CN102286693A - Thick ship plate steel and preparation method thereof - Google Patents
Thick ship plate steel and preparation method thereof Download PDFInfo
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Abstract
The invention provides thick ship plate steel and a preparation method thereof. The thick ship plate steel comprises the following components in percentage by weight: 0.09 to 0.14 percent of C, 0.15 to 0.40 percent of Si, 1.00 to 1.45 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.020 to 0.045 percent of Nb, 0.010 to 0.025 percent of Ti, 0.020 to 0.045 percent of V, 0.20 to 0.45 percent of Ni, 0.10 to 0.30 percent of Cu, 0.020 to 0.050 percent of Al and the balance of Fe and inevitable impurities. The ship plate steel produced by the method has stable performance; moreover, the production cost is low and the production efficiency is high.
Description
Technical field
The present invention relates to steel and preparation field thereof, relate in particular to a kind of thick specification deck of boat steel and preparation method thereof.
Background technology
Ship structure steel plate is one of shipbuilding industry consumption maximum, steel grade various in style.Along with development of global economy, the integration process gradually deeply, the world shipping industry is to develop rapidly, the large-tonnage ships demand increases just year by year, high-level deck of boat steel demand is more and more.Deck of boat steel has the requirement height, and characteristics such as check strictness are one of high added value steel products.Each big manufacturer is put into an important position to the production of deck of boat steel.
Traditional production technique is produced high-level deck of boat steel and be divided into two stage rolling substantially on rolling, and promptly the recrystallization zone is rolling rolling with the non-recrystallization district, the especially thick specification deck of boat.Need wait the preceding paragraph time rolling in beginning finish rolling before finish rolling after needing that roughing is rolling and finishing, the waiting time, about 1000 seconds, the purpose of wait was for rolling rolling rhythm and the production efficiency of having had a strong impact on of roughing in eliminating basically.
Chinese invention patent CN101701326A discloses a kind of super-thick high-level boat plate steel and production technique thereof in 2010.05.05 day, relate to thick steel of a kind of spy and heating process thereof, be a kind of super-thick high-level boat plate steel and normalizing process thereof, comprise following component: C:0.06%～0.18% by mass percentage, Mn:1.00%～1.60%, P :≤0.015%, S :≤0.005%, Si :≤0.35%, Ni:0.03%～0.30%, Cr:0.03%～0.20%, Cu:0.02%～0.25%, Al:0.020%～0.050%, Nb:0.010%～0.040%, V:0.003%～0.060%, all the other are Fe content.The normalizing temperature interval is 880～940 ℃, and the soaking time interval range is 0.8H～1.5H minute, and H is a steel plate thickness, and speed of cooling is 1～5 ℃/S.This invention is eliminated special heavy plate in the operation of rolling produces inside and outside some defectives such as tissue odds is even, and performance inconsistency is obvious by normalizing, improves quality product, improves competitiveness of product, has eliminated super-thick high-level boat plate steel and has organized some defectives.But this steel has added alloys such as Cr, has increased production cost, and the soaking time of normalizing simultaneously is also longer relatively, and production efficiency is lower.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of thick specification deck of boat steel and preparation method thereof, has reduced production cost, has improved production efficiency.
In order to solve the prior art problem, the invention provides a kind of thick specification deck of boat steel and preparation method thereof, by weight percentage, comprise following component: C 0.09～0.14%; Si 0.15～0.40%; Mn 1.00～1.45%; P≤0.015%; S≤0.010%; Nb 0.020～0.045%; Ti 0.010～0.025%; V 0.020～0.045%; Ni 0.20～0.45%; Cu 0.10～0.30%; Al 0.020～0.050%; And the Fe of surplus and unavoidable impurities.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, and the thickness that uses above-mentioned deck of boat steel to obtain after the rolling and finish rolling of roughing is rolling is the steel plate of 40～80mm.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, comprising:
A) according to component raw material is smelted and obtained first intermediates;
B) described first intermediates are rolled, obtain second intermediates;
C) described second intermediates are obtained deck of boat steel plate after 885～905 ℃ of following normalizings.
