CN104195438A - Steel with 520MPa-grade tensile strength for agitator tank and production method of steel - Google Patents
Steel with 520MPa-grade tensile strength for agitator tank and production method of steel Download PDFInfo
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- CN104195438A CN104195438A CN201410420788.1A CN201410420788A CN104195438A CN 104195438 A CN104195438 A CN 104195438A CN 201410420788 A CN201410420788 A CN 201410420788A CN 104195438 A CN104195438 A CN 104195438A
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Abstract
The invention provides steel with 520MPa-grade tensile strength for an agitator tank and a production method of the steel. The steel comprises the following chemical components in percentage by weight: 0.14-0.18% of C, no more than 0.15% of Si, 1.20-1.50% of Mn, no more than 0.015% of P, no more than 0.005% of S, 0.020-0.060% of Als, 0.20-0.33% of Cu, the balance of Fe and inevitable impurities. The production method of the steel is carried out according to an ordinary clean steel process and comprises the following steps: converter smelting, LF refining, continuous casting, casting blank heating, rolling, laminar cooling, reeling up, and finishing. The lower yield strength of the steel is greater than or equal to 365MPa, the tensile strength is greater than or equal to 520MPa, the elongation percentage can reach A which is greater than or equal to 20%, and meanwhile, the surface hardness HV10 is over 140, and thus the wear-resisting property of the steel for the agitator tank is improved.
Description
Technical field
The present invention relates to steel and production method technical field thereof, specifically refer to steel and production method thereof for a kind of tensile strength 520MPa level stirred pot.
Background technology
The whipping appts of concrete drums is comprised 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, and the equipment of He Ge factory, technology, raw material etc. are relevant.
Before the present invention, the Chinese invention patent that application number is 201310615792.9, discloses a kind of 520MPa level hot rolling concrete drums steel plate.The chemical composition of described steel plate is C:0.12～0.17%, Si:0.20～0.30%, Mn:1.3～1.6%, P≤0.015%, S≤0.010%, Cu:0.20～0.30% by weight percentage, and surplus is Fe and inevitable impurity.Adopt controlled rolling and controlled cooling technique finally to obtain and take tiny ferrite and pearlite as main metallographic structure, thereby obtained a kind of tensile strength and be greater than 520MPa, there is the concrete drums steel plate of good wear resisting property, cold forming capability and welding property.In this patent application, Si content is higher, but in embodiment, product made from steel tensile strength is lower, less with respect to the surplus capacity of standard-required.
Summary of the invention
The main object of the present invention is to provide a kind of steel and production method thereof for stirred pot with excellent abrasive resistance, steel lower yield strength >=365MPa, tensile strength >=520MPa for the stirred pot of its production, unit elongation can reach A >=20%, its surface hardness HV10 reaches more than 140 (containing 140) simultaneously, improves thus the wear resisting property of steel for stirred pot.
Realize above-mentioned purpose, tensile strength 520MPa level stirred pot steel of the present invention, its chemical composition is by weight percentage: C:0.14～0.18%, Si≤0.15%, Mn:1.20～1.50%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, surplus is Fe and inevitable impurity.
Preferably, its chemical composition is by weight percentage: C:0.15～0.16%, Si≤0.125%, Mn:1.30～1.45%, P≤0.012%, S≤0.005%, Als:0.035～0.045%, Cu:0.25～0.30%, surplus is Fe and inevitable impurity.
The production method of steel for above-mentioned tensile strength 520MPa 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:
During described LF stove refining, according to 0.75～0.80Kg/t steel, add Si-Ca line, adding speed is 250～300m/min;
Slab heating temperature is controlled at 1300～1350 ℃, heat-up time 30～40min;
During described rolling, carry out segmentation rolling, roughing end temp is at 1060～1100 ℃, and finish rolling finishing temperature is 840～900 ℃;
Described coiling temperature is 560～620 ℃.
Preferably, when described laminar flow is cooling, first according to the first speed of cooling, is 20～30 ℃/sec and carries out coolingly, when being cooled to temperature to be 680～730 ℃, then according to the second speed of cooling, being 5～10 ℃/sec and carrying out coolingly, be cooled to 560～620 ℃; And control water coolant water temperature at 15～25 ℃.
In the mechanism that in steel of the present invention, each constituent content is controlled 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 when 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 0.15～0.16%.
