CN108385037A - A kind of ocean platform Ti microalloying medium managese steel cut deals and preparation method thereof - Google Patents
A kind of ocean platform Ti microalloying medium managese steel cut deals and preparation method thereof Download PDFInfo
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- CN108385037A CN108385037A CN201810243646.0A CN201810243646A CN108385037A CN 108385037 A CN108385037 A CN 108385037A CN 201810243646 A CN201810243646 A CN 201810243646A CN 108385037 A CN108385037 A CN 108385037A
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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
- C22C38/18—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
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
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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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—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
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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
- C22C38/18—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
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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
- C22C38/18—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
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- 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
- C21D2211/001—Austenite
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- 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
- C21D2211/008—Martensite
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Abstract
A kind of ocean platform Ti microalloying medium managese steel cut deals and preparation method thereof, which is characterized in that its chemical composition is by weight percentage：C：0.03~0.1%, Mn：4.0~8.0%, Ti：0.02~0.10%, Si：0.10~0.40%, S：＜ 0.005%, P：＜ 0.005%, Al：0.02~0.05%, Cr：0.10~0.40%, Ni：0.10~0.30%, Mo：0.10~0.40%, Cu：0.10~0.30%, remaining is Fe and other inevitable impurity；Preparation method：1) ocean platform is forged into blank with Ti microalloying medium managese steel cut deal alloy cast ingots, with being kept the temperature after stove heat, the blank after being heated；2) by the blank after heating, multistage hot deformation is carried out, is quenched after hot rolled plate is made；3) cut deal after quenching is put into stove and heats and keeps the temperature, be air-cooled to room temperature, obtain medium managese steel cut deal, be organized as tempered martensite and tiny adverse transformation austenite duplex structure.
Description
Technical field
The invention belongs to the field of steel production of metallurgy industry, and in particular to a kind of ocean platform manganese in Ti microalloyings
Steel cut deal and preparation method thereof.
Background technology
Marine engineering equipment is the premise and basis of national marine economic development, is in the core of marine industries value chain
Link possesses wide market application prospect.The rate of verifying that is averaged of China's offshore oil and natural gas resource is respectively 12.3%
With 10.9%, rate level is averagely verified in the world well below 73.0% and 60.5%, and compared with land, exploratory engineering of off-shore petroleum/gas reservoir is opened
Hair has very high potential.Important component of the ocean platform as offshore engineering equipment, platform medium plate demand is not
It is disconnected to expand, but spy of the China in terms of high-end marine engineering equipment manufacturing field is still unable to meet demand, especially core equipment
Different steel, there are about 70% marine engineering equipments and equipment to need import every year for China at present.Therefore research and development have independent intellectual production
Power, low energy consumption for preparation flow, the ocean engineering medium plate of high-strength tenacity, to improving China's energy resource structure system, realizing industry
Changing power has strategic importance.
As the exploitation to petroleum resources is gradually developed from land, shallow sea to polar region, blue water, there is big specification, surpass
The matched property of high-strength tenacity increased dramatically with steel demand.Traditional 355MPa, 420MPa and 460MPa grade ocean is flat
Platform steel can not meet the requirement of the high-grade special occasions steel in part, but domestic high intensity levels (460MPa~
550MPa) cut deal, superhigh intensity rank (>=690MPa) cut deal are difficult to ensure in thickness direction ingredient, deformation and cooling rate
It is uniformly distributed, there are larger differences for the obdurability for causing in thickness direction.Currently, domestic and international Conventional marine platform high-strength tenacity
Cut deal is required in terms of composition design using niobium, vanadium, Ti Alloying ingredient, by a large amount of expensive Ni-Mo is added come
The low-temperature impact toughness for ensureing steel plate needs the group for reaching thickness direction using multistage heat treatment in terms of manufacturing process flow
It is uniform to knit performance, causes Plate Production of high cost, energy consumption is big.
Invention content
It is single etc. for thickness direction structure property unevenness, preparation process complexity, strengthening mechanism existing for current special heavy plate
Problem, the present invention provide a kind of ocean platform Ti microalloying medium managese steel cut deals and preparation method thereof.The technology of this method
Scheme is：
A kind of ocean platform Ti microalloying medium managese steel cut deals, by weight percentage its chemical composition are：C：0.03
~0.1%, Mn：4.0~8.0%, Ti：0.02~0.10%, Si：0.10~0.40%, S：＜ 0.005%, P：＜
0.005%, Al：0.02~0.05%, Cr：0.10~0.40%, Ni：0.10~0.30%, Mo：0.10~0.40%, Cu：
0.10~0.30%, remaining is Fe and other inevitable impurity；
The cut deal is organized as tempered martensite and tiny adverse transformation austenite duplex structure.
The cut deal thickness be 20~100mm, yield strength be 710~780MPa, tensile strength be 855~
920MPa, elongation percentage are 23.6~28.9%, -60 DEG C of ballistic work ＞ 100J.
A kind of ocean platform preparation method of Ti microalloying medium managese steel cut deals, comprises the following steps that：
Step 1, blank heating：
Ocean platform is forged into blank with Ti microalloying medium managese steel cut deal alloy cast ingots, with stove heat to 1100~
1250 DEG C, keep the temperature 1~3h, the blank after being heated；
Step 2：Hot rolling treatment：
(1) by the blank after heating, multistage hot deformation is carried out, total reduction is 28.6%~85.7%, and start rolling temperature is
960~1050 DEG C, finishing temperature is 880~970 DEG C, and the hot rolled plate of 20~100mm thickness is made；
(2) it quenches：By hot rolled plate, with the quick water cooling of the cooling velocity of 5~20 DEG C/s to room temperature, after obtaining rolling and quenching
Cut deal.
Step 3：Temper：
After heating furnace is warming up to 620~680 DEG C, cut deal after quenching is put into stove and heats and keep the temperature 30~90min, with
After be air-cooled to room temperature, finally obtain ocean platform Ti microalloying medium managese steel cut deals.
The preparation method of above-mentioned ocean platform Ti microalloying medium managese steel cut deals, wherein：
In the step 1, ocean platform is forged into the base of 140mm thickness with Ti microalloying medium managese steel cut deal alloy cast ingots
Material.
In the step 2,5~13 passage hot rollings are carried out, single pass reduction ratio is 7~25%.
In the step 2, the cut deal microscopic structure after rolling and quenching is lath martensite and a small amount of retained austenite.
In the step 3, the cut deal microscopic structure after tempering is that tempered martensite and tiny adverse transformation austenite are double
To tissue.
Advantage of the invention is that：The present invention carries out for technical barrier existing for the strong offshore platform steel of existing superelevation
Ti microalloying medium managese steel cut deal research and developments, are designed using manganese microalloying in low-carbon, utilize cheap Mn elements
Instead of expensive Ni-Mo alloy systems, Mn can significantly increase steel plate quenching degree, and be stronger among the austenite stabilizing elements, to
Enhance the structure property uniformity of thickness direction, and by ferritic-austenitic two-phase section drawing process, controls reverted austenite Ovshinsky
The toughness plasticity energy of steel plate is substantially improved in the content and stability of body, reduces yield tensile ratio.Innovative uses Ti microalloying skills
Art, by adding Ti elements, using the precipitated phase pinning original austenite crystal prevention of TiN during reheating, to inhibit austenite
Abnormal growth, refine quenched martensite lath, improve refined crystalline strengthening effect.In ferritic-austenitic two-phase section drawing process
In, remaining Ti atoms are combined with C atoms, are formed the TiC precipitated phases of nanoscale, are played the role of significant precipitation strength.Into
And obtain tiny lath martensite and adverse transformation austenite duplex structure, be effectively improved steel plate center portion position intensity and
Plasticity and toughness.Medium managese steel uses micro- Ti processing, can greatly improve welding performance, and refinement welding heat affected zone tissue improves low temperature punching
Hit toughness.Prepared Ti microalloying medium managese steel cut deal yield strengths be 710~780MPa, tensile strength be 855~
920MPa, elongation percentage are 23.6~28.9%, -60 DEG C of ballistic work ＞ 100J.It includes simple quenching to test the steel technological process of production
Temper, control is easy to operate, need not change existing equipment, industrialization easy to implement.
