CN105088064B - A kind of 340MPa levels automotive frame coated steel and production method - Google Patents
A kind of 340MPa levels automotive frame coated steel and production method Download PDFInfo
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- CN105088064B CN105088064B CN201510544962.8A CN201510544962A CN105088064B CN 105088064 B CN105088064 B CN 105088064B CN 201510544962 A CN201510544962 A CN 201510544962A CN 105088064 B CN105088064 B CN 105088064B
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Abstract
A kind of 340MPa levels automotive frame coated steel, its chemical composition and wt% 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%；Production stage：Enter argon station Argon after converter smelting；Tap and be casting continuously to form after base to heating strand；It is segmented hot rolling；Section cooling is carried out using the speed type of cooling is become；Batch；Finishing and rear process.The present invention is under relatively low design of alloy, using the cooling of change speed and sub-sectional cooling, on the premise of the mechanical property of steel plate is ensured, the coating beam steel produced its there is good dent resistance energy, galvanizing production can be directly carried out, and meets the part such as automotive frame great surface quality and bearing requirement.
Description
Technical field
The present invention relates to a kind of automobile steel and production method, specifically belongs to a kind of 340MPa levels automotive frame coating
Steel and production method.
Background technology
Coating is used widely with hot-rolled steel for the higher automotive frame of surface quality requirements.Hot-dip galvanizing sheet steel table
Face has the characteristics of coating light, uniform color, good durability and aesthetic property；Meanwhile the part such as automotive frame also requires
Steel have good dent resistance, and should have high-yield-ratio.
At present, with regard to its beam steel still in the rank steel grade such as Q345, Q235, then in such steel grade surface hot galvanized layer.
Due to the continuous development of auto industry, it can not meet the requirement for manufacturing high-strength vehicle structural member and its surface galvanizing.
Therefore, steel industry manufacturer is actively developing the research and development of the parties concerned.
In the prior art, the cooling for steel plate is cooled to requirement using a relatively low or conventional stable cooling velocity
Temperature, a large amount of analysis and research through the applicant, the steel plate produced using this type of cooling, for intensity as defined in reaching and group
Knit, generally require to add more alloying element, production cost is higher.
Through preliminary search, Chinese Patent Application No. is CN201310064053.5 document, discloses a kind of 400MPa levels
Zinc-plated high strength construction steel above, 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 Fe.Although the document is by using addition
Micro Nb elements reach the purpose for improving intensity, so as to reduce the addition of C, Si, Mn element, improve welding performance, change
It has been apt to the fragility of steel, has improved extension property.But it is present：One is due to it using Si as effective element, and content is high, this
Steel billet can be made easily to produce substantial amounts of Si oxide in heating process, and have a strong impact on plate surface quality.Simultaneously in steel
Si contents height can also generate loose ζ alloy phases in follow-up galvanizing, cause coating the problem of adhesive force decline occur,
Make it is zinc-plated after surface quality further deteriorate, and cause qualification rate to decline, more mainly can not meet automobile production manufacturer
Requirements at the higher level.On the other hand, it is cooled in 10~30 DEG C/sec of cooling velocity after cooling stage is using first slow cooling and set
Constant temperature degree, easily causes that steel Tissue distribution is uneven, so as to influence the stability of plate property.
The content of the invention
The present invention is in view of the deficienciess of the prior art, provide a kind of in guarantee yield strength >=340MPa, tensile strength
420-540MPa, elongation percentage can reach A >=25%, and 180 ° of cross bending test D=0.5a are qualified, before yield tensile ratio reaches 0.85
Put, by using rear supper-fast sub-sectional cooling technique is rolled, though being extremely low alloying component, coating adhesion obtains further
Improve, it is zinc-plated after the more excellent 340MPa level automotive frame coated steels and production method of plate surface quality.
Realize the measure of above-mentioned purpose：
A kind of 340MPa levels 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 Fe
And inevitable impurity.
Preferably：Si weight percent content is no more than 0.02%.
