CN101845588A - Super-thick steel plate for construction with excellent Z-directional performance and production method thereof - Google Patents
Super-thick steel plate for construction with excellent Z-directional performance and production method thereof Download PDFInfo
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Abstract
The invention relates to a super-thick steel plate for construction with an excellent Z-directional performance, which is characterized in that the chemical composition (by weight percentage) of steel is as follows: C accounts for 0.10-0.22 percent, Si accounts for 0.10-0.50 percent, Mn accounts for 1.0-2.0 percent, P accounts for less than or equal to 0.025 percent, S accounts for less than or equal to 0.006 percent, Nb accounts for 0.01-0.06 percent, V accounts for 0.02-0.11 percent, Ti accounts for 0.005-0.025 percent, Ca accounts for 0.0004-0.0040 percent, Alt accounts for 0.01-0.05 percent, H accounts for less than or equal to 0.0002 percent, and the rest is Fe and inevitable impurities. The thickness of the steel is more than or equal to 60mm. The production of the super-thick steel plate comprises the following steps: deep desulphurization of molten iron, combined blowing on the top and bottom of a converter, refining outside the converter, die casting, blooming, reheating of a cogged ingot, free rolling, air cooling and normalizing; wherein the cogged ingot is reheated to be 1100-1250 DEG C; and the steel plate is heated to be 860-920 DEG C for normalizing. The super-thick steel plate has an excellent Z-directional performance, and can be widely applied in the constructional engineering field such as high-rise buildings, large-span stadiums and the like.
Description
Technical field
The present invention relates to steel plate for building and manufacture method thereof, particularly have super-thick steel plate for construction and the manufacture method thereof of excellent Z to performance.
Background technology
In recent years, along with buildings to maximize, complicated development, (〉=60mm) demand is more and more, simultaneously to the requirement of its inner quality also increasingly stringent to special heavy plate.In the construction of some Highrise buildingss, large span venue etc., the universal demand steel plate has good anti-lamellar tearing performance.The relative reduction in area ψ z that extensively adopts at present the thickness of slab direction in the world is as weighing the leading indicator of Z to performance, evaluation steel plate lamellar tearing susceptibility quality.Lamellar tearing is the great collapse mode of a kind of hazardness, its formation mechanism is under the effect of welding stress (Z is to stress) in simple terms, matrix metal finally causes matrix metal to tear disconnection along the stratiform step along inclusion cracking and expansion, engineering is caused the massive losses that can't retrieve.Therefore, press for a kind of special heavy plate for building in the Highrise buildings field with excellent Z-directional performance.
The manufacture method of a kind of building structure of anti-lamellar tearing excellent property with slab introduced in Japanese kokai publication hei 6-198394 patent application.This steel plate chemical ingredients is C0.01～0.20%, Si0.01～0.50%, Mn0.5～2.0%, P≤0.05%, S≤0.02%, Cu0.1～2.0%, Cr0.05～1.0%, Ni0.1～1.5%, Mo0.05～0.5%, Nb0.005～0.05%, V0.01～0.1%, Ti0.003～0.5%, B≤0.002%, Ca0.0005～0.005%, Al0.005～0.1%, REM0.001～0.02%.The document introduces by enough forging and pressing working moduluses and depresses the Z that recently the guarantees steel plate method to performance.Its weak point is to adopt in the steel plate composition design of normalizing treatment has all added alloying elements such as Cu, Ni, because the price of Ni is comparatively expensive, has improved the cost of steel plate greatly.In addition, the document also has strict requirement to the forging and pressing rate, and the forging and pressing rate of normalized steel plate is all more than 12%, and this can increase the forging equipment load on the one hand, has also increased the complicacy of production operation in addition, has reduced production efficiency.In addition, the steel plate thickness maximum of the disclosed technology normalizing treatment of the document only is 75mm.
