after 0.5～6 minute being quickly cooled to 330～500 ℃ and isothermal 0.5～20 minute with 10～50 ℃/s speed, again with 5～20 ℃/s speed air cooling or oil cooling to room temperature, promptly obtain having the high strength cold-rolled transformation plasticity steel plate of good plasticity.
Described slab thickness 〉=the 135mm of the high strength cold-rolled transformation plasticity steel plate of the present invention preparation method, described finished product thickness 0.5～2.0mm after cold rolling.
Beneficial effect of the present invention: owing to adopt special composition design and thermal treatment process, the present invention makes low carbon low silicon (≤0.6%) the TRIP steel that does not contain Al have higher intensity and good plasticity (tensile strength is broken unit elongation and reached more than 15%) between 900～1480MPa.Simultaneously, the present invention also has good weldability, hot-dip and surface quality.Because the interpolation of elements such as the content of control C and Si and Nb, Ti, V, can improve the welding property of steel plate.Owing to take low Si design, solved the shortcoming of the surface of steel plate immersion plating difference that the oxidation of Si causes.Owing to adopt no Al design, improved the surface quality of continuously cast bloom, also reduced shortcomings such as continous casting sprue obstruction simultaneously.
The present invention is further described by the following embodiment.
Embodiment
The embodiment of the invention is used preparation technology with high strength cold-rolled transformation plasticity steel plate of good plasticity comprise: the sheet billet continuous casting of converter smelting, the refining of LF stove, 135mm or above thickness, 1000～1250 ℃ of hot rollings, its finishing temperatures are 760～900 ℃, coiling temperature is 560～700 ℃, carry out cold rollingly again with 40%～80% accumulation draught, make the steel plate that thickness is 0.5～2.0mm.Heat-treat again: with cold rolling back steel plate 710～850 ℃ of isothermals 1～6 minute, be quickly cooled to 330～500 ℃ and isothermal 5～20 minutes with 10～50 ℃/s speed subsequently, be cooled to room temperature with 5～20 ℃/s speed sky at last, can obtain having the high strength cold-rolled transformation plasticity steel plate of good plasticity.The steel grades of the embodiment of the invention sees Table 1, and annealing schedule sees Table 2, and mechanical property and coating property see Table 3.The welding of embodiment of the invention finished product steel plate and hot dip process performance all satisfy the mechanical property of corresponding grade of steel, its processibility and coating adaptation are good, hot dip process sample surfaces quality reaches the FB rank, and the flexual center diameter that adherence of coating can be tested is a, and the platability evaluation sees Table 3.
The composition (weight %) of table 1 embodiment of the invention steel
Table 2 embodiment of the invention steel plate heat treatment process
Mechanical property and surperficial zinc coating performance evaluation after the thermal treatment of table 3 embodiment of the invention steel plate
Annotate: zero expression does not have not plating part.
Claims (4)
1. high strength cold-rolled transformation plasticity steel plate with good plasticity, the chemical constitution that it is characterized in that this steel plate is by weight percentage: C:0.05%～0.3%, Si:0.1%～0.6%, Mn:0.5%～2.0%, P:0.04%～0.1%, RE:0.06%～0.2%, N:0.01%～0.03%, also contain V:0.01%～0.5%, Ti:0.01%～0.5%, in Nb:0.01%～0.5% two or more, surplus are Fe and unavoidable impurities.
2. high strength cold-rolled transformation plasticity steel plate according to claim 1 is characterized in that this steel is made up of ferrite, residual austenite and bainite, wherein, ferrite content is 40%～80%, residual austenite is 5%～20%, and all the other are bainite, more than are volume percent.
3. the preparation method of claim 1 or 2 described high strength cold-rolled transformation plasticity steel plates, it is characterized in that comprising following processing step: (1) smelts, strand; (2) rolling: the hot rolling Heating temperature: 1100～1250 ℃, soaking time is 2～4h, and start rolling temperature is 1100 ℃, 760～900 ℃ of finishing temperatures, 560～700 ℃ of coiling temperatures; Hot-rolled sheet thickness is 2～4mm; Cold rolling accumulation draught 40%～80%; (3) thermal treatment: 710～850 ℃ of isothermals keep after 0.5～6 minute being quickly cooled to 330～500 ℃ and isothermal 3～20 minutes with 10～50 ℃/s speed, are cooled to room temperature with＞20 ℃/s speed again.
4. the preparation method of high strength cold-rolled transformation plasticity steel plate according to claim 3 is characterized in that described slab thickness 〉=135mm, described cold rolling back finished product thickness 0.5～2.0mm.
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| CN2009100122224A CN101928879A (en) | 2009-06-22 | 2009-06-22 | High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof |
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| CN2009100122224A CN101928879A (en) | 2009-06-22 | 2009-06-22 | High-strength cold-roll phase-change plastic steel plate with good plasticity and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732788A (en) * | 2012-03-26 | 2012-10-17 | 镇江耐丝新型材料有限公司 | Novel microalloyed steel for high speed spiral cutting steel wires |
| CN103898404A (en) * | 2014-04-28 | 2014-07-02 | 莱芜钢铁集团有限公司 | Vanadium-microalloyed hot-rolled transformation induced plasticity steel and preparation method |
| CN106011644A (en) * | 2016-07-11 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | High-elongation and high-strength cold-rolled steel plate and preparation method thereof |
| CN107815608A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds Steel Bar and its LF stove production methods |
| CN107955916A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds steel wire rod and its LF stove production methods |
| CN107964630A (en) * | 2017-11-30 | 2018-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds steel bar and its production method |
| CN109680211A (en) * | 2018-12-28 | 2019-04-26 | 首钢集团有限公司 | A kind of manufacturing method of vehicle structure steel and its manufacturing method and automobile structure |
| CN111534739A (en) * | 2020-02-17 | 2020-08-14 | 本钢板材股份有限公司 | 980 MPa-grade high-formability cold-rolled phase-change induced plasticity steel and preparation method thereof |
| CN111621707A (en) * | 2020-06-28 | 2020-09-04 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN115341130A (en) * | 2022-09-06 | 2022-11-15 | 广西科技大学 | Method for preparing high-strength-ductility hot-rolled cold-formed automobile structural steel |
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2009
- 2009-06-22 CN CN2009100122224A patent/CN101928879A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732788A (en) * | 2012-03-26 | 2012-10-17 | 镇江耐丝新型材料有限公司 | Novel microalloyed steel for high speed spiral cutting steel wires |
| CN103898404A (en) * | 2014-04-28 | 2014-07-02 | 莱芜钢铁集团有限公司 | Vanadium-microalloyed hot-rolled transformation induced plasticity steel and preparation method |
| CN103898404B (en) * | 2014-04-28 | 2015-12-09 | 莱芜钢铁集团有限公司 | A kind of vanadium micro-alloying hot-rolled transformation induction plasticity steel and preparation method |
| CN106011644A (en) * | 2016-07-11 | 2016-10-12 | 攀钢集团攀枝花钢铁研究院有限公司 | High-elongation and high-strength cold-rolled steel plate and preparation method thereof |
| CN107815608A (en) * | 2017-11-30 | 2018-03-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds Steel Bar and its LF stove production methods |
| CN107955916A (en) * | 2017-11-30 | 2018-04-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds steel wire rod and its LF stove production methods |
| CN107964630A (en) * | 2017-11-30 | 2018-04-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Microalloy containing Ti builds steel bar and its production method |
| CN109680211A (en) * | 2018-12-28 | 2019-04-26 | 首钢集团有限公司 | A kind of manufacturing method of vehicle structure steel and its manufacturing method and automobile structure |
| CN111534739A (en) * | 2020-02-17 | 2020-08-14 | 本钢板材股份有限公司 | 980 MPa-grade high-formability cold-rolled phase-change induced plasticity steel and preparation method thereof |
| CN111621707A (en) * | 2020-06-28 | 2020-09-04 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN111621707B (en) * | 2020-06-28 | 2022-02-08 | 马鞍山钢铁股份有限公司 | Steel for high-ductility cold-rolled steel bar CRB680H and production process thereof |
| CN115341130A (en) * | 2022-09-06 | 2022-11-15 | 广西科技大学 | Method for preparing high-strength-ductility hot-rolled cold-formed automobile structural steel |
| CN115341130B (en) * | 2022-09-06 | 2023-08-11 | 广西科技大学 | Method for preparing high-strength plastic product hot-rolled cold-formed automobile structural steel |
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Application publication date: 20101229 |