CN101509097A - Q460 level low alloy high-strength corner iron and production process - Google Patents
Q460 level low alloy high-strength corner iron and production process Download PDFInfo
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- CN101509097A CN101509097A CNA2009100739686A CN200910073968A CN101509097A CN 101509097 A CN101509097 A CN 101509097A CN A2009100739686 A CNA2009100739686 A CN A2009100739686A CN 200910073968 A CN200910073968 A CN 200910073968A CN 101509097 A CN101509097 A CN 101509097A
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Abstract
The invention relates to a low-alloy and high-strength Q460 level angle iron and a preparation method thereof, belonging to the technical field of steel making and aiming at enhancing strength and impact ductility of the angle iron applied to power system pylons. The angle iron is characterized in that mixture ratio of chemical compositions thereof is as follows: C: 0.13-0.19%, Mn: 1.30-1.50%, Si: 0.30-0.50%, S, P: less than or equal to 0.040%, V: 0.050-0.090%, and the balance of Fe and Ceq: less than or equal to 0.46%. In the preparation technique of the invention, VN microalloying mode of production is applied to steel making, continuous casting is in coordination with the wire-feeding process by a crystallizer and controlled rolling and cooling process is adopted, thus obtaining the angle iron with high strength and high impact ductility. Measurement indicators show that the product of the invention can meet the requirements of high strength and high impact ductility; applied to the preparation of power transmission and transformation pylons, the angle iron of the invention, while ensuring strength and toughness requirements, can reduce thickness and size of poles and pylons, save consumption of raw steel material and reduce self weight of the pylons.
Description
Technical field
Type of the present invention relates to a kind of Hi-Stren steel and production technique, and particularly yield strength 460Mpa level low alloy high-strength corner iron and production technique belong to the smelting iron and steel technical field.
Background technology
In recent years, along with rapid economic development, every profession and trade increases day by day to electricity needs, brings power transmission and transformation iron tower and the substation's steel construction peak with material thus.State Grid Corporation of China as an important behave that promotes the project of transmitting and converting electricity scientific-technical progress, reduces cost, clearly proposes will adopt the above rank angle steel of Q420B to the upgrading of iron tower intensity when applying the iron tower high-strength steel from now on.To this, satisfactory Hi-Stren steel is developed in the continuous research and inquirement of relevant iron and steel enterprise, also can be iron and steel enterprise simultaneously in the demand that satisfies power network development and has created good economic benefit.At present, the conventional smelting technology of Hi-Stren steel is a vanadium micro-alloying, its impelling strength of Hi-Stren steel of smelting according to this routine techniques is difficult to reach than high target, when using it for the manufacturing of electrical network power transmission and transformation iron tower, be proof strength and impelling strength requirement, need to increase the gauge with material, make the iron tower deadweight increase, cost increases.Therefore, the problem of needing solution for the Hi-Stren steel of making power grid iron tower badly is: when proof strength requires, improve impelling strength.
Summary of the invention
The present invention is intended to solve the defective of prior art and a kind of Q460 level low alloy high-strength corner iron and production technique that the power transmission and transformation iron tower has high strength, high impact toughness that be used for is provided.
The alleged problem of the present invention is solved by following technical scheme:
A kind of Q460 level low alloy high-strength corner iron, special feature are that the chemical ingredients proportioning is as follows: C 0.13～0.19%, and Mn 1.30～1.50%, and Si 0.30～0.50%, S, P≤0.040%, and V% 0.050～0.090, surplus Fe, Ceq≤0.46%.
Above-mentioned Q460 level low alloy high-strength corner iron, mechanical performance index is as follows:
Yield strength Rel:〉450Mpa
Tensile strength Rm:560～720Mpa
Elongation after fracture A: 〉=23%:
Impelling strength AKV: 〉=34J
180 ° of clod washes: d=2a during thickness a≤16mm; D=3a when thickness a is 16～35mm.
Above-mentioned Q460 level low alloy high-strength corner iron production technique, it comprises steel-making, continuous casting, rolling process, adopting the 80VN alloy to join V microalloying mode in the described steel making working procedure produces, the alloy addition sequence is Si-Mn, 80VN alloy, began to add the 80VN alloy at 1/3 o'clock in tapping, and in subsequent handling nitrogen blowing.
Above-mentioned Q460 level low alloy high-strength corner iron production technique, described continuous casting working procedure adopt crystallizer to feed aluminium wire technology, feeding φ 3mm aluminium-rare-earth core-spun yarn, and the continuously cast bloom pulling rate is 1.19-1.24m/min, feeding wire speed is 6～9m/min.
