CN102383059A - Hot rolled transformation induced plasticity (TRIP) steel and preparation method thereof - Google Patents
Hot rolled transformation induced plasticity (TRIP) steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses hot rolled TRIP steel, which belongs to special steel materials used in automobiles and coal and petroleum exploitation. The hot rolled TRIP steel comprises (weight percentage) 0.05 to 0.4% of C, 0.1 to 0.5% of Si, 1 to 2% of Mn, 0.1 to 1.5% of Cr, no more than 1.5% of Ni, no more than 0.06% of Al and no more than 0.01% of N, with the rest being Fe and unavoidable impurities. According to the invention, the above-mentioned components are made into billets which are then subjected to hot rolling and then to heat treatment: the hot rolled billets are kept at a temperature of 950 DEG C for 30 to 60 minutes, then are subjected to salt bath and quenching and are kept at a temperature of 400 to 500 DEG C for 20 to 120 minutes, sheet bending is carried out, obtained coils are subjected to air cooling so as to allow the temperature of the coils to drop to room temperature, and finally the hot rolled TRIP steel with tensile strength of 600 to 900 MPa, elongation percentage of 25% to 35% and strength-ductility balance greater than 18000 MPa% is obtained. The hot rolled TRIP steel provided in the invention has good coating capability, weldability and wear resistance.
Description
Technical field
The present invention relates to a kind of special steel material preparation methods, belong to automobile, coal and oil production Application Areas.Relate in particular to a kind of hot-rolling phase change induction plasticity steel (TRIP) and method of manufacture thereof.
Background technology
Phase change induction plasticity (TRIP:Transformation Induced Plasticity) steel is a new steel grade; Be to the steel highly malleablized with a kind of new thinking; Promptly utilize the residual austenite in the steel under the situation of stressed generation strained, to change martensite into, thereby reach the purpose of reinforcement, the plasticity of material can increase again greatly simultaneously; Having realized the optimization of toughness and tenacity so simultaneously, is that other steel grade is not available.The TRIP steel plate has high ys and tensile strength, and ductility is strong, and the drawing ability is high, compares with traditional steel plate; Alleviate approximately 12% with the pts wt of TRIP steel plate manufacturing, and car weight alleviates 10%, can reduce oil consumption 3% one 7%; The exhaust gas discharging amount also reduces simultaneously, has alleviated the pollution to environment, and the ability of energy absorption is strong simultaneously; Can resist the viscous deformation when clashing into, significantly promote the safe class of automobile, whole economic efficiency obviously improves.The motor-dom that is applied in of this steel plate causes and pays close attention to widely and pay attention to.Because the adjustable extent of TRIP rigidity ability is wider, the TRIP steel of heterogeneity can obtain different highly malleablized combinations through different thermal treatment, to adapt to the different demands of suspension, transmission system, safety knot member etc.So the composition proportion of TRIP steel and the emphasis that thermal treatment process is still Recent study.
Summary of the invention
To being equipped with the problem that occurs in the process at the TRIP steel; In order to make steel plate have good coating ability, weldability and wear resistance; Also has high intensity and plasticity simultaneously; The present invention provides a kind of hot-rolling phase change induction plasticity steel and preparation method thereof, and combines proper heat treatment technology, obtains to have the hot-rolling phase change induction plasticity steel of higher yield strength and unit elongation.
In order to solve the problems of the technologies described above, hot-rolling phase change induction plasticity steel of the present invention, the material of hot-rolling phase change induction plasticity steel is composed of the following components by weight percentage:
C：0.05～0.4％；
Si：0.1～0.5％；
Mn：1～2％；
Cr：0.1～1.5％；
Ni：≤1.5％；
Al：≤0.06％；
N：≤0.01％；
All the other are Fe and unavoidable impurities.
Also contain weight percent in the material of hot-rolling phase change induction plasticity steel of the present invention and be 0.01～0.1% V.
Impurity in the material of hot-rolling phase change induction plasticity steel of the present invention is that to contain weight percent be≤0.005% S for≤0.025% P and weight percent.
