CN101514429B - Boracic cold heading wire rod steel and production method thereof - Google Patents
Boracic cold heading wire rod steel and production method thereof Download PDFInfo
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- CN101514429B CN101514429B CN2009100612882A CN200910061288A CN101514429B CN 101514429 B CN101514429 B CN 101514429B CN 2009100612882 A CN2009100612882 A CN 2009100612882A CN 200910061288 A CN200910061288 A CN 200910061288A CN 101514429 B CN101514429 B CN 101514429B
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Abstract
The invention relates to a wire rod steel and a production method thereof, aiming at overcoming the defects that at present, spinning is carried out at the high temperature of 900-980 DEG C, the cooling velocity is high, and the wire rod steel has high original intensity and surface hardness, is easy to have the phenomenon of filament breakage when in the process of drawing, etc. The measurement is that the boracic cold heading wire rod steel has the chemical components based on the weight percentage: 0.18-0.23% of C, 0.01-0.085% of Si, 1.05-1.10% of Mn, less than or equal to 0.030% of P, less than or equal to 0.035% of S, 0.0006-0.0025% of B, less than or equal to 0.008% of N, 0.03-0.06% of Ti and the rest of Fe and unavoidable impurity. The technique is that continuously cast bloom is heated up to 1000-1035 DEG C with the section temperature being less than or equal to 30 DEG C; the start rolling temperature is 1000-1050 DEG C, and the finishing temperature is 960-990 DEG C; after the water is cooled, the spinning is at 815-845 DEG C; when the spinning is cooled to 580-630 DEG C, the cooling velocity is 0.5-2.0DEG C/s. The invention ensures the mechanical property, microscopic constitution, surface quality and cold heading property to reach the requirements of the user.
Description
Technical field
The present invention relates to wire rod steel and production method, specifically belong to the cold heading wire rod steel and the production method thereof of boracic.
Background technology
At first want cold drawn distortion when the user uses the wire rod steel wire rod, carry out cold-heading molding after pulling to necessary diameter, therefore very high to its cold deformation Capability Requirement.Boron steel be for satisfy the user when the cold-heading postheat treatment increasing the hardening capacity of steel, and have only solid solution boron, could increase the hardening capacity of steel, " boron phase " is compound, so it can not increase the hardening capacity of steel, and can worsen the plasticity of steel.Existing cooling controlling and rolling controlling process comprises two portions, controlled rolling (temperature control) part and the cold part of control, and temperature control partly comprises Heating temperature, heat-up time, start rolling temperature, goes into final rolling temperature, the isoparametric formulation of finishing temperature; Control state, blower fan open and-shut mode and the isoparametric setting of air quantity that cold part comprises laying temperature, stelmor roller speed, insulation cover.
Bibliographical information is arranged, and " in the hot procedure of boron steel, Heating temperature is lower than 1150 ℃, still some Fe
3(C B) does not dissolve in matrix, and Fe is just arranged after the hot-work
3(C B) remains on the austenite grain boundary, if the hot processing temperature of selecting for use is higher than 1150 ℃, because Fe
3(C, B), Fe
23(C, B)
6(boron phase) solid solution fully, that then be precipitated out in hot-work postcooling process is Fe entirely
23(C, B)
6Cool off kinetic curve continuously according to " boron phase ",, must change the speed of cooling after steel are processed eventually, make speed of cooling break away from about 3～0.3 ℃/second scope for avoiding " boron phase " precipitation.Experiment shows that in continuous cooling process, " boron phase " temperature of precipitation scope is 870～650 ℃, is not having " boron phase " precipitation more than 900 ℃, and stocking can stop rolling in comparatively high temps (900～950 ℃) in view of the above.The technology of Shoudu Iron and Steel Co: 1150～1200 ℃ of start rolling temperatures, 980～930 ℃ of laying temperatures are collected 480～550 ℃ of temperature.The postcooling speed of weaving silk is about 4 ℃/second.