Above-mentioned Q460 level low alloy high-strength corner iron production technique, continuous blank heating temperature is even in the described rolling process, and the male and female face temperature head is not more than 50 ℃, and the heating zone temperature is no more than 1250 ℃, and start rolling temperature is less than 1150 ℃.
Provide the requirement of carbon equivalent in the main chemical compositions design of product 460 level low alloy high-strength corner irons of the present invention, thereby guaranteed the weldability of angle steel.Production technique of the present invention is produced in VN microalloying mode, and cooperates the crystallizer wire feeding process, obtains to have the angle steel of high strength, high impact toughness by cooling controlling and rolling controlling process.It adopts rational VN proportioning, reduces the microalloying cost; Adopt crystallizer to feed aluminium wire technology, can solve continuous casting and stop up big bag and middle water containing opening problem, make molten steel keep a certain amount of aluminium content again, guarantee the molten steel inclusion modification, reduce oxygen content in steel, refinement strand crystal grain, thereby guarantee the impact property of steel.Product of the present invention is used for the manufacturing of power transmission and transformation iron tower, under the prerequisite of proof strength and impelling strength requirement, can reduce the thickness and the size of shaft tower, saves rolled steel dosage, reduces the iron tower deadweight.
Embodiment
Principal feature of the present invention is embodied in following three aspects: break through " GB/T1591-1994 low-alloy high-tensile structural steel " and " YBT4163-2007 iron tower hot-rolled angle steel " standard in the composition proportion 1., provide the requirement of carbon equivalent, thereby guaranteed the weldability requirement of angle steel.
2. steel making working procedure adopts VN microalloying mode to produce.In general, N is deleterious element in steel, in the metallurgical production process of ferrous materials, unless adopt the refining of high cost to remove mode, otherwise be difficult to it is removed clean.Ordinary steel iron construction material, nitrogen element are assembled at tissue defects places such as crystal boundaries can produce aging phenomenon, and the intensity of steel is risen, and toughness descends.The solid N effect of V micro alloying element can be removed the aging phenomenon that the nitrogen element causes, while nitrogen pick-up in vanadium steel can promote the strengthening effect of vanadium, makes the precipitate disperse further of V, plays the effect of crystal grain thinning.In ferrous materials, V and N have an ideal stoicheiometry, promptly 1: 3.64.The 80VN alloy that the present invention adopts is joined the production of V microalloying, makes V, N than remaining on the stoichiometric(al) scope substantially.80VN is the commercially available prod, and the massfraction of vanadium is 80% in this alloy, the massfraction of nitrogen be 16% and the massfraction of carbon be 4%; The microalloying that utilizes 80VN to carry out steel is handled, given full play to the effect of nitrogen in steel, because 80VN alloy VN atomic ratio is stable, also has the reasonable component design, the specific absorption of adding V, N is stable, can guarantee V, N than remaining on the stoichiometric(al) scope substantially, not only refinement crystal grain but also avoid because of the nitrogen content timeliness that cause more.Improve the mechanical property of steel, also had good economic benefit.The high-strength angle steel intensity of producing with this method, impelling strength are apparently higher than the same specification product of conventional V microalloying.
3. when continuous casting working procedure unprotect cast measure, adopt crystallizer to feed aluminium wire; continuous casting be can solve and big bag and middle water containing opening problem stopped up; make molten steel keep a certain amount of aluminium content again; guarantee the molten steel inclusion modification, reduce oxygen content in steel, refinement strand crystal grain, thereby guarantee the impact property of steel.Stable, suitable feeding wire speed is the key of this operation.Feeding wire speed is by steel grade Al
sRequired amount, aluminium wire substance (specification), strand pulling rate, casting blank section decision.Above-mentioned parameter has following relation:
V
Hello=V
DrawMG/g
In the formula: V
Hello-aluminium wire feeding speed, m/min; V
Draw-casting speed, m/min;
M-strand substance, t/m; The G-aluminium add-on that requirement is set according to the steel grade aluminum content, g/t;
G-aluminium wire substance, g/m.
Consider continuous caster performance and base type, V
DrawBe controlled at 1.19-1.24m/min, determine V according to above formula
HelloAt 6～9m/min.
