CN102517513B - Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof - Google Patents

Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof Download PDF

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CN102517513B
CN102517513B CN201210008423.9A CN201210008423A CN102517513B CN 102517513 B CN102517513 B CN 102517513B CN 201210008423 A CN201210008423 A CN 201210008423A CN 102517513 B CN102517513 B CN 102517513B
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steel
hydraulic prop
hydraulic
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strength
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CN102517513A (en
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尹修刚
王社教
李学刚
陈宏豫
姚忠
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Chengde Jianlong Special Steel Co Ltd
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Chengde Jianlong Special Steel Co Ltd
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Abstract

The invention relates to steel for a hydraulic supporting column and a production process thereof. The steel consists of the following components in percentage by mass: 0.25-0.34 percent of C, 0.90-1.30 percent of Si, 0.80-1.20 percent of Mn, 0.80-1.30 percent of Cr, 0.02-0.10 percent of Al, less than or equal to 0.30 percent of Ni, less than or equal to 0.025 percent of S, less than or equal to 0.025 percent of P, less than or equal to 0.20 percent of Cu and the balance of Fe and unavoidable impurities. In the invention, Cr alloying is adopted, so that the strength, anti-seismic performance and corrosion resistance of the hydraulic supporting column are greatly improved, and the steel can be taken as a seamless steel pipe for the hydraulic supporting column, and can be widely used for manufacturing coal mine hydraulic brackets, cylinders, columns and other hydraulic cylinders and columns.

Description

Steel and production technique thereof for the hydraulic prop of a kind of high strength, corrosion-resistant, high anti-seismic performance
Technical field
The present invention relates to the steel alloy in a kind of steel industry, be specifically related to a kind of hydraulic prop steel, relate more specifically to hydraulic prop steel and the production technique thereof of a kind of high strength, corrosion-resistant, high anti-seismic performance.
Background technology
Along with China's economy develops sustainedly and stably, machinery and lifting industry have obtained the progress of matter, and the industries such as coal mining have also obtained significant progress, are used as hydraulic pressure and hydraulic prop steel for pneumatic cylinder, along with improving constantly of requiring, also more and more higher to material and performance requriements.Hydraulic supporting column jecket is hydraulic prop and mining bracket major parts (cylinder body or the plunger) important materials used of the fully-mechanized mining such as coal, machinery.The use of hydraulic supporting column jecket, requires to have good security and reliability, weldability, machinability etc.
Security and reliability: the operating pressure of hydraulic prop is high, when cylinder body or plunger suffer destroy to be cleaved into fragment once pressurized, in case hurt sb.'s feelings.For the safety that guarantees to use and reliable, hydraulic supporting column jecket must have high strength and toughness is good.
Good weldability: hydraulic prop, hydraulic support pillar cylinder body, plunger and miscellaneous part surge welding process are connected, therefore requires the steel pipe using must have good weldability.
Good machinability: while making hydraulic prop, the inside and outside surface of steel pipe all needs precision work, therefore requires steel pipe must have good cutting and abrasive property.
Due to industries such as coal minings, not only environment is severe: have the features such as high dust, high temperature, high humidity, also there is at any time the possibility running into compared with big bang, also more and more higher with the requirement of steel as hydraulic pressure support, not only to there is good hardness and wear resisting property, also will there is higher erosion resistance and higher intensity and good anti-seismic performance.
CN 101280391A discloses a kind of high-strength tough hydraulic prop seamless steel pipe, has solved existing hydraulic prop steel pipe and cannot have concurrently the shortcoming of the low and intensity of cost, toughness, has had good economy and safety comprehensive performance.Described steel contains by weight percentage, C: 0.15~0.35%, Si: 0.10~0.60%, Mn: 1.00~2.00, Nb: 0.02~0.07%, Al: 0.01~0.06%, Ti: 0.02~0.12%, P: below 0025%, S: below 0.025%, O: below 0.0035%.But the described weldless steel tube wear resistance of this invention and corrosion resistance nature are poor, the application of the weldless steel tube under corrosion-resistant condition of cannot satisfying the demand.
