CN106756529B - The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel - Google Patents
The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel Download PDFInfo
- Publication number
- CN106756529B CN106756529B CN201611016620.XA CN201611016620A CN106756529B CN 106756529 B CN106756529 B CN 106756529B CN 201611016620 A CN201611016620 A CN 201611016620A CN 106756529 B CN106756529 B CN 106756529B
- Authority
- CN
- China
- Prior art keywords
- low
- steel
- thin strip
- acicular ferrite
- volume fraction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
Abstract
A kind of method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel, carries out according to the following steps：（1）Molten steel is smelted, chemical composition is by mass percentage containing C 0.03 ~ 0.25%, Si 0.2 ~ 0.5%, Mn 1 ~ 1.5%, Al≤0.01%, V 0.02 ~ 0.1%, P 0.003 ~ 0.01%, S 0.001 ~ 0.02%, O 0.003 ~ 0.008%, N 0.008 ~ 0.015%, surplus Fe；（2）Tundish is preheated, molten steel is poured into through tundish in twin-roll thin strip continuous casting equipment, roll gap of the molten steel through casting roll is solidified and exported；（3）Cast Strip is cooled to 900 ~ 1050 DEG C, carries out hot rolling；（4）It is crimped after water cooling.The volume fraction of acicular ferrite is 50 ~ 95% in the low-carbon strip steel hot-rolled sheet coil that the present invention is produced, and has effectively refined low-carbon strip structure of steel, has improved the comprehensive performance of low-carbon Thin Strip Steel, method flow is short, energy conservation and environmental protection, at low cost.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to acicular ferrite in a kind of raising double-roller rolling low-carbon Thin Strip Steel
The method of volume fraction.
Background technology
Double-roller rolling technology be using liquid metal as raw material, the casting roll opposite by the use of two direction of rotation as crystallizer,
Liquid metal is made to pass through casting roll roll gap to solidify and be molded, directly produces the cutting edge technology for the band that thickness is 1 ~ 5mm.With tradition
Strip production technology compare, double-roller rolling technology can save the productions such as conticaster, heating furnace, roughing mills and mm finishing mill unit
Equipment makes a length of hundreds of meters of output strip line of traditional processing technology foreshorten to 50 ~ 60m, be a kind of energy-saving and environmental protection, it is low into
This short route technology.
It is an important development direction using double-roller rolling technology production low-carbon Thin Strip Steel.However it has now been found that, base
In double-roller rolling technological development low-carbon Thin Strip Steel, tissue is coarse relative to the hot rolled plate tissue that traditional handicraft is produced.This is
Because based on double-roller rolling technique feature, prepared Cast Strip thickness only has 1 ~ 5mm, it is impossible to which the processing for carrying out moderate finite deformation amount becomes
Shape, Cast Strip tissue hardly results in refinement, so as to influence the mechanical property of low-carbon Thin Strip Steel.It is it is now recognized that thin in double-roller rolling low-carbon
Acicular ferrite structure is obtained in strip can effectively refine its tissue, so as to improve its mechanical property, therefore how improve double
The content of acicular ferrite is a urgent problem to be solved in roller casting low-carbon Thin Strip Steel.
Oxides Metallurgy Technology can be by the use of the suitable field trash of size in original austenite grain as acicular ferrite
Equiax crystal is effectively obtained acicular ferrite structure, and acicular ferrite is the needle-shaped of a kind of interdigitated interlock shape and high dislocation density
Tissue.Gun parallax between acicular ferrite lath is larger, can effectively inhibit the extension of crackle.
Invention content
It is coarse for the relatively conventional technique hot rolled plate tissue of low-carbon strip structure of steel prepared by current double-roller rolling, cause
Double-roller rolling low-carbon Thin Strip Steel poor-performing problem, the present invention provide needle-shaped iron element in a kind of raising double-roller rolling low-carbon Thin Strip Steel
The method of body volume fraction by composition design and uses twin-roll thin strip continuous casting technique, obtains a large amount of acicular ferrite structures,
Shorten flow simultaneously, reduce cost.
The present invention improve double-roller rolling low-carbon Thin Strip Steel in acicular ferrite volume fraction method according to the following steps into
Row：
（1）Molten steel is smelted, chemical composition contains C 0.03 ~ 0.25%, Si 0.2 ~ 0.5%, Mn 1 ~ 1.5% by mass percentage,
Al≤0.01%, V 0.02 ~ 0.1%, P 0.003 ~ 0.01%, S 0.001 ~ 0.02%, O 0.003 ~ 0.008%, N 0.008 ~
0.015%, surplus Fe；
（2）Tundish is preheated to 1100 ~ 1200 DEG C, the molten steel in ladle is poured into twin-roll thin strip continuous casting through tundish sets
In standby, control pouring temperature is 1520 ~ 1540 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 30 ~ 50m/
Min obtains the Cast Strip that thickness is 2.0 ~ 2.5mm；
（3）900 ~ 1050 DEG C are cooled to 10 ~ 15 DEG C/s after Cast Strip export casting roll, a time hot rolling is proceeded by, obtains
The hot rolled plate of 1.4 ~ 2.0mm thickness；
（4）Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 550 ~ 650 DEG C, and water cooling rate is 20 ~ 45 DEG C/s, is obtained low
Carbon Thin Strip Steel.
The volume fraction of acicular ferrite is 50 ~ 95% in above-mentioned low-carbon Thin Strip Steel.
For the present invention by the use of the field trash that MnS and VN are combined as the effective nucleation site of acicular ferrite, this is compound
The characteristics of field trash, is formed in the Solid State Structure after Cast Strip process of setting and completely solidification.In the process of setting of Cast Strip, when
There is solid phase to initially form, MnS starts to be precipitated in solid phase；As temperature declines, MnS grows up, and has VN on MnS surfaces
It is formed, obtains the field trash that MnS and VN are combined；The field trash that the MnS and VN formed by the use of in tissue is combined as
The nucleation site of acicular ferrite can be effectively prevented from because of oxide（Such as（Ti-Al-Si-Mn）-OxComposite oxides）In
Between occur to float in the molten steel that wraps so that the problem of size, quantity and the distribution of field trash are difficult to control, so as to make double-roller rolling
A large amount of acicular ferrite structures are obtained in low-carbon Thin Strip Steel；
In order to control the size of MnS, after high temperature low-carbon thin steel belt casting band exports casting roll, 900 are cooled to 10 ~ 15 DEG C/s
~ 1050 DEG C, make MnS that there is sufficiently high temperature and time enough to grow up to 0.5 ~ 2 μm；Take water-cooling pattern that can inhibit brilliant
Wei Shi ferritic formation in boundary creates acicular ferrite in the degree of supercooling condition needed for the forming core of field trash surface, so as to promote needle
The formation of columnar ferrite.
With the MnS that Cast Strip high temperature is precipitated as matrix, VN is precipitated the present invention on MnS surfaces, i.e., using being formed in tissue
Nucleation site as acicular ferrite of MnS and the field trashes that are combined of VN；Because MnS and VN is in steel in this technology
Is precipitated in Solid State Structure after water-setting is solid, can be efficiently solved in this way because floating occurs in the molten steel of tundish for oxide so that
The problem of size, quantity and the distribution of field trash are difficult to control, it is a large amount of needle-shaped so as to make to obtain in double-roller rolling low-carbon Thin Strip Steel
Ferritic structure；Through retrieval, a kind of " micro- conjunction of double roller continuous casting low-carbon containing acicular ferrite of 104962829 A of Publication No. CN
104959561 A of golden steel and its manufacturing method " and Publication No. CN " it is a kind of raising double roller continuous casting low-carbon micro steel-alloy it is needle-shaped
In the method for ferrite content ", field trash that acicular ferrite nucleating is utilized is Ti, Al, Si, Mn composite oxides, this hair
The particle that bright acicular ferrite nucleating is utilized is the field trash that MnS and VN are combined, different from its Nucleation Mechanism.
