CN102517513A - 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 PDFInfo
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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
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 and use steel, the hydraulic prop that relates more specifically to a kind of HS, corrosion-resistant, high anti-seismic performance is with steel and production technique thereof.
Background technology
Along with China's economy develops sustainedly and stably; Machinery and lifting industry have obtained the progress of matter, and industries such as coal mining have also obtained obvious improvement, use steel as the gentle moveable cylinder of hydraulic pressure with hydraulic prop; Improve constantly along with what require, also increasingly high to material and performance requriements.The hydraulic prop pipe is the hydraulic prop and the used important materials of mining bracket major parts (cylinder body or plunger) of fully-mechanized minings such as coal, machinery.The use of hydraulic prop pipe requires to have good security and safety, weldableness, machinability etc.
Security and safety: the WP of hydraulic prop is high, in case must not be cleaved into fragment when being destroyed when cylinder body or plunger pressurized, in case hurt sb.'s feelings.For the safety that guarantees to use with reliable, the hydraulic prop pipe must have HS and toughness is good.
Good weldableness: hydraulic prop, hydraulic support pillar cylinder body, plunger and miscellaneous part surge welding process are connected, and the steel pipe that therefore requires to use must have good weldableness.
Good machinability: when 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.
Because not only environment is abominable for industries such as coal mining: have characteristics such as high dust, high temperature, high humidity; The possibility that runs into than big bang is also all arranged at any time; Support also increasingly high as hydraulic pressure with the requirement of steel; Not only to have good hardness and wear resisting property, also will have higher erosion resistance and higher intensity and good seismic resistance.
CN 101280391A discloses a kind of high-strength tough hydraulic prop seamless steel pipe, solved existing hydraulic prop steel pipe can't have concurrently cost low with intensity, flexible shortcoming, had good economy and safe over-all properties.Said 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 it is relatively poor to be somebody's turn to do said weldless steel tube wear resistance of invention and corrosion resistance nature, the application of the weldless steel tube under the corrosion-resistant condition of can't satisfying the demand.
At present, domestic common employing 27SiMn uses steel as hydraulic prop, and its wear resisting property is good, and intensity is high, but its intensity is low, corrosion resistance is relatively poor, strong flexor ratio is less and poor seismic behavior.The hydraulic prop of present domestic use uses the composition of steel 27SiMn steel to be 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 The development in society and economy, in order to adapt to the demand in market, it is extremely urgent with the hydraulic prop steel pipe of good hardness, intensity, wear resisting property, corrosion resistance nature and anti-seismic performance to develop a kind of while.
Summary of the invention
To the deficiency of prior art, one of the object of the invention is to provide a kind of hydraulic prop to use steel, and said steel has advantages such as HS, corrosion resistant performance is good, anti-seismic performance is good.
Said hydraulic prop is used steel, and 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 unavoidable impurities.
As preferred version, said hydraulic prop is used steel, and 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 unavoidable impurities.
As preferred version, said hydraulic prop is used steel, and 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 unavoidable impurities.
