CN104651712A - CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof - Google Patents
CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof Download PDFInfo
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- CN104651712A CN104651712A CN201510118522.6A CN201510118522A CN104651712A CN 104651712 A CN104651712 A CN 104651712A CN 201510118522 A CN201510118522 A CN 201510118522A CN 104651712 A CN104651712 A CN 104651712A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—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
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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)
- Coating With Molten Metal (AREA)
Abstract
The invention relates to deep-drawing steel plates and production processes thereof and in particular relates to a low-yield strength high-ductility CQ-grade hot-dip galvanization steel strip for an anti-theft door plate and a production process of the steel strip. The steel strip comprises the following chemical components in percentage by mass: 0.030-0.060 percent of C, less than or equal to 0.03 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.020-0.055 percent of Als and the balance of iron and inevitable impurities. According to the optimized composition design, the process parameters of hot rolling, cold rolling and hot galvanizing procedures are adjusted and optimized, the yield strength of the product is reduced, and the product ductility is improved. According to inspection, the yield strength of the product disclosed by the invention is 230-260MPa, the elongation is 35-38 percent, and the maximum stamping depth is 20mm.
Description
Technical field
The present invention relates to deep-draw shaped steel plate and production technique thereof, specifically a kind of low surrender high-elongation antitheft door door-plate CQ level pot galvanize steel band and production technique thereof, belong to technical field of metallurgical sheet production.
Background technology
At present, steel theft-proof door good market prospect is larger to the demand of pot galvanize roll bending.Present stage is for making the antitheft door door-plate of press depth comparatively dark (below 20mm), flower pattern complexity, it requires that galvanized sheet has good plasticity and certain punching performance, the CQ galvanized sheet that common process is produced, because yield strength is higher, in stress strain curve, upper and lower yield point elongation is more obvious, and in the process of following process antitheft door, easily in deformation place appearance warpage in various degree, be only applicable to make below press depth 5mm, the simple anti-theft door plate of flower pattern.Method comparatively ripe at present mainly adopts SPHD to be substrate, under cold rolling, then produce galvanized sheet by the continuous annealing of galvanization production line, but performance surplus capacity is comparatively large, and purchase cost is higher.
Summary of the invention
Technical problem to be solved by this invention is, there is provided a kind of there is explicit costs advantage, there is low yield strength, there is the antitheft door door-plate CQ level pot galvanize steel band of high-elongation and production technique thereof, not enough and DQ level galvanized sheet performance surplus capacity is comparatively large and the problem that purchase cost is higher with the performance solving the CQ galvanized sheet that common process is produced, the performance of described galvanized sheet meets the service requirements of deep-draw type antitheft door.
The present invention solves described problem, and the technical scheme of employing is:
A kind of antitheft door door-plate CQ level pot galvanize steel band, chemical composition mass percent is: C:0.030 ~ 0.060%, Si≤0.03%, Mn:0.15-0.25%, P≤0.020%, S≤0.015%, Als:0.020 ~ 0.055%, all the other are for iron and be inevitably mingled with.
On mentioned component basis, the strict gas content controlled in steel band, i.e. T [O]≤30ppm; T [N]≤30ppm.
The production technique of above-mentioned antitheft door door-plate CQ level pot galvanize steel band, comprising: steel-making, and hot rolling is cold rolling;
In described steelmaking process, converter smelting endpoint mass percent is: C≤0.06%, S≤0.03%, P≤0.018%, connects and waters temperature: 1594 ~ 1604 DEG C;
In described course of hot rolling, strand start rolling temperature is 1080 ~ 1130 DEG C, finishing temperature 880 ~ 900 DEG C, coiling temperature 680 ~ 720 DEG C;
Described cold-rolled process, comprises cold rolling, zinc-plated, polishing, straightening processing step, wherein:
(1) in cold rolling process, cold rolling draft controls 70% ~ 80%;
(2) in zinc-plated operation, the highest annealing temperature of continuous annealing furnace controls at 720 ~ 740 DEG C, and unit speed is 80-90m/min;
(3) in polishing/straightening process, straightening elongation control is 1.3% ~ 1.5%.
According to the present invention of technique scheme, coiling temperature adopts high temperature coiling, and temperature controls at 680 ~ 720 DEG C, and higher temperature is conducive to promoting the gathering of AlN and growing up, and avoids stoping growing up of ferrite crystal grain in the process of follow-up zinc-plated operation annealing; Cold rolling draft controls at 70%-80%, is conducive to controlling at the motivating force of zinc-plated operation annealing recrystallization subsequently and Recrystallization nucleation point; Adopt the annealing process of temperature raising reduction of speed abundant recrystallize occurs to make steel plate and fully grows up in annealing process, thus be conducive to the yield strength reducing product, improve the unit elongation of product; Smooth elongation control, 1.3% ~ 1.5%, effectively can eliminate the yield point elongation of the stress strain curve of product.