The volume fraction of acicular ferrite is 50 ~ 95% in the low-carbon strip steel hot-rolled sheet coil that the present invention is produced, effectively
Low-carbon strip structure of steel has been refined, has improved the comprehensive performance of low-carbon Thin Strip Steel, and relative to conventional belt steel-making process, sheet
Techniqueflow is short, energy conservation and environmental protection, at low cost.
Description of the drawings
Fig. 1 is the specific embodiment schematic diagram of the present invention；
Wherein：1：Ladle；2：Tundish；3：Molten bath；4：Casting roll；5：Cast Strip；6：Slow cooling system；7：Hot-rolling mill；8：Hot rolling
Plate；9：Water-cooling system；10：Coiling machine；11：Low-carbon strip steel hot-rolled sheet coil.
Fig. 2 is the metallographic structure figure of low-carbon Thin Strip Steel that the embodiment of the present invention 1 obtains.
Specific embodiment
The molten steel of the present invention is poured into through tundish in twin-roll thin strip continuous casting equipment, is the rotation for pouring into molten steel through tundish
Molten bath is formed in the cavity of two opposite casting rolls of direction and side seal board composition.
The volume fraction of acicular ferrite is according to gold in the double-roller rolling low-carbon Thin Strip Steel obtained in the embodiment of the present invention
The areal calculation of acicular ferrite obtains in phase constitution figure, using ImageJ image processing softwares.
The equipment that observation metallographic structure uses in the embodiment of the present invention is LEICA DMIRM type light microscope.
The yield strength of low-carbon Thin Strip Steel that the present invention obtains is 430 ~ 490MPa, and tensile strength is 680 ~ 740MPa, is broken
Elongation percentage is 15 ~ 28% afterwards.
Embodiment 1
Molten steel is smelted, chemical composition contains C 0.03%, Si 0.2%, Mn 1.5%, Al 0.004%, V by mass percentage
0.02%, P 0.005%, S 0.001%, O 0.003%, N 0.01%, surplus Fe；
Tundish is preheated to 1200 DEG C, the molten steel in ladle is poured into through tundish in twin-roll thin strip continuous casting equipment, is controlled
Pouring temperature processed is 1520 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 30m/min, and obtaining thickness is
The Cast Strip of 2.5mm；
900 DEG C are cooled to 10 DEG C/s after Cast Strip export casting roll, a time hot rolling is proceeded by, obtains the heat of 2.0mm thickness
Roll plate；
Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 550 DEG C, and water cooling rate is 45 DEG C/s, obtains low-carbon Thin Strip Steel；
In low-carbon Thin Strip Steel the volume fraction of acicular ferrite be 90%, metallographic structure as shown in Fig. 2, yield strength be 480MPa, tension
Intensity is 730MPa, elongation after fracture 17%.
Embodiment 2
Smelt molten steel, chemical composition 0.1%, 0.3%Si, 1%Mn, 0.01%Al, 0.1%V containing C by mass percentage,
0.003%P, 0.02%S, 0.005%O, 0.008%N, surplus Fe；
Tundish is preheated to 1150 DEG C, the molten steel in ladle is poured into through tundish in twin-roll thin strip continuous casting equipment, is controlled
Pouring temperature processed is 1540 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 50m/min, and obtaining thickness is
The Cast Strip of 2.0mm；
1000 DEG C are cooled to 12 DEG C/s after Cast Strip export casting roll, a time hot rolling is proceeded by, obtains the heat of 1.4mm thickness
Roll plate；
Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 570 DEG C, and water cooling rate is 35 DEG C/s, obtains low-carbon Thin Strip Steel；
The volume fraction of acicular ferrite is 63%, yield strength 450MPa, tensile strength 700MPa in low-carbon Thin Strip Steel, is broken
Elongation percentage is 21% afterwards.