C is the most basic element in the composition of steel design, is traditional most economical strengthening element, and the intensity of steel almost is that the increase along with C% linearly increases; Can significantly improve the intensity of steel, can improve the hardening capacity and the hardenability of steel again simultaneously, but the plasticity of steel is worsened; If C too high levels; In modified heat tracing process,, consider the over-all properties of material because the effect of Si very easily causes the C greying in the steel; C content is 0.25%-0.34% in the said steel, 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 ferritic and the austenite with molten admittedly form, in its raising steel the effect of the intensity of sosoloid and cold deformation cementation index extremely strong, be only second to P; But also reduce the toughness and the plasticity of steel simultaneously to a certain extent.Si is medium to the hardening capacity influence of steel, but the temper resistance and the oxidation-resistance of steel had very big benefit.When Si content is higher, if the C too high levels owing to the effect of higher Si, very easily causes the C greying in the steel in modified heat tracing process.Contain the Si steel when heating, the surface will form one deck SiO
2Film, thereby the high-temperature oxidation resistance of raising steel add the antioxidant property that higher Si all can improve steel in Cr steel and Mn steel.But Si is the element that significantly improves the ys of steel, so the Si too high levels can reduce the strong flexor ratio of material, thereby reduces the anti-seismic performance of material.Si adds silicon as reductive agent and reductor in steelmaking process; The general requirement of compound material; Si content is 0.90-1.30% in the said steel, 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, in steel, can dissolve in ferritic; Strengthen matrix, can refine pearlite when rolling postcooling and can improve content of pearlite in alloy relatively, therefore; Can improve intensity and hardness, improve heat treatment performance, and less to the plasticity influence of material.Along with the increase of Mn content except that the Ms point of steel reduces, because the increase of hardening capacity, after steel quenches; So residual austenite wherein also sharply increases when thermal treatment, general requirement is in time carried out subzero treatment, to eliminate the residual austenite in the steel; Simultaneously, along with the increase of Mn content, its thermal conductivity sharply descends; Its linear expansivity but increases simultaneously; Thereby in material heating or process of cooling, very easily produce bigger internal stress, will cause the cracking of workpiece when serious, so the each side requirement of compound material; Mn content is confirmed 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 the antioxygenation that steel grade can significantly improve steel, increase the resistance to corrosion of steel.Cr and iron form continuous solid solution, form multiple carbide with C, and the carbide of the complicacy of Cr (Cr, Fe)
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 the steel, makes steel have anticorrosive tendency and oxidation resistant ability.When it receives 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 advantageous conditions, and is not dissolved, and works as it and be destroyed, and can also recover voluntarily.The passivation of a certain metal or steel is not the fixed state, and just as far as certain medium or condition, if ambient condition has changed, passivation will be destroyed.In modified structure iron, the main effect of Cr is the through hardening performance that improves steel, makes steel have good comprehensive mechanical properties through after modified, can also make the steel surface form a kind of special protective membrane, improves the wear-resisting and corrosion resistance nature of steel.Take all factors into consideration; Cr content is confirmed 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 commonly used in the steel.Add a spot of aluminium in the steel, but crystal grain thinning improves 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 according to the 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 influence 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 the ausforming recrystallize; Precipitation strength; Change the microstructure of steel.Ni is as the national strategy goods and materials; Have a full house at material property and to lack the principle of usefulness when requiring as far as possible; Ni is a kind of residual element among the present invention, so be decided to be: Ni≤0.30%, for example 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 gathers partially at intergranular and causes embrittlement of grain boundaries, can cause material at high temperature temper brittleness; When simultaneously P surpasses certain content; Brittle transition temperature to steel improves a lot, causes material at low temperature impelling strength low, worsens the comprehensive mechanical property of steel.P of the present invention≤0.025%, 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 ferritic and austenite is all very little, so in the casting blank solidification process, along with solidifying of molten steel; S will be to the liquid portion enrichment of ot-yet-hardened; As a result, more sulfide inclusion will be contained in (strand heart portion, and between dendritic tissue) at the final set position of strand, make the macrostructure of steel inhomogeneous.Higher S content will damage the corrosion stability of steel, make steel surface produce pitting corrosion, so the present invention is set at S content: S≤0.025%, for example 0.024%, 0.014%, 0.005%, 0.006%, 0.007%, 0.010%.
Cu:Cu can improve intensity and toughness; Corrosion resistance nature particularly; But when hot-work, be easy to generate hot-shortly, the plasticity that Cu content surpasses 0.5% o'clock steel significantly reduces, among the present invention; The content of said 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 unavoidable impurities, and wherein, said impurity is the impurity that inevitably can introduce in the smelting process.Said impurity for example has Sb, Sn, As etc.
