CN103484765B - Low temperature resistant H profile steel of think gauge for railway contact line pillar and preparation method thereof - Google Patents

Low temperature resistant H profile steel of think gauge for railway contact line pillar and preparation method thereof Download PDF

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CN103484765B
CN103484765B CN201310415949.3A CN201310415949A CN103484765B CN 103484765 B CN103484765 B CN 103484765B CN 201310415949 A CN201310415949 A CN 201310415949A CN 103484765 B CN103484765 B CN 103484765B
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steel
rolling
low temperature
temperature resistant
profile steel
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CN103484765A (en
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韩蕾蕾
李超
邹春锋
袁鹏举
付常伟
武玉利
杨栋
尹德全
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Laiwu Iron and Steel Group Co Ltd
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Abstract

The invention discloses a kind of think gauge for pillar of electrification rail contacting net (edge of a wing thickness >=28mm) low temperature resistant H profile steel and preparation method thereof, the weight percentage of the chemical composition of described low temperature resistant H profile steel is: C0.10 ~ 0.22%, Si0.10 ~ 0.40%, Mn0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb0.02 ~ 0.05%, Ti0.003-0.015%, and all the other are iron and trace impurity.

Description

Low temperature resistant H profile steel of think gauge for railway contact line pillar and preparation method thereof
Technical field
The present invention relates to low temperature resistant H profile steel of a kind of think gauge and preparation method thereof, be specifically related to a kind of think gauge for pillar of electrification rail contacting net (edge of a wing thickness >=28mm) low temperature resistant H profile steel and preparation method thereof.
Background technology
Railway is the current of paramount importance mode of transportation of China, and electric railway mode of transportation is the main flow of whole world track traffic, and electric locomotive is without waste gas, flue dust, and to free of air pollution, noise is less in addition, and comfort level is high.China railway realizes the important goal that electrification is railway development, and electric railway uses electric locomotive as traction power, and locomotive does not install primover, and required electric energy is provided by electric railway power supply system of electric traction.Along the both sides of railway line, set up row's pillar, suspended on metal wire above, be contact system, it also can be counted as the artery of electric railway.Electric locomotive utilizes the pantograph of roof to obtain electric energy from contact system.But, in some high latitude (or High aititude) area, such as the Northeast of China, because area is long and narrow, each side's traffic is all inconvenient, and winter temperature lower (minimum temperature is about-40 DEG C), need to overcome a series of low temperature resistant condition material limits so electric railway is built.
Under normal conditions, GB H profile steel specification coverage rate is H (100 ~ 1000) × (50 ~ 500) × (3.2 ~ 45) × (7 ~ 40), totally 118 specifications, the specification of production domesticization is (H (100 ~ 900) × (50 ~ 400) × (3.2 ~ 20) × (7 ~ 40)), wherein, web thickness >=28mm only has 5 specifications, only account for 4.23% of all specifications, and H profile steel performance sample must sample from leg, be limited to mill capacity, ultra thick gauge H profile steel can only use Hot Metal in Beam Blank rolling usually.For the think gauge H profile steel manufacturing edge of a wing thickness >=28mm; Hot Metal in Beam Blank specification and the trimmed size of use are close; use tip, the edge of a wing thickness≤80mm rolling of casting for shaped blank continuous base, performance position leg compression than being < 3; rolling reduction is very little; die break degree is low; crystal grain after rolling recovers recrystallize and easily causes coarse grains; final product thickness is large; thermograde is larger in a thickness direction; grain size and homogeneity of structure are difficult to control, and have a strong impact on the low-temperature performance of steel.Thus be difficult to use conventional methods and manufacture.
CN101255773B Chinese invention patent discloses pillar of electrification rail contacting net dress H profile steel and preparation method thereof, this invention product is according to the load of catenary mast and distribution size cases, design and meet domestic electric railway service requirements catenary mast Special H section steel, save material, but it uses common material Q235B, does not possess low temperature resistant feature, under therefore can not using it for low temperature environment.
