CN105063511B - Ultra-low carbon bainite thin gauge steel plate rolled through heavy and medium plate mill and production method of ultra-low carbon bainite thin gauge steel plate - Google Patents
Ultra-low carbon bainite thin gauge steel plate rolled through heavy and medium plate mill and production method of ultra-low carbon bainite thin gauge steel plate Download PDFInfo
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Abstract
The invention discloses an ultra-low carbon bainite thin gauge steel plate rolled through a heavy and medium plate mill. The ultra-low carbon bainite thin gauge steel plate comprises, by weight, 0.02%-0.08% of C, 0.10%-0.40% of Si, 0.90%-2.00% of Mn, 0.018% of P or less, 0.005% of S or less, 0.40% of Cu or less, 0.0003% of B or less, 0.10%-0.55% of Ni, 0.10%-0.40% of Mo, 0.12%-0.60% of Cr, 0.030%-0.090% of V, 0.010%-0.035% of Nb, 0.005%-0.035% of Ti, 0.060% of Als or less and the balanced Fe and inevitable impurities. A production method comprises the steps of smelting, casting, heating, rolling, slitting, intermediate material heating, rough rolling, finish rolling and cooling control. The ultra-low carbon bainite thin gauge steel plate is reasonable in process, good in product performance and small in unevenness and can be widely applied to bridge U rib structures.
Description
Technical field
The present invention relates to the low-alloy structural steel making field in ferrous metallurgy materials, in particular to a kind of heavy and medium plate mill
Rolling ULCB class thin specification steel plate and its production method.
Background technology
In bridge steel field, with the raising of steel grade intensity rank, the organization type of steel gradually from ferrite+pearlite to
ULCB changes.ULCB tissue belongs to a kind of middle temperature transformation tissue, with intensity height, good toughness, easily welds
The features such as connecing, gradually promotes in bridge steel field.In some sciences of bridge building, it is desirable to adopt Ultra-low carbon shellfish on bridge U-rib
Family name's body steel, and the thickness of U rib steel plates is generally 6mm or 8mm.ULCB sheet metal is generally rolled using hot continuous rolling process
System, but the technique includes coiling machine rolling process, carries out again winding off flat technique in follow-up use, and the technique is accumulated aborning
Substantial amounts of residual stress is tired out, residual stress can discharge in the operation such as slitting, milling side, bending, welding in the manufacture of U ribs, cause
Steel plate produces side sway, distortion etc. affects the problem of scantling precision.If produced using heavy and medium plate mill, due to aborning
Equality operation is not crimped and opened, thus residual stress is less, scantling precision is easily guaranteed that in processing and manufacturing, but this
Plant technique and there is very big production difficulty, wherein most distinct issues are exactly the control of temperature and plate shape when producing.
In a kind of Chinese invention patent " 6mm steel plate rolling techniques " of Publication No. CN101259482A, application is disclosed
A kind of 6mm steel plate rolling techniques, the technique light plate are not quickly cooled down after rolling, and can only produce ferrite+pearlite group
The steel plate of type is knitted, control difficulty is relatively low, but its intensity is relatively low.
The Chinese invention patent of Publication No. CN103469066A is " a kind of to produce high-mouldability energy steel using heavy and medium plate mill
In the method for plate and its obtained steel plate ", the steel plate that embodiment is enumerated is required to cooling control after rolling, can only also produce ferrite+pearl
The steel plate of body of light organization type.
Chinese invention patent " the 2800mm Stand Mill heavy and medium plate mill Limit specifications steel of Publication No. CN 102688884A
In plate rolling mill practice ", for Ultra-thin steel plate, cooling control after rolling is not required, its illustration enumerated is also ferrite+pearlite
The Q345B steel of organization type.
