CN104988429B - Structure steel plate for bridge with yield strength being 690MPa and production method thereof - Google Patents
Structure steel plate for bridge with yield strength being 690MPa and production method thereof Download PDFInfo
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Abstract
The invention discloses a structure steel plate for a bridge with the yield strength being 690MPa and a production method thereof. The structure steel plate comprises the following components in percent by weight: 0.040 percent to 0.080 percent of C, 0.20 percent to 0.25 percent of Si, 1.50 percent to 1.65 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.040 percent to 0.050 percent of Nb, 0.006 percent to 0.018 percent of Ti, 0.25 percent to 0.35 percent of Cr, 0.25 percent to 0.30 percent of Mo, 0.30 percent to 0.40 percent of Cu, 0.20 percent to 0.30 percent of Ni and the balance of Fe and unavoidable impurities, the sensitive composition of welding cracks meets the formula Pcm is less than or equal to 0.22, the carbon equivalent CEV is less than or equal to 0.50, 10C plus 4mn plus cr equals to 6.5 to 7.5. The structure steel plate designed and produced by the process has good toughness; the yield strength Rel is more than or equal to 690MPa, the tensile strength Rm is more than or equal to 770MPa, the elongation A is more than or equal to 18 percent, and -40 DEG C low-temperature impacting performance is more than or equal to 100J. Compared with the existing bridge steel technology, the structure steel plate disclosed by the invention has the advantages that the strength level is greatly improved; in addition, the welding performance of the steel plate is improved by strictly controlling the carbon equivalent CEV to be less than or equal to 0.50 and Pcm to be less than or equal to 0.22.
Description
Technical field
The invention belongs to metallurgical industry Bridge structural steel technical field, and in particular to a kind of yield strength 690MPa level
Structural steel for bridge plate and its production method.
Background technology
With developing rapidly for China's transport development, across footpath, operation load, road speed of bridge etc. are progressively being carried
Height, thus higher technical requirements are proposed to bridge steel.Comply with high-strength and high ductility, the excellent weldability of science of bridge building development need
The high performance bridge steel of energy, anti-fatigue performance and good weatherability properties energy will be the Main way of its development.Use intensity rank
High steel can preferably meet the big topology requirement of LARGE SPAN STEEL BRIDGE or some stress, mitigate steel plate thickness and reduce common
The consumption of intensity rank steel, can reduce bridge deadweight while use requirement is met, so as to realizing large span, reducing
Weld seam and node and improve transaction capabilities；Meanwhile, from the angle for improving bridge steel welding performance, also require to reduce bridge
The carbon equivalent and weld crack sensitivity coefficient of steel is improving welding performance.And excellent welding performance can be realized not preheated before weldering
Need not be heat-treated with postwelding, simplify welding procedure, reduces cost.
Jing is retrieved, and the Chinese invention patent of Application No. 201110123433.2 discloses a kind of structural steel for bridge and its life
Product method, the chemical composition of the structural steel for bridge of gained is included by weight：C：0.11～0.16%, Si：0.10～0.45%,
Mn：1.35～1.70%, S≤0.010%, P≤0.020%, Nb：0.025～0.060%, Ti：0.008～0.030%, V：
0.025～0.080%, Ni：0.10～0.50%, Als：0.015～0.060%, N≤40 × 10-6、O≤40×10-6、H≤2
×10-6, remaining is iron and inevitable impurity, and Als represents dissolved aluminum.The yield strength of the invention steel plate is not less than
370MPa, tensile strength is not less than 510MPa, and yield tensile ratio is not higher than 0.75, and elongation after fracture is not less than 30%, -40 DEG C of longitudinal directions
AKV is not less than 240J, can meet the manufacture requirements of high speed double-tracking railways bridge, also can promote for building, traffic, ocean platform
Etc. engineering structure.The invention is disadvantageous in that intensity is too low, while carbon content is too high, the rising of carbon content can increase steel plate
Carbon equivalent, it is difficult to ensure the good welding performance of steel plate.
