CN103103538A - Production method of hot dipped steel coil - Google Patents
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- CN103103538A CN103103538A CN2011103551657A CN201110355165A CN103103538A CN 103103538 A CN103103538 A CN 103103538A CN 2011103551657 A CN2011103551657 A CN 2011103551657A CN 201110355165 A CN201110355165 A CN 201110355165A CN 103103538 A CN103103538 A CN 103103538A
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Abstract
The invention provides a production method of a hot dipped steel coil. The method comprises steps of hot rolling, cold rolling, annealing, galvanizing and straightening on a billet. The batching temperature of the hot rolling is 500-550 DEG C; and the billet contains, calculated by a total weight of the billet, 0.04-0.1 wt% of carbon, 0.2-0.5 wt% of manganese, 0.06-0.09 wt% of phosphorus and 0.015-0.03 wt% of niobium. The method provided by the invention can obtain structural hot dipped steel coil with high width precision, and yield strength level of grade 350M Pa.
Description
Technical field
The present invention relates to a kind of production method of hot dip coil of strip.
Background technology
Coated Steel is divided into structure Coated Steel and punching press Coated Steel.Described structure Coated Steel requires to guarantee certain intensity and plasticity, and lower yield tensile ratio is to improve anti-seismic performance.The structure Coated Steel is the main raw material that coating product for building and structure are used colour coated plate, and its yield strength rank has 280MPa, 320MPa and 350MPa etc.In order to satisfy the demand of following process, the structure Coated Steel is generally by web-like delivery, and width accuracy is had higher requirement, and the hot-dip steel plate take width as 1250mm is example, the high class precision permissible variation of width is 0-2mm, and general precision permissible variation is 0-6mm; The user of the developed width of the width accuracy=hot dip coil of strip-hot dip coil of strip width of ordering goods.
Traditional structure adopts structural carbon steel to produce with the hot dip coil of strip, and its typical composition (weight percent) is: C :≤0.20%, Si :≤0.60%, Mn :≤1.70%, P :≤0.10%, S :≤0.045%.For 350MPa level hot dip coil of strip, because carbon and manganese content is higher, the cold rolling load is higher, for rolling power lower continuous mill and reversable mill, have larger spreading when cold rolling, but because there are differences on hot rolling stock roll specification and mechanical property, also there is larger difference in cold rolling absolute spread; In addition, in order to guarantee the mechanical property of pot galvanize volume, when continuous hot galvanizing, need to carry out continuous annealing more than recrystallization temperature, because of its hot strength lower, affected by the factor such as unit tension force, the band steel can be by drawing down, and the drawing down amount is subject to the impact with factors such as steel material condition, specification and hot dip galvanizing process conditions.Therefore, usually, the method for control texture hot-dip steel plate width accuracy mainly contains following two kinds: the first, by cold rolling absolute spread and the quantitative statistics of pot galvanize drawing down are analyzed, then according to user's width requirement, determine suitable hot rolling raw material width.But, more complicated with the influence factor of steel drawing down amount during due to the cold rolling absolute spread of traditional structural carbon steel and hot dip, therefore, during production, its value is unstable, finally be difficult to its width difference is controlled in the scope of customer requirements, particularly in the permissible variation scope of high class precision.The second, by cold rolling absolute spread and the quantitative statistics of pot galvanize drawing down are analyzed, then according to user's width requirement, determine enough hot rolling raw material width, yet guarantee that by trimming width with steel is in user's claimed range again.But, after adopting this method need to be equipped with online trimming equipment or hot dip coil of strip to roll off the production line, carry out trimming to finishing line, thereby increased production cost.Therefore, in order to satisfy the user to the width accuracy requirement of high-strength structure with the hot dip coil of strip, need a kind of manufacturing process cheaply of exploitation to implement difficulty little, width accuracy, surface quality and high comprehensive performance can be in the production methods of the 350MPa grade high-strength structure hot dip coil of strip of Continuous Hot Dip Galvanizing canbe used on line batch production.
