CN103484763B - It is applicable to automobile shafts tube steel and the production method thereof of high frequency induction welding - Google Patents

It is applicable to automobile shafts tube steel and the production method thereof of high frequency induction welding Download PDF

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CN103484763B
CN103484763B CN201310412944.5A CN201310412944A CN103484763B CN 103484763 B CN103484763 B CN 103484763B CN 201310412944 A CN201310412944 A CN 201310412944A CN 103484763 B CN103484763 B CN 103484763B
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temperature
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high frequency
frequency induction
steel
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CN103484763A (en
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潘辉
朱国森
周娜
李飞
王伦
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Shougang Corp
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Shougang Corp
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Abstract

The invention discloses a kind of automobile shafts tube steel being applicable to high frequency induction welding, C:0.07~0.09%;Si :≤0.04%;Mn:1.7~1.9%;Ti:0.08~0.12%;Al:0.01~0.06%;P :≤0.02%;S :≤0.01%;N :≤0.008%;Remaining is Fe and inevitable impurity.The invention also discloses a kind of method producing the above-mentioned automobile shafts tube steel being applicable to high frequency induction welding, a kind of automobile shafts tube steel being applicable to high frequency induction welding of present invention offer and production method thereof, use the design of low cost composition, in conjunction with smelting, rolling, the process parameter optimizings such as curling, give full play to refined crystalline strengthening, the strengthening effect such as precipitation strength, produce 750MPa~the 850MPa effective hot-strip of level automobile shafts, there is good elongation percentage, intensity is up to 750MPa~880MPa, elongation percentage is more than 18%, clod wash and welding performance are excellent, it is applicable to HFI welding and tubulation moulding process.