Several embodiment below are provided:
Table 1:Q460 level low alloy high-strength corner iron chemical ingredients (wt%) and rolling specs (mm)
| Embodiment | C | Mn | Si | S | P | V | Fe | Ceq | Rolling specs |
| 1 | 0.13 | 1.38 | 0.36 | 0.025 | 0.019 | 0.070 | Surplus | 0.38 | 160×14 |
| 2 | 0.16 | 1.40 | 0.41 | 0.027 | 0.027 | 0.080 | Surplus | 0.42 | 160×14 |
| 3 | 0.19 | 1.48 | 0.50 | 0.026 | 0.019 | 0.075 | Surplus | 0.46 | 160×14 |
| 4 | 0.15 | 1.30 | 0.35 | 0.030 | 0.024 | 0.050 | Surplus | 0.38 | 140×12 |
| 5 | 0.17 | 1.35 | 0.41 | 0.035 | 0.016 | 0.070 | Surplus | 0.42 | 140×12 |
| 6 | 0.18 | 1.45 | 0.37 | 0.022 | 0.020 | 0.085 | Surplus | 0.44 | 140×12 |
| 7 | 0.14 | 1.38 | 0.40 | 0.031 | 0.024 | 0.080 | Surplus | 0.39 | 125×10 |
| 8 | 0.19 | 1.50 | 0.30 | 0.022 | 0.020 | 0.090 | Surplus | 0.46 | 125×10 |
Main production of the present invention is as follows: the converter steelmaking operation is implemented high catch carbon, is forced deoxidation, adopts ladle deoxidation and alloying, and the Si-Mn alloy is joined Mn, and Si uses the Si-Ba-Ca final deoxygenation with the C-Si polishing, and regulation ton steel adds 1～1.2kg.Even for guaranteeing molten steel, fully remove and be mingled with, tapping whole process nitrogen blowing, and after having guaranteed out steel the bottom blowing time greater than 3 minutes.Adopt the 80VN alloy to join V, impact circulation effect for molten steel in the desoxydatoin that makes full use of ladle bottom Si-Mn alloy and the ladle, tap and began to add 80VN at about 1/3 o'clock, ton steel 1.21kg, the pays attention stably tap, can guarantee the add-on of V-N alloy, and in subsequent handling nitrogen blowing, to avoid the Local enrichment of N.Wrap liquid level in the continuous casting working procedure control, avoid down slag, determine pulling rate 1.19-1.24m/min according to the continuously cast bloom section.Adopt wire feeding process during continuous casting, feed φ 3mm aluminium-rare-earth core-spun yarn, the feeding wire speed of correspondence is selected 6～9m/min when pulling rate is 1.19-1.24m/min.Continuous blank heating temperature is even, and the male and female face temperature head is not more than 50 ℃, and the heating zone temperature is no more than 1250 ℃, and start rolling temperature is less than 1150 ℃.
The Q460 level low alloy high-strength corner iron mechanical property of Sheng Chaning sees Table 2 according to the method described above:
Table 2: each embodiment sample mechanical property
Claims (5)
1. Q460 level low alloy high-strength corner iron, it is characterized in that: the chemical ingredients proportioning is as follows: C 0.13～0.19%, and Mn 1.30～1.50%, and Si 0.30～0.50%, S, P≤0.040%, V% 0.050～0.090, surplus Fe, Ceq≤0.46%.
2. according to the described Q460 level low alloy high-strength corner iron of claim, it is characterized in that mechanical performance index is as follows: yield strength Rel:〉450Mpa
Tensile strength Rm:560～720Mpa
Elongation after fracture A: 〉=23%:
Impelling strength AKV: 〉=34J
180 ° of clod washes: d=2a during thickness a≤16mm; D=3a when thickness a is 16～35mm.
3. Q460 level low alloy high-strength corner iron production technique according to claim 1 and 2, it comprises steel-making, continuous casting, rolling process, it is characterized in that: adopt the 80VN alloy to join V microalloying mode in the described steel making working procedure and produce, the alloy addition sequence is Si-Mn, 80VN alloy, began to add the 80VN alloy at 1/3 o'clock in tapping, and in subsequent handling nitrogen blowing.
4. Q460 level low alloy high-strength corner iron production technique according to claim 3, it is characterized in that: described continuous casting working procedure adopts crystallizer to feed aluminium wire technology, feeding φ 3mm aluminium-rare-earth core-spun yarn, the continuously cast bloom pulling rate is 1.19-1.24m/min, feeding wire speed is 6～9m/min.
