CN107385326A - A kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain - Google Patents

A kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain Download PDF

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CN107385326A
CN107385326A CN201710499699.4A CN201710499699A CN107385326A CN 107385326 A CN107385326 A CN 107385326A CN 201710499699 A CN201710499699 A CN 201710499699A CN 107385326 A CN107385326 A CN 107385326A
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generous
steel plate
ultra
fine grain
pipeline steel
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CN107385326B (en
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翟冬雨
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to PCT/CN2018/093096 priority patent/WO2019001464A1/en
Priority to RU2019135632A priority patent/RU2734901C1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The present invention is a kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, and the heavy percentage composition of steel plate is：C：0.040~0.070%, Si：0.15~0.30%, Mn：1.30~1.80%, P≤0.015%, S≤0.005%, Nb：0.030~0.07%, Ti：0.006~0.020%, Ca：0.0005~0.0040%, Al：0.015~0.050%, Ni：0.10~0.30%, Cr：0.10~0.30%, Mo：0.08~0.18%, Cu：0.1~0.20%, surplus is Fe and inevitable impurity；By rationally improving blank heating technique, it is preferred that rolling procedure, improve laminar flow cooling technology, ensure different deformation storage energy and crystal boundary migration rate, effective thinning microstructure grain size, obtains bainite, the acicular ferrite of even tissue, it is ensured that the stabilization of microstructure and property, meet generous Hi-grade steel Pipeline Steel Properties requirement, remarkable in economical benefits.