Preferably, described step a) is specially:
A1) add silicomanganese, middle manganese, aluminium manganese titanium, Nb iron in the molten iron after desulfurization and carry out converter smelting;
A2) molten steel behind the converter smelting is entered refining furnace, it is concise to adopt the white slag method to carry out, and adopts ferromanganese, ferrosilicon, ferro-niobium, nickel plate alloy, titanium wire, aluminum steel to carry out trimming, obtains first intermediate product.
Preferably, step b) is specially: first intermediates that obtain after b1) step a) being smelted carry out continuous casting;
B2) it is rolling the steel billet that obtains behind the continuous casting to be carried out roughing;
B3) with roughing the steel billet after rolling to carry out finish rolling at once rolling, obtain second intermediates.
Preferably, the rolling start rolling temperature of described roughing is 1100～1180 ℃.
Preferably, the rolling start rolling temperature of described finish rolling is that 1080～1160 ℃, finishing temperature are 1030～1140 ℃.
Preferably, step c) is specially:
Described second intermediates at 885～905 ℃ of following normalizing 20～30min, are obtained deck of boat steel plate after the cooling.
The sulphur content of the molten iron preferably, step a1) after the desulfurization is less than 0.020wt%.
Preferably, comprised also that before normalizing described second intermediate product is carried out water-cooled to be operated.
The invention provides a kind of thick specification deck of boat steel and preparation method thereof, comprise by weight percentage, comprise following component C 0.09～0.14%; Si 0.15～0.40%; Mn 1.00～1.45%; P≤0.015%; S≤0.010%; Nb 0.020～0.045%; Ti 0.010～0.025%; V 0.020～0.045%; Ni 0.20～0.45%; Cu 0.10～0.30%; Al 0.020～0.050%; And the Fe of surplus and unavoidable impurities.Do not contain Cr in the deck of boat steel provided by the invention, reduced the cost of product.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, and the thickness that uses above-mentioned deck of boat steel to obtain after the rolling and finish rolling of roughing is rolling is the steel plate of 40～80mm.Deck of boat steel plate thickness provided by the invention is moderate, uses anti-corrosion capability strong as the deck of boat, owing to be soft steel, contains elements such as Ti, Si, Al in the composition again, makes steel plate light weight and intensity height.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, comprising: a) according to component raw material is smelted and obtained first intermediates; B) described first intermediates are rolled, obtain second intermediates; C) described second intermediates are obtained deck of boat steel plate after 885～905 ℃ of following normalizings.Preparation method provided by the invention, to carry out finish rolling rolling the rolling back of roughing when rolling, saved the time at once; The soaking time of normalizing simultaneously is 20～30min, and uses prior art to want 32～120min.Improve production efficiency, reduced cost, be fit to large-scale industrial production.
Description of drawings
The surperficial metallographic structure figure of the deck of boat steel that Fig. 1 embodiment of the invention 1 provides;
The metallographic structure figure of heart portion of the deck of boat steel that Fig. 2 embodiment of the invention 1 provides.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment the preferred embodiments of the invention are described, but should be appreciated that just restriction of these descriptions for further specifying the features and advantages of the present invention rather than patent of the present invention being required.
The invention provides a kind of thick specification deck of boat steel and preparation method thereof, by weight percentage, comprise following component: C 0.09～0.14%; Si 0.15～0.40%; Mn 1.00～1.45%; P≤0.015%; S≤0.010%; Nb 0.020～0.045%; Ti 0.010～0.025%; V 0.020～0.045%; Ni 0.20～0.45%; Cu 0.10～0.30%; Al 0.020～0.050%; And the Fe of surplus and unavoidable impurities.
The prior art of comparing the invention provides and not contain Cr in the deck of boat steel constituent, has reduced the cost of deck of boat steel.And described deck of boat steel is soft steel, wherein contains elements such as Ti, Si, Al, makes steel plate light weight and intensity height.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, and the thickness that uses above-mentioned deck of boat steel to obtain after the rolling and finish rolling of roughing is rolling is the steel plate of 40～80mm.The thickness of deck of boat steel plate provided by the invention is 40～80mm, preferred two kinds of 〉=40～60mm and 〉=60～80mm that divide.
