CN104087827A - Atmosphere-corrosion-resistant and low-temperature-impact-resistant high-specification angle steel and production method thereof - Google Patents
Atmosphere-corrosion-resistant and low-temperature-impact-resistant high-specification angle steel and production method thereof Download PDFInfo
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- CN104087827A CN104087827A CN201410336156.7A CN201410336156A CN104087827A CN 104087827 A CN104087827 A CN 104087827A CN 201410336156 A CN201410336156 A CN 201410336156A CN 104087827 A CN104087827 A CN 104087827A
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Abstract
The invention discloses atmosphere-corrosion-resistant and low-temperature-impact-resistant high-specification angle steel comprising the following components in percentage by weight (wt%): 0.15-0.20% of C, 0.2-0.5% of Si, 1.3-1.6% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, 0.05-0.08% of V, less than or equal to 0.005% of N, 0.015-0.035% of Nb, 0.001-0.007% of Ca, 0.001-0.002% of B and 0.015-0.035% of Als. The production method comprises the following steps of conventionally smelting and casting blanks; naturally stacking the cast blanks, and cooling to the room temperature; heating the cast blanks; carrying out coarse rolling; carrying out finish rolling; and naturally air cooling to the room temperature, and standing for later use. The angle steel produced by the invention has the impact power of larger than 75J at the low temperature of 40 DEG C below zero so as to meet the use requirement in any area in China; meanwhile, the angle steel is resistant to atmosphere corrosion; and in addition, the mechanical performance of the angle steel meets the requirement of national standard Q420, and the angle steel is favorable in surface quality and can be produced on a large scale under the condition that the traditional equipment does not need to be modified.
Description
Technical field
The present invention relates to a kind of low temperature resistant large-size high-tensile degree angle steel and production method thereof, specifically belong to large specification angle steel and the production method of a kind of atmospheric corrosion resistance and low-temperature impact-resistant, be specially adapted to large specification angle steel and production method that angle steel thickness is greater than atmospheric corrosion resistance and the low-temperature impact-resistant of 16mm.
Background technology
Electric power pylon is mainly used in electric power pylon construction with high-strength steel.Conventionally the rod shaped structure of timber structure, skeleton construction or steel pole structure is called to bar, the pyramidal structure of steel is called tower.Transmission tower is supporting overhead transmission line conductor and ground wire, and make between them and and the earth between distance under various possible atmospheric environments, meet electric insulation safety and the rod of power frequency electromagnetic field restriction and the structures of turriform.Along with the construction of high pressure, UHV transmission line and large-section lead transmitting line.Electric power pylon is to large load, large member future development.The very wide employing high-strength steel of the application prospect of high-strength steel can reduce member section.Reduce steel using amount, save engineering cost.Certain engineering adopts after Q420 high-strength steel, and tangent tower can reduce tower weight 4%～6%, and angle tower can reduce tower weight 4%～7%, and overall tower weight can reduce approximately 5%.Once promote high-strength corner iron, can effectively reduce steel tower design weight, saved material, significant to China's transmission line construction.
Along with economic great development, trans-regional power transmission becomes a kind of trend, because China is vast in territory, temperature variation is huge, the north, high Mountain area, plateau extreme temperature in winter is even lower than-40 DEG C, if steel tower is low and cause that brittle failure will have a strong impact on people's life and industrial production with steel Yin Wendu, the work simultaneously great development of industry makes Atmospheric components more complicated, more and more serious with steel corrosion to common steel tower, make so substantially all not reach in work-ing life of steel tower design reference period requirement, and at present about both low temperature resistant, the steel tower of atmospheric corrosion resistance uses angle steel there are no relevant report again, therefore urgent hope can be developed a kind of large angle steel of large-size high-tensile degree of low-temperature impact-resistant again can atmospheric corrosion resistance time, this steel has important economic and social benefit
Chinese Patent Application No. is the patent documentation of CN200910073969.0, a kind of high-strength Q 420 C level steel tower corner iron is disclosed, its chemical composition proportioning is: C 0.10～0.16%, Mn 1.15～1.45%, Si 0.30～0.50%, S, P≤0.025%, V 0.070～0.100%, Ti 0.004～0.010%, surplus Fe, Ceq≤0.42%.Its shortcoming is that this steel has only proposed the impelling strength requirement of 0 DEG C, the severe cold area that can not meet under lower temperature is used, this angle steel atmospheric corrosion resistance weak effect simultaneously, need to coordinate pot galvanize ability anticorrosion, and hot dip galvanizing process exists, environmental pollution is large, energy consumption is large, cost is high, invest the problems such as large.
