CN103343287B - Traction base of semitrailer hot-rolled steel and production method thereof - Google Patents
Traction base of semitrailer hot-rolled steel and production method thereof Download PDFInfo
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Abstract
The invention discloses a kind of traction base of semitrailer hot-rolled steel, the weight percent of its chemical composition and each composition is: C:0.05 ~ 0.09%, Si:0.10 ~ 0.25%, Mn:1.70 ~ 1.90%, P :≤0.020%, S :≤0.008%, Als:0.020 ~ 0.060%, Ti:0.10 ~ 0.13%, Nb:0.050 ~ 0.080%, surplus is Fe and inevitable impurity.The invention also discloses a kind of production method of traction base of semitrailer hot-rolled steel.The present invention compared with prior art, except having lower yield strength ReL >=650Mpa, tensile strength Rm reaches 700 ~ 880MPa, outside the intensity of Rm average between 790 ~ 810MPa ensures, elongation A >=16%, at least improve 30% than existing same level strength steel, surface hardness HV10 reaches more than 220, generally remain between 250 ~ 280, at least improve 20% than existing same level strength steel; The plate shape of material is easy to control, and surface quality is high, meets making and the service requirements of traction base of semitrailer completely.<!--1-->
Description
Technical field
The present invention relates to mechanical engineering special steel, be specifically related to a kind of traction base of semitrailer hot-rolled steel and production method thereof.
Background technology
In recent years along with the development of automotive light weight technology, high-strength steel iron material is with the feature of its " high-strength thinning ", and that applies in special-purpose vehicle field is more and more extensive.Along with the development of highway transport industry, China's semitrailer output increases year by year, and as the traction seat of core part, steel also upgrade to high strength special-purpose steel by low alloy steel such as Q345.Traction base of semitrailer hot-rolled steel requires while having high strength, also has higher unit elongation, possesses higher wear resisting property simultaneously.There is unit elongation and the poor defect of wear resisting property in current of home make like product.
Application number be KR19950068444 patent document discloses a kind of high tensile hot rolled steel sheet manufacture method with excellent unit elongation, for parts and the wheel of vehicle.Its component content is: C is 0.06 ~ 0.10%, Si≤0.25%, and Mn is 1.4 ~ 2.0%, P≤0.02%, S≤0.01%, and Al is 0.005 ~ 0.05%, Ti, and to be 0.05 ~ 0.15%, Nb be 0.02 ~ 0.04%, surplus Fe and inevitable impurity.Its production technique is: higher than hot rolling during Ar3 transformation temperature, and water-cooled starts temperature to ferrite transformation, and air cooling ferritic transformation reaches 70 ~ 80% at such a temperature, coiling temperature scope 400 ~ 500 degree.From actual effect, still there is the defects such as wear resisting property is poor in this invention, can not meet the requirement of traction base of semitrailer hot-rolled steel.
Summary of the invention
The object of the invention is to solve intensity that current used traction base of semitrailer hot-rolled steel exists and the poor defect of wear resistance, there is provided a kind of lower yield strength >=650MPa, tensile strength at 700 ~ 880MPa, unit elongation reaches A >=16%, wear resisting property can arrive the traction base of semitrailer hot-rolled steel of surface hardness HV10 >=220, thus extends the life cycle of traction base of semitrailer.The present invention also provides a kind of production method of traction base of semitrailer hot-rolled steel.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of traction base of semitrailer hot-rolled steel, the weight percent of its chemical composition and each composition is: C:0.05 ~ 0.09%, Si:0.10 ~ 0.25%, Mn:1.70 ~ 1.90%, P :≤0.020%, S :≤0.008%, Als:0.020 ~ 0.060%, Ti:0.10 ~ 0.13%, Nb:0.050 ~ 0.080%, surplus is Fe and inevitable impurity.
Produce a method for described traction base of semitrailer hot-rolled steel, comprise the following steps:
1) converter smelting is carried out;
2) process in LF stove, and add Si-Ca line second according to 0.55 ~ 0.65Kg/ ton steel, adding speed is 250 ~ 300m/min;
3) continuous casting becomes base and heats strand, and slab heating temperature controls at 1250 ~ 1290 DEG C;
4) carry out segmentation rolling: control roughing end temp at 1060 ~ 1110 DEG C, control finish rolling finishing temperature at 830 ~ 870 DEG C;
5) cooling speed change cooling is adopted to carry out section cooling: to be first 35 ~ 55 DEG C/sec according to speed of cooling and to cool, when being 650 ~ 700 DEG C when being cooled to temperature, be 10 ~ 15 DEG C/sec according to speed of cooling again to cool, be cooled to 530 ~ 580 DEG C, and controlled cooling model water water temperature is at 10 ~ 35 DEG C;
6) batch, control coiling temperature at 530 ~ 580 DEG C;
7) finishing and rear operation is carried out.
