CN108239722B - A kind of the Weather-resistance bridge steel plate and its production method of yield strength >=420MPa - Google Patents
A kind of the Weather-resistance bridge steel plate and its production method of yield strength >=420MPa Download PDFInfo
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- CN108239722B CN108239722B CN201810173562.4A CN201810173562A CN108239722B CN 108239722 B CN108239722 B CN 108239722B CN 201810173562 A CN201810173562 A CN 201810173562A CN 108239722 B CN108239722 B CN 108239722B
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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
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
Abstract
The invention discloses Weather-resistance bridge steel plates of a kind of yield strength >=420MPa and preparation method thereof.The ingredient and weight percent content of steel be；C:0.06~0.09%, Si:0.25~0.40%, Mn:1.10~1.30%, P :≤0.015%, S :≤0.005%, Cu:0.25~0.40%, Cr:0.40~0.60%, Ni:0.30~0.40%, Nb:0.015~0.030%, Ti:0.010~0.030%, Al:0.020~0.045%, As :≤0.0050%, and CEV < 0.41% is controlled, remaining is Fe and is inevitably mingled with.The preparation method comprises the following steps: molten iron pretreatment → 120t converter smelting → LF refining → RH refining → sheet billet continuous casting → slab slow cooling → slab cleaning → reheating stove heating → de-scaling → roughing → finish rolling → acceleration water cooling → thermal straightening → steel plate mark → steel plate slow cooling → shearing → mark → storage.The present invention is designed with mentioned component and easily operated thermal deformation and cooling technique, and the corrosion resistance of steel plate, low-temperature impact toughness, fatigue behaviour and welding performance are performed to optimum level.
Description
Technical field
The invention belongs to technical field of micro-alloy steel production, it is related to a kind of yield strength >=420MPa high fatigue durability, easily
The Weather-resistance bridge steel plate and its production method of welding are that bridge construction industry is sent out towards large span, full welding, without coating direction
Exhibition, which improves, provides technical support.
Background technique
Bridge structure is exposed to the atmosphere, and there are serious corrosion.As steel structure bridge is to large span, all-welded structure
Develop with high parameter direction, the security reliability of bridge structure is required to be increasingly stringenter, thus plate quality is proposed more
High requirement, i.e., not requiring nothing more than it has high intensity to meet structure lightened requirement, but also should have excellent low temperature tough
Property, low yield strength ratio, weldability, fatigue resistance and corrosion resistance etc., required with meeting the safe and reliable, long-lived etc. of steel construction.Tradition
High-strength bridge steel not only impact flexibility, weldability, fatigability are poor, but also be not resistant to atmosphere, seawater corrosion；Weather-resistance bridge
With steel because it is at low cost with initial stage, life cycle cost is low, construction speed is fast, effect on environment is small, do not have an impact health and
The advantages that safety problem, has obtained broad development in foreign countries, and has become a new direction of bridge steel plate development.With China
Economic continuous development, highway in China put more effort with railway infrastructure investment, and bridge construction is as a part therein
It is developed rapidly, wide application market is brought to bridge steel plate.Weather-resistance bridge can meet China with steel and mention to steel bridge
The new demand of economical environment-protective and sustainable development out, it is desirable that caused again on bridge construction using the cry of weathering steel
The attention of bridge steel developer will certainly be widelyd popularize on steel structure bridge.In view of the need of bridge construction industry development
It wants, compared with the GB/T714-2015 version that it replaces in 714-2015 editions new standards of GB/T that China comes into effect on June 1st, 2016
Standard increases Weather-resistance bridge steel.The implementation of new standard will certainly accelerate popularization of the Weather-resistance bridge steel in Bridges in Our Country construction
Using.Relative to 2008 editions, new standard, which has the requirements such as low-temperature impact toughness, the carbon equivalent of steel plate, to be increased substantially, still
To influencing bridge structure using safe and the service life fatigue behaviour still without being distinctly claimed.
