CN102363829A - Heat treatment system used for producing ultrahigh strength steel - Google Patents
Heat treatment system used for producing ultrahigh strength steel Download PDFInfo
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- CN102363829A CN102363829A CN2011103585831A CN201110358583A CN102363829A CN 102363829 A CN102363829 A CN 102363829A CN 2011103585831 A CN2011103585831 A CN 2011103585831A CN 201110358583 A CN201110358583 A CN 201110358583A CN 102363829 A CN102363829 A CN 102363829A
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Abstract
The invention discloses a heat treatment system used for producing ultrahigh strength steel. The technological layout of the system is that: (1) a quenching machine is arranged behind a roller-hearth quenching furnace; a long transporting roll table with a length of 30 to 35m is arranged behind the quenching machine; and an open-fire low-temperature roller-hearth tempering furnace is arranged behind the transporting roll table; (2) a steel plate is heated in the roller-hearth quenching furnace, and the temperature is maintained; (3) the quenching machine is configured as in a quenching mode; and the technological speed of the quenching machine is controlled at 5 to 6m/min according to the thickness of the steel plate, wherein the thickness of the steel plate is 8 to 60mm. (4) the steel plate is heated; the temperature is maintained; the steel is fetched and quenched; the quenched steel plate is places on the transporting roll table for self-tempering, wherein the self-tempering temperature is Ms to Mf (the specific temperature is determined according to the steel type); (5) when self-tempering is finished, the steel plate is delivered to the tempering furnace in time with high speed for carrying out carbon distribution, wherein the temperature is maintained; the steel plate is delivered forward according to a preset technological speed; (6) when a carbon distribution time is satisfied, the steel plate is fetched from the furnace in time to be air-cooled; (7) when the steel plate is processed through a Q+P process, the steel plate can be transported to another tempering furnace for tempering when necessary.
Description
Affiliated technical field
The invention belongs to steel-smelting technology, particularly relate to a kind of heat treatment system of producing super-high strength steel.
Background technology
The configuration of Wide and Thick Slab factory HTFX generally has normalizing furnace, quenching furnance and quenching press, i.e. a normalizing production line, a tempering product line are accomplished steel plate normalizing, modified, tempering, normalizing+tempering process.Quenching and tempering operation at typical process floor plan light plate is: the steel plate Shot Blasting; Pack into quenching furnance heating of steel plate; The steel plate quenching of coming out of the stove; Quenched nickelclad roll off the production line collection, stacking; Normalizing furnace or quenching furnance are cooled to tempering temperature; The quenched nickelclad material loading is treated tempering; The steel plate tempering stove heating tempering of packing into; The tempering steel plate air cooling of coming out of the stove.Therefore, hardened and tempered steel plate can only be by batch producing, and general production batch amount is 2500～3000 tons; Can not in time get into the tempering stove tempering behind the steel plate quenching.
A kind of new thermal treatment process of producing High Strength Structural Steel develops; Its technological process is between the Ms to Mf with steel plate quenching; In time steel plate is carried out the carbon allocation process in certain temperature insulation; The heat treated novel process of this steel is called quenching (quenching)+distribution (partitioning) technology, is called for short Q+P technology.Steel through the Q+P+T heat-treated sturcture is: tempered martensite+residual austenite.Q+P+T handles the back something lost has a certain amount of retained austenite, the toughness predicament of the plow-steel of partly loosening; Also have the intergranular precipitation of complicated carbide in the steel, make to be precipitation strength.Therefore high-strength steel is after Q+P handles, and steel plate has higher intensity and toughness cooperates, and is a kind of brand-new thermal treatment process.As: the Q+P+T steel tool tensile strength Rm of 0.14%C surpasses 2000MPa, elongation A>10%; Rm～the 1500MPa of the Q+P+T steel of 0.12%C, A are 14%; Q+P+T steel Rm～900MPa of 0.11%C.