A kind of Chinese invention patent " system of rolled Thin Specs high intensity bridge plate of 104264062 A of Publication No. CN
Make method " in, application discloses a kind of method of rolling thin specification steel plate, and the illustration in embodiment is 8mm thickness steel plates,
The tissue of its steel plate is not ferrite+pearlite type, but acicular ferrite+granular bainite, but its content requirement to P
It is relatively tight, P content≤0.013% is controlled, and requires the V element of addition 0.02～0.04%, it is clear that increased smelting cost.Separately
Outward, the patent is indefinite to rolled blank gauge lattice, but in embodiment, sotck thinkness is 220mm, in rolling 8mm thickness
During steel plate, finished steel plate length can be caused in more than 30m so that steel plate temperature homogeneity in the longitudinal direction it is difficult to ensure that,
And then affect the uniformity of mechanical property of steel plate.
A kind of Chinese invention patent " Stand Mill heavy and medium plate mill Thin Specs pipe line steel of Publication No. CN 102671941A
Production technology " in, claims do not have the organization type of clear and definite steel plate, but are X70 pipe line steels in embodiment, this steel
Although organization type be not ferrite+pearlite, in claim 1 thickness of clear and definite slab be 180mm, this causes steel
Production limited by slab thickness.And the technology is produced by the way of thick steel billet is once rolled down to bottom, can also be caused
The length of finished steel plate is oversize and cause difficult shifting of temperature homogeneity to ensure, and then affect mechanical property of steel plate and plate shape.
Therefore it provides it is a kind of with good mechanical property, excellent welding performance and cold machine-shaping, product not
The little heavy and medium plate mill rolling ULCB class thin specification steel plate of Pingdu and its production method have important practical significance.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, there is provided a kind of heavy and medium plate mill rolls Ultra-low carbon shellfish
Family name's body class thin specification steel plate and its production method.
For achieving the above object, the technical solution used in the present invention is：A kind of heavy and medium plate mill rolls ULCB
Class thin specification steel plate, the chemical composition of steel plate and its percentage by weight it is as follows：C：0.02～0.08%, Si：0.10～0.40%,
Mn：0.90～2.00%, P≤0.018%, S≤0.005%, Cu≤0.40%, B≤0.0003%, Ni：0.10～0.55%,
Mo：0.10～0.40%, Cr：0.12～0.60%, V：0.030～0.090%, Nb：0.010～0.035%, Ti：0.005～
0.035%, Als≤0.060%, remaining is Fe and inevitable impurity；And while meet：V/Nb=2.0～2.7, carbon equivalent
CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.475%, welding crack sensibility indices P cm=C+Si/30+
Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.23%.
Further, the chemical composition of steel plate and its percentage by weight are as follows：C：0.02～0.08%, Si：0.10～
0.40%, Mn：1.20～1.70%, P≤0.018%, S≤0.005%, Cu≤0.40%, B≤0.0003%, Ni：0.15～
0.50%, Mo：0.10～0.30%, Cr：0.15～0.60%, V：0.040～0.080%, Nb：0.015～0.030%, Ti：
0.008～0.030%, Als≤0.060%, remaining is Fe and inevitable impurity.
Further, the chemical composition of steel plate and its percentage by weight are as follows：C：0.05%, Si：0.25%, Mn：
1.55%, P：0.012%, S：0.002%, Cu：0.20%, B：0.00012%, Ni：0.20%, Mo：0.15%, Cr：
0.18%, V：0.050%, Nb：0.022%, Ti：0.010%, Als：0.030%, remaining is Fe and inevitable impurity.
In the heavy and medium plate mill rolling ULCB class thin specification steel plate of the present invention, each composition effect is as follows：
Carbon (C)：Carbon is the effective element for improving hardness of steel, and when content is more than 0.08%, after rolling, rate of cooling is larger
When, M/A islands are easily formed, and easily Assembled distribution is taken in segregation bar, cause mechanical property of steel plate to present significantly vertically and horizontally poor
It is different；When its content is relatively low, such as less than 0.02%, armor plate strength can be made not enough, while difficulty when can also increase smelting.Cause
This, controlling carbon content scope is：0.02～0.08%.