Chinese Patent Application No. is the patent documentation of CN201310441360.0, a kind of electric power pylon low-temperature impact-resistant angle steel is disclosed, the weight percent of described angle steel chemical composition is: C:0.05～0.15%, Mn:1.20～1.60%, Si:0.01～0.05%, V:0.02～0.10%, Ni:0.02～0.06%, Ca:0.001～0.005%, Cr:0.01～0.20%, Cu:0.10～0.25%, P:0.01～0.03%, Mo:0.20～0.35%, S:0.005～0.02%, all the other are Fe.Its shortcoming is, this steel low-temperature impact-resistant meets-40 DEG C, but intensity is low, can not meet the use of large specification electric transmission pole tower, the angle steel that the method is produced simultaneously does not have atmospheric corrosion resistance effect, need to coordinate pot galvanize ability anticorrosion, and hot dip galvanizing process exists, environmental pollution is large, energy consumption is large, cost is high, invest the problems such as large.
Chinese Patent Application No. is the patent documentation of CN201210135125.6, the high-strength hot-rolled angle steel of a kind of anti-severe cold is disclosed, its component and weight percent content: C:0.06%～0.20%, Si:0.20%～0.50%, Mn:1.10%～1.50%, P≤0.015%, S≤0.010%, V:0.030%～0.070%, Nb:0.015%～0.050%, Ni:0.10%～0.60%, and meet CEV=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.40%; Its yield strength is greater than 550MPa, tensile strength >=680MPa, elongation after fracture >=24%, ballistic work >=55J at-40 DEG C.Its shortcoming is that C span of control exceedes 0.1%, causes CEV span of control also to exceed 0.1%, and performance inconsistency is large, and welding property is unstable, is unfavorable for construction; Its cooling rate narrow limits, is unfavorable for field control simultaneously; The angle steel that another the method is produced does not have atmospheric corrosion resistance effect, need to coordinate pot galvanize ability anticorrosion, and hot dip galvanizing process exists, environmental pollution is large, energy consumption is large, cost is high, invest the problems such as large.
Summary of the invention
The present invention is directed to the deficiency that above-mentioned prior art exists, provide a kind of and ensureing under the prerequisite of its mechanical property, and can significantly improve the large angle steel of large-size high-tensile degree and the production method of low-temperature impact and atmospheric corrosion resistance.
The application to achieve these goals, the alloying element and the technique that play impact or keying action on the object that realizes the application conduct in-depth research its result, even in order to ensure under the prerequisite of fundamental property, can also make angle steel low-temperature impact work at-40 DEG C be greater than 75J, also atmospheric corrosion resistance of while, and mechanical property meets the requirement of GB Q420, excellent surface quality, can produce in enormous quantities without transformation in the situation that in existing weaponry and equipment.Therefore proposed to adopt is mainly to have adopted raising V, Nb constituent content aspect composition, make to add niobium, vanadium can with steel in carbon, nitrogen-atoms form tiny carbide and carbonitride, these carbide and carbonitride are converted in the process of ferrite and pearlite and after changing and separate out gradually at austenite, play the effect of the room temperature texture of refinement reinforcing bar, and hinder the dislocation motion in lattice, produce the effect of precipitation strength, finally reach the obdurability that improves steel, the effect of V, Nb stack thinning microstructure and precipitation strength makes strengthening effect more remarkable; Secondly element boron, the titanium etc. of a small amount of raising low-temperature impact-resistant toughness have also been added, improve low-temperature impact toughness, and the content of a certain amount of phosphorus and rare earth element, can reach atmospheric corrosion resistance effect, by rare earth element to inclusion modification and cleaning action, and can not cause because phosphorus content is too high to impact and do not conform to problem; The optimization of composition, also need the technique of coupling, therefore, the application after deliberation, process aspect is mainly to have taked start rolling temperature to exist: 1000～1100 DEG C, finish rolling finishing temperature is the scope of 800～860 DEG C, object is that finishing temperature more approaches transformation temperature, the original austenite grains of steel billet is less, the austenite crystal that corresponding rolling is ended by rolling deformation is also less, thereby makes crystal grain obtain refinement, and over-all properties improves, also the precipitate that is conducive to vanadium and titanium is separated out more tiny and disperse simultaneously, so finishing temperature is at 800～860 DEG C.
