CN109536846A - Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method - Google Patents
Yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method Download PDFInfo
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- CN109536846A CN109536846A CN201710861264.XA CN201710861264A CN109536846A CN 109536846 A CN109536846 A CN 109536846A CN 201710861264 A CN201710861264 A CN 201710861264A CN 109536846 A CN109536846 A CN 109536846A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing method, the toughness for solving existing yield strength 700MPa level hot rolled steel plate is low, manufacturing cost is high technical problem.Yield strength 700MPa grade high ductility hot rolled steel plate provided by the invention, its chemical component weight percentage are as follows: C:0.06~0.10%, Si≤0.10%, Mn:1.20~1.80%, P≤0.012%, S≤0.006%, N≤0.0040%, Al:0.015~0.040%, Mo:0.10~0.30%, Ti:0.06~0.12%, surplus are iron and are unavoidably mingled with.- 40 DEG C of impact toughness value Akv >=120J of the present invention 1.5~14.0mm thickness hot rolled steel plate.It can be used for the fields such as engineering machinery, automobile, railway, pipeline, container.
Description
Technical field
The present invention relates to a kind of high tensile hot rolled steel sheet, in particular to a kind of yield strength 700MPa grade high ductility hot-rolled steel
Plate and its manufacturing method, belong to technical field of iron-base alloy.
Background technique
Hot-rolling high-strength steel can play the high-strength effect be thinned, reduce equipment self-weight, reducing energy consumption, hot-rolling high-strength steel
It is widely used in the industries such as engineering machinery, automobile, railway, pipeline, container.General hot-rolled low-alloy steel high-strength steel is mainly adopted
Intensity is improved with microalloy elements such as single or compound addition Nb, V, Ti, it is past in the above rank steel of yield strength 700MPa
The alloying elements such as further addition Cr, Ni, Mo, the B of contact needs, Lai Tigao intensity, and with alloying element type and content
Increase, while improving steel strength, the reduction of toughness, especially low-temperature impact toughness can be brought.High-strength steel is in production work
In skill, other than conventional cooling controlling and rolling controlling process, relatively conventional also controlled rolling and controlled cooling+tempering process (TMCP+ tempering process),
Controlled rolling+hardening and tempering process.From the aspect of technology controlling and process angle and cost, using less alloy and process, made to reducing
Make cost advantages.Therefore how under the premise of few addition alloying element, using cooling controlling and rolling controlling process, in the intensity for guaranteeing steel plate
Meanwhile and can guarantee plasticity, toughness index, it is the technology hardly possible that iron and steel enterprise researches and develops that new low-cost high-toughness high strength steel plate faces
Topic.
The Chinese patent application file of application publication number CN105200332A discloses 700MPa grades of thin gauge high-strength steel bands
And its production method, ingredient are designed using Nb (≤0.065%), Ti (0.045~0.06%) and Cr (0.25~0.5%),
Cost of alloy is relatively low, but increases annealing process, and finished product thickness is only 1.2-2.5mm, it is clear that the ingredient is only applicable to
Thin gauge.
The Chinese patent application file of application publication number CN106591714A discloses 700MPa grades of engineering machines of yield strength
Tool steel plate and preparation method thereof, ingredient are designed using Nb (0.055~0.065%), Ti (0.095~0.105%) and Mo
(0.1~0.15%) microalloying.Specific suitable thicknesses range is not specified, only refers to 6,8 and 10mm in embodiment, is not said yet
The bright tough implementations of steel plate, and need to be put into coiler furnace after coiler plate, alloy and process cost are higher.
The Chinese patent application file of application publication number CN104018087A discloses a kind of yield strength 700MPa or more
Steel for automobile crossbeam and its manufacturing method, ingredient design and use Nb (0.03~0.06%), Ti (0.06~0.2%), Cr
(0.35~0.55) and Mo (≤0.25%) microalloying, using 2~8mm of thickness, yield tensile ratio is 0.9 hereinafter, also not referring to tough
Implementations, section cooling need cooling using three-stage.
The Chinese patent application file of application publication number CN106756564A discloses a kind of yield strength 700MPa grades of steel
Band and its production method are designed using Nb (0.05~0.07%), Ti (0.08~0.13%) microalloying, are used in production
TMCP technique, it is clear that cost of alloy is lower, simple process, but its product thickness is 1.2~4.0mm, is only applicable to thin gauge production
Product.
The Chinese patent application file of application publication number CN102226250A discloses the heat of yield strength 700MPa a kind of
Rolled steel plate and preparation method thereof, ingredient design using Nb (0.06~0.08%), Ti (0.09~0.12%), B (0.0008~
0.005) microalloying, furthermore Si content is (0.15-0.3%), using with a thickness of 5.0~10.0mm, -60 DEG C of half-size scale punchings
Hit function > 79.Since a certain amount of B is added in steel plate, it is clear that it is larger to there is a problem of that impact toughness value fluctuates.
A kind of yield strength 700MPa grade high-strength of the Chinese patent application file of application publication number CN103014539A is high
Flexible steel plate and its manufacturing method, prepared -60 DEG C of impact toughness values of steel plate are in 150J or more, toughness with higher, but its
It is more that ingredient design uses Ti (0.01-0.25%), Cr (0.3-0.75%), Mo (0.1-0.3%), Ni (0.1-0.4%) etc.
The kind compound addition of alloy, cost of alloy is also higher, and tempering is furthermore used in technique.
The Chinese patent application file of application publication number CN104694822A discloses a kind of yield strength 700MPa grades high
Strength hot rolled steel plates and its manufacturing method are designed using Nb (0.024~0.07%), Ti (0.08~0.15%) microalloying,
TMCP technique is used in production, has the advantages that cost of alloy is low, -40 DEG C of low-temperature impact works are in >=80J, suitable thicknesses
3.0~12mm.
Therefore, the technical solution for being disclosed about yield strength 700MPa hot-rolling high-strength steel plate in the prior art largely uses
Based on Nb-Ti microalloy, it is properly added one of alloying elements such as V, Cr, Mo, Ni or several compound additions is strong to improve
Degree, alloy addition level is larger, causes resource consumption big, and manufacturing cost is higher.Few part Nb-Ti microalloying is that surrender is strong
700MPa level hot rolled steel plate is spent, and there are the problems that toughness is not high or suitable thicknesses are relatively thin.In addition there are a part surrender is strong
700MPa grades of hot-rolled steels production processes of degree are more, but also manufacturing cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of yield strength 700MPa grade high ductility hot rolled steel plate and its manufacturing methods, solve
The technical problem that the toughness of existing yield strength 700MPa level hot rolled steel plate is low, manufacturing cost is high, meet engineering machinery, automobile,
Demand of the industries such as railway, pipeline, container to low-cost high-toughness high tensile hot rolled steel sheet.
Technical thought of the invention is, by using appropriate Mo-Ti microalloying, in conjunction with suitable ingredient and hot rolling technology
Design, under the premise of ensure that the strength of materials, improves the low-temperature impact toughness of hot rolled steel plate.
The technical solution adopted by the present invention is that a kind of yield strength 700MPa grade high ductility hot rolled steel plate, chemical component
Weight percent are as follows: C:0.06~0.10%, Si≤0.10%, Mn:1.20~1.80%, P≤0.012%, S≤0.006%,
N≤0.0040%, Al:0.015~0.040%, Mo:0.10~0.30%, Ti:0.06~0.12%, surplus are iron and can not
It avoids being mingled with.
The metallographic structure of yield strength 700MPa grade high ductility hot rolled steel plate of the present invention is fine grain ferrite and minute quantity
Pearlite, ferritic grain size is 10~13 grades in the tissue, the upper yield strength of 1.5~14.0mm thickness hot rolled steel plate
ReH>=700MPa, tensile strength Rm>=750MPa, elongation after fracture A >=18%, -40 DEG C of impact toughness value Akv >=120J, 180 ° curved
Song test, d=a are qualified.