Look into new according to relevant documents and materials and published newest patented technology as a result, only following six is related at present
Patent, and equal unauthorized:
Chinese patent CN201610295605.7 " 485MPa grades of TMCP+ tempering Weather-resistance bridge steel plates and production method " is in
State patent CN200910312332.2 " a kind of Weather-resistance bridge high-strength steel plate and its production method " is limited by Wuyang steel
Responsible company's application.Compared with this application invention, V is added in the ingredient design of above-mentioned its involved steel plate of two patents
With Mo element, and be respectively adopted TMCP+ tempering with TMCP+ quenching+tempering technique, will definitely increase production cost；Meanwhile only
Refer to -23 DEG C of impact properties, impact flexibility situation did not referred under lower temperature, and was not directed to the fatigue behaviour of trial-production steel plate.
Chinese patent CN201710764809.5 " a kind of yield strength 420MPa grades of rare earth Weather-resistance bridge steel plates and its production
Method " and Chinese patent CN 201710763956.0 " a kind of yield strength 345MPa grades of rare earth Weather-resistance bridge steel plates and its production
Method " is filed an application by Baotou Iron and Steel (Group) Co., Ltd..Compared with this application invention, above-mentioned patent composition
Be added to Rare-Earth Ce element in design, will definitely increase production cost, and it is required to roll rear 10~15 DEG C/s of cooling rate larger, undoubtedly
Technique realizes difficulty and plate property fluctuation；It is applied for a patent lower than this for its intensity and -40 DEG C of ballistic works, and is not directed to manufacture experimently
The fatigue behaviour of steel plate.
Chinese patent CN 201710909081.0 disclose it is a kind of " TMCP type surrender 345MPa grades of Weather-resistance bridge steel plates and
Production method ".Compared with this application invention, Ti element, and setting in C and Mn element are not added in patent composition design
Difference is larger on meter；- 40 DEG C of 138J ballistic work is only provided in terms of its low temperature impact properties, the 120J of opposite national standard impacts
Function surplus capacity is smaller；It is not directed to the fatigue behaviour of trial-production steel plate simultaneously.
Chinese patent CN 201610750239.X discloses a kind of " special thick high-performance weathering bridge steel of crack arrest type
Q500qENH steel plate and its production method ".Compared with this application invention, it is not added with Ti element in patent composition design,
Mo element is added, and larger in the upper difference of Ni and Cr constituent content design, cost of alloy is compared to higher；It uses production simultaneously
Difference is larger in technique: the smelting stage uses VD+LF+VD mode to obtain required static ingot as hot rolling raw material, lumber recovery compared with
Greatly, production cost is higher；Manufactured experimently steel plate only relates to 50-100mm thick steel plates, and only provides -40 DEG C of ballistic works, does not provide
Under lower temperature and steel plate thickness center portion ballistic work situation.It is not directed to the fatigue behaviour of trial-production steel plate simultaneously.
Summary of the invention
Based on above-mentioned deficiency, it is an object of the present invention to provide a kind of yield strength >=420MPa high fatigue durability, easily welding
Weather-resistance bridge steel plate and its production method, the steel grade relative inexpensiveness, simple process is easily operated, is very suitable to continuous
Change mass production, steel plate comprehensive performance is good, and can weld for bridge construction industry towards large span, entirely, the hair without coating direction
Exhibition provides technical support.
In order to achieve the above objectives, by solution, its technical problem adopts the technical scheme that the present invention:
A kind of yield strength >=420MPa high fatigue durability, the Weather-resistance bridge steel plate easily welded, it is main for the steel plate
Chemical composition content wt% are as follows: C:0.06~0.09%, Si:0.25~0.40%, Mn:1.10~1.30%, P :≤
0.015%, S :≤0.005%, Cu:0.25~0.40%, Cr:0.40~0.60%, Ni:0.30~0.40%, Nb:0.015
~0.030%, Ti:0.010~0.030%, Al:0.020~0.045%, and CEV < 0.41% is controlled, remaining is Fe and can not
What is avoided is mingled with.