A kind of heat treated manufacture method with building structure of excellent Z-directional performance with slab that need not has also been introduced in Japanese kokai publication hei 6-158222 patent application.The chemical ingredients of this steel plate is C≤0.20%, Si0.05～0.55%, Mn0.5～1.8%, S≤0.04%, Cu≤1.0%, Cr≤1.0%, Ni≤1.0%, Mo≤1.0%, Nb≤0.1%, V≤0.1%, Ti≤0.1%, Ca≤0.1%, Al0.005～0.10%, H≤0.00008.The weak point of document technology is in the composition design very strict to the H content requirement, requires H≤0.8ppm, and the H content that present domestic steel mill can control is minimum to be 1ppm, and the following H of 1ppm does not possess the feasibility of big production operation.In addition, H content is low more, and the required dehydrogenation treatment time can increase greatly, has had a strong impact on production efficiency.And the H content requirement among the present invention can effectively be realized this goal by refining unit below 2ppm.Adopt the method for this documents can't produce super-thick steel plate in addition, the thickness of its steel plate is below the 35mm, does not belong to the category of special heavy plate.And document technology employing controlled rolling (CR) technology, it is not high to manufacture efficient.
Summary of the invention
The present invention is intended to overcome above problem, a kind of super-thick steel plate for construction with excellent Z-directional performance is provided, such steel plate not only has excellent Z to performance, good obdurability and processing characteristicies such as welding, clod wash, add few simultaneously at steel plate production process interalloy element, big production operation is convenient, its thickness can reach more than the 60mm, particularly 75～130mm.Suitable application area comprises building engineering fields such as Highrise buildings, large span venue.
For achieving the above object, the present invention has designed a kind of super-thick steel plate for construction with excellent Z-directional performance, it is characterized in that, the chemical ingredients of steel (weight percent) is: C:0.10～0.22%, Si:0.10～0.50%, Mn:1.0～2.0%, P≤0.025%, S≤0.006%, Nb:0.01～0.06%, V:0.02～0.11%, Ti:0.005～0.025%, Ca:0.0004～0.0040%, Alt:0.01～0.05%, H≤0.0002%, surplus is Fe and inevitably is mingled with that described steel plate thickness is 〉=60mm.
Preferably, 0.0001≤H≤0.0002%.
Preferably, described thickness with super-thick steel plate for construction of excellent Z-directional performance is 75～130mm.
Advantageously, described super-thick steel plate for construction with excellent Z-directional performance, its Z is more than the Z35 to performance, that is to say that Z is more than 35% to performance.
Manufacture method with super-thick steel plate for construction of excellent Z-directional performance of the present invention comprises the steps:
The dark desulfurization of molten iron → converter top bottom blowing → external refining → die casting → breaking down → cogged ingot reheat → free rolling → air cooling → normalizing thermal treatment;
Wherein, cogged ingot reheat to 1100 ℃～1250 ℃;
Steel plate is heated to 860～920 ℃ carries out normalizing thermal treatment.
Preferably, in die casting of the present invention, the cast of whole process using blowing argon.
Preferably, in free rolling of the present invention, depress than D/d 〉=3.0.
Preferably, in free rolling of the present invention, depress than being 3.0≤D/d≤7.0.
Preferably, behind free rolling of the present invention, air cooling is to normal temperature.
Preferably, in normalizing treatment of the present invention, the normalizing time is 1.0～2.0min/mm.
The qualification reason of chemical ingredients among the present invention below is described in detail in detail:
C content is chosen in 0.10～0.22% among the present invention.Carbon is the main strengthening element in the steel, and in order to guarantee the intensity of normalized steel plate, its addition must not be lower than 0.10%; And construction(al)steel is very strict to the welding performance requriements, and carbon is the principal element of carbon equivalent calculation formula, and too high carbon content can worsen the weldability of steel plate, therefore carbon content is limited to below 0.22% preferred 0.10～0.22%.
Si content is 0.10～0.50% among the present invention.Si mainly is the intensity that improves steel with the solution strengthening form, also be simultaneously the deoxidant element in the steel, but too high levels can worsen the welding property of steel, therefore is controlled at 0.10～0.50%.
Mn content is chosen in 1.0～2.0% among the present invention.Mn mainly improves the intensity of steel by solution strengthening.Mn can enlarge the austenite phase region in addition, reduces the transition temperature of supercooled austenite, helps the refinement of phase-change organization.But Mn also is the element that increases carbon equivalent, and too high levels has disadvantageous effect to the welding property of steel.Therefore Mn content is controlled at 1.0～2.0%.
P content≤0.025% among the present invention.Low phosphorus content can make steel have good toughness and weldability, so should reduce phosphorus content among the present invention as far as possible.