At present, domestic common employing 27SiMn is as hydraulic prop steel, and its wear resisting property is good, and intensity is high, but its intensity is low, corrosion resistance is poor, strong flexor ratio is less and poor seismic behavior.The hydraulic prop of current domestic use with the composition of steel 27SiMn steel is by mass percentage: C: 0.24~0.32%, Si: 1.10~1.40%, Mn: 1.10~1.40, Ni≤0.30, Cu≤0.20, P≤0.035, S≤0.035, Cr≤0.30.
In order to adapt to socioeconomic development, in order to adapt to the demand in market, develop a kind of while extremely urgent with the hydraulic prop steel pipe of good hardness, intensity, wear resisting property, corrosion resistance nature and anti-seismic performance.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to provide a kind of hydraulic prop steel, and described steel has the advantages such as high strength, corrosion resistant performance is good, anti-seismic performance is good.
Described hydraulic prop steel, its composition is by mass percentage:
C: 0.25~0.34%, Si: 0.90~1.30%, Mn: 0.80~1.20%, Cr: 0.80~1.30%, Al: 0.02~0.10%, Ni≤0.30%, S≤0.025%, P≤0.025%, Cu≤0.20%, surplus is Fe and inevitable impurity.
As preferred version, described hydraulic prop steel, its composition is by mass percentage:
C: 0.28-0.33%, Si: 1.00-1.20%, Mn: 0.90-1.10%, Cr: 0.90-1.10%, Al: 0.02~0.05%, Ni≤0.10%, S≤0.005%, P≤0.015%, Cu≤0.20%, surplus is Fe and inevitable impurity.
As preferred version, described hydraulic prop steel, its composition is by mass percentage:
C: 0.30-0.33%, Si: 1.10-1.20%, Mn: 1.00-1.10%, Cr: 1.00-1.10%, Al: 0.02~0.03%, Ni≤0.10%, S≤0.005%, P≤0.015%, Cu≤0.20%, surplus is Fe and inevitable impurity.
C is the most basic element in composition of steel design, it is traditional most economical strengthening element, the intensity of steel is almost along with the increase of C% linearly increases, can significantly improve the intensity of steel, can improve again hardening capacity and the hardenability of steel simultaneously, but also make the plasticity of steel worsen, if C too high levels, in modified heating and thermal insulation process due to the effect of Si, very easily cause the C greying in steel, consider the over-all properties of material, in described steel, C content is 0.25%-0.34%, for example 0.26%, 0.27%, 0.28%, 0.29%, 0.30%, 0.31%, 0.32%, 0.33%, 0.265%, 0.275%, 0.285%, 0.295%.
Si: be present in ferrite and austenite with admittedly molten form, it is extremely strong that its improves in steel the intensity of sosoloid and the effect of cold deformation cementation index, is only second to P; But also reduce to a certain extent toughness and the plasticity of steel simultaneously.Si is medium on the hardening capacity impact of steel, but temper resistance and oxidation-resistance to steel has very large benefit.When Si content is higher, if C too high levels due to the effect of higher Si, very easily causes the C greying in steel in modified heating and thermal insulation process.Containing Si steel, in the time heating, surface will form one deck SiO 2film, thus the high-temperature oxidation resistance of raising steel adds higher Si all can improve the antioxidant property of steel in Cr steel and Mn steel.But Si is the element that significantly improves the yield strength of steel, so Si too high levels can reduce the strong flexor ratio of material, thereby reduce the anti-seismic performance of material.Si adds silicon as reductive agent and reductor in steelmaking process, the general requirement of compound material, in described steel, Si content is 0.90-1.30%, for example 0.91%, 0.92%, 0.93%, 0.94%, 0.95%, 0.96%, 0.97%, 0.98%, 0.99%, 1.29%, 1.28%, 1.27%, 1.26%, 1.25%, 1.24%, 1.23%, 1.22%, 1.21%.