Corrosion resistance index I >=6.3 of the steel plate, Pcm≤0.19%, fatigue limit value σ-1> 300MPa, yield tensile ratio
≤ 0.82, -50 DEG C of ballistic work > 200J at steel plate thickness center.
The present invention also provides the preparation method of the Weather-resistance bridge steel plate of above-mentioned yield strength >=420MPa, the preparations
Method includes the following steps:
Smelting and continuous casting process: converter smelting is used, during which uses double slag operation to reduce P content；Pass through LF+RH essence
Refining is reduced containing pernicious gases and S contents such as O, H, N；Full guard casting is carried out using weather-proof mould flux, cooperates slighter compress work
Skill, for the control of slighter compress amount in 5~6mm, drawing speed control reinforces that continuous casting process one is cold, two cold techniques in 1.1~1.3m/min
Control, and the offline slow cooling 48h or more of continuous casting billet；
Heating process: the atmosphere in strict control heating furnace guarantees it for reproducibility or neutrality.Heating temperature be 1160~
1200 DEG C, heating speed presses 8~10min/cm, and soaking time is no less than 40min to guarantee that steel billet burns even grill thoroughly；Accelerate simultaneously
To shorten the residence time in the temperature range, guarantee is come out of the stove rolls the heating rate in 1100 DEG C or more high temperature sections；
Rolling mill practice: the perfect recrystallization area roughing of use >=1000 DEG C+880~900 DEG C of start rolling temperature non-recrystallization
The two stages controlled rolling process of area's finish rolling, and guarantee the last a time of rough rolling step in the maximum depression rate of hot rolling stage, it is intermediate to
Temperature thickness is 3.0~4.0 times of finished product thicknesses, rolls rear steel plate and carries out acceleration cooling, cooling rate < 10 DEG C/s, final cooling temperature control immediately
Between 620~660 DEG C.
In the present invention, steel plate group obtained by this method is woven to ferrite+pearlite complex tissue, thickness≤50mm.
In the present invention, in step 1) when smelting endpoint, [Mn]/[Si] is controlled 4.5~5.0, utmostly to improve group
Knit middle banded structure.
In the present invention, in LF refining, controlling Ca content in molten steel is 0.0008-0.0025%, to improve field trash shape
State.
In the present invention, in step 1) when smelting endpoint, [N]≤0.0040%；[H]≤0.0002%；[O]≤
0.0025%, [As]≤0.0050%, to guarantee slab and plate quality.
In the present invention, guarantee the last a time of rough rolling step in the maximum depression rate of hot rolling stage to guarantee enough deformations
Amount penetrates into slab center portion, has the function that sufficiently to refine crystal grain and uniform steel sheet thickness direction metallographic structure.
Present component design: being designed using low-carbon, as base and be aided with Nb+Ti combined microalloying using Cr+Cu+Ni, with
Reach steel plate and is provided simultaneously with excellent strong plasticity, cold temperature impact, weldability, fatigue durability and weldability.The technological process of production
Are as follows: molten iron pretreatment → 120t converter smelting → LF refining → RH refining → sheet billet continuous casting → slab slow cooling → slab cleaning → again
Hot stove heating → de-scaling → roughing → finish rolling → acceleration water cooling → thermal straightening → steel plate mark → steel plate slow cooling → shearing → mark
→ storage.The present invention is designed with mentioned component and easily operated thermal deformation and cooling technique, by the corrosion resistance of steel plate, low temperature
Impact flexibility, fatigue behaviour and welding performance perform to optimum level: yield strength >=420MPa, yield tensile ratio≤0.82；Elongation
Rate > 28%；- 50 DEG C of ballistic work >=300J, and -50 DEG C of ballistic work > 200J at steel plate thickness center；Its corrosion resistance index I
>=6.3, fatigue limit value σ-1> 300MPa.The steel grade has been well adapted for the needs of bridge construction industry development, builds for bridge
If industry develops offer technical support towards large span, full welding, without coating direction.