The preparation method of a kind of hot-rolling phase change induction plasticity steel of the present invention may further comprise the steps:
(1) according to component and content requirement with all raw materials mix evenly after, in vacuum induction furnace, smelt;
(2) smelt into steel ingot after, steel ingot is heated to 1200 ℃, be incubated and forge into steel billet after 2 hours, steel billet is heated to 1250 ℃ of insulations 1.5 hours, after insulation finishes, it carry out hot rolling system;
(3) process of hot rolling system is: at first carry out roughing, start rolling temperature is 1150～1250 ℃, 3 passage total deformations 85% of roughing; Carry out finish rolling then, 2 passage total deformations of finish rolling are 15%, and rolling temperature is 890～1000 ℃; Finishing temperature is 800～850 ℃, is the thick steel plate of 5-10mm with hot rolling of steel billet at last;
(4) steel plate after the hot rolling is heat-treated: at first 950 ℃ of insulations 30～60 minutes, air cooling to 750～800 ℃ insulation is 30～60 minutes then, and salt bath quenching is handled then; 400-500 ℃ of insulation 20～120 minutes; Roll bending then, air cooling is to room temperature, and finally obtaining tensile strength is 600～900Mpa; Unit elongation is 25%～35%, and strength and ductility product is greater than the hot-rolling phase change induction plasticity steel of 18000MPa%.
Compared with prior art, the invention has the beneficial effects as follows:
Carbon C content is between 0.05～0.4% in the hot-rolling phase change induction plasticity steel of the present invention; Then be not easy to the TRIP effect when carbon content is too low and manifest, the too high then weldableness of carbon content is poor, and unit elongation is also influenced; For keeping steel plate weldableness preferably, carbon content generally gets the small value simultaneously.For alloying element silicon Si, when its content was big, surface of steel plate was prone to produce stable oxide during thermal treatment, makes phase change induction plasticity steel coating ability variation, influences plate surface quality, reduces use properties.So the content that the present invention controls silicon is between 0.1～0.5%.Simultaneously, the present invention has also added 0.1～1.5% Cr, and Cr can dwindle the austenite phase transformation district and improve critical zone transition temperature A
C3, the bainite transformation zone is moved to low-temperature region, reduced martensite transformation temperature (Ms), help residual austenite and obtain.The adding of Cr simultaneously can also improve the wear resistance and the erosion resistance of material.
The present invention also optionally adds 0.01～0.1% V.V is a ferritic stabilizer, generally is used for suppressing the transformation behavior in the TRIP steel, and the effect of precipitation strength, crystal grain thinning is arranged.
The process that hot rolling TRIP steel obtains the austenite phase is easier to relatively; Phase transformation and thermomechanical treatment are merged, can obtain the composition content of different phases and the mechanical property of steel plate with the time through control two-phase region temperature and time, bainite holding temperature.But temperature deviation is strong to transformation behavior and Effect on Performance, has only the difference that makes temperature evenly just can reach all even minimizing steel plate different sites mechanical property of tissue on steel plate width and the length simultaneously.Therefore,, formulated rational heat treatment technology simultaneously, made the TRIP steel that finally makes have HS, high-ductility simultaneously in conjunction with the characteristics of hot-rolling phase change induction plasticity steel alloying constituent of the present invention.
Description of drawings
Fig. 1 is a hot-rolling phase change induction plasticity steel preparation technology synoptic diagram of the present invention;
Fig. 2 is the electron scanning micrograph figure of hot-rolling phase change induction plasticity steel embodiment of the present invention after thermal treatment;
Fig. 3 is hot-rolling phase change induction plasticity steel embodiment two of the present invention electron scanning micrograph figure after heat treatment;
Fig. 4 is hot-rolling phase change induction plasticity steel embodiment three of the present invention electron scanning micrograph figure after heat treatment;
Fig. 5 is hot-rolling phase change induction plasticity steel embodiment four of the present invention electron scanning micrograph figure after heat treatment.
Embodiment
Below tell about detailed process of the present invention through embodiment, it is the convenience in order to understand that embodiment is provided, never be the restriction the present invention.
Fig. 1 shows the preparation technology of hot-rolling phase change induction plasticity steel of the present invention.
Specified the alloying constituent of each embodiment of hot-rolling phase change induction plasticity steel of the present invention in the table 1; Specified thermal treatment (hot rolling system) processing parameter among each embodiment of hot-rolling phase change induction plasticity steel of the present invention in the table 2; Table 3 shows the Elongation test data of each embodiment that the testing method according to national standard obtains.
Embodiment one:
The material of embodiment one hot-rolling phase change induction plasticity steel is formed according to specified each component in the following table 1.
