CN106282800A - A kind of surrender 345MPa level refractory steel plates and production method thereof - Google Patents
A kind of surrender 345MPa level refractory steel plates and production method thereof Download PDFInfo
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- CN106282800A CN106282800A CN201610807258.1A CN201610807258A CN106282800A CN 106282800 A CN106282800 A CN 106282800A CN 201610807258 A CN201610807258 A CN 201610807258A CN 106282800 A CN106282800 A CN 106282800A
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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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
-
- 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
-
- 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
-
- 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
- C21D2211/002—Bainite
-
- 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
Abstract
The invention discloses a kind of surrender 345MPa level refractory steel plates and production method thereof, it includes heating, rolling and tempering process；Described rolling process uses recrystallization zone+Unhydrated cement two benches controlled rolling process；The weight percentage of described steel plate chemical composition is: C 0.10～0.12%, Si 0.20～0.40%, Mn 1.43～1.53%, P≤0.008%, S≤0.003%, Mo 0.15～0.25%, Nb 0.020～0.030%, Al 0.020～0.050%, V 0.020～0.030%, surplus is Fe and inevitable impurity.The Design of Chemical Composition of this method light plate uses low C, it is ensured that the weldability that steel plate is good；Use the design of Nb, V microalloying, be aided with the alloying elements such as Mo and guarantee armor plate strength, toughness coupling and resistance to elevated temperatures；TMCP+ tempering process is used to obtain bainite, ferritic complex tissue.The inventive method produces steel plate by controlled rolling and controlled cooling+tempering process, and gained surrender 345MPa level TMCP+ tempering type refractory steel plates has a low carbon equivalent and crack-sensitivity type index, low yield strength ratio, low temperature rush the features such as good-toughness, weldability be good.
Description
Technical field
The present invention relates to a kind of refractory steel plates and production method thereof, especially a kind of surrender 345MPa level refractory steel plates and
Production method.
Background technology
Along with heavy construction, the skyscraper of domestic and international steel construction continue to bring out, the anti-ignition technique of steel construction sets in the world
Meter attracts widespread attention, construction steel structure fire prevention technological design become ensure building safety requisite measure it
One.When common building steel is heated, its intensity and bearing capacity reduce rapidly, it is impossible to meet design requirement.General in order to improve employing
The ability of the building opposing fire that logical construction(al)steel is built, it is necessary to take spray refractory coating or cover the measures such as PLASTIC LAMINATED,
And use the refractory steel can be thinning or save refractory coating or PLASTIC LAMINATED, and can guarantee that steel at high temperature keep higher intensity water
Flat, also can shortening production cycle, alleviate structural quality, increase the safety of building, reduce construction cost, there is significant warp
Ji benefit and social benefit.
Refractory steel requires to have good high-temperature behavior, but it is different from again the heat resisting steel being at high temperature on active service for a long time, resistance to
Hot steel requires have good elevated temperature strength and high-temperature stability, typically uses high-alloy steel.And refractory steel is to hold at normal temperatures
Carry, simply require can keep under (usually 1～3h) the in short-term hot conditions running into fire higher yield strength,
Thus belong to low-alloy structural steel.Japan's steel construction safe design specification specifies: 2/3 phase of steel yield strength under room temperature
When in the long-term allowable stress value of this material, when a fire, if fire-resistant yield of steel still can keep this value, building
Thing would not collapse.Therefore, with reference to the regulation in Japanese architecture standard, it is desirable to its yield strength is not under certain high temperature for refractory steel
Less than room-temperature yield strength 2/3.For improving the shock resistance of steel construction, it is always desirable to improve steel and absorb seismic energy as far as possible
Ability, if the yield tensile ratio of steel is higher, occurs to produce stress raisers and local large deformation during earthquake, and now steel construction is only
Less energy, the energy that therefore low yield strength ratio absorbs when being conducive to improving building structure earthquake can be absorbed；Typically require antidetonation
Yield tensile ratio≤0.8 of refractory steel.It addition, the yield strength fluctuation range controlling construction(al)steel is the most extremely important, work as yield strength
When fluctuating less, steel construction is a kind of overall failure mechanism, and the plastic deformation ability of its entirety is the highest, excellent earthquake resistance, because of
This, for Aseismic Design, it is desirable to the steel using narrow surrender interval are also the most necessary.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of surrender 345MPa level refractory steel plates of good performance；The present invention
Additionally provide a kind of production method surrendering 345MPa level refractory steel plates.
For solving above-mentioned technical problem, the weight percentage of chemical composition of the present invention is: C 0.10～0.12%, Si
0.20～0.40%, Mn 1.43～1.53%, P≤0.008%, S≤0.003%, Mo 0.15～0.25%, Nb 0.020～
0.030%, Al 0.020～0.050%, V 0.020～0.030%, surplus is Fe and inevitable impurity.
Steel plate of the present invention be organized as bainite and ferritic complex tissue.
The inventive method includes heating, rolling and tempering process；Described rolling process uses recrystallization zone+non-recrystallization
District's two benches controlled rolling process；The weight percentage of described steel plate chemical composition is described above.
Rolling process described in the inventive method: first stage rolling temperature is 1000～1100 DEG C, single pass drafts is
10～20%, accumulative reduction ratio is 30～50%；Second stage rolling temperature is 840～910 DEG C, accumulative reduction ratio be 30～
50%；ACC water-cooled is carried out after rolling.The coolant-temperature gage that enters of described ACC water-cooled is 760～780 DEG C, red temperature 600～650 DEG C.
Tempering process described in the inventive method: heating-up temperature 350～400 DEG C, temperature retention time coefficient 1min/mm.
Heating process described in the inventive method: the maximum heating temperature 1240 of steel billet～1250 DEG C, soaking temperature 1200～
1220 DEG C, soaking zone time inside furnace >=1h.Total heat time heating time >=1min/mm steel billet thickness.
The mentality of designing of the present invention and method is as follows: carbon, manganese solution strengthening；Add a small amount of Nb, V, Mo crystal grain thinning, its
Carbonitride plays dispersion-strengthened action；By follow-up cooling controlling and rolling controlling process accurately, steel plate is made to have good mechanical property.
Wherein, the effect in the present invention of each component and content is:
The surrender of steel, tensile strength, welding performance are made a significant impact by C: carbon.Carbon can significantly improve steel plate by gap solid solution
Intensity, but carbon content is too high, can affect again welding performance and the toughness of steel.
Si: as reducing agent and deoxidizer in steelmaking process, Si also can play solution strengthening effect simultaneously, but exceedes
When 0.5%, the toughness of steel can be caused to decline, reduce the welding performance of steel.
Mn: manganese is with low cost, can increase the toughness of steel, intensity and hardness, improves the quenching degree of steel, and the heat improving steel adds
Work performance；Manganese amount is too high, center segregation easily occurs for big thickness steel plate.
P, S: in the ordinary course of things, p and s is all harmful element in steel, increases the fragility of steel.Phosphorus makes welding performance become
Bad, reduce plasticity；Sulfur reduces ductility and the toughness of steel, causes crackle when rolling；Therefore should reduce p and s at steel as far as possible
In content.
Al: aluminum is deoxidizer conventional in steel.Steel adds a small amount of aluminum, can crystal grain thinning, improve impact flexibility.Aluminum is also
There is non-oxidizability and corrosion resistance, too high, affect the hot-working character of steel, welding performance and machinability.
The crystal grain being added to promote steel rolling microscopic structure of Nb: niobium refines, and can improve intensity and toughness, niobium simultaneously
By suppression austenite recrystallization, effective refinement microstructure in During Controlled Rolling, and precipitation strength matrix can be passed through.Welding
During, the segregation of niobium atom and separate out the roughening of austenite crystal when can hinder heating, and compared after ensureing welding
Tiny heat affected area tissue, improving welding property.
The Main Function of V:V is the alternate precipitation in γ-α transition process and the precipitation strength in ferrite.
The Main Function of Mo:Mo improves high tempering stability, significantly improves the elevated temperature strength of steel.