S content≤0.006% among the present invention.S has bigger detrimental effect as the harmful low-temperature flexibility that is mingled with steel in the steel, the more important thing is that S combines formation MnS and is mingled with Mn, in course of hot rolling, the MnS of plasticity is mingled with along rolling to extending to form MnS inclusion band, the Z of grievous injury steel plate is to performance, therefore the S content control in the steel is low more good more, considers the factors such as operability of production control, among the present invention S content is controlled at below 0.006%.
Nb content is 0.01～0.06% among the present invention.Nb is strong carboritride forming element, improves the intensity of steel by refined crystalline strengthening and precipitation strength.When Nb content is lower than 0.01%, not enough to the strengthening effect of normalized steel plate; When Nb content is higher than 0.06%, the welding property of steel plate there is disadvantageous effect.Therefore Nb content is controlled at 0.01～0.06%.
V content is 0.02～0.11% among the present invention.V is typical precipitation strength element, combine with N in the steel and C to generate the intensity that tiny carbonitride can effectively improve steel plate, but Xiang Gangzhong adds low-temperature flexibility and welding property that excessive V worsens steel plate easily.Therefore V content is controlled at 0.02～0.11% among the present invention.
Ti content is 0.005～0.025% among the present invention.Add in the steel trace Ti can with N in conjunction with generating the high TiN particle of stability, the growing up of austenite crystal in the heat affected zone improved the weldability of steel when suppressing welding.When the Ti add-on is very few, form TiN number of particles deficiency, can not effectively suppress the grain growth of welded heat affecting zone; When adding Ti content is too much, separate out large-sized TiN in the solidification of molten steel process easily, become the starting point of crack initiation, the Z that worsens steel plate is to performance.
Ca content is 0.0004～0.0040% among the present invention.Handle by calcium and can change oxide morphology, by easily deformable strip be mingled with become on-deformable, stablize tiny spherical being mingled with, the Z that improves steel plate can also improve the low-temperature flexibility of steel in addition to performance, guarantees the isotropy of mechanical property.
Alt content is 0.01～0.05% among the present invention.The Al that adds in the steel is mainly used to deoxidation, and the fixing freedom [N] in the steel is in addition improved the low-temperature flexibility of welded heat affecting zone.When Alt was lower than 0.01% in the steel, its deoxidation effect and nitrogen fixation effect were all undesirable; When Alt is higher than 0.05% in the steel, Al
2O
3Be mingled with and increase, the Z that influences steel plate is to performance and welding property.
H content≤0.0002% among the present invention when hydrogen richness is higher in the steel, produces white point thereby assemble easily near defective and inclusion, become the fatigue cracking source of steel, and the Z of severe exacerbation steel is to performance.
High Z of the present invention is to the production method of the super-thick steel plate for construction of performance, and its typical process flow is as follows:
The dark desulfurization of molten iron → converter top bottom blowing → external refining → die casting → breaking down → slab reheat → rolling → cooling → normalizing.
Adopt the dark desulfurization of molten iron, converter top bottom blowing (control C content), RH vacuum circulation degassing technology, carrying out calcium simultaneously handles, the Chemical Composition (weight %) that obtains steel is: C:0.10～0.22%, Si.0.10～0.50%, Mn:1.0～2.0%, P≤0.025%, S≤0.006%, Nb:0.01～0.06%, V:0.02～0.11%, Ti:0.005～0.025%, Ca:0.0004～0.0040%, Alt:0.01～0.05%, H≤0.0002%, surplus are Fe and inevitably are mingled with.
The molten steel that will meet steel chemical composition requirement of the present invention carries out die casting, and the cast of whole process using blowing argon, and the steel inclusion of avoiding the oxidation of invar water to cause increases, thereby the Z of deterioration steel plate is to performance.
After smelting and cast according to above-mentioned Chemical Composition, according to following processing condition be rolled, cooling and thermal treatment: cogged ingot is heated to 1100 ℃～1250 ℃, carry out free rolling (AR is rolling), assurance is depressed than D/d 〉=3.0 (D: cogged ingot thickness, d: finished product thickness), preferred 3.0≤D/d≤7.0, air cooling is to normal temperature then, then steel plate is heated to 860～920 ℃ and carries out normalizing thermal treatment, soaking time is 1.0～2.0min/mm.