Preferably, slab heating temperature controls at 1270 ~ 1290 DEG C.
Preferably, roughing end temp is controlled at 1080 ~ 1100 DEG C.
Preferably, finish rolling finishing temperature is controlled at 840 ~ 860 DEG C.
The effect of each component and the reason of main technique control in the present invention:
Carbon: carbon is cheap solution strengthening element.According to the range of application of this steel grade, be mainly used in processing the parts such as the traction seat saddle plate of semitrailer and bearing, require that material is while having high strength, have good unit elongation and wear resisting property.If its content is less than 0.05%, then can not meet the requirement of the strength of materials and wear resistance; If its content is greater than 0.09%, then can not meet the processability of material.So, its content is limited to 0.05 ~ 0.09% scope.
Silicon: silicon is cheap and effective steel liquid deoxidation element.Add the silicon of 0.10% to maintain strength of parent, carrying out pre-deoxidation and add, if its content is more than 0.25%, then can worsen surface quality and the welding property of hot-rolled steel sheet, so, its content is limited to 0.10 ~ 0.25% scope.
Manganese: manganese improves intensity and the most effective element of toughness.If its content is less than 1.70%, then can not meet the strength of materials and wear resistance requirement; But add the manganese of volume, the hardening capacity increasing steel can be caused, owing to welding the appearance of hardened layer, crack sensitivity is increased, Given this, it will be defined as 1.90%, so, its content is limited to 1.70 ~ 1.90% scopes.
Phosphorus: in order to avoid the welding property of material, stamping formabilily, toughness, suitability for secondary processing worsen, setting its upper content limit is 0.020%.So its content is controlled below 0.020%.
Sulphur: sulphur is the element be harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and the impelling strength of this sulfide inclusion to steel is very disadvantageous, and causes the anisotropy of performance, therefore, sulphur content in steel need be controlled more low better.Based on the consideration to Steel Sheet technique and manufacturing cost, plan sulphur content in steel and control below 0.008%.
Aluminium: aluminium adds in order to deoxidation, when Als is containing quantity not sufficient 0.020%, can not play its effect; On the other hand, the aluminium owing to adding volume easily forms aluminum oxide agglomerate, so the regulation Als upper limit is 0.060%.Therefore, Als content is limited to 0.020 ~ 0.060% scope.
Titanium: titanium can crystal grain thinning and improve the strength and toughness of steel, and favourable to welding property, and the titanium nitride generated in steel has preventing effectiveness to the AUSTENITE GRAIN COARSENING produced during welding heating.When it is containing quantity not sufficient 0.10%, can not enough plays its strengthening effect, not reach requirement of strength; On the other hand, when the titanium added is more than 0.13%, then can causes toughness deteriorate owing to generating superfluous titanium carbide, according to mechanical property target call, its titanium content is limited to 0.10 ~ 0.13% scope.
Niobium: niobium improves the intensity of steel mainly through crystal grain thinning and precipitation hardening, be strong carbon, nitrogen compound forming element, mainly exist with Nb (C, N) form in steel, stop growing up of austenite crystal, ferrite grain size is finally made to diminish, thinning microstructure.When its content lower than 0.050% time, the requirement of material high strength can not be met; And the niobium added higher than 0.080% time, cost of alloy can significantly rise and toughness deteriorate.So, according to mechanical property target call, its content is limited to 0.050 ~ 0.080% scope.
Except having done the scope of above chemical composition to limit, from the view point of raising weldability, economy, the present invention has not added the expensive alloying elements such as Cu, Ni, Cr, Mo.
About carrying out segmentation rolling, and control roughing end temp at 1060 ~ 1110 DEG C, control finish rolling finishing temperature is also key point of the present invention the operation of 830 ~ 870 DEG C, and preferred roughing end temp is at 1080 ~ 1100 DEG C, and preferred finish rolling finishing temperature is at 840 ~ 860 DEG C.If this is because roughing end temp is lower than 1060 DEG C, then cannot ensure that finish rolling finishing temperature reaches set(ting)value, increase required power; As higher than 1110 DEG C, then can be rolled in the two-phase region of material, cause the defects such as mixed crystal.
The present invention adopts cooling speed change cooling to carry out section cooling, namely be first 35 ~ 55 DEG C/sec according to speed of cooling to cool, being to also not start to cool in time when growing up at the recrystal grain of material, avoiding producing thick tissue, making material obtain tiny metallographic structure; When being 650 ~ 700 DEG C when being cooled to temperature, be 10 ~ 15 DEG C/sec according to speed of cooling again to cool, be cooled to 530 ~ 580 DEG C, be conducive to the metallographic structure of uniform and delicate by the time like this, the tissues such as carbide are made even dispersion to be distributed in base steel, ensure that material is obtaining high mechanical property simultaneously, possesses higher unit elongation and wear resisting property.
