CN101509099A - High-strength Q420C level steel tower corner iron and production process - Google Patents
High-strength Q420C level steel tower corner iron and production process Download PDFInfo
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- CN101509099A CN101509099A CNA2009100739690A CN200910073969A CN101509099A CN 101509099 A CN101509099 A CN 101509099A CN A2009100739690 A CNA2009100739690 A CN A2009100739690A CN 200910073969 A CN200910073969 A CN 200910073969A CN 101509099 A CN101509099 A CN 101509099A
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Abstract
The invention relates to a high tensile Q420C level angle iron applied to pylons and a manufacturing technique thereof, belonging to the technical field of steel making and aiming at improving 0 DEG C ballistic work 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: 0.01-0.16%, Mn: 1.15-1.45%, Si: 0.30-0.50%, S, P: less than or equal to 0.025%, V: 0.070-0.100%, Ti: 0.004-0.010%, and the balance of Fe and Ceq: less than or equal to 0.42%. In the manufacturing technique of the invention, VN microalloying mode of production is applied to steel making, ferrotitanium is added after deoxidation and alloying, Ca wire is fed to bale liquid steel prior to continuous casting and controlled rolling and cooling is carried out in the rolling process. Measurement indicators show that the steel of the invention meet the requirements for high strength, high impact ductility and 0 DEG C impact ductility; applied to manufacturing of power transmission and transformation pylons, the angle iron of the invention, while not reducing self weight of the pylons, improves safety factor of the pylons when being used in a low temperature environment.
Description
Technical field
Type of the present invention relates to a kind of angle steel and production technique, particularly high-strength Q 420 C level steel tower corner iron and production technique, belongs 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.Safety requirements increasing along with operation of power networks, especially after southern ice rain disaster in 2008 causes the iron tower big area to collapse, the C level angle steel that guarantees 0 ℃ of ballistic work is badly in need of Application and Development, to guarantee that improving iron tower load under identical tower weight condition provides effective high-strength steel grade support, do not improving the safety coefficient that the raising iron tower uses under the whole tower weight amount condition under low temperature environment, reduce the increase of construction investment and economize on resources raising iron tower safe class.Thus, the demand of Q420C level angle steel is urgent day by day.At present, producing Q420C level angle steel problem demanding prompt solution is that various inclusiones are more in the molten steel, and 0 ℃ of ballistic work of angle steel does not reach standard-required.
Summary of the invention
The present invention is intended to solve the defective of prior art and provides a kind of power transmission and transformation iron tower that is used for to have high strength, and can guarantee the high-strength Q 420 C level steel tower corner iron and the production technique of 0 ℃ of impact property.
The alleged problem of the present invention is solved by following technical scheme:
A kind of high-strength Q 420 C level steel tower corner iron, its special feature are that chemical ingredients is as follows by weight ratio: C 0.10～0.16%, and Mn 1.15～1.45%, Si 0.30～0.50%, S, P≤0.025%, and V 0.070～0.100%, Ti 0.004～0.010%, surplus Fe, Ceq≤0.42%.
Above-mentioned Q460 level low alloy high-strength corner iron, mechanical performance index is as follows:
Yield strength Rel:〉420Mpa
Tensile strength Rm:530～720Mpa
Elongation after fracture A: 〉=24%:
Impelling strength AKV (0 ℃): 〉=34J
180 ° of clod washes: d=2a during thickness a≤16mm; D=3a when thickness a is 16～35mm.
Above-mentioned high-strength Q 420 C level steel tower corner iron production technique, it comprises steel making working procedure, continuous casting working procedure, rolling process, adopt the VN alloy to join V microalloying mode in the described steel making working procedure and produce, began to add the 80VN alloy at 1/3 o'clock in tapping, and in subsequent handling nitrogen blowing.
Above-mentioned high-strength Q 420 C level steel tower corner iron production technique, described steel making working procedure add ferrotianium after deoxidation and alloying handles, and ferrotianium ton steel add-on is 1kg.
Above-mentioned high-strength Q 420 C level steel tower corner iron production technique is fed Ca line to big Baogang water before the continuous casting working procedure behind the described steel making working procedure, the Ca line 1-2m of ton steel feeding diameter 13mm, omnidistance argon bottom-blowing when feeding the Ca line, and after the assurance line feeding bottom blowing time greater than 7 minutes.
Above-mentioned high-strength Q 420 C level steel tower corner iron production technique, start rolling temperature in the described rolling process: 1100-1200 ℃; 800～950 ℃ of control finishing temperatures.
Product Q420C level steel tower corner iron of the present invention reduces C content lower limit for improving impact property and guaranteeing weldability in its main chemical compositions design, has adopted low Mn design simultaneously, and has provided the requirement of carbon equivalent.Production technique of the present invention adopts the high-quality molten iron, carries out hot metal pretreatment, produces in VN microalloying mode, and it adopts rational VN proportioning, reduces the microalloying cost; Add Ti in the steel, improve austenite recrystallization temperature, reduce perlite quantity, crystal grain thinning; Feed Ca line to big Baogang water before the continuous casting, can improve fluidity molten steel, the dross problem at the mouth of a river when solving continuous casting can guarantee the molten steel inclusion modification again, reduce oxygen content in steel, refinement strand crystal grain, thereby guarantees 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, guarantees 0 ℃ of impelling strength of angle steel, can not improve the safety coefficient that the raising iron tower uses under the whole tower weight amount condition under low temperature environment.
