CN104195437A - Steel for stirring tank with tensile strength of 590MPa and production method of steel - Google Patents
Steel for stirring tank with tensile strength of 590MPa and production method of steel Download PDFInfo
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- CN104195437A CN104195437A CN201410420787.7A CN201410420787A CN104195437A CN 104195437 A CN104195437 A CN 104195437A CN 201410420787 A CN201410420787 A CN 201410420787A CN 104195437 A CN104195437 A CN 104195437A
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Abstract
The invention provides steel for a stirring tank with the tensile strength of 590MPa and a production method of the steel. The steel comprises the following chemical components in percentage by weight: 0.14-0.18% of C, less than or equal to 0.15% of Si, 1.35-1.55% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.020-0.060% of Als, 0.20-0.33% of Cu, 0.020-0.035% of Nb, 0.030-0.050% of Ti and the balance of Fe and inevitable impurities. The production process adopts an ordinary pure steel process and comprises the following steps: smelting in a converter, refining in an LF furnace, performing continuous casting, heating a cast blank, rolling, performing laminar cooling, coiling and refining. The lower yield strength of the steel is greater than or equal to 500MPa, the tensile strength of the steel is greater than or equal to 590MPa, the elongation rate A of the steel is greater than or equal to 18%, and meanwhile the surface hardness HV10 is greater than 170 (including 170), so that the wearing resistance of the steel for the stirring tank is improved.
Description
Technical field
The present invention relates to steel and production method technical field thereof, specifically refer to a kind of tensile strength 590MPa level stirred pot steel and production method thereof.
Background technology
The whipping appts of concrete drums is made up of tank body and interior blade, and it is one of primary member of truck mixer, is also the core component of performance truck mixer function.The service requirements of automobile stirred pot and complete processing have determined that material therefor need have high strength, excellent wear, non-corrosibility and suitable weldability.Along with development trend and the energy-conservation needs of loss of weight of automotive light weight technology, the tank body of stirred pot and interior blade materials are upgraded to proprietary material by low alloy steel such as Q345 gradually.Domestic each steel mill is all carrying out the research work of related fields.But alloying element used, consumption, which kind of technique are all not quite similar, relevant with equipment of each factory, technology, raw material etc.
Before the present invention, the Chinese invention patent that application number is 201210059346.X, discloses a kind of coal slurry transfer lime hot-rolled steel sheet and manufacture method thereof.Described steel plate comprises following chemical composition (wt%): carbon: 0.05～0.10%; Silicon: 0.20～0.40; Manganese: 1.20～1.7%; Aluminium: 0.015～0.06%; Niobium: 0.03～0.06%; Titanium: 0.010～0.020%; Copper≤0.30%; Nickel≤0.30%; Chromium≤0.50%; Phosphorus≤0.015%; Sulphur≤0.005%; Nitrogen≤0.006%; Vanadium≤0.05%; Boron≤0.0005%; Ceq≤0.41; Pcm≤0.20; All the other are iron and impurity.Described in this application, steel grade is mainly used in the manufacture of coal slurry transfer lime, and in Composition Design, expensive alloy element is more, and cost is higher, is not suitable for business promotion.
Summary of the invention
The main object of the present invention is to provide a kind of stirred pot steel and production method thereof with excellent abrasive resistance, steel lower yield strength >=500MPa, tensile strength >=590MPa for the stirred pot of its production, unit elongation can reach A >=18%, its surface hardness HV10 reaches more than 170 (containing 170) simultaneously, improves thus the wear resisting property of stirred pot steel.
Realize above-mentioned purpose, tensile strength 590MPa level stirred pot steel of the present invention, its chemical composition is by weight percentage: C:0.14～0.18%, Si≤0.15%, Mn:1.35～1.55%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, Nb:0.020～0.035%, Ti:0.030～0.050%, surplus is Fe and inevitable impurity.
Preferably, its chemical composition is by weight percentage: C:0.15～0.17%, Si≤0.135%, Mn:1.40～1.50%, P≤0.013%, S≤0.005%, Als:0.040～0.050%, Cu:0.25～0.30%, Nb:0.025～0.030%, Ti:0.035～0.045%, surplus is Fe and inevitable impurity.