The present invention compared with prior art, except having lower yield strength ReL >=650Mpa, tensile strength Rm reaches 700 ~ 880MPa, outside the intensity of Rm average between 790 ~ 810MPa ensures, elongation A >=16%, at least improve 30% than existing same level strength steel, surface hardness HV10 reaches more than 220, generally remain between 250 ~ 280, at least improve 20% than existing same level strength steel; The plate shape of material is easy to control, and surface quality is high, meets making and the service requirements of traction base of semitrailer completely.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of traction base of semitrailer hot-rolled steel of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
The chemical composition of embodiment 1 ~ 8 and comparative example 1 ~ 2 and the weight percent of each composition are in table 1;
The main technologic parameters of embodiment 1 ~ 8 and comparative example 1 ~ 2 is in table 2;
The performance test results of embodiment 1 ~ 8 and comparative example 1 ~ 2 is in table 3.
Production stage in various embodiments of the present invention is:
1) converter smelting is carried out;
2) process in LF stove, and add Si-Ca line second according to 0.55 ~ 0.65Kg/ ton steel, adding speed is 250 ~ 300m/min;
3) continuous casting becomes base and heats strand, and slab heating temperature controls at 1250 ~ 1290 DEG C;
4) carry out segmentation rolling: control roughing end temp at 1060 ~ 1110 DEG C, control finish rolling finishing temperature at 830 ~ 870 DEG C;
5) cooling speed change cooling is adopted to carry out section cooling: to be first 35 ~ 55 DEG C/sec according to speed of cooling and to cool, when being 650 ~ 700 DEG C when being cooled to temperature, be 10 ~ 15 DEG C/sec according to speed of cooling again to cool, be cooled to 530 ~ 580 DEG C, and controlled cooling model water water temperature is at 10 ~ 35 DEG C;
6) batch, control coiling temperature at 530 ~ 580 DEG C;
7) finishing and rear operation is carried out.
The value list of table 1 various embodiments of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Table 3 various embodiments of the present invention and comparative example mechanical properties test the results list
| Embodiment | ReL（MPa） | Rm（MPa） | Surface hardness (HV10) | Unit elongation (A/%) |
| 1 | 694 | 785 | 257 | 24 |
| 2 | 665 | 794 | 263 | 24 |
| 3 | 681 | 789 | 267 | 23 |
| 4 | 691 | 785 | 265 | 23 |
| 5 | 733 | 793 | 275 | 23 |
| 6 | 673 | 779 | 267 | 21 |
| 7 | 680 | 791 | 263 | 21 |
| 8 | 729 | 795 | 270 | 21 |
| Contrast 1 | 663 | 765 | 229 | 16 |
| Contrast 2 | 661 | 769 | 227 | 17 |
As can be seen from Table 3, the present invention is ensureing that the intensity of steel reaches outside technical requirements, also keep higher unit elongation, at least 20% is improve than the unit elongation of compared steel, also assures that steel have higher surface hardness simultaneously, ensure that its wear resisting property is excellent, at least improve 20% than the wear resisting property of compared steel.
Claims (1)
1. produce a method for traction base of semitrailer hot-rolled steel, it is characterized in that comprising the following steps:
1) converter smelting is carried out;
2) process in LF stove, and add Si-Ca line second according to 0.618Kg/ ton steel, adding speed is 270m/min;
3) continuous casting becomes base and heats strand, and slab heating temperature controls at 1278 DEG C;
4) carry out segmentation rolling: control roughing end temp at 1088 DEG C, control finish rolling finishing temperature at 857 DEG C;
5) cooling speed change cooling is adopted to carry out section cooling: to be first 49 DEG C/sec according to speed of cooling and to cool, when being 681 DEG C when being cooled to temperature, be 15 DEG C/sec according to speed of cooling again to cool, be cooled to 571 DEG C, and controlled cooling model water water temperature is at 10 ~ 35 DEG C;
6) batch, control coiling temperature at 562 DEG C;
7) finishing and rear operation is carried out,
The weight percent of described traction base of semitrailer hot-rolled steel chemical composition and each composition is: C:0.07%, Si:0.177%, Mn:1.789%, P:0.012%, S:0.005%, Als:0.046%, Ti:0.106%, Nb:0.063%, surplus is Fe and inevitable impurity.
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| CN106834948A (en) * | 2017-03-03 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | Longitudinal yield strength 700MPa grades of hot rolled strip and preparation method thereof |
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Effective date of registration: 20170721 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |