CN107043889A - A kind of automobile welded tube cold rolled narrow strip and preparation method thereof - Google Patents
A kind of automobile welded tube cold rolled narrow strip and preparation method thereof Download PDFInfo
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- CN107043889A CN107043889A CN201710197151.4A CN201710197151A CN107043889A CN 107043889 A CN107043889 A CN 107043889A CN 201710197151 A CN201710197151 A CN 201710197151A CN 107043889 A CN107043889 A CN 107043889A
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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
- 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
- C21D8/0236—Cold rolling
-
- 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
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- 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 Sheet Steel (AREA)
Abstract
The invention discloses a kind of high-strength vehicle welded tube cold rolled narrow strip and preparation method thereof, its described cold rolled narrow strip chemical composition is included by weight percentage：C：0.10% 0.20%, Si：0.05% 0.50%, Mn：1.15% 1.75%, S：≤ 0.035%, P：≤ 0.035%, 0.025%≤V≤0.06%, N：≤ 0.006%, O：≤ 0.004%, remaining is iron Fe and inevitable impurity.The cold rolled narrow strip thickness specification of the present invention is in 0.5 2.0mm, width range is 180 480mm, the vehicle structure square and rectangular pipe generated after cold roll forming, high-frequency welding, yield strength is in more than 700MPa, elongation percentage is more than 10%, the square and rectangular pipe of big thickness is substituted, the requirement of national automotive light weight technology can be met, the utilization rate of material is improved.
Description
Technical field
The invention belongs to cold rolled automobile steel production technical field, in particular it relates to which a kind of high-strength vehicle is welded
Effective cold rolled narrow strip and preparation method thereof.
Background technology
To meet the development trend of energy-saving and emission-reduction and automotive light weight technology, car body weight is reduced, the use of high strength steel is improved
Ratio turns into the important directions of current truck manufacturing industry.This kind of high-strength steel is anti-mainly for the manufacture of motor vehicle body and high intensity
Guard bar structure part etc., can be greatly reduced the weight of truck, reduce oil consumption, reduce the discharge of pollutant.Hot rolling broadband
The steel market price be higher than ribbon steel, and certain customers because cold mill complex it is smaller, it is necessary to will after wide flat steel slitting roll, further increase
The production cost of ribbon steel is added.Cold rolling arrowband high-strength steel manufacturing process technology controlled level is increased substantially, for realize with
The hot rolling low level product of the cold rolling narrow high strength products substitution think gauge of Thin Specs, which is provided, to be ensured.Product is possessing high intensity
While, there is excellent shock resistance and cold bending performance again, the component of preparation is not easy to crack.
Manufacture the current method of high strength cold-rolled narrow steel plate and generally comprise three classes.
The first method for preparing high strength cold-rolled narrow steel plate is by improving Mn members on the basis of common carbon manganese structural steel composition
Cellulose content improves intensity.It is strong that such as Chinese patent application CN104294145A discloses a kind of tension based on bell-type annealing processing
600MPa grades of cold-rolled steels are spent, its chemical composition is by weight percentage：C:0.10-0.17%；Si≤0.3%；Mn:1.5-
2.0%；P≤0.02%；S≤0.01%；N≤0.008%；Al:0.02-0.05%；O:≤ 0.004%；Remaining is for iron and not
Impurity can be avoided.The yield strength of steel obtained by this application is more than 500MPa, and tensile strength is more than 600MPa, elongation percentage 15-25%.
The method for preparing high strength cold-rolled narrow steel plate second is to improve intensity by the method for phase transformation strengthening.Such as China
Patent application CN101871078A discloses a kind of superhigh intensity cold rolling strip or steel plate, its by weight percentage chemistry into
It is divided into：C：0.08-0.18%, Si：0.1-0.6%, Mn：1.4-2.4%, P：≤ 0.02%, S：≤ 0.005%, Al：0.01-
0.05%, N：≤ 0.006%, Cr：0.1-0.4%, B/N：0.2-0.77, remaining is Fe and inevitable impurity.The superelevation
The manufacture method of strength cold-rolled steel sheet, by being tempered after hot rolling, cold rolling, continuous annealing and quenching, obtaining final hardening constituent is
Martensite+ferrite dual phase tissue.
The third method for preparing high strength cold-rolled narrow steel plate is to improve intensity by the method for microalloying.As in
State patent application CN101956139A discloses a kind of method for preparing yield strength 700MPa grade high-strength cold-rolled steel sheets, uses
The flow such as bar strip continuous casting and rolling flow path, cold rolling, annealing, finishing is prepared from；Wherein, after refining molten steel main chemical compositions
For：C：0.03-0.07wt.%, Si：≤ 0.35wt.%, Mn：0.40-2.0wt.%, P：≤ 0.020wt.%, S≤
0.010wt.%, Cr：0.25-0.80wt.%, Ti：0.06-0.25wt.%, remaining is Fe and inevitable impurity, prepared
High strength cold rolled steel plate yield strength more than 700MPa, elongation percentage is more than 5%.
Although the problem of cold rolling arrowband high strength steel plate hardly possible manufacture that above-mentioned technical scheme is solved to a certain extent,
It is that above-mentioned technical scheme has certain defect, such as preparation technology is complicated, the problem of cost is higher.
The content of the invention
An object of the present invention is to provide a kind of high-strength vehicle welded tube cold rolled narrow strip, and it is cold that the present invention is provided
Ribbon steel yield strength is rolled in more than 700MPa, and elongation percentage is particularly suitable for the higher high-performance vapour of plasticity requirements more than 10%
The preparation of the structural members such as car welded tube, meets requirement of the automobile steel to low cost, high intensity, good plasticity and forming property.
The high-strength vehicle welded tube cold rolled narrow strip that the present invention is provided, its chemical composition contains C by weight percentage：
0.10%-0.20%, Si：0.05%-0.50%, Mn：1.15%-1.75%, S：≤ 0.035%, P：≤ 0.035%,
0.025%≤V≤0.06%, N：≤ 0.006%, O：≤ 0.004%, remaining is iron Fe and inevitable impurity.
It is used as above-mentioned technical proposal a kind of preferably selection, high-strength vehicle welded tube cold rolled narrow strip by weight hundred
Divide and contain C than meter：0.16%-0.20%, Si：0.25%-0.50%, Mn：1.35%-1.55%, S：≤ 0.035%, P：≤
0.035%, N：≤ 0.006%, O：≤ 0.004%, 0.035%≤V≤0.06%, remaining is iron and inevitable impurity.
As a kind of preferably selection of above-mentioned technical proposal, the high-strength vehicle welded tube cold rolled narrow strip has iron element
Body+pearlite is matrix, and Dispersed precipitate has bainite structure, and grain size is at 11 grades.
Another object of the present invention is to provide the preparation method of the high-strength vehicle welded tube cold rolled narrow strip, the party
Method include the Stands Cold Tandem Mill of 620mm hot rollings-five it is cold rolling-step such as bell-type annealing, specifically include：
1) 620mm hot rollings
Thickness is heated to 1150-1270 DEG C of temperature, heat time 60-90 minute for 120mm continuous casting billet in heating furnace；
The non-reversible roughing roughing of single pass is carried out afterwards, and middle sotck thinkness is 20-25mm, 880-950 DEG C of hot rolling finishing temperature, poker temperature
Difference control is within 30 DEG C；Coiling temperature uses 650-720 DEG C, hot-rolled finished product thickness 2.5-3.5mm；The high-strength vehicle weldering
The rolled microstructure of effective cold rolled narrow strip is based on ferrite+pearlite, and grain size is at 9 grades or so：
2) it is cold rolling
Hot-rolled finished product pickling is removed into scale on surface and rewinding is carried out；Then carried out on five Stands Cold Tandem Mills cold
Roll, the thickness of the obtained ribbon steel total reduction 80-88% in 0.5-2.0mm, cold-rolled process；
3) bell-type annealing
Cold rolling finished product is subjected to bell-type annealing, 620-740 DEG C of annealing temperature, soaking time 9-15h, temperature retention time after annealing
For 24-30h.
The thickness of steel band or steel plate produced by the present invention is in 0.5-2.0mm.
Preferably selected as above-mentioned technical proposal is a kind of, in 620mm hot-rolled steps, middle sotck thinkness is 20-22mm,
880-930 DEG C of hot rolling finishing temperature, coiling temperature uses 650-700 DEG C；
Preferably selected as above-mentioned technical proposal is a kind of, in bell-type annealing step, 670-700 DEG C of annealing temperature, insulation
Temperature retention time is 25-28h after time 10-12h, annealing.
High-strength vehicle welded tube of the present invention can reach following combination property with cold rolled narrow strip, according to different finger gauges
Lattice, yield strength is in more than 700MPa, and elongation percentage more than 10%, after tested, steel processability and welding performance of the present invention are good
It is good.
The process of the present invention, technology controlling and process is simple, and yield strength is made in more than 700MPa, elongation percentage 10% with
On steel band, thickness is fully able to meet automobile welded tube in 0.5-2.0mm, and with good processability and plasticity
It is required that.
Step 1 in the above-mentioned technique of the present invention) alleged by continuous casting billet be the steel-making that is, before hot rolling as made from prior art
Process presses prior art, carries out molten iron pretreatment, converter smelting, refining by the Design of Chemical Composition requirement of the present invention and connects
The continuous casting billet that the methods such as casting are obtained.
What the rolling mill practice of the present invention was realized in conventional hot continuous rolling machine machine and common cold continuous rolling.Carried out using VN alloy
Microalloying, during high temperature rolling, can separate out VN particles, give full play to V precipitation strength effect and solution strengthening effect.
More than steel yield strength 700MPa after cold rolling, bell-type annealing, elongation percentage has reached more than 10%, with it is good it is cold into
The steel band of type performance, disclosure satisfy that the demand of automobile welded tube.
The annealing process of the present invention uses bell-type annealing, it is possible to achieve small lot, multi items, the production of many specifications, annealing temperature
Degree is low, and technique is simple, and workable, cost is low.The present invention bell-type annealing temperature need strict guarantee 620-740 DEG C it
Between, soaking time control after 9-15h, annealing temperature retention time in the range of 24-30h.
High-strength vehicle welded tube cold rolled narrow strip of the present invention, can be realized in conventional hot continuous rolling machine machine, common cold continuous rolling
Fabricated with bell-type annealing equipment, possessing low-cost advantage simultaneously, yield strength realizes more than 700MPa ranks, extended
Rate is more than 10%；With good cold formability energy and plasticity, automobile welded tube requirement is met.
Brief description of the drawings
Fig. 1, it is cold rolled annealed after metallographic structure；
Fig. 2, rolled metallographic structure.
Embodiment
With embodiment, the present invention is further detailed explanation below.
By following technological process prepare continuous casting billet according to the chemical composition ranges that table 1 is set, with chemical composition C, Si, Mn,
P, S, V and Fe are raw material, and the pretreatment of progress molten iron, converter smelting, refining, continuous casting, strand are directly heated or soaking.Continuous casting billet
Preparation according to before hot rolling steel making working procedure prior art carry out.
Table 1, chemical composition (wt%, balance iron)
| Embodiment | C | Si | Mn | P | S | V |
| 1 | 0.19 | 0.38 | 1.45 | 0.03 | 0.02 | 0.042 |
| 2 | 0.18 | 0.36 | 1.43 | 0.026 | 0.027 | 0.039 |
| 3 | 0.2 | 0.42 | 1.46 | 0.03 | 0.021 | 0.045 |
Embodiment 1
It is cold that the preparation method of high-strength vehicle welded tube cold rolled narrow strip of the present invention includes the frame of 620mm hot rollings-five
Tandem mill is cold rolling-step such as bell-type annealing, it is specially：
1) 620mm hot rollings
Thickness of strand is 120mm, 1200 DEG C of heating-up temperature in heating furnace, 70 minutes heat times；Carry out single pass
Non-reversible roughing roughing, middle sotck thinkness is 23mm, and 900 DEG C of hot rolling finishing temperature, the poker temperature difference is controlled within 30 DEG C；Volume
Temperature is taken to use 680 DEG C, hot-rolled finished product thickness 2.75mm；The rolled of the high-strength vehicle welded tube cold rolled narrow strip is microcosmic
Tissue is based on ferrite+pearlite, and grain size is in 9 grades or so, metallographic structure such as Fig. 2：
2) it is cold rolling
Hot-rolled finished product pickling is removed into scale on surface and rewinding is carried out；Then carried out on five Stands Cold Tandem Mills cold
Roll, the thickness of obtained ribbon steel total reduction 85% in 0.6mm, cold-rolled process；
3) bell-type annealing
By cold rolling finished product carry out bell-type annealing, 690 DEG C of annealing temperature, soaking time 11h, after annealing temperature retention time be 25h.
The yield strength of steel band is in 730MPa after annealing, and elongation percentage is 11%.
The present invention high-strength vehicle welded tube cold rolled narrow strip microstructure be using ferrite+pearlite as matrix,
Dispersed precipitate has a small amount of bainite structure, and grain size is at 11 grades or so, and its metallographic structure is as shown in Figure 1.
Embodiment 2
It is cold that the preparation method of high-strength vehicle welded tube cold rolled narrow strip of the present invention includes the frame of 620mm hot rollings-five
Tandem mill is cold rolling-bell-type annealing, it is specially：
1) 620mm hot rollings
Thickness of strand is 120mm, 1230 DEG C of heating-up temperature in heating furnace, 80 minutes heat times；Carry out single pass
Non-reversible roughing roughing, middle sotck thinkness is 22mm, and 890 DEG C of hot rolling finishing temperature, the poker temperature difference is controlled within 25 DEG C；Volume
Temperature is taken to use 690 DEG C, hot-rolled finished product thickness 3.0mm；
2) it is cold rolling
Hot-rolled finished product pickling is removed into scale on surface and rewinding is carried out；Then carried out on five Stands Cold Tandem Mills cold
Roll, the thickness of obtained ribbon steel total reduction 80% in 0.8mm, cold-rolled process；
3) bell-type annealing
By cold rolling finished product carry out bell-type annealing, 700 DEG C of annealing temperature, soaking time 12h, after annealing temperature retention time be 26h.
The yield strength of steel band is in 720MPa after annealing, and elongation percentage is 10%.
Embodiment 3
It is cold that the preparation method of high-strength vehicle welded tube cold rolled narrow strip of the present invention includes the frame of 620mm hot rollings-five
Tandem mill is cold rolling-step such as bell-type annealing, it is specially：
1) 620mm hot rollings
Thickness of strand is 120mm, 1180 DEG C of heating-up temperature in heating furnace, 65 minutes heat times；Carry out single pass
Non-reversible roughing roughing, middle sotck thinkness is 24mm, and 920 DEG C of hot rolling finishing temperature, the poker temperature difference is controlled within 30 DEG C；Volume
Temperature is taken to use 710 DEG C, hot-rolled finished product thickness 2.5mm；
2) it is cold rolling
Hot-rolled finished product pickling is removed into scale on surface and rewinding is carried out；Then carried out on five frame cold-rolling mills cold
Roll, the thickness of obtained ribbon steel total reduction 82% in 0.5mm, cold-rolled process；
3) bell-type annealing
By cold rolling finished product carry out bell-type annealing, 720 DEG C of annealing temperature, soaking time 13h, after annealing temperature retention time be 27h.
The yield strength of steel band is in 740MPa after annealing, and elongation percentage is 10%.
Those of ordinary skill in the art it should be appreciated that the embodiment of the above be intended merely to explanation the present invention,
And be not used as limitation of the invention, as long as in the spirit of the present invention, the change to embodiment described above
Change, modification will all fall in the range of claims of the present invention.
Claims (5)
1. a kind of automobile welded tube cold rolled narrow strip, it is characterised in that the high-strength vehicle welded tube is with cold rolled narrow strip by weight
Amount percentage is made up of following chemical composition meter：C：0.10%-0.20%, Si：0.05%-0.50%, Mn：1.15%-
1.75%, S：≤ 0.035%, P：≤ 0.035%, 0.025%≤V≤0.06%, N：≤ 0.006%, O：≤ 0.004%, its
Remaining is iron Fe and inevitable impurity.
2. automobile welded tube cold rolled narrow strip according to claim 1, it is characterised in that the cold rolled narrow strip is by weight
Percentage is made up of following chemical composition meter：C：0.16%-0.20%, Si：0.25%-0.50%, Mn：1.35%-1.55%,
S：≤ 0.035%, P：≤ 0.035%, 0.035%≤V≤0.06%, N：≤ 0.006%, O：≤ 0.004%, remaining be iron and
Inevitable impurity.