Mn: in steelmaking process, manganese is good reductor and sweetening agent, can dissolve in ferrite in steel, strengthening matrix, can refine pearlite when cooling after rolling and can relatively improve content of pearlite in alloy, therefore, can improve intensity and hardness, improve heat treatment performance, and less on the plasticity impact of material.Along with the increase of Mn content is except the Ms point of steel reduces, due to the increase of hardening capacity, after steel quenches, so residual austenite wherein also sharply increases in the time of thermal treatment, general requirement is carried out subzero treatment in time, to eliminate the residual austenite in steel, simultaneously, along with the increase of Mn content, its thermal conductivity sharply declines, its linear expansivity but increases simultaneously, thereby in the heating of material or process of cooling, very easily produce larger internal stress, when serious, the cracking of workpiece will be caused, so each side requirement of compound material, Mn content is defined as: 0.80-1.20%, for example 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.88%, 0.89%, 1.19%, 1.18%, 1.17%, 1.16%, 1.15%, 1.14%, 1.13%, 1.12%, 1.11%.
Cr: add steel grade can significantly improve the antioxygenation of steel, increase the resistance to corrosion of steel.Cr and iron form continuous solid solution, form multiple carbide, the complicated carbide (Cr, Fe) of Cr with C 7c 3, and (Cr, Fe) 23c 6performance for steel has remarkably influenced, particularly the wear resistance of steel.Cr can significantly increase the hardening capacity of steel, but also increases the temper brittleness tendency of steel.Cr is the element with passivation tendency.Therefore the Cr of certain ingredients adds in steel, makes steel have anticorrosive tendency and oxidation resistant ability.In the time that it is subject to certain erosion medium resistance, form layer oxide film on the surface of steel part, this tunic is passive film, and passive film is fine and close under favourable condition, not dissolved, and destroyed when it, can also recover voluntarily.The passivation of a certain metal or steel is not fixing state, and just for certain medium or condition, if ambient condition has changed, passivation will be destroyed.In modified structure iron, the Main Function of Cr is the through hardening performance that improves steel, makes steel after modified, have good comprehensive mechanical property, can also make steel surface form a kind of special protective membrane, improves the wear-resisting and corrosion resistance nature of steel.Consider, Cr content is defined as: 0.80-1.30%, for example 0.81%, 0.82%, 0.83%, 0.84%, 0.85%, 0.86%, 0.87%, 0.88%, 0.89%, 1.29%, 1.28%, 1.27%, 1.26%, 1.25%, 1.24%, 1.23%, 1.22%, 1.21%.
Al: aluminium is reductor conventional in steel.In steel, add a small amount of aluminium, can crystal grain thinning, improve impelling strength.Aluminium also has oxidation-resistance and corrosion resistance, and aluminium and chromium, silicon share, and can significantly improve the high temperature non-scale performance of steel and the ability of high-temperature corrosion resistance.The content of aluminium of the present invention is 0.02~0.10%, for example 0.03%, 0.04%, 0.05%, 0.06%, 0.07%, 0.08%, 0.09%.
Ni: microalloy element the most widely at present, the microstructure parameter that they can affect in steel is the shape of grain-size; The precipitate of various size; Dislocation desity; The size and dimension of non-metallic inclusion etc.Effect in steel: stop grain growth; Stop ausforming recrystallize; Precipitation strength; Change the microstructure of steel.Ni is as national strategy goods and materials, in the material property principle of use less of having a full house when requiring as far as possible, in the present invention, Ni is a kind of residual element, for example, so be decided to be: Ni≤0.30%, 0.29%, 0.28%, 0.27%, 0.25%, 0.15%, 0.02%, 0.04%.
P:P is a kind of harmful residual element, and P causes embrittlement of grain boundaries in intergranular segregation, can cause material at high temperature temper brittleness, when P exceedes certain content simultaneously, the brittle transition temperature of steel is improved a lot, cause material at low temperature impelling strength low, worsen the comprehensive mechanical property of steel.P≤0.025% of the present invention, for example 0.024%, 0.014%, 0.005%, 0.006%, 0.007%, 0.010%.
S:S is a kind of harmful residual element, solubleness in ferrite and austenite is all very little, so in casting blank solidification process, along with solidifying of molten steel, S is by the liquid portion enrichment to ot-yet-hardened, as a result, will contain more sulfide inclusion at the final set position of strand (between strand heart portion and dendritic tissue), make the macrostructure of steel inhomogeneous.Higher S content will infringement steel corrosion stability, make steel surface produce pitting corrosion, for example, so the present invention is set as S content: S≤0.025%, 0.024%, 0.014%, 0.005%, 0.006%, 0.007%, 0.010%.
