CN101602078B - Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate - Google Patents
Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate Download PDFInfo
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- CN101602078B CN101602078B CN2009100123585A CN200910012358A CN101602078B CN 101602078 B CN101602078 B CN 101602078B CN 2009100123585 A CN2009100123585 A CN 2009100123585A CN 200910012358 A CN200910012358 A CN 200910012358A CN 101602078 B CN101602078 B CN 101602078B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
The invention relates to a method for manufacturing section steel with high strength and high toughness by using a hot-rolling steel plate. In the method, the hot-rolling steel plate is adopted, cut by a fixed size, heated to 1050DEG C to 1100DEG C by an induction heater under the clamping of a horizontal roller and an upright roller and then bent and manufactured into section steel by using a roller type forming machine set, the section steel is sent into the induction heater, water-cooling quenching is carried out on the section steel after being heated to 930DEG C to 960DEG C within the time of 60 to 150 seconds, the quenching and cooling speed of the section steel is greater than or equal to 8DEG C/S, the section steel after quenching is heated to 630DEG C to 660DEG C by a tempering induction heater to carry out tempering, the tempering time is 80 to 200 seconds, and straightening, flaw detection, surface inspection and sampling inspection are carried out after refining so as to manufacture the section steel with high strength and high toughness. The invention has the characteristics of small internal stress, high strength, high impact toughness, high shape and size precision,good straightness degree and the like. The section steel can be applied to the production of important structural parts, such as the manufacture of components comprising semilunar plates used for theconnection of ocean platform racks, crossbeams of heavy-duty transport trucks and the like.
Description
Technical field
The invention belongs to technical field of metallurgical manufacturing, especially relate to a kind of method of making high-intensity high-tenacity shaped steel with hot rolled steel plate.
Background technology
The production of high-intensity high-tenacity shaped steel, conventional method is to adopt the hot rolled steel plate of high-intensity high-tenacity composition, be processed into the beam steel shape that needs through cold stamping or thermoforming,, obtain the shaped steel glacing flatness that needs through cold leveling then again through the modified mechanical performance that obtains requiring.The shortcoming of traditional mode of production high-intensity high-tenacity shaped steel method is: beam steel shape precision and glacing flatness are poor, energy resource consumption is big, shortcomings such as production cost height, production cycle length.
The present invention has worked out a kind of manufacture method different with conventional method and has produced high-intensity high-tenacity shaped steel, beam steel shape precision height, shaped steel good straightness degree, the energy resource consumption of adopting this production method to produce are few, the high-intensity high-tenacity shaped steel production method that production cost is low, with short production cycle, the shaped steel internal stress is little.
Summary of the invention
The objective of the invention is to overcome the defective of above-mentioned existence, provide a kind of and have that internal stress is little, performance is even, what intensity height, impact flexibility height, shape and size precision height, glacing flatness height, production cost were low makes the method for high-intensity high-tenacity shaped steel with hot rolled steel plate.
The present invention is achieved by the following technical solutions.
The method of making high-intensity high-tenacity shaped steel with hot rolled steel plate of the present invention, comprise the smelting process process, external refining, make steel billet, be rolled into steel plate with the hot continuous rolling unit, it is characterized in that: each chemical analysis mass percent of described hot steel plate is: C:0.10-0.15%, Si:0.10-0.40%, Mn:0.90-1.50%, Ni:0.9-2.0%, Cr:0.30-0.60%, Mo:0.45-0.60%, Cu:0.1-0.20%, Nb:0.005-0.015%, V:0.010-0.040%, Ti:0.005-0.020%, Al:0.010-0.075%, B:0.0005-0.0040%, P＜0.015%, S＜0.005%, N＜0.0080%, all the other are iron, and its concrete manufacture method step is as follows:
1) the hot rolled steel plate scale is cut into the size that shaped steel needs steel plate, under the clamping of plain-barreled roll and edger roll, is heated to 1050 ℃～1100 ℃, with the roll-type forming unit steel plate is bent into shaped steel again by induction heater;
2) this shaped steel is sent into induction heater be heated to 910 ℃～960 ℃ carry out austenitizing after; ,
3) water hardening, its quench cooling rate 〉=8 ℃/s;
4) the tempered again induction heater of shaped steel after the quenching is heated to 630 ℃～660 ℃ tempering, tempering time 80-200s;
5) at last through the section straightener aligning, flaw detection, surface inspection, inspection by sampling just can make high-intensity high-tenacity shaped steel.
High-intensity high-tenacity shape steel producing method process of the present invention can be to carry out continuously, also can be single shaped steel production.Production institute employing equipment and heat treatment method parameter are identical with thermal forming device and modified heat treatment method parameter in single production continuously.
Advantage of the present invention is: with the high-intensity high-tenacity shaped steel that production method of the present invention is produced, have that internal stress is little, performance is even, intensity height, impact flexibility height, shape and size precision height, glacing flatness height, production cost are low.
Each elemental composition scope of design of the present invention and the explanation of compound action reason:
0.10％≤C≤0.15％
Carbon is stronger molten admittedly intensified element, can significantly improve armor plate strength, but the C too high levels can make toughness and plasticity obviously worsen, and the welding performance of steel plate becomes difficulty, and alloying element solid melt in austenite reduces.Therefore when the design composition of steel, reduce the content of carbon as far as possible, have good welding performance and low-temperature impact toughness and welding performance to guarantee steel plate.Therefore C content should be at 0.10-0.15%.
0.90％≤Mn≤1.50％
Mn is weak carbide former, and its influence with deoxidation and elimination sulphur in smelting can reduce austenite transformation temperature, and the refinement ferrite crystal grain is useful to improving armor plate strength and toughness.Simultaneously can also solution strengthening ferrite and the quenching degree that increases steel.But when containing the Mn amount, then have twin crystal martensite and occur, the ductility of steel is degenerated above 1.5% left and right sides.Therefore Mn content is generally between 0.90%-1.50% when composition designs, and optimum content is that control range is 0.9%-1.50%.
0.15％≤Si≤0.40％
Si has deoxidation, has the solution strengthening effect simultaneously, can also delay the formation of carbide greatly, increases stabilization of austenite.But the Si too high levels is prone to field trash, and the Si too high levels has harmfulness to welding local brittle zone.Therefore control silicon at 0.15%-0.40%.
P≤0.015％
P is the harmful element in the steel.P can worsen toughness at cyrystal boundary segregation, and P content height directly has influence on the plasticity and the toughness of steel plate.Its content should be reduced as far as possible, P content≤below 0.015% should be guaranteed.
S≤0.005％
S is the harmful element in the steel.The existence of MnS can reduce the plasticity and the obdurability of steel, reduces the percentage elongation of steel.MnS has certain plasticity, elongates with rolling direction and extends, and has strengthened the anisotropy of steel, and this lateral performance to steel is very unfavorable.The FeS that S and Fe form makes steel produce hot-short crackle in hot rolling and welding.Should guarantee S content≤below 0.005%.
0.30％≤Cr≤0.60％
Add Cr and can reduce the transformation temperature of steel grade, thinning microstructure improves intensity effectively, can also improve steel grade non-oxidizability and high temperature corrosion-resisting performance etc., and many but Cr added, organizing of separating out is thick, causes the embrittlement of steel.Optimum content is about 0.50%.
0.005％≤Nb≤0.015％
Add the remarkable crystal grain thinning of energy and have moderate precipitation strength effect.The strong effect of Nb crystal grain thinning improves austenitic recrystallization temperature with the ground of carbon niobium nitride efficiency when rolling.Another important function of Nb is that reduction phase transformation alternating temperature degree in mild steel makes to promote martensitic formation when quenching.The addition of Nb is relevant with the C content of steel grade, and C content is when 0.13%-0.20%, and the maximum adding quantity of Nb is 0.015%, can present good toughness when Ti-Nb-Mo coexists.Therefore add Nb content≤0.015%.
0.005％≤Ti≤0.020％
Ti has effective nitrogen fixation, adds before the B element in molten steel, must add the Ti element.Ti can be with the fixing nomadic nitrogen atom of the nitride form of titanium, thus it can stop nomadic nitrogen and B formation BN separate out at crystal boundary, prevent that the impact flexibility of steel from worsening.Ti can improve the low-temperature flexibility of parent metal and welding heat affected zone simultaneously, Ti plays the containment effect to welding heat affected zone place grain growth, because numerous forming core particles of TiN, the grain structure of refinement commissure effectively improves the intensity and the impact flexibility of weld seam, melt run effectively.But too much add the alligatoring that Ti can cause the nitride of titanium, unfavorable to low-temperature flexibility, so the content of Ti generally is controlled at about 0.020%, optimum content is about 0.015%.
0.10％≤Cu≤0.20％
In steel, add corrosion resistance, the intensity that Cu can improve steel, improve weldability, mouldability and machinability etc.According to requirement of strength, Cu content should be controlled between the 0.10-0.20%.