But pointed as famous material scholar Xu ancestral academician that shines, also there are following problem in the production of Q+P+T steel and development: links such as pure, the homogeneous of plow-steel etc. must smelting, continuous casting and rolling processing are paid much attention to; Improving product strength and weight reduction also needs to be attempted carrying out by Machine Design teacher; Plow-steel especially intensity waits to solve greater than the processing of the ultrahigh-strength steel of 2000MPa and HTFX, technology and operation.
At present, the floor plan of all Wide and Thick Slab factory thermal processing equipments both at home and abroad all can not satisfy the needs of Q+P technology.The tempering stove of carbon-free allocation process behind the quenching press; Carbon allocation process temperature is low simultaneously, and radiator tube heating roller hearth furnace low-temperature zone non-uniform temperature needs to be equipped with the naked light tempering stove and guarantees that the low-temperature zone temperature is even behind the quenching press, satisfy the requirement that steel plate carbon distributes technology.
Q+P arts demand steel plate quenching gets into immediately and carries out the carbon allocation process in the tempering stove between the Ms to Mf.
One Chinese patent application numbers 201110029418.1 discloses " a kind of heat treating method of high-toughness high-strength steel plate "; The main points of this technology are: after steel plate heats in roller hearth heat-treated furnace; Shrend or oil quenching are between Ms～Mf or between Bs～Bf; The back is heated to 560～780 ℃ of insulation 5～120s with induction heater with 3～50 ℃ speed and carries out tempering, and air cooling is to room temperature at last.The carbonitride that is organized as small and dispersed distribution on poor carbon martensite, bainite, small portion of residual austenite and martensite or the bainite matrix that steel plate obtains has the high-intensity high-tenacity steel plate.Apparatus and process floor plan such as Fig. 1 of this invention.The weak point of this invention: the temperature of carbon allocation requirements is low, and during tempering temperature to 560～780 ℃, martensite and residual austenite must be decomposed; Steel plate lattice imperfection place produces the eddying effect heating during induction heating, and local temperature is high, can not satisfy the processing requirement that carbon distributes.
Summary of the invention
The present invention aims to provide a kind of heat treatment system of producing super-high strength steel, and this system comprises by roller bottom type quenching furnance, quenching press, rollgang, naked light tempering stove and forming.Steel plate send quenching press to quench after adding the steel plate heating, and control quenching press roller table speed makes steel plate quenching between Ms～Mf, steel plate is sent in the naked light tempering stove to be incubated fast, in PT (carbon dispense temperature), carries out carbon and distributes, air cooling after steel plate is come out of the stove.
Technical scheme of the present invention: produce the heat treatment system of super-high strength steel, its processing set-up is followed successively by:
(1) arranges quenching press behind the roller bottom type quenching furnance, arrange the long conveyor roller of 30～35m behind the quenching press, arrange naked light low temperature roller bottom type tempering stove behind the conveyor roller;
(2) the steel plate roller bottom type quenching furnance heat tracing of packing into;
(3) quenching press is set to the quenching pattern, according to steel plate gauge control quenching press process speed at 5～60m/min (thickness of slab 8～60mm);
(4) quenchings of coming out of the stove after steel plate heating, the insulation, the back steel plate that quenches are placed conveyor roller and are returned redly, return red temperature (actual temp is definite according to steel grade) between Ms～Mf;
(5) steel plate returns red end, in time sends into tempering stove at a high speed and carries out carbon distribution insulation, and steel plate moves forward by the process speed of setting;
(6) after steel plate satisfies the carbon distribution time, the air cooling of in time coming out of the stove;
(7) after steel plate Q+P handles, can change other tempering stove when needing tempering over to and carry out tempering.
Principle of work of the present invention: according to returning red temperature (between Ms～Mf) after the selected quenching of steel plate material; Utilize the operation process speed control of quenching press to return red temperature to the different thickness steel plate; Steel plate goes out to return behind the quenching press red end and in time sends into tempering stove and carry out the carbon allocation process; Utilize the uniform characteristics of naked light tempering stove cryogenic temperature to guarantee the processing quality of steel plate carbon allocation process, steel plate tissue, performance are even.