Detailed description of the invention
Fig. 1 is metallographic structure at 25mm Weather-resistance bridge surface of steel plate；
Fig. 2 is metallographic structure at 1/4 thickness of 25mm Weather-resistance bridge steel plate；
Fig. 3 is metallographic structure at 1/2 thickness of 25mm Weather-resistance bridge steel plate.
Specific embodiment
Any feature is disclosed to obtain in this specification, it unless specifically stated, can be equivalent or with similar purpose by other
Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.It is described to understand the present invention just for the sake of help, it should not be considered as to concrete restriction of the invention.
With the drawings and specific embodiments, the present invention is described in further detail below.
The steel plate for wind power that the three kinds of chemical components proportion produced using production technology of the invention is set forth below is implemented
Example 1,2 and 3, the steel plate chemical component that three embodiments obtain are matched referring to table 1, and specific production technology is shown in Table 2.
Generally, the production method of embodiment 1-3 steel plate in turn includes the following steps:
(1) smelting process: converter smelting is used；
(2) it LF refining+RH application of vacuum: is reduced by refining and RH application of vacuum technique harmful containing O, H, N etc. in molten steel
Gas and S content；In LF refining, controlling Ca content in molten steel is 0.0008-0.0030wt%, and [Mn]/[Si] is controlled 4.5
~5.0, utmostly to improve banded structure in tissue；[N]≤0.0040%；[H]≤0.0002%；[O]≤0.0025%,
[As]≤0.0050%, to guarantee slab and plate quality.
(3) continuous casting: carrying out full guard casting using weather-proof mould flux, cooperates slighter compress technique, the control of slighter compress amount
In 5~6mm, drawing speed control reinforces that continuous casting process one is cold, two cold technology controlling and process in 1.1~1.3m/min, and under continuous casting billet
Line slow cooling 48h or more, obtained continuous casting billet is having a size of 250*1800*3600 (mm).
(4) heating of plate blank: the atmosphere in strict control heating furnace guarantees it for reproducibility or neutrality.Heating temperature is
1160~1200 DEG C, heating speed presses 8~10min/cm, and soaking time is no less than 40min to guarantee that steel billet burns even grill thoroughly；Simultaneously
Accelerate the heating rate in 1100 DEG C or more high temperature sections to shorten the residence time in the temperature range, guarantee, which is come out of the stove, rolls.
(5) it rolling: using Stand Mill two stages controlled rolling process, roughing mill carries out >=1000 DEG C of perfect recrystallization rolling,
It is 3.0~4.0 times of finished product thicknesses to temperature thickness；Finishing mill start rolling temperature is 880~900 DEG C；
(6) it water cooling: rolls rear steel plate and carries out acceleration cooling immediately, cooling rate is 10~15 DEG C/s, and final cooling temperature is 600~650
DEG C, room temperature is air-cooled to after accelerating cooling.
Steel plate after water cooling is subjected to object performance inspection, the results are shown in Table 3.
The chemical component and content (wt%) of the Q420 rank Weather-resistance bridge steel plate of the present invention of table 1
| Number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| C | 0.075 | 0.076 | 0.081 |
| Si | 0.3 | 0.29 | 0.29 |
| Mn | 1.21 | 1.21 | 1.2 |
| P | 0.013 | 0.013 | 0.012 |
| S | 0.004 | 0.003 | 0.005 |
| Cu | 0.28 | 0.29 | 0.28 |
| Ni | 0.32 | 0.32 | 0.32 |
| Cr | 0.45 | 0.45 | 0.44 |
| As | 0.005 | 0.004 | 0.004 |
| Nb | 0.022 | 0.021 | 0.021 |
| Al | 0.033 | 0.031 | 0.036 |
| Ti | 0.015 | 0.013 | 0.018 |
| Ca | 0.0008 | 0.0008 | 0.0008 |
| H | 0.00013 | 0.0001 | 0.0001 |
| O | 0.001 | 0.0013 | 0.001 |
| N | 0.0017 | 0.0019 | 0.0018 |
| CEV | 0.406 | 0.408 | 0.409 |
The production technology of the Q420 rank Weather-resistance bridge steel plate of the present invention of table 2
| Number | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Heating temperature/DEG C | 1170 | 1168 | 1165 |
| Roughing start rolling temperature/DEG C | 1135 | 1131 | 1131 |
| Roughing finishing temperature/DEG C | 1085 | 1087 | 1088 |
| To temperature thickness/mm | 70 | 87.5 | 90 |
| Finish rolling start rolling temperature/DEG C | 880 | 878 | 876 |
| Finish rolling finishing temperature/DEG C | 829 | 832 | 834 |
| Open cold temperature/DEG C | 788 | 786 | 785 |
| Final cooling temperature/DEG C | 662 | 668 | 667 |
| Cooling rate/DEG C/s | 6 | 5 | 5 |
The object performance of the Q420 rank Weather-resistance bridge steel plate of the present invention of table 3
Yield strength, tensile strength and the test of elongation rate of 3 light plate of table refer to " the metal material room GB/T228-2002
Warm tension test ".The ballistic work test of steel refers to GB/T229-2007 " metal material Charpy pendulum impact test method ".