Silicon (Si)：Silicon is conventional deoxidizer, and having, and is conducive to improving its combination property, but Si contents
When higher, reduce toughness, plasticity and the ductility of steel, be easily caused it is cold short be unfavorable for welding.Therefore, it is of the invention by the content of Si
Desired value is controlled 0.10～0.40%.
Manganese (Mn)：Manganese is important Strengthening and Toughening element, can increase the stability of austenite, expands γ phase region austenites, is promoted
Enter the middle temperature structural transformation of steel.The too high toughness that steel billet center segregation is adversely affected, steel plate is impaired of Mn contents, and
Easily crack during welding, Mn contents are too low, middle temperature structural transformation can not be effectively facilitated, the intensity of steel is easily reduced.Therefore
Controlling Mn content ranges is：0.90～2.00%.
Phosphorus (P)：Phosphorus is harmful element in steel, and its content strictly will be controlled, and high P content can increase the cold short of steel and incline
To, and P is easily in the center portion segregation of steel billet, due to the high strong segregated zone of this P content it is more crisp so that easily produce after steel rolling
Raw latent defect.The phosphorus content of the present invention is controlled to P≤0.018%.
Sulfur (S)：Sulfur is harmful element in steel, and high S contents can not only make steel plate, and vertically and horizontally performance produces notable difference,
Also its low-temperature flexibility and Z-direction performance are reduced simultaneously.Sulfur content of the present invention is S≤0.005%.
Copper (Cu)：Copper can improve its quenching degree in steel, act primarily as solid solution and precipitation enhancement, in addition with beneficial to obtaining
Low-temperature flexibility well is obtained, increases its fatigue crack extended capability；But when its addition is more than 0.40%, the sweating heat of steel plate
Zone of influence toughness can be reduced, and steel billet is also easy to produce check crack in heating process.The copper content control of the present invention is Cu≤0.40%.
Boron (B)：Boron can improve the quenching degree of steel, but content increases and can increase crack sensitivity to Grain Boundary Segregation.The present invention
The middle content for controlling boron is B≤0.0003%.
Nickel (Ni)：Nickel can improve quenching degree, with certain invigoration effect, can significantly improve its low-temperature flexibility, make base material
Increase substantially with Low Temperature Impact Toughness of Heat-affected Zone, while Ni can also effectively prevent the hot-short check crack for causing of Cu.When itself plus
Enter amount less than 0.10%, then Ni does not have effect, but too high levels easily cause steel-plate iron oxide scale and are difficult to come off and increase steel
Cost.Ni contents of the present invention are：0.10～0.55%.
Molybdenum (Mo)：Molybdenum can make ferrite separate out and increase the stability of austenite, the formation to pearlite from austenite
With strong inhibition, but Mo belongs to noble element, and excessive Mo will improve the cost of steel；Simultaneously too high Mo contents
The low-temperature flexibility of steel can be made significantly to deteriorate, martensite is formed in welding, cause welding point fragility to increase.Therefore in control steel
Mo content ranges are：0.10～0.40%.
Chromium (Cr)：Chromium can improve the intensity and hardness of steel, but its too high levels then easily increases welding difficulty, and content mistake
It is low, can not effectively play its effect.In the present invention, the content of Cr is controlled to 0.12～0.60%.
Vanadium (V) and niobium (Nb)：In ultra-low-carbon bainite steel, only add substantial amounts of Nb, be remarkably improved intensity, due to which
Substantially, it is higher to also result in yield tensile ratio for grain refinement effect, therefore, Nb contents are limited in into reduced levels in the present invention, which is strong
The loss of degree is then by adding suitable V ensureing.In the present invention, the content of V is 0.030～0.090%.Niobium is strong carbon nitridation
Compound formation element, can improve the austenite recrystallization temperature of steel, and austenite can be rolled under higher rolling temperature.
