CN104988398B - 610MPa levels steel for automobile crossbeam and its manufacture method - Google Patents

610MPa levels steel for automobile crossbeam and its manufacture method Download PDF

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CN104988398B
CN104988398B CN201510422169.0A CN201510422169A CN104988398B CN 104988398 B CN104988398 B CN 104988398B CN 201510422169 A CN201510422169 A CN 201510422169A CN 104988398 B CN104988398 B CN 104988398B
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steel
610mpa
manufacture
niobium
automobile crossbeam
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CN104988398A (en
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赵江涛
刘永前
彭涛
王立新
张扬
王孟
贺啸秋
刘斌
梁文
周祖安
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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Abstract

The invention discloses a kind of 610MPa levels steel for automobile crossbeam, and by weight percentage, each chemical constituent is in steel:Carbon:0.07%~0.09%;Silicon<0.10%;Manganese:1.50%~1.65%;Phosphorus≤0.015%;Sulphur≤0.010%;It is dissolved aluminium:0.020%~0.070%;Niobium:0.045~0.065%;Titanium:0.003~0.01%;Nitrogen≤0.004%;Surplus is iron, copper, nickel and inevitable impurity.The invention also discloses the manufacture method of the steel.The present invention is in the Design of Chemical Composition of steel grade, the characteristics of fully taking into account steel for automobile crossbeam, based on the solution strengthening elements such as manganese, niobium, titanium and precipitation strength element, steel plate is set to obtain ferrite and pearlite tissue by controlled rolling and leading portion laminar flow cooling technology.Used as beam steel, outside upper and outer lower reinforcing plate can be cancelled in frame assembly design, so as to mitigate the weight of frame assembly, improve the bearing capacity of large car.