Silicon: silicon is cheap and effective steel liquid deoxidation element.Interpolation is in order to maintain strength of parent, to carry out pre-deoxidation lower than 0.15% silicon, if its content surpasses 0.15%, can worsen the surface quality of hot-rolled steel sheet, affects the outward appearance of product, so, its content is limited to below 0.15%, be preferably≤0.125%.
Manganese: manganese is to improve intensity and the most effective element of toughness.If its content is less than 1.20%, can not meet strength of materials requirement; But add the manganese of volume, can cause increasing the hardening capacity of steel, owing to welding the appearance of hardened layer, crack sensitivity is increased, and increase the cost of alloy of steel.Given this, will on it, be defined as 1.50%, so, its content is limited to 1.20～1.50% scopes, be preferably 1.30～1.45%.
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%, is preferably its content is controlled at below 0.012%.
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, sulphur content in steel need be controlled more low better.Consideration based on to Steel Sheet technique and manufacturing cost, plans sulphur content in steel and is controlled at below 0.005%.
Aluminium: aluminium adds for deoxidation, when Als contains quantity not sufficient 0.020%, can not bring into play its effect; On the other hand, owing to adding the aluminium of volume, easily form aluminum oxide agglomerate, so, on regulation Als, be limited to 0.060%.Therefore, Als content is limited to 0.020～0.060% scope, is preferably 0.035～0.045% scope.
Copper: copper forms tiny precipitated phase in steel, plays " pinning " effect to the dislocation in steel during 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, when combining use with P, can improve the slushing oil of steel to atmosphere especially.When its content is less than 0.20%, can not meet the requirement of the strength of materials, wear resistance and Corrosion Protection; When 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.
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 Nb, Ti, Ni, Cr, Mo.
In production method of the present invention, carrying out the control of strand heat temperature and heat-up time, is one of critical process of the present invention.Taking 1300～1350 ℃ of heat is in order to guarantee that the alloying element in steel billet dissolves completely, and it is in order to reduce oxidization time in the stove of steel billet that the heat time is controlled at 30～40min, reduces the iron scale of billet surface, improves surface quality.About carrying out segmentation rolling, and control roughing end temp at 1060～1100 ℃, controlling finish rolling finishing temperature is also critical process of the present invention at 840～900 ℃.This is because if roughing end temp lower than 1060 ℃, cannot guarantee that finish rolling finishing temperature reaches set(ting)value, increases rolling load, increases energy consumption; As higher than 1100 ℃, can produce more iron scale, affect the surface quality of steel.If finish rolling finishing temperature, lower than 840 ℃, can be rolled in the two-phase region of material, cause the defects such as mixed crystal; As higher than 900 ℃, the original austenite grains of steel can be too thick, reduces the intensity of steel.
It is cooling that production technique employing cooling speed change cooling of the present invention carries out laminar flow, first according to speed of cooling, being 20～30 ℃/sec carries out cooling, cooling in order to guarantee to carry out in time when the recrystal grain of steel does not also start to grow up, avoid the generation of thick tissue, make material obtain tiny metallographic structure; When being cooled to temperature to be 680～730 ℃, according to speed of cooling, be 5～10 ℃/sec again and carry out coolingly, be cooled to 560～620 ℃, be conducive to like this obtain uniform metallographic structure, the precipitates such as carbide can even dispersion be distributed in base steel, guarantee that material possesses good processability.
The present invention compared with prior art, the stirred pot of producing has lower yield strength ReL >=365MPa with steel, and tensile strength Rm >=520MPa, in the time of elongation A >=20%, its surface hardness HV10 reaches more than 140 (containing 140) simultaneously, improves thus the wear resisting property of steel for stirred pot.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of steel for tensile strength 520MPa level stirred pot of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, tensile strength 520MPa level stirred pot of the present invention is described in detail by steel and production method thereof.