According to thinking, the technology of above bibliographical information promptly is in the transformation temperature scope, when the speed of cooling of steel reaches 4 ℃/second, the machine that also will blow in just can reach, because laying temperature is to carry out when 900～980 ℃ of high temperature, and its speed of cooling height, makes this kind wire rod steel green strength height, surface hardness is big, follow-uply also to carry out processing such as drawing, cold-heading, and unannealed with regard to cold-heading after drawing, so easy fracture of wire in the drawing process, and work hardening is big, easily causes cold heading cracking.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, it is 820～840 that a kind of low laying temperature is provided, promptly 0.5～2.0 ℃/second of low speed of cooling, product satisfy the cold heading wire rod steel and the production method thereof of boracic of the requirement of low strength, high-ductility, nothing " boron phase ".
Realize the technical measures of above-mentioned purpose:
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.18～0.23, Si:0.01～0.085, Mn:1.05～1.10, P :≤0.03, S :≤0.035, B:0.0006～0.0025, N :≤0.008, Ti:0.03～0.06, all the other are Fe and unavoidable impurities.
Produce a kind of method of boracic cold heading wire rod steel, its step:
1) continuously cast bloom is heated to 1000～1035 ℃, section temperature difference≤30 ℃;
2) be rolled: its start rolling temperature is controlled at 1000～1050 ℃, and finishing temperature is controlled at 960～990 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 815～845 ℃;
4) weave silk postcooling to 580～630 ℃, its speed of cooling is controlled at 0.5～2.0 ℃/second.
It is: the speed of cooling in the step 4) is controlled at 1.0～1.5 ℃/second.
It is: in the step 4), and the postcooling to 590 of weaving silk～610 ℃.
The mechanism of each chemical element and effect among the present invention
Carbon: carbon is the principal element of decision carbon steel in cooled tissue and performance, the main effect of carbon in steel has: the one, form perlite, carbon form with FeC in perlite exists, the influence of steel cooling back microstructure shows as along with carbon content increases, ferrite content reduces, either pearlite occurred increases, and promptly the intensity of steel increases; The 2nd, play the effect of solution strengthening, promptly carbon with the gap solid solution in the lattice of iron.Therefore, the effect of carbon in steel mainly is the intensity that guarantees steel.
Manganese: manganese has good effect to the mechanical property of steel, and it is with substitute mode solid solution strengthening effect in steel; Manganese enters cementite instead of part iron atom, form MnC, so the increase of manganese can also improve the relative quantity of steel Medium pearlite.
Manganese also adds in the steel as the element of deoxidation sulphur removal, and manganese can improve the deoxidation effect of silicon and aluminium, with sulphur in conjunction with forming manganese sulfide, thereby on sizable degree, eliminate the harmful effect of sulphur in steel.The increase of manganese content has enlarged the austenite phase region simultaneously, and A3 point and A1 point are reduced, and helps this steel and carry out modifier treatment before finished product.The scope of manganese is elected 0.70-1.00% as.
Silicon: silicon is to add in the steel as deoxidant element, and silicon can increase the flowability of molten steel, and is favourable to the smooth casting of steel.But silicon is dissolved in the ferrite, improved the tensile strength of steel, every increase 0.1%Si in the steel, tensile strength improves 7.8-8.8MPa, yield-point improves 3.9-4.9MPa, it is about 0.5% that unit elongation descends, therefore, and in order to reduce the work hardening in the cold working process, improve the cold-forming property of steel, should be controlled at Si aborning≤below 0.10%, preferably be controlled at below 0.06%, but can not be 0%.
Sulphur: sulphur is harmful element.In the sulfurous gas that ore that it adds when mainly coming from pig iron raw material, steel-making and fuel combustion produce.The maximum harm of sulphur is ftractureed when hot-work, produces hot-short.Sulphur content height in the steel, the content of sulfide inclusion increases, and the plasticity of steel and toughness reduce, sulphur influences steel mechanical property, and is not only relevant with the sulphur content of steel, but also relevant with size, form and the distribution of the sulfide inclusion that forms, therefore, the content of sulphur be controlled at≤0.035%.