Embodiment 3
Molten steel is smelted, chemical composition contains C 0.17%, Si 0.5%, Mn 1.3%, Al 0.002%, V by mass percentage
0.05%, P 0.01%, S 0.02%, O 0.008%, N 0.015%, surplus Fe；
Tundish is preheated to 1130 DEG C, the molten steel in ladle is poured into through tundish in twin-roll thin strip continuous casting equipment, is controlled
Pouring temperature processed is 1520 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 40m/min, and obtaining thickness is
The Cast Strip of 2.5mm；
1050 DEG C are cooled to 15 DEG C/s after Cast Strip export casting roll, a time hot rolling is proceeded by, obtains the heat of 2.0mm thickness
Roll plate；
Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 650 DEG C, and water cooling rate is 25 DEG C/s, obtains low-carbon Thin Strip Steel；
The volume fraction of acicular ferrite is 95% in low-carbon Thin Strip Steel, and yield strength 490MPa, tensile strength 740MPa have no progeny
Elongation percentage is 15%.
Embodiment 4
Molten steel is smelted, chemical composition contains C 0.25%, Si 0.25%, Mn 1.1%, Al 0.002%, V by mass percentage
0.04%, P 0.004%, S 0.015%, 0. O 004%, N 0.01%, surplus Fe；
Tundish is preheated to 1100 DEG C, the molten steel in ladle is poured into through tundish in twin-roll thin strip continuous casting equipment, is controlled
Pouring temperature processed is 1530 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 50m/min, and obtaining thickness is
The Cast Strip of 2.2mm；
1050 DEG C are cooled to 15 DEG C/s after Cast Strip export casting roll, a time hot rolling is proceeded by, obtains the heat of 1.8mm thickness
Roll plate；
Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 580 DEG C, and water cooling rate is 20 DEG C/s, obtains low-carbon Thin Strip Steel；
The volume fraction of acicular ferrite is 50% in low-carbon Thin Strip Steel, and yield strength 430MPa, tensile strength 680MPa have no progeny
Elongation percentage is 28%.
Claims (2)
- A kind of 1. method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel, it is characterised in that by following step It is rapid to carry out：（1）Smelt molten steel, chemical composition by mass percentage containing C 0.03 ~ 0.25%, Si 0.2 ~ 0.5%, Mn 1 ~ 1.5%, Al≤ 0.01%, V 0.02 ~ 0.1%, P 0.003 ~ 0.01%, S 0.001 ~ 0.02%, O 0.003 ~ 0.008%, N 0.008 ~ 0.015%, Surplus is Fe；（2）Tundish is preheated to 1100 ~ 1200 DEG C, the molten steel in ladle is poured into twin-roll thin strip continuous casting equipment through tundish In, control pouring temperature is 1520 ~ 1540 DEG C, and roll gap of the molten steel through casting roll is solidified and exported, and export speed is 30 ~ 50m/min, Obtain the Cast Strip that thickness is 2.0 ~ 2.5mm；（3）With 10 ~ 15 DEG C/s 900 ~ 1050 DEG C are cooled to after Cast Strip export casting roll, proceed by a time hot rolling, obtain 1.4 ~ The hot rolled plate of 2.0mm thickness；（4）Hot rolled plate goes out after hot-rolling mill water cooling and is crimped to 550 ~ 650 DEG C, and water cooling rate is 20 ~ 45 DEG C/s, and it is thin to obtain low-carbon Strip, yield strength are 430 ~ 490MPa, and tensile strength is 680 ~ 740MPa, and elongation after fracture is 15 ~ 28%.
