CN106244931A - A kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof - Google Patents

A kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof Download PDF

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Publication number
CN106244931A
CN106244931A CN201510302429.0A CN201510302429A CN106244931A CN 106244931 A CN106244931 A CN 106244931A CN 201510302429 A CN201510302429 A CN 201510302429A CN 106244931 A CN106244931 A CN 106244931A
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China
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steel plate
rolled steel
hot rolled
yield strength
rolling
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CN201510302429.0A
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段争涛
裴新华
凌爱兵
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Shanghai Meishan Iron and Steel Co Ltd
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Shanghai Meishan Iron and Steel Co Ltd
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Priority to CN201510302429.0A priority Critical patent/CN106244931A/en
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Abstract

The present invention relates to a kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof, solve the technical problem that existing yield strength 450MPa level hot rolled steel plate production cost is high.A kind of yield strength 450MPa level hot rolled steel plate, its chemical composition mass percent is: C:0.04 ~ 0.08%, Si:0.10 ~ 0.40%, Mn:1.20 ~ 1.50%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015 ~ 0.040%, Ti:0.04 ~ 0.06%, surplus is ferrum and is unavoidably mingled with, it is organized as ferrite+very small amount pearlite, yield strength >=the 450MPa of hot rolled steel plate, tensile strength >=590MPa, elongation after fracture >=20%.Hot rolled steel plate of the present invention can be used for the fields such as engineering machinery, automobile, railway, container.

