CN101928873A - Method for processing high-strength and ultrahigh-strength steel plates - Google Patents
Method for processing high-strength and ultrahigh-strength steel plates Download PDFInfo
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- CN101928873A CN101928873A CN 201010262971 CN201010262971A CN101928873A CN 101928873 A CN101928873 A CN 101928873A CN 201010262971 CN201010262971 CN 201010262971 CN 201010262971 A CN201010262971 A CN 201010262971A CN 101928873 A CN101928873 A CN 101928873A
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Abstract
The invention discloses a method for processing high-strength and ultrahigh-strength steel plates. Billet steel billet is smelted by the following chemical components in percentage by weight: 0.05-0.5% of C, 0.1-1.8% of Si, 0.1-1.9% of Mn, proper trace alloy elements and the balance of Fe, and then the billet steel is heated and rolled into a steel plate. The high-strength steel plate can be prepared by a common steel plate by the following steps: conveying the common steel plate into a pre-heating intermediate frequency and super-audio frequency heating furnace by a traction device for sectional heating; fast quenching by a flat-square cylindrical quenching device; tempering by an tempering intermediate frequency heating furnace; and cooling by a cooling device, wherein the yield strength of the high-strength steel plate is greater than or equal to 600 to 1670 MPa, which is 1 to 6 times higher than that of the common steel plate; the tempering metallographic structure is troostite or sorbite; and the granularity reaches over the ninth level. Moreover, the high-strength steel plate has good low temperature resisting impact strength and high cost performance and is widely applicable to major projects such as high-rise buildings, longspan steel structures and shipbuilding industry and more suitable for general projects.
Description
Technical field the present invention relates to a kind of steel, the working method of particularly a kind of high strength and ultrahigh-strength steel plates.
Background technology is present, the steel plate of domestic production, because mechanical property is not high, concentrate on Q235, Q345, Q460 rank, can not satisfy the demand of industries such as Highrise buildings, large-span steel, shipping industry, as be used for above-mentioned occasion, need to increase rolled steel dosage, exist cost big, the problem of waste steel resources; Though Japan adopts ultra-fine brilliant technology to roll out the high tensile steel plate that yield strength reaches 900MPa, China's horse steel adopts controlled rolling and controlled cooling and microalloying technology to roll out the steel plate that yield strength reaches 1100MPa, but still there is the not enough problem of superstrength, and Japan carries out the rolling many rare metals of interpolation that need of ultra-fine crystalline substance, cost an arm and a leg, the required milling equipment accuracy requirement of the rolling technique height that the horse steel adopts, cost investment is big, and technology stability is poor.
Summary of the invention the objective of the invention is to overcome the deficiencies in the prior art, and a kind of new high strength easy to process and the working method of ultrahigh-strength steel plates are provided, and satisfies the demand of domestic and international market to high strength and ultrahigh-strength steel plates.
The present invention seeks to realize like this: press following Chemical Composition: C:0.05～0.5% by steel mill, Si:0.1～1.8%, Mn:0.1～1.9%, select following one or more trace alloying elements Cr:0.1～0.6%, Ni:0.1～0.5%, Nb:0.02～0.5%, Al:0.01～0.1%, B:0.001～0.1% and remainder have been smelted steel billet for Fe, and heating rolling becomes general steel plate, high tensile steel plate also can adopt general steel plate, send into zone heating to 850 in preheating intermediate frequency and the ultrasonic frequency process furnace～1100 ℃ successively through towing mechanism traction transmission, then through flat square tube shape quenching device carry out for the time 20～120 second rapid quenching, be heated to 370～720 ℃ of tempering through tempering heating in medium frequency stove, after refrigerating unit carry out cooling process and get final product to normal temperature; Ruhmkorff coil in above-mentioned preheating heating in medium frequency stove, ultrasonic frequency process furnace and the tempering heating in medium frequency stove is a deltiod, and steel plate can be put in the centre, and its profile and steel plate are complementary, middle and retention gap; Above-mentioned flat square tube shape quenching device is made up of inside and outside wall, hollow end sealing between the inside and outside wall is provided with spray orifice respectively to distance 1～5cm on its inwall in length and breadth, and outer wall is provided with the high-pressure nozzle joint, can be connected to high-pressure pump by high-pressure nozzle, carry out high-pressure spraying and quench.
The invention has the beneficial effects as follows: (1) the present invention utilizes " surface action " of the load coil of preheating intermediate frequency and ultrasonic frequency process furnace that rolling good steel plate is carried out the sectional type heating, can be heated temperature increase to 850～1100 ℃, have the continuous production performance, can satisfy the heating of the steel plate of different specification size; (2) yield strength of this product 〉=600～1670MPa, intensity is very high, exceeds 1～3 times than the yield strength 234,345 and the 460Mpa of traditional general steel plate; (3) interior tissue of this product is tempering troostite or sorbite, and grain fineness number can reach more than 9 grades, has the advantage of good low-temperature impact resistance; (4) the flat square tube shape quenching device of the present invention's employing, form by inside and outside wall, hollow end sealing between two walls, on inwall, to 1～5cm spray orifice is set in length and breadth, the high-pressure nozzle joint is arranged on the outer wall, can connect high-pressure pump, open high-pressure pump and quench, have that quenching hydraulic pressure is big, quenching velocity is fast, the advantage of uniform quenching; (5) the product chemical formulation does not add the rare alloy element, the production cost valency only is 1.1 times of original general steel plate, but because intensity height, the steel plate consumption can reduce more than 50%, in a large amount of saving steel, can replace the import of high strength, ultrahigh-strength steel plates, can export goods and earn foreign currency simultaneously, satisfy the demand of domestic and international market, economic benefit and social benefit are very remarkable; (6) it is easy to process feasible to adopt general steel plate to heat-treat, and yield strength can improve more than 1 times.
Appended drawings 1 is a following process production line schematic flow sheet of the present invention, and Fig. 2 is the application state synoptic diagram of heat induced coil winding of the present invention, and Fig. 3 is a flat square tube shape quenching device structural representation of the present invention.
Among the figure: on behalf of transmission bracket, 2,1 represent preheating heating in medium frequency stove, 3 to represent ultrasonic frequency process furnace, 4 representative flat square tube shape quenching devices, 5 to represent tempering heating in medium frequency stove, 6 to represent refrigerating unit, 7 to represent towing mechanism, 8 to represent steel plate, 9 to represent deltiod ruhmkorff coil, 10 to represent tube end, 11 to represent outer wall, 12 to represent inwall, 13 to represent storage chamber, 14 to represent spray orifice, 15 to represent the high-pressure nozzle joint
The invention will be further described for 3 embodiment below in conjunction with accompanying drawing 1～3 for embodiment.
Example 1: as shown in Figure 2, process the heating in medium frequency stove 2 that has the ruhmkorff coil 9 that is complementary with steel plate 8 profiles earlier, ultrasonic frequency process furnace 3 and tempering heating in medium frequency stove 5, again as shown in Figure 3, process hollow end 10 sealings between the two of inwall 12 and outer wall 11, to distance 5cm spray orifice 14 is set in length and breadth on the inwall 12, the flat square tube shape quenching device 4 that has high-pressure nozzle joint 15 on the outer wall 11, at last as shown in Figure 1, according to the requirement of following process method, be ready to the following process production line, flat square tube shape quenching device 4 is connected high-pressure pump, towing mechanism 7, preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5, refrigerating unit 6 is connected power supply; Simultaneously press C:0.05% by steel mill, Si:0.1%, Mn:1.2%, select following three kinds of trace alloying element Cr:0.15%, Al:0.045%, B:0.001% and remainder have been smelted steel billet for Fe, and the good specification of the heating rolling steel plate 8 that is 70cm * 600cm * 1cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 890 ℃, then by flat square tube shape quenching device 4 carry out for the time 20 second rapid quenching, then be heated to 580 ℃ of tempering through intermediate frequency tempering process furnace 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the ultrahigh-strength steel plates 8 of 710MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 2: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and flat square tube shape quenching device 4 by example 1 described method earlier, the spacing distance of the spray orifice 14 on the inwall 12 of this flat square tube shape device 4 is 3cm, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.20% by steel mill, Si:0.7%, Mn:1.9%, select following three kinds of trace alloying element Cr:0.3%, Ni:0.25%, Al:0.01% and remainder have been smelted steel billet for the prescription of Fe, and the good specification of heating rolling is 100cm * 900cm * 5cm steel plate 8, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 890 ℃, then by flat square tube shape quenching device 4 carry out for the time 60 second rapid quenching, then be heated to 550 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the ultrahigh-strength steel plates 8 of 1000MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 3: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and flat square tube shape quenching device 4 by example 1 described method earlier, the distance of the spray orifice 14 on the inwall 12 of this flat square tube shape device 4 changes 1cm into, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.45% by steel mill, Si:1.8%, Mn:0.3%, select following three kinds of trace alloying element Nb:0.02～0.5%, Al:0.1%, B:0.1% and remaining be the Chemical Composition of the Fe steel plate 8 that to have smelted steel billet and the good specification of heating rolling be 150cm * 900cm * 8cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 970 ℃, then by flat square tube shape quenching device 4 carry out for the time 120 second rapid quenching, then be heated to 420 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the ultrahigh-strength steel plates 8 of 1550MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 4: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and flat square tube shape quenching device 4 by example 1 described method earlier, the distance of the spray orifice 14 on the inwall 12 of this flat square tube shape device 4 changes 1cm into, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, with specification is general steel plate 8 process towing mechanisms 7 tractions of 150cm * 900cm * 8cm, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 910 ℃, then by flat square tube shape quenching device 4 carry out for the time 120 second rapid quenching, then be heated to 480 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the high tensile steel plate 8 of 830MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Claims (4)
1. the working method of high strength and ultrahigh-strength steel plates, it is characterized in that, press Chemical Composition C:0.05～0.5%, Si:0.1～1.8%, Mn:0.1～1.9%, select following one or more trace alloying elements: Cr:0.1～0.6%, Ni:0.1～0.5%, Nb:0.02～0.5%, Al:0.01～0.1%, B:0.001～0.1% is smelted into steel billet with remainder for Fe, and heating rolling becomes steel plate, high strength makes steel plate also can adopt general steel plate, with towing mechanism (7) transmission, send preheating heating in medium frequency stove (2) successively to and ultrasonic frequency process furnace (3) is heated to 850～1100 ℃, then carry out the rapid quenching in 2～120 seconds through flat square tube shape quenching device (4), pass through tempering heating in medium frequency stove (5) again and be heated to 400～700 ℃ of tempering, after refrigerating unit (6) cooling process process to normal temperature.
2. according to the working method of described a kind of high strength of claim 1 and ultrahigh-strength steel plates, it is characterized in that,, respectively there is a ruhmkorff coil (9) described adding in preheating heating in medium frequency stove (2), ultrasonic frequency process furnace (3) and the tempering heating in medium frequency stove (5) that uses man-hour, can put into steel plate (8) in the middle of this ruhmkorff coil (9), its profile and steel plate (8) are complementary and keep certain interval.
3. according to the working method of described a kind of high strength of claim 1 and ultrahigh-strength steel plates, it is characterized in that, the described tubular quenching device (4) that uses man-hour that adds is made up of inwall (12) and outer wall (11), tube end (10) sealing, inwall (12) and outer wall (11) hollow between the two are storage chamber (13), in length and breadth to being provided with spray orifice (14) apart from 1～5cm respectively, outer wall (11) is provided with high-pressure nozzle joint (15) on the inwall (12).
4. according to the working method of described a kind of high strength of claim 1 and ultrahigh-strength steel plates, it is characterized in that, use chemical composition formula to smelt the shaped steel institute product processed yield strength 〉=600～1670MPa of hot rolling of steel billet, use the yield strength 〉=600～850MPa of general steel plate institute product processed, metallographic structure is tempering troostite or sorbite, and grain fineness number reaches more than 9 grades.
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Cited By (8)
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| CN102181797A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Method for processing steel strand for prestressed concrete |
| CN102492824A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Continuous heat treatment method of high-strength steel belts or steel plates |
| CN103422029A (en) * | 2013-07-23 | 2013-12-04 | 由伟 | High-strength and high-tenacity steel with martensite-ferrite complex phase structure |
| CN104088891A (en) * | 2014-06-29 | 2014-10-08 | 奉化市飞天人精密模具设计有限公司 | Automobile connection rod and thermal treatment process thereof |
| CN104962714A (en) * | 2015-06-11 | 2015-10-07 | 江苏博力新能源有限公司 | Machining process of section variable diameter steel structural part |
| CN106282763A (en) * | 2016-08-11 | 2017-01-04 | 宁波市鄞州亚大汽车管件有限公司 | A kind of brake pipe joint |
| CN106282764A (en) * | 2016-08-11 | 2017-01-04 | 宁波市鄞州亚大汽车管件有限公司 | A kind of preparation method of brake pipe joint |
| CN108998634A (en) * | 2018-08-29 | 2018-12-14 | 燕山大学 | A kind of process units of unimach plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102181797A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Method for processing steel strand for prestressed concrete |
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| CN102492824A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Continuous heat treatment method of high-strength steel belts or steel plates |
| CN103422029A (en) * | 2013-07-23 | 2013-12-04 | 由伟 | High-strength and high-tenacity steel with martensite-ferrite complex phase structure |
| CN104088891A (en) * | 2014-06-29 | 2014-10-08 | 奉化市飞天人精密模具设计有限公司 | Automobile connection rod and thermal treatment process thereof |
| CN104962714A (en) * | 2015-06-11 | 2015-10-07 | 江苏博力新能源有限公司 | Machining process of section variable diameter steel structural part |
| CN106282763A (en) * | 2016-08-11 | 2017-01-04 | 宁波市鄞州亚大汽车管件有限公司 | A kind of brake pipe joint |
| CN106282764A (en) * | 2016-08-11 | 2017-01-04 | 宁波市鄞州亚大汽车管件有限公司 | A kind of preparation method of brake pipe joint |
| CN108998634A (en) * | 2018-08-29 | 2018-12-14 | 燕山大学 | A kind of process units of unimach plate |
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Application publication date: 20101229 |