CN105088064A - Cladding layer steel for 340 MPa grade automobile large beams and production method - Google Patents
Cladding layer steel for 340 MPa grade automobile large beams and production method Download PDFInfo
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Abstract
Cladding layer steel for 340 MPa grade automobile large beams comprises the chemical components including, by weight, 0.06-0.09% of C, 0.023% or less of Si, 0.30-0.50% of Mn, 0.015% or less of P, 0.008% or less of S and 0.020-0.060% of Als. According to production steps, the product enters an argon station to be subjected to argon blowing after being smelted by a converter; after tapping and continuous casting blank forming, cast blanks are heated; segmented hot rolling is performed; laminar cooling is performed in a variable-speed cooling manner; reeling is performed; and finishing and later procedures are performed. Under design of low alloy components, variable-speed cooling and segmented cooling are adopted, the produced large beam steel for cladding layers has good dent resistance on the premise that the mechanical property of a steel plate is guaranteed, hot galvanizing production can be directly performed, and the requirements for the high surface quality and load bearing performance of the automobile large beams and other parts are met.
Description
Technical field
The present invention relates to a kind of automobile steel and production method, belong to a kind of 340MPa level automotive frame coated steel and production method particularly.
Background technology
Coating hot-rolled steel is used widely at the automotive frame higher for surface quality requirements.Hot-dip galvanizing sheet steel surface has coating light, uniform color, good weather resistance and the feature of aesthetic property; Meanwhile, the parts such as automotive frame also require that steel have good dent resistance, and should have high-yield-ratio.
At present, with regard to its beam steel still at rank steel grades such as Q345, Q235, then at this type of steel grade surface heat zinc coating.Due to the development of automotive industry, it can not meet and has manufactured high-strength vehicle structural part and the zinc-plated requirement of surface heat thereof.For this reason, steel industry manufacturer is all actively developing research and the development of the parties concerned.
In prior art, cooling for steel plate all adopts a lower or conventional stable speed of cooling to be cooled to the temperature required, through a large amount of analysis and research of the applicant, adopt the steel plate that this type of cooling is produced, for reaching intensity and the tissue of regulation, often need to add more alloying element, production cost is higher.
Through preliminary search, Chinese Patent Application No. is the document of CN201310064053.5, disclose the zinc-plated High Strength Construction Steel of more than a kind of 400MPa level, its component and content are: C:0.06-0.10%, Mn:0.4-1.0%, Si:0.10-0.30%, P≤0.015%, S≤0.015%, Als:0.02-0.05%, Nb:0.01-0.05%, surplus is Fe.Although the document reaching by adopting the Nb element adding trace the object improving intensity, thus reduces the add-on of C, Si, Mn element, improve welding property, improving the fragility of steel, improve extension property.But it exists: one be due to its using Si as effective element, and content is high, and this can make steel billet in heat-processed, easily produce the oxide compound of a large amount of Si, and has a strong impact on plate surface quality.Si content height simultaneously in steel also can when subsequent thermal be zinc-plated, generate loose ζ alloy phase, cause coating to occur loss of adhesion problem, make zinc-plated after surface quality worsen further, and cause qualification rate to decline, more mainly can not meet the requirements at the higher level of automobile production manufacturer.On the other hand, its cooling stages adopt be first slow cooling after be cooled to design temperature the speed of cooling of 10 ~ 30 DEG C/sec, easily cause steel tissue distribution uneven, thus affect the stability of plate property.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, there is provided a kind of at guarantee yield strength >=340MPa, tensile strength 420-540MPa, unit elongation can reach A >=25%, 180 ° of transverse bending test D=0.5a are qualified, under yield tensile ratio reaches the prerequisite of 0.85, roll rear supper-fast sub-sectional cooling technique, though be extremely low alloying constituent by adopting, but coating adhesion is further enhanced, the 340MPa level automotive frame coated steel that the plate surface quality after zinc-plated is more excellent and production method.
Realize the measure of above-mentioned purpose:
A kind of 340MPa level automotive frame coated steel, its chemical composition and weight percent content are: C:0.06 ~ 0.09%, Si≤0.023%, Mn:0.30 ~ 0.50%, P≤0.015%, S≤0.008%, Als:0.020 ~ 0.060%, surplus is Fe and inevitable impurity.
Preferably: the weight percent content of Si is no more than 0.02%.
Produce a kind of method of 340MPa level automotive frame coated steel, its step:
1) after converter smelting, enter argon station Argon, and routine adds aluminum steel deoxidation and composition adjustment; Control argon blowing time: bottom blowing is not less than 4min, and top blast is not less than 5min;
2) through tapping and continuous casting becomes to strand heating after base, its heating and temperature control at 1200 ~ 1250 DEG C, heat-up time 30 ~ 40min;
3) carry out segmentation hot rolling, and control roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature at 850 ~ 890 DEG C;
4) adopt the speed change degree type of cooling to carry out section cooling, that is: first under speed of cooling is 60 ~ 80 DEG C/sec, cool 690 ~ 740 DEG C, then be cooled to coiling temperature according to the speed of cooling of 5 ~ 10 DEG C/sec;
5) batch, control coiling temperature at 600 ~ 640 DEG C;
6) finishing and rear operation is carried out.
The effect of each component and main technique and the reason of control in the present invention:
Carbon: carbon is cheap solution strengthening element.According to the range of application of this steel grade, be mainly used in processing coating crossbeam, send the parts such as transformer tower, need the Pressing Deformation processing carried out to a certain degree, therefore require that material is while meeting requirement of strength, there is good cold shaping performance.If its content is less than 0.06%, then can not meet the requirement of the strength of materials; If its content is greater than 0.09%, then can not meet the favorable forming property of material.So, its content is limited to 0.06 ~ 0.09% scope.
Silicon: silicon is cheap and effective steel liquid deoxidation element, also can play the effect improving steel strength, but be controlled as harmful element in the present invention.Should be more low better.This is because silicon can worsen the surface quality of hot-rolled steel sheet in the present invention, in follow-up galvanizing process, make surface blackening, affecting it can zinc-plated property simultaneously.Therefore strict control has been carried out for silicone content, its content has been limited to less than 0.023%.Preferably: the weight percent content of Si is no more than 0.02%.
Manganese: manganese improves intensity and the most effective element of toughness.If its content is less than 0.30%, then can not meet strength of materials requirement; But add the manganese of volume, the hardening capacity increasing steel can be caused, owing to welding the appearance of hardened layer, crack sensitivity is increased, and increase the cost of alloy of steel.Given this, be defined as 0.50% by it, so, its content is limited to 0.30 ~ 0.50% scope.
Phosphorus: in order to avoid the welding property of material, stamping formabilily, toughness, suitability for secondary processing worsen, setting its upper content limit is 0.015%.So its content is controlled below 0.015%.
Sulphur: sulphur is the element be harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and the impelling strength of this sulfide inclusion to steel is very disadvantageous, and causes the anisotropy of performance, therefore, sulphur content in steel need be controlled more low better.Based on the consideration to Steel Sheet technique and manufacturing cost, plan sulphur content in steel and control below 0.008%.
Aluminium: aluminium adds in order to deoxidation, when Als is containing quantity not sufficient 0.020%, can not play its effect; On the other hand, the aluminium owing to adding volume easily forms aluminum oxide agglomerate, so the regulation Als upper limit is 0.060%.
For improving the surface quality of steel, what ensure material can zinc-plated property, present invention employs strand high temperature rapid firing technique to carry out strand heating.1200 ~ 1250 DEG C of Heating temperatures that the present invention takes ensure the consoluet minimum temperature of alloying element in steel billet, reduce strand heat-up time simultaneously, being controlled at 30 ~ 40min is stove internal oxidition time in order to reduce steel billet, reduces the iron scale of billet surface, improves surface quality.
About carrying out segmentation rolling, and controlling roughing end temp at 1060 ~ 1100 DEG C, controlling finish rolling finishing temperature at 850 ~ 890 DEG C.
Why the present invention adopts cooling speed change cooling to carry out section cooling, namely being first 60 ~ 80 DEG C/sec at ultrafast cold section according to speed of cooling, to carry out 1-3 front end second cold by force, coiling temperature 600 ~ 640 DEG C is cooled to again according to speed of cooling 5 ~ 10 DEG C/sec, after lot of experiments is analyzed, this type of cooling can, under lower design of alloy, make steel plate reach respective strengths requirement.Adopt sub-sectional cooling mode; can not only ensure also not start to cool in time when growing up at the recrystal grain of steel; avoid the generation of thick tissue; to obtain tiny metallographic structure; increase number of grain boundaries, improve the yield tensile ratio of material, and be conducive to obtaining uniform metallographic structure; enable the precipitate even dispersion such as carbide be distributed in base steel, ensure that material possesses good processability.
