CN101994065B - 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof - Google Patents
550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof Download PDFInfo
- Publication number
- CN101994065B CN101994065B CN2010105019858A CN201010501985A CN101994065B CN 101994065 B CN101994065 B CN 101994065B CN 2010105019858 A CN2010105019858 A CN 2010105019858A CN 201010501985 A CN201010501985 A CN 201010501985A CN 101994065 B CN101994065 B CN 101994065B
- Authority
- CN
- China
- Prior art keywords
- cold
- weather resistance
- percent
- rolling
- rolled steel
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The invention discloses a 550Mpa cold-rolled steel plate with good weather resistance and a preparation method thereof. A steel billet continuous casting and rolling flow is adopted, wherein refined molten steel comprises the following main chemical compositions in percentage by weight: 0.03 to 0.07 percent of C, 0.10 to 0.50 percent of Si, 0.35 to 1.0 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.010 percent of S, 0.25 to 0.50 percent of Cu, 0.25 to 0.80 percent of Cr, 0.05 to 0.30 percent of Ni, 0.03 to 0.10 percent of Ti and the balance of Fe and inevitable impurities; and in the annealing process, the steel is annealed in a cover-type annealing furnace in a temperature range from 500 DEG C to the Al transition point. The cold-rolled steel plate with the good weather resistance has the yield strength of more than 550Mpa and the elongation of over 8 percent, and also has good machinability and weather resistance.
Description
Technical field
The present invention relates to a kind of 550MPa level and have cold-rolled steel sheet of excellent weather resistance and preparation method thereof.
Background technology
For the weight that alleviates the freight container or the vehicles etc. or prolong its work-ing life; Traditional way is higher stainless steel of use cost or aluminium class material; This series products has all required for example bendability, weldability and endurance quality, and High Strength Steel Plate can substitute the use of the expensive material of this type.Intensity through improving steel plate is come attenuate steel plate used thickness, not only can practice thrift manufacturing cost, and the unit oil consumption that can lower transportation simultaneously significantly improves conveying efficiency.
At present; To the existing a lot of reports of the research of high-strength weathering steel; For example; Publication number CN101225498 600MPa grade high-strength weathering steel and preparation method thereof; This 600MPa grade high-strength weathering steel adopts electric furnace-bar strip continuous casting and rolling flow path preparation, prepares that the main chemical compositions of molten steel is after the refining of this high-strength weathering steel: C:0.045～0.07wt%, Si:0.10～0.29wt%, Mn:0.8～1.5wt%, P:0.005～0.030wt%, S:0.002～0.008wt%, Cu:0.20～0.5wt%, Cr:0.3～0.7wt%, Ni:0.15～0.35wt%, Ti:0.06～0.079wt%, Nb:0.035～0.050wt%, Alt:0.025～0.050wt%.Owing to receive the restriction of hot rolling unit thickness aspect, the thickness of the weather-resistant steel plate that the employing hot rolling is produced is generally thicker, and along with the raising of armor plate strength, the thickness limit of the hot-rolled steel sheet that can supply also thickens thereupon.In order to adapt to the demand of steel plate attenuate, the high strength cold-rolled weathering steel series of demand exploitation thinner thickness.Simultaneously, the surface quality of hot-rolled steel sheet, dimensional precision and the cold-rolled steel sheet with excellent weather resistance differ more, can't replace mutually, therefore do not have comparability.Table 1 is depicted as chemical ingredients (wt%), process characteristic and the finished product kind and the performance of adding the high-strength weathering steel of microalloy element in the prior art.