Description

It is applicable to automobile shafts tube steel and the production method thereof of high frequency induction welding
Technical field
The present invention relates to vehicle steel production technical field, particularly to a kind of vapour being applicable to high frequency induction welding Axletree tube steel and production method thereof.
Background technology
The lightweight of automobile, it is simply that on the premise of the intensity ensureing automobile and security performance, drop as much as possible The kerb weight of low automobile, thus improve the dynamic property of automobile, reduce fuel consumption, reduce exhaust pollution. Make a general survey of the present situations such as China's energy shortage, road overload and conevying efficiency are low, due to environmental protection and energy-conservation needs, Automotive light weight technology the most not only becomes the task of top priority of Domestic Automotive Industry development, also becomes world car development Trend.Particularly in heavy truck and special-purpose vehicle, semitrailer industry, the material of application higher intensity can significantly subtract Light complete vehicle weight, improves load, improves the service life of vehicle, has the advantage that raising to logistics company Conevying efficiency, is greatly reduced logistics cost, and energy-saving and emission-reduction social benefit is notable.
For automobile shafts tube steel, the commonly used intensity of prior art less than 550MPa traditional axle tube steel or Seamless steel pipe.In order to adapt to the requirement of automotive light weight technology, and improve fatigue strength and the torque resistant performance of material, Some high strength steel iron materials start to be applied on automobile central siphon.Number of patent application 200910185786.8 In describe a kind of high-strength semi-trailer shaft tube and production method, the alloying component of steel pipe and content percentage Ratio is: C:0.23~0.28, Si:0.15~0.30, Mn:1.30~1.45, P≤0.030, S≤0.035, Al≤0.01, Cu≤0.025, Ni≤0.25, Cr≤0.25, Mo≤0.15, surplus is ferrum;Production technology is raw material Through steel billet processed, perforation, tube rolling and hot size.
At present in terms of the raw material and production technology thereof of automobile shafts tube steel, existing production technology has following several Aspect is not enough:
(1) space that intensity rank is still improved, the tensile strength high-strength material more than 750MPa is same It is applicable to manufacture automobile central siphon, and there is higher fatigue strength and torque resistant performance.
(2) the automobile central siphon that HFI welding mode produces, flattens and expanding performance has much room for improvement, it is desirable to Material has good plastic deformation ability while high intensity, and this just requires to improve material elongation percentage and control The yield tensile ratio of prepared material.
Summary of the invention
The technical problem to be solved be to provide a kind of can improve existing automobile shafts tube steel intensity, Torque resistant performance, fatigue behaviour and elongation percentage, can also reduce the suitable of existing automobile shafts tube steel yield tensile ratio simultaneously Automobile shafts tube steel and production method thereof for high frequency induction welding.
One aspect of the present invention, it is provided that a kind of automobile shafts tube steel being applicable to high frequency induction welding, C: 0.07~0.09%;Si :≤0.04%;Mn:1.7~1.9%;Ti:0.08~0.12%;Al:0.01~0.06%; P :≤0.02%;S :≤0.01%;N :≤0.008%;Remaining is Fe and inevitable impurity.
Another aspect of the present invention, it is provided that a kind of produce the above-mentioned automobile central siphon being applicable to high frequency induction welding By the method for steel, including:
Molten iron is obtained half molten steel through converter or electric furnace smelting;
After half molten steel is passed through LF refine or RH application of vacuum, carry out continuous casting and obtain slab;
Being heated by described slab, heating and temperature control is at 1260~1300 DEG C, and temperature retention time is more than 180 Minute, then will heating after slab through roughing, finish rolling obtain hot rolled plate, entry temperature at finishing be 1050 DEG C~ 1100 DEG C, finishing temperature is 860~900 DEG C, then described hot rolled plate is carried out section cooling, rolls up after cooling Take into finished product.
Further, described hot rolled plate uses leading portion refrigerating mode to carry out section cooling, and target coiling temperature is 610 DEG C~640 DEG C.
Further, the chemical composition of described slab is by weight percentage: C:0.07~0.09%;Si :≤ 0.04%;Mn:1.7~1.9%;Ti:0.08~0.12%;Al:0.01~0.06%;P :≤0.02%;S: ≤0.01%;N :≤0.008%;Remaining is Fe and inevitable impurity.
A kind of automobile shafts tube steel being applicable to high frequency induction welding of present invention offer and production method thereof, use Low cost composition designs, in conjunction with smelting, roll, the process parameter optimizing such as curling, give full play to refined crystalline strengthening, The strengthening effect such as precipitation strength, produces 750MPa~the 850MPa effective hot-strip of level automobile shafts, has Good elongation percentage, intensity is more than 18% up to 750MPa~880MPa, elongation percentage, clod wash and weldability Can be excellent, it is adaptable to HFI welding and tubulation moulding process, can be used for producing automobile central siphon, the most in fact Now material thickness is thinning, can effectively realize lightweight on the premise of ensureing vehicle safety, has alloy This is low, the feature that rolling process is easily achieved.
Detailed description of the invention
A kind of automobile shafts tube steel being applicable to high frequency induction welding that the embodiment of the present invention provides, its chemical composition It is by weight percentage: C:0.07~0.09%;Si :≤0.04%;Mn:1.7~1.9%;Ti:0.08~ 0.12%;Al:0.01~0.06%;P :≤0.02%;S :≤0.01%;N :≤0.008%;Remaining be Fe and inevitable impurity.
A kind of side producing the above-mentioned automobile shafts tube steel being applicable to high frequency induction welding that the embodiment of the present invention provides Method, specifically includes following steps:
Step S1: molten iron is obtained half molten steel through converter or electric furnace smelting;
Step S2: after half molten steel is passed through LF refine or RH application of vacuum, carries out continuous casting and obtains slab, plate The chemical composition of base is by weight percentage: C:0.07~0.09%;Si :≤0.04%;Mn:1.7~1.9%; Ti:0.08~0.12%;Al:0.01~0.06%;P :≤0.02%;S :≤0.01%;N :≤0.008%; Remaining is Fe and inevitable impurity.