- 2. the method according to claim 1 for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel, The volume fraction of acicular ferrite is 50 ~ 95% in low-carbon Thin Strip Steel described in being characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016620.XA CN106756529B (en) | 2016-11-18 | 2016-11-18 | The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611016620.XA CN106756529B (en) | 2016-11-18 | 2016-11-18 | The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106756529A CN106756529A (en) | 2017-05-31 |
| CN106756529B true CN106756529B (en) | 2018-06-26 |
Family
ID=58968995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611016620.XA Active CN106756529B (en) | 2016-11-18 | 2016-11-18 | The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106756529B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109338210B (en) * | 2017-09-27 | 2021-06-29 | 江苏沙钢集团有限公司 | Pickling plate and production method thereof |
| CN110079728B (en) * | 2019-04-09 | 2020-07-10 | 东北大学 | High-strength twisted steel with good weldability and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104959561B (en) * | 2015-07-09 | 2017-12-01 | 东北大学 | A kind of method for improving double roller continuous casting low-carbon micro steel-alloy acicular ferrite content |
| CN104894474B (en) * | 2015-07-10 | 2017-03-08 | 东北大学 | A kind of V N microalloying Q550 rank medium plate and preparation method thereof |
-
2016
- 2016-11-18 CN CN201611016620.XA patent/CN106756529B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106756529A (en) | 2017-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103305770B (en) | A kind of manufacture method of thin strap continuous casting 550MPa level high-strength air corrosion-resistant steel band | |
| CN102041367B (en) | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel | |
| CN101927432B (en) | Manufacturing method of high-manganese strip steel with high strength and plasticity | |
| CN107287489B (en) | Based on the method completely without head bar strip continuous casting and rolling flow path production titanium micro-alloyed steel | |
| Zhang et al. | Microstructure, texture and magnetic properties of strip-cast 1.3% Si non-oriented electrical steels | |
| CN106435358B (en) | A kind of manufacture method of new-energy automobile driving motor high intensity non-orientation silicon steel | |
| CN103305753B (en) | A kind of thin strap continuous casting low-carbon microalloy steel band manufacture method | |
| CN103305760B (en) | A kind of thin strap continuous casting 550MPa grade high-strength weathering steel manufacture method | |
| CN102069167B (en) | Method for preparing oriented silicon steel isometric crystal thin strip blank by twin-roll thin strip continuous casting | |
| CN102199720A (en) | Low carbon steel sheet with yield strength over 400MPa and manufacturing method thereof | |
| CN106521317B (en) | A kind of manufacturing method containing acicular ferrite low-carbon Thin Strip Steel | |
| CN105274430A (en) | Production method of ultra-thin specification hot rolling punching steel with tensile strength of 390-510 MPa | |
| CN108486480B (en) | Manufacturing method of thin-specification hot-rolled dual-phase steel plate | |
| CN104294155A (en) | Ultra-low carbon oriented silicon steel and preparation method thereof | |
| CN106868399B (en) | A kind of two-phase TRIP steel strips and preparation method thereof | |
| CN102069165A (en) | Method for preparing non-oriented silicon steel columnar crystal thin strip blank by twin-roll thin strip continuous casting | |
| CN108796190A (en) | A kind of short flow process of Thin Specs high manganese steel sheet | |
| CN104959561B (en) | A kind of method for improving double roller continuous casting low-carbon micro steel-alloy acicular ferrite content | |
| CN106756529B (en) | The method for improving acicular ferrite volume fraction in double-roller rolling low-carbon Thin Strip Steel | |
| CN108588560B (en) | Method for manufacturing continuous casting low-carbon micro-alloy thin strip steel containing superfine acicular ferrite | |
| CN100372964C (en) | Non-orientation electrical steel and its making process | |
| CN107164693B (en) | A kind of preparation method based on the high silicon steel cold-strip steel of thin strap continuous casting | |
| CN106756528B (en) | A kind of high nitrogen medium managese steel strip and its near-net forming preparation method | |
| CN104962811B (en) | A kind of twin-roll thin strip continuous casting fine grain orientation silicon steel thin made-up belt and its manufacture method | |
| JPH0380846B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |