CN104213022A - Agitation tank steel with tensile strength of 650 MPa grade and production method thereof - Google Patents
Agitation tank steel with tensile strength of 650 MPa grade and production method thereof Download PDFInfo
- Publication number
- CN104213022A CN104213022A CN201410421933.8A CN201410421933A CN104213022A CN 104213022 A CN104213022 A CN 104213022A CN 201410421933 A CN201410421933 A CN 201410421933A CN 104213022 A CN104213022 A CN 104213022A
- Authority
- CN
- China
- Prior art keywords
- steel
- tensile strength
- cooling
- production method
- stirred pot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention mainly aims to provide agitation tank steel with a tensile strength of 650 MPa grade and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.14-0.18% of C, not more than 0.15% of Si, 1.56-1.80% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.020-0.060% of Als, 0.20-0.33% of Cu, 0.036-0.055% of Nb and 0.051-0.069% of Ti, the balance being Fe and inevitable impurities. The production method is based on a general clean steel process and comprises the steps of converter smelting, LF furnace refining, continuous casting, ingot heating, rolling, laminar cooling, coiling and finishing. The practice shows that the lower yield strength of the steel is not less than 550 MPa, the tensile strength is not less than 650 MPa, the ductility can reach A not less than 16%, and the surface hardness HV10 reaches 200 and above, so that the wear resistance of the agitation tank steel 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 650MPa 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 200710196975.6, discloses a kind of high intensity and high-toughness hot-rolled steel sheet, and the weight percent of its Chemical Composition and each composition is: carbon: 0.03～0.09%; Silicon: 0.15～0.35%; Manganese: 1.40～2.0%; Aluminium: 0.02～0.05%; Niobium: 0.05～0.13%; Titanium: 0.010～0.025%; Copper≤0.30%; Chromium≤0.30%; Phosphorus≤0.012%; Sulphur≤0.004%; Nitrogen≤0.004%; All the other are iron; And carbon equivalent Ceq should be not more than 0.44, crack-sensitivity indices P cm should be not more than 0.23, and its production stage is: molten iron pre-desulfurization, converter smelting, LF refining, RH (VD) processing, sheet billet continuous casting, slab reheat, temperature controlled rolling, control that cooling, hot straightening, cold bed are cooling, cooling in heap.In this patent application, C content is lower, and the wear resisting property of steel is relatively poor, and in Composition Design, contains the elements such as chromium, and cost is higher.
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 >=550MPa, tensile strength >=650MPa for the stirred pot of its production, unit elongation can reach A >=16%, its surface hardness HV10 reaches more than 200 (containing 200) simultaneously, improves thus the wear resisting property of steel for stirred pot.
Realize above-mentioned purpose, tensile strength 650MPa level stirred pot steel of the present invention, its chemical composition is C:0.14～0.18% by weight percentage, Si≤0.15%, Mn:1.56～1.80%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, Nb:0.036～0.055%, Ti:0.051～0.069%, surplus is Fe and inevitable impurity.
Preferably, its chemical composition is by weight percentage: C:0.15～0.16%, Si≤0.13%, Mn:1.64～1.70%, P≤0.012%, S≤0.005%, Als:0.040～0.045%, Cu:0.25～0.30%, Nb:0.040～0.045%, Ti:0.055～0.064%, surplus is Fe and inevitable impurity.
The production method of steel for above-mentioned tensile strength 650MPa 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 0.65～0.70Kg/t steel, add Si-Ca line, adding speed is 250～300m/min; The temperature of described strand heating is 1300～1330 ℃, and be 50～60min heat-up time; During described rolling, carry out segmentation rolling, roughing end temp is at 1090～1130 ℃, and finish rolling finishing temperature is at 860～900 ℃; Described coiling temperature is at 610～650 ℃.
Preferably, when described laminar flow is cooling, first according to the first speed of cooling, is 35～45 ℃/sec and carries out coolingly, when being cooled to temperature to be 660～710 ℃, then according to the second speed of cooling, being 5～10 ℃/sec and carrying out coolingly, be cooled to 610～650 ℃.
Further, when described laminar flow is cooling, water coolant water temperature is 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≤0.13%.
Manganese: manganese is to improve intensity and the most effective element of toughness.If its content is less than 1.56%, 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 1.80%, so, its content is limited to 1.56～1.80% scopes, be preferably 1.64～1.70%.
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%.So 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 0.040～0.045% 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.
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 with Nb (C, N) form, exist, stop growing up of austenite crystal, finally make ferrite grain size diminish, thinning microstructure.When its content is lower than 0.036% time, can not meet the high-intensity requirement of material; And the niobium adding is higher than 0.055% time, cost of alloy can significantly rise.So, according to mechanical property target call, its content is limited to 0.036～0.055% scope, be preferably 0.040～0.045%.
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.When it contains quantity not sufficient 0.051%, 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 surpasses 0.069%, cost of alloy can significantly rise.According to mechanical property target call, its titanium content is limited to 0.051～0.069% scope, be preferably 0.055～0.064%.
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.
The control of the production method of steel of the present invention to strand heat temperature and time is one of critical process of the present invention.Take 1300～1330 ℃ of heating, control the heat time is in order to guarantee that the alloying element in steel billet dissolves completely at 50～60min simultaneously, can effectively bring into play precipitation strength and the refined crystalline strengthening effect of alloying element, meets the requirement of strength of material.During rolling, carry out segmentation rolling, and control roughing end temp at 1090～1130 ℃, controlling finish rolling finishing temperature is also critical process of the present invention at 860～900 ℃.This is because if roughing end temp lower than 1090 ℃, cannot guarantee that finish rolling finishing temperature reaches set(ting)value, increases rolling load, increases energy consumption; As higher than 1130 ℃, can produce more iron scale, affect the surface quality of steel.If finish rolling finishing temperature, lower than 860 ℃, 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.
The cooling employing cooling speed change cooling of technique laminar flow of the present invention carries out, first according to speed of cooling, being 35～45 ℃/sec carries out cooling, to be cooling in order guaranteeing to carry out in time when 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; When being cooled to temperature to be 660～710 ℃, according to speed of cooling, be 5～10 ℃/sec again and carry out coolingly, be cooled to 610～650 ℃, 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.
Compared with prior art, stirred pot of the present invention has lower yield strength >=550MPa, tensile strength >=650MPa with steel, unit elongation can reach A >=16%, and its surface hardness HV10 reaches more than 200 (containing 200) 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 650MPa level stirred pot of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, tensile strength 650MPa level stirred pot of the present invention is described in detail by steel and production method thereof.
The selected tensile strength 650MPa 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, during the refining of LF stove, according to 0.65～0.70Kg/t steel, add Si-Ca line, adding speed is 250～300m/min; The temperature of strand heating is 1300～1330 ℃, and be 50～60min heat-up time; During rolling, carry out segmentation rolling, roughing end temp is at 1090～1130 ℃, and finish rolling finishing temperature is at 860～900 ℃; Coiling temperature is at 610～650 ℃; When laminar flow is cooling, first according to the first speed of cooling, is 35～45 ℃/sec and carries out coolingly, when being cooled to temperature to be 660～710 ℃, then according to the second speed of cooling, being 5～10 ℃/sec and carrying out coolingly, be cooled to 610～650 ℃; When laminar flow is cooling, water coolant water temperature is 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 650MPa 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: bainite+ferrite+a small amount of perlite.As can be seen from Table 3, steel of the present invention has lower yield strength >=550MPa, tensile strength >=650MPa, and unit elongation can reach A >=16%, and its surface hardness HV10 reaches more than 200 (containing 200) 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 650MPa 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:1.56～1.80%, P≤0.015%, S≤0.005%, Als:0.020～0.060%, Cu:0.20～0.33%, Nb:0.036～0.055%, Ti:0.051～0.069%, surplus is Fe and inevitable impurity.
2. tensile strength 650MPa 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≤0.13%, Mn:1.64～1.70%, P≤0.012%, S≤0.005%, Als:0.040～0.045%, Cu:0.25～0.30%, Nb:0.040～0.045%, Ti:0.055～0.064%, surplus is Fe and inevitable impurity.
3. the production method of steel for a tensile strength 650MPa level stirred pot claimed in claim 1, by common Clean Steel 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 0.65～0.70Kg/t steel, add Si-Ca line, adding speed is 250～300m/min; The temperature of described strand heating is 1300～1330 ℃, and be 50～60min heat-up time; During described rolling, carry out segmentation rolling, roughing end temp is at 1090～1130 ℃, and finish rolling finishing temperature is 860～900 ℃; Described coiling temperature is 610～650 ℃.
4. the production method of steel for tensile strength 650MPa 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 35～45 ℃/sec carries out cooling, when being cooled to 660～710 ℃, according to the second speed of cooling, be 5～10 ℃/sec again and carry out coolingly, be cooled to 610～650 ℃.
5. the production method with steel according to the tensile strength 650MPa 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 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410421933.8A CN104213022A (en) | 2014-08-25 | 2014-08-25 | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410421933.8A CN104213022A (en) | 2014-08-25 | 2014-08-25 | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104213022A true CN104213022A (en) | 2014-12-17 |
Family
ID=52094923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410421933.8A Pending CN104213022A (en) | 2014-08-25 | 2014-08-25 | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104213022A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110527923A (en) * | 2019-06-03 | 2019-12-03 | 武汉钢铁有限公司 | A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method |
| CN111270163A (en) * | 2020-03-18 | 2020-06-12 | 武汉钢铁有限公司 | High-strength suspension arm steel with thickness of 4-8 mm and preparation method thereof |
| CN116694992A (en) * | 2023-05-29 | 2023-09-05 | 武汉钢铁有限公司 | High-strength lightweight wear-resistant steel for stirring tank and manufacturing method thereof |
Citations (2)
| 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 |
| CN103518000A (en) * | 2011-05-12 | 2014-01-15 | 日本发条株式会社 | Steel for automotive suspension spring component, automotive suspension spring component, and manufacturing method for same |
-
2014
- 2014-08-25 CN CN201410421933.8A patent/CN104213022A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103518000A (en) * | 2011-05-12 | 2014-01-15 | 日本发条株式会社 | Steel for automotive suspension spring component, automotive suspension spring component, and manufacturing method for same |
| 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 (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN110527923A (en) * | 2019-06-03 | 2019-12-03 | 武汉钢铁有限公司 | A kind of 600MPa grades of body of a motor car high-yield-ratio structural steel and production method |
| 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 |
| CN110527923B (en) * | 2019-06-03 | 2021-10-26 | 武汉钢铁有限公司 | High-yield-ratio structural steel for 600 MPa-grade automobile body and production method thereof |
| CN111270163A (en) * | 2020-03-18 | 2020-06-12 | 武汉钢铁有限公司 | High-strength suspension arm steel with thickness of 4-8 mm and preparation method thereof |
| CN111270163B (en) * | 2020-03-18 | 2021-04-27 | 武汉钢铁有限公司 | High-strength suspension arm steel with thickness of 4-8 mm and preparation method thereof |
| CN116694992A (en) * | 2023-05-29 | 2023-09-05 | 武汉钢铁有限公司 | High-strength lightweight wear-resistant steel for stirring tank and manufacturing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102776442B (en) | Hot rolled steel used for stirrer in automotive stirring tank and production method thereof | |
| CN102199723B (en) | High-strength cold-rolled hot-galvanized precipitation reinforced steel and manufacturing method thereof | |
| CN107119228B (en) | A kind of 700~800MPa of tensile strength grades of hot rolling high-strength light dual phase steels and its manufacturing method | |
| JP7457843B2 (en) | Steel plate for polar marine construction and its manufacturing method | |
| CN101781742B (en) | Medium-thickness ship plate steel with ultrahigh intensity and low-temperature impact toughness and manufacturing method thereof | |
| CN101768698B (en) | Low cost yield strength 700MPA level non-tempering processing high strength steel plate and manufacturing method thereof | |
| CN103255342B (en) | A kind of 600MPa grade high-strength hot continuous rolling structure iron and manufacture method thereof | |
| CN104498821B (en) | Medium-manganese high-strength steel for automobiles and production method thereof | |
| CN102409260A (en) | Thick plate with good low-temperature toughness for pressure container and production method of thick plate | |
| CN107964624A (en) | A kind of yield strength 500MPa level structure steel and preparation method thereof | |
| CN105925905B (en) | 780MPa grades of hot-rolled dual-phase steels of Nb-Ti systems and its production method | |
| CN103667948B (en) | A kind of Multiphase Steel and preparation method thereof | |
| CN106811684B (en) | 750Mpa grades of container hot rolled steel plates of yield strength and its manufacturing method | |
| CN102560285B (en) | Soft austenitic stainless steel and preparation method thereof | |
| CN104357742A (en) | 420MPa high-thickness hot-rolled steel sheet for ocean engineering and production method thereof | |
| CN104120368A (en) | High-strength austenitic stainless steel for automobile frames and manufacturing method thereof | |
| CN104032215A (en) | 420MPa grade steel for automobile wheel and production method thereof | |
| CN104213022A (en) | Agitation tank steel with tensile strength of 650 MPa grade and production method thereof | |
| CN104131238B (en) | High molding high durable Ultra-thin hot rolled steel plate and CSP production technology thereof | |
| CN102212747A (en) | Low-cost steel for automobile beam and manufacturing method thereof | |
| CN105779885B (en) | A kind of wear-resistant hot rolling sheet metal and its manufacture method with excellent machinability | |
| CN105803334A (en) | Hot-rolled complex phase steel with tensile strength of 700 MPa and production method thereof | |
| CN107699791A (en) | High cold-bending property low-alloy high-strength steel plate of 900MPa levels and preparation method thereof | |
| CN102409233A (en) | Low-temperature steel for engineering machinery and production method thereof | |
| CN105200329A (en) | Tensile strength-700MPa level easy-to-weld low-internal-stress structural steel plate and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141217 |
|
| RJ01 | Rejection of invention patent application after publication |