Cu:Cu can improve intensity and toughness, particularly corrosion resistance nature, but in the time of hot-work, easily produce hot-short, when Cu content exceedes 0.5%, the plasticity of steel significantly reduces, in the present invention, the content of described Cu is≤0.20%, for example 0.19%, 0.185,0.14%, 0.10%, 0.05%, 0.08%, 0.02%, 0.002%.
Surplus is Fe and inevitable impurity, and wherein, described impurity is the impurity that inevitably can introduce in smelting process.Described impurity for example has Sb, Sn, As etc.
Strong flexor ratio, is an important indicator weighing anti-seismic performance, and it is to be obtained by tensile strength measured value/yield strength measured value of steel.Its result can not be less than 1.25.Under earthquake action, skeleton construction has good ductility and globality, and viscous deformation appears in structure partial, and does not allow to occur brittle rupture.The object of strong flexor ratio is that requirement steel has supporting capacity after certain surrender, guarantees that total has the ability of stronger absorption seismic energy.Hydraulic prop of the present invention is 1.25~1.45 by the strong flexor ratio of steel, preferably 1.25~1.42, further preferably 1.30~1.42.
Hydraulic prop of the present invention reaches 3.5% with the alloy ratio of steel, and wherein, described alloy ratio is the shared mass percent sum of steel interalloy element.
Two of object of the present invention is to provide a kind of production technique of hydraulic prop as above steel, and technology utilization converter smelting of the present invention can obtain the hydraulic prop steel that alloying constituent is higher, the content of P, S is lower.The hydraulic prop preparing by technique of the present invention can reach 3.5%, P≤0.015%, S≤0.005% with the alloy ratio of steel.
In order to achieve the above object, the present invention has adopted following technical scheme:
The production technique of steel for described hydraulic prop, it comprises the following steps:
(1) converter smelting: add molten iron and steel scrap, employing double-slag operation the stove that repeatedly falls take off P, and use slide plate pushing off the slag and stay steel tapping steel, after deslagging, take off in advance for the second time S, it is 30~40% that de-S leads, adopt low catch carbon technique latter stage, and require to carry out composition initial adjustment according to formula at de-S, P;
(2) LF refining: de-O, de-S in LF refining furnace, and require to carry out trimming according to formula;
(3) VD is degassed: adopt double VD to carry out degassed;
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350~φ 600, rolling, modified, finally obtains hydraulic prop steel.
Converter steelmaking process, is mainly carbon drop, dephosphorization, control temperature and preliminary alloying etc., and its technological operation is control charging, oxygen supply, slag making and add alloy material etc., to obtain desired molten steel, and pours into qualified steel ingot or strand.
Steel quality directly determines to affect the performance of steel.The lower quantity of slag reducing in converter tapping process is to improve an important step of steel quality.Lower slag has serious harm, and for example it can increase time sulphur, the rephosphorization amount of molten steel, affects the quality of steel billet, increase the consumption of iron alloy, affect the life-span of the materials such as ladle, increase the treatment time of refining procedure, increase the consumption of synthetic slag in follow-up refining procedure etc.The present invention adopts slide plate pushing off the slag, and it is a kind of very effective slag stopping method.
The oxygen supply time of top-blown oxygen converter only tens minutes, must form during this period there is certain basicity, the slag of good fluidity, suitable ferric oxide and content of magnesia, normal foamed, to guarantee to produce qualified high-quality molten steel, and reduce the erosion to furnace lining.
Double-slag operation is to pour out 1/2~2/3 slag midway in smelting, then adds slag charge slag making again, and according to hot metal composition and institute's steelmaking kind requirement, also repeatedly new slag is made in deslagging.The present invention adopts double-slag operation and repeatedly falls the better dephosphorization effect of stove to reach.
Staying steel tapping steel is mainly converter in the time of tapping, guarantees the slag of tap, avoids time P that causes because of lower slag, thereby guarantees the stable content of P, and molten steel can not return P in subsequent handling.
Adopt low catch carbon technique latter stage at de-S, P, guarantee that the temperature of molten iron is adding after a large amount of alloys, meet the requirement that refining is smelted, finally carry out composition initial adjustment, make each component meet formula requirement.