Fatigue limit value σ-1Test referring to GB/T 3075-2008 Metal Material Fatigue test axial force control method.
It is easily operated to can be seen that the simple process for data from the above table, and steel plate has moderate strength, and plasticity is good, low
The high feature of warm toughness, fatigue behaviour is good, is suitble to large-scale industrial production.
From Fig. 1 to Fig. 3, the metallographic structure figure of 25mm Weather-resistance bridge steel plate can be seen that steel plate group and be woven to ferrite+pearl
The complex tissue of body of light, more uniformly, grain size is not less than 11 grades and without bright for the tissue of steel plate through-thickness different location
Aobvious banded structure.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (5)
1. a kind of preparation method of the Weather-resistance bridge steel plate of yield strength >=420MPa, which is characterized in that the steel plate at
Divide and weight percent content is；C:0.06~0.09%, Si:0.25~0.40%, Mn:1.10~1.30%, P :≤
0.015%, S :≤0.005%, Cu:0.25~0.40%, Cr:0.40~0.60%, Ni:0.30~0.40%, Nb:0.015
~0.030%, Ti:0.010~0.030%, Al:0.020~0.045%, and CEV < 0.41% is controlled, remaining is Fe and can not
What is avoided is mingled with；
It the described method comprises the following steps:
1) smelting process: using converter smelting, refined by LF+RH, reduces and contains O, H, N pernicious gas and S content；Using all risk insurance
Shield casting, the offline slow cooling 48h or more of continuous casting billet；
2) heating process: heating temperature is 1160~1200 DEG C, and 8~10min/cm of heating speed, soaking time is no less than
40min；
3) rolling mill practice: the perfect recrystallization area roughing of use >=1000 DEG C+880~900 DEG C of start rolling temperature Unhydrated cement
The two stages controlled rolling process of finish rolling, intermediate to temperature thickness is 3.0~4.0 times of finished product thicknesses, roll rear steel plate carry out accelerating immediately it is cold
But, cooling rate < 10 DEG C/s, final cooling temperature are controlled at 620~660 DEG C；
Steel plate group obtained by this method is woven to ferrite+pearlite complex tissue, with a thickness of 20-50mm.
2. preparation method according to claim 1, which is characterized in that corrosion resistance the index I >=6.3, Pcm of the steel plate
≤ 0.19%, fatigue limit value σ-1> 300MPa, yield tensile ratio≤0.82, -50 DEG C of ballistic work > 200J at steel plate thickness center.
3. preparation method according to claim 1, which is characterized in that in step 1) when smelting endpoint, [Mn]/[Si] control
4.5~5.0.
4. preparation method according to claim 1, which is characterized in that in LF refining, controlling Ca content in molten steel is
0.0008-0.0025%.
5. preparation method according to claim 1, which is characterized in that in step 1) when smelting endpoint, [N]≤
0.0040%；[H]≤0.0002%；[O]≤0.0025%, [As]≤0.0050%.
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