CN105112778B - A kind of 460MPa level automotive frame coated steel and its ultrafast cold production method - Google Patents
A kind of 460MPa level automotive frame coated steel and its ultrafast cold production method Download PDFInfo
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Abstract
A kind of 460MPa level automotive frame coated steel, its chemical composition and wt% are：C：0.06 ~ 0.09%, Si≤0.027%, Mn：1.00 ~ 1.20%, P≤0.015%, S≤0.008%, Als：0.020 ~ 0.060%, Nb：0.020~0.030%；Production stage：Argon station Argon is entered after converter smelting；Tap and be casting continuously to form after base to heating strand；Segmentation hot rolling；Carry out section cooling using becoming the speed type of cooling；Batch；Finishing and rear operation.The present invention is under relatively low design of alloy, cooled down and sub-sectional cooling using becoming speed, on the premise of the mechanical property ensureing steel plate, the coating beam steel being produced its there is excellent surface quality and platability, galvanizing production can directly be carried out, and the dent resistance of steel plate, coating adhesion is further enhanced, and surface quality is good.
Description
Technical field
The present invention relates to a kind of automobile steel and production method, specifically belong to a kind of 460MPa level automotive frame coating
Steel and its ultrafast cold production method.
Background technology
Coating hot-rolled steel is used widely in the automotive frame higher for surface quality requirements.Hot-dip galvanizing sheet steel table
Face has coating light, uniform color, the feature of 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 manufacturing high-strength vehicle structural member and its surface galvanizing.
For this reason, steel industry manufacturer is all in the research actively developing the parties concerned and development.
In prior art, the cooling for steel plate is all cooled to requirement using a relatively low or conventional stable rate of cooling
Temperature, a large amount of analysis and research through the applicant, using this type of cooling produce steel plate, for reaching intensity and the group of regulation
Knit, generally require to add more alloying element, production cost is higher.
Through preliminary search, Chinese Patent Application No. is the document of CN200910063433.0, discloses a kind of yield strength
The production method of 460MPa level coating hot-rolled structural steel, it includes in turn including the following steps：Steel-making, continuous casting, heating of plate blank,
Hot continuous rolling, section cooling, batch；It is characterized in that in the chemical analysis of steelmaking process and percentage by weight being：C：0.05～
0.10%；Si≤0.04；Mn：1.30～1.65%；P≤0.030%；S≤0.012%；Als：0.01～0.06%；Nb：
0.035～0.060%；Balance of Fe and being inevitably mingled with；Controlled rolling, wherein slab heating temperature is adopted in hot rolling
For 1200～1260 DEG C；Roughing outlet temperature is 1020～1080 DEG C；Hot rolling finishing temperature is 790～850 DEG C；In coiling process
In, coiling temperature is 540～600 DEG C.The technical scheme enumerated is：C：0.075%；Si：0.02%；Mn：1.5%；P：0.02%；S：
0.01%；Als：0.03%；Nb：0.050%；1230 DEG C of slab heating temperature；820 DEG C of finishing temperature；570 DEG C of coiling temperature.This article
Offer the conventional laminar flow type of cooling being to adopt after hot rolled, it exists, and the alloy content of steel design is high, and relatively costly asks
Topic.
Content of the invention
The present invention in view of the shortcomings of the prior art, provides one kind ensureing yield strength >=460MPa, tensile strength
520-670MPa, elongation percentage can reach A >=19%, and 180 ° of cross bending test D=1a are qualified, and yield tensile ratio reaches more than 0.85
Under the premise of, by using supper-fast sub-sectional cooling technique after rolling, and under relatively low alloying component, improve the dent resistance of steel plate,
460MPa level automotive frame coated steel and production method that coating adhesion is further enhanced.
Realize the measure of above-mentioned purpose：
A kind of 460MPa level automotive frame coated steel, its chemical composition and weight percent content are：C：0.06~
0.09%, Si≤0.027%, Mn：1.00 ~ 1.20%, P≤0.015%, S≤0.008%, Als：0.020 ~ 0.060%, Nb：0.020~
0.030%, balance of Fe and inevitable impurity.
Preferably：The weight percent content of Si is less than 0.02%.
Preferably：The weight percent content of Nb is 0.023 ~ 0.028%.