Phosphorus: phosphorus is the detrimental impurity element, derives from steelmaking feeds such as the ore and the pig iron, and phosphorus can improve the intensity of steel, but plasticity, toughness are reduced, and the brittle transition temperature of steel is sharply raise, and promptly improves the cold shortness (low temperature becomes fragile) of steel.Therefore phosphorus content be controlled at≤0.030%.
Aluminium: aluminium adds in the steel as deoxidant element, and the aluminum portions that adds in the molten steel combines formation Al with oxygen
2O
3Various inclusion floating in slag, play desoxydatoin, rest part dissolves in the solid iron, when heating and cooling, form the Als (AlN and Al) of disperse, stop austenite crystal to be grown up, play the effect of refine austenite crystal grain, the Als in the steel is controlled to be 0.02%-0.06%.
Nitrogen: be harmful element in this steel, easy and boron reaction generates boron phase BN, reduces the hardening capacity of steel.
Titanium: play fixed nitrogen and protect boron, in the steelmaking process, add in the steel, form TiN, make and do not form boron phase BN in the steel, the content of how much looking N in the molten steel that Ti adds with the nitrogen reaction.
Boron: micronutrient boron, owing to internal adsorption (being solid solution boron), and form the coherence tissue at crystal boundary, can significantly stop ferritic forming core, thereby increase the stability of supercooled austenite, improve the hardening capacity of steel.
Mechanical property of the present invention, microstructure, surface quality, cold heading performance all reach customer requirements.
Embodiment
Be described in detail below:
Embodiment 1
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.18, Si:0.01, Mn:0.80, P:0.03, S:0.035, B:0.0006, N:0.008, Ti:0.04, all the other are Fe and unavoidable impurities.
The method of the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1000 ℃, 30 ℃ of section temperature differences;
2) be rolled: its start rolling temperature is controlled at 1000 ℃, and finishing temperature is controlled at 960 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 815 ℃;
4) weave silk postcooling to 580 ℃, its speed of cooling is controlled at 0.5 ℃/second.
Embodiment 2
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.20, Si:0.028, Mn:0.95, P:0.025, S:0.032, B:0.001, N:0.006, Ti:0.048, all the other are Fe and unavoidable impurities.
The method of the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1020 ℃, 20 ℃ of section temperature differences;
2) be rolled: its start rolling temperature is controlled at 1005 ℃, and finishing temperature is controlled at 970 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 825 ℃;
4) weave silk postcooling to 590 ℃, its speed of cooling is controlled at 1.0 ℃/second.
Embodiment 3
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.21, Si:0.04, Mn:1.05, P:0.02, S:0.03, B:0.0015, N:0.006, Ti:0.051, all the other are Fe and unavoidable impurities.
The method of the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1035 ℃, 15 ℃ of section temperature differences;
2) be rolled: its start rolling temperature is controlled at 1015 ℃, and finishing temperature is controlled at 975 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 830 ℃;
4) weave silk postcooling to 605 ℃, its speed of cooling is controlled at 1.5 ℃/second.
Embodiment 4
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.23, Si:0.064, Mn:1.10, P:0.02, S:0.025, B:0.0022, N:0.0055, Ti:0.056, all the other are Fe and unavoidable impurities.
The method of the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1065 ℃, 10 ℃ of section temperature differences;
2) be rolled: its start rolling temperature is controlled at 1035 ℃, and finishing temperature is controlled at 980 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 845 ℃;
4) weave silk postcooling to 610 ℃, its speed of cooling is controlled at 1.8 ℃/second.
Embodiment 5
A kind of boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.19, Si:0.085, Mn:1.06, P:0.015, S:0.020, B:0.0025, N:0.00035, Ti:0.06, all the other are Fe and unavoidable impurities.
The method of the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1100 ℃, 5 ℃ of section temperature differences;
2) be rolled: its start rolling temperature is controlled at 1050 ℃, and finishing temperature is controlled at 990 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 820 ℃;
4) weave silk postcooling to 630 ℃, its speed of cooling is controlled at 2.0 ℃/second.