Strong flexor ratio is an important indicator weighing anti-seismic performance, and it is that tensile strength measured value/ys measured value by steel obtains.Its result can not be less than 1.25.Under earthquake action, skeleton construction has ductility and globality preferably, and viscous deformation appears in structure partial, and does not allow to occur brittle rupture.The purpose of strong flexor ratio is that the requirement steel has supporting capacity after certain surrender, guarantees that entire structure has the ability of stronger absorption seismic energy.It is 1.25～1.45 that hydraulic prop according to the invention uses the strong flexor ratio of steel, preferred 1.25～1.42, further preferred 1.30～1.42.
Hydraulic prop according to the invention reaches 3.5% with the alloy ratio of steel, and wherein, said alloy ratio is the shared mass percent sum of steel interalloy element.
Two of the object of the invention is to provide the production technique of a kind of aforesaid hydraulic prop with steel, and technology utilization converter smelting according to the invention can obtain that alloying constituent is higher, the lower hydraulic prop of content of P, S is used steel.The hydraulic prop that obtains through prepared according to the 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:
Said hydraulic prop is with the production technique of steel, and it may further comprise the steps:
(1) converter smelting: add molten iron and steel scrap; The employing double-slag operation and the stove that repeatedly falls take off P; And use the slide plate pushing off the slag and stay the steel tapping steel, take off S in advance after the deslagging for the second time, taking off that S leads is 30～40%; Adopt low catch carbon technology latter stage taking off S, P, and require to carry out the composition initial adjustment according to prescription;
(2) LF refining: in the LF refining furnace, take off O, take off S, and require to carry out trimming according to prescription;
(3) the VD degassing: adopt double VD to outgas;
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350～φ 600, rolling, modified, finally obtain hydraulic prop and use steel.
Converter steelmaking process mainly is carbon drop, dephosphorization, controlled temperature and preliminary alloying etc., and its technological operation then is control charging, oxygen supply, slag making and adding alloy material etc., obtaining desired molten steel, and pours into qualified steel ingot or strand.
Steel quality directly determines to influence the performance of steel.The following quantity of slag that reduces in the converter tapping process is to improve an important step of steel quality.Following slag has serious harm, and for example it can increase time sulphur, the rephosphorization amount of molten steel, influences the quality of steel billet; Increase the consumption of iron alloy; Influence the life-span of materials such as ladle, increase the treatment time of refining procedure, increase the consumption of synthetic slag in the follow-up refining procedure etc.The present invention adopts the slide plate pushing off the slag, and it is a kind of very effective pushing off the slag method.
The oxygen supply time of top-blown oxygen converter only tens minutes; Must form during this period have certain basicity, the slag of good fluidity, suitable red stone and content of magnesia, normal foamed; Produce qualified high-quality molten steel with assurance, and reduce erosion furnace lining.
Double-slag operation is to pour out 1/2～2/3 slag midway in smelting, adds slag charge slag making again then, 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 the steel tapping steel mainly is converter when tapping, guarantees the slag of tap, avoid because time P that descends slag to cause, thereby guarantee the stable content of P, and molten steel can not return P in subsequent handling.
Adopt low catch carbon technology latter stage taking off S, P, the temperature of guaranteeing molten iron satisfies the requirement that refining is smelted after adding a large amount of alloys, carry out the composition initial adjustment at last, makes each component satisfy the prescription requirement.
The 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, removes inclusion, and carries out the accurate control of composition, is production hypoxemia, low-sulfur, the necessary refining process of narrow component steel.
The present invention utilizes the LF refining furnace, in the LF refining furnace, takes off S, takes off O and trimming, makes each component satisfy the prescription requirement, smelts to obtain qualified molten steel, supplies follow-up continuous caster to carry out continuous casting.
The present invention adopts the VD of double to outgas, and reduces the gas content in the molten steel.