Produce a kind of method of 460MPa level automotive frame coated steel, its step：
1）Enter argon station Argon after converter smelting, and conventional plus 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）Through tapping and being casting continuously to form to heating strand after base, its heating and temperature control at 1265 ~ 1300 DEG C, 30 during heating ~
40min；
3）Carry out segmentation hot rolling, and control roughing end temp at 1070 ~ 1100 DEG C, control finish rolling finishing temperature 865 ~
890℃；
4）Carry out section cooling using becoming the speed type of cooling, that is,：First cool down under rate of cooling is 120 ~ 140 DEG C/sec
To 700 ~ 740 DEG C, the rate of cooling according still further to 5 ~ 10 DEG C/sec is cooled to coiling temperature；
5）Batched, controlled coiling temperature at 620 ~ 640 DEG C；
6）Carry out finishing and rear operation.
In the present invention effect of each component and main technique and control the reasons why：
Carbon：Carbon is cheap solution strengthening element.According to the range of application of this steel grade, it is mainly used in processing coating with greatly
Beam, send the parts such as transformer tower, need 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 forming performance.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 be cheap and effective deoxygenation of liquid steel element it is also possible to play the effect improving steel strength, but at this
It is controlled by as harmful element in bright.Should be more low better.This is because silicon can deteriorate hot-rolled steel in the present invention
The surface quality of plate, makes surface blackening in follow-up galvanizing process simultaneously, and affecting it can zinc-plated property.Therefore silicone content is carried out
Strict control, its content is limited to less than 0.027%.Preferably：The weight percent content of Si is less than 0.02%.
Manganese：Manganese is to improve intensity and the maximally effective element of toughness.If its content is less than 1. 00%, material can not be met
Intensity requirement；But add the manganese of volume, can lead to increase the quenching degree of steel, 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, 1.20% will be defined to thereon, so, its content is limited to 1.
00～1.20% scope.
Phosphorus：In order to avoid the welding performance of material, stamping formabilily, toughness, suitability for secondary processing deteriorate, set
Its upper content limit is 0.015%.So its content is controlled below 0.015%.
Sulfur：Sulfur is very harmful element.Sulfur in steel is often existed with the oxide morphology of manganese, this sulphide inculsion pair
The impact flexibility of steel is very unfavorable, and causes the anisotropy of performance, therefore, sulfur content in steel need to be controlled more low more
Good.Based on the consideration to Steel Sheet technique Manufacturing cost, plan sulfur content in steel and control below 0.008%.
Aluminum：Aluminum adds for deoxidation, when Als content is less than 0.020% it is impossible to play its effect；The opposing party
Face, the aluminum due to adding volume easily forms aluminium oxide agglomerate, so it is stipulated that the Als upper limit is 0.060%.Therefore, Als content limit
It is scheduled on 0.020～0.060% scope.
Niobium：Niobium mainly improves the intensity of steel by crystal grain thinning and precipitation hardening, is strong carbon, nitrogen compound
Form element, main in steel existed with Nb (C, N) form, stops growing up of austenite crystal, finally makes ferrite crystal grain chi
Very little diminish, thinning microstructure.When its content is less than 0.020% it is impossible to meet the requirement of material high intensity；And the niobium adding is higher than
When 0.030%, can meet the requirement of its intensity and processability, if adding, cost of alloy can significantly rise again.So, according to
The performance objective of steel grade requires, and its content is limited to 0.020～0.030% scope.Preferably：The weight percent content of Nb
0.023 ~ 0.028%.
For improve steel surface quality it is ensured that material can zinc-plated property, present invention employs strand high temperature rapid firing technique
To carry out heating strand, to be one of critical process.The present invention takes 1265 ~ 1300 DEG C of heating-up temperatures to be to ensure that the alloy in steel billet
The minimum temperature that element is completely dissolved, reduces the heating strand time, being controlled in 30 ~ 40min is to reduce steel billet simultaneously
The stove internal oxidition time, reduce billet surface iron scale, improve surface quality.
With regard to carrying out segmentation rolling, and control roughing end temp at 1070 ~ 1100 DEG C, control finish rolling finishing temperature to exist
865~890℃.
Why the present invention carries out section cooling using cooling speed change cooling, at ultrafast cold section according to rate of cooling is first
120 ~ 140 DEG C/sec carry out that front end is cold by force, and according still further to rate of cooling, 5 ~ 10 DEG C/sec are cooled to 620 ~ 640 DEG C of coiling temperature, be through
After lot of experiments analysis, this type of cooling can make steel plate reach respective strengths and require under relatively low design of alloy.