The production method of steel for above-mentioned tensile strength 590MPa level stirred pot, is undertaken by common Clean Steel technique, comprises that converter smelting, the refining of LF stove, continuous casting, strand heating, rolling, laminar flow are cooling, batches, the step of finishing, and its special character is:
When described LF stove refining, add Si-Ca line according to 0.70～0.75Kg/t steel, adding speed is 250～300m/min; The temperature of described strand heating is 1280～1310 DEG C, and be 40～50min heat-up time; When described rolling, carry out segmentation rolling, roughing end temp is at 1070～1110 DEG C, and finish rolling finishing temperature is at 850～890 DEG C; Described coiling temperature is 590～630 DEG C.
Preferably, when described laminar flow is cooling, is first 30～40 DEG C/sec according to the first speed of cooling and carries out coolingly, in the time being cooled to temperature to be 670～720 DEG C, then being 5～10 DEG C/sec according to the second speed of cooling and carrying out coolingly, be cooled to 590～630 DEG C.
Further, when described laminar flow is cooling, water coolant water temperature is 15～25 DEG C.
In steel of the present invention, in the mechanism of each constituent content control and effect and production process, processing parameter setting principle is as follows:
Carbon: carbon is cheap solution strengthening element.According to the range of application of this steel grade, be mainly used in processing stirred pot tank body and in stir the parts such as sheet, generally adopt welding processing moulding, therefore require material in meeting requirement of strength, there is good wear resisting property and welding property.If its content is less than 0.14%, can not meet the requirement of the strength of materials; If its content is greater than 0.18%, can not meet the good welds performance of material.So, its content is limited to 0.14～0.18% scope, be preferably 0.15～0.17%.
Silicon: silicon is cheap and effective steel liquid deoxidation element.Adding is in order to maintain strength of parent, to carry out pre-deoxidation, if its content exceedes 0.15%, can worsen the surface quality of hot-rolled steel sheet, affecting the outward appearance of product lower than 0.15% silicon, so, its content is limited to below 0.15%, be preferably≤0.135%.
Manganese: manganese is to improve intensity and the most effective element of toughness.If its content is less than 1.35%, can not meet strength of materials requirement; But add the manganese of volume, can cause increasing the hardening capacity of steel, because the appearance of welding hardened layer is increased crack sensitivity, and increase the cost of alloy of steel.Given this, will on it, be defined as 1.55%, so, its content is limited to 1.35～1.55% scopes, be preferably 1.40～1.50%.
Phosphorus: worsen for fear of the welding property of material, stamping performance, toughness, suitability for secondary processing, setting its upper content limit is 0.015%.Be preferably its content is controlled at below 0.013%.
Sulphur: sulphur is the element being harmful to very much.Sulphur in steel often exists with the oxide morphology of manganese, and this sulfide inclusion is very disadvantageous to the impelling strength of steel, and causes the anisotropy of performance, therefore, and need must be more low better by sulphur content control in steel.Based on the consideration to Steel Sheet technique and manufacturing cost, plan sulphur content in steel and be controlled at below 0.005%.
Aluminium: aluminium adds for deoxidation, in the time that Als contains quantity not sufficient 0.020%, can not bring into play its effect; On the other hand, because the aluminium that adds volume easily forms aluminum oxide agglomerate, so, on regulation Als, be limited to 0.060%.Therefore, Als weight percentage is limited to 0.020～0.060% scope, is preferably 0.040～0.050% scope.
Copper: copper forms tiny precipitated phase in steel, plays " pinning " effect to the dislocation in steel when deformation of steel, can improve intensity and toughness, and be conducive to the wear resisting property of steel.Copper plays the effect of reinforced ferrite, adds copper in ferrite, can improve its solidity to corrosion in some reductant and the toughness of improving steel, in the time combining use with P, can improve the slushing oil of steel to atmosphere especially.In the time that its content is less than 0.20%, can not meet the requirement of the strength of materials, wear resistance and Corrosion Protection; In the time that its content is greater than 0.33%, easily produce hot-shortly, cause material plasticity significantly to reduce.So, its content is limited to 0.20～0.33% scope, be preferably 0.25～0.30% scope.