Description of the drawings
1~3 ocean platform of Fig. 1 embodiment of the present invention is shown with the technique of the preparation method of Ti microalloying medium managese steel cut deals
It is intended to；
The metallographic structure of ocean platform Ti microalloying medium managese steel cut deals prepared by Fig. 2 embodiment of the present invention 2；
The EBSD tissue topographies of ocean platform Ti microalloying medium managese steel cut deals prepared by Fig. 3 embodiment of the present invention 2.
The TEM tissue topographies of ocean platform Ti microalloying medium managese steel cut deals prepared by Fig. 4 embodiment of the present invention 2.
Ocean platform prepared by Fig. 5 embodiment of the present invention 2 organizes shape with Ti microalloying medium managese steel the second phases of cut deal TEM
Looks
Specific implementation method
The present invention implements the hot-rolling mill used and automates National Key Laboratory for Northeastern University's rolling technique and tandem rolling and set
Count the Φ 450mm hot-rolling mills of manufacture；
The heating furnace that present invention heat treatment uses is high temperature box type resistance furnace, model RX4-85-13B；
The equipment that metallographic structure is observed in the embodiment of the present invention is to come card DMIRM-2500M metallographic microscopes；
The equipment that SEM tissues are observed in the embodiment of the present invention is Zeiss Ultra55 scanning electron microscope；
The equipment that TEM tissues are observed in the embodiment of the present invention is the Tecnai G of FEI Co.2F20 Flied emission transmitted electrons
Microscope.
The technique signal such as Fig. 1 of the ocean platform of the following embodiment preparation method of Ti microalloying medium managese steel cut deals
It is shown.
Embodiment 1
A kind of ocean platform Ti microalloying medium managese steel cut deals, by weight percentage its chemical composition are：C：
0.10%, Mn：4.0%, Ti：0.02%, Si：0.12%, S：0.001%, P：0.004%, Al：0.02%, Cr：0.40%,
Ni：0.11%, Mo：0.10%, Cu：0.12%, remaining is Fe and other inevitable impurity.
A kind of ocean platform preparation method of Ti microalloying medium managese steel cut deals, comprises the following steps that：
Step 1, blank heating：
Ocean platform is forged into 140mm thick stock material with Ti microalloying medium managese steel cut deal alloy cast ingots, with stove heat
To 1250 DEG C, 1h is kept the temperature, the blank after being heated, by weight percentage its chemical composition are：C：0.10%, Mn：4.0%,
Ti：0.02%, Si：0.12%, S：0.001%, P：0.004%, Al：0.02%, Cr：0.40%, Ni：0.11%, Mo：
0.10%, Cu：0.12%, remaining is Fe and other inevitable impurity.
Step 2：Hot rolling treatment：
(1) by the blank after heating, 13 hot rollings are carried out, single passage pushing rate is 23%, total reduction 85.7%,
Start rolling temperature is 960 DEG C, and finishing temperature is 880 DEG C, and the hot rolled plate of 20mm thickness is made；
(2) it quenches：By hot rolled plate, with the quick water cooling of the cooling velocity of 20 DEG C/s to room temperature, in obtaining after rolling and quenching
Slab, microscopic structure are lath martensite and a small amount of retained austenite.
Step 3：Temper：
After heating furnace is warming up to 620 DEG C, cut deal after quenching is put into stove and heats and keep the temperature 30min, is then air-cooled to
Room temperature, finally obtains ocean platform Ti microalloying medium managese steel cut deals, and microscopic structure is tempered martensite and tiny
The two-way tissue of adverse transformation austenite.
Thickness obtained by the present embodiment is the mechanical property of 20mm cut deals：Yield strength is 780MPa, tensile strength
For 855MPa, elongation after fracture 23.6%, -60 DEG C of ballistic works are 120J.
Embodiment 2
A kind of ocean platform Ti microalloying medium managese steel cut deals, by weight percentage its chemical composition are：C：
0.06%, Mn：6.0%, Ti：0.05%, Si：0.25%, S：0.001%, P：0.003%, Al：0.024%, Cr：0.10%,
Ni：0.20%, Mo：0.25%, Cu：0.20%, remaining is Fe and other inevitable impurity.
A kind of ocean platform preparation method of Ti microalloying medium managese steel cut deals, comprises the following steps that：
Step 1, blank heating：
Ocean platform is forged into 140mm thick stock material with Ti microalloying medium managese steel cut deal alloy cast ingots, with stove heat
To 1200 DEG C, 2h is kept the temperature, the blank after being heated, by weight percentage its chemical composition are：C：0.06%, Mn：6.0%,
Ti：0.05%, Si：0.25%, S：0.001%, P：0.003%, Al：0.024%, Cr：0.10%, Ni：0.20%, Mo：
0.25%, Cu：0.20%, remaining is Fe and other inevitable impurity.
Step 2：Hot rolling treatment：
(1) by the blank after heating, 9 hot rollings are carried out, single passage pushing rate is 18%, total reduction 57.1%,
Start rolling temperature is 1000 DEG C, and finishing temperature is 950 DEG C, and the hot rolled plate of 60mm thickness is made；
(2) it quenches：By hot rolled plate, with the quick water cooling of the cooling velocity of 10 DEG C/s to room temperature, in obtaining after rolling and quenching
Slab, microscopic structure are lath martensite and a small amount of retained austenite.
Step 3：Temper：
After heating furnace is warming up to 650 DEG C, cut deal after quenching is put into stove and heats and keep the temperature 60min, is then air-cooled to
Room temperature, finally obtains ocean platform Ti microalloying medium managese steel cut deals, and microscopic structure is tempered martensite and tiny
The two-way tissue of adverse transformation austenite.
Thickness obtained by the present embodiment be the metallographic structure of the cut deal of 60mm as shown in Fig. 2, EBSD tissue topographies such as
Shown in Fig. 3, TEM tissue topographies as shown in figure 4, the second phase TEM tissue topographies as shown in figure 5, its mechanical property：Yield strength is
745MPa, tensile strength 870MPa, elongation after fracture 26.5%, -60 DEG C of ballistic works are 135J.
Embodiment 3
A kind of ocean platform Ti microalloying medium managese steel cut deals, by weight percentage its chemical composition are：C：
0.03%, Mn：8.0%, Ti：0.10%, Si：0.39%, S：0.002%, P：0.003%, Al：0.05%, Cr：0.40%,
Ni：0.30%, Mo：0.35%, Cu：0.30%, remaining is Fe and other inevitable impurity.
A kind of ocean platform preparation method of Ti microalloying medium managese steel cut deals, comprises the following steps that：
Step 1, blank heating：
Ocean platform is forged into 140mm thick stock material with Ti microalloying medium managese steel cut deal alloy cast ingots, with stove heat
To 1100 DEG C, 3h is kept the temperature, the blank after being heated, by weight percentage its chemical composition are：C：0.03%, Mn：8.0%,
Ti：0.10%, Si：0.39%, S：0.002%, P：0.003%, Al：0.05%, Cr：0.40%, Ni：0.30%, Mo：
0.35%, Cu：0.30%, remaining is Fe and other inevitable impurity.
Step 2：Hot rolling treatment：
(1) by the blank after heating, 3 hot rollings are carried out, single passage pushing rate is 7%, and total reduction 28.6% is opened
It is 1050 DEG C to roll temperature, and finishing temperature is 970 DEG C, and the hot rolled plate of 100mm thickness is made；
(2) it quenches：By hot rolled plate, with the quick water cooling of the cooling velocity of 5 DEG C/s to room temperature, the middle thickness after rolling and quenching is obtained
Plate, microscopic structure are lath martensite and a small amount of retained austenite.
Step 3：Temper：
After heating furnace is warming up to 680 DEG C, cut deal after quenching is put into stove and heats and keep the temperature 90min, is then air-cooled to
Room temperature, finally obtains ocean platform Ti microalloying medium managese steel cut deals, and microscopic structure is tempered martensite and tiny
The two-way tissue of adverse transformation austenite.
Thickness made from the present embodiment is the cut deal mechanical property of 100mm：Yield strength is 710MPa, and tensile strength is
920MPa, elongation after fracture 28.9%, -60 DEG C of ballistic works are 110J.
Claims (8)
1. a kind of ocean platform Ti microalloying medium managese steel cut deals, which is characterized in that its chemical composition by weight percentage
For：C：0.03~0.1%, Mn：4.0~8.0%, Ti：0.02~0.10%, Si：0.10~0.40%, S：＜ 0.005%, P：
＜ 0.005%, Al：0.02~0.05%, Cr：0.10~0.40%, Ni：0.10~0.30%, Mo：0.10~0.40%, Cu：
0.10~0.30%, remaining is Fe and other inevitable impurity.
2. ocean platform described in claim 1 Ti microalloying medium managese steel cut deals, which is characterized in that the cut deal group
It is woven to tempered martensite and tiny adverse transformation austenite duplex structure.
3. ocean platform described in claim 1 Ti microalloying medium managese steel cut deals, which is characterized in that the cut deal is thick
Degree be 20~100mm, yield strength be 710~780MPa, tensile strength be 855~920MPa, elongation percentage be 23.6~
28.9%, -60 DEG C of ballistic work ＞ 100J.
4. the ocean platform described in claim 1 preparation method of Ti microalloying medium managese steel cut deals, including following technique
Step：
Step 1, blank heating：
Ocean platform is forged into blank with Ti microalloying medium managese steel cut deal alloy cast ingots, with stove heat to 1100~1250
DEG C, keep the temperature 1~3h, the blank after being heated；
Step 2：Hot rolling treatment：
(1) by the blank after heating, multistage hot deformation is carried out, total reduction is 28.6%~85.7%, start rolling temperature is 960~
1050 DEG C, finishing temperature is 880~970 DEG C, and the hot rolled plate of 20~100mm thickness is made；
(2) it quenches：By hot rolled plate, with the quick water cooling of the cooling velocity of 5~20 DEG C/s to room temperature, the middle thickness after rolling and quenching is obtained
Plate.
Step 3：Temper：
After heating furnace is warming up to 620~680 DEG C, cut deal after quenching is put into stove and heats and keep the temperature 30~90min, it is then empty
It is cooled to room temperature, finally obtains ocean platform Ti microalloying medium managese steel cut deals.
5. the ocean platform according to claim 4 preparation method of Ti microalloying medium managese steel cut deals, feature exist
In in the step 1, ocean platform is forged into the blank of 140mm thickness with Ti microalloying medium managese steel cut deal alloy cast ingots.
6. the ocean platform according to claim 4 preparation method of Ti microalloying medium managese steel cut deals, feature exist
In in the step 2,5~13 passage hot rollings of progress, single pass reduction ratio is 7~25%.
7. the ocean platform according to claim 4 preparation method of Ti microalloying medium managese steel cut deals, feature exist
In in the step 2, the cut deal microscopic structure after rolling and quenching is lath martensite and a small amount of retained austenite.
8. the ocean platform according to claim 4 preparation method of Ti microalloying medium managese steel cut deals, feature exist
In in the step 3, the cut deal microscopic structure after tempering is tempered martensite and two-way group of tiny adverse transformation austenite
It knits.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110846577A (en) * | 2019-11-20 | 2020-02-28 | 南京钢铁股份有限公司 | 690 MPa-grade high-strength low-yield-ratio medium-thickness manganese steel and manufacturing method thereof |
| CN110983158A (en) * | 2019-12-16 | 2020-04-10 | 南京钢铁股份有限公司 | 550 MPa-grade medium manganese steel plate and manufacturing method thereof |
| CN113549745A (en) * | 2021-07-27 | 2021-10-26 | 内蒙古工业大学 | Low-cost third-generation automobile steel processing technology |
| CN115323251A (en) * | 2022-08-24 | 2022-11-11 | 东北大学 | Super-thick, high-strength, high-toughness and high-homogeneity super-thick steel plate for hydropower and manufacturing method thereof |
| CN116536566A (en) * | 2023-03-28 | 2023-08-04 | 本钢板材股份有限公司 | Production method of 980 MPa-grade ultralow-carbon cold-rolled medium-manganese steel |
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