Description

A kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof
Technical field
The present invention relates to a kind of hot-rolling high-strength steel plate, particularly to a kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof.
Background technology
Low-alloy structural hot rolled steel plate is a kind of ferrous materials that in strip product, purposes is the widest, usage amount is maximum, it is mainly used in vehicle structure, engineering machinery, building structure and other general structure parts, low-alloy structural steel typically adds the microalloy elements such as Nb, V, Ti, rolled and Controlled cooling process by suitable controlling hot rolling, thus produce the preferable hot rolled steel plate of combination of strength and toughness.
Chinese Patent Application No. 201210415974.7 discloses a kind of railway truck's accessories yield strength 450MPa level steel and production method, it is based on C-Mn, and controlling carbon equivalent Ceq≤0.42%, the technique being equipped with coupling, the steel plate obtained has good welding performance simultaneously.Although C, Mn content is relatively low, but use Nb(0.01 ~ 0.08%), V(0.02 ~ 0.10%) two kinds of microalloy elements, alloy species is more, relatively costly.
Chinese Patent Application No. 201010180589.X discloses a kind of based on converter-CSP short route yield strength 450MPa grade high-strength weathering steel board production technology, it is on the basis of low carbon manganese steel, use Nb(0.015 ~ 0.035%) microalloying+cooling controlling and rolling controlling process production, in order to ensure that weatherability also added Cu:0.25 ~ 0.40%, Ni:0.12 ~ 0.35%, Cr:0.45 ~ 0.75% alloying element such as grade.
Chinese Patent Application No. 200910304129.0 discloses a kind of Nb bearing steel plate and manufacture method thereof, its chemical composition C:0.07 ~ 0.12%, Si≤0.35%, Mn:1.10 ~ 1.50%, P≤0.025%, S≤0.015%, Nb:0 ~ 0.10%, in conjunction with appropriate process, yield strength 350 ~ 410MPa, 400 ~ 460MPa, tri-different stages of 450 ~ 510MPa can be realized, for this composition, with the addition of a certain amount of Nb alloy, cost is the highest.
Therefore, disclosed in prior art, mostly the technical scheme about yield strength 450MPa hot rolled steel plate is by Nb microalloying to be main, add more than one microalloy elements, exist and add too much alloying element or the higher problem of alloying element, add cost of alloy, and then the problem adding manufacturing cost.
Summary of the invention
It is an object of the invention to provide a kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof, solve the technical problem that existing yield strength 450MPa level hot rolled steel plate production cost is high.
Compared with the alloying element such as Nb, V, Ti cost of alloy is relatively low, and the present invention, by the basis of C-Mn composition of steel, uses Ti to substitute Nb, V etc., designs in conjunction with suitable hot rolling technology, on the premise of ensure that material property, reduces cost of alloy.
The technical solution used in the present invention is:
A kind of yield strength 450MPa level hot rolled steel plate, its chemical composition mass percent is: C:0.04 ~ 0.08%, Si:0.10 ~ 0.40%, Mn:1.20 ~ 1.50%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015 ~ 0.040%, Ti:0.04 ~ 0.06%, surplus is ferrum and is unavoidably mingled with.
The reason that yield strength 450MPa level hot rolled steel plate chemical composition of the present invention limits within the above range is as follows:
Carbon: carbon content is favourable to improving intensity, but too high carbon content can form the carbide particle of more thick fragility in steel, unfavorable to plasticity and toughness, carbon content is too high also can be at steel plate central segregation band, also can increase welding carbon equivalent, be unfavorable for welding, and the too low alloy that have to add of carbon content is to improve intensity, relatively costly, the C content that the present invention sets is as 0.04% ~ 0.08%.
Silicon: silicon is solid-solubilized in steel matrix to have significantly strengthens effect, but silicone content is too high unfavorable to steel plate plasticity and toughness, and too high levels can form the serious red iron sheet of the rust being difficult to remove on hot rolled plate surface simultaneously, affects product appearance and sequent surface processes.The present invention limits Si content as 0.10% ~ 0.40%.
Manganese: on the one hand manganese can play the effect of solution strengthening, can improve material quenching degree simultaneously, is to improve one of strength of materials important element, can expand austenitic area simultaneously, reduce ferrite transformation temperature, expand rolling mill practice window.But Mn content is high, easily produces segregation and toughness of material can be reduced, deteriorating performance.The present invention limits Mn content range as 1.20% ~ 1.50%.