LF refining is a kind of typical secondary refining means, and its important function is heating molten steel and the degree of depth, desulfurization rapidly, deoxidation, removal of inclusions, and carry out the accurate control of composition, be to produce hypoxemia, low-sulfur, the necessary refining process of narrow component steel.
The present invention utilizes LF refining furnace, and de-S, de-O and trimming in LF refining furnace, make each component meet formula requirement, smelts and obtain qualified molten steel, carries out continuous casting for follow-up continuous caster.
It is degassed that the present invention adopts the VD of double to carry out, and reduces the gas content in molten steel.
Modified, i.e. the Thermal Synthetic treatment process of quenching and high tempering.Mostly under larger dynamic load effect, work for modified, they are bearing the effect of stretching, compression, bending, torsion or shearing, and some surfaces also have friction, require to have certain wear resistance etc.In a word, part is under various compound stresses and works.This class part is mainly the structural part of various machines and mechanism, as axle class, connecting rod, bolt, gear etc., in the process industries such as lathe, automobile and tractor, uses very generally.Especially the large component in manufacturing for heavy-duty machine, modifier treatment is used manyly. and therefore, modifier treatment occupies very important position in thermal treatment.In engineering goods modified is because of its stress condition difference, also just not exclusively the same to its desired performance.In general, various modified all should have good comprehensive mechanical property, i.e. the suitable cooperation of high strength and high tenacity, to guarantee the long-term work smoothly of part.
Hydraulic prop after modified of the present invention by the mechanical property of steel is: tensile strength R mbe 1100~1200MPa, yield strength R elbe 845~885MPa, elongation A 5be 12~16%, relative reduction in area is 41~50%, and impact absorbing energy Aku2 is 40~60J.
Hydraulic prop of the present invention can be used as hydraulic prop seamless steel pipe with steel, and be widely used in and make coal mine hydraulic supporting and cylinder, post, and other hydro-cylinder, post.
Compared with prior art, tool of the present invention has the following advantages:
(1) adopt Cr alloying, greatly improved the corrosion resistance nature of intensity, anti-seismic performance (strong flexor ratio) and the material of material.Hydraulic prop after modified of the present invention by the mechanical property of steel is: tensile strength R mbe 1100~1200MPa, yield strength R elbe 845~885MPa, elongation A 5be 12~16%, relative reduction in area is 41~50%, impact absorbing energy A kU2be 40~60J.And existing 27SiMn hydraulic prop with steel in its mechanical property after modified is: tensile strength Rm is 980~1080MPa, yield strength R elbe 835~865MPa, elongation A 10be 12~17%, relative reduction in area is 40~48%, and impact absorbing energy Aku2 is 50~70J, and strong flexor ratio is 1.15~1.25.Hydraulic prop steel of the present invention, has the feature of high strength, corrosion-resistant, high anti-seismic performance.
(2) hydraulic prop provided by the present invention greatly reduces P, the S content in steel by steel production technique, wherein, and S≤0.005%, P≤0.015%, impurity is less, improve the cleanliness factor of material, reduced the segregation of material, and further improved the corrosion resistance of material.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment helps to understand the present invention, should not be considered as concrete restriction of the present invention.
Hydraulic prop of the present invention adopts following production technique to prepare with steel:
(1) converter smelting: smelt in the converter of 70 tons of converter top and bottom complex blowing formulas, add molten iron and steel scrap, double-slag operation the stove that repeatedly falls take off P, and use slide plate pushing off the slag and stay steel tapping steel, after deslagging, take off in advance for the second time S, it is 30~40% that de-S leads, and realizes pre-de-P and de-S in advance, adopts low catch carbon technique latter stage at de-S, P, improve the temperature of molten steel, so that for to add larger alloy amount as preparation, and carry out composition initial adjustment, make each component meet formula requirement;
(2) LF refining takes off S, de-O and trimming in 70 tons of LF stoves in LF refining furnace, makes each component meet formula requirement;
(3) VD is degassed: the VD of employing double carries out degassed, guarantees that the gas content in steel is lower.
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350~φ 600, rolling, modified, finally obtains the hydraulic prop steel of high strength, corrosion-resistant, high anti-seismic performance.