Cogged ingot heat-processed is to guarantee that all kinds of alloying elements in the steel comprise that Nb, Ti and V carbonitride are dissolved in the process in the steel.Heating temperature is lower than 1100 ℃, then can cause alloying element particularly Nb and V carbonitride can not fully dissolve, influence the function of the thin brilliant and precipitation strength of its performance, thereby can not satisfy the mechanical property requirements of steel plate; Heating temperature not only wastes energy after being higher than 1250 ℃, also can cause grain growth, influences steel strength and low temperature impact properties, even also the situation that steel plate burning and decarburization etc. are scrapped steel plate may occur.Therefore, in the present invention, it should be suitable selecting 1100～1250 ℃ Heating temperature.
Adopt controlled rolling can effectively improve the mechanical property of steel plate in the operation of rolling, but the controlled rolling process need long period treat temperature, greatly reduce production efficiency; Adopt the steel plate of composition of the present invention design in the operation of rolling, to need not Z that controlled rolling can satisfy steel plate, so adopt free rolling (AR is rolling) in the operation of rolling of the present invention to performance and mechanical property requirements.
Because subsurface defects such as the inner inevitably existence of steel ingot is loose, shrinkage cavity, if fully pressing in the operation of rolling, when steel plate is subjected to Z to stress, thereby fault location very easily becomes formation of crack and causes lamellar tearing, the Z that greatly reduces steel plate is to performance, thereby need guarantee to depress than D/d 〉=3.0; On the other hand, if depress than excessive, can cause that rolling pass increases, rolling time increases, and has reduced production efficiency.Thereby depress among the present invention than preferably being controlled at 3.0≤D/d≤7.0.
Good matrix also is to improve the effective guarantee of steel plate Z to performance.The normalizing Heating temperature is too high, when soaking time is long, cause grain growth easily, is unfavorable for the structure refinement of steel plate, also increases production cost in addition, reduces production efficiency; The normalizing Heating temperature is too low, soaking time too in short-term, steel plate is austenitizing fully, even the disadvantageous situations of organizing such as mixed crystal may occur.Therefore normalizing temperature is controlled to be 860～920 ℃ among the present invention, and soaking time is 1.0～2.0min/mm.
Make super-thick steel plate for construction according to composition design and processes of the present invention, have following advantage:
Because steel of the present invention adopts microalloy element few, easy to operate in big the production, the steel plate of production has excellent anti-lamellar tearing performance, and its Z can reach more than the Z35 to performance.
The steel thickness of producing according to the present invention can reach more than the 60mm, and particularly 75～130mm has satisfied the demand of Highrise buildings to super-thick steel plate.
Steel of the present invention has good welding property and lower yield tensile ratio, has satisfied the strict demand to the welding property and the anti-seismic performance of construction(al)steel.
Because the rolling technology of steel of the present invention adopts free rolling, does not need to carry out controlled rolling, need not time of staying temperature, therefore can enhance productivity.
Description of drawings
Figure 1A is the fracture apperance (Z=69%) that adopts the 130mm Plate Steel of the present invention's production.
Figure 1B be adopt the 130mm Plate Steel that the present invention produces fracture can spectrogram.
Fig. 2 A is the fracture apperance (Z=66%) that adopts the 65mm Plate Steel of the present invention's production.
Fig. 2 B be adopt the 65mm Plate Steel that the present invention produces fracture can spectrogram.
Fig. 3 A is the fracture apperance (Z=20%) that does not adopt the 70mm Plate Steel that the present invention produces
Fig. 3 B be do not adopt the 70mm Plate Steel that the present invention produces fracture can spectrogram.
Embodiment
According to steel chemical composition requirement of the present invention, it is C:0.10～0.22%, Si:0.10～0.50%, Mn:1.0～2.0%, P≤0.025%, S≤0.006%, Nb:0.01～0.06%, V:0.02～0.11%, Ti:0.005～0.025%, Ca:0.0004～0.0040%, Alt:0.01～0.05%, H≤0.0002%, surplus is Fe and inevitably is mingled with, adopt the Clean Steel smelting technology, carry out top bottom blowing in 300 tons of converters of steelworks, carry out external refining then, the chemical ingredients that obtains embodiment 1～8 sees Table 1, and surplus is Fe and inevitably is mingled with.