The present invention compared with prior art, under lower design of alloy, the coating beam steel produced its there is excellent surface quality and platability, directly can carry out pot galvanize production, meet the requirement of subsequent thermal galvanizer ordered pair plate surface quality, steel plate has yield strength ReL >=340MPa simultaneously, tensile strength Rm:420-540MPa, while elongation A >=25%, 180 ° of transverse bending test D=0.5a are qualified, yield tensile ratio is not less than 0.85, has good dent resistance energy, meets the part great surface qualities such as automotive frame and bearing requirement.
Accompanying drawing explanation
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention;
Table 2 is the main technologic parameters list of various embodiments of the present invention;
Table 3 is the list of various embodiments of the present invention performance monitoring situation.
Various embodiments of the present invention are produced according to following steps:
1) after converter smelting, enter argon station Argon, and routine adds aluminum steel deoxidation and composition adjustment; Control argon blowing time: bottom blowing is not less than 4min, and top blast is not less than 5min;
2) through tapping and continuous casting becomes to strand heating after base, its heating and temperature control at 1200 ~ 1250 DEG C, heat-up time 30 ~ 40min;
3) carry out segmentation hot rolling, and control roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature at 850 ~ 890 DEG C;
4) adopt the speed change degree type of cooling to carry out section cooling, that is: first under speed of cooling is 60 ~ 80 DEG C/sec, be cooled to 690 ~ 740 DEG C, then be cooled to coiling temperature according to the speed of cooling of 5 ~ 10 DEG C/sec;
5) batch, control coiling temperature at 600 ~ 640 DEG C;
6) finishing and rear operation is carried out.
The composition value list (wt%) of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Table 3 various embodiments of the present invention and comparative example mechanical properties test the results list
Can analyze from table 3, alloying constituent of the present invention, far below comparative example, has carried out strict restriction to Si element simultaneously, under production technique of the present invention, obtains the mechanical property close with comparative example, has better surface quality simultaneously.
This embodiment is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (3)
1. a 340MPa level automotive frame coated steel, its chemical composition and weight percent content are: C:0.06 ~ 0.09%, Si≤0.023%, Mn:0.30 ~ 0.50%, P≤0.015%, S≤0.008%, Als:0.020 ~ 0.060%, surplus is Fe and inevitable impurity.
2. a kind of 340MPa level automotive frame coated steel as claimed in claim 1, is characterized in that: the weight percent content of Si is no more than 0.02%.
3. produce a kind of method of 340MPa level automotive frame coated steel, its step:
1) after converter smelting, enter argon station Argon, and routine adds aluminum steel deoxidation and composition adjustment; Control argon blowing time: bottom blowing is not less than 4min, and top blast is not less than 5min;
2) through tapping and continuous casting becomes to strand heating after base, its heating and temperature control at 1200 ~ 1250 DEG C, heat-up time 30 ~ 40min;
3) carry out segmentation hot rolling, and control roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature at 850 ~ 890 DEG C;
4) adopt the speed change degree type of cooling to carry out section cooling, that is: first under speed of cooling is 60 ~ 80 DEG C/sec, cool 690 ~ 740 DEG C, then be cooled to coiling temperature according to the speed of cooling of 5 ~ 10 DEG C/sec;
5) batch, control coiling temperature at 600 ~ 640 DEG C;
6) finishing and rear operation is carried out.
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| CN104294144A (en) * | 2014-10-10 | 2015-01-21 | 武汉钢铁(集团)公司 | Steel for automobile rim having tensile strength equal to or greater than 380MPa and production method of steel |
| CN104831207A (en) * | 2015-04-16 | 2015-08-12 | 河北钢铁股份有限公司邯郸分公司 | Thin gauge 600MPa grade hot galvanized plate production method |
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| CN101230436A (en) * | 2008-02-26 | 2008-07-30 | 山东泰山钢铁集团有限公司 | Common low-carbon low-silicon hot-rolling steel belt and method for manufacturing same |
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