The Chinese invention patent of Application No. 201210239313.3 discloses a kind of ultra-wide Thin Specs structural steel for bridge
Plate and its production method, the chemical composition of the ultra-wide Thin Specs structural steel for bridge plate is included by weight：C：0.12～
0.17%th, Si：0.20～0.45%, Mn：1.25～1.50%, S≤0.010%, P≤0.020%, Nb：0.010～
0.040%th, Ti：0.008～0.030%, Als：0.015～0.050%, N≤40 × 10-6、O≤20×10-6、H≤2×10-6, remaining is iron and inevitable impurity.The inventive method is comprised the following steps：Smelt and cast, in smelting and casting process
In, using converter or electric furnace smelting, casting is using continuous casting or molding.On the one hand, the casting of the invention relatively costly, the opposing party
Face, the steel plate yield strength of production is only 350～400MPa, while phosphorus content is up to 0.12%～0.17%.
Current structural steel for bridge is primarily present two problems to be found to published patent and document analysis：One is strong
Degree rank is relatively low, focuses mostly in the research of below 500MPa bridge steels；Two is the phosphorus content height of invention steel grade, and this has a strong impact on
The weldability of bridge steel, increased bridge construction cost.
The content of the invention
Present invention aim to address the deficiencies in the prior art, there is provided a kind of yield strength 690MPa level structural steel for bridge
Plate and its production method, based on continuous casting billet, by rationally control steel plate composition, rolling mill practice, cooling technique and quenched work
The method of skill is manufacturing the good yield strength of welding performance for 690MPa structural steel for bridge plates.The outstanding advantage of the present invention
It is the yield strength for substantially increasing bridge steel, mitigates steel plate thickness and reduce the consumption of regular tenacity rank steel, full
Bridge deadweight can be reduced while sufficient use requirement, so as to realize bridge large span, is on the other hand bent in raising bridge steel
While taking intensity, Pcm and CEV is also greatly reduced, improves the welding performance of bridge steel, simplify welding procedure.
For achieving the above object, the present invention designed by yield strength 690MPa level structural steel for bridge plate, its chemistry into
Point percetage by weight be：C：0.040～0.080%, Si：0.20～0.25%, Mn：1.50～1.65%, P：≤
0.010%, S：≤ 0.005%, Nb：0.040～0.050%, Ti：0.006～0.018%, Cr：0.25～0.35%, Mo：
0.25～0.30%, Cu：0.30～0.40%, Ni：0.20～0.30%, remaining is Fe and is inevitably mingled with, in order to protect
Card the Bridge of the present invention good welding performance of steel acquisition and toughness and tenacity, its chemical composition also needs to meet：Weld crack
Sensitiveness combines Pcm≤0.22, carbon equivalent ce V≤0.50,10C+4Mn+Cr=6.5～7.5；Wherein,
Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B,
CEV=C+Mn/6+ (Cr+V+Mo)/5+ (Ni+Cu)/15.
Wherein, in the case of the compound addition of C, Mn and Cr, the quenching degree of steel is more conducively improved, but the too high levels of three are again
The toughness of steel can be caused to be reduced, and research shows 10C+4Mn+Cr<When 6.5, the quenching degree of steel is tested not enough, thicker steel plate is being adjusted
During matter, tend not to obtain preferable martensitic structure, cause quenched rear armor plate strength not enough；And work as 10C+4Mn+Cr>7.5
When, the quenching degree of sample steel is preferable, but tests the toughness deficiency of steel, often leads to ballistic work and does not conform to；Meanwhile, steel of the present invention also leads to
Cross and strictly control Pcm values and the next effective improving welding properties of carbon equivalent ce V.
Preferably, the percetage by weight of the steel plate chemical composition is：C：0.042～0.065%, Si：0.21
～0.24%, Mn：1.52～1.54%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.045～0.050%, Ti：0.011～
0.018%, Cr：0.28～0.33%, Mo：0.25～0.30%, Cu：0.34～0.37%, Ni：0.25～0.30%, remaining
For Fe and inevitably it is mingled with；Also, meet welding crack sensibility combination Pcm≤0.22, carbon equivalent ce V≤0.50,10C
+ 4Mn+Cr=6.5～7.5.
Used as more preferably scheme, the percetage by weight of the steel plate chemical composition is：C：0.061%, Si：0.22%, Mn：
1.53%, P：≤ 0.010%, S：≤ 0.005%, Nb：0.047%, Ti：0.015%, Cr：0.32%, Mo：0.25%, Cu：
0.36%, Ni：0.28%, remaining is Fe and is inevitably mingled with.
Preferably, steel plate yield strength Rel>=690MPa, tensile strength Rm>=770MPa, elongation percentage A >=
18%, -40 DEG C of low temperature impact properties >=100J.