Produce a kind of method of 340MPa levels automotive frame coated steel, its step：
1）Enter argon station Argon after converter smelting, and routinely add aluminum steel deoxidation and composition adjustment；Control argon blowing time：Bottom
Blow and be not less than 4min, top blast is not less than 5min；
2）To heating strand after tapping and being casting continuously to form base, its heating and temperature control is at 1200 ~ 1250 DEG C, the heat time
30~40min；
3）Segmentation hot rolling is carried out, and controls roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature is 850
~890℃；
4）Section cooling is carried out using the speed type of cooling is become, i.e.,：Cooled down under being first 60 ~ 80 DEG C/sec in cooling velocity
690 ~ 740 DEG C, coiling temperature is cooled to according still further to 5 ~ 10 DEG C/sec of cooling velocity；
5）Batched, control coiling temperature is at 600 ~ 640 DEG C；
6）Carry out finishing and rear process.
In the present invention the reasons why effect and control of each component and main technique：
Carbon：Carbon is cheap solution strengthening element.According to the application of this steel grade, it is mainly used in processing coating with greatly
Beam, the parts such as transformer tower are sent, it is necessary to carry out a certain degree of Pressing Deformation processing, therefore it is required that material is meeting intensity requirement
Meanwhile there is good cold formability energy.If its content is less than 0.06%, the requirement of the strength of materials can not be met；If its
Content is more than 0.09%, then can not meet the favorable forming property of material.So its content is limited to 0.06~0.09% model
Enclose.
Silicon：Silicon is cheap and effective deoxygenation of liquid steel element, can also play a part of improving steel strength, but in this hair
It is controlled by bright as harmful element.Should be more low better.Because silicon can deteriorate hot-rolled steel in the present invention
The surface quality of plate, while make surface blackening in follow-up galvanizing process, influenceing it can zinc-plated property.Therefore carried out for silicone content
Strict control, by its content is limited to less than 0.023%.Preferably：Si weight percent content is no more than 0.02%.
Manganese：Manganese is to improve intensity and the maximally effective element of toughness.If its content is less than 0.30%, material can not be met
Intensity requirement；But the manganese of addition volume, the quenching degree for increasing steel can be caused, make crackle quick due to welding the appearance of hardened layer
Perception increases, and increases the cost of alloy of steel.In consideration of it, 0.50% will be defined to thereon, so, its content is limited to
0.30~0.50% scope.
Phosphorus：In order to avoid the welding performance of material, stamping formabilily, toughness, suitability for secondary processing deteriorate, setting
Its upper content limit is 0.015%.So by the control of its content below 0.015%.
Sulphur：Sulphur is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, this sulphide inculsion pair
The impact flexibility of steel is anisotropy that is very unfavorable, and causing performance, therefore, sulfur content in steel need to be controlled more low more
It is good.Based on the consideration to Steel Sheet technique and manufacturing cost, plan sulfur content in steel and control below 0.008%.
Aluminium：Aluminium adds for deoxidation, when Als contents are less than 0.020%, it is impossible to play its effect；The opposing party
Face, because the aluminium for adding volume easily forms aluminum oxide agglomerate, so, it is specified that the Als upper limits are 0.060%.
For improve steel surface quality, ensure material can zinc-plated property, present invention employs strand high temperature rapid firing technique
To carry out heating strand.1200 ~ 1250 DEG C of heating-up temperatures that the present invention takes are to ensure that the alloying element in steel billet is completely dissolved
Minimum temperature, while reduce the heating strand time, controlled in 30 ~ 40min when being to reduce the stove internal oxidition of steel billet
Between, the iron scale of billet surface is reduced, improves surface quality.
On carrying out segmentation rolling, and roughing end temp is controlled at 1060 ~ 1100 DEG C, control finish rolling finishing temperature exists
850~890℃。
The present invention why using cooling speed change cooling carry out section cooling, i.e., first ultrafast cold section according to cooling velocity be 60
~ 80 DEG C/sec carry out that 1-3 second front ends are cold by force, and 5 ~ 10 DEG C/sec are cooled to 600 ~ 640 DEG C of coiling temperature according still further to cooling velocity, be through
After lot of experiments analysis, this type of cooling can make steel plate reach respective strengths requirement under relatively low design of alloy.