In addition precipitation strength effects of the Nb in controlled rolling continuous cooling process, can by the strain induced precipitate of the carbonitride of Nb
With pinning austenite crystal, crystal grain thinning simultaneously improves intensity and low-temperature flexibility.But when Nb contents are more than 0.035%, crystal grain thinning
Improve the effect of intensity clearly, but also cause its yield tensile ratio too high；When its content is less than 0.010%, controlled rolling is not played
Effect.Therefore controlling Nb content ranges is：0.010-0.035%.
Titanium (Ti)：Titanium is carbide, can form trickle TiC granules, and crystal grain thinning can prevent crystalline substance
Between corrosion phenomenon, improving welding property.Ti content of the present invention is：0.005～0.035%.
Aluminum (Als)：Aluminum is the main deoxidant element in steel, and the oxide for causing Als is mingled with increasing during Als too high levels
Plus, the degree of purity of steel is reduced, is unfavorable for the toughness of steel.The fusing point of Als is higher, and aborning, Als can be used to prevent crystal grain long
Greatly.Ti content is controlled in the present invention for Als≤0.060%.
Further, the mechanical property of steel plate of the invention is：Yield strength ReLFor 500～630MPa, yield tensile ratio ReL/
Rm≤0.83, -40 DEG C of impact absorbing energy KV2>=120J, steel plate unevenness are less than 3 ‰, with excellent welding performance and cold rnning
Work formability.
Above-mentioned heavy and medium plate mill rolls the production method of ULCB class thin specification steel plate, comprises the steps：Smelting
Refining, casting, continuous casting billet heating, continuous casting billet milling, intermediate wood cutting, intermediate wood heating, intermediate wood roughing, intermediate wood finish rolling and steel
Plate control is cold.In continuous casting billet heating stepses, thickness of strand is 150～300mm, and heating-up temperature is 1210～1250 DEG C；Continuous casting billet
In milling step, it is the intermediate wood that thickness is 60～80mm by continuous casting billet milling, rolls end temp >=1000 DEG C；Intermediate wood adds
In hot step, heating-up temperature is 1210～1250 DEG C；In intermediate wood roughing step, according to finished steel plate thickness, it is divided into 3～4 roads
Secondary, wherein 1～2 passage of broadening, rolling terminate rear intermediate wood thickness for 20～40mm, and this temperature losses of the process is controlled to 10～15 DEG C；
In intermediate wood finish rolling step, according to finished steel plate thickness, it is divided into 6～8 passages, this temperature losses of the process is controlled to 150～200 DEG C；Steel
In the cold step of plate control, temperature is begun to cool down for 720～760 DEG C, be cooled to 520～580 DEG C with the cooldown rate of 6～9 DEG C/S, so
After naturally cool to room temperature.
Further, in the intermediate wood roughing step, rolling started temperature be >=1070 DEG C, rolling end temp for >=
1030℃。
Further, in the intermediate wood finish rolling step, rolling started temperature is≤1020 DEG C, and rolling end temp is
770～840 DEG C.
Compared with prior art, the present invention has advantages below：
(1) present invention is reduced by way of reheating rolling after rolling thinning and cutting to initial continuous casting steel billet
The length of final rolled plate, it is ensured that steel plate along the temperature homogeneity rolled upwards, while by control intermediate wood roughing, in
Between material finish rolling, steel plate control cooling stage temperature drop, it is ensured that steel plate is being controlled opening for cooling into acceleration cooling system
Beginning temperature, is conducive to obtaining the microstructure based on ULCB, so as to ensure that the mechanical property requirements of steel plate.
(2) above-mentioned production technology is adopted, without the need for special transformation being carried out to equipment, you can roll out thickness using heavy and medium plate mill
The ULCB bridge steel for 6～8mm is spent, the mechanical property of steel plate is：Yield strength ReL：500～630MPa, yield tensile ratio
ReL/ Rm≤0.83, -40 DEG C of impact absorbing energy KV2>=120J, with excellent welding performance and cold machine-shaping, steel plate is not
Pingdu is less than 3 ‰.
