CN101294260A - High-strength stainless cold-rolled steel strip and method for manufacturing same - Google Patents
High-strength stainless cold-rolled steel strip and method for manufacturing same Download PDFInfo
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- CN101294260A CN101294260A CNA2007100398413A CN200710039841A CN101294260A CN 101294260 A CN101294260 A CN 101294260A CN A2007100398413 A CNA2007100398413 A CN A2007100398413A CN 200710039841 A CN200710039841 A CN 200710039841A CN 101294260 A CN101294260 A CN 101294260A
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Abstract
The invention discloses a high-strength nonrust cold-rolled steel strip, and a manufacture method. The high-strength nonrust cold-rolled steel strip comprises the chemical compositions by percentage composition as follows: C is less than or equals to 0.01, Si is 0.2 to 1.00, Mn is 0.2 to 1.0, P is less than or equals to 0.040, S is less than or equals to 0.015, Cr is 16.5 to 19.5, N is less than or equals to 0.01, Ti is 0.2 to 0.6, and the others are Fe and ineluctable impurities. The invention has the manufacture method that: (1) the smelting is performed for casting to form proximate matters, and galvanomagnetism is adopted to stir during the process of continuous casting; (2) in the hot rolling step, plate blanks are heated to reach 950 to 1200 DEG C by a mill furnace, and then are air-cooled until the room temperature is reached after curliness; (3) in the cold rolling step, the pickling and the annealing are performed first, the annealing temperature ranges from 920 to 1050 DEG C, then the multi-pass rolling is performed, and the overall reduction amount reaches 60 to 75 percent; finally, the pickling and the annealing are performed on the cold-rolled steel strip, the annealing temperature ranges from 900 to 1050 DEG C, and the coil of strip is cooled until the temperature is lower than 550 DEG C. The elements with exorbitant price such as Mo, etc. are not used in the method, and the finished products of the steel strip have good ductility and higher hardness.
Description
Technical field
The present invention relates to stainless cold-rolled steel strip, particularly a kind of low-cost high-strength stainless cold-rolled steel strip and manufacture method thereof.
Background technology
Produce the microstructure of Cr17 type ferrite stainless strip steel at present both at home and abroad based on ferrite, and add a small amount of trace alloying element titanium, niobium etc. and improve the corrosion resisting property of steel and improve intensity, the steel grade that has also adds Mo, but because Mo valency rise in recent years adds the cost increase that Mo can make steel.Table 1 is the standard analysis of international ferritic stainless steel of the same type.
The trade mark of table 1 steel and chemical ingredients (wt%)
| Country origin | The trade mark | C | Si | Mn | P | S | Cr | Ti | N |
| The U.S. | ASTM439 | ≤ 0.03 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 17.0-19.0 | 0.2+4×(C+N) ~1.10 | - |
| Korea S | POS439 | ≤ 0.01 | ≤ 0.40 | ≤ 0.40 | ≤ 0.040 | ≤ 0.030 | 17.0-19.0 | 0.2+4×(C+N) ~1.10 | ≤ 0.01 |
| Japan | SUS430 | ≤ 0.12 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 16.0-18.0 | - | - |
| Japan | SUS434 | ≤ 0.12 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 16.0-18.0 | Mo：0.75-1.25 | - |
| Japan | SUS444 | ≤ 0.025 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 17.0-20.0 | Mo：1.75-2.50 Nb：8(C+N) ~0.80 | 0.025 |
In the listed steel grade of table 1, to not containing the steel grade of Mo, the C that has, N content are higher, and the Si that has, Mn content is on the low side, and intensity and unit elongation are lower slightly; To containing the Mo steel grade, yield strength or tensile strength slightly improve, and unit elongation does not change, and still, add Mo and can cause production cost to improve.By table 1 simultaneously as can be seen, U.S.'s trade mark is ASTM439, is limited on its carbon content≤0.03wt%; Be limited to≤0.12wt% on Japan trade mark SUS430 and the SUS434 carbon content; Korea S's trade mark is POS439, and silicon, manganese upper content limit be≤0.4wt%, has added 0.75-1.25wt%Mo among the Japanese trade mark SUS434, and Japanese trade mark SUS444 has added 1.75-2.5%Mo and small amount of N b.The concrete mechanical property correlation data of the steel grade of above each trade mark is seen Table 2.
The mechanical property of five trade mark steel grades of table 2
| ASTM439 | SUS430 | POS439 | SUS434 | SUS444 | |
| Tensile strength (MPa) | 415Min | 420Min | 420Min | 450Min | 410Min |
| 0.2% yield strength (MPa) | 215Min | 205Min | 230Min | 205Min | 245Min |
| Unit elongation (%) | 22Min | 22Min | 21Min | 22Min | 20Min |
| Hardness (HV) | 180Max | 200Max | 170Max | 200Max | 230Max |
As shown in Table 2, added 0.75-1.25wt%Mo in the SUS434 steel, its tensile strength improves a lot; Add 1.75-2.5%Mo and few stable element nb in the SUS444 steel, its yield strength significantly increases.The mechanical property of other three trades mark is approaching, and intensity and unit elongation are slightly inadequate.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of high-strength stainless cold-rolled steel strip and manufacture method thereof that does not contain Mo, makes the cold rolled strip performance of manufacturing satisfy high-intensity requirement.
For solving the problems of the technologies described above, technical scheme provided by the invention is:
A kind of high-strength stainless cold-rolled steel strip is characterized in that the weight percent proportioning of chemical ingredients is:
C≤0.01, Si 0.2～1.00, Mn 0.2～1.0, P≤0.040, S≤0.015, Cr16.5～19.5, N≤0.01, Ti 0.2～0.6, all the other are Fe and unavoidable impurities.
C≤0.01, C is carbide forming element and austenite former, can improve the intensity of steel, if but its content is higher than standard-required, and the extension property of steel can descend, thereby reduces the plasticity of steel greatly.
Si:0.2～1.00, Si is a ferrite former, can increase the ferritic structure ratio; Yield strength to the raising steel is favourable.
Mn:0.2～1.00, Mn is an austenite former, in Cr17 shaped steel, adds the intensity that a certain amount of manganese can improve steel.If but the content of Mn is higher than standard-required, there is austenite (high temperature) in the steel, cool off improper meeting and form residual austenite, cause the matrix of steel inhomogeneous, make cold rolled strip be not easy distortion, reduce the plasticity of steel.
P :≤0.040, P is a unavoidable impurities element in the steel, high phosphorus content is unfavorable to welding.
S :≤0.015, S is a unavoidable impurities element in the steel, high sulphur content is unfavorable to the solidity to corrosion of steel.
Cr:16.5～19.5, Cr is anti-oxidant (corrosion) element, also is ferrite former, can improve the solidity to corrosion of steel, the ferritic structure of increase, stabilized steel.
N :≤0.01, N is an austenite former, can increase the ratio of the high temperature austenite tissue of steel.But its content surpasses when a certain amount of, can endanger the extension property of ferritic steel.
Ti:0.2～0.6, Ti is a stabilizing element, can form stable compound Ti (C, N) with C, N etc., plays the effect of fixation of C, N in steel, improves the corrosion resistance nature of steel.
The manufacture method of high-strength stainless cold-rolled steel strip the steps include:
1) metallurgy and foundry becomes base, and casting process adopts induction stirring that the proportion of equiaxed grain of slab section is reached more than 35%.The molten steel that will meet the composition requirement pours into slab at continuous caster, adopt induction stirring that proportion of equiaxed grain is reached more than 35% in two cold-zones in the casting process, slab is cut into desired length after, slab is cooled to room temperature, with emery wheel clear board blank surface defects, deliver to the process furnace heating.
2) hot rolling, slab is heated to 950～1200 ℃ through process furnace, removes the high temperature oxidation iron sheet through high pressure water, be rolled into the band steel at the milling train multi-pass, and curl into coil of strip, 750～900 ℃ of finishing temperatures, 350～700 ℃ of the temperature of curling, band steel are rolled the back air cooling to room temperature.
3) cold rolling, coils of hot-rolled steel at first carries out pickling annealing, 920～1050 ℃ of annealing temperatures, annealing time 1～5min; Carry out the multi-pass cold rolling again, total reduction 60～75%; At last to cold-rolling steel strip pickling annealing, 900～1050 ℃ of annealing temperatures, annealing time 1～3min; Coil of strip is cooled to below 550 ℃.
Preferably, described step 2) in, slab heating temperature can be 1000～1100 ℃, 850 ± 30 ℃ of finishing temperatures, 650 ± 30 ℃ of the temperature of curling.
Preferably, in the described step 3), the annealing temperature of hot rolled strip can be 920～980 ℃, and the annealing temperature of cold rolled strip can be 900～960 ℃.
The present invention compared with prior art has following beneficial effect:
1. the present invention controls lower C, N content, i.e. (C+N)≤0.02%, the Si, the Mn element that add q.s add stabilizing element Ti, form a small amount of Ti (C, N), refinement crystal grain, make the band steel finished product of producing obtain unit elongation and enough yield strengths preferably.The finished strip yield strength reaches more than the 280MPa, and unit elongation reaches more than 25%.
Make finished product possess good prolong plasticity and higher intensity in, avoided expensive elements such as use Mo, reduced production cost.
Embodiment
Steel band chemical component weight per distribution ratio of the present invention is: C≤0.01, Si 0.2～1.00, Mn0.2～1.0, P≤0.040, S≤0.015, Cr 16.5～19.5, N≤0.01, Ti 0.2～0.6, all the other are Fe and unavoidable impurities.Steel band adopts metallurgy and foundry to become base, hot rolling, the manufacturing of cold-rolling process method, and the embodiment that the existing different chemical ingredients of weight lifting amount per-cent is done is as follows:
Embodiment 1
The chemistry weight percent is: C≤0.005, Si 0.2, Mn 1.0, P≤0.040, S≤0.015, Cr 16.5, N≤0.01, Ti 0.2, all the other are Fe and unavoidable impurities.Its processing parameter is: slab heating temperature ℃ is 950, and strip finishing temperature ℃ is 750, and coiling temperature ℃ is 350, the hot rolling annealing temperature ℃ is 1050, and the cold coiling annealing temperature ℃ is 996, and performance index are: yield strength MPa is 295, tensile strength MPa is 450.29, and unit elongation % is 25.5.
Embodiment 2
The chemistry weight percent is: C≤0.006, Si 0.32, Mn 0.81, P≤0.021, S≤0.004, Cr 17.2, N≤0.009, Ti 0.25, all the other are Fe and unavoidable impurities.Its processing parameter is: slab heating temperature ℃ is 1020, and strip finishing temperature ℃ is 795, and coiling temperature ℃ is 415, the hot rolling annealing temperature ℃ is 995, and the cold coiling annealing temperature ℃ is 945, and performance index are: yield strength MPa is 290.5, tensile strength MPa is 461.3, and unit elongation % is 28.0.
Embodiment 3
The chemistry weight percent is: C≤0.007, Si 0.56, Mn 0.53, P≤0.018, S≤0.004, Cr 18.03, N≤0.008, Ti 0.35, all the other are Fe and unavoidable impurities.Its processing parameter is: slab heating temperature ℃ is 1100, and strip finishing temperature ℃ is 850, and coiling temperature ℃ is 545, the hot rolling annealing temperature ℃ is 965, and the cold coiling annealing temperature ℃ is 1050, and performance index are: yield strength MPa is 280.6, tensile strength MPa is 457.6, and unit elongation % is 26.53.