Summary of the invention
To the objective of the invention is the lower defective of width accuracy that adopts the hot dip coil of strip that existing method obtains in order overcoming, and a kind of production method that can access the higher hot dip coil of strip of width accuracy to be provided.
The invention provides a kind of production method of hot dip coil of strip, the method comprises carries out hot rolling, cold rolling, annealing, zinc-plated and straightening successively with strand, and wherein, the coiling temperature of described hot rolling is 500-550 ℃, contains carbon, manganese, phosphorus and niobium in described strand; Take the total mass of described strand as benchmark, the content of described carbon is the 0.04-0.1 % by weight, and the content of described manganese is the 0.2-0.5 % by weight, and the content of described phosphorus is the 0.06-0.09 % by weight, and the content of described niobium is the 0.015-0.03 % by weight.
The present inventor finds, the content of carbon in strand is controlled at the 0.04-0.1 % by weight, the content of manganese is controlled at the 0.2-0.5 % by weight, the content of phosphorus is controlled at the 0.06-0.09 % by weight, the content of niobium is controlled at the 0.015-0.03 % by weight, can guarantee that the rolling load of described hot dip coil of strip when cold rolling is lower, not be prone to after cold rolling and spread.As a rule, for intensity and the plasticity that guarantees the hot dip coil of strip, before zinc-plated, need to anneal more than recrystallization temperature, but because the hot strength with steel that obtains after cold rolling is lower, very easily by drawing down.In the production process of hot dip steel, the niobium that contains in described strand (Nb) can be converted into Nb (CN) precipitated phase with strengthening effect; Described Nb (CN) precipitated phase can be separated out in hot rolling reeling, also can separate out when annealing.And the coiling temperature of hot rolling is controlled at 500-550 ℃, but the grain-size of refinement hot rolled coil not only, separate out in hot rolling reeling but also can effectively suppress Nb (CN) precipitated phase, and guarantee that it the time separates out in annealing, make described high-temperature yield strength with steel be improved, be difficult for deforming when hot dip, thereby obtain the higher hot dip coil of strip of width accuracy.A preferred embodiment of the invention, Mild Carbon Steel Strip after finish rolling is cooled to 600-650 ℃ with the speed of cooling of 100-200 ℃/s, be cooled to again the coiling temperature of hot rolling with the speed of cooling of 10-20 ℃/s, can prevent from better being with steel to deform when hot dip, the width accuracy of the hot dip coil of strip that obtains be higher.According to another kind of preferred implementation of the present invention, when the temperature of described annealing is 730-760 ℃, the time of annealing can effectively guarantee to be with steel to carry out recrystallize when being 30-60s; Under the prerequisite of separating out when controlling Nb (CN) precipitated phase in annealing, not only width accuracy is higher for gained hot dip coil of strip, intensity and plasticity also higher.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only is used for description and interpretation the present invention, is not limited to the present invention.
According to the present invention, the production method of described hot dip coil of strip comprises carries out hot rolling, cold rolling, annealing, zinc-plated and straightening successively with strand, and wherein, the coiling temperature of described hot rolling is 500-550 ℃, contains carbon, manganese, phosphorus and niobium in described strand; Take the total mass of described strand as benchmark, the content of described carbon is the 0.04-0.1 % by weight, and the content of described manganese is the 0.2-0.5 % by weight, and the content of described phosphorus is the 0.06-0.09 % by weight, and the content of described niobium is the 0.015-0.03 % by weight.
According to the present invention, under preferable case, except above material, can also contain silicon, sulphur and aluminium in described strand; And take the total mass of described structural carbon steel strand as benchmark, the content of described silicon≤0.05 % by weight, the content of described sulphur≤0.015 % by weight, the content of described aluminium is the 0.02-0.07 % by weight.