Step S3, described slab is heated, then obtain hot rolled plate, then by institute through roughing, finish rolling State hot rolled plate and carry out section cooling, after cooling, coil into hot rolled coil.
Wherein, slab is heated by step S3, then obtains hot rolled plate, then by heat through roughing, finish rolling Roll plate and carry out section cooling, coil into hot rolled coil after cooling and comprise the following steps:
Step S31, being heated by slab, heating-up temperature is 1260~1300 DEG C;
Step S32: by slab through fixed-width pressure machine obtain required for width of plate slab, again through two roller roughing, Four roller roughing obtain intermediate blank.
Step S33: enable thermal insulation cover between roughing and finish rolling, it is ensured that the uniformity of intermediate blank temperature, insulation Time controls at 180 minutes more than temperature retention time.
Step S34: intermediate blank is obtained hot rolled plate through mm finishing mill unit.Entry temperature at finishing controls 1050 DEG C~1100 DEG C, finishing temperature control is at 860~900 DEG C;.
Step S35: hot rolled plate is coiled into hot rolled coil by coiling machine after section cooling.Section cooling uses Leading portion refrigerating mode, target coiling temperature is 610 DEG C~640 DEG C.
Main alloy element effect of the present invention and the scope of restriction are as follows:
Carbon: carbon is to improve the most economical effective element of the strength of materials, is also element needed for TiC precipitation strength, But C content is too high is easily caused plasticity and solderability decline.For producing automobile shafts tube steel, it is contemplated that user Molding mode is high frequency induction welding, and the carbon content set point that the present invention uses is 0.07%~0.09%.
Silicon: silicon is solution strengthening element, but add too high silicon and the plasticity of material can be had a negative impact, with Time reduce Si and be of value to and avoid the occurrence of surface red scale, due to partial automobile factory in central siphon uses also Do not carry out surface process, therefore should ensure that former surface of steel plate non-oxidation iron sheet.Therefore, the present invention adds silicon and contains Amount is for≤0.04%.
Manganese: manganese has solution strengthening effect, can improve material quenching degree simultaneously, is that the raising strength of materials is important One of element, but Fe content adds too high easy generation segregation and can reduce toughness of material, deteriorates performance.Right Should ensure that in automobile shafts tube steel and occur without serious center segregation, it is to avoid follow-up use is ftractureed, therefore by Mn The upper limit is set as 1.9%, and it is 1.70%~1.90% that the present invention adds Fe content.
Sulfur and phosphorus: toughness of material and plasticity are adversely affected by sulfur and the too high meeting of P elements.Present invention defines Sulfur content should control within 0.01%, and phosphorus content should control within 0.02%.
Aluminum: aluminum is deoxidant element, has certain grain refining effect simultaneously.Present invention defines aluminum content It is 0.01%~0.06%.
Titanium: the precipitating reinforcing effect making full use of Ti improves intensity.The present invention adds 0.08%~0.12% Ti coordinates suitable production technology, obtains the precipitate of the TiC of a large amount of small and dispersed distribution, is keeping material While there are good plasticity and toughness, intensity level is greatly improved.But precipitation strength is to material yield strength Contribution is more than tensile strength, it is easy to make the yield tensile ratio of steel increase, and therefore, this patent limits the upper limit of Ti and do not surpasses Cross 0.12%.
Nitrogen: the plasticity of nitrogen content too high meeting severe exacerbation material and toughness is high especially for Ti microalloying Qiang Gang, is at high temperature combined the TiN producing large-size, affects toughness and the fatigue of material due to N with Ti Performance.Therefore, the present invention limits nitrogen content and should be less than 0.008%.
Present invention employs a kind of low-alloy cost ingredients system: relatively low carbon and manganese content, without Nb, The expensive alloying elements such as Mo, Ni, Cu, Cr, make full use of the precipitating reinforcing effect of Ti, in conjunction with suitably Cooling controlling and rolling controlling process obtains ferrite crystal grain tiny, uniform, so that material has good obdurability Coupling, the component system carbon equivalent that the present invention uses all controls within 0.40, and cooling cracks the susceptible index number controls Within 0.20%, material has good welding performance, it is adaptable to the high frequency induction welding of central siphon manufacture process.
The controlling of production process main points that the present invention uses are that smelting process strictly controls P, S, N content, protect Card slab quality.The operation of rolling strictly controls each controlled rolling and cooling process parameter.
The heating-up temperature that the present invention uses is 1260 DEG C~1300 DEG C, and temperature retention time is more than 180 minutes, uses The purpose of higher heating-up temperature is to ensure the Ti of formation in austenite homogenization and alloying element such as strand Compound dissolution more abundant;The correlation test of the present invention shows, when heating-up temperature is less than 1250 DEG C, TiC can not back dissolving completely, reduce the intensity of final material;
Employing two-stage control rolls, and finishing stands need to strictly control finish rolling entrance temperature according to finished product thickness specification Degree is 1050 DEG C~1100 DEG C, and finishing temperature is 860~900 DEG C;Higher rolling temperature is conducive to obtaining good Good online plate shape, the raising of rolling temperature simultaneously, the anisotropic of hot-continuous-rolling strip steel will be reduced, reduce material The transverse and longitudinal performance difference of material.
Steel band uses leading portion refrigerating mode to carry out section cooling after going out finish rolling, after being on the one hand conducive to strengthening phase transformation Build up, on the other hand be conducive to strengthening precipitating reinforcing effect, obtain the tiny analysis in more ferrite Go out product, thus be effectively improved the strength of materials.The target coiling temperature that the present invention uses is 610 DEG C~640 DEG C, Using higher coiling temperature is to obtain good yield strength and the key of tensile strength coupling, is conducive to controlling The yield tensile ratio of material is less than 0.90%.