3. the preparation method of automobile welded tube cold rolled narrow strip, comprises the following steps：
1) 620mm hot rollings
Thickness of strand is 120mm, 1150-1270 DEG C of heating-up temperature in heating furnace, heat time 60-90 minute；Carry out single
The non-reversible roughing roughing of passage, middle sotck thinkness is 20-25mm, and 880-950 DEG C of hot rolling finishing temperature, poker temperature difference control exists
Within 30 DEG C；Coiling temperature uses 650-720 DEG C, hot-rolled finished product thickness 2.5-3.5mm；
2) it is cold rolling
Hot-rolled finished product pickling is removed into scale on surface and rewinding is carried out；Then carried out on five Stands Cold Tandem Mills it is cold rolling,
The thickness of obtained ribbon steel is in 0.5-2.0mm；
3) bell-type annealing
By cold rolling finished product carry out bell-type annealing, 620-740 DEG C of annealing temperature, soaking time 9-15h, temperature retention time is after annealing
24-30h。
4. preparation method as claimed in claim 3, it is characterised in that total reduction 80-88% in cold rolling step.
5. preparation method as claimed in claim 3, it is characterised in that in bell-type annealing step, 650-700 DEG C of annealing temperature,
Soaking time 10-12h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197151.4A CN107043889A (en) | 2017-03-29 | 2017-03-29 | A kind of automobile welded tube cold rolled narrow strip and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710197151.4A CN107043889A (en) | 2017-03-29 | 2017-03-29 | A kind of automobile welded tube cold rolled narrow strip and preparation method thereof |
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| CN107043889A true CN107043889A (en) | 2017-08-15 |
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| CN201710197151.4A Pending CN107043889A (en) | 2017-03-29 | 2017-03-29 | A kind of automobile welded tube cold rolled narrow strip and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604242A (en) * | 2017-08-02 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | Cold rolled automobile sheet and preparation method thereof |
| CN108396242A (en) * | 2018-01-10 | 2018-08-14 | 唐山钢铁集团有限责任公司 | A kind of low cost welded tube superhigh intensity cold rolling continuous annealing strip and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866182A (en) * | 2014-03-20 | 2014-06-18 | 莱芜钢铁集团有限公司 | Low-cost manufacturing method of 700 MPa-grade cold-rolled high-strength steel and thin steel strip based on cover annealing treatment |
| CN104294145A (en) * | 2014-10-20 | 2015-01-21 | 山东钢铁股份有限公司 | Bell-type annealing treatment-based cold rolled steel with tensile strength of 600MPa, and preparation method thereof |
| CN104419865A (en) * | 2013-08-31 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Cold-rolled tin plate for easy-to-open lid and production method of cold-rolled tin plate |
-
2017
- 2017-03-29 CN CN201710197151.4A patent/CN107043889A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104419865A (en) * | 2013-08-31 | 2015-03-18 | 上海梅山钢铁股份有限公司 | Cold-rolled tin plate for easy-to-open lid and production method of cold-rolled tin plate |
| CN103866182A (en) * | 2014-03-20 | 2014-06-18 | 莱芜钢铁集团有限公司 | Low-cost manufacturing method of 700 MPa-grade cold-rolled high-strength steel and thin steel strip based on cover annealing treatment |
| CN104294145A (en) * | 2014-10-20 | 2015-01-21 | 山东钢铁股份有限公司 | Bell-type annealing treatment-based cold rolled steel with tensile strength of 600MPa, and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604242A (en) * | 2017-08-02 | 2018-01-19 | 包头钢铁（集团）有限责任公司 | Cold rolled automobile sheet and preparation method thereof |
| CN107604242B (en) * | 2017-08-02 | 2020-02-21 | 包头钢铁（集团）有限责任公司 | Cold-rolled automobile sheet and preparation method thereof |
| CN108396242A (en) * | 2018-01-10 | 2018-08-14 | 唐山钢铁集团有限责任公司 | A kind of low cost welded tube superhigh intensity cold rolling continuous annealing strip and its production method |
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