CN109355566A - A kind of low cost Q420D steel plate and preparation method thereof - Google Patents
A kind of low cost Q420D steel plate and preparation method thereof Download PDFInfo
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- CN109355566A CN109355566A CN201811376381.8A CN201811376381A CN109355566A CN 109355566 A CN109355566 A CN 109355566A CN 201811376381 A CN201811376381 A CN 201811376381A CN 109355566 A CN109355566 A CN 109355566A
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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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
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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
- C21D2211/005—Ferrite
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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
- C21D2211/009—Pearlite
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Abstract
The invention discloses a kind of low cost Q420D steel plate, the chemical component of the steel, by weight percentage: C:0.16~0.18%；Si:0.28~0.38%；Mn:0.8~1.0%；Cr:0.35~0.45；P≤0.018%；S≤0.004%；Ca:0.0010~0.0025%；Als:0.017~0.03%；Remaining is iron and inevitable impurity.Also disclose preparation method.The present invention has produced the good Q420D steel plate of comprehensive performance by suitably heating, rolling, controlling cold technique.Steel plate good mechanical performance, the yield strength of steel plate is between 442MPa~485MPa, and tensile strength is between 555~610MPa, and elongation percentage is between 20%~27%, and -20 DEG C of ballistic works are between 160J~215J.
Description
Technical field
The present invention relates to structural steel field, in particular to a kind of low cost Q420D steel plate and preparation method thereof.
Background technique
Q420D low-alloy high-tensile structural steel plate is widely used with its higher intensity and good toughness in work
The fields such as journey machinery, building construction.The ballistic work that -20 DEG C of requirements of the national standard of Q420D steel plate is not less than 34J, it is desirable that steel plate tool
While having higher-strength, it is also necessary to have good toughness.The final tissue of Q420D steel plate is generally ferrite+pearlite,
Ingredient design adds the microalloys such as a certain amount of Nb, V on the basis of being frequently in C-Mn composition of steel, and passes through controlled rolling, the cold technique of control
Carry out abundant fining ferrite grains and guarantees that the intensity of steel plate or toughness are met the requirements.Or it is heat-treated after being rolled by steel plate to improve
The mechanical property of steel plate improves plasticity and toughness.
Patent " a kind of superfine grain steel sheet with yield strength of 420 MPa grade and its manufacturer of publication number " CN101397625A "
Method " provides a kind of production method of yield strength 420MPa grades of steel plates.This method production intensity meet the requirements, toughness also compared with
It is good.But this method final cooling temperature is lower, the bad control of steel-plate shape；The finishing temperature of steel plate is low, and intensity is high when rolling, to milling train
Capability Requirement is high.
" a kind of yield strength is that 420MPa normalizing can weld fine grain steel plate to the patent of publication number " CN101413049A "
Preparation method " provides a kind of production method of yield strength 420MPa grades of steel plates.This method production intensity is met the requirements, toughness
Also preferably.But this method needs to add the microalloys such as Nb, V, Ti, and cost of alloy is high.Normalized treatment, work will also be carried out by rolling rear steel plate
Sequence higher cost.
Patent " a kind of 420MPa grades of normalizing state spy's think gauge structural steel plate and its system of publication number " CN103540848A "
Make method " provide a kind of production method of yield strength 420MPa grades of thick steel plates.This method production intensity is met the requirements, toughness
Also preferably.But this method needs to add the alloys such as Nb, V, Ti, Ni, and cost of alloy is high.Normalized treatment will also be carried out by rolling rear steel plate,
Process cost is higher.
Summary of the invention
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of surface quality is good, cost of alloy is low, by force
Degree and toughness match good Q420D steel plate, and simple production process.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of low cost Q420D steel plate includes following chemical component by weight percentage:
C:0.16~0.18%；Si:0.28~0.38%；Mn:0.8~1.0%；Cr:0.35~0.45；P :≤
0.018%；S≤0.004%；Ca:0.0010~0.0025%；Als:0.017~0.03%；Remaining is iron and inevitable miscellaneous
Matter.
Further, by weight percentage include following chemical component:
C:0.16%, Si:0.28%, Mn:0.8%, Cr0.35, P:0.015%, S:0.002%, Als:0.017%,
Ca:0.0015%, surplus are Fe and inevitable impurity.
Further, by weight percentage include following chemical component:
C:0.17%, Si:0.34%, Mn:0.95%, Cr:0.42, P:0.015%, S:0.001%, Als:0.024%,
Ca:0.0010%, surplus are Fe and inevitable impurity.
Further, by weight percentage include following chemical component:
C:0.17%, Si:0.35%, Mn:0.88%, Cr:0.41, P:0.013%, S:0.001%, Als:0.021%,
Ca:0.0022%, surplus are Fe and inevitable impurity.
A kind of preparation method of low cost Q420D steel plate, includes the following steps:
1) continuous casting billet of 250mm thickness is selected；
2) heating process: being produced using the continuous casting billet of 250mm thickness, walking beam furnace is used when heating of plate blank, even
1160-1190 DEG C of slab tapping temperature, heating time 240~360 minutes, walking beam held up plate when slab heats in heating furnace
The movement speed of base is 1.18m/min；
3) 15mm~20mm thick steel plate roll forming technique: carrying out controlled rolling after heating of plate blank is good, the first stage opens
It rolls with a thickness of slab thickness, 1150~1180 DEG C of first stage start rolling temperature, first stage finishing temperature >=1010 DEG C, the first rank
Single pass reduction ratio >=12% when Duan Gaowen extends rolling, first stage mill speed are 1.3~2.3m/s；Second stage steel plate
Open rolling with a thickness of 4.5 times of finished steel plate thickness, second stage steel plate start rolling temperature is 860~890 DEG C, second stage finish to gauge temperature
Degree is 770~800 DEG C；Steel plate carries out section cooling after rolling, final cooling temperature is 600~620 DEG C；
4) 20mm~35mm thick steel plate roll forming technique: carrying out controlled rolling after heating of plate blank is good, the first stage opens
It rolls with a thickness of slab thickness, 1150~1180 DEG C of first stage start rolling temperature, 990 DEG C of first stage finishing temperature >, the first rank
Single pass reduction ratio >=11% when Duan Gaowen extends rolling, first stage mill speed are 1.0~1.6m/s；Second stage steel plate
Open rolling with a thickness of 3.8~4.2 times of finished steel plate thickness, second stage steel plate start rolling temperature is 860~880 DEG C, second stage
Finishing temperature is 770~790 DEG C；Steel plate carries out section cooling after rolling, final cooling temperature is 600~620 DEG C；
5) steel plate thickness of the present invention is 15mm~35mm thick.
Further, in the step 3), steel plate carries out cooling velocity when section cooling after rolling be 21~26 DEG C/s.
Further, in the step 4), steel plate carries out cooling velocity when section cooling after rolling be 17~25 DEG C/s.
Controlled rolling is carried out in austenite recrystallization area to the above-mentioned continuous casting billet heated.Since the design of this ingredient is free of
The microalloys such as Nb, V, therefore recrystallization rolling is all belonged to when rolling.First stage controlled rolling belongs to the austenite of high-temperature region
Controlled rolling is recrystallized, this stage is using low speed, the rolling strategy depressed greatly.Biggish single pass reduction ratio can be such that rolling becomes
Shape is fully penetrated to steel plate center, abundant fining austenite grains and homogeneous austenite structure, while rolling the high temperature weldering of generation
The defects of cooperation is with the loose, micro-crack inside slab is largely eliminated, improves the consistency of steel plate, and material integrates
Performance improvement；Since semifinished product is thicker when first stage rolls, temperature drop is slow, has rolled the every a time of steel plate using low speed rolling
Biggish temperature drop, rolling a time every in this way will refine in various degree crystal grain, be finally reached sufficiently refinement austenite
The purpose of crystal grain；There are also rolling when mill speed it is low, resistance of deformation is small, biggish single pass reduction ratio easy to accomplish.First rank
The lower finishing temperature of Duan Caiyong is to consolidate the rolling achievement of first stage to obtain tiny austenite grain.
After first stage rolls, intermediate base swings cooling on roller-way, opens when being cooled to second stage start rolling temperature
To begin rolling, the rolling of second stage belongs to cryogenic re-crystallisation controlled rolling, when this stage rolling, austenite grain is crushed repeatedly,
Recrystallization softening is further refined again on the basis of such austenite grain is finally rolling refined in the first stage, and by
After second stage rolls, finishing temperature is lower, and austenite grain is no longer grown up substantially, finally obtains tiny austenite crystal
Grain.Austenite grain is more tiny, and grain boundary area is bigger, and nucleation site when from austenite to ferritic transformation is more, shape
Core rate is higher, and finally obtained ferrite crystal grain is more tiny, and the intensity of steel plate is higher, and impact flexibility is better.And it is adopted after rolling
With section cooling, steel plate is quickly cooled to 600~620 by finishing temperature, further reduced austenite to ferritic turn
Temperature has further refined ferrite crystal grain, to improve the intensity and toughness of steel plate.
Compared with prior art, advantageous effects of the invention:
1) present invention is using inexpensive ingredient design, only with alloys such as cheap Si, Mn, Cr, by suitably heating,
Controlled rolling, the cold technique of control have just obtained the good Q420D steel plate of comprehensive performance.Cost of alloy and manufacturing cost are lower.
2) intensity, plasticity, the toughness of steel plate are good, organize as tiny ferrite+pearlite.The yield strength of steel plate exists
Between 442MPa~485MPa, tensile strength is between 555~610MPa, and elongation percentage is between 20%~27%, -20 DEG C of impacts
Function is between 160J~215J.
Detailed description of the invention
The invention will be further described for explanation with reference to the accompanying drawing.
Fig. 1 is the metallographic structure figure of the steel plate of the embodiment of the present invention 1；
Fig. 2 is the metallographic structure figure of the steel plate of the embodiment of the present invention 2；
Fig. 3 is the metallographic structure figure of the steel plate of the embodiment of the present invention 3；
Fig. 4 is the metallographic structure figure of the steel plate of the embodiment of the present invention 4；
Fig. 5 is the metallographic structure figure of the steel plate of the embodiment of the present invention 5；
Fig. 6 is the metallographic structure figure of the steel plate of the embodiment of the present invention 6.
Specific embodiment
The invention will be further described with reference to embodiments.
Embodiment 1
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1160 DEG C, and slab heating time is 240 minutes,
(weight percent) chemical component of slab are as follows: C 0.16%, Si 0.28%, Mn 0.8%, Cr0.35, P 0.015%, S
0.002%, Als 0.017%, Ca 0.0015%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 15mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 1, mechanical property is shown in Table 2.Such as the metallographic structure figure that Fig. 1 is steel plate, organize to be thin
Small ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 1 and cooling technique
2 mechanical property of steel plate of table
Embodiment 2
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1190 DEG C, and slab heating time is 360 minutes,
(weight percent) chemical component of slab are as follows: C 0.18%, Si 0.38%, Mn 1.0%, Cr0.45, P 0.018%, S
0.004%, Als 0.03%, Ca 0.0025%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 20mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 3, mechanical property is shown in Table 4.Such as the metallographic structure figure that Fig. 2 is steel plate, organize to be thin
Small ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 3 and cooling technique
4 mechanical property of steel plate of table
Embodiment 3
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1176 DEG C, and slab heating time is 328 minutes,
(weight percent) chemical component of slab are as follows: C 0.17%, Si 0.34%, Mn 0.95%, Cr0.42, P 0.015%, S
0.001%, Als 0.024%, Ca 0.0010%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 18mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 5, mechanical property is shown in Table 6.Such as the metallographic structure figure that Fig. 3 is steel plate, organize to be thin
Small ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 5 and cooling technique
6 mechanical property of steel plate of table
Embodiment 4
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1190 DEG C, and slab heating time is 360 minutes,
(weight percent) chemical component of slab are as follows: C 0.18%, Si 0.28%, Mn 0.8%, Cr0.35, P 0.018%, S
0.004%, Als 0.017%, Ca 0.0010%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 35mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 7, mechanical property is shown in Table 8.Such as the metallographic structure figure that Fig. 4 is steel plate, organize to be thin
Small ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 7 and cooling technique
8 mechanical property of steel plate of table
Embodiment 5
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1160 DEG C, and slab heating time is 240 minutes,
(weight percent) chemical component of slab are as follows: C 0.16%, Si 0.38%, Mn 1.0%, Cr0.45, P 0.014%, S
0.002%, Als 0.03%, Ca 0.0025%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 30mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 9, mechanical property is shown in Table 10.If Fig. 5 be steel plate metallographic structure figure, organize be
Tiny ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 9 and cooling technique
10 mechanical property of steel plate of table
Embodiment 6
Using with a thickness of 250mm slab, when heating of plate blank, uses walking beam furnace, work when slab heat in heating furnace
The movement speed that dynamic corbel plays slab is 1.18m/min, and slab tapping temperature is 1173 DEG C, and slab heating time is 257 minutes,
(weight percent) chemical component of slab are as follows: C 0.17%, Si 0.35%, Mn 0.88%, Cr0.41, P 0.013%, S
0.001%, Als 0.021%, Ca 0.0022%, surplus are Fe and inevitable impurity.It is rolled into the steel with a thickness of 25mm
Plate, it is detailed rolling and it is cold go technique to be shown in Table 11, mechanical property is shown in Table 12.If Fig. 6 be steel plate metallographic structure figure, organize be
Tiny ferrite+pearlite, intensity, plasticity, the toughness of steel plate are good.