The selected tensile strength 520MPa 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
| Embodiment | C | Si | Mn | P | S | Cu | Als |
| 1 | 0.14 | 0.122 | 1.35 | 0.012 | 0.003 | 0.25 | 0.045 |
| 2 | 0.16 | 0.133 | 1.28 | 0.011 | 0.004 | 0.20 | 0.047 |
| 3 | 0.15 | 0.112 | 1.49 | 0.013 | 0.005 | 0.28 | 0.041 |
| 4 | 0.18 | 0.127 | 1.20 | 0.012 | 0.003 | 0.27 | 0.043 |
| 5 | 0.17 | 0.115 | 1.41 | 0.015 | 0.003 | 0.33 | 0.044 |
| 6 | 0.16 | 0.120 | 1.37 | 0.014 | 0.004 | 0.29 | 0.030 |
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, according to 0.75～0.80Kg/t steel, add Si-Ca line, adding speed is 250～300m/min; Slab heating temperature is controlled at 1300～1350 ℃, heat-up time 30～40min; During rolling, carry out segmentation rolling, roughing end temp is at 1060～1100 ℃, and finish rolling finishing temperature is at 840～900 ℃; Described coiling temperature is at 560～620 ℃; When described laminar flow is cooling, first according to the first speed of cooling, is 20～30 ℃/sec and carries out coolingly, when being cooled to temperature to be 680～730 ℃, then according to the second speed of cooling, being 5～10 ℃/sec and carrying out coolingly, be cooled to 560～620 ℃; When described laminar flow is cooling, water coolant water temperature is at 15～25 ℃.
The concrete processing parameter that the various embodiments described above steel is corresponding is as shown in table 2.
The main technologic parameters list of table 2 various embodiments of the present invention
The tensile strength 520MPa 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 demonstration, 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 lower yield strength ReL >=365MPa, tensile strength Rm >=520MPa, and in the time of elongation A >=20%, its surface hardness HV10 reaches more than 140 simultaneously, improves thus the wear resisting property of steel for stirred pot.So the present invention reaches outside technical requirements at the intensity and the unit elongation that guarantee steel, steel also have higher surface hardness, have guaranteed that steel, when manufacturing the parts such as stirred pot, have good wear resisting property.
Claims (5)
1. a tensile strength 520MPa 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:1.20～1.50%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, surplus is Fe and inevitable impurity.
2. tensile strength 520MPa level stirred pot steel according to claim 1, it is characterized in that, its chemical composition is by weight percentage: C:0.15～0.16%, Si≤0.125%, Mn:1.30～1.45%, P≤0.012%, S≤0.005%, Als:0.035～0.045%, Cu:0.25～0.30%, surplus is Fe and inevitable impurity.
3. the production method of steel for a tensile strength 520MPa level stirred pot claimed in claim 1, by common Clean Steel production technique, undertaken, 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:
During described LF stove refining, according to 0.75～0.80Kg/t steel, add Si-Ca line, adding speed is 250～300m/min;
The temperature of described strand heating is 1300～1350 ℃, and be 30～40min heat-up time;
During described rolling, carry out segmentation rolling, roughing end temp is at 1060～1100 ℃, and finish rolling finishing temperature is 840～900 ℃;
Described coiling temperature is 560～620 ℃.
4. the production method of steel for tensile strength 520MPa level stirred pot according to claim 3, it is characterized in that: when described laminar flow is cooling, first according to the first speed of cooling, being 20～30 ℃/sec carries out cooling, when being cooled to temperature to be 680～730 ℃, according to the second speed of cooling, be 5～10 ℃/sec again and carry out coolingly, be cooled to 560～620 ℃.
5. the production method with steel according to the tensile strength 520MPa 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 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085592A (en) * | 2017-12-08 | 2018-05-29 | 南京钢铁股份有限公司 | A kind of 390MPa grades of ship steels of yield strength and preparation method less than or equal to 100mm thickness |
| CN110172643A (en) * | 2019-06-03 | 2019-08-27 | 武汉钢铁有限公司 | A kind of production method reducing the agitator tank peeling of steel surface containing Cu |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002053928A (en) * | 2000-08-01 | 2002-02-19 | Nippon Steel Corp | High tensile strength steel for superlarge heat input welding |
| 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 |
-
2014
- 2014-08-25 CN CN201410420788.1A patent/CN104195438A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002053928A (en) * | 2000-08-01 | 2002-02-19 | Nippon Steel Corp | High tensile strength steel for superlarge heat input welding |
| 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108085592A (en) * | 2017-12-08 | 2018-05-29 | 南京钢铁股份有限公司 | A kind of 390MPa grades of ship steels of yield strength and preparation method less than or equal to 100mm thickness |
| CN110172643A (en) * | 2019-06-03 | 2019-08-27 | 武汉钢铁有限公司 | A kind of production method reducing the agitator tank peeling of steel surface containing Cu |
| CN110172643B (en) * | 2019-06-03 | 2021-04-06 | 武汉钢铁有限公司 | Production method for reducing surface peeling of Cu-containing steel for stirring tank |
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