Modified, promptly quench and the comprehensive thermal treatment process of high tempering.Modified mostly work under bigger dynamic load effect, the effect that they are bearing stretching, compression, bending, are reversing or shear, the surface that has also has friction, requires to have certain wear resistance or the like.In a word, part is in work under the various compound stresses.This type part is mainly the structural part of various machines and mechanism, like axle class, connecting rod, bolt, gear etc., in process industries such as lathe, automobile and tractor, uses very generally.Especially the large component in making for heavy-duty machine, modifier treatment is used manyly. and therefore, modifier treatment occupies very important position in thermal treatment.In engineering goods modified, because of its stress condition different, also just not exclusively the same to its desired performance.Generally speaking, various modified all should have good comprehensive mechanical property, i.e. the proper fit of HS and H.T. is to guarantee the long-term work of part.
Hydraulic prop after modified according to the invention uses the mechanical property of steel to be: tensile strength R
mBe 1100～1200MPa, ys 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, is widely used in to make coal mine hydraulic supporting and cylinder, post, and other hydro-cylinder, post.
Compared with prior art, the present invention has following advantage:
(1) adopts the Cr alloying, improved the corrosion resistance nature of intensity, anti-seismic performance (strong flexor ratio) and the material of material greatly.Hydraulic prop after modified according to the invention uses the mechanical property of steel to be: tensile strength R
mBe 1100～1200MPa, ys 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 uses steel through its mechanical property of modified back being: tensile strength Rm is 980～1080MPa, ys 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 of the present invention is used steel, has the characteristics of HS, corrosion-resistant, high anti-seismic performance.
(2) hydraulic prop provided by the present invention greatly reduces P, S content in the steel with the 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 following that the present invention enumerates embodiment.Those skilled in the art should understand, and said embodiment helps to understand the present invention, should not be regarded as concrete restriction of the present invention.
Hydraulic prop according to the invention adopts following production technique to prepare with steel:
(1) converter smelting: in the converter of 70 tons of converter top and bottom complex blowing formulas, smelt, add molten iron and steel scrap, the double-slag operation and the stove that repeatedly falls take off P; And use the slide plate pushing off the slag and stay the steel tapping steel, take off S in advance after the deslagging for the second time, taking off that S leads is 30～40%; Realize taking off in advance P and take off S in advance, adopts low catch carbon technology, the temperature of raising molten steel latter stage taking off S, P; So that be to add bigger alloy amount, and carry out the composition initial adjustment, make each component satisfy the prescription requirement as preparation;
(2) LF refining is taken off S, is taken off O and trimming in the LF refining furnace in 70 tons of LF stoves, make each component satisfy the prescription requirement;
(3) the VD degassing: adopt the VD of double to outgas, guarantee that the gas content in the steel is lower.
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350～φ 600, rolling, modified, finally obtain HS, hydraulic prop corrosion-resistant, high anti-seismic performance is used steel.
Embodiment one
Prepare hydraulic prop through production technique as stated and use steel, said hydraulic prop consists of with steel by mass percentage:
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 following with the mechanical property of steel:
Tensile strength R
m=1160MPa, ys R
El=860MPa, elongation A
5=13%, relative reduction in area=45%, impact absorbing energy A
KU2=50J.
Embodiment 2
Prepare hydraulic prop through production technique as stated and use steel, said hydraulic prop consists of with steel by mass percentage:
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 following with the mechanical property of steel:
Tensile strength R
m=1180MPa, ys R
El=855MPa, elongation A
5=14%, relative reduction in area=47%, impact absorbing energy Aku2=57J.
Embodiment 3
Prepare hydraulic prop through production technique as stated and use steel, said hydraulic prop consists of with steel by mass percentage:
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 following with steel mechanical property:
Tensile strength R
m=1140MPa, ys R
E1=865MPa, elongation A
5=12%, relative reduction in area=43%, impact absorbing energy Aku2=48J.
Embodiment 4
Prepare hydraulic prop through production technique as stated and use steel, said hydraulic prop consists of with steel by mass percentage:
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 following with the mechanical property of steel:
Tensile strength R
m=1100MPa, ys R
El=845MPa, elongation A
5=13%, relative reduction in area=41%, impact absorbing energy Aku=240J.
