CN102776443B - 420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof - Google Patents
420MPa-level low-alloy high-intensity ultra-thick steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention belongs to the field of ultra-thick steel plate preparation, and in particular relates to a 420MPa-level low-alloy high-intensity ultra-thick steel plate and a manufacturing method thereof. The 420MPa-level low-alloy high-intensity ultra-thick steel plate is characterized by comprising the following chemical components in percentage by mass: 0.13-0.165% of C, 0.28-0.40% of Si, 1.36-1.55% of Mn, less than or equal to 0.020% of P, less than or equal to 0.011% of S, 0.032-0.042% of Nb, 0.032-0.042% of V, less than or equal to 0.13% of Cu, less than or equal to 0.007% of N, 0.0092-0.012% of Als, less than or equal to 0.003% of O and less than or equal to 0.0002% of H, wherein the content of Nb and V is less than or equal to 0.08%, and the balance of Fe and avoidable impurities. The yield strength of the 420MPa-level low-alloy high-intensity ultra-thick steel plate can reach a 420MPa level, the tensile strength is greater than or equal to 550MPa, the elongation percentage is greater than or equal to 25%, the ballistic work of minus 20 DEG C is greater than or equal to 160J, the performances are excellent, and the application is wide.
Description
Technical field
The invention belongs to super-thick steel plate preparation field, particularly a kind of 420MPa rank low alloy high strength ultra heavy plate and manufacture method thereof.
Background technology
Develop rapidly along with modern industry, demand to all kinds of steel plates such as heavy machinofacture, pressurized vessel, boiler manufacture, military project, marine drilling platform, Nuclear power plants, mould manufacture, bridge, airport, traffic increases year by year, for reducing the manufacturing cost of various devices, these devices all trend towards maximizing, and then also increasing for manufacturing the demand of large substance spy thick (the being greater than 100mm) steel plate that these large-scale plants must use; And for improving the safe reliability of large-scale plant, to the plate quality using, require more and more stricter.The mode of production of existing special heavy plate, except original forging method, also has popular continuous metal cast process.As converter smelting-die casting cast-rolling-thermal treatment process route, but be subject to the restriction continuous casting of technical qualification cannot produce the excessive special heavy plate of thickness.The revolving furnace continuous casting slab thickness of maximum is 390mm in the world at present, but is subject to the restriction of the inner segregation of continuous-casting converter billet and compression ratio, can only produce the special heavy plate that thickness is less than 100mm.It is less that at present domestic production surpasses the producer of 100mm Plate Steel, and most of producer produces high performance structures steel plate by forging method, cannot organize production in enormous quantities, and production efficiency is very low, and the cost of becoming a useful person is higher.
Summary of the invention
What the present invention will solve is that technical problem is the deficiency existing for prior art, and a kind of 420MPa rank low alloy high strength ultra heavy plate and manufacture method thereof of excellent performance is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of 420MPa rank low alloy high strength ultra heavy plate, it is characterized in that: its chemical composition and mass percentage content are: C:0.13～0.165%, Si:0.28～0.40%, Mn:1.36～1.55%, P :≤0.020%, S :≤0.011%, Nb:0.032～0.042%, V:0.032～0.042%, Cu :≤0.13%, N :≤0.007%, Als:0.0092～0.012%, 0 :≤0.003%, H :≤0.0002%, Nb+V≤0.08% wherein, all the other are Fe and inevitable impurity.
Press such scheme, described 420MPa rank low alloy high strength ultra heavy plate thickness is 100～160mm.
The manufacture method of above-mentioned 420MPa rank low alloy high strength ultra heavy plate, is characterized in that: it comprises the following steps:
(1) electric arc furnace smelting, then through ladle refining furnace refining treatment, then continuous casting casting obtains the continuous cast billet that thickness is no less than 150mm after vacuum oven is processed;
(2) using continuous cast billet welding and welding square billet as mother metal, be consumable electrode, form consumable electrode loop, in electroslag furnace, carry out slab electric slag refusion and smelting, in remelting, make inside steel billet A, B, C, D type impurity total amount be no more than 1.0 grades and do not allow to occur that A, B two classes are mingled with, and gas content meet [O]≤30ppm, [N]≤70ppm, [H]≤2ppm;
(3) 1200 ℃～1260 ℃ thermal pretreatment, then carry out two-stage control rolling, wherein: 1070 ℃～1180 ℃ of first stage start rolling temperatures; 860 ℃～900 ℃ of subordinate phase start rolling temperatures, 830 ℃～860 ℃ of finishing temperatures;
(4) adopt Mulpic to accelerate cooling, control final cooling temperature at 580 ℃～620 ℃; Rate of cooling is 4～9 ℃/s;
(5) adopt normalizing thermal treatment, Heating temperature is 860 ℃～900 ℃, and be 150～260min heat-up time.