Table 1
Continuous table 1
Up to the present; High-intensity cold-rolled steel sheet is had more research, but to promptly needing higher intensity, the cold-rolled steel sheet research that has good weather resistance again concurrently is less; For example, Korean Patent (publication number CN101558178A) has the cold-rolled steel sheet of high-yield-ratio and excellent weather resistance.Steel are reheated to 1150 to 1300 ℃, 850 to 950 ℃ of finish rolling; The rate of cooling that per second is 20 to 40 ℃; Batch at 500 to 650 ℃; The cold rolling said steel that batch; With at 500 ℃ to A
1Make said steel continuous annealing in the TR of transition point.Korean Patent (publication number CN 101553586A) has the formable high strength cold-rolled steel sheet of excellent weather resistance, steel is reheated to 1150 to 1300 ℃, 750 to 930 ℃ finish rolling; Batch at 400 to 650 ℃; The cold rolling said steel that batch; At (A
1Transition point+30 ℃) to (A
3Transition point or following) the said CRS of continuous annealing is to make 10 to 30% the low-temperature transformation structure and the ferrite structure of surplus under the temperature condition.This technology is through the hot-rolled sheet of producing in the traditional process and then through cold rolling and continuous annealing process; The shortcoming of this method is to cast behind the liquid steel refining; Reheat was to high temperature after strand needed earlier from the high temperature cooling to the room temperature, so complex procedures, and energy consumption is high; Simultaneously, all add a large amount of noble metals such as Nb, B, Co in this patent as enhancing ingredients, cost of alloy is high, technology controlling and process is complicated; This can increase the rolling power of depressing of cold-rolled process and increase production cost simultaneously.
Publication number CN 101376950A discloses a kind of method of manufacture of superhigh intensity cold rolling weather resisting steel; Wherein slab reheat temperature is 1250 ℃, finishing temperature >=Ar3, and curling temperature is 500～650 ℃; Annealing temperature is 680～790 ℃, and cold roling reduction is 40～65%.Same this technology is through the hot-rolled sheet of producing in the traditional process and then through cold rolling and continuous annealing process, complex procedures, and energy consumption is high; Simultaneously, all add a large amount of noble metals such as Nb, Ti, Mo in this patent as enhancing ingredients, cost of alloy is high, technology controlling and process is complicated; This can increase the rolling power of depressing of cold-rolled process and increase production cost simultaneously.
Common cold rolling high-strength steel adopts the continuous annealing furnace annealing, and the continuous annealing furnace investment is big, annealing process is complicated, particularly needs technologies such as quick cooling, the technological operation difficulty.The continuous annealing line general requirement is in batches big, continuous production, and for not having continuous annealing line or receive the steel grade of the restriction of continuous annealing line production dimensions, bell-type annealing can short run, many specifications, many variety production.
Summary of the invention
The objective of the invention is to overcome the defective of prior art, a kind of 550MPa grade high-strength cold-rolled steel sheet with excellent weather resistance and workability be provided, this steel plate satisfy fully freight container, the vehicles to as thin as a wafer, the demand of high tensile steel plate more.
For realizing above-mentioned purpose, the present invention has taked following technical scheme:
A kind of 550MPa level has the preparation method of the cold-rolled steel sheet of excellent weather resistance; Adopt bar strip continuous casting and rolling flow path; Comprise the steps: mainly that electric furnace or converter smelting, refining, sheet blank continuous casting, continuously cast bloom soaking, hot continuous rolling, laminar flow cool off, batch, cold rolling, annealing, finishing
Wherein, The main chemical compositions of molten steel is after the refining: C:0.03～0.07wt.%, Si:0.10～0.50wt.%, Mn:0.35～1.0wt.%, P :≤0.020wt.%, S :≤0.010wt.%, Cu:0.25～0.50wt.%, Cr:0.25～0.80wt.%, Ni:0.05～0.30wt.%, Ti:0.03～0.10wt.%; All the other are Fe and unavoidable impurities
In the said annealing process, said steel are annealed in bell type annealing furnace and the steel behind the bell-type annealing are not more than 1% finishing amount at 500 ℃.
Preferably, in the said cold-rolling process, cold roling reduction >=20%; More preferably, said cold roling reduction is 20～35%.
Preferably, said annealing temperature is 580-660 ℃.
Preferably, the processing parameter of said bar strip continuous casting and rolling flow path is: 900～1000 ℃ of strand charging temperatures, 1100～1180 ℃ of tapping temperatures, 870～930 ℃ of finishing temperatures, 500～650 ℃ of coiling temperatures.
Preferably, said coiling temperature is 580～640 ℃.