Compared with prior art, the present invention has the following advantages: the layout tempering stove can be realized Q+P technology behind quenching press; Arrange the long roller-way of 30～35m behind the quenching press, guarantee steel plate go out fully return behind the quenching press red, the temperature precise control; The steel plate template was good, controlled after quenching press quenched; Naked light tempering stove low-temperature zone furnace temperature is even, and organize steel plate carbon distribution back, performance is even.
Description of drawings
Fig. 1 is application number 201110029418.1 patent processing unit layout n.s.Among the figure: 1-quenching furnance, 2-quenching press, 3-rollgang, 4-steel plate, 5-induction tempering stove.
Fig. 2 is a steel plate Q+P heat treatment system processing unit layout n. of the present invention.Among the figure: 6-roller bottom type quenching furnance, 7-steel plate, 8-roller quenching machine, 9-conveyor roller, 10-naked light roller bottom type tempering stove.
Specific embodiments
Embodiment is described further the present invention below in conjunction with accompanying drawing.
As shown in Figure 2, for steel plate Q+P heat treatment system equipment layout of the present invention is followed successively by: roller bottom type quenching furnance 6, steel plate 7, roller quenching machine 8, conveyor roller 9, naked light roller bottom type tempering stove 10.The roller bottom type quenching furnance adopts the radiator tube non-oxidation roller hearth furnace, goes into the stokehold steel plate at first through shot peening, because the N2 protection is arranged in the stove, surface of steel plate non-oxidation, no marking are to satisfy the great surface quality requirement; The roller press type quenching press is that the roll gap between top rack roller and the lower bearing bracket roller is adjusted to thickness of slab+2 ~ 3mm, and steel plate moves between roller, and through the sectional adjustment of the upper and lower water yield of frame length direction, steel plate is in the middle quenching that travels forward; The naked light tempering stove adopts concentrates heat exchange type, and the furnace heat transfer mode is main with convection current, and this kind type of furnace is even in the low-temperature zone furnace temperature, is superior to the radiator tube heating type of furnace.
Its processing set-up is followed successively by:
Arrange quenching press behind (1) 50～80m roller bottom type quenching furnance, quenching press length 18～30m arranges the long conveyor roller of 30～35m behind the quenching press, arranges naked light low temperature roller bottom type tempering stove behind the conveyor roller, naked light tempering stove length 60～100m;
(2) the steel plate roller bottom type quenching furnance heat tracing of packing into;
(3) quenching press is set to the quenching pattern, according to steel plate gauge control quenching press process speed at 5～60m/min (thickness of slab 8～60mm).
(4) quenchings of coming out of the stove after steel plate heating, the insulation, the back steel plate that quenches are placed conveyor roller and are returned redly, return red temperature (actual temp is definite according to steel grade) between Ms～Mf;
(5) steel plate returns red end, in time sends into tempering stove at a high speed and carries out carbon distribution insulation, and steel plate moves forward by the process speed of setting;
(6) after steel plate satisfies the carbon distribution time, the air cooling of in time coming out of the stove;
(7) after steel plate Q+P handles, can change other tempering stove when needing tempering over to and carry out tempering;
(8) plate property is seen table 1, table 2 after the steel plate Q-T of identical component and the Q-P art breading.Armor plate strength through after the Q-P art breading has reached higher level, and steel plate keeps high toughness.