Embodiment mono-
Prepare hydraulic prop steel by production technique described above, described hydraulic prop consists of by mass percentage with steel:
C 0.29%, Si 1.00%, Mn 1.06%, Cr 1.01%, Ni 0.01%, Al 0.025%, S 0.003%, P 0.012%, Cu 0.02%, Sb 0.003%, Sn 0.0015%, As 0.006%, all the other are Fe.
Tandem rolling pierces and obtains hydraulic prop seamless steel pipe, and the specification of steel pipe is: φ 350mm × 11mm × 9m, and the hydraulic prop after modified is as follows by the mechanical property of steel:
Tensile strength R m=1160MPa, yield strength R el=860MPa, elongation A 5=13%, relative reduction in area=45%, impact absorbing energy A kU2=50J.
Embodiment 2
Prepare hydraulic prop steel by production technique described above, described hydraulic prop consists of by mass percentage with steel:
C 0.32%, Si 0.90%, Mn 1.10%, Cr 0.95%, Ni 0.02%, Al 0.029%, S 0.002%, P 0.011%, Cu 0.02%, Sb 0.003%, Sn 0.0015%, As 0.006%, all the other are Fe.
Tandem rolling pierces and obtains hydraulic prop seamless steel pipe, and the specification of steel pipe is: φ 320mm × 11mm × 9m, and the hydraulic prop after modified is as follows by the mechanical property of steel:
Tensile strength R m=1180MPa, yield strength R el=855MPa, elongation A 5=14%, relative reduction in area=47%, impact absorbing energy Aku2=57J.
Embodiment 3
Prepare hydraulic prop steel by production technique described above, described hydraulic prop consists of by mass percentage with steel:
C 0.31%, Si 1.07%, Mn 0.95%, Cr 1.08%, Ni 0.01%, Al 0.027%, S 0.003%, P 0.014%, Cu 0.02%, Sb 0.003%, Sn 0.0015%, As 0.006%, all the other are Fe.
Tandem rolling pierces and obtains hydraulic prop seamless steel pipe, and the specification of steel pipe is: φ 400mm × 12mm × 9m, and the hydraulic prop after modified is as follows with steel mechanical property:
Tensile strength R m=1140MPa, yield strength R e1=865MPa, elongation A 5=12%, relative reduction in area=43%, impact absorbing energy Aku2=48J.
Embodiment 4
Prepare hydraulic prop steel by production technique described above, described hydraulic prop consists of by mass percentage with steel:
C 0.25%, Si 1.30%, Mn 0.80%, Cr 1.30%, Ni 0.03%, Al 0.02%, S 0.005%, P 0.015%, Cu 0.04%, Sb 0.003%, Sn 0.0015%, As 0.006%, all the other are Fe.
Tandem rolling pierces and obtains hydraulic prop seamless steel pipe, and the specification of steel pipe is: φ 600mm × 12mm × 9m, and the hydraulic prop after modified is as follows by the mechanical property of steel:
Tensile strength R m=1100MPa, yield strength R el=845MPa, elongation A 5=13%, relative reduction in area=41%, impact absorbing energy Aku=240J.
Embodiment 5
Prepare hydraulic prop steel by production technique described above, described hydraulic prop consists of by mass percentage with steel:
C 0.34%, Si 0.90%, Mn 1.20%, Cr 0.80%, Ni 0.01%, Al 0.027%, S 0.003%, P 0.014%, Cu 0.02%, Sb 0.003%, Sn 0.0015%, As 0.006%, all the other are Fe.
Tandem rolling pierces and obtains hydraulic prop seamless steel pipe, and the specification of steel pipe is: φ 500mm × 12mm × 9m, and the hydraulic prop after modified is as follows by the mechanical property of steel:
Tensile strength R m=1200MPa, yield strength R el=885MPa, elongation A 5=16%, relative reduction in area=50%, impact absorbing energy Aku2=60J.
Hydraulic prop of the present invention is functional with steel, has high strength, the feature that corrosion-resistant and anti-seismic performance is excellent, and as hydraulic prop seamless steel pipe, can be widely used in and make coal mine hydraulic supporting and cylinder, post, and other hydro-cylinder, post.
Applicant's statement, the present invention illustrates detailed formula of the present invention and production technique by above-described embodiment, the present invention is not limited to above-mentioned detailed composition and engineering flow process, does not mean that the present invention must rely on above-mentioned detailed composition and engineering flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, and the selections of the equivalence replacement to the each raw material of product of the present invention and the interpolation of ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.