The present invention also provides the cold-rolled steel sheet that is had excellent weather resistance by the 550MPa level of method for preparing, and its microstructure is a ferritic, and unit elongation is at least 8%.
Preferably; Said 550MPa level has that the main chemical compositions of molten steel is after the cold-rolled steel sheet refining of excellent weather resistance: C:0.04～0.065wt.%, Si:0.10～0.20wt.%, Mn:0.40～0.8wt.%, P :≤0.020wt.%, S :≤0.010wt.%, Cu:0.25～0.35wt.%, Cr:0.30～0.60wt.%, Ni:0.05～0.25wt.%, Ti:0.05～0.08wt.%, all the other are Fe and unavoidable impurities.
The function analysis of each chemical ingredients is following in the molten steel of the present invention:
C: the scope of carbon is 0.03wt.% to 0.07wt.%; Add C for strengthening armor plate strength; The content that strengthens C can increase the tensile strength of steel plate, simultaneously with steel in formations TiC precipitates such as trace element such as Ti intensity is had reinforced effects, but when the excessive C of adding; The workability of steel and welding property can descend, so the C amount is less than 0.07wt.%.Si: silicon is used for deoxidation of molten steel and reinforcement sosoloid effectively.
Si and Fe at high temperature form fine and close Fe at the steel surface layer
2SiO
4Oxide compound plays the effect that improves erosion resistance.Be fully to obtain these effects, can add the Si of at least 0.1% amount.Therefore, should add Si and improve weathering resistance, but excessive Si can reduce weldability, coating and plastic performance, therefore, but the Si of the amount of the as many as 0.5% of add-on.
Mn: manganese is used to strengthen sosoloid effectively, and very important aspect increase steel strength and hot rolling workability.Yet owing to can form MnS, Mn also can hinder the ductility and the workability of steel.A spot of Mn is favourable for workability, but also can cause steel strength not enough.The Mn that therefore, can add the amount of 0.35wt.% at least is to reach required intensity.On the other hand, Mn is a kind of metallic element of costliness, and excessive Mn can reduce economical efficiency, and harmful to welding and shaping.The Mn that therefore, can add the amount of as many as 1.0wt.%.
P: phosphorus can strengthen the weathering resistance of steel, therefore can add a large amount of P to strengthen erosion resistance.But P can cause the center segregation of steel.Therefore, a large amount of P can reduce weldability and formability.The P that therefore, can add the amount of as many as 0.02wt.%.
S: sulphur is effective to increase erosion resistance, but when with steel in Mn when combining, they can form non-metallic inclusion, and are big to influence, therefore, the add-on of S is controlled at as many as 0.01%.
Cu: copper can form stable rusty scale under aggressive atmosphere, thereby strengthens erosion resistance.For obtaining required erosion resistance, can add 0.25% or more Cu, yet too much Cu can cause crystal boundary cracking in the casting process, the add-on of Cu is controlled at as many as 0.5%.
Cr: chromium is similar to Cu, can form stable rusty scale, be to obtain erosion resistance and intensity, can add at least 0.25% Cr, but too much Cr can cause crevice corrosion and increase cost, and the add-on of Cr is controlled at as many as 0.8%.
Ni: nickel generally can stop the steel that add Cu in castingprocesses cleaved, limit portion fine fisssure, and can strengthen erosion resistance, and the Ni that can add at least 0.05% amount is to realize above-mentioned effect.Yet when the amount of Ni surpasses 0.3%, can weaken erosion resistance, and since too much this expensive alloying element of use increase cost, the add-on of Ni is controlled at as many as 0.3%.
Ti: titanium can postpone ferritic recrystallize, and can combine with N with the C of steel and separated out by deposition, strengthens the intensity of steel plate thus, be to obtain desirable strength, can add the Ti of 0.03～0.10wt.%.