Compared with prior art, unusual effect of the present invention and technical characterstic as follows:
(1) the present invention is on the basis of conventional CQ level hot-rolled sheet, by optimizing hot rolling, cold-rolling process, effectively raises the processability of anti-theft door plate.
(2) maximum press depth reaches 20mm, and yield strength in kind reaches 225-240Mpa, and elongation is 35-38%.
Embodiment
Below in conjunction with embodiment, the present invention is further elaborated, but these embodiments do not form any restriction to the present invention.
Embodiment 1: deep-draw type anti-theft door plate galvanized sheet finished product thickness 0.6mm, chemical composition mass percent is: C:0.05%, Si:0.011%, Mn:0.16%, P:0.015%, S:0.009%, Als:0.025%, Fe: surplus; Gas content T [O] in steel: 25ppm, T [N]: 20ppm.
Main processes and parameter: in hot-rolled process, coiling temperature 700 DEG C; Hot-rolled sheet thickness 3.0mm, Cold Rolled Plate Thickness is 0.58mm, and cold rolling draft is 80%; Annealing heating section temperature 730 DEG C in zinc-plated operation, soaking zone temperature 720 DEG C, unit speed 90m/min, straightening elongation control is 1.4%.The yield strength of finished product is 240Mpa, and unit elongation is 36%.
Embodiment 2: deep-draw type anti-theft door plate galvanized sheet finished product thickness 0.7mm, chemical composition mass percent is: C:0.05%, Si:0.010%, Mn:0.16%, P:0.017%, S:0.007%, Als:0.024%, T [O]: 27ppm, Fe: surplus; In steel gas content T [N]: 23ppm.
Main processes and parameter: in hot-rolled process, coiling temperature 697 DEG C; Hot-rolled sheet thickness 3.0mm, Cold Rolled Plate Thickness is 0.68mm, and cold rolling draft is 77%; Annealing heating section temperature 740 DEG C in zinc-plated operation, soaking zone temperature 730 DEG C, unit speed 85m/min, straightening elongation control is 1.5%.The yield strength of finished product is 230Mpa, and unit elongation is 35%.
Embodiment 3: deep-draw type anti-theft door plate galvanized sheet finished product thickness 0.8mm, chemical composition mass percent is: C:0.06%, Si:0.011%, Mn:0.18%, P:0.015%, S:0.009%, Als:0.030%, Fe: surplus; Gas content T [O] in steel: 20ppm, T [N]: 25ppm.
Main processes and parameter: in hot-rolled process, coiling temperature 703 DEG C; Hot-rolled sheet thickness 3.0mm, Cold Rolled Plate Thickness is 0.78mm, and cold rolling draft is 73%; Annealing heating section temperature 740 DEG C in zinc-plated operation, soaking zone temperature 730 DEG C, unit speed 80m/min, straightening elongation control is 1.5%.The yield strength of finished product is 235Mpa, and unit elongation is 38%.
Comprehensive above-described embodiment, the present invention is compared with common process, and main improvements are embodied in following four aspects:
(1) hot rolling technology of conventional zinc-plated substrate, for meeting the needs of follow-up cold rolling manufacturing procedure, requires that finished product grain size number reduces, coarsened grain, and the yield strength reducing steel.Therefore at hot-rolled process, adopt high temperature coiling, oiler temperature control is at 680 ~ 720 DEG C, high temperature coiling object is that the ferrite crystal grain of hot rolled coil is grown up, promote the gathering of AlN and grow up, such hot rolling technology is combined with continuous annealing process, avoids stoping growing up of ferrite crystal grain in the process of follow-up zinc-plated operation annealing.Produce according to the method described above, ferrite crystal grain obtains effectively grows up, and after testing, grain size number controls in 8-9 level.
(2) according to continuous cold rolling unit instrument and supplies feature, the accumulation draft general control of conventional tandem rolling is at 65-75%.General for carbon aluminium-killed steel, under same hot-rolling coiling temperature, the average Lankford r value of steel plate improves along with the increase of cold rolling draft, occurs peak value when draft is between 70%-80%.Cold rolling draft, in order to meet corresponding zincincation and mechanical property requirements, in cold-rolled process, is set as 70%-80% by the present invention, creates conditions for next step annealing produces high annealing texture.
(3) the present invention is in conjunction with the adjustment of cold rolling draft, and annealing temperature is improve 100 DEG C on original basis, and the parameter after Optimization Technology is: heating zone temperature 730 ± 20 DEG C; Soaking zone temperature 720 ± 20 DEG C, and suitably reduce unit speed between 85-95m/min, ensure that the reduction effect of ferrite crystal grain.
(4) reasonably straightening technique can not only improve template, can also eliminate yield point elongation, improve the anisotropy of material.The present invention, in order to eliminate yield point elongation during product tension test, prevents steel plate finished product from impact briquetting process, occurring Lüders bands defect.By the repeatedly debugging in production process, by straightening elongation control at 1.3%-1.5%, under this technique, in stress strain curve, upper and lower yield strength overlaps substantially.
Compared with the zinc-plated door-plate that the galvanizing production produced under above technique and common process are produced, yield strength in kind reaches 225-250Mpa, and elongation is 34-38%, as shown in table 1.
Table 1 product performance of the present invention and common process galvanized sheet contrast
The foregoing is only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention, the equivalence change that all utilizations description of the present invention is done, be all contained within interest field of the present invention.
Claims (3)
1. an antitheft door door-plate CQ level pot galvanize steel band, it is characterized in that, chemical composition mass percent is: C:0.030 ~ 0.060%, Si≤0.03%, Mn:0.15-0.25%, P≤0.020%, S≤0.015%, Als:0.020 ~ 0.055%, all the other are for iron and be inevitably mingled with.
2. antitheft door door-plate CQ level pot galvanize steel band according to claim 1, it is characterized in that, the Control of gas content in described steel band is: T [O]≤30ppm; T [N]≤30ppm.
3. a production technique for antitheft door door-plate CQ level pot galvanize steel band as claimed in claim 1, comprising: steel-making, and hot rolling is cold rolling; It is characterized in that:
In described steelmaking process, converter smelting endpoint mass percent is: C≤0.06%, S≤0.03%, P≤0.018%, connects and waters temperature: 1594 ~ 1604 DEG C;
In described course of hot rolling, strand start rolling temperature is 1080 ~ 1130 DEG C, finishing temperature 880 ~ 900 DEG C, coiling temperature 680 ~ 720 DEG C;
Described cold-rolled process, comprises cold rolling, zinc-plated, polishing, straightening processing step, wherein:
(1) in cold rolling process, cold rolling draft controls 70% ~ 80%;
(2) in zinc-plated operation, the highest annealing temperature of continuous annealing furnace controls at 720 ~ 740 DEG C, and unit speed is 80-90m/min;
(3) in polishing/straightening process, straightening elongation control is 1.3% ~ 1.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118522.6A CN104651712A (en) | 2015-03-18 | 2015-03-18 | CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510118522.6A CN104651712A (en) | 2015-03-18 | 2015-03-18 | CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof |
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| CN104651712A true CN104651712A (en) | 2015-05-27 |
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| CN201510118522.6A Pending CN104651712A (en) | 2015-03-18 | 2015-03-18 | CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648321A (en) * | 2016-01-22 | 2016-06-08 | 唐山国丰钢铁有限公司 | Production process for barrel-making hot dip galvanized steel strip |
| CN106893932A (en) * | 2017-03-08 | 2017-06-27 | 唐山国丰钢铁有限公司 | A kind of appliance plate production technology of hot-galvanized steel band |
| CN109332377A (en) * | 2018-08-27 | 2019-02-15 | 山西太钢不锈钢精密带钢有限公司 | 301 accurate band steel production technologies of cylinder liner |
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| US20100116832A1 (en) * | 2007-04-26 | 2010-05-13 | Jfe Steel Corporation | Steel sheet for can and method for manufacturing the same |
| CN101906570A (en) * | 2010-09-02 | 2010-12-08 | 唐山国丰钢铁有限公司 | Tinning substrate for deep-punching food can and production method thereof |
| CN102732780A (en) * | 2012-06-18 | 2012-10-17 | 首钢总公司 | Hot galvanized plate used for refrigerator outer plate, and production method thereof |
| CN103469060A (en) * | 2013-08-30 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Cold-rolled steel plate for stamping household appliances and manufacturing method thereof |
| CN104073730A (en) * | 2014-07-24 | 2014-10-01 | 唐山国丰钢铁有限公司 | Stamping narrow-strip-steel and ultra-fast cooling production process thereof |
-
2015
- 2015-03-18 CN CN201510118522.6A patent/CN104651712A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100116832A1 (en) * | 2007-04-26 | 2010-05-13 | Jfe Steel Corporation | Steel sheet for can and method for manufacturing the same |
| CN101906570A (en) * | 2010-09-02 | 2010-12-08 | 唐山国丰钢铁有限公司 | Tinning substrate for deep-punching food can and production method thereof |
| CN102732780A (en) * | 2012-06-18 | 2012-10-17 | 首钢总公司 | Hot galvanized plate used for refrigerator outer plate, and production method thereof |
| CN103469060A (en) * | 2013-08-30 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Cold-rolled steel plate for stamping household appliances and manufacturing method thereof |
| CN104073730A (en) * | 2014-07-24 | 2014-10-01 | 唐山国丰钢铁有限公司 | Stamping narrow-strip-steel and ultra-fast cooling production process thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105648321A (en) * | 2016-01-22 | 2016-06-08 | 唐山国丰钢铁有限公司 | Production process for barrel-making hot dip galvanized steel strip |
| CN106893932A (en) * | 2017-03-08 | 2017-06-27 | 唐山国丰钢铁有限公司 | A kind of appliance plate production technology of hot-galvanized steel band |
| CN109332377A (en) * | 2018-08-27 | 2019-02-15 | 山西太钢不锈钢精密带钢有限公司 | 301 accurate band steel production technologies of cylinder liner |
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Application publication date: 20150527 |
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