Press such scheme, described ladle refining furnace is treated to: add quickened lime to carry out desulfurization dephosphorization processing; Add silico-calcium or ferrosilicon powder to carry out deoxidation and alloying processing.
Press such scheme, during described ladle refining furnace is processed: described quickened lime adds according to 35～60Kg/ ton steel; Described silico-calcium or ferrosilicon powder add according to 0.02～0.04Kg/ ton steel.
Press such scheme, described vacuum oven is treated to: be blown into argon gas according to 80～100ml/ minute, and control vacuum tightness and be no more than 67Pa, keep vacuum-treat to be no less than 25 minutes.
Press such scheme, during described continuous casting, casting speed is controlled at 1.6～1.7 ms/min.
Press such scheme, the continuously cast bloom that described continuous casting casting obtains is of a size of 150mm (thick) * 150mm (wide) * 4500mm (length).
Press such scheme, in described step (2): described pre-melted slag packs in the crystallizer of electroslag furnace according to 15～25Kg/ ton steel; Described stripping speed control is in 3.5～4.5 mm/min, and carries out slow cooling in stripping simultaneously; When consumable electrode is melted to when length remains 300～350 millimeters, carry out feeding, control stripping speed in 6.5～7.5 mm/min, until remelting finishes to obtain section electroslag base simultaneously.
Press such scheme, 8 ℃ of heating rate in described step (3) thermal pretreatment/min～11 ℃/min; The rolling pass of described first stage is 4～6 passages, and total reduction is 50～70%, and the workpiece thickness after rolling is 1.3-1.4 times; The rolling pass of described subordinate phase is 4～6 passages, total reduction 30%～50%.
Press such scheme, the ratio of water up and down in described step (4) Mulpic accelerating cooling process is controlled between 1.2～1.35.
The reason of each component effect and control in the present invention:
C:C is one of element of indispensable raising steel strength in steel, the every increase of C content 0.10wt%, and tensile strength approximately improves 60MPa, and yield strength approximately improves 20～30MPa.Along with the increase of C content, steel grade Fe3C increases, and the tensile strength of steel and yield strength can improve, and plasticity and toughness index can decline, welding property variation.And this steel grade not only requires certain intensity, mainly need excellent toughness index and welding property.So regulation C content is on the low side, under be limited to 0.13%, be above limited to 0.165%.Within the scope of this, not only guaranteed the intensity of steel and be applicable to production operation, more guaranteed the use properties of this steel grade.
Si:Si mainly improves steel strength with solution strengthening form, is also the deoxidant element in steel.But if Si content is higher in steel, can cause that reduction of area declines, particularly impact toughness decreased is obvious, simultaneously also unfavorable to the welding property of steel, therefore Si content is chosen in to 0.28%～0.40%.
Mn: guaranteeing that aspect the intensity and toughness of steel, Mn is indispensable element.Less for this steel grade precious alloy element interpolation, need to suitably carry high Mn content, therefore the content of Mn is chosen in to 1.36～1.55%.
P, S: controlling P≤0.020%, S≤0.011%, is owing to only having smelting Clean Steel, the over-all properties of guarantee steel of the present invention.
Nb:Nb element has strong restraining effect to austenite recrystallization, makes can at higher temperature, carry out controlled rolling containing Nb steel, for high temperature rolling provides condition.But during too high levels, also will generate ferrite δ phase or other fragility phase, and make its toughness drop, hot workability degenerates.Therefore controlling Nb content range for the ultra-thick plate of this steel grade is 0.032～0.042%.