A kind of automobile shafts tube steel being applicable to high frequency induction welding of embodiment of the present invention offer and producer thereof Method, uses the design of low cost composition, in conjunction with smelting, roll, the process parameter optimizing such as curling, gives full play to The strengthening effect such as refined crystalline strengthening, precipitation strength, produces 750MPa~the 850MPa effective hot rolling of level automobile shafts Strip steel, has good elongation percentage, and intensity is up to 750MPa~880MPa, and elongation percentage is more than 18%, cold Curved excellent with welding performance, it is adaptable to HFI welding and tubulation moulding process, can be used for producing automobile shafts Pipe, effectively realizes the thinning of material thickness, can effectively realize lightweight on the premise of ensureing vehicle safety, There is cost of alloy low, the feature that rolling process is easily achieved.
Below in conjunction with embodiment, the present invention is further detailed explanation:
The embodiment of the present invention uses 220 tons of converter smeltings, and 1580 hot continuous rolling production lines roll.
Embodiment 1:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, and its percentage by weight is C: 0.07%, Si:0.03%, Mn:1.75%, P:0.012%, S:0.003%, Al:0.041%, Ti: 0.09%, N:0.004%, remaining is Fe and inevitable impurity.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1260 DEG C, and entry temperature at finishing is 1060 DEG C, finishing temperature is 860 DEG C, and target thickness is 6mm, is cooled to target through section cooling and batches after rolling Temperature 640 DEG C, batches rear air cooling to room temperature.
High-strength steel yield strength Rel produced according to above method is 670MPa, and tensile strength is 750MPa, Elongation percentage is 22%, clod wash D=1.5a surface flawless.
Embodiment 2:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, and its percentage by weight is C: 0.075%, Si:0.001%, Mn:1.80%, P:0.002%, S:0.001%, Al:0.041%, Ti: 0.10%, N:0.004%, remaining is Fe and inevitable impurity.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1270 DEG C, and entry temperature at finishing is 1070 DEG C, finishing temperature is 880 DEG C, and target thickness is 5mm, is cooled to target through section cooling and batches after rolling Temperature 620 DEG C, batches rear air cooling to room temperature.
High-strength steel yield strength Rel produced according to above method is 715MPa, and tensile strength is 800MPa, Elongation percentage is 20%, clod wash D=1.5a surface flawless.
Embodiment 3:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, and its percentage by weight is C: 0.082%, Si:0.0003%, Mn:1.82%, P:0.0025%, S:0.0013%, Al:0.051%, Ti:0.085%, N:0.0004%, remaining is Fe and inevitable impurity.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1290 DEG C, and entry temperature at finishing is 1080 DEG C, finishing temperature is 890 DEG C, and target thickness is 4mm, is cooled to target through section cooling and batches after rolling Temperature 610 DEG C, batches rear air cooling to room temperature.
High-strength steel yield strength Rel produced according to above method is 725MPa, and tensile strength is 810MPa, Elongation percentage is 20%, clod wash D=1.5a surface flawless.
Embodiment 4:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, and its percentage by weight is C: 0.09%, Si:0.04%, Mn:1.85%, P:0.013%, S:0.002%, Al:0.044%, Ti: 0.11%, N:0.004%, remaining is Fe and inevitable impurity.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1265 DEG C, and entry temperature at finishing is 1065 DEG C, finishing temperature is 865 DEG C, and target thickness is 6mm, is cooled to target through section cooling and batches after rolling Temperature 640 DEG C.
High-strength steel yield strength Rel produced according to above method is 715MPa, and tensile strength is 795MPa, Elongation percentage is 22%, clod wash D=1.5a surface flawless.
Embodiment 5:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, its percentage by weight and reality Execute example 4 identical.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1270 DEG C, and entry temperature at finishing is 1070 DEG C, finishing temperature is 870 DEG C, and target thickness is 5mm, is cooled to target through section cooling and batches after rolling Temperature 630 DEG C.
High-strength steel yield strength Rel produced according to above method is 745MPa, and tensile strength is 830MPa, Elongation percentage is 21.5%, clod wash D=1.5a surface flawless.
Embodiment 6:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, its percentage by weight and reality Execute example 4 identical.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1290 DEG C, and entry temperature at finishing is 1090 DEG C, finishing temperature is 895 DEG C, and target thickness is 4mm, is cooled to target through section cooling and batches after rolling Temperature 620 DEG C.
High-strength steel yield strength Rel produced according to above method is 760MPa, and tensile strength is 850MPa, Elongation percentage is 21%, clod wash D=1.5a surface flawless.
Embodiment 7:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, and its percentage by weight is C: 0.085%, Si:0.03%, Mn:1.80%, P:0.013%, S:0.002%, Al:0.044%, Ti: 0.10%, N:0.004%, remaining is Fe and inevitable impurity.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1280 DEG C, and entry temperature at finishing is 1075 DEG C, finishing temperature is 860 DEG C, and target thickness is 7mm, is cooled to target through section cooling and batches after rolling Temperature 630 DEG C.
High-strength steel yield strength Rel produced according to above method is 700MPa, and tensile strength is 780MPa, Elongation percentage is 21%, clod wash D=1.5a surface flawless.
Embodiment 8:
Smelting in 220 tons of converters the molten steel through external refining are casting continuously to form strand, its percentage by weight and reality Execute example 7 identical.Slab thickness is 230mm.
Rolling at 1580 hot continuous rolling production lines, heating-up temperature is 1300 DEG C, and entry temperature at finishing is 1100 DEG C, finishing temperature is 900 DEG C, and target thickness is 3mm, is cooled to target through section cooling and batches after rolling Temperature 620 DEG C.
High-strength steel yield strength Rel produced according to above method is 755MPa, and tensile strength is 845MPa, Elongation percentage is 20%, clod wash D=1.5a surface flawless.
It should be noted last that, above detailed description of the invention only in order to technical scheme to be described rather than Limiting, although being described in detail the present invention with reference to example, those of ordinary skill in the art should manage Solve, technical scheme can be modified or equivalent, without deviating from the technology of the present invention side The spirit and scope of case, it all should be contained in the middle of scope of the presently claimed invention.