Description

610MPa levels steel for automobile crossbeam and its manufacture method
Technical field
The invention belongs to steel technical field, and in particular to a kind of 610MPa levels steel for automobile crossbeam and its manufacture method.
Background technology
At present, 440MPa levels, the production technology of 510MPa rank beam steels are quite ripe, in the application of auto industry It is wide.But with Domestic Automotive Industry and traffic, the rapid development of transport service, the quickening of particularly high-grade highway Build, vehicle starts to develop to maximization, and the demand of large-tonnage truck and large-scale palace car is continuously increased.In order to subtract The weight of light automobile component reaches to reduce its deadweight and saves the energy, mitigates environmental pollution and improve the purpose of delivery efficiency, high Performance Hot Rolling Automobile steel plate also begins to popularization as the application of automotive frame.
At home and abroad, mostly at this stage is to strengthen the intensity of steel using certain microalloy element is added.610MPa ranks Safety load-bearing part of the beam steel as passenger-cargo carriage, have very high requirement to performance and formability.Truck and large-scale passenger-cargo Crossbeam is typically manufactured using 3~12mm hot rolled steel plate.Automotive frame is both the supporting part of passenger-cargo carriage, and garage crosses Safety member in journey.In large-scale bogie Vehicle Frame Design, made using hot rolling automotive frame steel, its frame assembly is divided into vertical Beam, lining beam, crossbeam, reinforcer and reinforcing plate etc., each parts are to use cold punching pressing formation or rolling forming mode, and it is assembled Mainly use riveting method.In order to improve the bearing capacity of frame assembly, designed and produced using the other beam steel of low intensity level When, longitudinal beam also add the reinforcement structure of outside upper and outer lower reinforcing plate in addition to interior reinforcing plate is used (lining beam).
The content of the invention
A technical problem to be solved by this invention is to provide a kind of 610MPa levels steel for automobile crossbeam, and the steel not only has There are higher intensity, good plasticity and low-temperature flexibility, also with excellent cold stamping and roll forming, stronger fatigability Can, high dimensional accuracy and surface quality, can preferably deal with various impacts, torsion that automobile is subject in the process of moving etc. The effect of complex stress.The specific performance of the steel requires:Lower yield strength ReL≥500MPa;Tensile strength Rm≥610MPa; Elongation A >=18%;Wide clod wash (b=35mm) is functional (d=0mm).
Another technical problem to be solved by this invention is to provide the manufacture method of above-mentioned crossbeam steel.
To solve above-mentioned first technical problem, the technical scheme designed by the present invention is:A kind of 610MPa levels automobile is big Beam steel, by weight percentage, each chemical constituent is:Carbon:0.07%~0.09%;Silicon<0.10%;Manganese:1.50%~ 1.65%;Phosphorus≤0.015%;Sulphur≤0.010%;It is dissolved aluminium (Als):0.020%~0.070%;Niobium:0.045~ 0.065%;Titanium:0.003~0.01%;Nitrogen≤0.004%;Surplus is iron, copper, nickel and inevitable impurity.
Preferably, by weight percentage, in the chemical constituent of steel, copper≤0.30%, nickel≤0.30%.
In order to solve above-mentioned second technical problem, the technical scheme designed by the present invention is:A kind of 610MPa levels automobile The manufacture method of crossbeam steel, the technological process of production of this method are:Desulfurizing iron → converter smelting → application of vacuum → continuous casting → finishing (slab inspection and cleaning) → heating of plate blank → hot continuous rolling → is cooled down → batched.
Alloying order is ferro-aluminum → ferromanganese → ferro-niobium wherein in converter steelmaking process, adds aluminum steel to carry out eventually using aluminium machine is added Deoxidation, ferrotianium is added in the application of vacuum later stage.
Wherein Hot Strip Rolling heating-up temperature is 1200~1300 DEG C, and roughing outlet temperature is 1040~1140 DEG C, finish to gauge Temperature is 800~860 DEG C.
Wherein the coiling temperature of coiling process is 550~590 DEG C, and the type of cooling is leading portion section cooling.
The desirable chemical composition and hot continuous rolling production technology of hot rolled steel plate of the invention are illustrated below.
(1) chemical composition
Carbon is cheap solution strengthening element.If its content, more than 0.09%, press formability can reduce;If its Content is less than 0.07%, then can not meet requirement of the material to intensity, so, its content is limited to 0.07%~0.09% model Enclose.
Silicon is combined during heating process with oxygen, iron, is formed olive-shaped iron scale, is tightly attached to surface of steel plate, is not easy Wash out, oxide skin load mould is formed in the operation of rolling, deteriorate the surface quality of hot rolled steel plate, so, its content is limited to< 0.10% scope.
Manganese is to improve intensity and the maximally effective element of toughness, can improve intensity-extension balance of steel.But addition volume Manganese, the quenching degree for increasing steel can be caused, in consideration of it, 1.65% will be defined to thereon, so, its content is limited to 1.50% ~1.65% scope.
Phosphorus is the harmful element in steel, easily causes center segregation of casting blank, in order to avoid cold bending performance, toughness are disliked Change, set its upper content limit as 0.015%.
Sulphur is very harmful element.Sulphur in steel often exists with the oxide morphology of manganese, and this sulphide inculsion is to steel Impact flexibility be 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 plate cold bending forming technology and manufacturing cost, by sulfur content control in steel below 0.010%.
