CN104611626A - Low-cost high-strength automobile wheel steel and production method thereof - Google Patents
Low-cost high-strength automobile wheel steel and production method thereof Download PDFInfo
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- CN104611626A CN104611626A CN201310540304.2A CN201310540304A CN104611626A CN 104611626 A CN104611626 A CN 104611626A CN 201310540304 A CN201310540304 A CN 201310540304A CN 104611626 A CN104611626 A CN 104611626A
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Abstract
The invention relates to relates to the field of hot continuous rolled plate strips, and especially relates to a low-cost high-strength automobile wheel steel and a production method thereof. A technical problem to be solved is how to guarantee that products accord with all index requirements of the automobile industry and meet users' use requirements on the premise of low cost. A technical scheme is characterized in that the low-cost high-strength automobile wheel steel comprises 0.07-0.1wt% of C, 0.146-0.246wt% of Si, 0.76-0.95wt% of Mn, 0.02wt% or less of P, 0.015wt% or less of S, and the balance of Fe and inevitable inclusion elements. The heated plate blank tapping temperature is 1200-1230DEG C, the tapped sheet blank undergoes high pressure water scale removal at a temperature of 1173DEG C or above, the finishing temperature is 840-870DEG C, and the reeling temperature is 560-590DEG C. The steel can be used to make spokes and wheel rims, and can also used to process and make other structural members of automobiles.
Description
Technical field
The present invention relates to hot-rolling plate band plate field, particularly relate to a kind of low-cost high-strength steel for automobile wheel and production method thereof.
Background technology
The structural performance requirements of development to component of automotive engineering is more and more higher, and wheel is the main security parts of running car, is also the important factor affecting vehicle performance simultaneously.The structure of wheel is divided into two classes: one is be welded into wheel with after the rim shaped steel volume circle be rolled into stamping spoke; Two is the wheel and material for rolling wheel that are welded into wheel rim and the stamping spoke of steel plate roll forming, and it is without the need to the inner tube of a tyre, has the advantages such as the dynamic balance that precision is high, quality is light, good, high fatigue lifetime.Along with the rise of domestic automobile industrial expansion, particularly car industry, the development & application of the steel material for rolling wheel plate that high quality requires is imperative.At present, car, light bus, little tonnage light truck all adopt material for rolling wheel.
Steel wheel manufacturing enterprise of China, compared with American-European advanced production enterprise, the investigation and application of material technology also exists sizable gap.In the decades of development of automobile at home, automobile rim steel is mainly traditional hot-rolled steel section material, and spoke is Q235 mainly.In recent years, domestic steel industry progressively develops the material for rolling wheel special-purpose steel of various series, but cost of alloy is high relatively.
The patent close with the present invention has following 2, Chinese patent: application number: 201010183475.0: " a kind of high-strength steel for automotive wheels and manufacture method thereof " (documents 1) and Chinese patent: application number: 201019000011.9 " a kind of production method of LG380G wheel-use steel material " (documents 2).
Application number: 201010183475.0: " a kind of high-strength steel for automotive wheels and manufacture method thereof " (documents 1), high alloy element M n content and low Si content, during STEELMAKING PRODUCTION, except will consuming higher manganeseirom, for ensureing that steel quality needs with more Al alloy deoxidation, increase production cost; P content needs to control in 0.008 ~ 0.016% scope in addition, too increases the production control difficulty of steel-making.
Application number: 201019000011.9 " a kind of production method of LG380G wheel-use steel material " (documents 2) patent with the addition of microalloy element Nb, Ti, and these alloying elements are expensive, thus production cost is increased.
Above two patents of invention, all adopting the low Si chemical composition design of Si≤0.1%, in order to ensure the over-all properties of product, adding again more alloying element, and cost of alloy increases.
More than comprehensive, the present invention is directed to the situation that current domestic Wheel Steel cost of alloy is higher, adopt reasonable Si, Mn Composition Design, and in conjunction with the comprehensive technological scheme of hot rolling technology, define low-cost high-strength wheel-use steel material production gordian technique, the Wheel Steel tensile property of development reaches more than 440MPa, and mechanical property and service requirements all reach requirement, and cost significantly reduces.Production control easily, simply, cost is low.General hot continuous rolling production line can be implemented.
Summary of the invention
The object of this invention is to provide a kind of low-cost high-strength steel for automobile wheel and production method thereof.The technical issues that need to address of the present invention are: under the prerequisite of low cost, how to ensure that the indices that product meets automobile industry requires and meets the service requirements of user.
Technical scheme of the present invention is: thinking of the present invention is designed by low-cost alloy element, particularly do not add expensive alloying elements, by means of only suitably carrying high Si content, reduce Mn content, by the coupling that hot rolling technology controls, be difficult to be removed, while strip surface presentation is red scale problem at the high production process iron scale caused of solution Si, ensure that strip elongation does not reduce because of the raising of silicone content, the strip that the present invention produces has high strong plasticity and surface quality.