Niobium: niobium mainly improves the intensity of steel by crystal grain thinning and precipitation hardening, be strong carbon, nitrogen compound forming element, in steel, mainly exist with Nb (C, N) form, stop growing up of austenite crystal, finally make ferrite grain size diminish, thinning microstructure.When its content is lower than 0.020% time, can not meet the high-intensity requirement of material; And the niobium adding is higher than 0.035% time, cost of alloy can significantly rise.So, according to mechanical property target call, its content is limited to 0.020～0.035%, be preferably 0.025～0.030% scope.
Titanium: titanium can crystal grain thinning and improved the strength and toughness of steel, and favourable to welding property, the AUSTENITE GRAIN COARSENING that the titanium nitride generating in steel produces during to welding heating has preventing effectiveness.In the time that it contains quantity not sufficient 0.03%, can not enough bring into play its strengthening effect, do not reach the requirement of strength of material; On the other hand, when the titanium adding exceedes 0.05%, cost of alloy can significantly rise.According to mechanical property target call, its titanium content is limited to 0.030～0.050% scope, be preferably 0.035～0.045%.
Except the scope of above chemical composition having been done to restriction, from improving the viewpoint of weldability, economy, the present invention does not add the precious alloy elements such as Ni, Cr, Mo.
In the production process of steel of the present invention, the control of slab heating temperature and time, is one of critical process of the present invention.Take 1280～1310 DEG C of heating, control heat-up time is in order to ensure that the alloying element in steel billet dissolves completely at 40～50min simultaneously, can effectively bring into play precipitation strength and the refined crystalline strengthening effect of alloying element, meets the requirement of strength of material.
When rolling, take segmentation rolling, and control roughing end temp at 1070～1110 DEG C, controlling finish rolling finishing temperature is also critical process of the present invention at 850～890 DEG C.This is because if roughing end temp lower than 1070 DEG C, cannot ensure that finish rolling finishing temperature reaches set(ting)value, increases rolling load, increases energy consumption; As higher than 1110 DEG C, can produce more iron scale, affect the surface quality of steel.If finish rolling finishing temperature, lower than 850 DEG C, can be rolled in the two-phase region of material, cause the defects such as mixed crystal; As higher than 890 DEG C, the original austenite grains of steel can be too thick, reduces the intensity of steel.
The cooling employing cooling speed change cooling of laminar flow carries out, being first 30～40 DEG C/sec according to speed of cooling carries out cooling, to be cooling in order ensureing to carry out in time in the time that the recrystal grain of steel does not also start to grow up, to avoid the generation of thick tissue, make material obtain tiny metallographic structure; In the time being cooled to temperature to be 670～720 DEG C, be 5～10 DEG C/sec according to speed of cooling again and carry out coolingly, be cooled to 590～630 DEG C, be conducive to like this obtain uniform metallographic structure, the precipitates such as carbide can even dispersion be distributed in base steel, ensure that material possesses good processability.
Compared with prior art, the stirred pot that the present invention produces has lower yield strength >=500MPa, reach >=590MPa of tensile strength with steel, unit elongation can reach A >=18%, its surface hardness HV10 reaches more than 170 (containing 170) simultaneously, improves thus the wear resisting property of stirred pot steel.
Brief description of the drawings
Fig. 1 is the metallographic structure figure of tensile strength 590MPa level stirred pot of the present invention steel.
Embodiment
Below in conjunction with the drawings and specific embodiments, tensile strength 590MPa level stirred pot of the present invention is described in detail by steel and production method thereof.
The selected tensile strength 590MPa level of each embodiment stirred pot is with the chemical composition of steel (surplus is Fe and inevitable impurity) as shown in table 1 by weight percentage.
The value list of table 1 various embodiments of the present invention
The preparation method of the various embodiments described above steel is undertaken by common Clean Steel technique, comprise that converter smelting, the refining of LF stove, continuous casting, strand heating, rolling, laminar flow are cooling, batch, the step of finishing, wherein, while processing in LF stove, add Si-Ca line according to 0.70～0.75Kg/t steel, adding speed is 250～300m/min; Slab heating temperature is controlled at 1280～1310 DEG C, heat-up time 40～50min; When rolling, carry out segmentation rolling, roughing end temp is at 1070～1110 DEG C, and finish rolling finishing temperature is at 850～890 DEG C; Described coiling temperature is at 590～630 DEG C; When described laminar flow is cooling, is first 30～40 DEG C/sec according to the first speed of cooling and carries out coolingly, in the time being cooled to temperature to be 670～720 DEG C, then being 5～10 DEG C/sec according to the second speed of cooling and carrying out coolingly, be cooled to 590～630 DEG C; When described laminar flow is cooling, water coolant water temperature is at 15～25 DEG C.