Claims (4)

1. a hydraulic prop steel, is characterized in that, its composition is by mass percentage:
C:0.25~0.31%, Si:0.90~1.07%, Mn:1.11~1.20%, Cr:0.80~1.08%, Al:0.02~0.10%, Ni≤0.30%, S≤0.005%, P≤0.015%, Cu≤0.20%, surplus is Fe and inevitable impurity; Described hydraulic prop is 1.25~1.45 by the strong flexor ratio of steel; The alloy ratio of described steel reaches 3.5%, and wherein, described alloy ratio is the shared mass percent sum of steel interalloy element;
The production technique of steel for described hydraulic prop, it comprises the steps:
(1) converter smelting: add molten iron and steel scrap, employing double-slag operation the stove that repeatedly falls take off P, and use slide plate pushing off the slag and stay steel tapping steel, after deslagging, take off in advance for the second time S, it is 30~40% that de-S leads, and adopts low catch carbon technique latter stage at de-S, P, carries out composition initial adjustment according to formula;
(2) LF refining: de-O, de-S in LF refining furnace, and carry out trimming according to formula;
(3) VD is degassed: adopt double VD to carry out degassed;
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350~φ 600, rolling, modified, finally obtains hydraulic prop steel.
2. hydraulic prop steel as claimed in claim 1, is characterized in that, described hydraulic prop is 1.25~1.42 by the strong flexor ratio of steel.
3. hydraulic prop steel as claimed in claim 2, is characterized in that, described hydraulic prop is 1.30~1.42 by the strong flexor ratio of steel.
4. hydraulic prop steel as claimed in claim 1, is characterized in that, described hydraulic prop after modified by the mechanical property of steel is: tensile strength R mbe 1100~1200MPa, yield strength R elbe 845~885MPa, elongation A 5be 12~16%, relative reduction in area is 41~50%, and impact absorbing energy Aku2 is 40~60J.
CN201210008423.9A 2012-01-12 2012-01-12 Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof Active CN102517513B (en)

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CN103674824B (en) * 2013-12-04 2016-01-20 南京钢铁股份有限公司 Medium simulated solution and select the method for hydraulic support steel based on pitting resistance
CN107502833A (en) * 2017-07-06 2017-12-22 山东钢铁股份有限公司 A kind of mining machinery swivel pin steel and preparation method thereof
CN110541108B (en) * 2019-07-26 2021-08-03 马鞍山钢铁股份有限公司 Nb and V composite 700MPa grade high-strength anti-seismic steel bar steel and production method thereof
CN111304529A (en) * 2019-12-02 2020-06-19 张子夜 Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof
CN111519110A (en) * 2020-05-13 2020-08-11 江苏联峰实业有限公司 Low alloy corrosion resistant steel
CN111910128A (en) * 2020-08-07 2020-11-10 安阳钢铁股份有限公司 Steel plate for Q690-grade coal mine hydraulic support and production method thereof
CN112647027A (en) * 2020-11-16 2021-04-13 何满潮 Novel NPR (nitrogen phosphorus) anchor rod or anchor cable material converter and production method of continuous casting billet
CN112962027A (en) * 2021-02-01 2021-06-15 建龙北满特殊钢有限责任公司 Optimized machining method of alloy structural steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101182622A (en) * 2007-12-18 2008-05-21 江苏沙钢集团淮钢特钢有限公司 High intensity, corrosion resistant and high ductility steel for mooring chain and production process thereof
CN102251186A (en) * 2011-06-21 2011-11-23 莱芜钢铁集团有限公司 Steel for high-strength mining machine and manufacturing method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101343714B (en) * 2008-08-21 2011-08-17 攀钢集团成都钢铁有限责任公司 30CrMnSiB steel, weldless steel tube for cylinder and method of manufacturing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101182622A (en) * 2007-12-18 2008-05-21 江苏沙钢集团淮钢特钢有限公司 High intensity, corrosion resistant and high ductility steel for mooring chain and production process thereof
CN102251186A (en) * 2011-06-21 2011-11-23 莱芜钢铁集团有限公司 Steel for high-strength mining machine and manufacturing method thereof

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