V:V element is can Grain refinement strong, improves intensity and the toughness of steel, reduces superheated susceptivity, improves thermostability.But too high decarburization and the graphited effect that can hinder steel of V.For the ultra-thick plate of this steel grade, need to control V content range is 0.032～0.042%.
Cu:Cu content is controlled at≤and 0.13%, be because Cu is austenite former, when expanding austenite phase region, also in drawing process, promoted austenitic formation and stabilization.The existence of a small amount of Cu can obviously improve the corrosion potential of steel, thereby improves the corrosion resistance nature of steel.Simultaneously when the content of Cu acquires a certain degree, but the precipitate of ε-Cu can improve the intensity of steel plate. and the content of Cu higher than 0.13% time, can cause the hot-short phenomenon of steel, worsens plate surface quality.
Als: in steel, can form sour molten aluminium (Als) and sour insoluble aluminium adding of Al, and Als comprises solid solution aluminium and AlN, and the AlN particle of disperse can stop growing up of austenite crystal, crystal grain thinning, so Als minimum content is controlled at 0.0092%.But for aluminium killed steel, along with the increase of Als, the amount of inclusions of steel increases, inclusion size also will become greatly, will cause the decline of internal quality of steel plate, so the high-content of Als is controlled at 0.012%.
N: steel grade N element is larger for the Toughness of steel plate, has therefore done the restriction of the upper limit, controls N≤0.007% in steel.
O:O element remains in steel ingot or is diffused into metal surface, easily make grain boundary oxidation and form the interlayer oxide of fragility, austenite crystal is completely cut off and come, to such an extent as to cause intergranular crack in deformation processing subsequently, thereby armor plate strength and plasticity are obviously declined, therefore control as far as possible the content of O.
H: the existence of protium can reduce the content of carbon, and can produce white point, therefore control the content of H as far as possible.
Major advantage of the present invention:
(1) the present invention in conjunction with the deficiencies in the prior art specially designed new technology route, the electric slag refusion and smelting method particularly wherein adopting can reduce the content of gas and inclusion in steel, obtain composition evenly, the steel ingot of dense structure, good quality, make its plasticity and toughness, particularly lateral performance is improved, reduced anisotropy, elimination has alleviated various macroscopic views and microscopic defect, the restriction of compression ratio while having reduced thus steel plate rolling, and the production efficiency that can greatly improve ultra-thick plate, effectively reduces costs;
(2) 420MPa rank low alloy high strength ultra heavy plate purity provided by the invention is high, sulphur content is low, non-metallic inclusion is few, surface of steel ingot is smooth, crystallization even compact, metal structure and chemical composition evenly, excellent performance, thickness can reach 100-160mm, yield strength can reach 420MPa rank, tensile strength >=550MPa, unit elongation >=25%,-20 ℃ of ballistic work >=160J, and can produce in batches, product competitiveness promoted.
Accompanying drawing explanation
Fig. 1 is the thickness 1/2 interior tissue figure of place of the Q420 grade high-strength degree low-alloy 160mm thickness steel plate for preparing of the embodiment of the present invention 1.