Description

A kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain
Technical field
The invention belongs to field of steel metallurgy, is related to a kind of production technology of Pipeline Steel Plate, and specifically one kind passes through Roll control technology improves rolled piece width 3500~5000mm, the generous wall Pipeline Steel Plate tissue grain sizes of 25~40mm of thickness life Production. art.
Background technology
Due to the supersaturation of steel market, enterprise competitiveness more tends to be white-hot, and conventional variety gross profit is more and more lower, opens It is extremely wide to send out very thin, extremely thick extremely wide kind product is into the key of enterprise's survival and development, the stability of extremely thick extremely wide varieties and characteristicses Substantial connection be present with tissue grain size.In the prior art, for 3500~5000mm of width, thickness 25~40mm pipe line steels Plate, the unfavorable factor of banded structure how is eliminated, how to make to obtain the bainite of densification, needle-like iron element at steel plate 1/4 with core Body tissue, all it is to have technical problem to be solved so as to obtain the tissue of even tissue, refined crystalline strengthening.
The content of the invention
The technical problems to be solved by the invention are, for 3500~5000mm of width, thickness 25~40mm Pipeline Steel Plates, The unfavorable factor of banded structure how is eliminated, how to make bainite, the acicular ferrite group for obtaining densification at steel plate 1/4 with core Knit, so as to obtain the tissue of even tissue, refined crystalline strengthening, improve properties of product.
The present invention solve above technical problem technical scheme be：
A kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, comprises the following steps：
(i) the heavy percentage composition of the generous Pipeline Steel Plate of ultra-fine grain is：C：0.040~0.070%, Si：0.15~0.30%, Mn： 1.30~1.80%, P≤0.015%, S≤0.005%, Nb：0.030~0.07%, Ti：0.006~0.020%, Ca：0.0005~ 0.0040%、Al：0.015~0.050%, Ni：0.10~0.30%, Cr：0.10~0.30%, Mo：0.08~0.18%, Cu：0.1 ~0.2%, surplus is Fe and inevitable impurity；
(ii) slab heating temperature is set as 1120~1140 DEG C, 10.3~13min/cm of heat time, soaking time 45min；Really It is uniform to have protected casting billet surface, core temperature, by low-temperature heat system, has effectively controlled the size of original grain degree, to strengthen Structure property provides guarantee；
(iii) temperature control plate blank thickness is set as 3.5~4.0 times of finished product, roughing end percentage pass reduction 26%；Temperature control plate blank thickness is improved, is carried Drafts between high finishing pass, by rolling the further thinning microstructure grain size of means；
(iv) strange passes are used, effective rolling loads to cooling interval are reduced to 18~23s by 35~40s, effectively drop Low final rolling temperature, roller speed bring up to 1.3~1.5m/s by 0.6~0.9m/s, effectively reduce cool time, properly increase roller speed, The structural transformation time is reduced, effective thinning microstructure grain size；
(v) 165~190 DEG C of red temperature；Applicant is had found by studying, and improves tissue grain size by laminar cooling system, by It is larger in slab surface temperature and core temperature difference, when red temperature be more than 300 degree when, steel plate reach cold bed after temperature can on More than 100 degree are risen, rises in cold bed cooling procedure kind temperature and result in tissue dislocation decrease, banded structure exacerbation, have impact on power Learn performance, by setting 165~190 DEG C of slab red temperature, it is ensured that 1/4, core organize the formation of tiny acicular ferrite, And even tissue, does not appear in the phenomenon that temperature is replied on cold bed more, and reduction tissue dislocation, deterioration banded structure are pressed down System, has refined tissue grain size, banded structure is also improved while uniform fine grain is obtained.
The angle of the present invention from tissue grain size is left for, and goes to solve the stability of extremely thick extremely wide varieties and characteristicses, is applied to 3500~5000mm of width, thickness 25~40mm Pipeline Steel Plates, strand core is more beneficial for using low-carbon, low-phosphorous, low-sulfur design Tissue, effectively reduces product fragility；Solution strengthening effect is played using high Nb design, had with carbide, oxide form Thinning microstructure crystal grain is imitated, temper resistance can be effectively increased；Mo can improve the quenching degree and tempering stabilization of think gauge product Property；Ni can improve the intensity of steel, toughness, effectively reduce the embrittlement point of steel, and rational composition design is beneficial to improve heavy slab Through hardening performance, beneficial to even tissue, thinning microstructure crystal grain；Mainly using low-temperature heat system, 3.5~4.0 times of temperature control plate blank Thickness, suitable rolling procedure, by the fast red temperature reached with ultrafast refrigeration technique less than 200 degree of suitable roller, by strong The cold unfavorable factor for eliminating banded structure, bainite, the acicular ferrite structure of densification are obtained at steel plate 1/4 with core, so as to The tissue of even tissue, refined crystalline strengthening is obtained, improves properties of product.As can be seen here, the present invention is designed using low-carbon, increase production The toughness of product, alloy are designed using Nb, Ti, Cr, Mo, Cu, increase the precipitation intensity in the operation of rolling, and blank heating temperature uses Low-temperature heat system, strange passes, it is low enter water, return less than 200 degree red, section cooling system effectively eliminates banded structure, Reach the requirement of core fine grained texture.The present invention successfully solves the manufacture difficult point of generous pipe line steel uneven microstructure, effectively Tissue grain size has been refined, has improved product mechanical property, has increased substantially economic benefit.