Sulfur and phosphorus: toughness of material and plasticity are adversely affected by sulfur and the too high meeting of P elements, and sulfur and too low, can increase again desulfurization and the dephosphorization cost of steel-making.The present invention limits sulfur content and should control within 0.01%, and phosphorus content should control within 0.02%.
Nitrogen: the plasticity of nitrogen content too high meeting severe exacerbation material and toughness, for Ti micro-alloyed high strength steel, the TiN producing large-size is at high temperature combined due to N with Ti, on the one hand the toughness of material is produced impact, on the other hand can reduce steel grade is combined the effective titanium content producing tiny TiC with C, thus causes intensity to reduce.Therefore, the present invention limits nitrogen content and should be less than 0.006%.
Aluminum: aluminum effect in the present invention is the effect playing deoxidation, aluminum is that strong oxidizing property forms oxygen formation Al in element, and steel2O3Remove when steel-making.Aluminum is too high can form too much Al2O3It is mingled with, and continuous casting is easily to block sprue gate.The present invention limits Al content as 0.015%~0.040%.
Titanium: titanium is compared with Nb, V, Mo etc., and the cost of Ti alloy is minimum.Titanium forms the effective fining austenite grains of TiN precipitated phase when high temperature, TiC precipitated phase is formed when low temperature, become more readily available tiny, the precipitated phase of disperse, intensity can be effectively improved, a small amount of Ti just can significantly be strengthened effect, addition is too much, adversely affects the impact flexibility of steel plate.The present invention limits Ti content as 0.04% ~ 0.06%.
A kind of manufacture method of yield strength 450MPa level hot rolled steel plate, the method includes:
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet, the mass percent of wherein said molten steel composition is: C:0.04 ~ 0.08%, Si:0.10 ~ 0.40%, Mn:1.20 ~ 1.50%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015 ~ 0.040%, Ti:0.04 ~ 0.06%, surplus is ferrum and is unavoidably mingled with.
Continuous casting steel billet, in 1210 ~ 1250 DEG C, carries out hot rolling after heating 150 ~ 240min, and described hot rolling is two-stage control rolling mill practice, and roughing is 6 passes, rolls more than austenite recrystallization temperature, and roughing end temp is 1050 ~ 1100 DEG C;Finish rolling 7 passage tandem rolling, entry temperature at finishing 1000 ~ 1050 DEG C, finish rolling end temp is at 830 ~ 890 DEG C;After finish rolling, steel plate finished product thickness is 1.5 ~ 12mm, and section cooling uses leading portion cooling, and 20 ~ 60 DEG C/s of rate of cooling, coiling temperature is to batch to obtain coils of hot-rolled steel when 560 ~ 680 DEG C.
The reason of the hot rolling technology system that the present invention takes is as follows:
1, set slab heating temperature and heat time heating time
Slab heating temperature and the dissolving being set at the granules such as TiN, TiC thick in guarantee continuous casting billet of time, owing to there is a certain amount of Ti, can separate out the granules such as TiN, TiC in continuous casting steel billet cooling procedure.During heating of plate blank, need fully to dissolve the particles such as thick TiN, TiC, it is ensured that the cooling procedure after rolling can the particle such as diffusion-precipitation, tiny TiC, effectively play the precipitating reinforcing effect of Ti.Temperature is too low or heat time heating time is too short, in continuous casting steel billet, the particle such as original thick TiN, TiC can not fully dissolve, and temperature is too high, and heat time heating time is long, slab original structure is thick, serious plus surface oxidation decarburization, is unfavorable for steel plate final performance and surface quality.According to Ti content in chemical composition of the present invention, setting continuous casting steel billet heating-up temperature as 1210 ~ 1250 DEG C, heat time heating time is 150 ~ 240min.
2, roughing end temp sets
Rolling process of rough rolling controls to roll more than austenite recrystallization temperature, it is ensured that obtain the most tiny austenite crystal.Therefore the present invention sets roughing end temp as 1050 ~ 1100 DEG C.
3, finish rolling end temp sets
The final rolling temperature of the present invention acts on of both being set with, on the one hand rolled by austenite Unhydrated cement, obtain inside and have the flat austenite crystal of Zona transformans, laminar cooling process subsequently is transformed into tiny ferrite crystal grain, play the effect of refined crystalline strengthening.On the other hand, final rolling temperature sets TiC particle major part to be prevented precipitation in deformed austenite in advance.The most therefore the present invention sets finish rolling end temp as 830 ~ 890 DEG C.
4, section cooling speed sets