Embodiment 4
The chemistry weight percent is: C≤0.009, Si 0.85, Mn 0.41, P≤0.015, S≤0.003, Cr 18.91, N≤0.007, Ti 0.50, all the other are Fe and unavoidable impurities.Its processing parameter is: slab heating temperature ℃ is 1150, and strip finishing temperature ℃ is 885, and coiling temperature ℃ is 680, the hot rolling annealing temperature ℃ is 935, and the cold coiling annealing temperature ℃ is 900, and performance index are: yield strength MPa is 302, tensile strength MPa is 435.3, and unit elongation % is 29.7.
Embodiment 5
The chemistry weight percent is: C≤0.01, Si 1.00, Mn 0.20, P≤0.010, S≤0.001, Cr 19.50, N≤0.006, Ti 0.60, all the other are Fe and unavoidable impurities.Its processing parameter is: slab heating temperature ℃ is 1200, and strip finishing temperature ℃ is 900, and coiling temperature ℃ is 700, the hot rolling annealing temperature ℃ is 920, and the cold coiling annealing temperature ℃ is 920, and performance index are: yield strength MPa is 286.3, tensile strength MPa is 442.52, and unit elongation % is 31.8.
The chemical ingredients of table 3 embodiment (wt%)
| Embodiment | C | Si | Mn | P | S | Cr | Ti | N |
| 1 | 0.005 | 0.20 | 1.00 | 0.040 | 0.015 | 16.50 | 0.20 | 0.01 |
| 2 | 0.006 | 0.32 | 0.81 | 0.021 | 0.004 | 17.20 | 0.25 | 0.009 |
| 3 | 0.007 | 0.56 | 0.53 | 0.018 | 0.004 | 18.03 | 0.35 | 0.008 |
| 4 | 0.009 | 0.85 | 0.41 | 0.015 | 0.003 | 18.91 | 0.50 | 0.007 |
| 5 | 0.01 | 1.00 | 0.20 | 0.010 | 0.001 | 19.50 | 0.60 | 0.006 |
Relevant processing parameter and the performance index of table 4 embodiment
| Embodiment | Slab heating temperature (℃) | Strip finishing temperature (℃) | Coiling temperature (℃) | The hot rolling annealing temperature (℃) | The cold coiling annealing temperature (℃) | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) |
| 1 | 950 | 750 | 350 | 1050 | 996 | 295 | 450.29 | 25.5 |
| 2 | 1020 | 795 | 415 | 995 | 945 | 290.5 | 461.3 | 28.0 |
| 3 | 1100 | 850 | 545 | 965 | 1050 | 280.6 | 457.6 | 26.53 |
| 4 | 1150 | 885 | 680 | 935 | 900 | 302 | 435.3 | 29.7 |
| 5 | 1200 | 900 | 700 | 920 | 920 | 286.3 | 442.52 | 31.8 |
In sum, the present invention reduces C, N content in the steel by adjusting the steel grades proportioning, increase silicon, manganese content, change hot-work and cold worked relevant processing parameter, improve the intensity index of ferrite stainless cold rolled strip, and guarantee that band steel unit elongation reaches more than 25%.Improve and stablized the intensity and the plasticity index of steel, production cost reduces relatively.Cold rolling processing resulting strength property in back and unit elongation index all meet the requirements, be applicable to need high strength, plasticity is good and the use occasion of rustless property.As: elevator panel, heating water tank, automobile exhaust pipe etc.
Claims (4)
1. high-strength stainless cold-rolled steel strip is characterized in that the weight percent proportioning is:
C≤0.01, Si 0.2～1.00, Mn 0.2～1.0, P≤0.040, S≤0.015, Cr16.5～19.5, N≤0.01, Ti 0.2～0.6, all the other are Fe and unavoidable impurities.
2. the manufacture method of high-strength stainless cold-rolled steel strip as claimed in claim 1 is characterized in that:
1) metallurgy and foundry becomes base, and casting process adopts induction stirring that the proportion of equiaxed grain of slab section is reached more than 35%;
2) hot rolling, slab is heated to 950～1200 ℃ through process furnace, and multi-pass is rolled into the band steel, and curls into coil of strip, and finishing temperature is 750～900 ℃, and curling temperature is 350～700 ℃, the back air cooling that curls is to room temperature;
3) cold rolling, coils of hot-rolled steel at first carries out pickling annealing, and annealing temperature is 920～1050 ℃, and annealing time is 1～5min; Carry out the multi-pass cold rolling again, total reduction is 60～75%; To cold-rolling steel strip pickling annealing, annealing temperature is 900～1050 ℃, annealing time 1～3min at last; Coil of strip is cooled to below 550 ℃.