The concrete processing parameter that the various embodiments described above steel is corresponding is as shown in table 2.
Main technologic parameters list in the production process of table 2 various embodiments of the present invention.
The tensile strength 590MPa level stirred pot that the various embodiments described above are produced detects by the over-all properties of steel, and the test item of corresponding embodiment and corresponding result are as shown in table 3.
Table 3 various embodiments of the present invention mechanical properties test the results list
Accompanying drawing 1 shows, the metallographic structure of steel of the present invention is: ferrite+perlite.As can be seen from Table 3, steel of the present invention has steel lower yield strength >=500MPa, tensile strength >=590MPa, unit elongation can reach A >=18%, and its surface hardness HV10 reaches more than 170 (containing 170) simultaneously, improves thus the wear resisting property of stirred pot steel.So the present invention reaches outside technical requirements at the intensity and the unit elongation that ensure steel, steel also have higher surface hardness, have ensured that steel, in the time manufacturing the parts such as stirred pot, have good wear resisting property.
Claims (5)
1. a tensile strength 590MPa level stirred pot steel, it is characterized in that: its chemical composition is by weight percentage: C:0.14～0.18%, Si≤0.15%, Mn:1.35～1.55%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, Nb:0.020～0.035%, Ti:0.030～0.050%, surplus is Fe and inevitable impurity.
2. tensile strength 590MPa level stirred pot steel according to claim 1, it is characterized in that: its chemical composition is by weight percentage: C:0.15～0.17%, Si≤0.135%, Mn:1.40～1.50%, P≤0.013%, S≤0.005%, Als:0.040～0.050%, Cu:0.25～0.30%, Nb:0.025～0.030%, Ti:0.035～0.045%, surplus is Fe and inevitable impurity.
3. the production method of a tensile strength 590MPa level stirred pot use steel claimed in claim 1, undertaken by common Clean Steel technique, comprise that converter smelting, the refining of LF stove, continuous casting, strand heating, rolling, laminar flow are cooling, batch, the step of finishing, it is characterized in that:
When described LF stove refining, add Si-Ca line according to 0.70～0.75Kg/t steel, adding speed is 250～300m/min; The temperature of described strand heating is 1280～1310 DEG C, and be 40～50min heat-up time; When described rolling, carry out segmentation rolling, roughing end temp is at 1070～1110 DEG C, and finish rolling finishing temperature is 850～890 DEG C; Described coiling temperature is 590～630 DEG C.
4. the production method of steel for tensile strength 590MPa level stirred pot according to claim 3, it is characterized in that: when described laminar flow is cooling, first being 30～40 DEG C/sec according to the first speed of cooling carries out cooling, in the time being cooled to temperature to be 670～720 DEG C, be 5～10 DEG C/sec according to the second speed of cooling again and carry out coolingly, be cooled to 590～630 DEG C.
5. the production method with steel according to the tensile strength 590MPa level stirred pot described in claim 3 or 4, is characterized in that: when described laminar flow is cooling, water coolant water temperature is 15～25 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182893A (en) * | 2018-08-14 | 2019-01-11 | 河钢股份有限公司承德分公司 | It is a kind of to make vehicle-mounted concrete tank body steel plate and its production method |
| CN109321832A (en) * | 2018-11-19 | 2019-02-12 | 河钢股份有限公司承德分公司 | Make the production method of vehicle-mounted concrete tank body |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776442A (en) * | 2012-07-27 | 2012-11-14 | 武汉钢铁(集团)公司 | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof |
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- 2014-08-25 CN CN201410420787.7A patent/CN104195437A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102776442A (en) * | 2012-07-27 | 2012-11-14 | 武汉钢铁(集团)公司 | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182893A (en) * | 2018-08-14 | 2019-01-11 | 河钢股份有限公司承德分公司 | It is a kind of to make vehicle-mounted concrete tank body steel plate and its production method |
| CN109321832A (en) * | 2018-11-19 | 2019-02-12 | 河钢股份有限公司承德分公司 | Make the production method of vehicle-mounted concrete tank body |
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