CN103276315A - 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof - Google Patents
900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate. The 900MPa-level ultrahigh-tenacity high-toughness pipeline steel plate comprises the following chemical compositions in percentage by weight: 0.035%-0.065% of C, 0.15-%-0.40% of Si, 1.90%-2.50% of Mn, less than or equal to 0.012% of P, less than or equal to 0.0015% of S, 0.030%-0.055% of Nb, 0.010%-0.25% of Ti, 0-0.30% of Cu, 0.35%-0.60% of Cr, 0.10%-0.50% of Ni, 0-0.50% of Mo, 0.020%-0.050% of Al, 0.0010%-0.0030% of B, less than or equal to 0.0080% of N. The preparation method comprises the steps of: smelting and continuously casting into blanks; heating casting blanks; roughly rolling; finely rolling; fast cooling; straightening after stopping for 40-60S. By adding B and Cr elements and reducing the content of Nb, Mo and Ni, the production cost of the ultrahigh-tenacity X80 pipeline steel can be obviously lowered, and the efficiency can be improved; a metallographic structure is bainite plus less M-A structure, the main mechanical properties are as follows: more than or equal to 900MPa of RP0.2, more than or equal to 1050MPa of Rm, less than or equal to 0.90 of RP0.2/Rm, more than equal to 12% of elongation (A50mm), more than or equal to 200J of minus 20degree CKV2, and more than or equal to 5% of minus 15 degree CDWTTSA.
Description
Technical field
The present invention relates to microalloyed steel and make the field, specifically for to satisfy domestic and international high pressure long distance pipeline trunk main to the demand of superstrength, high tenacity pipeline steel plate, provide a kind of 900MPa grade high ductility pipeline steel plate and manufacture method thereof.
Background technology
Along with the high speed development of world economy, the demand of oil, Sweet natural gas equal energy source resource is grown with each passing day, the construction of oil, Long-distance Transmission Pipeline obtains flourish.Be the transport efficiency of raising long distance pipeline and the economy of operation, in recent years, transfer pressure and the caliber of pipeline constantly increase, for ensureing the security of high pressure long distance pipeline operation, the intensity of employed pipe line steel material and the requirement of fracture toughness property are also improved constantly, and the large-scale engineering applications of ultrahigh-intensity high-toughness pipe line steel in following long distance pipeline become inevitable.For this reason, the invention provides a kind of 900MPa grade super strength high tenacity pipeline steel plate and manufacture method thereof.
Before patent of the present invention, number of patent application is 200410025584.41 patent of invention " high-intensity high-tenacity X80 pipe line steel and hot rolled plate making process thereof ", number of patent application is 200810227820.9 patent of invention " a kind of high-strength high-toughness X 80 hot rolling coiled sheet for spiral buried arc welding and production method thereof ", number of patent application is that 200910237313.8 patent of invention " a kind of X 70 hot-rolled steel coil for pipeline steel and manufacture method thereof " etc. has been set forth China's long distance pipeline trunk main main X70 that adopts at present, X80 level pipe line steel and manufacture method thereof, under the existing transfer pressure condition of long distance pipeline (10MPa or 12MPa), these series product can satisfy the safe operation of long distance pipeline, but along with improving constantly that the long distance pipeline performance driving economy requires, pipe-line transportation pressure further improves, when the time comes X70, X80 level pipe line steel can't satisfy the security requirement of pipeline operation.
Number of patent application is 201210050624.5 Chinese invention patent " high strength low yield strength ratio X90 hot-rolled steel sheet and production method thereof ", number of patent application is 200810012150.9 Chinese invention patent " a kind of high strength X 100 pipeline steel hot rolled slab and production method thereof ", the patent No. is the Japanese patent of invention " X120 superstrength Welded Steel Pipe and manufacture method thereof " of JP2006233263, the patent No. is that the Japanese patent of invention " high strength welded steelpipe and manufacture method thereof with excellent aging performance " of JP2007023346 etc. has been set forth and adopted various heterogeneities designs, method in conjunction with TMCP explained hereafter superstrength X90～X120 level pipe line steel, this type of pipe line steel will have excellent application performance during at 12～18MPa when pipe-line transportation pressure, but further improve as pipe-line transportation pressure, will be difficult to satisfy the security requirement of pipeline operation equally.