According to the present invention, the preparation method of described strand can adopt the method for this area routine, as long as preferably make in strand of the present invention, take the total mass of described strand as benchmark, the content of described carbon is the 0.04-0.1 % by weight, the content of described manganese is the 0.2-0.5 % by weight, the content of described phosphorus is the 0.06-0.09 % by weight, the content of described niobium is the 0.015-0.03 % by weight, the content of described silicon≤0.05 % by weight, the content of described sulphur≤0.015 % by weight, the content of described aluminium are that the 0.02-0.07 % by weight gets final product.As a rule, the preparation method of described strand comprises: molten iron is carried out just refining, obtain molten steel, and will just refine the molten steel that obtains and tap in ladle; In tapping process, molten steel is carried out pre-deoxidation alloying and carburetting; After tapping, the molten steel in ladle is carried out ladle furnace refining, described ladle furnace refining generally includes LF stove refining temperature adjustment processing and vacuum refinement, with the inclusion in further removal molten steel and carry out alloy fine setting, then the molten steel after refining is injected tundish, and be poured into continuously crystallizer to be pulled continuously with cooling from tundish, namely continuous casting obtains strand.Wherein, in described pre-deoxidation alloying and carburetting step, make the component in molten steel preferably satisfy requirement of the present invention by the add-on of controlling the alloys such as carburelant and manganeseirom, ferrocolumbium, ferroaluminium, for example, under preferable case, the molten steel that obtains take just refining per ton is as benchmark, the consumption of carburelant is the 0.15-0.8 kilogram, the consumption of manganeseirom is the 5-7.5 kilogram, the consumption of ferrorphosphorus is the 3-4.5 kilogram, the consumption of ferrocolumbium is the 0.25-0.5 kilogram, and the consumption of ferroaluminium is the 3-5 kilogram; And control the content of inclusion content in melting steel by slag supplying agent, to control the content of silicon and sulphur in molten steel.
According to the present invention, described hot rolling refers to strand is rolled after heating, then the band steel after rolling is batched.As a rule, described hot rolling comprises soaking, roughing and finish rolling; The temperature of described soaking, roughing and finish rolling is known to the skilled person, and under preferable case, the temperature of described soaking is 1200-1250 ℃; The finishing temperature of described roughing is 1000-1100 ℃; The finishing temperature of described finish rolling is 880-920 ℃, carries out finish to gauge under said temperature, obtain tiny uniform tissue thereby not only can guarantee to be rolled in the austenitic area, and Surfaces of Hot Rolled Strip is not prone to the iron sheet defective, quality is better.
Under preferable case, the method of described production hot dip coil of strip also comprises the band steel after finish rolling is cooled to 600-650 ℃ with the speed of cooling of 100-200 ℃/s immediately, be cooled to again the coiling temperature of hot rolling with the speed of cooling of 10-20 ℃/s, coiling temperature requires to be controlled at 500-550 ℃, separates out in hot rolled coil to suppress Nb (CN) precipitated phase.
According to the present invention, described cold rolling referring to being rolled at the temperature lower than its recrystallization temperature with steel of obtaining after hot rolling.The present invention is not particularly limited cold rolling condition, for conventionally known to one of skill in the art.Described cold rolling draft can be 50-75%, is preferably 65-70%; Described cold rolling draft=with the change value of thickness of steel/with the original depth of steel * 100%.
According to the present invention, under preferable case, the method for described hot dip coil of strip also comprises cooling rear, the cold rolling front pickling of hot rolling, and the purpose of described pickling is to eliminate the impurity such as oxide compound of Surfaces of Hot Rolled Strip, improves the surface quality of cold-reduced sheet.The technology and condition of described pickling is known to the skilled person, and for example, can use the hydrochloric acid of 1.6-2.7 mol/L that hot rolled strip is cleaned.The production of associating unit is rolled in described pickling and cold rolling preferred employing acid, to enhance productivity and lumber recovery.According to the process characteristic of unit, guarantee pickling effect by adjusting unit speed during acid Xian.