5. Q460 level low alloy high-strength corner iron production technique according to claim 4, it is characterized in that: continuous blank heating temperature is even in the described rolling process, the male and female face temperature head is not more than 50 ℃, and the heating zone temperature is no more than 1250 ℃, and start rolling temperature is less than 1150 ℃.
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| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102330023A (en) * | 2010-07-12 | 2012-01-25 | 马鞍山钢铁股份有限公司 | Steel for H steels at 500MPa level of yield strength and thermomechanical control process thereof |
| CN102345057A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength and toughness Q460E structural steel thick plate and production method thereof |
| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
| CN103911549A (en) * | 2014-04-26 | 2014-07-09 | 河北联合大学 | V-N microalloyed high-toughness large-specification steel angle and production method thereof |
| CN103938063A (en) * | 2014-04-04 | 2014-07-23 | 北京国网富达科技发展有限责任公司 | Preparation method of high-toughness Q345 grade hot-rolled equal angle steel for iron tower |
| CN104471098A (en) * | 2012-12-04 | 2015-03-25 | “奥穆特宁斯克冶金厂”封闭式股份公司 | Low-alloy, high-strength structural steel |
| CN105525209A (en) * | 2016-01-18 | 2016-04-27 | 内蒙古包钢钢联股份有限公司 | Low-yield-ratio Q460GJ construction steel plate and production method thereof |
| CN105734418A (en) * | 2016-03-11 | 2016-07-06 | 宣化钢铁集团有限责任公司 | Low-temperature-resistant hot-rolled angle steel and preparation method thereof |
| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
| CN111411304A (en) * | 2020-04-17 | 2020-07-14 | 南京钢铁股份有限公司 | Q460-grade hot-rolled angle steel and preparation method thereof |
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| CN102330023A (en) * | 2010-07-12 | 2012-01-25 | 马鞍山钢铁股份有限公司 | Steel for H steels at 500MPa level of yield strength and thermomechanical control process thereof |
| CN102080182A (en) * | 2010-12-27 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-strength steel plate Q460GJE-Z35 for extra-thick high-rise building structure and production method thereof |
| CN102345057A (en) * | 2011-06-28 | 2012-02-08 | 南阳汉冶特钢有限公司 | High strength and toughness Q460E structural steel thick plate and production method thereof |
| CN104471098A (en) * | 2012-12-04 | 2015-03-25 | “奥穆特宁斯克冶金厂”封闭式股份公司 | Low-alloy, high-strength structural steel |
| CN104471098B (en) * | 2012-12-04 | 2017-11-07 | Ao奥穆特宁斯克冶金厂 | Low-alloy high-tensile structural steel |
| EP2803749A4 (en) * | 2012-12-04 | 2015-05-06 | Closed Joint Stock Company Omutninsk Metallurg Plant | Low-alloy, high-strength structural steel |
| CN103074545A (en) * | 2013-02-05 | 2013-05-01 | 莱芜钢铁集团有限公司 | High-strength low temperature hot rolling resistant channel steel for forklift gantry and preparation method for channel steel |
| CN103938063A (en) * | 2014-04-04 | 2014-07-23 | 北京国网富达科技发展有限责任公司 | Preparation method of high-toughness Q345 grade hot-rolled equal angle steel for iron tower |
| CN103938063B (en) * | 2014-04-04 | 2016-03-30 | 北京国网富达科技发展有限责任公司 | A kind of preparation method of steel tower high tenacity Q345 level hot rolling equal angle steel |
| CN103911549A (en) * | 2014-04-26 | 2014-07-09 | 河北联合大学 | V-N microalloyed high-toughness large-specification steel angle and production method thereof |
| CN105525209A (en) * | 2016-01-18 | 2016-04-27 | 内蒙古包钢钢联股份有限公司 | Low-yield-ratio Q460GJ construction steel plate and production method thereof |
| CN105525209B (en) * | 2016-01-18 | 2017-12-26 | 内蒙古包钢钢联股份有限公司 | A kind of low yield strength ratio Q460GJ steel plate for building and its production method |
| CN105734418A (en) * | 2016-03-11 | 2016-07-06 | 宣化钢铁集团有限责任公司 | Low-temperature-resistant hot-rolled angle steel and preparation method thereof |
| CN109706403A (en) * | 2019-02-28 | 2019-05-03 | 辽宁科技学院 | A kind of Q460E steel plate and its rolling mill practice |
| CN111411304A (en) * | 2020-04-17 | 2020-07-14 | 南京钢铁股份有限公司 | Q460-grade hot-rolled angle steel and preparation method thereof |
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