Hot rolling technology of the present invention adopts the controlled rolling and controlled cooling technology; Especially; Adopt higher finishing temperature (help rolling stability in the course of hot rolling, guarantee that good template and thickness deviation control are to help the direct motion of follow-up cold-rolling process); Adopt reasonably coiling temperature (helping obtaining tiny TiC precipitate particle) simultaneously, select lower cold rolling draft (help reducing the cold rolling drag, reduce cold rolling cost).Common cold rolling high-strength steel adopts the continuous annealing furnace annealing, and the continuous annealing furnace investment is big, annealing process is complicated, particularly needs technologies such as quick cooling; The technological operation difficulty; And coil of strip of the present invention is annealed in bell type annealing furnace, adopts lower annealing temperature simultaneously, in relatively low TR, carries out bell-type annealing; The carbon of microalloy element Ti, nitride can alligatoring with the stability of proof strength, thereby save the energy and improved annealing efficiency.Low annealing temperature can also improve the work-ing life of stove.
Compared with prior art, the present invention has following beneficial effect:
1. the present invention passes through to adopt single Ti micro-alloying technology, controlled rolling and annealing process, and production process control is simple, production efficiency is high; The Ti element is with respect to other micro alloying element resources are abundanter, price is lower, product cost is low.
2. the cold-rolled steel sheet with excellent weather resistance of the present invention is under lower cold roling reduction; Bell-type annealing under the lesser temps; The ys of the cold-rolled steel sheet with excellent weather resistance that obtains surpasses 550MPa; Unit elongation has good processability and good weather resistance simultaneously greater than 8%.
3. the present invention has solved the big problem of Ti microalloyed steel performance inconsistency effectively through controlled rolling and controlled cooling technology and rational bell-type annealing technology.
Description of drawings
Fig. 1 is the metallographic structure photo that 550MPa level of the present invention has the cold-rolled steel sheet of excellent weather resistance.
Embodiment
The present invention will be described below to enumerate specific embodiment.It is pointed out that embodiment only is used for the present invention is described further, do not represent protection scope of the present invention, nonessential modification and adjustment that other people make according to the present invention still belong to protection scope of the present invention.
The chemical ingredients scope of setting according to the present invention; Embodiment of the invention 1-6 is through following concrete technical process: mainly with chemical ingredients C; Si, Mn, S; P and Fe are raw material, carry out electric furnace or converter smelting, refining process to molten steel carry out Alloying Treatment (adding a small amount of Cu, Cr, Ni, Mn, Ti alloy), sheet blank continuous casting, strand direct heating/soaking, hot continuous rolling, roll back laminar flow water cooling, batch, flow preparation such as pickling, cold rolling, annealing, finishing form.
Table 2 and table 3 are respectively each chemical composition of steel of embodiment 1-6 and preparation technology parameter.
Table 2
Table 3
The mechanical property of the cold-rolled steel sheet that table 4 embodiment 1-6 obtains with excellent weather resistance
As shown in table 4; The ys of the cold-rolled steel sheet with excellent weather resistance that embodiment 1-6 obtains all surpasses 8% greater than 550MPa, unit elongation; The cold-rolled steel sheet with excellent weather resistance that embodiment 1-6 obtains does not ftracture in BENDING PROCESS, can make the high strength cold rolled steel plate with workability and excellent weather resistance.
Compared to embodiment 1-3; Embodiment 4-6 is a preferred version; The preferred final resulting product performance of each processing parameter not only satisfy the demand of intensity; The stable 560-620MPa that is controlled at of ys, elongation control has comparatively ideal processability at 16-24% in the use of material simultaneously.
Soak into the corrosion test method with reference to TB/T 2375 railways with the weathering steel cycle, the steel plate in the his-and-hers watches 2 has carried out atmospheric exposure test.TP: adopt the dried wetted perimeter phase to soak into corrosion test machine equipment, the NaHSO of sample solution: 0.01mol/L
3Solution (PH=4.4～4.8), computational analysis sample accelerated corrosion speed in the regular hour.Weather resistance is seen table 5.
The weather resistance of the cold-rolled steel sheet of table 5 embodiment 1-6 and comparative steel 1,2 with excellent weather resistance
As shown in table 5, the average corrosion rate of the cold-rolled steel sheet with excellent weather resistance of embodiment 1-6 and comparative steel 1 (common weathering steel SPA-H) are suitable, are 4.545W (g/m far below the average corrosion rate of comparative steel 2
2H), therefore, the cold-rolled steel sheet with excellent weather resistance of embodiment 1-6 demonstrates excellent weathering resistance.