Plate property after the table 1 Q-P art breading
Plate property after the table 2 Q-T art breading
Claims (1)
1. produce the heat treatment system of super-high strength steel, it is characterized in that its processing set-up is followed successively by:
(1) arranges quenching press behind the roller bottom type quenching furnance, arrange the long conveyor roller of 30～35m behind the quenching press, arrange naked light low temperature roller bottom type tempering stove behind the conveyor roller;
(2) the steel plate roller bottom type quenching furnance heat tracing of packing into;
(3) quenching press is set to the quenching pattern, according to steel plate gauge control quenching press process speed at 5～60m/min (thickness of slab 8～60mm);
(4) quenchings of coming out of the stove after steel plate heating, the insulation, the back steel plate that quenches are placed conveyor roller and are returned redly, return red temperature (actual temp is definite according to steel grade) between Ms～Mf;
(5) steel plate returns red end, in time sends into tempering stove at a high speed and carries out carbon distribution insulation, and steel plate moves forward by the process speed of setting;
(6) after steel plate satisfies the carbon distribution time, the air cooling of in time coming out of the stove;
(7) after steel plate Q+P handles, can change other tempering stove when needing tempering over to and carry out tempering;
De-stacking after 2 ~ 94 hours.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194593A (en) * | 2013-04-09 | 2013-07-10 | 舞阳钢铁有限责任公司 | Residual quenching heat control process in hardening and tempering of high-strength steel |
| CN103898427A (en) * | 2014-04-18 | 2014-07-02 | 深圳市意大隆珠宝首饰有限公司 | Platinum hardening process |
| CN104313295A (en) * | 2014-10-27 | 2015-01-28 | 中冶南方(武汉)威仕工业炉有限公司 | Continuous tempering furnace of roller hearth plates and annealing method thereof |
| CN104388662A (en) * | 2014-10-27 | 2015-03-04 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-hearth type plate continuous tempering furnace and tempering method thereof |
| CN109880983A (en) * | 2019-04-15 | 2019-06-14 | 贝斯山钢(山东)钢板有限公司 | One kind producing thin gauge hardened and tempered steel plate Quench heating method based on nitrogen protection roller hearth heat-treated furnace |
| CN115023510A (en) * | 2020-01-27 | 2022-09-06 | 日立金属株式会社 | Method for producing martensitic stainless steel strip and martensitic stainless steel strip |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102041371A (en) * | 2011-01-27 | 2011-05-04 | 北京科技大学 | Heat treatment method of high-tenacity high-strength steel plate |
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2011
- 2011-11-14 CN CN2011103585831A patent/CN102363829A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102041371A (en) * | 2011-01-27 | 2011-05-04 | 北京科技大学 | Heat treatment method of high-tenacity high-strength steel plate |
Non-Patent Citations (3)
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| 万焱: "唐钢中厚板热处理生产线", 《山西冶金》, no. 2, 30 April 2011 (2011-04-30), pages 64 - 65 * |
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| 苗英杰等: "舞钢中厚板热处理生产概况", 《中国冶金》, vol. 21, no. 2, 28 February 2011 (2011-02-28) * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103194593A (en) * | 2013-04-09 | 2013-07-10 | 舞阳钢铁有限责任公司 | Residual quenching heat control process in hardening and tempering of high-strength steel |
| CN103194593B (en) * | 2013-04-09 | 2015-06-17 | 舞阳钢铁有限责任公司 | Residual quenching heat control process in hardening and tempering of high-strength steel |
| CN103898427A (en) * | 2014-04-18 | 2014-07-02 | 深圳市意大隆珠宝首饰有限公司 | Platinum hardening process |
| CN103898427B (en) * | 2014-04-18 | 2016-05-18 | 深圳市意大隆珠宝首饰有限公司 | A kind of platinum hardening process |
| CN104313295A (en) * | 2014-10-27 | 2015-01-28 | 中冶南方(武汉)威仕工业炉有限公司 | Continuous tempering furnace of roller hearth plates and annealing method thereof |
| CN104388662A (en) * | 2014-10-27 | 2015-03-04 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-hearth type plate continuous tempering furnace and tempering method thereof |
| CN104388662B (en) * | 2014-10-27 | 2016-06-29 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-bottom type sheet material continuous tempering furnace and tempering method thereof |
| CN104313295B (en) * | 2014-10-27 | 2016-06-29 | 中冶南方(武汉)威仕工业炉有限公司 | Roller-bottom type sheet material continuous tempering furnace and tempering method thereof |
| CN109880983A (en) * | 2019-04-15 | 2019-06-14 | 贝斯山钢(山东)钢板有限公司 | One kind producing thin gauge hardened and tempered steel plate Quench heating method based on nitrogen protection roller hearth heat-treated furnace |
| CN115023510A (en) * | 2020-01-27 | 2022-09-06 | 日立金属株式会社 | Method for producing martensitic stainless steel strip and martensitic stainless steel strip |
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Application publication date: 20120229 |