Through test, the mechanical property technical requirements of its steel grade and mechanical property in kind are relatively
Claims (4)
1. boracic cold heading wire rod steel, its chemical composition and weight percent are: C:0.18～0.23, Si:0.01～0.085, Mn:1.05～1.10, P :≤0.030, S :≤0.035, B:0.0006～0.0025, N :≤0.008, Ti:0.03～0.06, all the other are Fe and unavoidable impurities.
2. the method for the described a kind of boracic cold heading wire rod steel of production claim 1, its step:
1) continuously cast bloom is heated to 1000～1035 ℃, section temperature difference≤30 ℃;
2) be rolled: its start rolling temperature is controlled at 1000～1050 ℃, and finishing temperature is controlled at 960～990 ℃;
3) weave silk after the water-cooled, its laying temperature is controlled at 815～845 ℃;
4) weave silk postcooling to 580～630 ℃, its speed of cooling is controlled at 0.5～2.0 ℃/second.
3. the method for a kind of boracic cold heading wire rod steel of production as claimed in claim 2 is characterized in that: the speed of cooling in the step 4) is controlled at 1.0～1.5 ℃/second.
4. the method for a kind of boracic cold heading wire rod steel of production as claimed in claim 2 is characterized in that: in the step 4), and the postcooling to 590 of weaving silk～610 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100612882A CN101514429B (en) | 2009-03-27 | 2009-03-27 | Boracic cold heading wire rod steel and production method thereof |
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|---|---|---|---|
| CN2009100612882A CN101514429B (en) | 2009-03-27 | 2009-03-27 | Boracic cold heading wire rod steel and production method thereof |
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| CN101514429A CN101514429A (en) | 2009-08-26 |
| CN101514429B true CN101514429B (en) | 2011-03-30 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060675B (en) * | 2012-10-29 | 2016-08-10 | 马钢(集团)控股有限公司 | A kind of 05 grade high-strength nut anneal-free coil rod and production method thereof |
| CN103882304A (en) * | 2014-03-12 | 2014-06-25 | 张家港联峰钢铁研究所有限公司 | Method for producing ultralow-rigidity annealing-free cold forging steel |
| CN105063480B (en) * | 2015-08-25 | 2018-09-04 | 内蒙古包钢钢联股份有限公司 | A kind of production method of high intensity boron-containing cold heading steel |
| CN106734191A (en) * | 2016-12-26 | 2017-05-31 | 江苏省沙钢钢铁研究院有限公司 | It is a kind of to reduce the rolling mill practice that low-carbon boron-containing steel wire rod returns useless rate |
| CN109306435A (en) * | 2018-11-08 | 2019-02-05 | 邢台钢铁有限责任公司 | Non-quenched cold heading steel wire rod and preparation method thereof with good low temperature impact property |
| CN110358965B (en) * | 2019-07-02 | 2021-04-09 | 江阴兴澄合金材料有限公司 | Wire rod for 100-grade or above high-strength chain and manufacturing method thereof |
| CN112588842B (en) * | 2020-11-06 | 2023-04-28 | 邢台钢铁有限责任公司 | Production method of boron-containing steel wire rod |
| CN113684423B (en) * | 2021-10-26 | 2022-01-28 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod |
| CN115261729A (en) * | 2022-08-12 | 2022-11-01 | 河北普阳钢铁有限公司 | Method for producing fastener |
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| CN1745918A (en) * | 2004-09-07 | 2006-03-15 | 安阳钢铁集团有限责任公司 | Production of ultra-fine crystal hot-rolled ribbed reinforcing rob |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1745918A (en) * | 2004-09-07 | 2006-03-15 | 安阳钢铁集团有限责任公司 | Production of ultra-fine crystal hot-rolled ribbed reinforcing rob |
Non-Patent Citations (2)
| Title |
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| 唐修昌.SWRCH22A冷镦钢的开发与生产.江西冶金.2009,29(1),2-4. * |
| 范银平.ML20MnTiB高强度冷镦钢线材的研制与开发.金属制品.2009,35(1),42. * |
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