Cogged ingot is heated to 1100～1250 ℃, carry out free rolling (AR is rolling), it is 3.0≤D/d≤7.0 (D: cogged ingot thickness that assurance is depressed than D/d, d: finished product thickness), roll the back air cooling to room temperature, steel plate is heated to 860～920 ℃ at last, carries out normalizing thermal treatment, soaking time is 1.0～2.0min/mm.Final product thickness is respectively: 60mm, 70mm, 80mm, 90mm, 100mm, 120mm and 130mm, its Z sees Table 2 to performance and other mechanical properties.
Table 2 invention steel contrasts with the mechanical property of the corresponding steel grade of pertinent literature
Annotate: AR is a free rolling; CR is controlled rolling.
Z is to the mensuration of performance: according to the sampling requirement among the GB/T5313-85 " thickness directional properties steel plate ", 6 full thickness samples of end middle part intercepting in the steel plate rolling direction, 3 are processed into tension specimen (diameter d 0=10mm), and 3 are standby, with this Z that measures steel plate to performance.
Comparison by inventive embodiments in table 1, the table 2 and Comparative Examples can be found, has added after Cu, the Ni element in the composition of contrast 1, contrast 2, and Z be there is no obvious influence to performance, and because its price is more expensive, has improved the production cost of steel plate relatively.Though the adding of Cu, Ni can effectively improve the intensity and the low-temperature flexibility of steel plate, the yield tensile ratio of steel plate also improves greatly.From table, can see that the yield tensile ratio of Comparative Examples is up to 0.89, and the yield tensile ratio of embodiment of the invention light plate is below 0.72, therefore, though the adding of Cu, Ni has improved intensity, greatly reduces the anti-seismic performance of steel plate.In addition, contrast 1, contrast 2 also require control forging and pressing rate, have not only increased the load of forging equipment, have also increased the complicacy of production technique.And need not to add alloying elements such as Cu, Ni among the present invention, and simultaneously the forging and pressing rate there is not any requirement, simplified production operation, improved production efficiency.In addition, the thickness of contrast steel plate only is below the 75mm, and special heavy plate thickness maximum of the present invention can reach 130mm, and has excellent Z to performance.
Figure 1A is the fracture apperance that adopts the 130mm Plate Steel of the present invention's production, and the Z of this steel plate is Z=69% to performance.Figure 1B is the energy spectrogram of this steel plate fracture.Fig. 2 A is the fracture apperance that adopts the 65mm Plate Steel of the present invention's production, and the Z of this steel plate is Z=66% to performance, and Fig. 2 B is the energy spectrogram of this steel plate fracture.Fig. 3 A is the fracture apperance that does not adopt the 70mm Plate Steel that the present invention produces, and the Z of this steel plate is Z=20% to performance.Fig. 3 B is the energy spectrogram of this steel plate fracture.
As can be seen from the figure, the steel plate fracture apperance that adopts the present invention to produce is the dimple shape, and the dimple bottom has into particulate state or tiny globular CaS is mingled with, and this is mingled with promptly is to handle the on-deformable inclusion that forms after the sex change through calcium.And the steel plate fracture that does not adopt the present invention to produce presents the pattern of lamellar tearing, exists more strip MnS to be mingled with on the section.Because MnS is mixed in the operation of rolling very easily distortion, when steel plate receive Z to stretching action the time just be easy to tear disconnection along the MnS place of being mingled with, thereby the Z of steel plate is to poor-performing.
H content all is controlled within the 0.8ppm in the composition of contrast 3, contrast 4, in order to obtain so low hydrogen richness, certainly will will increase the dehydrogenation treatment time greatly, has had a strong impact on production efficiency.In addition, adopt the controlled rolling method in the production technique of contrast 3, contrast 4, treat in the operation of rolling that temperature can have a strong impact on production efficiency.The most important is that the steel plate maximum ga(u)ge that the method for employing contrast patent is produced only is 35mm, can't reach (60～130mm) the thickness range of special heavy plate among the present invention.
This shows that steel of the present invention adopts free rolling and normalizing process stably manufactured to have for building special heavy plate of high Z to performance by adding a spot of microalloy element.The special heavy plate that the present invention produces can be widely used in fields such as Highrise buildings, the construction of large span stadiums.