CN102021475 Chinese invention patent application discloses a kind of hot-rolled H-shaped steel for low temperature-resisting structure and preparation method thereof, the method adopts vanadium micro-alloying and roll control means, in the method, the soaking temperature of process furnace is 1240 ~ 1270 DEG C, start rolling temperature is 1170 DEG C outside the edge of a wing, be 1150 DEG C in web central authorities, finishing temperature is 950 DEG C outside the edge of a wing, be 830 DEG C in web central authorities, stocking is at cold bed naturally cooling, and the specification of stocking is H300 × 300H shaped steel.The H profile steel edge of a wing thickness related in this specification is the thickest is 15mm, and low-temperature performance is easy to realize.This H profile steel-20 DEG C of low-temperature impact work mean values are 90J in addition, are difficult to use in the occasion higher to low-temperature impact work requirement, and can not use in for the low temperature resistant H profile steel of think gauge of pillar of electrification rail contacting net.Therefore, need to provide a kind of low temperature resistant H profile steel of think gauge that can be used in pillar of electrification rail contacting net.
Summary of the invention
An aspect of of the present present invention is to provide low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net and preparation method thereof.This H profile steel can have can bear strong impact force and fatigue proof feature under low temperature environment and blast air, therefore can be used for the pillar of electrification rail contacting net under low temperature environment (such as, high latitude or high altitude localities).
An aspect of of the present present invention provides the low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net, it is characterized in that the weight percentage of the chemical composition of described low temperature resistant H profile steel is: C0.10 ~ 0.22%, Si0.10 ~ 0.40%, Mn0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb0.02 ~ 0.05%, Ti0.003-0.015%, all the other are iron and trace impurity.
According to an aspect of the present invention, the weight percentage of the chemical composition of the low temperature resistant H profile steel of described think gauge is: C0.11 ~ 0.14%, Si0.10 ~ 0.20%, Mn0.80 ~ 1.00%, P≤0.015%, S≤0.005%, Nb0.04 ~ 0.05%, Ti0.005 ~ 0.010%, and all the other are iron and trace impurity.
Another aspect provides the preparation method of the low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net, described preparation method comprises molten iron pre-desulfurization, converter smelting, LF refining, casting for shaped blank continuous, rolling, it is characterized in that the method comprises the steps:
1) molten iron pre-desulfurization: ensure after desulfurization that the sulphur content in molten iron is≤0.010wt%;
2) converter smelting: adopt top and bottom combined blown converter smelting; Put the employing of steel process and melt deslagging process purify hot metal in advance;
3) LF stove refining: first fully stirringization slag in refining process, makes yellowish-white slag, further removes steel water oxygen, sulphur content, and feed appropriate titanium wire in the refining later stage;
4) casting for shaped blank continuous: adopt and add sleeve-like manner molding casting between tundish and beam blank mould;
5) process furnace insulation: one, interval shove charge in process furnace, heating soaking zone temperature is 1220 DEG C-1290 DEG C, soaking time 1 ~ 1.5 hour;
6) rolling: adopt 9 ~ 14 passes methods, TM start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, extreme trace time edger roll draft is greater than 10%, and wherein, described 9 ~ 14 passes comprise roughing rolling 5 ~ 9 passage and finish rolling rolling 3 ~ 7 passage.
Wherein, the weight percentage of the chemical composition of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of preparation is C0.10 ~ 0.22%, Si0.10 ~ 0.40%, Mn0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb0.02 ~ 0.05%, Ti0.003 ~ 0.015%, and all the other are iron and trace impurity.
According to an aspect of the present invention, the weight percentage of the chemical composition of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of preparation is: C0.11 ~ 0.14%, Si0.10 ~ 0.20%, Mn0.80 ~ 1.00%, P≤0.015%, S≤0.005%, Nb0.04 ~ 0.05%, Ti0.005 ~ 0.010%, all the other are iron and trace impurity.
According to a further aspect in the invention, in converter smelting step, red-face role's ladle that ladle adopts bottom blowing good, storing temperature >=800 DEG C; Employing high carbon ferromanganese, ferro-niobium carry out alloying, and alloying constituent controls by middle limit; Adopt Si-Ca-Ba deoxidation, add-on 2.5 ~ 3.5kg/t steel; Add in tapping process and melt slag 3-4kg/t steel in advance, when molten steel go out to 1/4 time start evenly to add alloy, molten steel go out to 3/4 time add, alloy aim at steel stream impact zone add.
According to another aspect of the invention, LF stove refinement step feeds CaFe line before also comprising refining soft blow argon, and CaFe line feed quantity is 0.25-0.4kg/t steel; Keeping the little argon gas amount of top of the slag fine motion to stir more than 12min after refining, wherein, keeping the little argon gas amount of top of the slag fine motion for being 50-100NL/min.