Embodiment
Principal feature of the present invention is embodied in following three aspects:
1. for improving impact property and guaranteeing weldability, 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, and provided the requirement of carbon equivalent.
2. steel making working procedure adopts the VN alloy to join vanadium, replaces conventional vanadium micro-alloying with v n micro alloying, and the VN steel is added the Ti processing.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 remain on the stoichiometric(al) scope than substantially, and 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%; Utilize 80VN (80%V, 16%N) microalloying that carries 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.
Austenitic alligatoring has the obvious suppression effect to the VN steel in the Ti processing, because N has formed the infusible TiN more than VN in the high-temperature zone with Ti, the repulsive force that has produced owing to the increase of grain boundary area and crystal boundary energy before having increased TiN and contacting with crystal boundary, and with the pinning effect power when mobile again after the interface contacts, thereby stoped the migration of crystal boundary.Ti handles the either pearlite occurred that can make the VN steel and reduces, and Ti handles the TiN that forms can enlarge ferritic generation zone on the CCT curve significantly, and makes it shift to short period of time one side.Ti combines meeting promotion V and combines production VC or V (C, N) with C with N in addition, the C that dissociates in the steel is reduced also can cause either pearlite occurred to descend.The present invention is controlled at 0.004～0.010% with the Ti add-on, and Ti content is very few, and the TiN of formation can not effectively stop the migration of crystal boundary less, does not have the effect of grain refining; Ti content is too much, can form the TiN particle of bulk and make the steel denitrogenation, these macrobeads TiN may damage the toughness and the anti-fatigue performance of steel, in addition, the avidity of Ti and O is big, and the titanyl compound that forms is mingled with easily, cause the waste of Ti alloy, increase production cost, not only do not played the effect of Ti alloying, also worsened the performance of steel.Ti content can produce the titanium nitride of small and dispersed at 0.004～0.010% o'clock, owing to stoped the alligatoring of recrystallize austenite, can make grain refining.
3. before continuous casting, feed Ca line to big Baogang water, to improve fluidity molten steel, the dross problem at the mouth of a river when solving continuous casting, the molten steel inclusion modification be can guarantee simultaneously again, oxygen content in steel, refinement strand crystal grain reduced, during line feeding omnidistance argon bottom-blowing and guarantee line feeding after the bottom blowing time greater than 7 minutes, large inclusions is fully floated, reduce the Inclusion In Steel thing, thereby guarantee the impact property of steel.
Several embodiment below are provided:
Table 1:Q420C level low alloy high-strength corner iron chemical ingredients (wt%) and rolling specs (mm)
| Embodiment | C | Mn | Si | S | P | V | Ti | Fe | Ceq | Rolling specs |
| 1 | 0.10 | 1.45 | 0.50 | 0.018 | 0.02 | 0.081 | 0.006 | Surplus | 0.37 | 160×12 |
| 2 | 0.15 | 1.15 | 0.39 | 0.016 | 0.018 | 0.072 | 0.004 | Surplus | 0.36 | 160×14 |
| 3 | 0.12 | 1.26 | 0.30 | 0.023 | 0.022 | 0.075 | 0.004 | Surplus | 0.35 | 160×14 |
| 4 | 0.15 | 1.29 | 0.50 | 0.018 | 0.022 | 0.078 | 0.008 | Surplus | 0.39 | 160×14 |
| 5 | 0.16 | 1.25 | 0.38 | 0.015 | 0.020 | 0.070 | 0.010 | Surplus | 0.39 | 160×14 |
| 6 | 0.13 | 1.33 | 0.43 | 0.017 | 0.016 | 0.100 | 0.005 | Surplus | 0.38 | 160×12 |
Main production of the present invention is as follows: adopt the high-quality molten iron, carry out hot metal pretreatment, select the high-quality scrap smelting for use.Terminal point composition (%): C is 0.06-0.10, S≤0.020, P≤0.015.Terminal temperature: first bag: 1700～1720 ℃, connect and water heat: 1660～1700 ℃.Adopt MnSi alloy, FeSi and SiAlFe alloy to carry out deoxidation alloying, look terminal point C content and adjust the FeSiAl add-on; Adopt the MnSi alloy to join manganese, supply with FeSi when silicon is not enough.
Adopt VN microalloying mode to produce, join vanadium, adopt the carburetting of low-sulfur carburelant with the 80VN alloy.Impact circulation effect for molten steel in the desoxydatoin that makes full use of ladle bottom Si-Mn alloy and the ladle, began to add the 80VN alloy at 1/3 o'clock in tapping, the ton steel adds 1.06kg, 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.