Realize the measure of above-mentioned purpose:
The large specification angle steel of atmospheric corrosion resistance and low-temperature impact-resistant, its component and weight percent content are: C:0.15～0.20%, Si:0.2～0.5%, Mn:1.3～1.6%, P≤0.025%, S≤0.025%, V:0.05～0.08%, N≤0.005%, Nb:0.015～0.035%, Ca:0.001～0.007%, B:0.001～0.002%, Als:0.015～0.035%, all the other are Fe and impurity element.
Produce the method for the large specification angle steel of atmospheric corrosion resistance and low-temperature impact-resistant, its step:
1) conventional smelting and strand, controls tapping temperature at 1660～1690 DEG C, and Casting speed is not higher than 1.8m/min;
2) strand is carried out to nature stacking and be cooled to room temperature;
3), to strand heating, control soaking zone temperature is: 1050～1150 DEG C, heat-up time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1100 DEG C;
5) carry out finish rolling, control its finishing temperature 800 ~ 860 DEG C of scopes;
6) natural air cooling is stand-by to room temperature.
The effect of each element and master operation in the present invention
C: be to expand and stable austenite element, improve the most effective element of steel strength, also can improve the hot strength of high temperature steel, but when its content is lower than 0.15% time, thereby can cause mechanical property not enough and increase alloy addition level and increased production cost, when its content high by 0.20%, can produce plasticity and toughness decline, especially impelling strength obviously declines, and therefore, C of the present invention is chosen in 0.15 ~ 0.20%.
Si: be a kind of displacement strengthening element of cheapness, can significantly improve the intensity of steel, yield strength, but the low-temperature flexibility of Si meeting grievous injury steel, thus should not be too high, select the scope of Si 0.2～0.5%
Mn: be mainly the intensity that solid solution improves material in ferrite, it is again good reductor and sweetening agent, contain a certain amount of manganese and can eliminate or weaken the fragility causing because of sulphur, thereby improve the processing characteristics of steel, but when manganese too high levels, can make the tendency of grain coarsening, continuous casting and cooling control after rolling did not easily produce white point at that time, so select the scope of Mn 1.3～1.6%;
P, S: as harmful element, its content is more low better.S too high levels, can form a large amount of MnS and be mingled with, and reduces the mechanical property of steel, and therefore content is more low better, so select scope ≤0.025% of S; P, easily at grain boundary segregation, increases the fragility of reinforcing bar, and low temperature impact properties is declined to a great extent, and therefore content is more low better, so select scope ≤0.025% of P.
RE: rare earth purifies steel, rotten being mingled with, reduces spot corrosion and intergranular corrosion.In steel, solid solution rare earth improves polarization resistance and the corrosion potential of steel matrix, is conducive to improve the solidity to corrosion of steel matrix, changes the weave construction of rusty scale, forms the good rusty scale of good, the fine and close solidity to corrosion of adhesivity, has improved the solidity to corrosion of high-strength weathering steel.Content of rare earth exceedes certain value and just can play a role, thus through test, its content be difficult for lower than 0.02%, if but content higher than 0.1%, can roll up second-phase quantity in steel, bad to mechanical property, so range of choice is 0.02～0.1%.
B: add the performance that the boron of minute quantity can remarkably influenced material in steel, it suppresses P, S segregation and ruptures along brilliant, improve impact property, improve form and the distribution of inclusion, boron dissolves in sosoloid crystal lattice is distorted, boron on crystal boundary can stop again inclusion further to be grown up, make inclusion become tiny, rounding, is uniformly distributed in crystal boundary, strengthen crystal boundary, the toughness of material is improved.In the time that the content of boron is greater than 0.003%, it no longer increases with the increase of content the effect of steel, has increased on the contrary cost, and the manipulated variable of boron is in 0.001～0.002% scope
V: be microalloyed steel the most frequently used be also one of the most effective strengthening element.The effect of vanadium is tissue and the performance that affects steel by forming VN, V (CN), and it is mainly Precipitation in the ferrite of austenite grain boundary, refinement ferrite crystal grain, thereby intensity and the low-temperature flexibility of raising material.V is lower than 0.05% time, and precipitating reinforcing effect can not meet mechanical property requirements, and V is higher than 0.08% time, and precipitation strength makes intensity too high and cause toughness variation.
Nb: be strong carbide section bar element, Austenite Grain Growth can suppress hot rolling time, thinning microstructure, improve the comprehensive mechanical property of reinforcing bar, through test, if its Nb content is higher than 0.035% in this application, easily make precipitated phase thick and weaken precipitating reinforcing effect, and can significantly increase cost.Therefore range of choice Nb is 0.015～0.035%.
Al: be to determine nitrogen agent as the deoxidation in when steel-making, the N in Al and steel forms tiny indissoluble AlN particle, plays resistance inhibitor action, and then refinement ferrite crystal grain, Al content is too low, and refining effect is not obvious, Al too high levels, has reduced the mobility of molten steel, forms a large amount of Al
2o
3understand at nozzle clogging, thereby block the mouth of a river, thus select the scope of Al 0.015～0.035%,
Ca: can cleaning molten steel, improve the purity of steel, make the MnS nodularization of steel, the potential of performance material, when its too high levels, easily forms thick non-metallic inclusion, so range of choice is 0.001～0.007%.
Why adopt start rolling temperature to exist: 1000～1100 DEG C, finish rolling finishing temperature is the scope of 800～860 DEG C, object is that finishing temperature more approaches transformation temperature, the original austenite grains of steel billet is less, the austenite crystal that corresponding rolling is ended by rolling deformation is also less, thereby make crystal grain obtain refinement, and over-all properties improves, and the precipitate that is also conducive to vanadium, niobium is simultaneously separated out more tiny and disperse.
The present invention compared with prior art, the angle steel of producing low-temperature impact work at-40 DEG C is greater than 75J, meet the use in any region of China completely, also atmospheric corrosion resistance of while, and mechanical property meets the requirement of GB Q420, excellent surface quality, in the situation that can produce in enormous quantities without transformation in existing weaponry and equipment.
Brief description of the drawings
Fig. 1 is impact fracture shape appearance figure of the present invention;
Fig. 2 is the metallographic structure figure of the impact fracture pattern of Fig. 1;
Its impact that microfracture surface is all on whole section and wait axle dimple shape, large and dark dimple to distribute relatively evenly and quantity also more, inside large dimple, also having little dimple, demonstrate steel and there is higher toughness.
Embodiment
Below the present invention is described in detail:
Except the strand of embodiment 4 is of a size of 230 × 250mm, all the other all adopt the square billet of 200 × 200mm;
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation;
Table 4 is various embodiments of the present invention and comparative example atmospheric corrosion resistance the results list.
Various embodiments of the present invention are produced according to following steps:
1) conventional smelting and strand, controls tapping temperature at 1660～1690 DEG C, and Casting speed is not higher than 1.8m/min;
2) strand is carried out to nature stacking and be cooled to room temperature;
3), to strand heating, control soaking zone temperature is: 1050～1150 DEG C, heat-up time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1100 DEG C;
5) carry out finish rolling, control its finishing temperature 800 ~ 860 DEG C of scopes;
6) natural air cooling is stand-by to room temperature.
