CN105063511A - 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, refer to a kind of plate mill rolling ULCB class thin specification steel plate and production method thereof particularly.
Background technology
In Bridge Steel field, along with the raising of steel grade intensity rank, the organization type of steel is changed to ULCB by ferrite+perlite gradually.ULCB tissue belongs to a kind of middle temperature transformation tissue, has the features such as intensity is high, good toughness, easy welding, promotes gradually in Bridge Steel field.In some bridge construction, it is desirable to adopt ultra-low-carbon bainite steel on bridge U-rib, and the thickness of U rib steel plate is generally 6mm or 8mm.ULCB steel sheet adopts hot continuous rolling process rolling usually, but this technique comprises reeling machine rolling process, carry out again when follow-up use winding off flat technique, this technique have accumulated a large amount of unrelieved stresss aborning, in the operation such as itemize, milling limit, bending, welding of U rib manufacture, unrelieved stress can discharge, and causes steel plate generation side sway, distortion etc. to affect the problem of scantling precision.If adopt plate mill to produce, owing to not having curling aborning and opening equality operation, thus unrelieved stress is less, when processing and manufacturing, scantling precision easily ensures, but this technique exists very large production difficulty, wherein most distinct issues are exactly the control of temperature and plate shape when producing.
Publication number is in the Chinese invention patent " a kind of 6mm steel plate rolling technique " of CN101259482A, application discloses that a kind of 6mm steel plate rolling technique, do not cool fast after this technique light plate rolls, the steel plate of ferrite+pearlitic structure type can only be produced, control difficulty lower, but its intensity is lower.
Publication number be CN103469066A Chinese invention patent " a kind of utilize plate mill to produce high-mouldability energy steel plate method and obtained steel plate " in, the steel plate that embodiment is enumerated all requires cooling control after rolling, also can only produce the steel plate of ferrite+pearlitic structure type.
Publication number is in the Chinese invention patent " 2800mm Stand Mill plate mill Limit specifications steel plate rolling technique " of CN102688884A, for Ultra-thin steel plate, do not require cooling control after rolling, its illustration enumerated also is the Q345B steel of ferrite+pearlitic structure type.
Publication number is in the Chinese invention patent " a kind of manufacture method of As rolled Thin Specs high strength bridge plate " of CN104264062A, application discloses that a kind of method of rolling thin specification steel plate, illustration in embodiment is 8mm thickness steel plate, organizing of its steel plate is not ferrite+perlite type, but acicular ferrite+granular bainite, but it is comparatively tight to the content requirement of P, control P content≤0.013%, and require the V element of interpolation 0.02 ~ 0.04%, obviously increase smelting cost.In addition, this patent is indefinite to rolled blank gauge lattice, but in an embodiment, sotck thinkness is 220mm, when rolling 8mm thickness steel plate, finished steel plate length can be caused at more than 30m, make steel plate temperature homogeneity in the longitudinal direction be difficult to ensure, and then affect the homogeneity of mechanical property of steel plate.
Publication number is in the Chinese invention patent " a kind of production technique of Stand Mill plate mill Thin Specs pipe line steel " of CN102671941A, claims do not have the organization type of clear and definite steel plate, but be X70 pipe line steel in embodiment, although the organization type of this steel is not ferrite+perlite, but the thickness of clear and definite slab is 180mm in claim 1, this makes the production of steel be subject to the restriction of slab thickness.And the mode that this technology adopts thick steel billet to be once rolled down to the end is produced, the length of finished steel plate also can be made oversize and cause temperature homogeneity difficulty to move guarantee, and then affecting mechanical property of steel plate and plate shape.
Therefore, provide a kind of there is good mechanical property, excellent welding property and cold machine-shaping, the little plate mill rolling ULCB class thin specification steel plate of roughness of product and production method thereof to have important practical significance.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of plate mill rolling ULCB class thin specification steel plate and production method thereof are provided.
For achieving the above object, the technical solution used in the present invention is: a kind of plate mill rolling ULCB class thin specification steel plate, chemical composition and the weight percent thereof of steel plate are 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%, all the other are Fe and inevitable impurity, and meet: V/Nb=2.0 ~ 2.7, simultaneously 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%.
Further, chemical composition and the weight percent thereof of steel plate 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%, all the other are Fe and inevitable impurity.
Further, the chemical composition of steel plate and weight percent 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%, all the other are Fe and inevitable impurity.
In 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 improving hardness of steel, when content is more than 0.08%, when speed of cooling is larger after rolling, easily forms M/A island, and easily Assembled distribution, on segregation band, causes mechanical property of steel plate to present significantly vertical lateral variation; When its content is lower, as being less than 0.02%, armor plate strength can being made not enough, also can increase difficulty during smelting simultaneously.Therefore, controlling carbon content scope is: 0.02 ~ 0.08%.
Silicon (Si): silicon is conventional reductor, has admittedly molten strengthening effect, is conducive to improving its over-all properties, but when Si content is higher, reduces the toughness of steel, plasticity and ductility, easily causes cold short being unfavorable for be welded.Therefore, the content target value of Si controls 0.10 ~ 0.40% by the present invention.
Manganese (Mn): manganese is important highly malleablized element, can increase austenitic stability, expands γ phase region austenite, promotes the middle temperature structural transformation of steel.Mn content is too high has disadvantageous effect to steel billet center segregation, impairs the toughness of steel plate, and easily cracks when welding, and Mn content is too low, warm structural transformation in can not effectively promoting, easily reduces the intensity of steel.Therefore control Mn content range is: 0.90 ~ 2.00%.
Phosphorus (P): phosphorus is harmful element in steel, its content will strictly control, and high P content can increase the cold short tendency of steel, and P is very easily in the heart portion segregation of steel billet, the strong segregation line high due to this P content is more crisp, makes easily to produce latent defect after steel rolling.Phosphorus content of the present invention controls as P≤0.018%.
Sulphur (S): sulphur is harmful element in steel, high S content not only can make steel plate indulge lateral performance and produce notable difference, also reduces its low-temperature flexibility and Z-direction performance simultaneously.Sulphur content of the present invention is S≤0.005%.
Copper (Cu): copper can improve its hardening capacity in steel, mainly plays solid solution and precipitation strength effect, is conducive in addition obtaining good low-temperature flexibility, increases its fatigue crack extended capability; But when its add-on is greater than 0.40%, the welding heat influence area toughness of steel plate can reduce, and steel billet easily produces check crack in heat-processed.Copper content control of the present invention is Cu≤0.40%.
Boron (B): boron can improve the hardening capacity of steel, but content increases and can increase crack sensitivity to Grain Boundary Segregation.The content controlling boron in the present invention is B≤0.0003%.
Nickel (Ni): nickel can improve hardening capacity, has certain strengthening effect, can significantly improve its low-temperature flexibility, and base material and Low Temperature Impact Toughness of Heat-affected Zone are increased substantially, and Ni effectively can also stop the hot-short check crack caused of Cu simultaneously.When its add-on is less than 0.10%, then Ni does not have effect, but too high levels easily causes steel-plate iron oxide scale to be difficult to come off and increases the cost of steel.Ni content of the present invention is: 0.10 ~ 0.55%.
Molybdenum (Mo): molybdenum can make ferrite separate out from austenite and increase austenitic stability, have strong inhibition, but Mo belongs to noble element to pearlitic formation, and excessive Mo will improve the cost of steel; Too high Mo content can make the low-temperature flexibility of steel significantly worsen simultaneously, forming martensite, causing welding joint fragility to increase when welding.Therefore controlling Mo content range in steel is: 0.10 ~ 0.40%.
Chromium (Cr): chromium can improve intensity and the hardness of steel, but its too high levels then easily increases welding difficulty, and content is too low, effectively can not play its effect.In the present invention, the content of Cr controls to be 0.12 ~ 0.60%.
Vanadium (V) and niobium (Nb): in ultra-low-carbon bainite steel, only add a large amount of Nb, intensity can be significantly improved, because its grain refinement effect is obvious, cause yield tensile ratio higher simultaneously, therefore, in the present invention, Nb content is limited in lower level, the loss of its intensity is then by adding suitable V to ensure.In the present invention, the content of V is 0.030 ~ 0.090%.Niobium is strong carboritride forming element, can improve the austenite recrystallization temperature of steel, and austenite can be rolled under higher rolling temperature.In addition the precipitation strength effect of Nb in controlled rolling continuous cooling process, can pinning austenite crystal by the strain induced precipitate of the carbonitride of Nb, and crystal grain thinning also improves intensity and low-temperature flexibility.But when Nb content is greater than 0.035%, crystal grain thinning improves the effect of intensity clearly, but also causes its yield tensile ratio too high; When its content is less than 0.010%, do not play controlled rolling effect.Therefore control Nb content range is: 0.010-0.035%.
Titanium (Ti): titanium is carbide, can form trickle TiC particle, crystal grain thinning, can prevent intergranular corrosion phenomenon, improving welding property.Titanium content of the present invention is: 0.005 ~ 0.035%.
Aluminium (Als): aluminium is the main deoxidant element in steel, will cause the oxide inclusion of Als to increase during Als too high levels, reduces the purity of steel, is unfavorable for the toughness of steel.The fusing point of Als is higher, and aborning, Als can be used for stoping grain growth.Controlling titanium content in the present invention is Als≤0.060%.
Further, the mechanical property of steel plate of the present invention is: yield strength R
eLbe 500 ~ 630MPa, yield tensile ratio R
eL/ Rm≤0.83 ,-40 DEG C of impact absorbing energy KV
2>=120J, steel plate roughness is less than 3 ‰, has excellent welding property and cold machine-shaping.