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of edge of the embodiment of the present invention.
Fig. 2 is the metallographic structure figure at the embodiment of the present invention 1/4.
Fig. 3 is the metallographic structure figure of core of the embodiment of the present invention.
Embodiment
Embodiment 1
The present embodiment is a kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, is comprised the following steps：
(i) the heavy percentage composition of the generous Pipeline Steel Plate of ultra-fine grain is：C：0.04%、Si：0.15%、Mn：1.3%、P：0.008%、 S：0.001%、Nb：0.03%、Ti：0.006%、Ca：0.0005%、Al：0.015%、Ni：0.10%、Cr：0.10%、Mo：0.08%、 Cu：0.136%, surplus is Fe and inevitable impurity；
(ii) slab heating temperature is set as 1120 DEG C, heat time 10.3min/cm, soaking time 45min；
(iii) temperature control plate blank thickness is set as 3.5 times of finished product, roughing end percentage pass reduction 26%；
(iv) strange passes are used, effective rolling loads to cooling interval are reduced to 18s by 35~40s, effectively reduce essence Temperature is rolled, roller speed brings up to 1.3m/s by 0.6~0.9m/s, effectively reduces cool time, properly increases roller speed, reduces tissue and turns Become time, effective thinning microstructure grain size；
(v) 180 DEG C of red temperature.
Embodiment 2
The present embodiment is a kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, is comprised the following steps：
(i) the heavy percentage composition of the generous Pipeline Steel Plate of ultra-fine grain is：C：0.048%、Si：0.248%、Mn：1.53%、P： 0.009%、S：0.002%、Nb：0.032%、Ti：0.013%、Ca：0.0013%、Al：0.032%、Ni：0.20%、Cr：0.14%、 Mo：0.136%、Cu：0.137%, surplus is Fe and inevitable impurity；
(ii) slab heating temperature is set as 1130 DEG C, heat time 12min/cm, soaking time 45min；
(iii) temperature control plate blank thickness is set as 3.8 times of finished product, roughing end percentage pass reduction 26%；
(iv) strange passes are used, effective rolling loads to cooling interval are reduced to 20s by 35~40s, effectively reduce essence Temperature is rolled, roller speed brings up to 1.4m/s by 0.6~0.9m/s, effectively reduces cool time, properly increases roller speed, reduces tissue and turns Become time, effective thinning microstructure grain size；
(v) 169 DEG C of red temperature.
Embodiment 3
The present embodiment is a kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, is comprised the following steps：
(i) the heavy percentage composition of the generous Pipeline Steel Plate of ultra-fine grain is：C：0.045%、Si：0.253%、Mn：1.54%、P： 0.007%、S：0.002%、Nb：0.036%、Ti：0.015%、Ca：0.0025%、Al：0.05%、Ni：0.30%、Cr：0.15%、Mo： 0.138%、Cu：0.138%, surplus is Fe and inevitable impurity；
(ii) slab heating temperature is set as 1130 DEG C, heat time 12.3min/cm, soaking time 45min；
(iii) temperature control plate blank thickness is set as 3.8 times of finished product, roughing end percentage pass reduction 26%；
(iv) strange passes are used, effective rolling loads to cooling interval are reduced to 21s by 35~40s, effectively reduce essence Temperature is rolled, roller speed brings up to 1.3m/s by 0.6~0.9m/s, effectively reduces cool time, properly increases roller speed, reduces tissue and turns Become time, effective thinning microstructure grain size；
(v) 186 DEG C of red temperature.
Embodiment 4
The present embodiment is a kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain, is comprised the following steps：
(i) the heavy percentage composition of the generous Pipeline Steel Plate of ultra-fine grain is：C：0.070%、Si：0.30%、Mn：1.8%、P： 0.005%、S：0.001%、Nb：0.07%、Ti：0.02%、Ca：0.0040%、Al：0.036%、Ni：0.15%、Cr：0.30%、Mo： 0.18%、Cu：0.131%, surplus is Fe and inevitable impurity；
(ii) slab heating temperature is set as 1140 DEG C, heat time 13min/cm, soaking time 45min；
(iii) temperature control plate blank thickness is set as 4.0 times of finished product, roughing end percentage pass reduction 26%；
(iv) strange passes are used, effective rolling loads to cooling interval are reduced to 23s by 35~40s, effectively reduce essence Temperature is rolled, roller speed brings up to 1.5m/s by 0.6~0.9m/s, effectively reduces cool time, properly increases roller speed, reduces tissue and turns Become time, effective thinning microstructure grain size；
(v) 175 DEG C of red temperature.
The metallographic structure of Fig. 1,2 and 3 is obtained using above example, as seen from the figure, 1/4, core even tissue it is tiny, group Knit mainly based on bainite, acicular ferrite structure, tissue grain size is graded 12 grades.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape Into technical scheme, all fall within the protection domains of application claims.