Embodiment 5
Prepare hydraulic prop through production technique as stated and use steel, said hydraulic prop consists of with steel by mass percentage:
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 following with the mechanical property of steel:
Tensile strength R
m=1200MPa, ys R
El=885MPa, elongation A
5=16%, relative reduction in area=50%, impact absorbing energy Aku2=60J.
Hydraulic prop according to the invention can be good with rigidity, have HS, corrosion-resistant and anti-seismic performance excellent characteristics, 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 explains detailed prescription of the present invention and production technique through the foregoing description, the present invention is not limited to above-mentioned detailed prescription and technical process, does not mean that promptly the present invention must rely on above-mentioned detailed prescription and technical process could be implemented.The person of ordinary skill in the field should understand, and to any improvement of the present invention, to the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (7)
1. a hydraulic prop is used steel, it is characterized in that, 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 unavoidable impurities.
2. hydraulic prop as claimed in claim 1 is used steel; It is characterized in that; 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 unavoidable impurities.
3. according to claim 1 or claim 2 hydraulic prop is used steel; It is characterized in that; 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 unavoidable impurities.
4. use steel like the described hydraulic prop of one of claim 1-3, it is characterized in that, it is 1.25～1.45 that said hydraulic prop uses the strong flexor ratio of steel, preferred 1.25～1.42, further preferred 1.30～1.42.
5. use steel like the described hydraulic prop of one of claim 1-4, it is characterized in that, the alloy ratio of said steel reaches 3.5%, and wherein, said alloy ratio is the shared mass percent sum of steel interalloy element.
6. the described hydraulic prop of one of claim 1-5 is characterized in that with the production technique of steel it may further comprise the steps:
(1) converter smelting: add molten iron and steel scrap, the employing double-slag operation and the stove that repeatedly falls take off P, and use the slide plate pushing off the slag and stay the steel tapping steel; Take off S in advance after the deslagging for the second time; Taking off that S leads is 30～40%, take off S, P adopts low catch carbon technology latter stage, carries out the composition initial adjustment according to prescription;
(2) LF refining: in the LF refining furnace, take off O, take off S, and carry out trimming according to prescription;
(3) the VD degassing: adopt double VD to outgas;
(4) continuous casting: utilize the continuous cast round billets of continuous caster cast φ 350～φ 600, rolling, modified, finally obtain hydraulic prop and use steel.
7. production technique as claimed in claim 6 is characterized in that, said hydraulic prop after modified uses the mechanical property of steel to be: tensile strength R
mBe 1100～1200MPa, ys R
E1Be 845～885MPa, elongation A
5Be 12～16%, relative reduction in area is 41～50%, and impact absorbing energy Aku2 is 40～60J.
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| CN201210008423.9A CN102517513B (en) | 2012-01-12 | 2012-01-12 | Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof |
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| CN201210008423.9A CN102517513B (en) | 2012-01-12 | 2012-01-12 | Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof |
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Cited By (9)
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| CN103674824A (en) * | 2013-12-04 | 2014-03-26 | 南京钢铁股份有限公司 | Medium simulation fluid and pitting corrosion resistant performance based method for selection of hydraulic support steel |
| 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 |
| CN110541108A (en) * | 2019-07-26 | 2019-12-06 | 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 |
| CN114182179A (en) * | 2021-12-13 | 2022-03-15 | 芜湖新兴铸管有限责任公司 | High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674824A (en) * | 2013-12-04 | 2014-03-26 | 南京钢铁股份有限公司 | Medium simulation fluid and pitting corrosion resistant performance based method for selection of hydraulic support steel |
| 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 |
| CN110541108A (en) * | 2019-07-26 | 2019-12-06 | 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 |
| 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 |
| CN111910128B (en) * | 2020-08-07 | 2022-02-22 | 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 |
| CN114182179A (en) * | 2021-12-13 | 2022-03-15 | 芜湖新兴铸管有限责任公司 | High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof |
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