According to the present invention, more than described annealing refers to the band steel is heated to recrystallization temperature, keep enough time, then with the cooling a kind of thermal treatment process of Reasonable Speed, its objective is to make through rolling band steel and soften, improve plasticity and toughness, remove unrelieved stress, or the physicals that obtains expecting.The method according to this invention, under the condition that guarantees perfect recrystallization, anneal at lesser temps as far as possible, on the one hand prevent from being with steel under the tension force effect by drawing down, the intensity of the hot dip coil of strip that obtains with raising on the other hand and the cooperation of plasticity, under preferable case, the temperature of described annealing is 730-760 ℃, and the time of annealing is 30-60s.
According to the present invention, described zinc-plated referring at the process for treating surface with effects such as plated surface one deck zinc alloy of steel are attractive in appearance to play, antirust.The method that the present invention adopts is pot galvanize, even the aluminium zinc of melting contacts and forms the aluminium zinc layer at belt steel surface with the band steel matrix, thereby band steel matrix and coating is both combined.This clearly demarcated galvanizing flux and hot galvanizing method that adopts routine, during pot galvanize, zinc pot temperature is controlled to be 455-465 ℃; Take the gross weight of galvanizing flux as benchmark, wherein, the content of aluminium can be the 0.16-0.2 % by weight, and the content of zinc can be the 99.8-99.84 % by weight.Described zinc-plated condition is known to the skilled person, as long as can make the hot dip coil of strip with respect to every square metre, the amount of zinc coating is preferably the 250-300 gram and gets final product.
Generally, described annealing, pot galvanize are all carried out in Continuous Hot Dip Galvanizing, and the pot galvanize unit is that annealing and pot galvanize are joined together to carry out.When adopting annealing and pot galvanize associating line to produce, first will be with the steel direct heating to 650-680 ℃ with gas flame, the ROLLING OIL that belt steel surface is remaining will be burnt, purify the surface; Then will be with steel to be heated to 730-760 ℃ in total radiation process furnace (RTH stove) and complete recrystallization annealing; At last, with after annealing be cooled to 455-465 ℃ with steel after in the situation that not ingress of air to enter the zinc pot zinc-plated.Perhaps, the band steel can also be carried out electrolytic degreasing; Then will be with steel to be heated to 730-760 ℃ in total radiation process furnace (RTH stove) and complete recrystallization annealing; At last, with after annealing be cooled to 455-465 ℃ with steel after in the situation that not ingress of air to enter the zinc pot zinc-plated.
Wherein, describedly will can be the method for cooling of this area routine with the cooling method of steel, for example can be with the cooling gas that flows, as jet cooling with blower fan.Cooling gas used can be usually used in jet cooling gas for this area, for example, can be the mixed gas of nitrogen and hydrogen, and wherein the volume percent of hydrogen can be 2-8%, is preferably 3-7%, and more preferably 5%.The present invention is not particularly limited the temperature of jet cooling time, jet amount and cooling gas, is 455-465 ℃ as long as make with the temperature of steel before entering the zinc pot.More stable in order to make with the mechanical property of steel, under preferable case, the speed of cooling that is cooled to zinc-plated temperature by annealing temperature is 10-15 ℃/second.
According to the present invention, described straightening is to instigate the alternating bending and apply pulling force on the minor diameter roller of band steel, makes the band steel produce elastoplasticity and extends, thereby will be with steel to align.The method according to this invention in order to reduce the yield strength with steel, also need will be carried out straightening after zinc-plated on the stretching straightener of hot galvanizing line with steel, the unit elongation that makes straightening is 0.2-0.6%.
After method of the present invention can also be included in straightening, carry out surface passivating treatment, and the coil of strip that strip coiling is become certainweight.
Below, by embodiment, the present invention is described in more detail.
Embodiment 1
The present embodiment is used for illustrating the method for production hot dip coil of strip provided by the invention.
With strand (composition: take the gross weight of strand as benchmark, C:0.04 % by weight, Si:0.01 % by weight, Mn:0.21 % by weight, P:0.06 % by weight, S:0.011 % by weight, Nb:0.015 % by weight, Al:0.07 % by weight, surplus is iron) after 1200 ℃ of soaking, become the thick intermediate blank of 30mm with the roughing mill roughing, the finishing temperature of roughing is 1050 ℃; Then use the hot rolled strip of the rolling 4mm of finishing mill, the finishing temperature of finish rolling is 880 ℃; Speed with 200 ℃/s after finish rolling is cooled to 600 ℃, then is cooled to 500 ℃ with the speed of 10 ℃/s, and enters reeling machine and batch rolling.Use the circle shear trimming after being with steel to be cooled to room temperature (25 ℃), width is controlled at 1002mm, the hydrochloric acid that is 170g/L with concentration carries out pickling, then at the upper cold-reduced sheet that rolls into 1mm with 75% draft of cold continuous rolling associating unit (CDCM unit).Adopt total radiation pipe pot galvanize unit (middle smelting CCID) to anneal and zinc-plated.Cold-rolled steel sheet is welded into the band steel from beginning to end, is 100m/min with steel in the transfer rate of process section, and annealing temperature is 745 ℃, and the annealing soaking time is 40 seconds.Then with blower fan, this is sprayed wind with steel cooling until reduce to 460 ℃ with the temperature of steel, speed of cooling is 13.3 ℃/second, and cooling gas used is N
2And H
2Mixed gas, H wherein
2Account for 5% of volume of gas.Then, should be with steel to be sent to carry out in the zinc pot zinc-plated, in the galvanizing flux in the zinc pot, the content of aluminium is 0.2 % by weight, and the content of zinc is 99.8 % by weight, and the temperature of zinc pot is 460 ℃, and the zinc-plated time is 4 seconds.Obtain thickness and be the hot-dip steel plate of 1 millimeter, the weight of described zinc coating (two-sided) is 275 g/ms.Then the band steel with cool to room temperature carries out straightening, and the straightening unit elongation is 0.21%, and the band steel after straightening is advanced the reeling machine rolling, obtains hot dip coil of strip X1.
Embodiment 2
The present embodiment is used for illustrating the method for production hot dip coil of strip provided by the invention.
With strand (composition: take the gross weight of strand as benchmark, C:0.1 % by weight, Si:0.02 % by weight, Mn:0.5 % by weight, P:0.09 % by weight, S:0.011 % by weight, Nb:0.03 % by weight, Al:0.02 % by weight, surplus is iron) after 1250 ℃ of soaking, become the thick intermediate blank of 32mm with the roughing mill roughing, the finishing temperature of roughing is 1100 ℃; Then use the hot rolled strip of the rolling 3mm of finishing mill, the finishing temperature of finish rolling is 920 ℃; Speed with 100 ℃/s after finish rolling is cooled to 650 ℃, then is cooled to 550 ℃ with the speed of 20 ℃/s, and enters reeling machine and batch rolling.Use the circle shear trimming after being with steel to be cooled to room temperature (25 ℃), width is controlled at 1252mm, the hydrochloric acid that is 170g/L with concentration carries out pickling, then rolls into the cold-reduced sheet of 1.5mm on the six cold rolling units of roller UCM single stand reversible with 50% draft.Adopt total radiation pipe pot galvanize unit (middle smelting CCID) to anneal and zinc-plated.Cold-rolled steel sheet is welded into the band steel from beginning to end, is 80m/min with steel in the transfer rate of process section, and annealing temperature is 730 ℃, and the annealing soaking time is 50 seconds.Then with blower fan, this is sprayed wind with steel cooling until reduce to 455 ℃ with the temperature of steel, speed of cooling is 15 ℃/second, and cooling gas used is N
2And H
2Mixed gas, H wherein
2Account for 5% of volume of gas.Then, should be with steel to be sent to carry out in the zinc pot zinc-plated, in the galvanizing flux in the zinc pot, the content of aluminium is 0.2 % by weight, and the content of zinc is 99.8 % by weight, and the temperature of zinc pot is 455 ℃, and the zinc-plated time is 5 seconds.Obtain thickness and be the hot-dip steel plate of 1.5 millimeters, the weight of described zinc coating (two-sided) is 250 g/ms.Then the band steel with cool to room temperature carries out straightening, and the straightening unit elongation is 0.6%, and the band steel after straightening is advanced the reeling machine rolling, obtains hot dip coil of strip X2.
Embodiment 3
The present embodiment is used for illustrating the method for production hot dip coil of strip provided by the invention.
With strand (composition: take the gross weight of strand as benchmark, C:0.06 % by weight, Si:0.01 % by weight, Mn:0.35 % by weight, P:0.07 % by weight, S:0.011 % by weight, Nb:0.021 % by weight, Al:0.05 % by weight, surplus is iron) after 1230 ℃ of soaking, become the thick intermediate blank of 32mm with the roughing mill roughing, the finishing temperature of roughing is 1080 ℃; Then use the hot rolled strip of the rolling 3mm of finishing mill, the finishing temperature of finish rolling is 900 ℃; Speed with 150 ℃/s after finish rolling is cooled to 620 ℃, then is cooled to 530 ℃ with the speed of 15 ℃/s, and enters reeling machine and batch rolling.Use the circle shear trimming after being with steel to be cooled to room temperature (25 ℃), width is controlled at 1202mm, the hydrochloric acid that is 170g/L with concentration carries out pickling, then rolls into the cold-reduced sheet of 1.2mm on the six cold rolling units of roller UCM single stand reversible with 60% draft.Adopt total radiation pipe pot galvanize unit (middle smelting CCID) to anneal and zinc-plated.Cold-rolled steel sheet is welded into the band steel from beginning to end, is 100m/min with steel in the transfer rate of process section, and annealing temperature is 760 ℃, and the annealing soaking time is 40 seconds.Then with blower fan, this is sprayed wind with steel cooling until reduce to 465 ℃ with the temperature of steel, speed of cooling is 10 ℃/second, and cooling gas used is N
2And H
2Mixed gas, H wherein
2Account for 5% of volume of gas.Then, should be with steel to be sent to carry out in the zinc pot zinc-plated, in the galvanizing flux in the zinc pot, the content of aluminium is 0.2 % by weight, and the content of zinc is 99.8 % by weight, and the temperature of zinc pot is 465 ℃, and the zinc-plated time is 4 seconds.Obtain thickness and be the hot-dip steel plate of 1.2 millimeters, the weight of described zinc coating (two-sided) is 300 g/ms.Then the band steel with cool to room temperature carries out straightening, and the straightening unit elongation is 0.4%, and the band steel after straightening is advanced the reeling machine rolling, obtains hot dip coil of strip X3.
Embodiment 4
The present embodiment is used for illustrating the method for production hot dip coil of strip provided by the invention.
According to the method production hot dip coil of strip of embodiment 1, different is that described annealing temperature is 780 ℃, obtains hot dip coil of strip X4.
Comparative Examples 1
This Comparative Examples is used for the method for the production hot dip coil of strip of explanation reference.