The process of preparation hot-rolling phase change induction plasticity steel is:
(1) according to the component of specified embodiment 1 in the table 1 and content requirement with raw materials mix evenly after, in the 25kg vacuum induction furnace, smelt;
The smelting steel that (2) will have said components and content becomes steel ingot, then steel ingot is heated to 1200 ℃, is incubated and forges into steel billet after 2 hours, and steel billet is heated to 1250 ℃ of insulations 1.5 hours, and insulation carry out hot rolling system to it after finishing;
(3) at first carry out roughing, start rolling temperature is 1200 ℃, 3 passage total deformations 85% of roughing; Carry out finish rolling then, 2 passage total deformations of finish rolling are 15%, and rolling temperature is 1000 ℃; Finishing temperature is 890 ℃, at last with the hot rolling of steel billet thick steel plate of 6.45mm most; Specified the processing parameter of hot rolling system in the table 2.
(4) steel plate after the hot rolling is heat-treated: at first 870 ℃ of insulations 30 minutes, air cooling to 790 ℃ (being the two-phase region) insulation is 30 minutes then, then salt bath (50%KNO
3+ 50%NaNO
3) quench treatment, 400 ℃ of insulations 90 minutes, roll bending then, air cooling finally obtains the hot-rolling phase change induction plasticity steel of high-strength high-plasticity to room temperature.
The Elongation test data of present embodiment one hot-rolling phase change induction plasticity steel are seen table 3.
Embodiment two:
The material of embodiment two hot-rolling phase change induction plasticity steels is formed according to specified each component in the following table 1.
Repeat smelting, hot rolling forging process that embodiment one must prepare hot-rolling phase change induction plasticity steel, but wherein the finishing temperature that is rolled for steel plate of step (3) is 920 ℃, at last with the hot rolling of steel billet thick steel plate of 6.5mm most; Step (4) is different to the thermal treatment and the embodiment one of steel plate, and specifically: at first 900 ℃ of insulations 30 minutes, air cooling to 760 ℃ insulation is 30 minutes then, then salt bath (50%KNO
3+ 50%NaNO
3) quench treatment, 400 ℃ of insulations 90 minutes, roll bending then, air cooling were to room temperature, and the Elongation test data of the final hot-rolling phase change induction plasticity steel that obtains are seen table 3.
Embodiment three:
The material of embodiment three hot-rolling phase change induction plasticity steels is formed according to specified each component in the following table 1.
Repeat smelting, hot rolling forging process that embodiment one must prepare hot-rolling phase change induction plasticity steel, but wherein the finishing temperature that is rolled for steel plate of step (3) is 950 ℃, at last with the hot rolling of steel billet thick steel plate of 6.38mm most; Step (4) is different to the thermal treatment and the embodiment one of steel plate, and specifically: at first 900 ℃ of insulations 30 minutes, air cooling to 760 ℃ insulation is 30 minutes then, then salt bath (50%KNO
3+ 50%NaNO
3) quench treatment, 500 ℃ of insulations 60 minutes, roll bending then, air cooling were to room temperature, and the Elongation test data of the final hot-rolling phase change induction plasticity steel that obtains are seen table 3.
Embodiment four:
The material of embodiment four hot-rolling phase change induction plasticity steels is formed according to specified each component in the following table 1.
Repeat smelting, hot rolling forging process that embodiment one must prepare hot-rolling phase change induction plasticity steel, but wherein the finishing temperature that is rolled for steel plate of step (3) is 970 ℃, at last with the hot rolling of steel billet thick steel plate of 6.55mm most; Step (4) is different to the thermal treatment and the embodiment one of steel plate, and specifically: at first 950 ℃ of insulations 30 minutes, air cooling to 720 ℃ insulation is 30 minutes then, then salt bath (50%KNO
3+ 50%NaNO
3) quench treatment, 500 ℃ of insulations 60 minutes, roll bending then, air cooling were to room temperature, and the Elongation test data of the final hot-rolling phase change induction plasticity steel that obtains are seen table 3.
Each instance hot-rolling phase change induction plasticity steel alloying constituent of table 1
Table 2 hot rolling system and heat treatment process parameter
The Elongation test data of each embodiment of table 3
In sum; Adopt hot rolling hot-rolling phase change induction plasticity steel of the present invention; In its preparation, combine proper heat treatment technology; Make it have higher yield strength and unit elongation, the final steel plate that obtains has good coating ability, weldability and wear resistance, also has high intensity and plasticity simultaneously.