Embodiment
Embodiment 1
A kind of 420MPa rank low-alloy high-strength 160mm thickness steel plate, its chemical composition and mass percentage content are in Table 1, be specially: C:0.156%, Si:0.32%, Mn:1.52%, P:0.016%, S:0.0102%, Nb:0.032%, V:0.040%, Cu:0.11%, N:0.0061%, Als:0.012%, O:0.0023%, H:0.00013%, surplus is Fe and inevitable impurity.Concrete preparation method is as follows:
(1) according to predetermined composition, adopt electric arc furnace smelting, then through ladle refining furnace refining treatment, described ladle refining furnace (LF stove) adds quickened lime to carry out desulfurization dephosphorization processing according to 40Kg/ ton steel in processing, and according to 0.02Kg/ ton steel, adds silicon calcium powder to carry out deoxidation and alloying processing; Through vacuum oven, process, described vacuum oven is treated to again: be blown into argon gas according to 80ml/ minute, and control vacuum tightness and be no more than 67Pa, keep vacuum-treat to be no less than 25 minutes; Finally casting speed is controlled to the continuous cast billet that 1.6～1.7 ms/min of continuous casting casting obtain 150mm (thick) * 150mm (wide) * 4500mm (length);
(2) using above-mentioned strand welding and welding square billet as mother metal, be consumable electrode, pre-melted slag is packed in the crystallizer of electroslag furnace according to 15Kg/ ton steel, form consumable electrode loop, in electroslag furnace, carry out slab electric slag refusion and smelting, in refusion and smelting by stripping speed control in 3.5 mm/min, when being melted to 300～350 millimeters of length residues, consumable electrode carries out feeding, and the now stripping speed of controlling in 6.5 mm/min until remelting finishes and continues slow cooling, casting obtains the section electroslag base of 320mm * 2000mm * L, control inside steel billet A (sulfide-based), B (alumina type), C (silicates), D class (spherical oxide class) inclusion total amount is no more than 1.0 grades and do not allow to occur A, B two classes are mingled with, and gas content meets [O]≤30ppm, [N]≤70ppm, [H]≤2ppm, wherein: A, B, C, each inclusion content of D class and total amount and gas content are specifically in Table 2,
(3) with the heating rate of 8 ℃/min, in 1210 ℃ of thermal pretreatment, then carry out two-stage control rolling, wherein: 1146 ℃ of first stage start rolling temperatures, finishing temperature is 1120 ℃, rolling pass is 5 passages, total reduction is 56%, and the workpiece thickness after rolling is 1.3-1.4 times; 870 ℃ of subordinate phase start rolling temperatures, 830 ℃ of finishing temperatures, rolling pass is 4 passages, total reduction 43%;
(4) adopt Mulpic to accelerate cooling, final cooling temperature is controlled at 580 ℃, and upper and lower water ratio is controlled at 1.2, and 4 ℃/s of rate of cooling, specifically in Table 5.
(5) adopt normalizing thermal treatment, Heating temperature is 894 ℃, and be 210min heat-up time, specifically in Table 3.
The mechanical property of the 420MPa rank low-alloy high-strength 160mm thickness steel plate preparing is thus in Table 6, and Fig. 1 is shown in by steel plate inner thickness 1/2 place's organization chart.As seen from Figure 1: ultra-thick plate thickness 1/2 place producing through electroslag remelting process is organized as most of perlite and a small amount of acicular ferrite, and internal structure tissue is excellent, and comprehensive mechanical property is excellent.
Embodiment 2-4
With reference to the method for embodiment 1, according to the design of chemical composition content and each 420MPa rank low-alloy high-strength of the corresponding preparation of processing condition 160mm thickness steel plate of table 1 and table 3, table 5 light plate, the mechanical property preparing is thus in Table 6.In another embodiment 2-4, the contrast of inside steel billet quality comprises inside steel billet inclusion and gas content, as shown in table 2.
Embodiment 5
A 420MPa rank low-alloy high-strength 100mm thickness steel plate, its chemical composition and mass percentage content are in Table 1.Concrete preparation method is as follows:
(1) according to predetermined composition, adopt electric arc furnace smelting, then through ladle refining furnace refining treatment, described ladle refining furnace adds quickened lime to carry out desulfurization dephosphorization processing according to 60Kg/ ton steel in processing, and according to 0.04Kg/ ton steel, adds silicon calcium powder to carry out deoxidation and alloying processing; Through vacuum oven, process, described vacuum oven is treated to again: be blown into argon gas according to 100ml/ minute, and control vacuum tightness and be no more than 67Pa, keep vacuum-treat to be no less than 25 minutes; Finally casting speed is controlled to the continuous cast billet that 1.6～1.7 ms/min of continuous castings obtain 150mm (thick) * 150mm (wide) * 4500mm (length);
(2) using above-mentioned strand welding and welding square billet as mother metal, be consumable electrode, pre-melted slag is packed in the crystallizer of electroslag furnace according to 15Kg/ ton steel, form consumable electrode loop, in electroslag furnace, carry out slab electric slag refusion and smelting, in refusion and smelting by stripping speed control in 4.5 mm/min, when being melted to 300～350 millimeters of length residues, consumable electrode carries out feeding, and the now stripping speed of controlling in 7 mm/min until remelting finishes and continues slow cooling, casting obtains section electroslag base, control inside steel billet A, B, C, D type impurity total amount is no more than 1.0 grades and do not allow to occur A, B two classes are mingled with, and gas content meets [O]≤30ppm, [N]≤70ppm, [H]≤2ppm, wherein: A, B, C, each inclusion content of D class and total amount and gas content are specifically in Table 2,
(3) with the heating rate of 11 ℃/min, in 1260 ℃ of thermal pretreatment, then carry out two-stage control rolling, wherein: 1152 ℃ of first stage start rolling temperatures, finishing temperature is 1112 ℃, rolling pass is 6 passages, total reduction is 52%, and the workpiece thickness after rolling is 1.3-1.4 times; 875 ℃ of subordinate phase start rolling temperatures, 842 ℃ of finishing temperatures, rolling pass is 4 passages, total reduction 35%;
(4) adopt Mulpic to accelerate cooling, final cooling temperature is controlled at 612 ℃, and upper and lower water ratio is controlled at 1.26, and 6.2 ℃/s of rate of cooling, specifically in Table 5.