The production method of above-mentioned plate mill rolling ULCB class thin specification steel plate, comprise the steps: smelting, casting, continuously cast bloom heating, continuous casting billet milling, intermediate wood cut, intermediate wood heats, intermediate wood roughing, intermediate wood finish rolling and steel plate control cold.In continuously cast bloom heating steps, thickness of strand is 150 ~ 300mm, and Heating temperature is 1210 ~ 1250 DEG C; In continuous casting billet milling step, the intermediate wood of to be thickness by continuous casting billet milling be 60 ~ 80mm, rolling end temp >=1000 DEG C; In intermediate wood heating steps, Heating temperature is 1210 ~ 1250 DEG C; In intermediate wood roughing step, according to finished steel plate thickness, be divided into 3 ~ 4 passages, wherein broadening 1 ~ 2 passage, it is 20 ~ 40mm that rolling terminates rear intermediate wood thickness, and it is 10 ~ 15 DEG C that this temperature losses of the process controls; In intermediate wood finish rolling step, according to finished steel plate thickness, be divided into 6 ~ 8 passages, it is 150 ~ 200 DEG C that this temperature losses of the process controls; In the cold step of steel plate control, beginning to cool down temperature is 720 ~ 760 DEG C, is cooled to 520 ~ 580 DEG C, then naturally cools to room temperature with the rate of cooling of 6 ~ 9 DEG C/S.
Further, in described intermediate wood roughing step, rolling starts temperature and is >=1070 DEG C, and rolling end temp is >=1030 DEG C.
Further, in described intermediate wood finish rolling step, rolling starts temperature and is≤1020 DEG C, and rolling end temp is 770 ~ 840 DEG C.
Compared with prior art, the present invention has the following advantages:
(1) the present invention is by thinning to initial continuous casting steel billet rolling and reheat the mode of rolling after cutting, reduce the length of final rolled sheet material, ensure that steel plate is along the temperature homogeneity of rolling upwards, simultaneously by controlling at intermediate wood roughing, intermediate wood finish rolling, the temperature drop in steel plate controlled cooling model stage, ensure that steel plate is entering acceleration cooling system and carry out the beginning temperature of controlled cooling model, be conducive to the microtexture obtained based on ULCB, thus ensure that the mechanical property requirements of steel plate.
(2) adopt above-mentioned production technique, without the need to carrying out special transformation to equipment, plate mill can be adopted to roll out ULCB Bridge Steel that thickness is 6 ~ 8mm, the mechanical property of steel plate is: yield strength R
eL: 500 ~ 630MPa, yield tensile ratio R
eL/ Rm≤0.83 ,-40 DEG C of impact absorbing energy KV
2>=120J, have excellent welding property and cold machine-shaping, steel plate roughness is less than 3 ‰.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of the embodiment of the present invention 2 steel plate.
Embodiment
Below in conjunction with specific embodiment, the present invention is further illustrated.
The chemical element percent mass proportioning of the steel plate of embodiment of the present invention 1-4 is as shown in table 1, and surplus is Fe and inevitable impurity.
The chemical composition mass percent (Wt%) of table 1 embodiment of the present invention 1-4
| 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) continuously cast bloom heating (S1): continuous blank heating temperature is 1230 ± 20 DEG C.
(2) continuous casting billet milling (S2): be intermediate wood by continuous casting billet milling.Intermediate wood thickness is 60 ~ 80mm.Rolling end temp >=1000 DEG C.
(3) intermediate wood is cut (S3): long by the intermediate wood of continuous casting billet milling, needs to carry out point being cut to designated length according to actual finished steel plate order, to make lumber recovery optimum.
(4) intermediate wood heating (S4): intermediate wood Heating temperature is 1230 ± 20 DEG C.
(5) intermediate wood roughing (S5): after intermediate wood goes out process furnace, namely carries out high-pressure water descaling operation, is then rolled.Rolling starts temperature and 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 broadening 1 ~ 2 passage.Intermediate wood thickness after rolling terminates is 20 ~ 40mm.
(6) intermediate wood finish rolling (S6): after intermediate wood roughing terminates, delivers to rapidly finishing mill with most big roller speed and starts finish rolling.This delivery phase can cause steel plate to produce temperature drop, and temperature drop amplitude should control at≤80 DEG C.Entrance finishing temperature is≤1020 DEG C, and finish rolling end temp is 770 ~ 820 DEG C.According to finished product thickness, rolling is divided into 6 ~ 8 passages.It is 150 ~ 200 DEG C that temperature losses of the process controls.