The production method of above-mentioned yield strength 690MPa level structural steel for bridge plate, comprises the steps：
1) smelted according to the percetage by weight proportioning of the chemical composition, alloy content and be casting continuously to form in control molten steel
Base；
2) by step 1) in the heating strand that obtains and be incubated, heating and temperature control is at 1180～1220 DEG C, it is ensured that in stove
Time is 250～400min, and in the case where temperature is for 1180～1220 DEG C 60～70min is incubated；
3) segmentation rolling：
Roughing：It is 1100～1180 DEG C to control roughing start rolling temperature, roughing percentage pass reduction >=15%, roughing end temp
≥1000℃；
Finish rolling：Finish rolling start rolling temperature is controlled for 850～870 DEG C, accumulative reduction ratio >=50% in three roads after finish rolling, finish rolling terminates
Temperature is 810～830 DEG C；
4) cool down：Being cooled down after finish to gauge, begun to cool down temperature control at 750～820 DEG C, cooling velocity is 3～9 DEG C/
s；
5) modifier treatment：
Quenching：Hardening heat is 900～940 DEG C, and temperature retention time is 40～90min；
High tempering：Temperature is 590～640 DEG C, and time inside furnace is 60～120min.
Preferably, the step 5) in, temperature retention time adds 25～40min for thickness of slab during quenching, is incubated during tempering
Time adds 45～60min for thickness of slab.Steel plate of the thickness of slab for 16mm is for example manufactured, then temperature retention time is 41～56min when quenching, and is returned
Temperature retention time is 61～76min when fiery.
The effect of each element and master operation in the present invention：
C is to improve most effective, the most economical element of steel strength in the present invention, with the increase of carbon content, the intensity of steel
With quenching degree also with increasing considerably, but while the increase of carbon content can cause steel plate elongation percentage and toughness to decline, weldability
Can weaken, consider the intensity and toughness of steel, and consider to reduce carbon equivalent to improve welding performance, by the value model of C content
Enclose and be set to 0.040～0.080%.
Si is the essential elements of deoxidation in steel making in the present invention, can improve the intensity of steel, reduces graphitization tendency in steel, but
Can significantly deteriorate the toughness of steel and the toughness of welding heat affected zone simultaneously, therefore, the content of Si is controlled in reduced levels：0.20
～0.25%.
In the present invention in the case where C content is reduced, Mn is most important Strengthening and Toughening element, and it can improve the through hardening of steel
Property, promote the formation of bainite/martensite tissue, it has been experienced that：1% Mn can about improve the tensile strength of 100MPa,
But Mn too high levels are easily caused composition and microstructure segregation.Consider, Mn contents are designed as 1.55～1.65%.
Cu in the present invention, Ni：Cu and Ni are austenite former, promote austenitic formation and stabilisation, improve
Steel plate tensile strength.The addition of Cu can improve corrosion resistance, the intensity of steel, improve the weldability and machining property of experiment steel
Energy.The addition of Ni improves the low-temperature flexibility of steel simultaneously, but Ni too high levels can deteriorate the welding performance of steel plate.Copper in steel can be bright
Aobviously comprehensive function is played with the boron for adding, copper is combined with boron plus membership further suppresses the ferrite before bainite transformation to be formed,
Can be more easy to obtain martensitic structure when quenched.But Cu too high levels can cause the hot-short phenomenon of steel, deteriorate surface of steel plate matter
Amount.A certain amount of Ni and Cu coordinates addition to improve this phenomenon.Therefore Ni contents 0.20～0.30%, Cu contents are controlled
0.30～0.40%.
Cr is a kind of element that can effectively improve armor plate strength and quenching degree in the present invention, and it can make ferritic phase become apparent
Move to right, the cooling rate for widening bainitic transformation is interval, promote the formation of middle temperature transformation tissue, but while when Cr too high levels, meeting
Significantly lower the toughness of base material and heat affected area, while in the case of the compound addition of C, Cu and Cr, more conducively improving the through hardening of steel
Property, but the too high levels of three can cause again, and the toughness of sample is reduced, Cr contents 0.25～0.35%.
Mo can significantly improve quenching degree in the present invention, so as to be conducive to the formation of martensite.But Mo contents are higher than 0.4%
When, steel plate cool attenuation can be improved, welding performance is reduced, while HAZ regions can be promoted to form thick lower bainite group
Knit so that HAZ performances significantly decline.Mo contents 0.25～0.30%.