According to another aspect of the invention, in continuous casting step, baking of tundish temperature is 1100-1150 DEG C, crystallizer is to arc, use submerged nozzle full guard molding casting, wherein, two cold employings are weak cold, crystallizer adopts non-sinusoidal oscillation, tundish adopts low-carbon (LC) alkaline covering agent, insulating covering agent add-on is 1 ~ 1.5kg/t steel, liquidus temperature is 1518 DEG C, tundish superheating temperature is by 20 ~ 30 DEG C of controls, middle bag first furnace temperature controls at 1543 ~ 1553 DEG C, even watering heat controls at 1538 ~ 1548 DEG C, casting blank specification is 555mm × 440mm × 90mm, pulling rate is 0.8 ~ 0.9m/min.
In accordance with a further aspect of the present invention, in milling step, the soaking temperature of process furnace is 1220 ~ 1290 DEG C, start rolling temperature is 1150 ~ 1230 DEG C outside the edge of a wing, be 1100 ~ 1200 DEG C in web central authorities, finishing temperature is 750 ~ 820 DEG C outside the edge of a wing, be 650 ~ 750 DEG C in web central authorities, stocking is at cold bed naturally cooling.
According to another aspect of the invention, in LF stove refinement step, the feed quantity of Ti line is 0.25 ~ 0.65kg/t steel.
Embodiment
Hereinafter, describe the present invention in detail with reference to example embodiment, but, it will be appreciated by those skilled in the art that concrete example given below is only illustrative, instead of for restrictive object.There is provided these embodiments to make the disclosure to be thoroughly with complete, and scope of the present invention will be supplied to those skilled in the art fully.
The present invention is mainly for the problem in the composition of the low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net, smelting and the operation of rolling, provide a kind of low temperature resistant H profile steel for pillar of electrification rail contacting net and preparation method thereof, product good mechanical properties of the present invention, yield strength can reach average 350MPa, the mean value of tensile strength can be 455MPa,-20 DEG C of impact of collision merits can reach average 195J, and-40 DEG C of impact of collision merits can reach mean value 119J.
The present invention is mainly through reducing sulphur, phosphorus content, carbon and manganese content reasonable in design, and microalloying mainly applies niobium, titanium compound, does not add other element.According to the embodiment of the present invention, the weight percentage of the chemical composition of the low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net is: C0.10 ~ 0.16%, Si0.10 ~ 0.30%, Mn0.8 ~ 1.10%, P≤0.020%, S≤0.010%, Nb0.02 ~ 0.04%, Ti0.003 ~ 0.015%, all the other are iron and trace impurity.
Feature of the present invention is that P, S content is low, and on the basis only using micro-Nb, Ti, use the method for production technology optimization, when rolling reduction is minimum, produce the low temperature resistant H profile steel of think gauge for pillar of electrification rail contacting net with comparatively economic means.
Alternatively, weight percentage according to the chemical composition of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of the present invention is preferably: C0.11 ~ 0.14%, Si0.10 ~ 0.20%, Mn0.80 ~ 1.00%, P≤0.015%, S≤0.005%, Nb0.04 ~ 0.05%, Ti0.005-0.0010%, all the other are iron and trace impurity.
According to embodiments of the invention, the preparation method of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net can comprise desulfurization, converter smelting (such as, 120 tons of top and bottom combined blown converter smeltings), LF refining, casting for shaped blank continuous, rolling (such as, the rolling of 1-3 milling train layout pattern production line).
Specifically, according in the preparation method of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of the embodiment of the present invention, converter adopts when putting steel melts deslagging process reduction inclusion content in melting steel content in advance, the LF refining later stage feeds appropriate titanium wire, casting process adopts casing protection pouring type, special load mode is used in process furnace, and 1 ~ 1.5 hour is incubated between 1220 DEG C ~ 1290 DEG C, roughing adopts 9 passes, finish rolling adopts 5 passes, finish rolling start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, extreme trace time edger roll draft >=10%.In addition, due to the complicacy of special-shaped billet continuous casting machine, so can not aluminium deoxidation be adopted according to the preparation method of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of the embodiment of the present invention.
More particularly: the preparation method according to the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of the present invention can comprise following operation (step):
1) molten iron pre-desulfurization: ensure after desulfurization that the sulphur content in molten iron is≤0.010wt%;
2) converter smelting: adopt top and bottom combined blown converter smelting; Put the employing of steel process and melt deslagging process purify hot metal in advance;
3) LF stove refining: first fully stirringization slag in refining process, makes yellowish-white slag, further removes steel water oxygen, sulphur content, and feed appropriate titanium wire in the refining later stage;
4) casting for shaped blank continuous: adopt and add sleeve-like manner molding casting between tundish and beam blank mould;
5) process furnace insulation: one, interval shove charge in process furnace, heating soaking zone temperature is 1220 DEG C-1290 DEG C, soaking time 1 ~ 1.5 hour;
6) rolling: adopt 9 ~ 14 passes methods, finish rolling start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, extreme trace time edger roll draft is greater than 10%, and wherein, described 9 ~ 14 passes comprise roughing rolling 5 ~ 9 passage and finish rolling rolling 3 ~ 7 passage.