Description of the drawings
Metallographic structure figures of the Fig. 1 for 2 steel plate of the embodiment of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
The chemical elements in percentage by mass of the steel plate of embodiment of the present invention 1-4 as shown in table 1, balance of Fe and can not be kept away
The impurity exempted from.
The chemical composition mass percent (Wt%) of 1 embodiment of the present invention 1-4 of table
| Embodiment | C | Si | Mn | P | S | Cu | B | Ni | Mo | Cr | Nb | V | Ti | Al |
| 1 | 0.020 | 0.40 | 1.70 | 0.018 | 0.005 | 0.35 | 0.00010 | 0.15 | 0.20 | 0.45 | 0.015 | 0.060 | 0.019 | 0.015 |
| 2 | 0.055 | 0.20 | 1.40 | 0.016 | 0.003 | 0.20 | 0.00015 | 0.40 | 0.20 | 0.25 | 0.024 | 0.055 | 0.018 | 0.031 |
| 3 | 0.055 | 0.25 | 1.35 | 0.013 | 0.002 | 0.35 | 0.00020 | 0.42 | 0.18 | 0.20 | 0.028 | 0.060 | 0.010 | 0.045 |
| 4 | 0.080 | 0.10 | 1.20 | 0.008 | 0.001 | 0 | 0.00010 | 0.50 | 0.10 | 0.15 | 0.030 | 0.080 | 0.012 | 0.020 |
Various embodiments of the present invention are produced according to following steps：
(1) continuous casting billet heating (S1)：Continuous blank heating temperature is 1230 ± 20 DEG C.
(2) continuous casting billet milling (S2)：It is intermediate wood by continuous casting billet milling.Intermediate wood thickness is 60～80mm.Rolling terminates
Temperature >=1000 DEG C.
(3) intermediate wood cutting (S3)：Intermediate wood by continuous casting billet milling is long, needs according to actual finished steel plate
Order carries out cutting for designated length, so that lumber recovery is optimum.
(4) intermediate wood heating (S4)：Intermediate wood heating-up temperature is 1230 ± 20 DEG C.
(5) intermediate wood roughing (S5)：After intermediate wood goes out heating furnace, that is, high-pressure water descaling operation is carried out, is then rolled
System.Rolling started temperature is >=1070 DEG C, and rolling end temp is >=1030 DEG C.According to finished steel plate thickness, rolling is divided into 3
～4 passages, wherein 1～2 passage of broadening.Intermediate wood thickness after rolling terminates is 20～40mm.
(6) intermediate wood finish rolling (S6)：After intermediate wood roughing terminates, finishing mill is delivered to rapidly with maximum roller speed and starts essence
Roll.This delivery phase can cause steel plate to produce temperature drop, and temperature drop amplitude should be controlled at≤80 DEG C.Entrance finishing temperature is≤1020
DEG C, finish rolling end temp is 770～820 DEG C.According to finished product thickness, rolling is divided into 6～8 passages.Temperature losses of the process is controlled to 150～
200℃。
(7) steel plate control cooling (S7)：After steel plate rolling terminates, being delivered to acceleration cooling system with maximum roller speed is carried out
Control cooling, in this steel plate transfer phase, temperature drop should be controlled at≤60 DEG C.Temperature is begun to cool down for 720～760 DEG C, with 6～9
DEG C/cooldown rate of S is cooled to 520～580 DEG C, then naturally cools to room temperature in atmosphere.
(8) finished steel plate (S8)：According to order specification, steel plate is cut.
Table 2～5 is various embodiments of the present invention critical process (S4～S7) technological parameter comparative example.
The intermediate wood original depth of embodiment 1 and 2 is 60mm, and finished product nominal thickness is 6mm；The intermediate wood of embodiment 3 and 4
Original depth is 80mm, and finished product nominal thickness is 8mm.
The main technologic parameters list of 2 embodiment of the present invention 1 of table
The main technologic parameters list of 3 embodiment of the present invention 2 of table
The main technologic parameters list of 4 embodiment of the present invention 3 of table
The main technologic parameters list of 5 embodiment of the present invention 4 of table
Mechanical property list of the table 6 for the embodiment of the present invention.