Using sub-sectional cooling mode, not only can guarantee that the recrystal grain in steel does not have started and cooled down in time when growing up, it is to avoid
The generation of thick tissue, to obtain tiny metallographic structure, increases number of grain boundaries, improves the yield tensile ratio of material, and be conducive to
To uniform metallographic structure, so that the precipitate even dispersion such as carbide is distributed in base steel it is ensured that material possess good
Cold forming performance.
The present invention compared with prior art, under relatively low design of alloy, using ultra-rapid cooling and sub-sectional cooling
Technique, the coating beam steel being produced its there is excellent surface quality and platability, directly can carry out galvanizing production, full
The requirement of sufficient subsequent thermal galvanizer ordered pair plate surface quality, simultaneously steel plate there is yield strength ReL >=460MPa, tensile strength
520-670MPa, elongation percentage can reach A >=19%, and 180 ° of cross bending test D=1a are qualified, and yield tensile ratio reaches more than 0.85
Under the premise of, improve the dent resistance of steel plate, coating adhesion is further enhanced, and has good surface quality.
Brief description
Accompanying drawing is metallographic structure figure of the present invention.
Specific embodiment
Below the present invention is described in detail：
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 text list.
Various embodiments of the present invention produce according to following steps：
1）Enter argon station Argon after converter smelting, and conventional plus 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）Through tapping and being casting continuously to form to heating strand after base, its heating and temperature control at 1265 ~ 1300 DEG C, 30 during heating ~
40min；
3）Carry out segmentation hot rolling, and control roughing end temp at 1070 ~ 1100 DEG C, control finish rolling finishing temperature 865 ~
890℃；
4）Carry out section cooling using becoming the speed type of cooling, that is,：First cool down under rate of cooling is 120 ~ 140 DEG C/sec
To 700 ~ 740 DEG C, the rate of cooling according still further to 5 ~ 10 DEG C/sec is cooled to coiling temperature；
5）Batched, controlled coiling temperature at 620 ~ 640 DEG C；
6）Carry out finishing and rear operation.
Table 1 various embodiments of the present invention and the composition value list of comparative example（wt%）
Table 2 various embodiments of the present invention and the main technologic parameters list of comparative example
Table 3 various embodiments of the present invention and comparative example mechanical properties test the results list
Can analyze from table 3, the present invention using under ultra-rapid cooling and sub-sectional cooling technique, with far below comparative example
Design of alloy, obtain the mechanical property close with comparative example, production cost is substantially reduced, product is cold simultaneously
Forming property is improved, and is 2 times of comparative example.
This specific embodiment only most preferably enumerates, not the restricted enforcement to technical solution of the present invention.
Claims (1)
1. produce a kind of method of 460MPa level automotive frame coated steel, its step：
1）Enter argon station Argon after converter smelting, and conventional plus aluminum steel deoxidation and composition adjustment；Control argon blowing time：Bottom blowing is not
Less than 4min, top blast is not less than 5min；Molten steel terminal chemical composition and weight percent content are：C：0.06 ~ 0.09%, Si≤
0.027%, Mn：1.00 ~ 1.20%, P≤0.015%, S≤0.008%, Als：0.020 ~ 0.060%, Nb：0.020 ~ 0.029%, remaining
Measure as Fe and inevitable impurity；
2）Through tapping and being casting continuously to form to heating strand after base, its heating and temperature control at 1265 ~ 1300 DEG C, 30 during heating ~
40min；
3）Carry out segmentation hot rolling, and control roughing end temp at 1070 ~ 1100 DEG C, control finish rolling finishing temperature 865 ~ 890
℃；
4）Carry out section cooling using becoming the speed type of cooling, that is,：First under rate of cooling is 120 ~ 140 DEG C/sec, it is cooled to 705
~ 740 DEG C, the rate of cooling according still further to 5 ~ 7 DEG C/sec is cooled to coiling temperature；
5）Batched, controlled coiling temperature at 623 ~ 640 DEG C；
6）Carry out finishing and rear operation.
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| CN102094149A (en) * | 2011-03-08 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Niobium-containing high-strength hot-galvanized steel plate and production method thereof |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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