In addition, the NM operation of the present invention, all can adopt prior art.Those skilled in the art can grasp the concrete methods of realizing of these operations, therefore for clarity and brevity, here will no longer repeat.
Below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not limited thereto.
According to one embodiment of present invention, the operational path of the preparation method of the low temperature resistant H profile steel of a kind of think gauge for pillar of electrification rail contacting net is:
Molten iron pre-desulfurization → converter smelting → LF refining → casting for shaped blank continuous → 1-3 milling train layout pattern production line rolling → inspection warehouse-in.
The measure of preparation method's main technique can comprise:
(1) molten iron is to desulfurization station, ensures that the sulphur content in molten iron is≤0.010wt% after desulfurization.
(2) converter smelting: feed stock for blast furnace must meet following requirement: sulfur content of hot metal≤0.010%; Adopt the low rifle bit manipulation of the large quantity of slag, converting process, slag charge (adds 2/3 slag charge in the first batch) in two batches and adds, and omnidistance bitsization are good, change is saturating.Red-face role's ladle that ladle can adopt bottom blowing good, storing temperature >=800 DEG C.Adopt high carbon ferromanganese (such as, FeMn 65c 6.3), ferro-niobium carries out alloying.Require that alloy is clean, dry.Adopt Si-Ca-Ba deoxidation, add-on 2.5 ~ 3.5kg/t steel.Add in tapping process and melt slag 3-4kg/t steel in advance.When molten steel go out to 1/4 time start evenly, add high carbon ferromanganese, Si-Ca-Ba, ferrocolumbium successively, molten steel go out to 3/4 time add, alloy is aimed at steel stream impact zone and is added.But the present invention is not limited thereto, those skilled in the art can select suitable compound or composition as melting slag in advance according to actual needs, as long as component content meets the requirements.
(3) LF refining: carry out refining at LF ladle, in refining process, first fully stirringization slag, makes yellowish-white slag, then gets a sample and carry out composition total analysis, rear feeding 0.25-0.65kg/t steel Ti line.According to the result that secondary sample is analyzed, carry out trimming, before refining soft blow argon, feed CaFe line 0.25-0.4kg/t steel.The little argon gas amount of top of the slag fine motion is kept to stir more than 12 minutes after refining.The little argon gas amount of described fine motion refers to that argon flow amount is 50-100NL/min.
(4) continuous casting: baking of tundish temperature is 1100-1150 DEG C, crystallizer is to arc, and mouth of a river centering meets the requirements, and water coolant is respond well.Two cold employings are weak cold.Crystallizer adopts non-sinusoidal oscillation.Tundish adopts low-carbon (LC) alkaline covering agent, and add-on performs according to 1 ~ 1.5kg/t steel.Liquidus temperature is 1518 DEG C, and tundish superheating temperature is by 20 ~ 30 DEG C of controls, and middle bag first furnace temperature controls at 1543 ~ 1553 DEG C, even waters heat and controls at 1538 ~ 1548 DEG C.Continuous caster is machine three stream, and casting blank specification is 555mm × 440mm × 90mm, and pulling rate is 0.8 ~ 0.9m/min.
(5) soaking temperature of process furnace is 1220 ~ 1290 DEG C, start rolling temperature is 1150 ~ 1230 DEG C outside the edge of a wing, be 1100 ~ 1200 DEG C in web central authorities, finishing temperature is 820 DEG C outside the edge of a wing, be 750 DEG C in web central authorities, stocking does not carry out water-cool control after going out finishing mill, at cold bed naturally cooling.According to one embodiment of present invention, the specification of stocking is H270*248*18*32 shaped steel.But the present invention is not limited thereto, the preparation method of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of the present invention also may be used for the stocking of other think gauge of rolling.
(6) the chemical component weight per-cent of steel is in table 1, and converter steelmaking process recorder is in table 2, and refining process recorder is in table 3, and casting process recorder is in table 4, and stocking mechanical property recorder is in table 5.