Although invention has been described for top combination figure; But the present invention is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under enlightenment of the present invention; Under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (4)
1. a hot-rolling phase change induction plasticity steel is characterized in that, the material of hot-rolling phase change induction plasticity steel is composed of the following components by weight percentage:
C：0.05～0.4％；
Si：0.1～0.5％；
Mn：1～2％；
Cr：0.1～1.5％；
Ni：≤1.5％；
Al：≤0.06％；
N：≤0.01％；
All the other are Fe and unavoidable impurities.
2. hot-rolling phase change induction plasticity steel according to claim 1 wherein, also contains weight percent and is 0.01～0.1% V.
3. hot-rolling phase change induction plasticity steel according to claim 1 and 2, wherein, impurity is that to contain weight percent be≤0.005% S for≤0.025% P and weight percent.
4. a method for preparing the hot-rolling phase change induction plasticity steel of claim 1 or 2 is characterized in that, may further comprise the steps:
(1) according to component and content requirement with all raw materials mix evenly after, in vacuum induction furnace, smelt;
(2) smelt into steel ingot after, steel ingot is heated to 1200 ℃, be incubated and forge into steel billet after 2 hours, steel billet is heated to 1250 ℃ of insulations 1.5 hours, after insulation finishes, it carry out hot rolling system;
(3) process of hot rolling system is:
At first carry out roughing, start rolling temperature is 1150～1250 ℃, 3 passage total deformations 85% of roughing;
Carry out finish rolling then, 2 passage total deformations of finish rolling are 15%;
Finishing temperature is 850 ℃～1000 ℃, is the thick steel plate of 5-10mm with hot rolling of steel billet at last;
(4) steel plate after the hot rolling is heat-treated: at first 950 ℃ of insulations 30～60 minutes, air cooling to 750～800 ℃ insulation is 30～60 minutes then, and salt bath quenching is handled then; 400-500 ℃ of insulation 20～120 minutes; Roll bending then, air cooling is to room temperature, and finally obtaining tensile strength is 600～900MPa; Unit elongation is 25%～35%, and strength and ductility product is greater than the hot-rolling phase change induction plasticity steel of 18000MPa%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104451400A (en) * | 2014-11-20 | 2015-03-25 | 东北大学 | TRIP-added high-strength steel for hot-dip galvanizing and production method thereof |
| CN104526263A (en) * | 2014-11-17 | 2015-04-22 | 芜湖福司精密模具有限公司 | Method for manufacturing precision machine tool body |
| CN105734431A (en) * | 2016-05-04 | 2016-07-06 | 芜湖市爱德运输机械有限公司 | High-strength elevator |
| CN106086711A (en) * | 2016-08-27 | 2016-11-09 | 郭云琴 | A kind of high intensity, high-ductility TRIP steel plate and preparation method thereof |
| CN110735022A (en) * | 2019-11-20 | 2020-01-31 | 安徽工业大学 | High-strength-ductility ultrahigh-strength automobile steel with cold and hot forming flexibility application |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985016A (en) * | 2003-01-15 | 2007-06-20 | 新日本制铁株式会社 | High-strength hot-dip galvanized steel sheet and method for producing the same |
| CN101191174A (en) * | 2006-11-20 | 2008-06-04 | 宝山钢铁股份有限公司 | Hot-rolling phase change induction plasticity steel with 750MPa-level extension strength and preparation method thereof |
-
2011
- 2011-10-28 CN CN2011103368488A patent/CN102383059A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985016A (en) * | 2003-01-15 | 2007-06-20 | 新日本制铁株式会社 | High-strength hot-dip galvanized steel sheet and method for producing the same |
| CN101191174A (en) * | 2006-11-20 | 2008-06-04 | 宝山钢铁股份有限公司 | Hot-rolling phase change induction plasticity steel with 750MPa-level extension strength and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104526263A (en) * | 2014-11-17 | 2015-04-22 | 芜湖福司精密模具有限公司 | Method for manufacturing precision machine tool body |
| CN104451400A (en) * | 2014-11-20 | 2015-03-25 | 东北大学 | TRIP-added high-strength steel for hot-dip galvanizing and production method thereof |
| CN105734431A (en) * | 2016-05-04 | 2016-07-06 | 芜湖市爱德运输机械有限公司 | High-strength elevator |
| CN106086711A (en) * | 2016-08-27 | 2016-11-09 | 郭云琴 | A kind of high intensity, high-ductility TRIP steel plate and preparation method thereof |
| CN110735022A (en) * | 2019-11-20 | 2020-01-31 | 安徽工业大学 | High-strength-ductility ultrahigh-strength automobile steel with cold and hot forming flexibility application |
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Application publication date: 20120321 |