The present invention also provides a kind of thick specification deck of boat steel and preparation method thereof, comprising:
A) according to component raw material is smelted and obtained first intermediates;
B) described first intermediates are rolled, obtain second intermediates;
C) described second intermediates are obtained deck of boat steel plate after 885～905 ℃ of following normalizings.
The preparation method and the machined parameters of deck of boat steel plate provided by the invention are specially:
At first carry out hot metal pretreatment, hot metal pretreatment is to adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, and the content of sulphur is controlled at below 0.020% in the molten iron, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.
Carry out converter smelting then, pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control: C＜0.10%, S＜0.010%.(at first at the bottom of ladle, add the 800kg synthetic slag before the converter tapping.Adopt the deoxidation of aluminium manganese titanium, consumption 2kg/t molten steel putting steel four/for the moment, add silicomanganese, middle manganese, aluminium manganese titanium, Nb iron, preferably goes out to 3/4ths o'clock to add at molten steel.
The LF ladle refining: the molten steel behind the converter smelting enters refining furnace, and it is concise to adopt the operation of white slag method to carry out, and the white slag hold-time was greater than 12 minutes.Feed 500m～700m SiCa line in the molten steel after refining again and carry out calcification processing, and soft blow argon gas 10～20 minutes improves the molten steel cleanliness factor to remove being mingled with in the steel.Adopt ferromanganese, ferrosilicon, ferro-niobium, nickel plate alloy to carry out trimming, guarantee that composition satisfies internal control; Adjust the Ti composition with titanium wire; Adjust the Al composition with aluminum steel.
The white slag method mainly is after the slag fusing forms, and adds the CaSi powder and makes slag have reductibility, and slag is bleached.Refining slag contains CaO＞50%, in making the white slag processing, in order to quicken the slag deoxidation, also can take to add an amount of aluminum shot and carry out deoxidation.The white slag slag of making is uniform vesicle end, and with slag rod dry slag, slag blanket is even, the cooling rear surface roe shape that is white in color, and section white band grey or fine rule, and loose porous, can automatic efflorescence become white powder after the cooling.This is optimal white slag.White slag can effectively be removed steel inclusion.
More than be the preparation process of deck of boat steel, carry out continuous casting then and begin to prepare deck of boat steel plate.
Continuous casting: the whole process protection cast, covering slag adopts the medium carbon steel covering slag.For guaranteeing continuous casting billet quality, reduce crackle, two cold employings are weak cold, and the specific water takes 0.9～1.2L/Kg.This steel grade contains alloy element Nb, and crack sensitivity increases, and pays special attention to the even cooling of strand, and the control strand goes out the difference of straightening machine width surface temperature and leptoprosopy temperature less than 40 ℃.
Rolling: as to adopt two-shipper frame four roll reversing rollers to carry out roughing and finish rolling respectively:
In the roughing operation, 1100～1180 ℃ of start rolling temperatures, it is rolling to carry out 4～7 passages, and as finished product thickness: 〉=40～60mm, intermediate blank thickness is 2.5 times of finished product thickness; As finished product thickness: 〉=60～80mm, intermediate blank thickness is 2.0 times of finished product thickness; Needless to say warm after rolling, directly enter the finish rolling milling train and be rolled;
In the finish rolling operation, directly enter the finish rolling mill milling after roughing finishes, it is rolling to carry out 4～7 passages, and as finished product thickness: 〉=40～60mm, the finish rolling start rolling temperature is at 1060～1150 ℃, 1030～1120 ℃ of finishing temperatures; As finished product thickness: 〉=60～80mm, the finish rolling start rolling temperature is at 1080～1160 ℃, 1050～1140 ℃ of finishing temperatures;
Directly carry out water-cooled after finish rolling finishes: when finished product thickness: during 〉=40～60mm, opening cold temperature is 1000 ℃～1100 ℃, and final cooling temperature is 620～680 ℃, and speed of cooling is 6～8 ℃/s; As finished product thickness: 〉=60～80mm, opening cold temperature is 1040 ℃～1130 ℃, and final cooling temperature is 620～680 ℃, and speed of cooling is 5～7 ℃/s.
Heat-treat at last, as finished product thickness: 〉=40～60mm, normalizing temperature is 900 ± 5 ℃, normalizing soaking time 20min; As finished product thickness: 〉=60～80mm, normalizing temperature is 890 ± 5 ℃, normalizing soaking time 30min.
Deck of boat steel of the present invention is a kind of low alloy steel, is applicable to boats and ships, offshore platform manufacturing.Innovative point of the present invention has been to capture technical barriers such as the rhythm of production of thick intensity high-toughness ship plate steel plate with a high standard is slow, mechanical property is unstable and thickness direction tissue odds is even.
High-intensity high-tenacity deck of boat steel steel plate to the present invention's preparation is got horizontal sample along head 1/2 thickness place, in the rolling direction face pre-grinding of microscopic test machine upper edge, laboratory, polishing, corrode with nitric acid and to make metallographic specimen, under opticmicroscope, observe and measure grain fineness number, the steel matrix homogeneous microstructure is tiny, grain fineness number about 9 grades, V, Nb, Ti[C, N that disperse distributes] to change thing control desirable; Get horizontal sample along steel plate head 1/2 thickness place and be processed into the bar-shaped sample of surveying society's requirement standard, carry out tension test on 100 tons of tensile testing machines, steel plate tensile property (seeing Table 1) is stable; On the 450J trier, to requiring the impact specimen of processing to test according to surveying society, impelling strength value stabilization and surplus capacity be big (seeing Table 1), satisfies each surveying society's standard-required fully.And product Chemical Composition of the present invention is reasonable in design, and controlling of production process is simple, production efficiency height, quality product, stable performance.
Beneficial effect compared with prior art of the present invention is as follows:
The rolling rhythm of the thick specification deck of boat of high-intensity high-tenacity of the present invention steel plate is compared with common controlled rolling mode and has been improved production efficiency greatly; In the composition design, provide more accurate C, P, S span of control, simultaneously Als has also been done detailed requirement; The STEELMAKING PRODUCTION cost of alloy is lower, the stable easily control of production process, the also stable easily control of chemical ingredients.This invention has good low temperature resistant toughness owing to added the Ni element, and is somebody's turn to do invention owing to adopt the next further refinement steel plate crystal grain of the fast cold mode of water, and the alloying element that makes steel plate need reduces, and carbon equivalent is low, thereby improves welding property; The steel plate that this invention is simultaneously produced has the favorable mechanical performance, and its yield strength, tensile strength, unit elongation all are higher than currently available products.
Embodiment 1:80mmEH36 industry is rolling
1, chemical component weight per-cent is as follows:
All the other are Fe and trace impurity for C:0.10%, Si:0.27%, Mn:1.42%, S:0.004%, P:0.011%, Nb:0.030%, Ti:0.016%, V:0.045%, Ni:0.028%, Cu:0.17, Al:0.022%.
2, the manufacture method of EH36 high-intensity high-tenacity deck of boat steel, the technological process of production comprise hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, rolling.Operation steps is as follows:
Adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, molten iron sulphur is controlled at below 0.020%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control: C:0.09%, S:0.008%.At first at the bottom of ladle, add the 800kg synthetic slag before the converter tapping.Adopt the deoxidation of aluminium manganese titanium, consumption 2kg/t is being put steel four/for the moment, add silicomanganese, middle manganese, aluminium manganese titanium, Nb iron, and molten steel goes out to 3/4ths o'clock to add.Molten steel behind the converter smelting enters concise stove, and it is concise to adopt the operation of white slag method to carry out, 14 minutes LF white slag hold-times.Feeding 550m Si～Ca line carries out calcification processing in the molten steel after refining, and soft blow argon gas 14 minutes.Adopt ferromanganese, ferrosilicon, ferro-niobium, nickel plate alloy to carry out trimming, guarantee that composition satisfies internal control; Adjust the Ti composition with titanium wire; Adjust the Al composition with aluminum steel.Sheet billet continuous casting is poured into a mould by the continuous caster whole process protection.Two cold employings are weak cold, and the specific water takes 1.05L/Kg.The control strand goes out the difference of straightening machine width surface temperature and leptoprosopy temperature less than 40 ℃.