Table 1: the chemical component weight per-cent % of steel
Embodiment C Si Mn P S Nb Ti
1 0.128 0.23 0.98 0.013 0.003 0.025 0.007
2 0.119 0.25 0.99 0.012 0.005 0.045 0.008
3 0.138 0.21 1 0.014 0.004 0.029 0.006
4 0.115 0.23 1 0.016 0.004 0.043 0.010
Table 2 converter steelmaking process recorder
Table 3: casting process recorder
Table 4: operation of rolling recorder
Table 5: stocking mechanical property recorder
In preferred 2,4 embodiments, Nb content is 0.04-0.05, and in this case, the Grain refinement with the steel of this composition is particularly evident, and the homogeneity of structure of steel is higher, and the low temperature impact properties obtained is more excellent.
Compare with low temperature resistant H profile steel of the prior art, the feature of the low temperature resistant H profile steel for pillar of electrification rail contacting net of the present invention is:
1. the strand produced is large-sized special-shaped base, in low cost situation, uses microalloy and controlled rolling temperature control technique, produces the high strength railway catenary mast Special H section steel of resistance to-40 DEG C of low temperature;
2. product uses optimization composition to add micro-Nb alloy, and add trace Ti alloy, both the strand crack sensitivity of Hot Metal in Beam Blank can have been reduced, significantly improve cc billet surface quality, can guarantee that again Nb alloy plays a role completely, the continuous and stable production of resistance to think gauge low temperature resistant electrification railway contact net pillar Special H section steel can be realized;
3. resistance to low temperature of the present invention is good, and-40 DEG C of ballistic works on average can reach 116J.
4. steel low-temperature performance and steel grade titanium content have certain corresponding relation, and along with the increase of titanium content, the ductile-brittle transition temperature of steel significantly reduces.
The present invention adopts niobium titanium to meet microalloying technique, adds appropriate titanium, makes it form the compound of particular type, and utilize this precipitate precipitation strength and nail slag mechanism, make the more refinement of its crystal grain, homogeneity of structure significantly improves, and realization effect maximizes.In addition, the present invention is in the operation of rolling, have employed, compared with the rolling temperature for the low temperature resistant shaped steel of rolling of the prior art, there is the rolling temperature significantly distinguished, such as, in rolling method of the present invention, finishing temperature, lower than 820 DEG C, is starkly lower than the finishing temperature of (such as CN102021475 Chinese patent application) in prior art.Can obviously find out by comparing each embodiment, by improving composition and/or the adjustment operation of rolling, the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net obtained can overcome the shortcoming of low temperature resistant H profile steel of the prior art, can produce the think gauge H profile steel for pillar of electrification rail contacting net being suitable for low temperature environment, and this H profile steel has excellent resistance to low temperature.
Although describe the present invention in conjunction with specific exemplary embodiment, but above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although with reference to above-described embodiment to invention has been detailed description, but those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, and not departing from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (9)

1. the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net, it is characterized in that the weight percentage of the chemical composition of described low temperature resistant H profile steel is: C 0.10 ~ 0.22%, Si 0.10 ~ 0.40%, Mn 0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb 0.02 ~ 0.05%, Ti0.003-0.015%, all the other are iron and trace impurity, wherein, edge of a wing thickness >=the 28mm of the low temperature resistant H profile steel of described think gauge, wherein, the method manufacturing described low temperature resistant H profile steel comprises molten iron pre-desulfurization, converter smelting, LF refining, casting for shaped blank continuous and rolling, in rolling technology, adopt 9 ~ 14 passes, finish rolling start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, extreme trace time edger roll draft is greater than 10%, wherein, described 9 ~ 14 passes comprise roughing rolling 5 ~ 9 passage and finish rolling rolling 3 ~ 7 passage.
2. the low temperature resistant H profile steel of think gauge as claimed in claim 1, it is characterized in that the weight percentage of the chemical composition of described low temperature resistant H profile steel is: C 0.11 ~ 0.14%, Si 0.10 ~ 0.20%, Mn 0.80 ~ 1.00%, P≤0.015%, S≤0.005%, Nb 0.04 ~ 0.05%, Ti 0.005 ~ 0.010%, all the other are iron and trace impurity.