The rolling of table 11 and cooling technique
12 mechanical property of steel plate of table
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (7)
1. a kind of low cost Q420D steel plate, which is characterized in that by weight percentage include following chemical component:
C:0.16~0.18%；Si:0.28~0.38%；Mn:0.8~1.0%；Cr:0.35~0.45；P :≤0.018%；S
≤ 0.004%；Ca:0.0010~0.0025%；Als:0.017~0.03%；Remaining is iron and inevitable impurity.
2. low cost Q420D steel plate according to claim 1, which is characterized in that by weight percentage include following chemistry
Ingredient:
C:0.16%, Si:0.28%, Mn:0.8%, Cr0.35, P:0.015%, S:0.002%, Als:0.017%, Ca:
0.0015%, surplus is Fe and inevitable impurity.
3. low cost Q420D steel plate according to claim 1, which is characterized in that by weight percentage include following chemistry
Ingredient:
C:0.17%, Si:0.34%, Mn:0.95%, Cr:0.42, P:0.015%, S:0.001%, Als:0.024%, Ca:
0.0010%, surplus is Fe and inevitable impurity.
4. low cost Q420D steel plate according to claim 1, which is characterized in that by weight percentage include following chemistry
Ingredient:
C:0.17%, Si:0.35%, Mn:0.88%, Cr:0.41, P:0.013%, S:0.001%, Als:0.021%, Ca:
0.0022%, surplus is Fe and inevitable impurity.
5. the preparation method of low cost Q420D steel plate according to any one of claims 1-4, which is characterized in that including
Following steps:
1) continuous casting billet of 250mm thickness is selected；
2) heating process: being produced using the continuous casting billet of 250mm thickness, and walking beam furnace, continuous casting billet are used when heating of plate blank
1160-1190 DEG C of tapping temperature, heating time 240~360 minutes, walking beam held up slab when slab heats in heating furnace
Movement speed is 1.18m/min；
3) 15mm~20mm thick steel plate roll forming technique: carrying out controlled rolling after heating of plate blank is good, first stage open rolling is thick
Spending is slab thickness, 1150~1180 DEG C of first stage start rolling temperature, first stage finishing temperature >=1010 DEG C, and first stage height
Single pass reduction ratio >=12% when temperature extends rolling, first stage mill speed are 1.3~2.3m/s；Second stage steel plate is opened
It rolls with a thickness of 4.5 times of finished steel plate thickness, second stage steel plate start rolling temperature is 860~890 DEG C, and second stage finishing temperature is
770~800 DEG C；Steel plate carries out section cooling after rolling, final cooling temperature is 600~620 DEG C；
4) 20mm~35mm thick steel plate roll forming technique: carrying out controlled rolling after heating of plate blank is good, first stage open rolling is thick
Degree is slab thickness, and 1150~1180 DEG C of first stage start rolling temperature, 990 DEG C of first stage finishing temperature >, the first stage is high
Single pass reduction ratio >=11% when temperature extends rolling, first stage mill speed are 1.0~1.6m/s；Second stage steel plate is opened
It rolls with a thickness of 3.8~4.2 times of finished steel plate thickness, second stage steel plate start rolling temperature is 860~880 DEG C, second stage finish to gauge
Temperature is 770~790 DEG C；Steel plate carries out section cooling after rolling, final cooling temperature is 600~620 DEG C；
5) steel plate thickness of the present invention is 15mm~35mm thick.
6. the preparation method of low cost Q420D steel plate according to claim 5, which is characterized in that in the step 3), steel
Plate carries out cooling velocity when section cooling after rolling be 21~26 DEG C/s.
7. the preparation method of low cost Q420D steel plate according to claim 5, which is characterized in that in the step 4), steel
Plate carries out cooling velocity when section cooling after rolling be 17~25 DEG C/s.
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Cited By (2)
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| CN111979499A (en) * | 2020-08-11 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Production method of low-cost Q460C thick steel plate |
| CN112048667A (en) * | 2020-08-25 | 2020-12-08 | 包头钢铁（集团）有限责任公司 | Low-cost Q420D thick steel plate and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111979499A (en) * | 2020-08-11 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Production method of low-cost Q460C thick steel plate |
| CN112048667A (en) * | 2020-08-25 | 2020-12-08 | 包头钢铁（集团）有限责任公司 | Low-cost Q420D thick steel plate and production method thereof |
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Application publication date: 20190219 |