6 various embodiments of the present invention performance text list of table
Wherein, the heavy and medium plate mill produced by embodiment 2 rolls the metallographic structure of ULCB class thin specification steel plate
Structure is shown in Fig. 1, and its metallographic structure is bainite.
After testing, the unevenness of steel plate is below 3 ‰.
Above-described embodiment is only most preferably enumerated, and is not the restriction to embodiments of the present invention.
Other parts not being described in detail are prior art.
Claims (7)
1. a kind of heavy and medium plate mill rolls ULCB class thin specification steel plate, it is characterised in that：The chemical composition of steel plate and
Its percentage by weight is as follows：C：0.02～0.08%, Si：0.10～0.40%, Mn：0.90～2.00%, P≤0.018%, S
≤ 0.005%, Cu≤0.40%, B≤0.0003%, Ni：0.10～0.55%, Mo：0.10～0.40%, Cr：0.12～
0.60%, V：0.030～0.090%, Nb：0.010～0.035%, Ti：0.005～0.035%, Als≤0.060%, remaining
For Fe and inevitable impurity；And while meet：V/Nb=2.0～2.7, carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+
(Ni+Cu)/15≤0.475%, welding crack sensibility indices P cm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+
Mo/15+V/10+5B≤0.23%；
The production method of the steel plate comprises the steps：Smelting, casting, continuous casting billet heating, continuous casting billet milling, intermediate wood point
Cut, intermediate wood heating, intermediate wood roughing, intermediate wood finish rolling and steel plate control it is cold；In the continuous casting billet heating stepses, thickness of strand
For 150～300mm, heating-up temperature is 1210～1250 DEG C；In the continuous casting billet milling step, by continuous casting billet milling for thickness it is
The intermediate wood of 60～80mm, rolls end temp >=1000 DEG C；In the intermediate wood heating stepses, heating-up temperature be 1210～
1250℃；In the intermediate wood roughing step, according to finished steel plate thickness, it is divided into 3～4 passages, wherein 1～2 passage of broadening, rolls
System terminates rear intermediate wood thickness for 20～40mm, and this temperature losses of the process is controlled to 10～15 DEG C；In the intermediate wood finish rolling step, root
According to finished steel plate thickness, it is divided into 6～8 passages, this temperature losses of the process is controlled to 150～200 DEG C；In the cold step of the steel plate control, open
Beginning chilling temperature is 720～760 DEG C, is cooled to 520～580 DEG C with the cooldown rate of 6～9 DEG C/S, then naturally cools to room
Temperature.
2. heavy and medium plate mill according to claim 1 rolls ULCB class thin specification steel plate, it is characterised in that：Institute
Chemical composition and its percentage by weight for stating steel plate is as follows：C：0.02～0.08%, Si：0.10～0.40%, Mn：1.20～
1.70%, P≤0.018%, S≤0.005%, Cu≤0.40%, B≤0.0003%, Ni：0.15～0.50%, Mo：0.10～
0.30%, Cr：0.15～0.60%, V：0.040～0.080%, Nb：0.015～0.030%, Ti：0.008～0.030%,
Als≤0.060%, remaining is Fe and inevitable impurity.
3. heavy and medium plate mill according to claim 2 rolls ULCB class thin specification steel plate, it is characterised in that：Institute
Chemical composition and its percentage by weight for stating steel plate is as follows：C：0.05%, Si：0.25%, Mn：1.55%, P：0.012%, S：
0.002%, Cu：0.20%, B：0.00012%, Ni：0.20%, Mo：0.15%, Cr：0.18%, V：0.050%, Nb：
0.022%, Ti：0.010%, Als：0.030%, remaining is Fe and inevitable impurity.