0.90％≤Ni?≤2.0％
Ni not only can well play the effect of solution strengthening in steel, can also improve toughness, and it can improve the corrosion resistance of steel well in addition, and alleviates the poly-partially of Cu.But Ni is more expensive microalloy element, and addition is not directly proportional with addition with its intensity and toughness properties more for a long time.Its content should be controlled at below 2.0%.
0.45％≤Mo≤0.60％
Mo has the solution strengthening effect in steel, can improve the quenching degree of steel.Mo belongs to the element that dwindles the austenite phase region, Mo in steel, be present in solid solution mutually with carbide mutually in.Carbide mutually in, when Mo content is low, form compound cementite with iron and carbon; When Mo content is higher, then form the alloy carbide of Mo.Mo promotes martensite transfor mation, but the Mo too high levels can make welding performance and ductility variation.Therefore control Mo content about 0.50%.
0.0010％≤B≤0.0040％
B is strong quenching degree element and intensified element, and a spot of B can improve the quenching degree that hot-rolled coil is held plain plate after adding significantly, in the time of reducing quenching to the requirement of cooling velocity.B add fashionable before, should the free N element in the steel be fixed by adding Ti, and then add the B element, otherwise B can and steel in N formation BN in crystal boundary, separate out, cause impacting severe exacerbation.
0.0％≤Al≤0.075％
Al is the element of crystal grain thinning, adds excessive can the formation when AlN causes continuous casting of Al and forms face crack, and therefore best addition is about 0.050%.
N≤0.0080％
N can make vanadium nitride and carbon niobium nitride with V, and the austenite structure grain growth can play the precipitation strength effect after the rolling end in the time of can effectively stoping the steel billet heating.But N and B have stronger affinity interaction, will severe exacerbation impact flexibility in case form that BN separates out at crystal boundary, and too high in addition N and Al form crackle in steel slab surface easily in conjunction with forming AlN, therefore will control N content N≤0.0080%.
Explanation to smelting technique:
The smelting of high-intensity high-tenacity shaped steel should strict harmful element, pernicious gas and the field trash of controlling in the steel.Sulphur and phosphorus all are very harmful elements.Sulphur, phosphorus content directly have influence on the plasticity and the toughness of steel plate in the steel, and the existence of MnS, oxide inclusions or carbide grade in an imperial examination two-phase particle all can reduce the obdurability of steel and the percentage elongation of steel.MnS has certain plasticity, elongates with rolling direction and extends, and has strengthened the anisotropy of steel, and this lateral performance to steel is very unfavorable.The FeS that sulphur forms makes steel produce hot-short crackle in hot rolling and welding.The technological progress that smelting process is the most outstanding is the development and the application of vacuum metling and furnace outer refining technology.Adopt different smelting processes, the degree of purity of steel is different.One of main task of smelting process flow process is according to the chemical composition of the strict control of product requirement molten steel and guarantee degree of purity, and its implication has two aspects, the one, and with carbon with the fluctuation that adds alloying element is controlled in the narrow as far as possible scope and evenly.This task mainly is to lean on steel spraying powder, hello silk, trimming and fast detecting to solve; The 2nd, by ladle argon-blown, application of vacuum, farthest remove field trash and pernicious gas content.
Explanation to the rolling technique of steel plate:
High-intensity high-tenacity hot-rolled steel plate steel plate is to adopt heavy and medium plate mill production, and milling method is identical with rolling common iron, and finishing temperature is controlled at less than 880 ℃, rolls the back air cooling.
Explanation to heat treatment technics:
Modified heat treatment method is: be included in and shaped steel heated in the induction heating equipment, at 60-150 in time second, be heated to austenitic temperature and be: 910-960 ℃; Then in the water hardening unit, shaped steel behind the austenitizing is quenched, quench cooling rate is 〉=8 ℃/S, shaped steel has obtained the quenched martensite tissue after quenching, the shaped steel of quenched martensite tissue is heated to temperature in induction heating equipment be: 630-660 ℃, the plain plate of opening to the quenched martensite tissue carries out tempering heat treatment, tempering time is 80-200S, tempering heat treatment is the quenched martensite structural transformation of quenched nickelclad a tempered martensite, the heat treatment entire method process of Here it is section steel with high strength and high toughness.