Claims (6)

  1. A kind of 1. production technology of the generous Pipeline Steel Plate of ultra-fine grain, it is characterised in that：Comprise the following steps：
    (i) the heavy percentage composition of the generous Pipeline Steel Plate of the ultra-fine grain is：C：0.040~0.070%, Si：0.15~ 0.30%、Mn：1.30~1.80%, P≤0.015%, S≤0.005%, Nb：0.030~0.07%, Ti：0.006~0.020%, Ca： 0.0005~0.0040%, Al：0.015~0.050%, Ni：0.10~0.30%, Cr：0.10~0.30%, Mo：0.08~ 0.18%、Cu：0.10~0.20%, surplus is Fe and inevitable impurity；
    (ii) slab heating temperature is set as 1120~1140 DEG C, 10.3~13min/cm of heat time, soaking time 45min；
    (iii) temperature control plate blank thickness is set as 3.5~4.0 times of finished product, roughing end percentage pass reduction 26%；
    (iv) use strange passes, effective rolling loads to cooling interval are reduced to 18~23s by 35~40s, roller speed by 0.6~0.9m/s brings up to 1.3~1.5m/s；
    (v) 165~190 DEG C of red temperature.
  2. 2. the production technology of the generous Pipeline Steel Plate of ultra-fine grain as claimed in claim 1, it is characterised in that：The ultra-fine grain 3500~5000mm of width of generous Pipeline Steel Plate, 25~40mm of thickness.
  3. 3. the production technology of the generous Pipeline Steel Plate of ultra-fine grain as claimed in claim 1 or 2, it is characterised in that：Including following Step：
    (i) the heavy percentage composition of the generous Pipeline Steel Plate of the ultra-fine grain is：C：0.04%、Si：0.15%、Mn：1.3%、P： 0.008%、S：0.001%、Nb：0.03%、Ti：0.006%、Ca：0.0005%、Al：0.015%、Ni：0.10%、Cr：0.10%、Mo： 0.08%、Cu：0.136%, surplus is Fe and inevitable impurity；
    (ii) slab heating temperature is set as 1120 DEG C, heat time 10.3min/cm, soaking time 45min；
    (iii) temperature control plate blank thickness is set as 3.5 times of finished product, roughing end percentage pass reduction 26%；
    (iv) strange passes are used, effective rolling loads to cooling interval are 18s, and roller speed is 1.3m/s；
    (v) 180 DEG C of red temperature.
  4. 4. the production technology of the generous Pipeline Steel Plate of ultra-fine grain as claimed in claim 1 or 2, it is characterised in that：Including following Step：
    (i) the heavy percentage composition of the generous Pipeline Steel Plate of the ultra-fine grain is：C：0.048%、Si：0.248%、Mn：1.53%、P： 0.009%、S：0.002%、Nb：0.032%、Ti：0.013%、Ca：0.0013%、Al：0.032%、Ni：0.20%、Cr：0.14%、 Mo：0.136%、Cu：0.137%, surplus is Fe and inevitable impurity；
    (ii) slab heating temperature is set as 1130 DEG C, heat time 12min/cm, soaking time 45min；
    (iii) temperature control plate blank thickness is set as 3.8 times of finished product, roughing end percentage pass reduction 26%；
    (iv) strange passes, effective rolling loads to cooling interval 20s, roller speed 1.4m/s are used；
    (v) 169 DEG C of red temperature.
  5. 5. the production technology of the generous Pipeline Steel Plate of ultra-fine grain as claimed in claim 1 or 2, it is characterised in that：Including following Step：
    (i) the heavy percentage composition of the generous Pipeline Steel Plate of the ultra-fine grain is：C：0.045%、Si：0.253%、Mn：1.54%、P： 0.007%、S：0.002%、Nb：0.036%、Ti：0.015%、Ca：0.0025%、Al：0.05%、Ni：0.30%、Cr：0.15%、Mo： 0.138%、Cu：0.138%, surplus is Fe and inevitable impurity；
    (ii) slab heating temperature is set as 1130 DEG C, heat time 12.3min/cm, soaking time 45min；
    (iii) temperature control plate blank thickness is set as 3.8 times of finished product, roughing end percentage pass reduction 26%；
    (iv) strange passes, effective rolling loads to cooling interval 21s, roller speed 1.3m/s are used；
    (v) 186 DEG C of red temperature.
  6. 6. the production technology of the generous Pipeline Steel Plate of ultra-fine grain as claimed in claim 1 or 2, it is characterised in that：Including following Step：
    (i) the heavy percentage composition of the generous Pipeline Steel Plate of the ultra-fine grain is：C：0.070%、Si：0.30%、Mn：1.8%、P： 0.005%、S：0.001%、Nb：0.07%、Ti：0.02%、Ca：0.0040%、Al：0.036%、Ni：0.15%、Cr：0.30%、Mo： 0.18%、Cu：0.131%, surplus is Fe and inevitable impurity；
    (ii) slab heating temperature is set as 1140 DEG C, heat time 13min/cm, soaking time 45min；
    (iii) temperature control plate blank thickness is set as 4.0 times of finished product, roughing end percentage pass reduction 26%；
    (iv) strange passes, effective rolling loads to cooling interval 23s, roller speed 1.5m/s are used；
    (v) 175 DEG C of red temperature.
CN201710499699.4A 2017-06-27 2017-06-27 A kind of production technology of the generous Pipeline Steel Plate of ultra-fine grain Active CN107385326B (en)

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PCT/CN2018/093096 WO2019001464A1 (en) 2017-06-27 2018-06-27 Production technology for ultra-fine grain wide-thick pipeline steel plate
RU2019135632A RU2734901C1 (en) 2017-06-27 2018-06-27 Production method of ultra-fine thick plate pipe steel

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CN108070789A (en) * 2018-01-17 2018-05-25 山东钢铁集团日照有限公司 The special thick steel of not less than 480MPa grades Ultra-fine Graineds of yield strength and preparation method
WO2019001464A1 (en) * 2017-06-27 2019-01-03 南京钢铁股份有限公司 Production technology for ultra-fine grain wide-thick pipeline steel plate

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CN115323265B (en) * 2022-07-15 2024-03-19 南京钢铁股份有限公司 Superfine crystal steel plate and preparation method thereof

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