The continuously cast bloom specification is that 300mm * 1800mm * 3200mm Finished Steel specification is: 80mm*2500mm*L
Heating temperature is 1200 ℃, 4.5 hours heat-up times.Steel billet is come out of the stove, and after pre-scale breaker de-scaling, enter roughing mill and be rolled, 1170 ℃ of start rolling temperatures, it is rolling to have carried out 5 passages, every time draft is respectively: 10.7%, 8.8%, 8.5%, 13.8%, 17.3%, total draft is 46.7%, and intermediate blank thickness is 160mm.After roughing finishes, directly send into finishing mill, the finish rolling start rolling temperature is 1057 ℃, and it is rolling to have carried out 4 passages altogether, and every time draft is respectively: 11.4%, 11.1%, 10.7%, 10.3%, and total draft is 37.5%.After the rolling end, steel plate carries out water-cooled, opens 1097 ℃ of cold temperature, 655 ℃ of final cooling temperatures, speed of cooling are 7.5 ℃/s, are transported to the heat treatment department at last and carry out normalizing thermal treatment, normalizing temperature is 888 ℃, and the normalizing soaking time is 30 minutes, makes the thick high strength steel plate for ship building of 80mm at last.
The rigidity of this enforcement can be listed in the table 1.Performance test methods adopts international method.
Embodiment 2:60mmEH36 industry is rolling
1, the chemical component weight per-cent of high-intensity high-tenacity deck of boat steel is as follows:
All the other are Fe and trace impurity for C:0.14%, Si:0.35%, Mn:1.35%, S:0.002%, P:0.008%, Nb:0.035%, Ti:0.018%, V:0.041%, Ni:0.032%, Cu:0.22, Al:0.032%.
The manufacture method of high-intensity high-tenacity deck of boat steel, the technological process of production comprise hot metal pretreatment, combined blown converter smelting, LF ladle refining, soft blow argon, sheet billet continuous casting, rolling.Operation steps is as follows:
Adopt winding-up magnesium grain to carry out desulfurizing iron in iron ladle, molten iron sulphur is controlled at below 0.01%, and temperature is not less than 1250 ℃, and desulfurization finishes and scratches clean the slag on molten iron surface.Pretreated molten iron enters converter smelting, and the slag making material added in terminal point in preceding 3 minutes.Terminal point control and other process are with embodiment 1.
The continuously cast bloom specification is that 300mm * 1800mm * 3200mm Finished Steel specification is: 60mm*2500mm*L
Heating temperature is 1203 ℃, 4.5 hours heat-up times.Steel billet is come out of the stove, and after pre-scale breaker de-scaling, enter roughing mill and be rolled, 1172 ℃ of start rolling temperatures, it is rolling to have carried out 4 passages, every time draft is respectively: 12.63%, 11.63%, 18.59%, 20.82%, total draft is 50%, and intermediate blank thickness is 150mm.After roughing finishes, directly send into finishing mill, the finish rolling start rolling temperature is 1047 ℃, and it is rolling to have carried out 6 passages altogether, and every time draft is respectively: 12.79%, 14.41%, 14.56%, 14.64%, 14.41%, 13.12% total draft is 56.3%.After the rolling end, steel plate carries out water-cooled, opens 1011 ℃ of cold temperature, 645 ℃ of final cooling temperatures, speed of cooling are 7.3 ℃/s, are transported to the heat treatment department at last and carry out normalizing thermal treatment, normalizing temperature is 901 ℃, and the normalizing soaking time is 24 minutes, makes the thick high strength steel plate for ship building of 60mm at last.
The rigidity of this enforcement can be listed in the table 1.Performance test methods adopts international method.