Explanation to induction heating technique:
Eddy-current heating is that the electrical heating mid point can change into the highest a kind of mode of heating of heat energy efficiency, and it is to produce eddy current by radio-frequency induction coil in steel plate to make the steel plate heating, and according to the steel plate different-thickness, the induction power supply of selecting different frequency is to guarantee heat penetration.This heating means are to heat simultaneously along all sections of steel plate thickness direction, thoroughly having changed heating furnace heating in the past is the mode of conducting heat towards steel plate heart portion outside steel plate, firing rate is fast, heating quality is good, steel plate is short in the austenite high-temperature region time of staying, and austenite crystal has little time to grow up, and can obtain the austenite crystal of refinement, the quenched martensite crystal grain that process obtains after quenching is with more miniaturization, and the mechanical performance of steel plate will be better than the shaped steel performance that traditional heat treatment method obtains after the tempering.
The heat treatment mode of eddy-current heating of the present invention can be continous way production, also can adopt individual mode to produce, continuation mode production and individual mode produce institute's employing equipment and the induction heating method parameter identical.
Description of drawings:
Fig. 1 is for being the high-intensity high-tenacity shaped steel of 750MPa with hot rolled steel plate manufacturing surrender, and be 110 seconds heat time heating time, and induction heater is heated to 950 ℃ and makes its austenitizing, and quench cooling rate is the martensitic structure shape appearance figure that 16 ℃/s quenches and obtains.
Fig. 2 is a 750MPa high-intensity high-tenacity shaped steel for surrendering with the hot rolled steel plate manufacturing, the tempered martensite's shape appearance figure after 650 ℃ of process 120s tempering.
The specific embodiment:
The invention will be further described below in conjunction with accompanying drawing.
The method of making high-intensity high-tenacity shaped steel with hot rolled steel plate of the present invention, comprise the smelting process process, external refining, make steel billet, be rolled into steel plate with the hot continuous rolling unit, it is characterized in that: each chemical analysis mass percent of described hot steel plate is: C:0.10-0.15%, Si:0.10-0.40%, Mn:0.90-1.50%, Ni:0.9-2.0%, Cr:0.30-0.60%, Mo:0.45-0.60%, Cu:0.1-0.20%, Nb:0.005-0.015%, V:0.010-0.040%, Ti:0.005-0.020%, Al:0.010-0.075%, B:0.0005-0.0040%, P＜0.015%, S＜0.005%, N＜0.0080%, all the other are iron, and its concrete manufacture method step is as follows:
1) the hot rolled steel plate scale is cut into the size that shaped steel needs steel plate, under the clamping of plain-barreled roll and edger roll, is heated to 1050 ℃～1100 ℃, with the roll-type forming unit steel plate is bent into shaped steel again by induction heater;
2) this shaped steel is sent into induction heater be heated to 910 ℃～960 ℃ carry out austenitizing after; ,
3) water hardening, its quench cooling rate 〉=8 ℃/s;
4) the tempered again induction heater of shaped steel after the quenching is heated to 630 ℃～660 ℃ tempering, tempering time 80-200s;
5) at last through the section straightener aligning, flaw detection, surface inspection, inspection by sampling just can make high-intensity high-tenacity shaped steel.
High-intensity high-tenacity shape steel producing method process of the present invention can be to carry out continuously, also can be single shaped steel production.Production institute employing equipment and heat treatment method parameter are identical with thermal forming device and modified heat treatment method parameter in single production continuously.
Embodiment 1
When adopting thickness of slab is that each chemical analysis mass percent of 40mm is:
When the steel plate of C:0.13%, Si:0.25%, Mn:1.2%, Ni:1.45%, Cr:0.4%, Mo:0.55%, Cu:0.15%, Nb:0.012%, V:0.02%, Ti:0.015%, Al:0.035%, B:0.0018%, P:0.012%, S:0.003%, N:0.0035% was made high-intensity high-tenacity shaped steel, its concrete manufacture method step was as follows:
1) above-mentioned hot rolled steel plate scale is cut into the size that shaped steel needs steel plate, plain-barreled roll and the clamping of edger roll under, be heated to 1050 ℃ by induction heater, with the roll-type forming unit steel plate is bent into shaped steel again;
2) this shaped steel is sent into induction heater and be heated to 950 ℃, be 110 seconds heat time heating time, make its austenitizing after;
3) water hardening, 16 ℃/s of its quench cooling rate;
4) the tempered again induction heater of shaped steel after the quenching is heated to 650 ℃ of tempering, tempering time 120s;
5) at last through section straightener aligning, flaw detection, surface inspection, inspection by sampling just can make mechanical performance and be: Reh:750Mpa, Rm:850Mpa, A%:22%, Akv-40 ℃: the high-intensity high-tenacity shaped steel of 237J, 216J, 248J.