Claims (5)
1. a 550MPa level has the preparation method of the cold-rolled steel sheet of excellent weather resistance; It is characterized in that; Adopt bar strip continuous casting and rolling flow path; Comprise the steps: mainly that electric furnace or converter smelting, refining, sheet blank continuous casting, continuously cast bloom soaking, hot continuous rolling, laminar flow cool off, batch, cold rolling, annealing, finishing
Wherein, The chemical ingredients of molten steel is after the refining: C:0.03～0.07wt.%, Si:0.10～0.50wt.%, Mn:0.35～1.0wt.%, P :≤0.020wt.%, S :≤0.010wt.%, Cu:0.25～0.50wt.%, Cr:0.25～0.80wt.%, Ni:0.05～0.30wt.%, Ti:0.03～0.10wt.%; All the other are Fe and unavoidable impurities
The processing parameter of said bar strip continuous casting and rolling flow path is: 900～1000 ℃ of strand charging temperatures, 1100～1180 ℃ of tapping temperatures, 870～930 ℃ of finishing temperatures, 500～650 ℃ of coiling temperatures;
In the said annealing process, to the TR of A1 transition point, said steel are annealed in bell type annealing furnace at 500 ℃;
In the said cold-rolling process, said cold roling reduction is 20～35%.
2. preparation method according to claim 1 is characterized in that, said annealing temperature is 580-660 ℃.
3. preparation method according to claim 1 is characterized in that, said coiling temperature is 580～640 ℃.
4. the 550MPa level by each said method preparation of claim 1-3 has the cold-rolled steel sheet of excellent weather resistance, and its microstructure is a ferritic, and unit elongation is at least 8%.
5. 550MPa level according to claim 4 has the cold-rolled steel sheet of excellent weather resistance; It is characterized in that; The chemical ingredients of molten steel is after the said refining: C:0.04～0.065wt.%, Si:0.10～0.20wt.%, Mn:0.40～0.8wt.%, P :≤0.020wt.%, S :≤0.010wt.%, Cu:0.25～0.35wt.%, Cr:0.30～0.60wt.%, Ni:0.05～0.25wt.%, Ti:0.05～0.08wt.%, all the other are Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105019858A CN101994065B (en) | 2010-09-30 | 2010-09-30 | 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105019858A CN101994065B (en) | 2010-09-30 | 2010-09-30 | 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101994065A CN101994065A (en) | 2011-03-30 |
| CN101994065B true CN101994065B (en) | 2012-07-18 |
Family
ID=43784813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105019858A Expired - Fee Related CN101994065B (en) | 2010-09-30 | 2010-09-30 | 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101994065B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103305760B (en) * | 2012-03-14 | 2015-12-02 | 宝山钢铁股份有限公司 | A kind of thin strap continuous casting 550MPa grade high-strength weathering steel manufacture method |
| CN103266274B (en) * | 2013-05-22 | 2015-12-02 | 宝山钢铁股份有限公司 | A kind of superhigh intensity cold rolling weather resisting steel plate and manufacture method thereof |
| CN105603320B (en) * | 2016-01-04 | 2017-05-17 | 唐山钢铁集团有限责任公司 | Method for producing container plate by means of thin slab casting and rolling |
| CN107262532A (en) * | 2017-05-31 | 2017-10-20 | 舞阳钢铁有限责任公司 | A kind of heating rolling production method of ultra-wide stainless steel plate |
| CN107058873A (en) * | 2017-05-31 | 2017-08-18 | 武汉钢铁有限公司 | Rel >=550MPa railway containers steel and method are produced with CSP |
| CN108342662B (en) * | 2018-02-23 | 2020-03-10 | 柳州钢铁股份有限公司 | High-strength weathering steel with yield strength of 550MPa |
| CN111719082A (en) * | 2020-05-06 | 2020-09-29 | 唐山不锈钢有限责任公司 | Hot-rolled weather-resistant steel strip and flexible manufacturing method thereof |
| CN111926261A (en) * | 2020-08-31 | 2020-11-13 | 日照钢铁控股集团有限公司 | High-strength weathering steel with yield strength of 550MPa and production method thereof |
| CN115637391B (en) * | 2022-11-07 | 2023-05-12 | 鞍钢股份有限公司 | 550MPa grade sulfuric acid dew point corrosion resistant rare earth steel and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785543A (en) * | 2005-08-31 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of producing Ti micro alloyed high weather resistant steel plate using thin plate blank continuous casting continuous milling process |