4. heavy and medium plate mill according to claim 1 rolls ULCB class thin specification steel plate, it is characterised in that：Institute
The mechanical property for stating steel plate is：Yield strength ReLFor 500～630MPa, yield tensile ratio ReL/ Rm≤0.83, -40 DEG C of impact absorbing energies
KV2>=120J, steel plate unevenness are less than 3 ‰, with excellent welding performance and cold machine-shaping.
5. the heavy and medium plate mill described in a kind of claim 1 rolls the production method of ULCB class thin specification steel plate, its
It is characterised by：Comprise the steps：Smelting, casting, continuous casting billet heating, continuous casting billet milling, intermediate wood cutting, intermediate wood heating,
Intermediate wood roughing, intermediate wood finish rolling and steel plate control are cold；In the continuous casting billet heating stepses, thickness of strand is 150～300mm,
Heating-up temperature is 1210～1250 DEG C；In the continuous casting billet milling step, in being 60～80mm by continuous casting billet milling for thickness
Between material, roll end temp >=1000 DEG C；In the intermediate wood heating stepses, heating-up temperature is 1210～1250 DEG C；In described
Between in material roughing step, according to finished steel plate thickness, be divided into 3～4 passages, wherein 1～2 passage of broadening, rolling terminate after in the middle of
Material thickness is 20～40mm, and this temperature losses of the process is controlled to 10～15 DEG C；In the intermediate wood finish rolling step, according to finished steel thickness of slab
Degree, is divided into 6～8 passages, and this temperature losses of the process is controlled to 150～200 DEG C；In the cold step of the steel plate control, beginning to cool down temperature is
, 520～580 DEG C are cooled to the cooldown rate of 6～9 DEG C/S, then naturally cool to room temperature by 720～760 DEG C.
6. heavy and medium plate mill according to claim 5 rolls the production method of ULCB class thin specification steel plate, its
It is characterised by：In the intermediate wood roughing step, rolling started temperature is >=1070 DEG C, and rolling end temp is >=1030 DEG C.
7. heavy and medium plate mill according to claim 5 rolls the production method of ULCB class thin specification steel plate, its
It is characterised by：In the intermediate wood finish rolling step, rolling started temperature is≤1020 DEG C, and rolling end temp is 770～840
℃。
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| CN110195192B (en) * | 2018-02-24 | 2021-03-02 | 北京交通大学 | Ultra-low carbon bainite steel, steel rail and preparation method thereof |
| CN110205565B (en) * | 2019-06-01 | 2021-08-24 | 东莞市东莞理工科技创新研究院 | Dispersion nanometer strengthened 690 steel and manufacturing method thereof |
| CN111455287B (en) * | 2020-03-30 | 2021-09-17 | 南京钢铁股份有限公司 | 500 MPa-grade low-yield-ratio weather-resistant bridge steel and manufacturing method thereof |
| CN113235004A (en) * | 2021-05-12 | 2021-08-10 | 新疆八一钢铁股份有限公司 | Production method of bridge weathering steel with optimized alloy components |
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|---|---|---|---|---|
| CN101230444A (en) * | 2008-01-02 | 2008-07-30 | 湖南华菱湘潭钢铁有限公司 | High-strength micro-alloy low-carbon bainite steel and production method thereof |
| CN104831181A (en) * | 2015-03-27 | 2015-08-12 | 武汉钢铁(集团)公司 | Liquefied petroleum gas (LPG) marine storage tank steel plate and making method thereof |
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| CN101230444A (en) * | 2008-01-02 | 2008-07-30 | 湖南华菱湘潭钢铁有限公司 | High-strength micro-alloy low-carbon bainite steel and production method thereof |
| CN104831181A (en) * | 2015-03-27 | 2015-08-12 | 武汉钢铁(集团)公司 | Liquefied petroleum gas (LPG) marine storage tank steel plate and making method thereof |
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Effective date of registration: 20180111 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Co-patentee after: CHINA RAILWAY CORPORATION Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Co-patentee before: CHINA RAILWAY CORPORATION Patentee before: Wuhan Iron & Steel (Group) Corp. |