Aluminium adds for deoxidation, when Als contents are less than 0.020%, it is impossible to play its effect;On the other hand, Because the aluminium for adding volume easily forms aluminum oxide agglomerate, so, it is specified that the Als upper limits are 0.070%.Therefore, Als contents limit In 0.020%~0.070% scope.
Niobium is indispensable element in non-recrystallization controlled rolling, crystal grain thinning, reduction Ovshinsky in thermomechanical processing Body adds trace alloying element niobium to ferritic transition temperature and precipitation strength, therefore in steel can be easy to entering for controlled rolling OK, the intensity and toughness of steel plate are improved and.So the consideration of comprehensive mechanical property of steel plate and cost etc., its content is limited It is scheduled on 0.045~0.065% scope.
Titanium is micro alloying element, and micro titanium is added in steel, can be very good to change the pattern of sulphide inculsion, obtains Good cold-bending property, also, with carbon and the compound precipitation of nitrogen, crystal grain thinning, play certain reinforcing conduct.So contained Amount is limited to 0.003~0.01% scope.
N element is harmful element, easily combines to form metallic inclusion with titanium, weakens the effect of titanium.So by its content It is limited to≤0.004%.
Alloying order:Ferro-aluminum → ferromanganese → ferro-niobium, using adding aluminium machine to add aluminum steel to carry out final deoxidizing, in the application of vacuum later stage Add ferrotianium.
In addition to having made to limit to the scope of above chemical composition, from the viewpoint of formability, economy is improved, Cu, Ni content are limited to less than 0.30%.
The steel for being adjusted to mentioned component scope is melted out, is cast with continuous cast method, its slab can use the cold side sent Formula is sent to hot rolling mill and rolled.
The present invention is in the Design of Chemical Composition of steel grade, the characteristics of fully taking into account steel for automobile crossbeam, with manganese, niobium, titanium Based on solution strengthening element and precipitation strength element, sulfur content in steel is reduced by desulfurizing iron, by Blowing Converter and Furnace outer refining technology (application of vacuum) dephosphorization simultaneously adjusts molten steel alloying component, is made by controlled rolling and leading portion laminar flow cooling technology Steel plate obtains ferrite+pearlitic structrure.The performance for the 610MPa level steel for automobile crossbeam that the inventive method is produced:Lower surrender Intensity ReL≥500MPa;Yield tensile ratio>0.85, tensile strength RmFor 610~710MPa;Elongation A is 18~27%;Wide clod wash (b =35mm) functional (d=0mm).Used as beam steel, outside upper and outer lower reinforcement can be cancelled in frame assembly design Plate, so as to further mitigate the weight of frame assembly (in Vehicle Frame Design weight loss effect up to 10%~20%), improve big The bearing capacity of type car, and the good moldability of the crossbeam steel, suitable for techniques such as punching press, roll-in, bendings.
Embodiment:
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Table 1 lists the chemical composition that the present invention can be used for six kinds of specific embodiments of production 610MPa level hot-rolled steels.This The production method of six kinds of 610MPa level hot-rolled steels is as follows:Top bottom blowing is carried out in 90 tons and 250 tons converters of steel mill, is adopted With Desulphurization of Pig Iron, make S≤0.006% in molten iron;Tapped after stove 1/3 when start plus ferroalloy, added during tapping 2/3 Finish, alloying order:Ferro-aluminum → ferromanganese → ferro-niobium, using add aluminium machine add aluminum steel carry out final deoxidizing, in application of vacuum carry out into Divide fine setting, wherein adding ferrotianium in the application of vacuum later stage, meet the chemical composition in steel:Carbon:0.07%~0.09%;Silicon< 0.10%;Manganese:1.50%~1.65%;Phosphorus≤0.015%;Sulphur≤0.010%;It is dissolved aluminium (Als):0.020%~ 0.070%;Niobium:0.045~0.065%;Titanium:0.003~0.01%;Nitrogen≤0.004% (actual constituent is shown in Table 1);Surplus is Iron, copper, nickel and inevitable impurity.Again by the pouring molten steel of composition shown in table 1 into 230~250mm × 1050~2150mm The slab of section.Then slab is delivered into hot rolling mill, hot continuous rolling is carried out on 2250mm milling trains, is rolled into hot-rolled sheet coil, Finishing is carried out again;Continuous casting steel billet is first heated to 1200~1300 DEG C of progress roughing, end temp is 1040~1140 DEG C, then is entered Row finish rolling, finishing temperature are 800~860 DEG C, and the control after strip rolls is cooled down by the way of leading portion section cooling, cooling water 35 DEG C of water temperature <, it is≤25 DEG C/s to control cooling velocity, and coiling temperature is 550~590 DEG C.Roll coil of strip and carry out table in finishing line Face quality examination, and plate shape is further controlled, finally give 3~8mm hot rolled coil.
The mechanical property test result of steel of the present invention is listed in table 2, and from the point of view of the performance that table 2 reflects, thickness is 3~8mm The hot rolled coil performance of each composition all reaches design requirement.
The chemical composition (wt%) of steel in the six kinds of specific embodiments of the invention of table 1
Embodiment C Si Mn P S Als Nb Ti N
1 0.07 0.05 1.6 0.008 0.008 0.052 0.065 0.006 0.001
2 0.075 0.08 1.5 0.015 0.001 0.02 0.055 0.009 0.001
3 0.083 0.05 1.53 0.003 0.003 0.068 0.048 0.003 0.003
4 0.09 0.07 1.65 0.01 0.005 0.07 0.06 0.004 0.002
5 0.071 0.08 1.62 0.007 0.01 0.042 0.045 0.008 0.004
6 0.08 0.07 1.57 0.002 0.004 0.033 0.056 0.005 0.003
The mechanical property of the six kinds of specific embodiment products obtained therefroms of the invention of table 2