| CN101265550A (en) * | 2008-04-30 | 2008-09-17 | 武汉钢铁(集团)公司 | Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof |
-
2010
- 2010-09-30 CN CN2010105019858A patent/CN101994065B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1785543A (en) * | 2005-08-31 | 2006-06-14 | 广州珠江钢铁有限责任公司 | Technology of producing Ti micro alloyed high weather resistant steel plate using thin plate blank continuous casting continuous milling process |
| CN101265550A (en) * | 2008-04-30 | 2008-09-17 | 武汉钢铁(集团)公司 | Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101994065A (en) | 2011-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101994065B (en) | 550Mpa cold-rolled steel plate with good weather resistance and preparation method thereof | |
| CN107557678B (en) | Inexpensive 550MPa grades of hot rolling container weathering steel and its manufacturing method | |
| CN102758133B (en) | 1000MPa-level automobile steel with high product of strength and elongation and manufacturing method thereof | |
| CN102199723B (en) | High-strength cold-rolled hot-galvanized precipitation reinforced steel and manufacturing method thereof | |
| CN108796363B (en) | High-surface-quality aluminum-coated substrate steel suitable for large deformation and stamping and production method thereof | |
| CN102409222B (en) | Continuously annealed or hot galvanized cold rolled transformation induced plasticity steel plate and preparation method thereof | |
| CN102839329B (en) | Cold-rolling double-phase-steel steel plate with tensile strength of 450 MPa, and preparation method thereof | |
| CN102304664A (en) | High strength and high plasticity aluminum-containing medium manganese transformation-induced plasticity (TRIP) cold-rolled steel plate and preparation method thereof | |
| CN102409235A (en) | High-strength cold rolling transformation induced plasticity steel plate and preparation method thereof | |
| CN101932742A (en) | High-strength hot-dip-galvanized steel sheet having excellent moldability, and method for production thereof | |
| CN112430787B (en) | Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof | |
| CN107779740B (en) | Yield strength 700MPa grade atmospheric corrosion resistant hot rolled strip and manufacturing method | |
| CN110878386A (en) | Low-cost hot-galvanized phase-change induced plasticity steel and preparation method thereof | |
| CN103114257A (en) | Acid-washing-free high-strength crossbeam steel with stable oxide layer and preparation method of steel | |
| CN108570605A (en) | High-strength high-plasticity low-density steel plate based on double roller continuous casting and its manufacturing method | |
| CN109609845A (en) | A kind of 500MPa grades of weathering steel and its production method | |
| CN101376950A (en) | Superhigh intensity cold rolling weather resisting steel plate and manufacturing method thereof | |
| CN109023130A (en) | Economical medium managese steel of cold rolling containing Nb of one kind and preparation method thereof | |
| CN114525452B (en) | Hot-dip galvanized low-alloy high-strength steel with yield strength of 700Mpa level and preparation method thereof | |
| CN113751679B (en) | Manufacturing method of cobalt-free maraging steel cold-rolled thin strip | |
| CN102011060A (en) | 700MPa-grade cold rolled steel plate with high weather resistance and preparation method thereof | |
| CN102703810A (en) | Automobile steel with low carbon equivalent and production method thereof | |
| CN101942600A (en) | Preparation method of transformation-induced plasticity (TRIP) medium-manganese hot-rolled steel sheet | |
| CN107419179B (en) | High-strength and high-toughness microalloyed Al-containing medium manganese hot rolled steel plate and preparation method thereof | |
| CN108866435B (en) | A kind of automobile combined microalloying medium managese steel and its manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120718 Termination date: 20140930 |
|
| EXPY | Termination of patent right or utility model |