Claims (2)

1. a production is applicable to the method for automobile shafts tube steel of high frequency induction welding, it is characterised in that including:
Molten iron is obtained half molten steel through converter or electric furnace smelting;
After half molten steel is passed through LF refine or RH application of vacuum, carry out continuous casting and obtain slab, described slab Chemical composition is by weight percentage: C:0.07~0.09%;Si :≤0.04%;Mn:1.7~1.9%;Ti: 0.08~0.12%;Al:0.01~0.06%;P :≤0.02%;S :≤0.01%;N :≤0.008%;Its Remaining is Fe and inevitable impurity;
Being heated by described slab, heating and temperature control is at 1260~1300 DEG C, and temperature retention time is more than 180 Minute, then will heating after slab through roughing, finish rolling obtain hot rolled plate, entry temperature at finishing be 1060 DEG C~ 1100 DEG C, finishing temperature is 860~900 DEG C, then described hot rolled plate is carried out section cooling, rolls up after cooling Take into finished product.
2. the method producing the automobile shafts tube steel being applicable to high frequency induction welding as claimed in claim 1, its It is characterised by:
Described hot rolled plate use leading portion refrigerating mode carry out section cooling, target coiling temperature be 610 DEG C~ 640℃。
CN201310412944.5A 2013-09-11 It is applicable to automobile shafts tube steel and the production method thereof of high frequency induction welding Active CN103484763B (en)

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Application Number Priority Date Filing Date Title
CN201310412944.5A CN103484763B (en) 2013-09-11 It is applicable to automobile shafts tube steel and the production method thereof of high frequency induction welding

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CN103484763B true CN103484763B (en) 2016-11-30

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101624676A (en) * 2009-07-15 2010-01-13 东北大学 Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof
CN102363858A (en) * 2011-11-03 2012-02-29 首钢总公司 High-strength steel for 750 to 880 MPa-level vehicles and production method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101624676A (en) * 2009-07-15 2010-01-13 东北大学 Hot-rolled beam steel with a tensile strength of more than 710MPa and preparation method thereof
CN102363858A (en) * 2011-11-03 2012-02-29 首钢总公司 High-strength steel for 750 to 880 MPa-level vehicles and production method thereof

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Address after: 100041 Shijingshan Road, Beijing, No. 68, No.

Patentee after: Shougang Group Co. Ltd.

Address before: 100041 Shijingshan Road, Beijing, No. 68, No.

Patentee before: Capital Iron & Steel General Company