With strand (composition: take the gross weight of strand as benchmark, C:0.16 % by weight, Si:0.01 % by weight, Mn:1.31 % by weight, P:0.015 % by weight, S:0.011 % by weight, Al:0.07 % by weight, surplus is iron) after 1200 ℃ of soaking, become the thick intermediate blank of 30mm in the roughing mill roughing, the roughing finishing temperature is 1050 ℃, then at the hot rolled strip of the rolling 3mm of finishing mill, finishing temperature is 880 ℃, speed with 40 ℃/s after finish rolling is cooled to 700 ℃, speed with 10 ℃/s is cooled to 650 ℃ again, and enters reeling machine and batch rolling.Use the circle shear trimming after being with steel to be cooled to room temperature (25 ℃), width is controlled at 1002mm, the hydrochloric acid that is 170g/L with concentration carries out pickling, then at the upper cold-reduced sheet that rolls into 1.0mm with 66.7% draft of cold continuous rolling associating unit (CDCM unit).Adopt total radiation pipe pot galvanize unit (middle smelting CCID) to anneal and zinc-plated.Cold-rolled steel sheet is welded into the band steel from beginning to end, is 100m/min with steel in the transfer rate of process section, and annealing temperature is 800 ℃, and the annealing soaking time is 40 seconds.Then with blower fan, this is sprayed wind with steel cooling until reduce to 460 ℃ with the temperature of steel, speed of cooling is 13.3 ℃/second, and cooling gas used is N
2And H
2Mixed gas, H wherein
2Account for 5% of volume of gas.Then, should be with steel to be sent to carry out in the zinc pot zinc-plated, in the galvanizing flux in the zinc pot, the content of aluminium is 0.2 % by weight, and the content of zinc is 99.8 % by weight, and the temperature of zinc pot is 460 ℃, and the zinc-plated time is 4 seconds.Obtain thickness and be the structural carbon steel hot-dip steel plate of 1.0 millimeters, the weight of described zinc coating (two-sided) is 275 g/ms.Then the band steel with cool to room temperature carries out straightening, and the straightening unit elongation is 0.21%, and the band steel after straightening is advanced the reeling machine rolling, obtains hot dip steel D1.
Comparative Examples 2
This Comparative Examples is used for the method for the production hot dip coil of strip of explanation reference.
Method production hot dip coil of strip according to Comparative Examples 1, noly be, the composition of described strand is as follows: take the gross weight of strand as benchmark, C:0.20 % by weight, Si:0.01 % by weight, Mn:1.50 % by weight, P:0.012 % by weight, S:0.015 % by weight, Al:0.05 % by weight, surplus is iron, obtains hot dip steel D2.
Test case 1-4
Test case 1-4 is used for illustrating hot dip coil of strip performance test provided by the invention.
(1) test of mechanical property:
Method according to the GB/T228.1-2010 regulation is carried out yield strength (R to the hot dip coil of strip of embodiment 1-4 gained respectively
eH), tensile strength (R
m) and elongation after fracture (A
80) test, the result of gained is as shown in table 1.
(2) test of width accuracy deviation:
By the width self-operated measuring unit, the width of coil of strip is carried out on-line testing at the galvanization production line outlet section, acquired results is as shown in table 1.
Contrast test example 1-2
Contrast test example 1-2 is used for explanation reference hot dip coil of strip performance test.
Method according to test case 1-4 is tested the performance of hot dip coil of strip, and different is, described hot dip coil of strip is the hot dip coil of strip that is obtained by Comparative Examples 1-2 production, and acquired results is as shown in table 1.
Table 1
| Numbering | R eH(MPa) | R m(MPa) | A 80(％) | Width accuracy deviation (mm) |
| Embodiment 1 | 425 | 465 | 35 | +2 |
| Embodiment 2 | 460 | 505 | 28 | +2 |
| Embodiment 3 | 440 | 485 | 31 | +2 |
| Embodiment 4 | 350 | 420 | 37 | +0.5 |
| Comparative Examples 1 | 380 | 500 | 27 | +4 |
| Comparative Examples 2 | 340 | 465 | 30 | +7 |
Annotate: (1) R
eH-yield strength; R
m-tensile strength; A
80-elongation after fracture;
(2) in the GB/T2518-2008 standard, the 350MPa level structure with the mechanical property requirements of hot dip coil of strip is: R
P0.2(or R
eH) 〉=350MPa, R
m〉=420Mpa, A
80〉=16%.
As can be known from the results of Table 1, adopt the mechanical property of the hot dip coil of strip that method of the present invention obtains to satisfy the 350MPa level structure with the requirement of hot dip coil of strip, and width accuracy is higher.
Claims (10)
1. the production method of a hot dip coil of strip, the method comprise carries out hot rolling, cold rolling, annealing, zinc-plated and straightening successively with strand, it is characterized in that, the coiling temperature of described hot rolling is 500-550 ℃, contains carbon, manganese, phosphorus and niobium in described strand; Take the total mass of described strand as benchmark, the content of described carbon is the 0.04-0.1 % by weight, and the content of described manganese is the 0.2-0.5 % by weight, and the content of described phosphorus is the 0.06-0.09 % by weight, and the content of described niobium is the 0.015-0.03 % by weight.
2. method according to claim 1, wherein, also contain silicon, sulphur and aluminium in described strand; Take the total mass of described strand as benchmark, the content of described silicon≤0.05 % by weight, the content of described sulphur≤0.015 % by weight, the content of described aluminium is the 0.02-0.07 % by weight.
3. method according to claim 1, wherein, described hot rolling comprises soaking, roughing and finish rolling, and the temperature of described soaking is 1200-1250 ℃, and the finishing temperature of described roughing is 1000-1100 ℃, and the finishing temperature of described finish rolling is 880-920 ℃; And the Mild Carbon Steel Strip after finish rolling is cooled to 600-650 ℃ with the speed of cooling of 100-200 ℃/s, then be cooled to the coiling temperature of hot rolling with the speed of cooling of 10-20 ℃/s.
4. method according to claim 1, wherein, described cold rolling draft is 50-75%.
5. method according to claim 1, wherein, the temperature of described annealing is 730-760 ℃, the time of annealing is 30-60s.
6. method according to claim 1, wherein, described zinc-plated temperature is 455-465 ℃.
7. according to claim 1,5 or 6 described methods, wherein, the speed of cooling that is cooled to zinc-plated temperature by annealing temperature is 10-15 ℃/second.
8. according to claim 1 or 6 described methods, wherein, described zinc-plated condition makes the hot dip coil of strip with respect to every square metre, and the amount of zinc coating is the 250-300 gram.
9. method according to claim 1, wherein, the method also be included in cold rolling before, Mild Carbon Steel Strip is carried out pickling.
10. method according to claim 1, wherein, the unit elongation of described straightening is 0.2-0.6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110355165.7A CN103103538B (en) | 2011-11-10 | 2011-11-10 | Production method of hot dipped steel coil |
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| CN103938093A (en) * | 2014-04-21 | 2014-07-23 | 武汉钢铁(集团)公司 | Coated and plated bundling belt with thickness of 0.3mm and production method thereof |
| CN105274301A (en) * | 2015-11-11 | 2016-01-27 | 武汉钢铁(集团)公司 | Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa |
| CN107760999A (en) * | 2017-10-23 | 2018-03-06 | 攀钢集团攀枝花钢铁研究院有限公司 | 550Mpa level structure hot-dip aluminizing zincium steel plates and preparation method thereof |
| CN112742897A (en) * | 2020-12-22 | 2021-05-04 | 安徽天鸿新型钢结构材料有限公司 | Preparation method of corrosion-resistant steel coil |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938093A (en) * | 2014-04-21 | 2014-07-23 | 武汉钢铁(集团)公司 | Coated and plated bundling belt with thickness of 0.3mm and production method thereof |
| CN103938093B (en) * | 2014-04-21 | 2016-06-29 | 武汉钢铁(集团)公司 | A kind of thickness is coating tie and the production method thereof of 0.3 mm |
| CN105274301A (en) * | 2015-11-11 | 2016-01-27 | 武汉钢铁(集团)公司 | Method for producing iron-zinc alloy coated steel plate with yield strength being equal to or higher than 220 MPa |
| CN107760999A (en) * | 2017-10-23 | 2018-03-06 | 攀钢集团攀枝花钢铁研究院有限公司 | 550Mpa level structure hot-dip aluminizing zincium steel plates and preparation method thereof |
| CN112742897A (en) * | 2020-12-22 | 2021-05-04 | 安徽天鸿新型钢结构材料有限公司 | Preparation method of corrosion-resistant steel coil |
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| CN103103538B (en) | 2014-10-29 |
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