The chemical component weight per-cent following (wt%) of steel of the present invention and comparative steel:
Table 1 chemical composition of the present invention (wt %)
All the other are iron and remaining trace impurity.
In order to reduce production cost, do not add the alloying elements such as Nb, Ti, but adopt lower alloying element Mn, and improve intensity by appropriate more cheap silicon addition, by the reasonable coordination of hot rolling technology, solve Si improve after toughness of products to reduce and in the hot rolling production process that causes, scale on surface difficulty is except problem, the product that the present invention produces has good strength and toughness and surface quality, meets service requirements.The mechanism that the present invention relates to is as follows:
C: improve carbon content, to improve the room temperature strength of steel and medium temperature intensity favourable, but all unfavorable to the plasticity of steel, toughness, formability, weldability.Therefore carbon content control is unsuitable too high.
Si:Si has very strong solution strengthening effect after being dissolved in ferrite, often increases the Si of 0.1% weight percent in carbon steel, and the tensile strength of hot-rolled steel can be made to improve 7.8 ~ 8.8MPa, and yield strength improves 3.9 ~ 4.9MPa.But Si content more than 0.4% after the disadvantageous effect of toughness and surface quality is strengthened.
Mn: improve Fe content in steel, γ district can be expanded, reduce γ → α transition temperature, expand rolling scope, the chance of growing up of ferrite crystal grain is greatly reduced, thus grain refining is facilitated, increase the obdurability of steel, but Fe content is high, the cost of the corresponding increase steel of meeting, also can increase carbon equivalent, be unfavorable for welding.
S: sulphur forms sulfide inclusion in steel, makes its ductility and toughness reduce.During steel rolling, because MnS is mingled with along with rolling direction extends, increase the anisotropy of steel.
P: phosphorus height increases the cold shortness of steel, makes the brittle transition temperature of steel increase, the impelling strength of steel is significantly declined.
The production craft step of steel of the present invention is: desulfurization molten steel, converter smelting, refining, continuous casting, heating of plate blank, de-scaling, roughing mills, finish rolling de-scaling, finishing train, section cooling, batch.
Molten iron is after desulfurization process; enter converter and add steel scrap and carry out smelting (according to working control level; can select whether to adopt refinery practice), adopt the process of Si alloy deoxidation and alloying; add mid-carbon fe-mn Alloying Treatment; after Alloying Treatment completes, molten steel enters argon station refining treatment; Argon stirs more than 5 minutes, purifying of steel, and the molten steel handled well carries out molding casting by continuous caster.Carry out hot rolling production afterwards, first continuous casting steel billet is sent into process furnace to heat, slab tapping temperature after heating: 1200 DEG C ~ 1230 DEG C, slab come out of the stove after more than 1173 DEG C high-pressure water descaling, through roughing mills rolling, finishing train rolling, after then carrying out section cooling, is rolled into coil of strip by reeling machine.Controlled rolling temperature: for obtaining the crystal grain of fine uniform, improves intensity and the plasticity of steel.Finishing temperature is set as 840 DEG C ~ 870 DEG C, coiling temperature 560 DEG C ~ 590 DEG C.
The present invention has the following advantages and effect: adopt reasonable Si, Mn Composition Design, and in conjunction with the comprehensive technological scheme of hot rolling technology, define low-cost high-strength wheel-use steel material production gordian technique, the Wheel Steel tensile property of development reaches more than 440MPa, mechanical property and service requirements all reach requirement, and cost significantly reduces.Production control easily, simply, cost is low.The present invention can meet domestic most steel mill actual production conditions, does not need to change hot rolling line equipment and directly applies.Steel of the present invention, except can making spoke wheel rim, also can be applied in other structural part processing and manufacturing of automobile.
Accompanying drawing explanation
Fig. 1 is comparative example 2 strip scale on surface cross-section morphology figure.
Fig. 2 is comparative example 2 strip matrix and iron scale junction surface characteristic pattern.
Fig. 3 is comparative example 3 strip scale on surface cross-section morphology figure.
Fig. 4 is embodiment 1 strip scale on surface cross-section morphology figure.
Fig. 5 is embodiment 4 strip matrix and iron scale junction surface characteristic pattern.
Fig. 6 is metallographic structure figure of the present invention.
Embodiment
According to scheme provided by the invention and technique, manufacture, chemical composition is in table 2, and processing parameter is in table 3, and object performance result and coiled sheet scale on surface situation are in table 4.Wherein comparative example 1 is patent CN201010183475.0 data, and comparative example 2 is the contrast experiment carried out according to the low Si Composition Design of patent CN201019000011.9.
After implementing according to patent formula of the present invention, strip intensity reaches more than 440MPa, has good strong plasticity energy.Strip scale on surface quality, meets the processing request of further pickling.
The know-why that the present invention relates to:
Steel scale on surface is primarily of FeO, Fe
3o
4and Fe
2o
3composition, near steel matrix layer is the FeO relatively loosened, in pewter.Outwards dense Fe successively
3o
4and Fe
2o
3respectively in black and redness.The color of iron sheet changes with the difference of various oxydised component ratio, works as Fe
2o
3and Fe
2o
3when ratio is higher, show as redness; When FeO is more, show as pewter.