More than by embodiment the present invention has been carried out comparatively detailed explanation, but be not limited only to these embodiment, under the situation that does not break away from the present invention's design, more changeableization or improved other equivalent embodiment can also be arranged, and these changes and improvements all belong to scope of the present invention.
Claims (10)
1. super-thick steel plate for construction with excellent Z-directional performance, it is characterized in that, the chemical ingredients of the weight percent meter of steel is: C:010～0.22%, Si:0.10～0.50%, Mn:1.0～2.0%, P≤0.025%, S≤0.006%, Nb:0.01～0.06%, V:0.02～0.11%, Ti:0.005～0.025%, Ca:0.0004～0.0040%, Alt:0.01～0.05%, H≤0.0002%, surplus is Fe and inevitably is mingled with that described steel plate thickness is 〉=60mm.
2. the super-thick steel plate for construction with excellent Z-directional performance as claimed in claim 1 is characterized in that, 0.0001≤H≤0.0002%.
3. the super-thick steel plate for construction with excellent Z-directional performance as claimed in claim 2 is characterized in that, described steel plate thickness is to 130mm greater than 75.
4. as arbitrary described super-thick steel plate for construction in the claim 1～3, it is characterized in that the Z of described steel plate is more than the Z35 to performance with excellent Z-directional performance.
5. as arbitrary described manufacture method in the claim 1～4, comprise the steps: with super-thick steel plate for construction of excellent Z-directional performance
The dark desulfurization of molten iron → converter top bottom blowing → external refining → die casting → breaking down → cogged ingot reheat → free rolling → air cooling → normalizing thermal treatment;
Wherein, cogged ingot reheat to 1100 ℃～1250 ℃;
Steel plate is heated to 860～920 ℃ carries out normalizing thermal treatment.
6. the manufacture method with super-thick steel plate for construction of excellent Z-directional performance as claimed in claim 5 is characterized in that, in the die casting, and the cast of whole process using blowing argon.
7. as claim 5 or 6 described manufacture method, it is characterized in that, in free rolling, depress than D/d 〉=3.0 with super-thick steel plate for construction of excellent Z-directional performance.
8. the manufacture method with super-thick steel plate for construction of excellent Z-directional performance as claimed in claim 7 is characterized in that, in free rolling, depresses than being 3.0≤D/d≤7.0.
9. as arbitrary described manufacture method in the claim 5～8, it is characterized in that air cooling is to normal temperature with super-thick steel plate for construction of excellent Z-directional performance.
10. as arbitrary described manufacture method in the claim 5～9, it is characterized in that the normalizing treatment time is 1.0～2.0min/mm with super-thick steel plate for construction of excellent Z-directional performance.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN108642390A (en) * | 2018-05-30 | 2018-10-12 | 武汉钢铁有限公司 | The high-strength steel plate and production method of a kind of thickness directional properties Z 35 ~ 50% |
| EP3505651A4 (en) * | 2016-10-18 | 2019-10-23 | Jiangyin Xing Cheng Special Steel Works Co., Ltd | Toothed rack steel plate having thickness of 177.8 mm and manufactured by continuous casting billet and manufacturing method therefor |
-
2009
- 2009-03-24 CN CN200910048139A patent/CN101845588A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557690A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacture method of a kind of low temperature resistant and anti-lamellar tearing |
| CN107557690B (en) * | 2016-06-30 | 2019-03-26 | 鞍钢股份有限公司 | The super-thick steel plate and its manufacturing method of a kind of low temperature resistant and anti-lamellar tearing |
| EP3505651A4 (en) * | 2016-10-18 | 2019-10-23 | Jiangyin Xing Cheng Special Steel Works Co., Ltd | Toothed rack steel plate having thickness of 177.8 mm and manufactured by continuous casting billet and manufacturing method therefor |
| CN108642390A (en) * | 2018-05-30 | 2018-10-12 | 武汉钢铁有限公司 | The high-strength steel plate and production method of a kind of thickness directional properties Z 35 ~ 50% |
| CN108642390B (en) * | 2018-05-30 | 2020-05-05 | 武汉钢铁有限公司 | High-strength thick steel plate with thickness direction performance Z of 35-50% and production method thereof |
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Application publication date: 20100929 |