3., for a preparation method for the low temperature resistant H profile steel of think gauge of pillar of electrification rail contacting net, described preparation method comprises molten iron pre-desulfurization, converter smelting, LF refining, casting for shaped blank continuous, rolling, it is characterized in that,
1) molten iron pre-desulfurization: ensure after desulfurization that the sulphur content in molten iron is≤0.010wt%;
2) converter smelting: adopt top and bottom combined blown converter smelting; Put the employing of steel process and melt deslagging process purify hot metal in advance;
3) LF stove refining: first fully stirringization slag in refining process, makes yellowish-white slag, further removes steel water oxygen, sulphur content, and feed appropriate titanium wire in the refining later stage;
4) casting for shaped blank continuous: adopt and add sleeve-like manner molding casting between tundish and beam blank mould;
5) process furnace insulation: one, interval shove charge in process furnace, heating soaking zone temperature is 1220 DEG C-1290 DEG C, soaking time 1 ~ 1.5 hour;
6) rolling: adopt 9 ~ 14 passes methods, finish rolling start rolling temperature≤900 DEG C, finishing temperature≤820 DEG C, extreme trace time edger roll draft is greater than 10%, and wherein, described 9 ~ 14 passes comprise roughing rolling 5 ~ 9 passage and finish rolling rolling 3 ~ 7 passage,
Wherein, the weight percentage of the chemical composition of the low temperature resistant H profile steel of the think gauge for pillar of electrification rail contacting net of preparation is: C 0.10 ~ 0.22%, Si 0.10 ~ 0.40%, Mn 0.5 ~ 1.1%, P≤0.020%, S≤0.010%, Nb 0.02 ~ 0.05%, Ti 0.003-0.015%, all the other are iron and trace impurity, wherein, the edge of a wing thickness >=28mm of the low temperature resistant H profile steel of described think gauge.
4. preparation method as claimed in claim 3, it is characterized in that the weight percentage of the chemical composition of the low temperature resistant H profile steel for pillar of electrification rail contacting net prepared is: C 0.11 ~ 0.14%, Si0.10 ~ 0.20%, Mn 0.80 ~ 1.00%, P≤0.015%, S≤0.005%, Nb 0.04 ~ 0.05%, Ti 0.005-0.010%, all the other are iron and trace impurity.
5. preparation method as claimed in claim 3, is characterized in that in converter smelting step,
Red-face role's ladle that ladle adopts bottom blowing good, storing temperature >=800 DEG C;
Employing high carbon ferromanganese, ferro-niobium carry out alloying, and alloying constituent controls by middle limit;
Adopt Si-Ca-Ba deoxidation, add-on 2.5 ~ 3.5kg/t steel;
Add in tapping process and melt slag 3-4kg/t in advance steel, when molten steel go out to 1/4 time start evenly to add alloy, molten steel go out to 3/4 time add, alloy aim at steel stream impact zone add.
6. preparation method as claimed in claim 3, it is characterized in that LF stove refinement step feeds CaFe line before also comprising refining soft blow argon, CaFe line feed quantity is 0.25-0.4kg/t steel, keep the little argon gas amount of top of the slag fine motion to stir more than 12 minutes after refining,
Wherein, the little argon gas amount of top of the slag fine motion is kept to be 50-100NL/min.
7. preparation method as claimed in claim 3, it is characterized in that in continuous casting step, baking of tundish temperature is 1100-1150 DEG C, and crystallizer, to arc, uses submerged nozzle full guard molding casting,
Wherein, two cold employings are weak cold, and crystallizer adopts non-sinusoidal oscillation, and tundish adopts low-carbon (LC) alkaline covering agent, and insulating covering agent add-on is 1 ~ 1.5kg/t steel, liquidus temperature is 1518 DEG C, and tundish superheating temperature is by 20 ~ 30 DEG C of controls, and tundish first furnace temperature controls at 1543 ~ 1553 DEG C, and even water heat and control at 1538 ~ 1548 DEG C, casting blank specification is 555mm × 440mm × 90mm, and pulling rate is 0.8 ~ 0.9m/min.
8. preparation method as claimed in claim 3, it is characterized in that in milling step, the soaking temperature of process furnace is 1220 ~ 1290 DEG C, start rolling temperature during roughing is 1150 ~ 1230 DEG C outside the edge of a wing, be 1100 ~ 1200 DEG C in web central authorities, finishing temperature during finish rolling is 750 ~ 820 DEG C outside the edge of a wing, be 650 ~ 750 DEG C in web central authorities, stocking is at cold bed naturally cooling.
9. preparation method as claimed in claim 3, is characterized in that the feed quantity of the Ti line in LF stove refinement step is 0.25 ~ 0.65kg/t steel.
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CN103938079B (en) * 2014-05-16 2016-05-11 莱芜钢铁集团有限公司 Hot rolled H-shaped and the production method of the super thick specification low-temperature type of low compression ratio
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