For containing Si steel, when Heating temperature is more than 1173 DEG C of (FeO/Fe
2siO
4eutectic temperature) time, solid-state eutectic thing FeO/Fe
2siO
4change liquid state into, between the unsalted surface and FeO layer of steel, form liquefaction film.When in de-scaling process, temperature drops to 1173 DEG C, start to change solid-state eutectic thing FeO/Fe into
2siO
4, eutectic transformation product FeO/Fe
2siO
4intensity is very high, and the interphase match good with austenitic formation in FeO layer and base steel.In hot rolling production process, controlled oxidization iron sheet structure, namely reduces Fe
2o
3structure, forms more FeO structure, can reduce the difficulty of the further pickling processing of strip.
Although the present invention is by adding the Si of weight percentage 0.146-0.246%, improves the intensity of steel, making full use of the characteristic of scale structure, by suitable tapping temperature, make dephosphorization temperature more than 1173 DEG C, ensure that strip has good surface quality.By analyzing the strip scale on surface of different states, the results are shown in Table 4.
Si is the effectively element of displacement solution strengthening ferrite, steel of the present invention is rolled in austenitic area, finishing temperature is 840 DEG C ~ 870 DEG C, then 560 DEG C ~ 590 DEG C are cooled fast to through section cooling, form tiny ferrite crystal grain, improve the plasticity and toughness of steel, grain size number is 9-10 level, sees Fig. 6; And the Si be solidly soluted in ferrite can affect interaction of dislocation, improve work hardening capacity, be increased in the uniform elongation under given strength level, ensure the good combination of steel toughness and tenacity, the tensile strength of steel of the present invention reaches more than 440MPa, and elongation is more than 35%.
After adopting patent formula of the present invention, strip scale on surface is rendered as pewter, and Thickness Ratio is thinner, and mean thickness 7.7 μm, finds out from the photo of section, and the inner side of iron scale and strip matrix bonding surface are loosely.Adopt the strip that patent formula of the present invention is produced, surface quality is good, suitable with low silicon scenario outcomes.
Table 2 embodiment of the present invention and comparative example alloying constituent (wt %)
The rolling technology system of table 3 embodiment and comparative example
The mechanical property of table 4 embodiment and comparative example and scale on surface situation
Claims (2)
1. a low-cost high-strength steel for automobile wheel, is characterized in that chemical component weight per-cent is as follows: C: 0.07 ~ 0.1%, Si:0.146 ~ 0.246%, Mn:0.76% ~ 0.95%, P≤0.02%, S≤0.015%, surplus is Fe and inevitable tramp element.
2. produce the method for low-cost high-strength steel for automobile wheel described in claim 1 for one kind, comprise the following steps, desulfurization molten steel, converter smelting, refining, continuous casting, heating of plate blank, de-scaling, roughing mills, finish rolling de-scaling, finishing train, section cooling, to batch, it is characterized in that heating rear slab tapping temperature: 1200 DEG C ~ 1230 DEG C, slab come out of the stove after more than 1173 DEG C high-pressure water descaling, finishing temperature is set as 840 DEG C ~ 870 DEG C, coiling temperature 560 DEG C ~ 590 DEG C.
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| CN201310540304.2A CN104611626A (en) | 2013-11-05 | 2013-11-05 | Low-cost high-strength automobile wheel steel and production method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310540304.2A CN104611626A (en) | 2013-11-05 | 2013-11-05 | Low-cost high-strength automobile wheel steel and production method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108342656A (en) * | 2018-03-13 | 2018-07-31 | 朱威威 | A kind of superhigh intensity automobile structural steel and its production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431059A (en) * | 2003-02-09 | 2003-07-23 | 攀枝花钢铁有限责任公司钢铁研究院 | Method for mfg. hot rolled steel plate possessing superfine crystal grains and hot rolled steel plate produced |
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for medium sized or thin plate blank continuous casting and continuous rolling for producing superfine crystal grain steel plate and the steel plate |
| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
-
2013
- 2013-11-05 CN CN201310540304.2A patent/CN104611626A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431059A (en) * | 2003-02-09 | 2003-07-23 | 攀枝花钢铁有限责任公司钢铁研究院 | Method for mfg. hot rolled steel plate possessing superfine crystal grains and hot rolled steel plate produced |
| CN1995431A (en) * | 2006-01-06 | 2007-07-11 | 鞍钢股份有限公司 | Method for medium sized or thin plate blank continuous casting and continuous rolling for producing superfine crystal grain steel plate and the steel plate |
| CN102345050A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Method for producing flaw detection and performance guaranteed Q235B steel plate with 80-100mm in argon station |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108342656A (en) * | 2018-03-13 | 2018-07-31 | 朱威威 | A kind of superhigh intensity automobile structural steel and its production method |
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