Nb is strong carbon, nitride forming element in the present invention, and it can form tiny carbide and nitride, suppresses high
Warm area austenite crystal is grown up.In austenite recrystallization temperature region in the operation of rolling, the carbon of Nb, nitride can be made
For austenite crystal forming core core；In the range of non-recrystallization temperature, the carbon of the Nb of Dispersed precipitate, nitride can effective anchorings
Austenite grain boundary, prevents austenite crystal from further growing up, and so as to fining ferrite grains, improves the intensity and toughness of steel.Nb
Content is too low to be caused yield strength can be caused not enough, and Nb too high levels can cause to weld welding heat affected zone in cooling procedure
There is M/A islands tissue and deteriorate its performance.The content of Nb is chosen to be in this test steel：0.035～0.045%.
Ti of the present invention is also a kind of strong carbon, nitride forming element, can also play a part of crystal grain thinning.It can significantly be carried
The toughness of the room temperature strength, elevated temperature strength and steel of Gao Gang.In addition, the nitridation precipitate of Ti can effective anchoring austenite grain boundary, suppression
Growing up for austenite crystal processed, substantially improves the low-temperature flexibility of the welding heat affected zone of steel.But, too high Ti contents can cause
The modeling of steel, toughness are reduced.During laboratory development, Ti contents are designed as：0.006～0.015%.
The present invention has advantages below：
First, the yield strength that production steel plate is designed by present invention process is 690MPa structural steel for bridge plates, is had
Good obdurability, the yield strength Rel >=690MPa of steel plate of the present invention, tensile strength Rm >=770MPa, elongation percentage A >=
18%, -40 DEG C of low temperature impact properties >=100J, compared with existing highway bridge steel technology, substantially increase intensity rank, at present input
Using the bridge steel of mostly 500MPa ranks；
Second, by strict control carbon equivalent ce V≤0.50, Pcm≤0.22 is improving the welding of steel plate for the inventive method
Performance, after welding without the need for preheating or preheating temperature be not higher than 50 DEG C, be not required to after welding heat treatment, substantially increase welding efficiency and
Welding quality, improves the welding performance of bridge steel, simplifies welding procedure；
3rd, the outstanding advantage of the present invention is the yield strength for substantially increasing bridge steel, mitigates steel plate thickness and subtracts
The consumption of few regular tenacity rank steel, can reduce bridge deadweight, so as to realize that bridge is big while use requirement is met
Span.
Description of the drawings
Fig. 1 is the scanning electron microscope (SEM) photograph of the steel plate tissue of the production of embodiment 1.
Fig. 2 is the scanning electron microscope (SEM) photograph of the steel plate tissue of the production of embodiment 2.
Fig. 3 is the scanning electron microscope (SEM) photograph of the steel plate impact fracture of the production of embodiment 1.
Fig. 4 is the scanning electron microscope (SEM) photograph of the steel plate impact fracture of the production of comparative example 1.
Fig. 5 is the scanning electron microscope (SEM) photograph of the thick test steel quenching state+tempering state sample precipitates of 16mm.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings：
Table 1 is the comparative example of various embodiments of the present invention and comparative example chemical composition；
Table 2 is that various embodiments of the present invention and comparative example chemical composition meet coefficient list；
Table 3 is various embodiments of the present invention and comparative example main technologic parameters list；
Table 4 is the mechanical property experimental results list of various embodiments of the present invention and comparative example.
Various embodiments of the present invention are produced according to following steps：
1) smelted according to the percetage by weight proportioning of the chemical composition, alloy content and be casting continuously to form in control molten steel
Base；
2) by step 1) in the heating strand that obtains and be incubated, heating and temperature control is at 1180～1220 DEG C, it is ensured that in stove
Time is 250～400min, and in the case where temperature is for 1180～1220 DEG C 60～70min is incubated；
3) segmentation rolling：
Roughing：It is 1100～1180 DEG C to control roughing start rolling temperature, roughing percentage pass reduction >=15%, roughing end temp
≥1000℃；
Finish rolling：Finish rolling start rolling temperature is controlled for 850～870 DEG C, accumulative reduction ratio >=50% in three roads after finish rolling, finish rolling terminates
Temperature is 810～830 DEG C；
4) cool down：Being cooled down after finish to gauge, begun to cool down temperature control at 750～820 DEG C, cooling velocity is 3～9 DEG C/
s；
5) modifier treatment：
Quenching：Hardening heat is 900～940 DEG C, and temperature retention time is 40～90min；
High tempering：Temperature is 590～640 DEG C, and time inside furnace is 60～120min.