Fig. 1 shows and makes the surrender of high-intensity high-tenacity shaped steel with hot rolled steel plate is 750MPa high-intensity high-tenacity shaped steel, and at 950 ℃ of austenitizings, cooling rate is the martensitic structure shape appearance figure that 16 ℃/s quenches and obtains.
Fig. 2 shows and makes the surrender of high-intensity high-tenacity shaped steel with hot rolled steel plate is 750MPa high-intensity high-tenacity shaped steel, the tempered martensite's shape appearance figure after 650 ℃ of process 160s tempering.
Eddy-current heating hot bending of the present invention and induction heating treatment method, by evidence, the characteristics such as have that equipment is simple, small investment, production efficiency height, product percent of pass height, shaped steel profile are accurate, can be applied to production important structure part with this high-intensity high-tenacity shaped steel, connect the manufacturing of the members such as crossbeam of the meniscus that uses, transport wagon as being used for the ocean platform tooth bar.
Claims (1)
1. method of making high-intensity high-tenacity shaped steel with hot rolled steel plate, comprise the smelting process process, external refining, make steel billet, steel plate is made in hot rolling, it is characterized in that: each chemical analysis mass percent of described hot steel plate is: C:0.10-0.15%, Si:0.10-0.40%, Mn:0.90-1.50%, Ni:0.9-2.0%, Cr:0.30-0.60%, Mo:0.45-0.60%, Cu:0.1-0.20%, Nb:0.005-0.015%, V:0.010-0.040%, Ti:0.005-0.020%, Al:0.010-0.075%, B:0.0005-0.0040%, P＜0.015%, S＜0.005%, N＜0.0080%, all the other are iron, and its concrete manufacture method step is as follows:
1) the hot rolled steel plate scale is cut into the size that shaped steel needs steel plate, under the clamping of plain-barreled roll and edger roll, is heated to 1050 ℃～1100 ℃, with the roll-type forming unit steel plate is bent into shaped steel again by induction heater;
2) this shaped steel is sent into induction heater, at 60-150 in time second, be heated to 910 ℃～960 ℃ carry out austenitizing after;
3) water hardening, its quench cooling rate 〉=8 ℃/s;
4) the tempered again induction heater of shaped steel after the quenching is heated to 630 ℃～660 ℃ tempering, tempering time 80-200s;
5) at last through the section straightener aligning, flaw detection, surface inspection, inspection by sampling just can make high-intensity high-tenacity shaped steel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100123585A CN101602078B (en) | 2009-07-03 | 2009-07-03 | Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100123585A CN101602078B (en) | 2009-07-03 | 2009-07-03 | Method for manufacturing section steel with high strength and high toughness by using hot-rolling steel plate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109136762A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | A kind of semitrailer welding I beam steel and its production method |
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| CN102116409B (en) * | 2010-01-04 | 2015-03-18 | 烟台中集来福士海洋工程有限公司 | Method for moulding high-strength steel semichord pipe |
| CN102010966A (en) * | 2010-12-24 | 2011-04-13 | 沈阳飞机工业（集团）有限公司 | Induction heating localized tempering process for 30CrMnSiNi2A part |
| CN102041371A (en) * | 2011-01-27 | 2011-05-04 | 北京科技大学 | Heat treatment method of high-tenacity high-strength steel plate |
| CN102703809B (en) * | 2011-03-28 | 2014-06-04 | 北大方正集团有限公司 | Hot-rolled steel and manufacturing method thereof |
| CN102392193B (en) * | 2011-11-10 | 2013-06-19 | 舞阳钢铁有限责任公司 | Extra thick quenched and tempered steel plate for ocean platform tooth bar and production method thereof |
| CN103725986B (en) * | 2013-12-19 | 2015-12-30 | 江阴兴澄特种钢铁有限公司 | The special thick rack steel plate of the high tenacity F level used under low temperature and manufacture method thereof |
| CN103695803B (en) * | 2013-12-19 | 2015-12-30 | 江阴兴澄特种钢铁有限公司 | The heavy thickness rack steel that low-carbon-equivalent low-temperature uses and manufacture method thereof |
| CN111455269A (en) * | 2020-03-19 | 2020-07-28 | 鞍钢股份有限公司 | Yield strength 960MPa grade very high strength marine steel plate and manufacturing method thereof |
| CN115747617B (en) * | 2022-11-29 | 2024-04-19 | 北京科技大学 | Titanium reinforced automobile girder steel, preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109136762A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | A kind of semitrailer welding I beam steel and its production method |
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