Add ferrotianium after the VN alloying, the ton steel adds 1kg.
Behind the converter smelting, before continuous casting, feed Ca line to big Baogang water, the Ca line 1-2m of ton steel feeding diameter 13mm, during line feeding omnidistance argon bottom-blowing and guarantee line feeding after the bottom blowing time greater than 7 minutes, it is exposed not allow molten steel to turn over greatly during bottom blowing.Continuous casting wraps liquid level stabilizing in keeping, and keeps pulling rate constant, fluctuation range ± 0.1m/min.
Control continuously cast bloom start rolling temperature: 1100-1200 ℃; 800-950 ℃ of control finishing temperature.
The Q420C 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 (6)
1. a high-strength Q 420 C level steel tower corner iron is characterized in that, the chemical ingredients proportioning is as follows: C 0.10～0.16%, and Mn 1.15～1.45%, Si 0.30～0.50%, S, P≤0.025%, and V 0.070～0.100%, Ti 0.004～0.010%, surplus Fe, Ceq≤0.42%.：
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:〉420Mpa
Tensile strength Rm:530～720Mpa
Elongation after fracture A: 〉=24%:
Impelling strength AKV (0 ℃): 〉=34J
180 ° of clod washes: d=2a during thickness a≤16mm; D=3a when thickness a is 16～35mm.
3. high-strength Q 420 C level steel tower corner iron production technique according to claim 1 and 2, it comprises steel making working procedure, continuous casting working procedure, rolling process, it is characterized in that: adopt the VN alloy to join V microalloying mode in the described steel making working procedure and produce, began to add the 80VN alloy at 1/3 o'clock in tapping, and in subsequent handling nitrogen blowing.
4. high-strength Q 420 C level steel tower corner iron production technique according to claim 3 is characterized in that: described steel making working procedure adds ferrotianium after deoxidation and alloying handles, and ferrotianium ton steel add-on is 1kg.
5. high-strength Q 420 C level steel tower corner iron production technique according to claim 4, it is characterized in that: feed Ca line to big Baogang water before the continuous casting working procedure behind the described steel making working procedure, the Ca line 1-2m of ton steel feeding diameter 13mm, omnidistance argon bottom-blowing when feeding the Ca line, and after guaranteeing line feeding the bottom blowing time greater than 7 minutes.
6. high-strength Q 420 C level steel tower corner iron production technique according to claim 5 is characterized in that: start rolling temperature in the described rolling process: 1100-1200 ℃; 800～950 ℃ of control finishing temperatures.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828115A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Medium plate Q345B and production method of same |
| 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 |
| CN106119689A (en) * | 2016-08-01 | 2016-11-16 | 唐山钢铁集团有限责任公司 | A kind of big specification Q420C hot rolling equal angle steel and production method thereof |
| CN107557652A (en) * | 2017-09-09 | 2018-01-09 | 衡水广厦铁塔制造有限公司 | A kind of processing technology of power tower steel |
| CN109487164A (en) * | 2018-12-13 | 2019-03-19 | 河钢股份有限公司 | Steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method |
| CN111636030A (en) * | 2020-05-29 | 2020-09-08 | 南京钢铁股份有限公司 | Q420C-grade hot-rolled angle steel and preparation method thereof based on machine learning |
| CN112746221A (en) * | 2020-12-25 | 2021-05-04 | 钢铁研究总院 | V-N microalloyed 550MPa hot-rolled thick-wall H-shaped steel and production process thereof |
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2009
- 2009-03-23 CN CNA2009100739690A patent/CN101509099A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102828115A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Medium plate Q345B and production method of same |
| 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 |
| CN106119689A (en) * | 2016-08-01 | 2016-11-16 | 唐山钢铁集团有限责任公司 | A kind of big specification Q420C hot rolling equal angle steel and production method thereof |
| CN107557652A (en) * | 2017-09-09 | 2018-01-09 | 衡水广厦铁塔制造有限公司 | A kind of processing technology of power tower steel |
| CN109487164A (en) * | 2018-12-13 | 2019-03-19 | 河钢股份有限公司 | Steel tower 420MPa grades of hot rolling weather-resisting angle steel of surrender and its production method |
| CN111636030A (en) * | 2020-05-29 | 2020-09-08 | 南京钢铁股份有限公司 | Q420C-grade hot-rolled angle steel and preparation method thereof based on machine learning |
| CN111636030B (en) * | 2020-05-29 | 2021-10-26 | 南京钢铁股份有限公司 | Q420C-grade hot-rolled angle steel and preparation method thereof based on machine learning |
| CN112746221A (en) * | 2020-12-25 | 2021-05-04 | 钢铁研究总院 | V-N microalloyed 550MPa hot-rolled thick-wall H-shaped steel and production process thereof |
| CN112746221B (en) * | 2020-12-25 | 2021-10-15 | 钢铁研究总院 | V-N microalloyed 550MPa hot-rolled thick-wall H-shaped steel and production process thereof |
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