Use and have the beneficial effects that produced by technique scheme: Design of Chemical Composition of the present invention uses low C, it is ensured that steel
The weldability that plate is good；Use Nb, V microalloying design, be aided with the alloying elements such as Mo, it is ensured that armor plate strength, toughness coupling and
Resistance to elevated temperatures；The present invention has good fire resistance, is organized as bainite, ferritic complex tissue, has antidetonation effect
Feature the best, resistant to elevated temperatures；The present invention 600 DEG C high >=230MPa that draws, yield strength >=345MPa, tensile strength >=490MPa,
Yield tensile ratio≤0.83,0 DEG C of ballistic work >=34J, steel plate maximum gauge can reach 20mm.
The Design of Chemical Composition of the inventive method light plate uses low C, it is ensured that the weldability that steel plate is good；Use Nb, V micro-
Alloying Design, is aided with the alloying elements such as Mo and guarantees armor plate strength, toughness coupling and resistance to elevated temperatures；Use TMCP+ Temperer
Skill obtains bainite, ferritic complex tissue.The inventive method produces steel plate by controlled rolling and controlled cooling+tempering process, and gained is bent
Take 345MPa level TMCP+ tempering type refractory steel plates (Q345FRC) and there is good weldability, low weld crack sensitivity coefficient
(Pcm) 0.19～0.21%；Yield strength is 400～460MPa, and tensile strength is between 570～590MPa, and 600 DEG C of high temperature are bent
Take 250～270MPa, 0 DEG C of ballistic work >=150J；Steel plate maximum gauge can reach 20mm；There is bainite, ferritic compound
Tissue.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the micro-organization chart of the steel plate of embodiment 1；
Fig. 2 is the micro-organization chart of the steel plate of embodiment 2；
Fig. 3 is the micro-organization chart of the steel plate of embodiment 3；
Fig. 4 is the micro-organization chart of the steel plate of embodiment 4.
Detailed description of the invention
This surrender 345MPa level refractory steel plates uses following method to produce:
(1) smelting procedure: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, feeds Al line during refine；Liquid steel temperature reaches
Or VD stove Fruit storage is proceeded to more than 1540 ± 10 DEG C, add CaSi block >=100kg or Fe-Ca line before Fruit storage
400～450m change inclusion morphology, the vacuum≤66.6Pa of Fruit storage, vacuum retention time >=20min.Tapping
The weight percentage of ladle chemistry is: C 0.10～0.12%, Si 0.20～0.40%, Mn 1.43～1.53%, P≤
0.008%, S≤0.003%, Mo 0.15～0.25%, Nb 0.020～0.030%, Al 0.020～0.050%, V 0.020～
0.030%, surplus is Fe and inevitable impurity.
(2) continuous casting working procedure: use 200mm thickness continuous casting billet to become a useful person.
(3) heating process: the maximum heating temperature 1240 of steel billet～1250 DEG C, soaking temperature 1200～1220 DEG C, always add
Heat time >=1min/mm steel billet thickness, soaking zone time inside furnace >=60min.
(4) rolling process: use recrystallization zone+Unhydrated cement two benches controlled rolling process to roll, obtain semi-finished product
Steel plate；First stage rolling temperature is 1000～1100 DEG C, and this stage single pass drafts is 10～20%, and accumulative reduction ratio is
30～50%；Second stage rolling temperature is 840～910 DEG C, and accumulative reduction ratio is 30～50%；Carry out ACC water-cooled after rolling, enter
Coolant-temperature gage 760～780 DEG C, red temperature 600～650 DEG C.
(5) tempering process: semi-finished product steel plate is tempered；Heating-up temperature 350～400 DEG C, temperature retention time coefficient 1min/
mm；I.e. can get maximum gauge and can reach the refractory steel plates of 20mm.
Embodiment 1: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature reaches 1540 DEG C and proceeds to VD stove
Fruit storage, adds CaSi block 100kg before VD；Vacuum 66.6Pa of Fruit storage, the vacuum retention time
20min；The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: maximum heating temperature 1250 DEG C, soaking temperature 1220 DEG C, total heat time heating time 204min, soaking zone is at stove
Time 1h.
(4) rolling: first stage rolling temperature is 1030 DEG C, and single pass drafts is 20%, and accumulative reduction ratio is 50%；
Second stage rolling temperature is 840 DEG C, and accumulative reduction ratio is 30%；Carry out ACC water-cooled after rolling, enter coolant-temperature gage 780 DEG C, return red temperature
Spend 650 DEG C.
(5) tempering: heating-up temperature 381 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 10mm thickness refractory steel plates: yield strength 422MPa, tensile strength 572MPa,
Yield tensile ratio 0.73,600 DEG C high are drawn 289MPa, 0 DEG C of average 210J of ballistic work；Macrograph is shown in Fig. 1, and it is organized as seen from Figure 1
Bainite and ferritic complex tissue.
Embodiment 2: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature 1550 DEG C proceeds to VD stove vacuum
Degassing processes, and adds Fe-Ca line 400m and change inclusion morphology before VD；Vacuum 66Pa of Fruit storage, vacuum keeps
Time 24min；The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: billet heating temperature is the highest 1245 DEG C, soaking temperature 1218 DEG C, total heat time heating time 210min, soaking zone
Time inside furnace 61min.
(4) rolling: first stage rolling temperature is 1100 DEG C, and single pass drafts is 10%, and accumulative reduction ratio is 30%；
Second stage rolling temperature is 910 DEG C, and accumulative reduction ratio is 30%, carries out ACC water-cooled after rolling, and enters coolant-temperature gage 780 DEG C, returns red temperature
Spend 600 DEG C.
(5) tempering: heating-up temperature 389 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 10mm thickness refractory steel plates: yield strength 410MPa, tensile strength 571MPa,
Yield tensile ratio 0.72,600 DEG C high are drawn 280MPa, 0 DEG C of average 100J of ballistic work；Macrograph is shown in Fig. 2, and it is organized as seen from Figure 2
Bainite and ferritic complex tissue.
Embodiment 3: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature 1530 DEG C proceeds to VD stove vacuum
Degassing processes, and adds CaSi block 110kg and change inclusion morphology before VD；Vacuum 60Pa of Fruit storage, vacuum keeps
Time 25min；The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: maximum heating temperature 1240 DEG C, soaking temperature 1220 DEG C, total heat time heating time 220min, soaking zone is at stove
Time 1.5h.
(4) rolling: first stage rolling temperature is 1050 DEG C, and single pass drafts is 15%, and accumulative reduction ratio is 38%；
Second stage rolling temperature is 880 DEG C, and accumulative reduction ratio is 40%；Carry out ACC water-cooled after rolling, enter coolant-temperature gage 780 DEG C, return red temperature
Spend 650 DEG C.
(5) tempering: heating-up temperature 400 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 20mm thickness refractory steel plates: yield strength 434 MPa, tensile strength 582
MPa, yield tensile ratio 0.75,600 DEG C high are drawn 266MPa, 0 DEG C of average 123J of ballistic work；Macrograph is shown in Fig. 3, as seen from Figure 3 its group
It is woven to bainite and ferritic complex tissue.
Embodiment 4: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature 1535 DEG C proceeds to VD stove vacuum
Degassing processes, and adds Fe-Ca line 450m and change inclusion morphology before VD；Vacuum 62Pa of Fruit storage, vacuum keeps
Time 26min；The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: maximum heating temperature 1250 DEG C, soaking temperature 1220 DEG C, total heat time heating time 220min, soaking zone is at stove
Time 1.2h.
(4) rolling: first stage rolling temperature is 1000 DEG C, and this stage single pass drafts is 18%, and accumulative reduction ratio is
40%；Second stage rolling temperature is 900 DEG C, and accumulative reduction ratio is 42%, carries out ACC water-cooled after rolling, and enters coolant-temperature gage 770 DEG C,
Red temperature 650 DEG C.
(5) tempering: heating-up temperature 350 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 15mm thickness refractory steel plates: yield strength 455MPa, tensile strength
589MPa, yield tensile ratio 0.77,600 DEG C high are drawn 260MPa, 0 DEG C of average 132J of ballistic work；Macrograph is shown in Fig. 4, as seen from Figure 4 its
It is organized as bainite and ferritic complex tissue.
Embodiment 5: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature reaches 1545 DEG C and proceeds to VD stove
Fruit storage, adds CaSi block 120kg before VD；Vacuum 65Pa of Fruit storage, vacuum retention time 30min；
The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: maximum heating temperature 1248 DEG C, soaking temperature 1220 DEG C, total heat time heating time 200min, soaking zone is at stove
Time 65min.
(4) rolling: first stage rolling temperature is 1080 DEG C, and single pass drafts is 12%, and accumulative reduction ratio is 32%；
Second stage rolling temperature is 860 DEG C, and accumulative reduction ratio is 50%；Carry out ACC water-cooled after rolling, enter coolant-temperature gage 780 DEG C, return red temperature
Spend 620 DEG C.
(5) tempering: heating-up temperature 370 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 15mm thickness refractory steel plates: yield strength 402MPa, tensile strength 559MPa,
Yield tensile ratio 0.72,600 DEG C high are drawn 281MPa, 0 DEG C of average 223J of ballistic work.
Embodiment 6: the concrete production technology of this surrender 345MPa level refractory steel plates is as described below.
(1) smelt: molten steel, first through electric furnace smelting, sends into LF refining furnace refine, and liquid steel temperature reaches 1540 DEG C and proceeds to VD stove
Fruit storage, adds Fe-Ca line 420m before VD；Vacuum 64Pa of Fruit storage, vacuum retention time 25min；
The weight percentage of tapping ladle chemistry is shown in Table 1.
(2) continuous casting: be casting continuously to form the continuous casting billet of 200mm thickness.
(3) heating: maximum heating temperature 1243 DEG C, soaking temperature 1220 DEG C, total heat time heating time 208min, soaking zone is at stove
Time 80min.
(4) rolling: first stage rolling temperature is 1040 DEG C, and single pass drafts is 14%, and accumulative reduction ratio is 45%；
Second stage rolling temperature is 870 DEG C, and accumulative reduction ratio is 36%；Carry out ACC water-cooled after rolling, enter coolant-temperature gage 760 DEG C, return red temperature
Spend 630 DEG C.
(5) tempering: heating-up temperature 360 DEG C, temperature retention time coefficient 1min/mm.
The mechanical property of the present embodiment gained 20mm thickness refractory steel plates: yield strength 431MPa, tensile strength 569MPa,
Yield tensile ratio 0.76,600 DEG C high are drawn 299MPa, 0 DEG C of average 231J of ballistic work.
Table 1: the weight percentage (wt%) of each embodiment light plate chemical composition
In table 1, the surplus of chemical composition is Fe and inevitable impurity.
From above-described embodiment, the surrender 345MPa level TMCP+ tempering type refractory steel plates steel plate that this method produces has
Low carbon equivalent and crack-sensitivity type index, low yield strength ratio, low temperature rush the features such as good-toughness, weldability be good.
Claims (8)
1. one kind surrender 345MPa level refractory steel plates, it is characterised in that the weight percentage of its chemical composition is: C 0.10～
0.12%, Si 0.20～0.40%, Mn 1.43～1.53%, P≤0.008%, S≤0.003%, Mo 0.15～0.25%, Nb
0.020～0.030%, Al 0.020～0.050%, V 0.020～0.030%, surplus is Fe and inevitable impurity.
A kind of surrender 345MPa level refractory steel plates the most according to claim 1, it is characterised in that: being organized as of described steel plate
Bainite and ferritic complex tissue.
3. the production method surrendering 345MPa level refractory steel plates, it is characterised in that: it includes heating, rolling and Temperer
Sequence；Described rolling process uses recrystallization zone+Unhydrated cement two benches controlled rolling process；The weight of described steel plate chemical composition
Percentage composition is: C 0.10～0.12%, Si 0.20～0.40%, Mn 1.43～1.53%, P≤0.008%, S≤0.003%, Mo
0.15～0.25%, Nb 0.020～0.030%, Al 0.020～0.050%, V 0.020～0.030%, surplus is Fe and can not
The impurity avoided.
A kind of production method surrendering 345MPa level refractory steel plates the most according to claim 3, it is characterised in that described in roll
Operation processed: first stage rolling temperature is 1000～1100 DEG C, single pass drafts is 10～20%, accumulative reduction ratio be 30～
50%；Second stage rolling temperature is 840～910 DEG C, and accumulative reduction ratio is 30～50%；ACC water-cooled is carried out after rolling.
A kind of production method surrendering 345MPa level refractory steel plates the most according to claim 4, it is characterised in that: described
The coolant-temperature gage that enters of ACC water-cooled is 760～780 DEG C, red temperature 600～650 DEG C.
A kind of production method surrendering 345MPa level refractory steel plates the most according to claim 3, it is characterised in that described time
Firer's sequence: heating-up temperature 350～400 DEG C, temperature retention time coefficient 1min/mm.
7. according to a kind of production method surrendering 345MPa level refractory steel plates described in claim 3-6 any one, its feature
It is, described heating process: the maximum heating temperature 1240 of steel billet～1250 DEG C, soaking temperature 1200～1220 DEG C, soaking zone
Time inside furnace >=1h.
A kind of production method surrendering 345MPa level refractory steel plates the most according to claim 7, it is characterised in that: always heat
Time >=1min/m steel billet thickness.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107739992A (en) * | 2017-09-29 | 2018-02-27 | 舞阳钢铁有限责任公司 | Normalizing type surrenders 345MPa levels weather-resistant steel plate and its production method |
| CN108486495A (en) * | 2018-06-01 | 2018-09-04 | 钢铁研究总院 | A kind of high-strength fireproof steel and preparation method thereof for steel building |
| CN108728730A (en) * | 2017-04-24 | 2018-11-02 | 鞍钢股份有限公司 | A kind of 315MPa high-performance building structures mild steel and its manufacturing method |
| CN109136740A (en) * | 2018-07-03 | 2019-01-04 | 舞阳钢铁有限责任公司 | Low cost 485MPa grades of pipe fitting steel plates of surrender and its production method |
| CN115323271A (en) * | 2022-07-31 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Refractory hot-rolled steel plate with 390 MPa-grade yield strength, low yield ratio and high low-temperature toughness and preparation method thereof |
| CN115572913A (en) * | 2022-09-08 | 2023-01-06 | 舞阳钢铁有限责任公司 | Fire-resistant high-strength steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108728730A (en) * | 2017-04-24 | 2018-11-02 | 鞍钢股份有限公司 | A kind of 315MPa high-performance building structures mild steel and its manufacturing method |
| CN107739992A (en) * | 2017-09-29 | 2018-02-27 | 舞阳钢铁有限责任公司 | Normalizing type surrenders 345MPa levels weather-resistant steel plate and its production method |
| CN108486495A (en) * | 2018-06-01 | 2018-09-04 | 钢铁研究总院 | A kind of high-strength fireproof steel and preparation method thereof for steel building |
| CN108486495B (en) * | 2018-06-01 | 2019-08-23 | 钢铁研究总院 | A kind of high-strength fireproof steel and preparation method thereof for steel building |
| CN109136740A (en) * | 2018-07-03 | 2019-01-04 | 舞阳钢铁有限责任公司 | Low cost 485MPa grades of pipe fitting steel plates of surrender and its production method |
| CN115323271A (en) * | 2022-07-31 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Refractory hot-rolled steel plate with 390 MPa-grade yield strength, low yield ratio and high low-temperature toughness and preparation method thereof |
| CN115323271B (en) * | 2022-07-31 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Low-yield-ratio high-low-temperature-toughness fire-resistant hot rolled steel plate with yield strength of 390MPa and preparation method thereof |
| CN115572913A (en) * | 2022-09-08 | 2023-01-06 | 舞阳钢铁有限责任公司 | Fire-resistant high-strength steel and production method thereof |
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| CN106282800B (en) | 2018-10-09 |
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