3. the manufacture method of high-strength stainless cold-rolled steel strip as claimed in claim 2 is characterized in that, in step 2) in, slab heating temperature is 1000～1100 ℃, and finishing temperature is 850 ± 30 ℃, and curling temperature is 650 ± 30 ℃.
4. the manufacture method of high-strength stainless cold-rolled steel strip as claimed in claim 2 is characterized in that, in step 3), the annealing temperature of hot rolled strip is 920～980 ℃, and the annealing temperature of cold rolled strip is 900～960 ℃.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876029A (en) * | 2009-04-28 | 2010-11-03 | 上海实达精密不锈钢有限公司 | Stainless steel precision steel belt for CPU parts |
| CN102162075A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Austenitic stainless steel with excellent polishing performance and manufacturing method thereof |
| CN101428386B (en) * | 2008-11-06 | 2012-02-01 | 杭州钢铁集团公司 | GCr15 ferrule cold-punching molding method |
| TWI460277B (en) * | 2009-03-16 | 2014-11-11 | Fives Dms Sa | Process and plant for the discontinuous production of a stainless steel strip from a previously hot-rolled steel strip |
| CN107794443A (en) * | 2017-10-18 | 2018-03-13 | 山西太钢不锈钢股份有限公司 | A kind of production method of high-performing car exhaust tube steel |
| CN109023072A (en) * | 2018-09-04 | 2018-12-18 | 合肥久新不锈钢厨具有限公司 | A kind of high stability corrosion-resistant stainless steel and preparation method thereof |
| CN109554517A (en) * | 2018-11-23 | 2019-04-02 | 邢台钢铁有限责任公司 | A kind of method of billet caster production titaniferous ferritic stainless steel small billet |
| CN114082782A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Anti-wrinkling cold rolling method for 443 ultra-pure ferrite stainless steel |
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2007
- 2007-04-24 CN CNA2007100398413A patent/CN101294260A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101428386B (en) * | 2008-11-06 | 2012-02-01 | 杭州钢铁集团公司 | GCr15 ferrule cold-punching molding method |
| TWI460277B (en) * | 2009-03-16 | 2014-11-11 | Fives Dms Sa | Process and plant for the discontinuous production of a stainless steel strip from a previously hot-rolled steel strip |
| CN101876029A (en) * | 2009-04-28 | 2010-11-03 | 上海实达精密不锈钢有限公司 | Stainless steel precision steel belt for CPU parts |
| CN102162075A (en) * | 2010-02-23 | 2011-08-24 | 宝山钢铁股份有限公司 | Austenitic stainless steel with excellent polishing performance and manufacturing method thereof |
| CN107794443A (en) * | 2017-10-18 | 2018-03-13 | 山西太钢不锈钢股份有限公司 | A kind of production method of high-performing car exhaust tube steel |
| CN109023072A (en) * | 2018-09-04 | 2018-12-18 | 合肥久新不锈钢厨具有限公司 | A kind of high stability corrosion-resistant stainless steel and preparation method thereof |
| CN109554517A (en) * | 2018-11-23 | 2019-04-02 | 邢台钢铁有限责任公司 | A kind of method of billet caster production titaniferous ferritic stainless steel small billet |
| CN109554517B (en) * | 2018-11-23 | 2021-05-28 | 邢台钢铁有限责任公司 | Method for producing titanium-containing ferrite stainless steel billet by billet continuous casting machine |
| CN114082782A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Anti-wrinkling cold rolling method for 443 ultra-pure ferrite stainless steel |
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Open date: 20081029 |