Claims (5)

  1. A kind of 1. 610MPa levels steel for automobile crossbeam, it is characterised in that:By weight percentage, each chemical constituent is in steel:Carbon: 0.07%~0.09%;Silicon<0.10%;Manganese:1.50%~1.65%;Phosphorus≤0.015%;Sulphur≤0.010%;It is dissolved aluminium: 0.020%~0.070%;Niobium:0.045~0.065%;Titanium:0.003~0.01%;Nitrogen≤0.004%;Copper≤0.30%;Nickel ≤ 0.30%;Surplus is iron and inevitable impurity.
  2. A kind of 2. manufacture method of 610MPa levels steel for automobile crossbeam, it is characterised in that:The technological process of production of this method is:Iron Water desulfurization → converter smelting → application of vacuum → continuous casting → finishing → heating of plate blank → hot continuous rolling → is cooled down → batched;
    Alloying order is ferro-aluminum → ferromanganese → ferro-niobium in the converter steelmaking process, de- eventually using adding aluminium machine to add aluminum steel to carry out Oxygen, ferrotianium is added in the application of vacuum later stage;
    Hot Strip Rolling heating-up temperature is 1200~1300 DEG C, and roughing outlet temperature is 1040~1140 DEG C, finishing temperature 800 ~860 DEG C;
    Each chemical constituent is carbon by weight percentage in the steel:0.07%~0.09%;Silicon<0.10%;Manganese:1.50%~ 1.65%;Phosphorus≤0.015%;Sulphur≤0.010%;It is dissolved aluminium:0.020%~0.070%;Niobium:0.045~0.065%;Titanium: 0.003~0.01%;Copper≤0.30%;Nickel≤0.30%;Surplus is iron and inevitable impurity.
  3. 3. the manufacture method of 610MPa levels steel for automobile crossbeam according to claim 2, it is characterised in that:
    The coiling temperature of the coiling process is 550~590 DEG C.
  4. 4. the manufacture method of the 610MPa level steel for automobile crossbeam according to Claims 2 or 3, it is characterised in that:
    The type of cooling is leading portion section cooling.
  5. 5. the manufacture method of 610MPa levels steel for automobile crossbeam according to claim 4, it is characterised in that:
    In the leading portion laminar cooling process, 35 DEG C of the water temperature < of cooling water, cooling velocity≤25 DEG C/s.
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CN105950971B (en) * 2016-05-12 2018-03-16 武汉钢铁有限公司 A kind of yield strength >=960MPa levels steel for engineering machinery and production method
CN106086665B (en) * 2016-08-12 2018-08-07 武汉钢铁有限公司 A kind of yield strength 530MPa grades of Hot Rolling Automobile steel plates and production method
CN109023111B (en) * 2018-09-26 2020-04-07 武汉钢铁有限公司 1000 MPa-grade hot-rolled automobile girder steel and manufacturing method thereof
CN110331344B (en) * 2019-07-15 2021-04-06 武汉钢铁有限公司 Automobile girder steel with stable strength performance and Rm of more than or equal to 600MPa and production method thereof
CN113549843A (en) * 2021-07-29 2021-10-26 重庆钢铁股份有限公司 610L automobile beam steel belt and manufacturing and application thereof

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JP2003313640A (en) * 2002-04-25 2003-11-06 Jfe Steel Kk High-strength shape steel superior in hot-dip zinc plating cracking resistance, and manufacturing method therefor
CN101724778B (en) * 2008-10-27 2011-09-14 上海梅山钢铁股份有限公司 Steel for automobile beam and with yield strength more than 500 MPa and manufacturing method thereof
CN101701316B (en) * 2009-11-06 2011-11-16 武汉钢铁(集团)公司 Automobile beam steel with tensile strength of 590MPa and manufacturing method thereof
CN101748329B (en) * 2009-12-24 2012-07-04 马鞍山钢铁股份有限公司 610MPa automobile girder steel and production method thereof
JP6064320B2 (en) * 2012-01-04 2017-01-25 Jfeスチール株式会社 Low yield ratio high strength steel plate with excellent ductile fracture resistance
CN103866190B (en) * 2014-03-31 2016-07-13 武汉钢铁(集团)公司 Low fragility 650MPa level steel for automobile crossbeam and manufacture method thereof

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