The chemical composition list (wt%) of table 1 embodiment of the present invention and comparative example
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
Note: the reference liquidus temperature of steel grade of the present invention is 1505 DEG C
The mechanical property contrast list of table 3 various embodiments of the present invention and comparative example
As can be seen from Table 3, at normal temperatures, mechanical property of the present invention is suitable with the reinforcement property of producing at present, but at-40 DEG C, it is significantly good in common contrast angle steel that steel toughness of the present invention is wanted, and can meet various places use in winter demand completely.
Table 4 is various embodiments of the present invention and comparative example atmospheric corrosion resistance the results list
Be processed into standard, under the environment of simulated atmosphere, carry out week soaking experiment, experimental solutions is 3% sodium pyrosulfate, soak on trier and test in F1-65 type week, adopt corrosion speed to characterize corrosion resistance, corrosion speed adopts weight-loss method to calculate, and its corrosion speed is lower, illustrates that its corrosion resistance is stronger.As can be seen from Table 4, test steel grade comparison of the present invention has more corrosion resistance than conventional angle steel.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. the large specification angle steel of atmospheric corrosion resistance and low-temperature impact-resistant, its component and weight percent content are: C:0.15～0.20%, Si:0.2～0.5%, Mn:1.3～1.6%, P≤0.025%, S≤0.025%, V:0.05～0.08%, N≤0.005%, Nb:0.015～0.035%, Ca:0.001～0.007%, B:0.001～0.002%, Als:0.015～0.035%, all the other are Fe and impurity element.
2. the method for the large specification angle steel of the atmospheric corrosion resistance described in production claim 1 and low-temperature impact-resistant, its step:
1) conventional smelting and strand, controls tapping temperature at 1660～1690 DEG C, and Casting speed is not higher than 1.8m/min;
2) strand is carried out to nature stacking and be cooled to room temperature;
3), to strand heating, control soaking zone temperature is: 1050～1150 DEG C, heat-up time is at 100 ~ 120min;
4) carry out roughing, and control its start rolling temperature and exist: 1000～1100 DEG C;
5) carry out finish rolling, control its finishing temperature 800 ~ 860 DEG C of scopes;
6) natural air cooling is stand-by to room temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104831190A (en) * | 2015-04-18 | 2015-08-12 | 罗光政 | Atmospheric-corrosion-resistant low-temperature-brittleness-resistant pre-embedded groove and production method thereof |
| CN110423948A (en) * | 2019-08-21 | 2019-11-08 | 莱芜泰铼经贸有限公司 | Low temperature resistant hot-rolled reinforced bar and its production method |
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| CN102676921A (en) * | 2012-05-04 | 2012-09-19 | 武汉钢铁(集团)公司 | Cold-resistant high-strength hot-rolled angle steel and production method thereof |
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| JPH07242939A (en) * | 1994-03-07 | 1995-09-19 | Nippon Steel Corp | Method for manufacturing high strength steel sheet having excellent low temperature toughness |
| CN101838768A (en) * | 2010-04-09 | 2010-09-22 | 武汉钢铁(集团)公司 | Low-temperature impact resistant steel for hot-rolling U-type steel sheet pile and production method thereof |
| CN102212752A (en) * | 2011-06-09 | 2011-10-12 | 中国电力科学研究院 | Low-temperature angle steel and manufacturing method thereof |
| CN102676921A (en) * | 2012-05-04 | 2012-09-19 | 武汉钢铁(集团)公司 | Cold-resistant high-strength hot-rolled angle steel and production method thereof |
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| CN104831190A (en) * | 2015-04-18 | 2015-08-12 | 罗光政 | Atmospheric-corrosion-resistant low-temperature-brittleness-resistant pre-embedded groove and production method thereof |
| CN110423948A (en) * | 2019-08-21 | 2019-11-08 | 莱芜泰铼经贸有限公司 | Low temperature resistant hot-rolled reinforced bar and its production method |
| CN110423948B (en) * | 2019-08-21 | 2021-05-18 | 莱芜泰铼经贸有限公司 | Low-temperature-resistant hot-rolled steel bar and production method thereof |
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