CN104831207A - Thin gauge 600MPa grade hot galvanized plate production method - Google Patents
Thin gauge 600MPa grade hot galvanized plate production method Download PDFInfo
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Abstract
The invention relates to a thin gauge 600MPa grade hot galvanized plate production method, and belongs to the technical field of metallurgy plate production. The method is characterized in that the content of carbon in molten steel decarburized and dephosphorized through a converter is controlled in a range of 0.04-0.055mass%, the refining time is longer than 35min, the static blow time is longer than 6min, and refined molten steel comprises 0.05-0.065mass% of C, 0.03mass% or less of Si, 0.25-0.3mass% of Mn, 0.015mass% or less of P, 0.012mass% or less of S, and 0.03-0.06mass% of Als. Thin gauge non-spangle hot galvanized high strength steel with the yield strength of 600MPa or more, the tensile strength of 650MPa or more and the thickness of 0.4-0.5mm is produced through optimizing steelmaking, hot rolling and cold rolling galvanizing technologies, and thin gauge 600MPa grade hot galvanized plates obtained in the invention have the characteristics of high strength, thinness and low cost.
Description
Technical field
The present invention relates to a kind of Thin Specs 600MPa level heat zinc coating plate production method, belong to technical field of metallurgical sheet production.
Background technology
At present, typical hot-dip galvanized high-strength steel mainly contains low-alloy high-strength steel series, structure iron series, two-phase high-strength steel series etc., its yield strength is many at below 550MPa, yield strength is at the GB trade mark only 600MPa level dual phase steel and the 700MPa level Multiphase Steel of more than 600MPa, these steel grades have higher strength and ductility product, active effect is played in energy-saving and emission-reduction and lightweight development, but all add more alloy, manufacturing cost is higher, and adding due to alloy, hot rolling and cold roller and deformed drag comparatively regular tenacity steel grade double, its industrial traditional hot continuous rolling thickness limit of getting the raw materials ready is caused to be 2.3mm, and continuous pickling cold rolling employing thickness 2.3mm hot rolling material can only produce the above specification product of 0.6mm thickness.But in actual applications, the thin slab product in some fields needs to reach higher intensity equally, ensures the non-deformability of product, and reaches light-weighted effect.Therefore, the high-strength heat zinc coating plate developing 0.4 ~ 0.5mm Thin Specs yield strength 600MPa level has great economic and social benefit in this area.
Summary of the invention
The object of this invention is to provide a kind of production method of Thin Specs 600MPa level heat zinc coating plate, the method passes through optimized production process, heat zinc coating plate hot rolling and cold rolling resistance to deformation is reduced while significantly reducing alloy addition reduction smelting cost, make 0.4 ~ 0.5mm thickness product yield strength >=600MPa, tensile strength >=650MPa, unit elongation >=7%.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of Thin Specs 600MPa level heat zinc coating plate production method, described heat zinc coating plate thickness specification is 0.4 ~ 0.5mm, comprises following processing step:
(1), steelmaking-refining-continuous casting: through converter decarburization, the refining in ladle refining furnace of the molten steel after dephosphorization, after refining, continuous casting of molten steel becomes base;
(2), hot rolling: strand, through the heating of process furnace steel, is removed after scale on surface through scale breaker, is entered milling train roughing, after enter finish rolling through the roller-way of the stay-warm case that comes into operation, roll rear section cooling and adopt the intensive cooling of leading portion;
(3), acid is rolled: hot rolling raw material breaks through straightening and carries out acid after phosphorus and pickling and roll;
(4), continuous annealing;
(5), pot galvanize;
Its improvements are: in described step (1), the carbon content control of molten steel after converter decarburization, dephosphorization is at 0.04 ~ 0.055%(mass percent); Refining time is greater than 35min, and the quiet time of blowing is greater than 6min, and after refining, molten steel composition mass percentage is respectively: C:0.05 ~ 0.065%, Si :≤0.03%, Mn:0.25 ~ 0.3%, P :≤0.015%, S :≤0.012%, Als:0.03 ~ 0.06%.