(5) adopt normalizing thermal treatment, Heating temperature is 895 ℃, and be 162min heat-up time, specifically in Table 3.
The mechanical property of the 420MPa rank low-alloy high-strength 100mm thickness steel plate preparing is thus in Table 6.
In addition, to adopt ordinary process to utilize 130t converter smelting, continuous casting becomes the continuously cast bloom after 300mm, according to the rolling on milling train of processing condition described in table 4, the chemical constitution of common Q 345 level steel plate of producing through process of thermal treatment mode and the contrast of the quality of inside steel billet comprise inside steel billet inclusion and gas content, and final mechanical property of steel plate is listed in respectively table 1, table 2 and table 6.
The chemical composition of table 1 example special heavy plate (mass percent, %)
Table 2 inside steel billet inclusion and gas content contrast
Table 3Q420 rank ultra-thick plate rolling and system of heat treatment process
The Q345D hot rolling of table 4 ordinary steel and system of heat treatment process
Table 5 process for cooling significant parameter is controlled
The contrast of table 6 mechanical properties test result
Claims (8)
1. a 420MPa rank low alloy high strength ultra heavy plate, it is characterized in that: its chemical composition and mass percentage content are: C:0.13～0.165%, Si:0.28～0.40%, Mn:1.36～1.55%, P :≤0.020%, S :≤0.011%, Nb:0.032～0.042%, V:0.032～0.042%, Cu :≤0.13%, N :≤0.007%, Als:0.0092～0.012%, O :≤0.003%, H :≤0.0002%, Nb+V≤0.08% wherein, all the other are Fe and inevitable impurity;
Its manufacture method comprises the following steps:
(1) electric arc furnace smelting, then through ladle refining furnace refining treatment, then continuous casting casting obtains the continuous cast billet that thickness is no less than 150mm after vacuum oven is processed;
(2) using continuous cast billet welding and welding square billet as mother metal, be consumable electrode, form consumable electrode loop, in electroslag furnace, carry out slab electric slag refusion and smelting, in remelting, make inside steel billet A, B, C, D type impurity total amount be no more than 1.0 grades and do not allow to occur that A, B two classes are mingled with, and gas content meet [O]≤30ppm, [N]≤70ppm, [H]≤2ppm;
(3) 1200 ℃～1260 ℃ thermal pretreatment, then carry out two-stage control rolling, wherein: 1070 ℃～1180 ℃ of first stage start rolling temperatures; 860 ℃～900 ℃ of subordinate phase start rolling temperatures, 830 ℃～860 ℃ of finishing temperatures;
(4) adopt Mulpic to accelerate cooling, control final cooling temperature at 580 ℃～620 ℃; Rate of cooling is 4～9 ℃/s;
(5) adopt normalizing thermal treatment, Heating temperature is 860 ℃～900 ℃, and be 150～260min heat-up time;
In described step (2): pre-melted slag packs in the crystallizer of electroslag furnace according to 15～25Kg/ ton steel; Stripping speed control is in 3.5～4.5 mm/min, and carries out slow cooling in stripping simultaneously; When consumable electrode is melted to when length remains 300～350 millimeters, carry out feeding, control stripping speed in 6.5～7.5 mm/min, until remelting finishes to obtain section electroslag base simultaneously.
2. 420MPa rank low alloy high strength ultra heavy plate according to claim 1, is characterized in that: described 420MPa rank low alloy high strength ultra heavy plate thickness is 100～160mm.
3. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 1, is characterized in that: it comprises the following steps:
(1) electric arc furnace smelting, then through ladle refining furnace refining treatment, then continuous casting casting obtains the continuous cast billet that thickness is no less than 150mm after vacuum oven is processed;
(2) using continuous cast billet welding and welding square billet as mother metal, be consumable electrode, form consumable electrode loop, in electroslag furnace, carry out slab electric slag refusion and smelting, in remelting, make inside steel billet A, B, C, D type impurity total amount be no more than 1.0 grades and do not allow to occur that A, B two classes are mingled with, and gas content meet [O]≤30ppm, [N]≤70ppm, [H]≤2ppm;
(3) 1200 ℃～1260 ℃ thermal pretreatment, then carry out two-stage control rolling, wherein: 1070 ℃～1180 ℃ of first stage start rolling temperatures; 860 ℃～900 ℃ of subordinate phase start rolling temperatures, 830 ℃～860 ℃ of finishing temperatures;
(4) adopt Mulpic to accelerate cooling, control final cooling temperature at 580 ℃～620 ℃; Rate of cooling is 4～9 ℃/s;
(5) adopt normalizing thermal treatment, Heating temperature is 860 ℃～900 ℃, and be 150～260min heat-up time;
In described step (2): pre-melted slag packs in the crystallizer of electroslag furnace according to 15～25Kg/ ton steel; Stripping speed control is in 3.5～4.5 mm/min, and carries out slow cooling in stripping simultaneously; When consumable electrode is melted to when length remains 300～350 millimeters, carry out feeding, control stripping speed in 6.5～7.5 mm/min, until remelting finishes to obtain section electroslag base simultaneously.
4. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 3, is characterized in that: described ladle refining furnace is treated to: add quickened lime to carry out desulfurization dephosphorization processing; Add silico-calcium or ferrosilicon powder to carry out deoxidation and alloying processing.
5. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 4, is characterized in that: during described ladle refining furnace is processed: described quickened lime adds according to 35～60Kg/ ton steel; Described silico-calcium or ferrosilicon powder add according to 0.02～0.04Kg/ ton steel.
6. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 3, it is characterized in that: described vacuum oven is treated to: according within 80～100ml/ minute, being blown into argon gas, and control vacuum tightness and be no more than 67Pa, keep vacuum-treat to be no less than 25 minutes.
7. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 3, it is characterized in that: during described continuous casting, casting speed is controlled at 1.6～1.7 ms/min, the continuously cast bloom that described smelting obtains be of a size of 150mm thick * 150mm is wide * 4500mm is long.
8. the manufacture method of 420MPa rank low alloy high strength ultra heavy plate according to claim 3, is characterized in that: the ratio of water up and down in described step (4) Mulpic accelerating cooling process is controlled between 1.2～1.35.
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| RU2505618C1 (en) * | 2012-12-04 | 2014-01-27 | Закрытое акционерное общество "Омутнинский металлургический завод" | Low-alloy structural steel with increased strength |
| CN103008595A (en) * | 2012-12-30 | 2013-04-03 | 南阳汉冶特钢有限公司 | Process for rolling 170 mm specification of flaw detection satisfying steel plate with 300 mm section |
| CN104894473A (en) * | 2015-06-18 | 2015-09-09 | 武汉钢铁(集团)公司 | Shrunk-on vessel steel with thickness larger than or equal to 120 mm and production method of shrunk-on vessel steel |
| CN109722601A (en) * | 2019-03-17 | 2019-05-07 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of the super-thick steel plate Q420E of low-carbon-equivalent |
| CN112453337B (en) * | 2021-02-02 | 2021-04-27 | 北京钢研高纳科技股份有限公司 | Preparation method of high-aluminum-titanium-content powder high-temperature alloy electrode bar |
| CN114603257A (en) * | 2022-04-07 | 2022-06-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Low alloy steel with yield strength of 420Mpa grade and splicing method |
| CN117210752B (en) * | 2023-08-25 | 2024-12-03 | 鞍钢股份有限公司 | High-strength steel plate for supporting pressurized water reactor nuclear power station and manufacturing method thereof |
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