The section cooling speed that the present invention sets is the most crucial, use fast section cooling speed to suppress ferrite crystal grain grow up and TiC is in the precipitation of high temperature section.The TiC particle separating out small and dispersed in quickly making ferrite at a lower temperature is possibly realized.Rate of cooling is the slowest, it is impossible to suppression TiC precipitation in advance in high temperature deformation austenite;Cool down too fast, also plate shape can be brought the biggest impact to unfavorable to steel plate toughness.Section cooling the most of the present invention uses the intensive cooling of leading portion, 20 ~ 60 DEG C/s of rate of cooling.
5, coiling temperature sets
Coiling temperature mainly affects tissue and the performance of strip steel.The too high precipitation being conducive to TiC particle of coiling temperature, but ferrite crystal grain also can drastically be grown up, and reduces band hardness of steel;Coiling temperature is too low, then be unfavorable for the precipitation of TiC particle, it is impossible to preferably plays precipitating reinforcing effect, considers, and the present invention sets hot-rolling coiling temperature as 560 ~ 680 DEG C.
The yield strength 450MPa level hot rolled steel plate that the present invention obtains, its microscopic structure is fine grain ferrite+very small amount pearlite, and grain size number is 10 ~ 12 grades, the yield strength >=450MPa of steel plate, tensile strength >=590MPa, elongation after fracture A >=20%.
The present invention has following good effect compared to existing technology:
1, the present invention is by using the composition of Ti microalloying to design, and replaces the alloys such as Nb, V with Ti, decreases alloy simultaneously and uses, reduces cost of alloy.
2, the component system of the present invention, designs in conjunction with suitable hot rolling technology, the yield strength 450MPa level hot rolled steel plate obtained, and with compared with intensity rank steel plate, reduces alloy and uses, reduces production cost further.
3, the present invention is by the technological design of suitable slab heating temperature, hot rolling finishing temperature, cooling velocity after rolling and coiling temperature, giving full play to refined crystalline strengthening and the precipitation strength of TiC particle, the yield strength 450MPa level hot rolled steel plate obtained has the advantages such as excellent strong plasticity.
Accompanying drawing explanation
Accompanying drawing 1 is the hot rolled steel plate metallographic structure photo of the embodiment of the present invention 4.
Detailed description of the invention
Below in conjunction with embodiment 1 ~ 4, the present invention will be further described, as shown in table 1 ~ table 3.
Table 1 chemical composition of the present invention (mass percent %), surplus is Fe and inevitable impurity.
Requirement is designed according to material composition of the present invention; use molten iron pre-desulfurization; converter top bottom blowing; LF blows Ar process, and RH stove carries out trimming, vacuum circulation degassing processes, and feeds appropriate calcium line simultaneously; carry out Calcium treatment; continuous casting uses low-carbon steel protecting slag, and whole process is blown Ar protective casting, is cast into continuous casting steel billet.
After the heated stove of continuous casting steel billet reheats, rolling on hot tandem rolling mill, process control parameter is shown in Table 2, after roughing milling train and finish rolling Continuous mill train controlled rolling, it is controlled quickly cooling down, then batches, producing qualified hot-rolled sheet coil, steel plate finished product thickness is 1.5 ~ 12mm.
Table 2 hot rolling technology of the present invention controls parameter
Hot Rolling Parameters Slab heating temperature/DEG C Heat time heating time/min Roughing end temp/DEG C Finish rolling end temp/DEG C Laminar flow leading portion rate of cooling/DEG C/s Coiling temperature/DEG C
The present invention 1210~1250 150~240 1050~1100 830~890 20~60 560~680
Embodiment 1 1222 160 1070 883 57 650
Embodiment 2 1235 183 1055 871 45 630
Embodiment 3 1243 232 1087 860 30 600
Embodiment 4 1238 198 1093 830 32 570
Utilize the yield strength 450MPa level hot rolled steel plate that said method obtains.Referring to the drawings, the microscopic structure of hot rolled steel plate is fine grain ferrite+very small amount pearlite, and grain size number is 10 ~ 12 grades.
The hot rolled steel plate present invention obtained carries out tension test according to " GB/T228.1-2010 metal material stretching test part 1: room temperature test method ", according to " GB/T 232-2010 " bend test of metal materials method " is curved test, and its mechanical property is shown in Table 3.
The hot rolled steel plate that the present invention obtains has good obdurability and good brake forming, the yield strength >=450MPa of hot rolled steel plate, tensile strength >=590MPa, elongation after fracture >=20%, and 180 ° of bend tests, d=0a is intact.
The mechanical property of table 3 hot rolled steel plate of the present invention
In addition to the implementation, the present invention can also have other embodiments.The technical scheme that all employing equivalents or equivalent transformation are formed, all falls within the protection domain of application claims.