Using sub-sectional cooling mode, the recrystal grain that not only can guarantee that in steel does not have started and cooled down in time when growing up, avoided
The generation of thick tissue, to obtain tiny metallographic structure, increase number of grain boundaries, improve the yield tensile ratio of material, and be advantageous to
To uniform metallographic structure, the precipitate even dispersion such as carbide is distributed in base steel, it is good to ensure that material possesses
Processability.
Compared with prior art, under relatively low design of alloy, with beam steel, it has the coating produced the present invention
There are excellent surface quality and platability, can directly carry out galvanizing production, meet subsequent thermal galvanizer ordered pair surface of steel plate matter
The requirement of amount, while steel plate has yield strength ReL >=340MPa, tensile strength Rm:420-540MPa, elongation A >=25%
Meanwhile 180 ° of cross bending test D=0.5a are qualified, yield tensile ratio is not less than 0.85, has good dent resistance energy, meets automobile
The part such as crossbeam great surface quality and bearing requirement.
Brief description of the drawings
Accompanying drawing is metallographic structure figure of the present invention.
Embodiment
The present invention is described in detail below：
Table 1 is the comparative example 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 various embodiments of the present invention performance monitoring situation list.
Various embodiments of the present invention produce according to following steps：
1）Enter argon station Argon after converter smelting, and routinely add aluminum steel deoxidation and composition adjustment；Control argon blowing time：Bottom
Blow and be not less than 4min, top blast is not less than 5min；
2）To heating strand after tapping and being casting continuously to form base, its heating and temperature control is at 1200 ~ 1250 DEG C, the heat time
30~40min；
3）Segmentation hot rolling is carried out, and controls roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature is 850
~890℃；
4）Section cooling is carried out using the speed type of cooling is become, i.e.,：It is cooled under being first 60 ~ 80 DEG C/sec in cooling velocity
690 ~ 740 DEG C, coiling temperature is cooled to according still further to 5 ~ 10 DEG C/sec of cooling velocity；
5）Batched, control coiling temperature is at 600 ~ 640 DEG C；
6）Carry out finishing and rear process.
The composition value list of the various embodiments of the present invention of table 1 and comparative example（wt%）
The main technologic parameters list of the various embodiments of the present invention of table 2 and comparative example
The various embodiments of the present invention of table 3 and comparative example mechanical properties test the results list
It can be analyzed from table 3, alloying component of the invention is far below comparative example, while strict limit has been carried out to Si elements
System, under the production technology of the present invention, obtain with comparative example similar in mechanical property, while there is more preferable surface quality.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (1)
1. a kind of yield strength of production is the method for 340MPa level automotive frame coated steels, its step：
The chemical composition and weight percent content of the coated steel be：C：0.07 ~ 0.09%, Si≤0.023%, Mn：0.32~
0.35% or Mn：0.41 ~ 0.47%, P≤0.015%, S≤0.008%, Als：0.020 ~ 0.060%, surplus is for Fe and unavoidably
Impurity；
1）Enter argon station Argon after converter smelting, and routinely add aluminum steel deoxidation and composition adjustment；Control argon blowing time：Bottom blowing is not
Less than 4min, top blast is not less than 5min；
2）To heating strand after tapping and being casting continuously to form base, its heating and temperature control at 1200 ~ 1211 DEG C, the heat time 30 ~
40min；
3）Segmentation hot rolling is carried out, and controls roughing end temp at 1020 ~ 1080 DEG C, control finish rolling finishing temperature is 850 ~ 870
℃；
4）Section cooling is carried out using the speed type of cooling is become, i.e.,：The first cooling 712 in the case where cooling velocity is 60 ~ 80 DEG C/sec ~
740 DEG C, coiling temperature is cooled to according still further to 5 ~ 6 DEG C/sec of cooling velocity；
5）Batched, control coiling temperature is at 630 ~ 640 DEG C；
6）Carry out finishing and rear process.
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