Table 1: the mechanical property of the special thick high-strength ship plates of embodiment of the invention preparation
As can be seen from the above table, the special thick high-strength ship plates of the present invention's preparation satisfies each surveying society's standard-required fully; From the thick rolling deadline of 60mm to recently, this rolling technology is significantly smaller than the used rolling time of controlled rolling steel plate, it is obvious to improve the rolling rhythm effect.
From metallographic structure, heat treatment on microstructure is sago cycas body+perlite, textura epidermoidea is also keeping the tissue topography after the hot rolling water-cooled, crystal grain does not take place in heat treatment process in explanation grows up unusually and manifests, crystal grain is comparatively tiny, for intensity and the toughness that guarantees steel plate provides the favorable tissue basis.
More than a kind of thick specification deck of boat steel provided by the invention and preparation method thereof is described in detail; having used specific case herein sets forth principle of the present invention and embodiment; the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of claim of the present invention.
Claims (10)
1. thick specification deck of boat steel and preparation method thereof is characterized in that, by weight percentage, comprises following component: C 0.09～0.14%; Si 0.15～0.40%; Mn 1.00～1.45%; P≤0.015%; S≤0.010%; Nb 0.020～0.045%; Ti 0.010～0.025%; V 0.020～0.045%; Ni 0.20～0.45%; Cu 0.10～0.30%; Al 0.020～0.050%; And the Fe of surplus and unavoidable impurities.
2. thick specification deck of boat steel and preparation method thereof is characterized in that, using the described deck of boat steel of claim 1 thickness that rolling and finish rolling obtains after rolling through roughing is the steel plate of 40～80mm.
3. thick specification deck of boat steel and preparation method thereof is characterized in that, comprising:
A) according to the described component of claim 1 raw material is smelted and obtained first intermediates;
B) described first intermediates are rolled, obtain second intermediates;
C) described second intermediates are obtained deck of boat steel plate after 885～905 ℃ of following normalizings.
4. preparation method according to claim 3 is characterized in that, described step a) is specially:
A1) add silicomanganese, middle manganese, aluminium manganese titanium, Nb iron in the molten iron after desulfurization and carry out converter smelting;
A2) molten steel behind the converter smelting is entered refining furnace, it is concise to adopt the white slag method to carry out, and adopts ferromanganese, ferrosilicon, ferro-niobium, nickel plate alloy, titanium wire, aluminum steel to carry out trimming, obtains first intermediate product.
5. preparation method according to claim 3 is characterized in that step b) is specially: first intermediates that obtain after b1) step a) being smelted carry out continuous casting;
B2) it is rolling the steel billet that obtains behind the continuous casting to be carried out roughing;
B3) with roughing the steel billet after rolling to carry out finish rolling at once rolling, obtain second intermediates.
6. preparation method according to claim 5 is characterized in that, the rolling start rolling temperature of described roughing is 1100～1180 ℃.
7. preparation method according to claim 5 is characterized in that, the rolling start rolling temperature of described finish rolling is that 1080～1160 ℃, finishing temperature are 1030～1140 ℃.
8. preparation method according to claim 3 is characterized in that step c) is specially:
Described second intermediates at 885～905 ℃ of following normalizing 20～30min, are obtained deck of boat steel plate.
9. preparation method according to claim 4 is characterized in that step a1) in the sulphur content of molten iron after the desulfurization less than 0.020wt%.
10. preparation method according to claim 8 is characterized in that, also comprises described second intermediate product is carried out the water-cooled operation before normalizing.
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| CN111334721A (en) * | 2020-04-16 | 2020-06-26 | 山东钢铁集团日照有限公司 | Normalized rolling medium-thick ship plate steel and production method thereof for eliminating banded structure |
| CN114622137A (en) * | 2022-03-03 | 2022-06-14 | 万向钱潮股份有限公司 | Advanced high-strength steel with better fatigue performance and preparation method thereof |
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Effective date of registration: 20220610 Address after: 250000 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: Friendship Street 271104 Shandong province Laiwu City Gangcheng District No. 38 Patentee before: LAIWU STEEL Group Ltd. |
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