Claims (5)

1. a yield strength 450MPa level hot rolled steel plate, the mass percent of its chemical composition is: C:0.04 ~ 0.08%, Si:0.10 ~ 0.40%, Mn:1.20 ~ 1.50%, P≤0.02%, S≤0.01%, N≤0.0060%, Al:0.015 ~ 0.040%, Ti:0.04 ~ 0.06%, surplus is ferrum and is unavoidably mingled with.
2. yield strength 450MPa level hot rolled steel plate as claimed in claim 1, it is organized as fine grain ferrite+very small amount pearlite, and described tissue grain size is 10 ~ 12 grades.
3. the yield strength 450MPa level hot rolled steel plate as described in claim 1 and 2, its 1.5 ~ 12mm thickness hot rolled steel plate yield strength >=450MPa, tensile strength >=590MPa, elongation after fracture >=20%.
4. the manufacture method of the yield strength 450MPa level hot rolled steel plate as described in as arbitrary in claim 13, including:
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet;
Continuous casting steel billet, in 1210 ~ 1250 DEG C, carries out hot rolling after heating 150 ~ 240min, and described hot rolling is two-stage control rolling mill practice, and roughing is 6 passes, rolls more than austenite recrystallization temperature, and roughing end temp is 1050 ~ 1100 DEG C;Finish rolling 7 passage tandem rolling, entry temperature at finishing 1000 ~ 1050 DEG C, finish rolling end temp is at 830 ~ 890 DEG C;After finish rolling, section cooling uses leading portion cooling, and 20 ~ 60 DEG C/s of rate of cooling, coiling temperature is to batch to obtain coils of hot-rolled steel when 560 ~ 680 DEG C.
5. the manufacture method of high tensile hot rolled steel sheet as claimed in claim 4, it is characterised in that after finish rolling, controlling steel plate finished product thickness is 1.5~12mm.
CN201510302429.0A 2015-06-04 2015-06-04 A kind of yield strength 450MPa level hot rolled steel plate and manufacture method thereof Pending CN106244931A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108929987A (en) * 2018-06-28 2018-12-04 武汉钢铁有限公司 A kind of 460MPa grades of cold rolling micro-alloy high-strength steel and its manufacturing method
CN109536847A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method
CN109536846A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method
CN110499470A (en) * 2019-08-07 2019-11-26 邯郸钢铁集团有限责任公司 Inexpensive light-type 600MPa grades of motor vehicle body steel and its production method
CN112048679A (en) * 2020-08-18 2020-12-08 包头钢铁(集团)有限责任公司 Production method of low-cost 490MPa bridge steel plate with yield strength

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101565794A (en) * 2008-04-22 2009-10-28 宝山钢铁股份有限公司 High-strength hot rolling automotive frame steel plate and manufacturing method thereof
KR20120001017A (en) * 2010-06-29 2012-01-04 현대제철 주식회사 Hot rolled high strength steel sheet with excellent pipe expandability for casting and tubing and method of manufacturing the steel sheet
CN104278196A (en) * 2014-09-29 2015-01-14 东北大学 Steel for lightweight tubeless wheel rim of commercial vehicle and preparation method of steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101565794A (en) * 2008-04-22 2009-10-28 宝山钢铁股份有限公司 High-strength hot rolling automotive frame steel plate and manufacturing method thereof
KR20120001017A (en) * 2010-06-29 2012-01-04 현대제철 주식회사 Hot rolled high strength steel sheet with excellent pipe expandability for casting and tubing and method of manufacturing the steel sheet
CN104278196A (en) * 2014-09-29 2015-01-14 东北大学 Steel for lightweight tubeless wheel rim of commercial vehicle and preparation method of steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
蔡宁等: "Ti微合金化700MPa级汽车大梁钢的研究", 《轧钢》 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109536847B (en) * 2017-09-21 2020-12-08 上海梅山钢铁股份有限公司 Hot rolled steel plate for welded pipe with yield strength of 390MPa and manufacturing method thereof
CN109536847A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 390MPa grades of welded tube hot rolled steel plates of yield strength and its manufacturing method
CN109536846A (en) * 2017-09-21 2019-03-29 上海梅山钢铁股份有限公司 Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method
CN109536846B (en) * 2017-09-21 2020-12-08 上海梅山钢铁股份有限公司 High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof
CN108929987A (en) * 2018-06-28 2018-12-04 武汉钢铁有限公司 A kind of 460MPa grades of cold rolling micro-alloy high-strength steel and its manufacturing method
CN110499470A (en) * 2019-08-07 2019-11-26 邯郸钢铁集团有限责任公司 Inexpensive light-type 600MPa grades of motor vehicle body steel and its production method
CN110499470B (en) * 2019-08-07 2021-08-20 邯郸钢铁集团有限责任公司 Low-cost light 600 MPa-grade automobile compartment body steel and production method thereof
CN112048679A (en) * 2020-08-18 2020-12-08 包头钢铁(集团)有限责任公司 Production method of low-cost 490MPa bridge steel plate with yield strength

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Application publication date: 20161221