The chemical component of yield strength 700MPa grade high ductility hot rolled steel plate of the present invention limits within the above range
The reasons why it is as follows:
Carbon: carbon content can form more coarse brittle carbonization to the advantageous but excessively high carbon content of intensity is improved in steel
Composition granule, unfavorable to plasticity and toughness, carbon content is excessively high can also be unfavorable to bending property in steel plate central segregation band, while mistake
High carbon content increases welding carbon equivalent, is unfavorable for welding processing.And carbon content is too low has to add a large amount of alloy to mention
High intensity, higher cost, the C content that the present invention is set is 0.06~0.10%.
Silicon: silicon, which is solid-solubilized in steel matrix, apparent strengthening effect, but silicone content is excessively high to steel plate plasticity and toughness
It is unfavorable, while the serious red iron sheet of the rust for being difficult to remove can be formed in hot rolling plate surface, it influences at product appearance and sequent surface
Reason.The present invention limits Si≤0.10%.
Manganese: on the one hand manganese can play the role of solution strengthening, while material harden ability can be improved, and be to improve the strength of materials
One of important element, while the area γ can be expanded, γ → α transition temperature is reduced, rolling mill practice window is expanded.But Mn content is high, holds
It is also easy to produce and is segregated and can reduce toughness of material, deteriorate performance, also will increase carbon equivalent, be unfavorable for welding, further increase alloy
Cost.The present invention limits Mn content as 1.20~1.80%.
Sulphur and phosphorus: sulphur and P elements are excessively high to adversely affect to toughness of material and plasticity.For this purpose, present invention restriction S≤
0.006%, P≤0.012%.
Aluminium: the effect of aluminium in the present invention is to play the role of deoxidation, and aluminium is strong oxidizing property formation element, He Gangzhong oxygen shape
At Al2O3It is removed in steel-making.Aluminium is excessively high to will form excessive Al2O3It is mingled with, and continuous casting is to be easy blocking to pour water filling
Mouthful.The present invention limits Al content as 0.015~0.040%.
Molybdenum: molybdenum is main alloy element of the invention, and molybdenum can be solid-solution in ferrite in steel, plays solution strengthening work
With, can also with carbon formed carbide, play precipitation strength effect, improve the intensity of steel.Furthermore molybdenum dramatically increases the through hardening of steel
Property and hardenability, refinement microstructure, and the toughness of steel can be significantly improved.The present invention limits Mo content as 0.10~0.30%.
Titanium: titanium is the important microalloy element of the present invention, and titanium forms TiN precipitated phase at high temperature and effectively refines austenite crystal
Grain forms TiC precipitated phase in low temperature, becomes more readily available tiny, disperse precipitated phase, can effectively improve intensity, seldom
The Ti of amount can obtain apparent strengthening effect.Ti additional amount is excessive, unfavorable to the impact flexibility of steel plate, especially easy in bending
Generate cracking.The present invention limits Ti content as 0.06~0.12%.
Nitrogen: nitrogen content it is excessively high can severe exacerbation material plasticity and toughness, especially for Ti micro-alloyed high strength steel, by
The TiN for being combined production larger size at high temperature with Ti in N, on the one hand has an impact the toughness of material, on the other hand can drop
Low steel grade produces the effective titanium content of tiny TiC in conjunction with C, so as to cause strength reduction.In view of N to the adverse effect of toughness,
The present invention limits N≤0.0040%.
A kind of manufacturing method of yield strength 700MPa grade high ductility hot rolled steel plate, this method comprises:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the weight percent of the ladle chemistry are as follows: and C:0.06~
0.10%, Si≤0.10%, Mn:1.20~1.80%, P≤0.012%, S≤0.006%, N≤0.0040%, Al:0.015
~0.040%, Mo:0.10~0.30%, Ti:0.06~0.12%, surplus are iron and are unavoidably mingled with；
Continuous casting steel billet carries out hot rolling after heating 150~240min, the hot rolling is rolled for two-part in 1230~1270 DEG C
Technique processed, roughing are 6 passage tandem rollings, are rolled more than austenite recrystallization temperature, and roughing end temp is 1050~1100 DEG C；
Workpiece thickness is 34~55mm, and finish rolling is 7 passage tandem rollings, and entry temperature at finishing is 1020~1060 DEG C, and finish rolling terminates temperature
It is 810~880 DEG C；After finish rolling, control steel plate thickness is 1.5~14.0mm, and section cooling is cooling using leading portion, section cooling speed
Degree is 50~100 DEG C/s, and coiling temperature batches to obtain coils of hot-rolled steel when being 520~600 DEG C.