Above-mentioned a kind of Thin Specs 600MPa level heat zinc coating plate production method, in described step (2), strand tapping temperature controls at 1210 ~ 1250 DEG C, remove after scale on surface through scale breaker, enter milling train roughing milling train, start rolling temperature 1050 ~ 1150 DEG C, after roughing, workpiece thickness controls at 37 ~ 42mm, after enter finish rolling through the roller-way of the stay-warm case that comes into operation, finish rolling start rolling temperature 1030 ~ 1070 DEG C, finishing temperature 880 ~ 900 DEG C, gauge control is at 2.0 ~ 2.5mm, roll rear section cooling and adopt the intensive cooling of leading portion, rate of cooling >=40 DEG C/S, coiling temperature 600 ~ 700 DEG C.
Above-mentioned a kind of Thin Specs 600MPa level heat zinc coating plate production method, in described step (3), hot rolling raw material breaks after phosphorus and pickling through straightening, and hot rolling raw material is rolled into 0.4 ~ 0.5mm thickness and rolls hard volume, it is 79 ~ 80% that draft is rolled in acid.
Above-mentioned a kind of Thin Specs 600MPa level heat zinc coating plate production method, in described step (4), continuous annealing soaking temperature controls at 535 ~ 545 DEG C, and annealing speed controls at 120 ~ 130m/min, enters zinc pot temperature and controls at 445 ~ 455 DEG C.
Above-mentioned a kind of Thin Specs 600MPa level heat zinc coating plate production method, in described step (5), zinc pot temperature controls at 450 ~ 470 DEG C, and zinc liquid composition quality percentage composition is respectively: AL:0.020 ~ 0.022%, Fe :≤0.05%, Pb :≤0.003%, Cu :≤0.002%.
The finishing temperature that strand in step of the present invention (2) after roughing carries out finish rolling is set as 880 ~ 900 DEG C, and finishing temperature easily causes hot roll to consume higher than 900 DEG C to be increased, and the iron scale formed is difficult to remove in rear operation; Finishing temperature easily causes hot-rolled finished product surface mixed crystal lower than 880 DEG C; In step (4), continuous annealing soaking temperature is set as 535 ~ 545 DEG C, annealing soak temperature is lower higher than yield strength qualification rate when 550 DEG C, can only 70% be reached, lower than when 530 DEG C because Thin Specs rapid cooling section temperature drop in stove is excessive, enter zinc pot temperature and do not reach 445 DEG C, cause band steel exceed zinc pot induction heating compensation ability from the heat that zinc pot absorbs and make zinc pot temperature not reach zinc-plated optimum temps.
Technical characterstic of the present invention: (1) high-strength steel more traditional on Composition Design have employed less alloy and do not add any microalloy element, reduce hot rolling and cold rolling resistance to deformation while decreasing smelting cost, make cold-rolled products can realize 0.4 ~ 0.5mm thickness specification and produce; (2) hot rolling adopts high-temperature final rolling low temperature to batch, and section cooling adopts the intensive type of cooling, and more traditional laminar flow type of cooling rate of cooling improves 1 times, effectively improves the intensity of cold rolling the finished product; (3) core technology is that continuous annealing pot galvanize adopts accurate low temperature annealing process, annealing temperature and annealing speed is matched, ensure that into zinc pot temperature, reduces annealing cost and ensure that product strength simultaneously.
Positively effect of the present invention:
The present invention is by optimizing steel-making, hot rolling, cold-rolling galvanization technique, produce yield strength >=600MPa, tensile strength >=650MPa, thickness at the Thin Specs of 0.4 ~ 0.5mm scope without zinc flower hot-galvanized high-strength steel, and make product line possess stably manufactured ability, it is high that product has intensity, the features such as thickness is thin, and cost is low.
Embodiment
A kind of Thin Specs 600MPa of the present invention level heat zinc coating plate production method, described heat zinc coating plate thickness specification is 0.4 ~ 0.5mm, comprises following processing step:
(1), steelmaking-refining-continuous casting: through converter decarburization, the carbon content of molten steel after dephosphorization controls at 0.04 ~ 0.055%(mass percent); Refining time is greater than 35min, and the quiet time of blowing is greater than 6min, and after refining, molten steel composition mass percentage is respectively: C:0.05 ~ 0.065%, Si :≤0.03%, Mn:0.25 ~ 0.3%, P :≤0.015%, S :≤0.012%, Als:0.03 ~ 0.06%; Continuous casting of molten steel after refining completes becomes base;
(2), hot rolling: strand heats through process furnace, tapping temperature controls at 1210 ~ 1250 DEG C, remove after scale on surface through scale breaker, enter milling train roughing milling train, start rolling temperature 930 ~ 980 DEG C, after roughing, workpiece thickness controls at 37 ~ 42mm, after enter finish rolling through the roller-way of the stay-warm case that comes into operation, finish rolling start rolling temperature 1030 ~ 1070 DEG C, finishing temperature 880 ~ 900 DEG C, gauge control, at 2.0 ~ 2.5mm, is rolled rear section cooling and is adopted the intensive cooling of leading portion, rate of cooling >=40 DEG C/S, coiling temperature 600 ~ 700 DEG C;
(3), acid is rolled: hot rolling raw material breaks after phosphorus and pickling through straightening, hot rolling raw material is rolled into 0.4 ~ 0.5mm thickness and rolls hard volume, and it is 79 ~ 80% that draft is rolled in acid;
(4), continuous annealing: continuous annealing soaking temperature controls at 535 ~ 545 DEG C, and annealing speed controls at 120 ~ 130m/min, enters zinc pot temperature and controls at 445 ~ 455 DEG C;
(5), pot galvanize: zinc pot temperature controls at 450 ~ 470 DEG C, and zinc liquid composition quality percentage composition is respectively: AL:0.020 ~ 0.022%, Fe :≤0.05%, Pb :≤0.003%, Cu :≤0.002%.
The finishing temperature that strand in step of the present invention (2) after roughing carries out finish rolling is set as 880 ~ 900 DEG C, and finishing temperature easily causes hot roll to consume higher than 900 DEG C to be increased, and the iron scale formed is difficult to remove in rear operation; Finishing temperature easily causes hot-rolled finished product surface mixed crystal lower than 880 DEG C; In step (4), continuous annealing soaking temperature is set as 535 ~ 545 DEG C, annealing soak temperature is lower higher than yield strength qualification rate when 550 DEG C, can only 70% be reached, lower than when 530 DEG C because Thin Specs rapid cooling section temperature drop in stove is excessive, enter zinc pot temperature and do not reach 445 DEG C, cause band steel exceed zinc pot induction heating compensation ability from the heat that zinc pot absorbs and make zinc pot temperature not reach zinc-plated optimum temps.
By the following examples, the invention will be further described;
Embodiment 1: a kind of Thin Specs 600MPa level heat zinc coating plate production method in turn includes the following steps:
By smelt obtain purer molten steel, after become strand through continuous caster continuous casting, its composition by weight percent is: C:0.051%, Si:0.023%, Mn:0.3%, P :≤0.015%, S :≤0.004%, Als:0.035%.
Strand is heated to 1250 DEG C, insulation 250min, the strand after de-scaling carries out 3+3 roughing.Roughing start rolling temperature is 1145 DEG C, and after roughing, workpiece thickness is 39mm, and come into operation stay-warm case, and entry temperature at finishing is 1052 DEG C.Finish rolling finishing temperature 881 DEG C, thickness is 2.28mm, and section cooling mode takes the intensive cooling of leading portion, rate of cooling 42 DEG C/s, coiling temperature 632 DEG C.
2.28mm thickness hot rolling raw material is broken phosphorus through straightening, enters pickling section, straightening unit elongation 2.3%.After overpickling removal scale on surface is thick, enters 5 frame tandem rolling mills coil of strip is rolled into the chill volume of 0.45mm thickness, draft 80% is rolled in acid.
After chill volume cleaning, enter continuous annealing furnace, soaking temperature controls at 535 DEG C, annealing process speed 120m/min, enters zinc pot temperature 446 DEG C, zinc pot temperature 451 DEG C, zinc liquid aluminium content 0.211%.Finished surface quality is good, and mechanical property is in table 1.
Table 1
Embodiment 2: by smelt obtain purer molten steel, after become strand through continuous caster continuous casting, its composition by weight percent is: C:0.065%, Si:0.012%, Mn:0.25%, P :≤0.015%, S :≤0.004%, Als:0.034%.
Strand is heated to 1210 DEG C, insulation 275min, the strand after de-scaling carries out 3+3 roughing.Roughing start rolling temperature is 1052 DEG C, and after roughing, workpiece thickness is 39mm, and come into operation stay-warm case, and entry temperature at finishing is 1046 DEG C.Finish rolling finishing temperature 889 DEG C, thickness is 2.31mm, and section cooling mode takes the intensive cooling of leading portion, rate of cooling 44 DEG C/s, coiling temperature 626 DEG C.
2.31mm thickness hot rolling raw material is broken phosphorus through straightening, enters pickling section, straightening unit elongation 2.3%.After overpickling removal scale on surface is thick, enters 5 frame tandem rolling mills coil of strip is rolled into the chill volume of 0.435mm thickness, draft 81% is rolled in acid.
After chill volume cleaning, enter continuous annealing furnace, soaking temperature controls at 545 DEG C, annealing process speed 130m/min, enters zinc pot temperature 453 DEG C, zinc pot temperature 456 DEG C, zinc liquid aluminium content 0.218%.Finished surface quality is good, and mechanical property is in table 2.
Table 2
Embodiment 3: by smelt obtain purer molten steel, after become strand through continuous caster continuous casting, its composition by weight percent is: C:0.055%, Si:0.013%, Mn:0.21%, P :≤0.015%, S :≤0.004%, Als:0.041%.
Strand is heated to 1238 DEG C, insulation 200min, the strand after de-scaling carries out 3+3 roughing.Roughing start rolling temperature is 1130 DEG C, and after roughing, workpiece thickness is 39mm, and come into operation stay-warm case, and entry temperature at finishing is 1061 DEG C.Finish rolling finishing temperature 890 DEG C, thickness is 2.30mm, and section cooling mode takes the intensive cooling of leading portion, rate of cooling 43 DEG C/s, coiling temperature 627 DEG C.
2.30mm thickness hot rolling raw material is broken phosphorus through straightening, enters pickling section, straightening unit elongation 2.3%.After overpickling removal scale on surface is thick, enters 5 frame tandem rolling mills coil of strip is rolled into the chill volume of 0.45mm thickness, draft 80% is rolled in acid.
After chill volume cleaning, enter continuous annealing furnace, soaking temperature controls at 542 DEG C, annealing process speed 125m/min, enters zinc pot temperature 456 DEG C, zinc pot temperature 456 DEG C, zinc liquid aluminium content 0.225%.Finished surface quality is good, and mechanical property is in table 3.
Table 3
Claims (5)
1. a Thin Specs 600MPa level heat zinc coating plate production method, described heat zinc coating plate thickness specification is 0.4 ~ 0.5mm, comprises following processing step:
(1), steelmaking-refining-continuous casting: through converter decarburization, the refining in ladle refining furnace of the molten steel after dephosphorization, after refining, continuous casting of molten steel becomes base;
(2), hot rolling: strand, through the heating of process furnace steel, is removed after scale on surface through scale breaker, is entered milling train roughing, after enter finish rolling through the roller-way of the stay-warm case that comes into operation, roll rear section cooling and adopt the intensive cooling of leading portion;
(3), acid is rolled: hot rolling raw material breaks through straightening and carries out acid after phosphorus and pickling and roll;
(4), continuous annealing;
(5), pot galvanize;
It is characterized in that: in described step (1), the carbon content control of molten steel after converter decarburization, dephosphorization is at 0.04 ~ 0.055%(mass percent); Refining time is greater than 35min, and the quiet time of blowing is greater than 6min, and after refining, molten steel composition mass percentage is respectively: C:0.05 ~ 0.065%, Si :≤0.03%, Mn:0.25 ~ 0.3%, P :≤0.015%, S :≤0.012%, Als:0.03 ~ 0.06%.
2. a kind of Thin Specs 600MPa level heat zinc coating plate production method as claimed in claim 1, it is characterized in that: in described step (2), strand tapping temperature controls at 1210 ~ 1250 DEG C, remove after scale on surface through scale breaker, enter milling train roughing milling train, start rolling temperature 1050 ~ 1150 DEG C, after roughing, workpiece thickness controls at 37 ~ 42mm, after enter finish rolling through the roller-way of the stay-warm case that comes into operation, finish rolling start rolling temperature 1030 ~ 1070 DEG C, finishing temperature 880 ~ 900 DEG C, gauge control is at 2.0 ~ 2.5mm, roll rear section cooling and adopt the intensive cooling of leading portion, rate of cooling >=40 DEG C/S, coiling temperature 600 ~ 700 DEG C.
3. a kind of Thin Specs 600MPa level heat zinc coating plate production method as claimed in claim 1 or 2, it is characterized in that: in described step (3), hot rolling raw material breaks after phosphorus and pickling through straightening, hot rolling raw material is rolled into 0.4 ~ 0.5mm thickness and rolls hard volume, it is 79 ~ 80% that draft is rolled in acid.
4. a kind of Thin Specs 600MPa level heat zinc coating plate production method as claimed in claim 1 or 2, it is characterized in that: in described step (4), continuous annealing soaking temperature controls at 535 ~ 545 DEG C, annealing speed controls at 120 ~ 130m/min, enters zinc pot temperature and controls at 445 ~ 455 DEG C.
5. a kind of Thin Specs 600MPa level heat zinc coating plate production method as claimed in claim 1 or 2, it is characterized in that: in described step (5), zinc pot temperature controls at 450 ~ 470 DEG C, zinc liquid composition quality percentage composition is respectively: AL:0.020 ~ 0.022%, Fe :≤0.05%, Pb :≤0.003%, Cu :≤0.002%.
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| CN105088064A (en) * | 2015-08-31 | 2015-11-25 | 武汉钢铁(集团)公司 | Cladding layer steel for 340 MPa grade automobile large beams and production method |
| CN107201437A (en) * | 2017-05-08 | 2017-09-26 | 武汉钢铁有限公司 | A kind of process for producing Thin Specs high-carbon steel |
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| CN107419078A (en) * | 2016-05-23 | 2017-12-01 | 上海梅山钢铁股份有限公司 | Yield strength 345MPa level low cost hot rolled steel plates and its manufacture method |
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| CN108588573A (en) * | 2018-04-28 | 2018-09-28 | 江苏恒加机械工程有限公司 | A kind of production technology of metallic support |
| CN110170528A (en) * | 2019-04-24 | 2019-08-27 | 邯郸钢铁集团有限责任公司 | A kind of cold-rolled low carbon steel white patches on surface defects controlling method |
| CN111254374A (en) * | 2020-03-31 | 2020-06-09 | 日照钢铁控股集团有限公司 | Zinc-flower-free hot-dip galvanized sheet process |
| CN111438189A (en) * | 2020-04-09 | 2020-07-24 | 北京首钢股份有限公司 | Cold-rolled sheet and shape control method thereof |
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| CN115216607B (en) * | 2022-06-30 | 2023-11-10 | 武汉钢铁有限公司 | Control method for alloying speck defect of hot dip galvanized iron alloy outer plate |
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