The comparative example of the various embodiments of the present invention of table 1 and comparative example chemical composition：
Table 2 is that various embodiments of the present invention and comparative example chemical composition meet coefficient list：
| Embodiment | Thickness of slab/mm | Pcm | CEV | 10C+4Mn+Cr | I |
| 1 | 16 | 0.18 | 0.451 | 6.86 | 6.73 |
| 2 | 16 | 0.20 | 0.473 | 7.05 | 6.75 |
| 3 | 16 | 0.22 | 0.499 | 7.25 | 6.74 |
| 4 | 30 | 0.20 | 0.470 | 7.01 | 6.75 |
| 5 | 60 | 0.20 | 0.471 | 6.95 | 6.72 |
| Contrast 1 | 16 | 0.26 | 0.525 | 8.5 | 6.77 |
| Contrast 3 | 16 | 0.21 | 0.466 | 0.053 | 6.70 |
Table 3 is various embodiments of the present invention and comparative example main technologic parameters list：
Table 4 is the mechanical properties test result of various embodiments of the present invention and comparative example：
The steel grade that embodiment 1～5 is refined in the present invention can be seen that by table 1 to the data of table 3 and be satisfied by the present invention
The performance indications of steel plate：Meet yield strength Rel>=690MPa, tensile strength Rm>=770MPa, elongation percentage A >=18%, -20 DEG C
Low temperature impact properties >=100J, while carbon equivalent ce V≤0.50 of steel of the present invention, Pcm≤0.22.
It can be seen from Table 4 that, the 10C+4Mn+Cr values up to 8.5 of comparative example 1, although its quenching degree is preferable, but C, Mn
The increase of content result in experiment hardness of steel and raise, and impact property declines, while its carbon equivalent is also higher to have had a strong impact on material
Welding performance；And comparative example 2, because 10C+4Mn+Cr values are than relatively low, its quenching degree is poor, or even in the regional area of steel plate
Bainite structure is occurred in that, causes the intensity of steel plate relatively low.
The tissue that the steel plate of embodiment 1 and the production of embodiment 2 is can be seen that by Fig. 1 and Fig. 2 is predominantly tempered Soxhlet
Body；As can be seen from Figure 3 the impact fracture pattern of the steel plate of the production of embodiment 1 is dimple columnar fracture, and toughness is preferable；Can from Fig. 4
To find out the impact fracture pattern of the steel plate that comparative example 1 is produced as cleavage columnar fracture, toughness is substantially poor compared with embodiment 1；Can from Fig. 5
There is substantial amounts of point-like precipitate in find out test steel quenching state+tempering state sample precipitate form of the thickness of slab as 16mm, it is numerous
Point-like precipitate plays an important role in Steel Properties reinforcing.
Above-described embodiment is only most preferably enumerated, and is not the restriction to embodiments of the present invention.
Claims (6)
1. a kind of yield strength 690MPa level structural steel for bridge plate, it is characterised in that：The weight hundred of the steel plate chemical composition
Fraction is：C：0.040～0.080%, Si：0.20～0.25%, Mn：1.50～1.65%, P：≤ 0.010%, S：≤
0.005%, Nb：0.040～0.050%, Ti：0.006～0.018%, Cr：0.25～0.35%, Mo：0.25～0.30%,
Cu：0.30～0.40%, Ni：0.20～0.30%, remaining is Fe and is inevitably mingled with；Also, it is quick to meet weld crack
Perception combination Pcm≤0.22, carbon equivalent ce V≤0.50,10C+4Mn+Cr=6.5～7.5；Wherein,
Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B,
CEV=C+Mn/6+ (Cr+V+Mo)/5+ (Ni+Cu)/15；
The method comprises the steps：
1) smelted according to the percetage by weight proportioning of the chemical composition, alloy content and base is casting continuously to form in control molten steel；
2) by step 1) in the heating strand that obtains and be incubated, heating and temperature control is at 1180～1220 DEG C, it is ensured that time inside furnace
For 250～400min, in the case where temperature is for 1180～1220 DEG C 60～70min is incubated；
3) segmentation rolling：
Roughing：It is 1100～1180 DEG C to control roughing start rolling temperature, roughing percentage pass reduction >=15%, roughing end temp >=
1000℃；
Finish rolling：Finish rolling start rolling temperature is controlled for 850～870 DEG C, accumulative reduction ratio >=50% in three roads, finish rolling end temp after finish rolling
For 810～830 DEG C；
4) cool down：Cooled down after finish to gauge, begun to cool down temperature control at 750～820 DEG C, cooling velocity is 3～9 DEG C/s；
5) modifier treatment：
Quenching：Hardening heat is 900～940 DEG C, and temperature retention time is 40～90min；
High tempering：Temperature is 590～640 DEG C, and time inside furnace is 60～120min.
2. yield strength 690MPa level structural steel for bridge plate according to claim 1, it is characterised in that：The steel plate chemistry
The percetage by weight of composition is：C：0.042～0.065%, Si：0.21～0.24%, Mn：1.52～1.54%, P：≤
0.010%, S：≤ 0.005%, Nb：0.045～0.050%, Ti：0.011～0.018%, Cr：0.28～0.33%, Mo：
0.25～0.30%, Cu：0.34～0.37%, Ni：0.25～0.30%, remaining is Fe and is inevitably mingled with, also, full
Sufficient welding crack sensibility combines Pcm≤0.22, carbon equivalent ce V≤0.50,10C+4Mn+Cr=6.5～7.5.
3. yield strength 690MPa level structural steel for bridge plate according to claim 2, it is characterised in that：The steel plate chemistry
The percetage by weight of composition is：C：0.061%, Si：0.22%, Mn：1.53%, P：≤ 0.010%, S：≤ 0.005%, Nb：
0.047%, Ti：0.015%, Cr：0.32%, Mo：0.25%, Cu：0.36%, Ni：0.28%, remaining is for Fe and unavoidably
Be mingled with.
4. the yield strength 690MPa level structural steel for bridge plate according to claims 1 to 3 any one, it is characterised in that：
Steel plate yield strength Rel>=690MPa, tensile strength Rm>=770MPa, elongation percentage A >=18%, -40 DEG C of low temperature impact properties
≥100J。
5. the production method of yield strength 690MPa level structural steel for bridge plate described in a kind of claim 1, it is characterised in that：Should
Method comprises the steps：
1) smelted according to the percetage by weight proportioning of the chemical composition, alloy content and base is casting continuously to form in control molten steel；
2) by step 1) in the heating strand that obtains and be incubated, heating and temperature control is at 1180～1220 DEG C, it is ensured that time inside furnace
For 250～400min, in the case where temperature is for 1180～1220 DEG C 60～70min is incubated；
3) segmentation rolling：
Roughing：It is 1100～1180 DEG C to control roughing start rolling temperature, roughing percentage pass reduction >=15%, roughing end temp >=
1000℃；
Finish rolling：Finish rolling start rolling temperature is controlled for 850～870 DEG C, accumulative reduction ratio >=50% in three roads, finish rolling end temp after finish rolling
For 810～830 DEG C；
4) cool down：Cooled down after finish to gauge, begun to cool down temperature control at 750～820 DEG C, cooling velocity is 3～9 DEG C/s；
5) modifier treatment：
Quenching：Hardening heat is 900～940 DEG C, and temperature retention time is 40～90min；
High tempering：Temperature is 590～640 DEG C, and time inside furnace is 60～120min.
6. the production method of yield strength 690MPa level structural steel for bridge plate according to claim 5, it is characterised in that：Institute
State step 5) in, temperature retention time adds 25～40min for thickness of slab during quenching, and temperature retention time adds 45～60min for thickness of slab during tempering.
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| CN100455692C (en) * | 2006-12-08 | 2009-01-28 | 武汉钢铁(集团)公司 | High-strength weathering steel and method of manufacturing same |
| CN102888571B (en) * | 2012-10-26 | 2014-05-21 | 江苏省沙钢钢铁研究院有限公司 | 690MPa-level low weld crack sensitive steel and production method thereof |
| CN104294154B (en) * | 2014-09-23 | 2017-01-11 | 武汉钢铁(集团)公司 | Thick steel plate with excellent low-temperature toughness and Rm structure of 630MPa grade and production method of thick steel plates |
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| CN109988968A (en) * | 2019-03-12 | 2019-07-09 | 河钢股份有限公司 | A kind of big thickness Q690E grades of high strength steel plates of low-carbon-equivalent and its production method |
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