The reasons why hot rolling technology system that the present invention takes, is as follows:
1, the setting of continuous casting steel billet heating temperature and heating time
Being set at for continuous casting steel billet acid extraction guarantees the molten of the particles such as TiN, TiC coarse in continuous casting billet
Solution, since the particles such as TiN, TiC can be precipitated in continuous casting steel billet cooling procedure there are a certain amount of Ti.During heating of plate blank, need
The particles such as coarse TiN, TiC are sufficiently dissolved, guarantee that sufficient amount of, disperse can be precipitated in the cooling procedure after rolling
, the particles such as tiny TiC, effectively play the precipitating reinforcing effect of Ti, therefore heating temperature is non-for technical solution of the present invention
Often important, temperature is too low or heating time is too short, and the particles such as original coarse TiN, TiC cannot sufficiently dissolve in continuous casting steel billet,
And temperature is excessively high, heating time is too long, and slab original structure is coarse, serious plus surface oxidation decarburization, and it is final to be unfavorable for steel plate
Performance and surface quality, while also consuming the energy.The present invention sets continuous casting steel billet heating temperature as 1240~1270 DEG C, when heating
Between be 150~240min.
2, roughing end temp is set
Rolling process of rough rolling control rolls more than austenite recrystallization temperature, it is ensured that obtains uniformly tiny austenite crystal
Grain.Therefore the present invention sets roughing end temp as 1050~1100 DEG C.
3, workpiece thickness and entry temperature at finishing setting
In order to obtain good impact flexibility, particularly with thickness >=8mm hot continuous-milling steel plate, need to control the finish rolling stage
Effective reduction ratio.Effective reduction ratio is the finish rolling stage reduction ratio deformed in austenite Unhydrated cement temperature range to occur,
It is related with finish rolling entrance workpiece thickness and temperature.Therefore the present invention sets workpiece thickness as 34~55mm, finish rolling entrance
Temperature is 1020~1060 DEG C.
4, finish rolling terminates temperature setting
Finishing temperature acts on of both being set with, and is on the one hand rolled by austenite Unhydrated cement, obtaining inside has
The flat austenite grain of Zona transformans is transformed into tiny ferrite crystal grain in subsequent laminar cooling process, plays thin
The effect that crystalline substance is strengthened.On the other hand, final rolling temperature setting will also prevent the particles such as TiC from largely analysing in deformed austenite in advance
Out, it causes that reduction is precipitated again in ferrite, the effect of precipitation strength can not be played.In order to guarantee think gauge low-temperature flexibility, this
Invention setting finish rolling finishing temperature is related to hot continuous-milling steel plate final finished thickness,.Therefore present invention setting finish rolling terminates temperature
It is 810 DEG C -880 DEG C.
5, section cooling speed is set
Section cooling speed after the finish rolling that the present invention is set is very crucial, inhibits ferrite using fast cooling velocity
Crystal grain grow up with TiC hot stage precipitation.It is quickly cooled down so that the interior precipitation of ferrite at a lower temperature is tiny more
The particles such as scattered TiC are possibly realized.Cooling velocity is excessively slow, can not inhibit in advance precipitation of the TiC in high temperature deformation austenite；It is cold
Too fast, very big influence can be also brought on plate shape to unfavorable to steel plate toughness.Section cooling of the present invention is cold using leading portion
But mode, cooling velocity are 50~100 DEG C/s.
6, coiling temperature is set
Coiling temperature mainly influences the tissue and performance of strip.Coiling temperature is too high or too low, is all unfavorable for the particles such as TiC
Precipitation, cannot preferably play precipitating reinforcing effect.Comprehensively consider, the present invention sets hot-rolling coiling temperature as 520~600
℃。
The metallographic structure of the yield strength 700MPa grade high ductility hot rolled steel plate of the method for the present invention production is fine grain granulated iron element
Body and minimal amount of pearlite, ferritic grain size is 10~13 grades in the tissue, 1.5mm~14.0mm thickness hot rolled steel plate
Upper yield strength ReH>=700MPa, tensile strength Rm>=750MPa, elongation after fracture A >=18%, -40 DEG C of impact toughness value Akv
>=120J, 180 ° of bend tests, d=a are qualified.
The present invention has following good effect compared with prior art: 1, the present invention uses low-carbon, high Mn, Mo, Ti microalloy
Meter is set up in chemical conversion separately, is not added with the alloying elements such as high Cr, Ni, Nb, V, B, and the steel plate of acquisition has lower carbon equivalent；According to difference
Workpiece thickness, finish to gauge and the coiling temperature of level of thickness design, make full use of controlled rolling control technique, play refined crystalline strengthening and analysis
Invigoration effect out；The hot rolled steel plate of production has well processed and welding performance, and manufacturing cost is low.2, the surrender that the present invention obtains
Intensity 700MPa level hot rolled steel plate has excellent impact flexibility, -40 DEG C of impact toughness values of 1.5~14.0mm thickness hot rolled steel plate
Akv≥120J；180 ° of bend tests, d=a are qualified.
Detailed description of the invention
Attached drawing 1 is the metallographic structure photo of 4 hot rolled steel plate of the embodiment of the present invention.
Specific embodiment
Below with reference to Examples 1 to 5, the present invention will be further described, as shown in Table 1 to Table 3.
Table 1 is the chemical component (by weight percentage) of steel of the embodiment of the present invention, and surplus is iron and inevitable impurity.
The chemical component of 1 steel of the embodiment of the present invention of table, unit: weight percent.
It is blown at Ar processing and RH furnace progress vacuum circulation degassing by converter melting, and through LF ladle refining furnace refining procedure
Reason and trimming, obtain the molten steel for meeting component requirements, obtain continuous casting steel billet by continuous casting.Continuous casting steel billet is with a thickness of 210
~230mm, width are 900~1600mm, and length is 8000~11700mm (long base) or 4700~5300mm (short base).
The scale slab of STEELMAKING PRODUCTION, which is sent to heating furnace, to be heated, and is sent after de-scaling of coming out of the stove to hot tandem and is rolled
System.By roughing and finish rolling Continuous mill train controlled rolling, being batched after section cooling, section cooling takes leading portion cooling,
Output qualification coils of hot-rolled steel.Hot rolled steel plate with a thickness of 1.5~14.0mm.Hot rolling technology control parameter is shown in Table 2.
2 hot rolling technology control parameter of the embodiment of the present invention of table
Using hot rolled steel plate obtained by the above method, referring to Fig. 1, the metallographic structure of hot rolled steel plate be fine grain ferrite and
Minimal amount of pearlite, ferritic grain size is 10~13 grades in the tissue, and the upper of 1.5~14.0mm thickness hot rolled steel plate is bent
Take intensity ReH>=700MPa, tensile strength Rm>=750MPa, elongation after fracture A >=18%, -40 DEG C of impact toughness value Akv >=120J,
180 ° of bend tests, d=a are qualified.
The hot rolled steel plate that the present invention obtains is sampled, stretching, bend test take lateral sample, and impact test takes longitudinal direction
Sample carries out tension test according to " GB/T228.1-2010 metal material stretching test part 1: room temperature test method "；It presses
According to " GB/T 232-2010 " bend test of metal materials method " carries out bend test；According to " GB/T 229-2007 metal material
Charpy pendulum impact test method " impact test is carried out, mechanical property is shown in Table 3.
The mechanical property of 3 hot rolled steel plate of the embodiment of the present invention of table
Seen from table 3, the hot rolled steel plate that the present invention obtains has the advantages that high-intensitive, high tenacity, while having good cold
Roll forming.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (4)
1. a kind of yield strength 700MPa grade high ductility hot rolled steel plate, chemical component weight percentage are as follows: C:0.06~
0.10%, Si≤0.10%, Mn:1.20~1.80%, P≤0.012%, S≤0.006%, N≤0.0040%, Al:0.015
~0.040%, Mo:0.10~0.30%, Ti:0.06~0.12%, surplus are iron and are unavoidably mingled with；The gold of hot rolled steel plate
Phase constitution is fine grain ferrite and minimal amount of pearlite, and ferritic grain size is 10~13 grades in the tissue.
2. yield strength 700MPa grade high ductility hot rolled steel plate as described in claim 1, characterized in that 1.5mm~14.0mm
The upper yield strength R of thick hot rolled steel plateeH>=700MPa, tensile strength Rm>=750MPa, elongation after fracture A >=18%, -40 DEG C of punchings
Hit work value Akv >=120J.
3. a kind of manufacturing method of yield strength 700MPa grade high ductility hot rolled steel plate, characterized in that this method comprises:
Molten steel obtains continuous casting steel billet through continuous casting, wherein the weight percent of the ladle chemistry are as follows: C:0.06~0.10%,
Si≤0.10%, Mn:1.20~1.80%, P≤0.012%, S≤0.006%, N≤0.0040%, Al:0.015~
0.040%, Mo:0.10~0.30%, Ti:0.06~0.12%, surplus are iron and are unavoidably mingled with；
Continuous casting steel billet carries out hot rolling after heating 150~240min, the hot rolling is that two-part rolls work in 1230~1270 DEG C
Skill, roughing are 6 passage tandem rollings, are rolled more than austenite recrystallization temperature, and roughing end temp is 1050~1100 DEG C；It is intermediate
For base with a thickness of 34~55mm, finish rolling is 7 passage tandem rollings, is rolled in austenite non-recrystallization temperature area, entry temperature at finishing is
1020~1060 DEG C, it is 810~880 DEG C that finish rolling, which terminates temperature,；After finish rolling, section cooling is cooling using leading portion, section cooling speed
Degree is 50~100 DEG C/s, and coiling temperature batches to obtain coils of hot-rolled steel when being 520~600 DEG C.
4. the manufacturing method of yield strength 700MPa grade high ductility hot rolled steel plate as claimed in claim 3, characterized in that finish rolling
Afterwards, control steel plate thickness is 1.5~14.0mm.
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| CN201710861264.XA CN109536846B (en) | 2017-09-21 | 2017-09-21 | High-toughness hot-rolled steel plate with yield strength of 700MPa and manufacturing method thereof |
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| CN110983180A (en) * | 2019-12-16 | 2020-04-10 | 首钢集团有限公司 | Hot-rolled high-strength steel and preparation method and application thereof |
| CN111187983A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Special steel for 750 MPa-grade special container and preparation process thereof |
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| CN111187983A (en) * | 2020-02-17 | 2020-05-22 | 本钢板材股份有限公司 | Special steel for 750 MPa-grade special container and preparation process thereof |
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| CN115505836A (en) * | 2021-06-23 | 2022-12-23 | 上海梅山钢铁股份有限公司 | 500 MPa-grade yield strength hot-rolled steel plate for automobile chassis suspension |
| CN114703426A (en) * | 2022-04-08 | 2022-07-05 | 马鞍山钢铁股份有限公司 | Zinc-aluminum-magnesium coating high-strength steel plate and method for efficiently producing high-strength steel plates with different strength levels |
| CN115595498A (en) * | 2022-05-25 | 2023-01-13 | 昆明理工大学（Cn） | Ti-Zr-Mo composite microalloyed 800 MPa-grade high-strength high-toughness steel plate and preparation method thereof |
| CN115595498B (en) * | 2022-05-25 | 2023-06-16 | 昆明理工大学 | Ti-Zr-Mo composite microalloyed 800 MPa-level high-strength high-toughness steel plate and preparation method thereof |
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