(7) steel plate controlled cooling model (S7): after steel plate rolling terminates, be delivered to acceleration cooling system with most big roller speed and carry out controlled cooling model, at this steel plate transfer phase, temperature drop should control at≤60 DEG C.Beginning to cool down temperature is 720 ~ 760 DEG C, is cooled to 520 ~ 580 DEG C, then naturally cools to room temperature in atmosphere with the rate of cooling of 6 ~ 9 DEG C/S.
(8) finished steel plate (S8): according to order specification, steel plate is cut.
Table 2 ~ 5 are the list of various embodiments of the present invention critical process (S4 ~ S7) processing parameter value.
The intermediate wood original depth of embodiment 1 and 2 is 60mm, and finished product nominal thickness is 6mm; The intermediate wood original depth of embodiment 3 and 4 is 80mm, and finished product nominal thickness is 8mm.
The main technologic parameters list of table 2 embodiment of the present invention 1
The main technologic parameters list of table 3 embodiment of the present invention 2
The main technologic parameters list of table 4 embodiment of the present invention 3
The main technologic parameters list of table 5 embodiment of the present invention 4
Table 6 is the mechanical property list of the embodiment of the present invention.
The list of table 6 various embodiments of the present invention Performance Detection situation
Wherein, the metallurgical structure of the plate mill rolling ULCB class thin specification steel plate that embodiment 2 is produced is shown in Fig. 1, and its metallographic structure is bainite.
After testing, the roughness of steel plate is all below 3 ‰.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Other is prior art without the part described in detail.
Claims (7)
1. a plate mill rolling ULCB class thin specification steel plate, it is characterized in that: chemical composition and the weight percent thereof of steel plate are 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%, all the other are Fe and inevitable impurity; And meet: V/Nb=2.0 ~ 2.7; simultaneously 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%.
2. plate mill rolling ULCB class thin specification steel plate according to claim 1, it is characterized in that: chemical composition and the weight percent thereof of described steel plate 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%, all the other are Fe and inevitable impurity.
3. plate mill rolling ULCB class thin specification steel plate according to claim 2, is characterized in that: chemical composition and the weight percent thereof of described steel plate 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%, all the other are Fe and inevitable impurity.
4. plate mill rolling ULCB class thin specification steel plate according to claim 1, is characterized in that: the mechanical property of described steel plate is: yield strength R
eLbe 500 ~ 630MPa, yield tensile ratio R
eL/ Rm≤0.83 ,-40 DEG C of impact absorbing energy KV
2>=120J, steel plate roughness is less than 3 ‰, has excellent welding property and cold machine-shaping.
5. a production method for plate mill rolling ULCB class thin specification steel plate according to claim 1, is characterized in that: comprise the steps: smelting, casting, continuously cast bloom heating, continuous casting billet milling, intermediate wood cut, intermediate wood heats, intermediate wood roughing, intermediate wood finish rolling and steel plate control cold; In described continuously cast bloom heating steps, thickness of strand is 150 ~ 300mm, and Heating temperature is 1210 ~ 1250 DEG C; In described continuous casting billet milling step, the intermediate wood of to be thickness by continuous casting billet milling be 60 ~ 80mm, rolling end temp >=1000 DEG C; In described intermediate wood heating steps, Heating temperature is 1210 ~ 1250 DEG C; In described intermediate wood roughing step, according to finished steel plate thickness, be divided into 3 ~ 4 passages, wherein broadening 1 ~ 2 passage, it is 20 ~ 40mm that rolling terminates rear intermediate wood thickness, and it is 10 ~ 15 DEG C that this temperature losses of the process controls; In described intermediate wood finish rolling step, according to finished steel plate thickness, be divided into 6 ~ 8 passages, it is 150 ~ 200 DEG C that this temperature losses of the process controls; In the cold step of described steel plate control, beginning to cool down temperature is 720 ~ 760 DEG C, is cooled to 520 ~ 580 DEG C, then naturally cools to room temperature with the rate of cooling of 6 ~ 9 DEG C/S.
6. the production method of plate mill rolling ULCB class thin specification steel plate according to claim 5, it is characterized in that: in described intermediate wood roughing step, rolling starts temperature and is >=1070 DEG C, rolling end temp is >=1030 DEG C.
7. the production method of plate mill rolling ULCB class thin specification steel plate according to claim 5, is characterized in that: in described intermediate wood finish rolling step, rolling starts temperature and is≤1020 DEG C, and rolling end temp is 770 ~ 840 DEG C.
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Cited By (4)
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| CN110195192A (en) * | 2018-02-24 | 2019-09-03 | 北京交通大学 | A kind of ultra-low-carbon bainite steel, rail and preparation method thereof |
| CN110205565A (en) * | 2019-06-01 | 2019-09-06 | 东莞市东莞理工科技创新研究院 | A kind of 690 steel of disperse nano reinforcement and its manufacturing method |
| CN111455287A (en) * | 2020-03-30 | 2020-07-28 | 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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| 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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| 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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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. |