Number of patent application is that 201010276430.8 Chinese invention patent " manufacture method of low yield strength ratio superstrength X130 pipe line steel and hot rolled slab thereof " has been set forth a kind of employing low C, high Mn, high Nb, the an amount of composition design of adding Cu, Cr, alloying elements such as Ni, Mo is in conjunction with the method for conventional TMCP explained hereafter X130 level pipeline steel plate.This production method can reach the high strength of 900MPa level pipe line steel, but does not add strengthening effect good and economic elements such as B, V, and the alloy designs cost is higher, is unfavorable for accomplishing scale production.
Number of patent application is that U.S.'s patent of invention of US5900075 has been described a kind of superstrength pipe line steel that promotes the Cu precipitation strength by thermal treatment; this method can reach the high strength of 900MPa level; but complex manufacturing, and the technology cost is higher, is unfavorable for realizing economical large-scale production.
Summary of the invention
The objective of the invention is in order to overcome in the prior art deficiency about high grade of steel pipe line steel intensity, can not satisfy the deficiency such as demand, cost of alloy height, production process complexity of following pressure piping, a kind of 900MPa grade super strength high tenacity pipeline steel plate and manufacture method thereof that is applicable to that following ultra-high voltage long distance pipeline trunk main is built is provided, this method production process is simple, manufacturing cost is lower, and every main mechanical performance index reaches: R
P0.2〉=900MPa, R
m〉=1050MPa, R
P0.2/ R
m≤ 0.90, unit elongation (A
50mm) 〉=12% ,-20 ℃ of KV
2〉=200J ,-15 ℃ of DWTT SA 〉=85%.
Realize the measure of above-mentioned purpose:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, the weight percent of its chemical ingredients is: C:0.035～0.065, Si:0.15～0.40, Mn:1.90～2.50, P :≤0.012, S :≤0.0015, Nb:0.030～0.055, Ti:0.010～0.025, Cu:0～0.30, Cr:0.35～0.60, Ni:0.10～0.50, Mo:0～0.50, Al:0.020%～0.050, B:0.0010～0.0030, N :≤0.0080, Ni/Cu 〉=0.5, Cr+Cu+Ni≤1.1, all the other are Fe and unavoidable impurities.
It is characterized in that: also be added with weight percent content and be≤0.30% Cu.
Produce the method for above-mentioned steel plate, mainly may further comprise the steps:
1) smelting also, continuous casting becomes base;
2) to the strand heating, the control Heating temperature is at 1050～1120 ℃; Guarantee the abundant solid solution of micro alloying element, prevent that simultaneously austenite crystal from too growing up;
3) carry out roughing: control roughing temperature is at 980～1090 ℃, and every time draft is not less than 10%, makes the abundant refinement of austenite crystal by dynamic and static recrystallize, suppresses austenite crystal simultaneously and grows up;
4) carry out finish rolling, the control final rolling temperature is at 750～920 ℃, and the accumulative total draft is not less than 70%, with the grain size inequality that prevents that the part recrystallize from causing, austenite crystal is fully flattened, form abundant deformation bands and be beneficial to forming core, organize after the refinement phase transformation;
5) cool off fast, the control speed of cooling is at 30～60 ℃/S, and final cooling temperature is no more than 200 ℃;
6) fast cold back stops 40～60S and aligns before straightener.
The mechanism of action of each element is as follows among the present invention:
Carbon (C) content is 0.035～0.065%, adds a certain amount of carbon, can significantly improve the intensity of steel, but when carbon content surpassed to a certain degree, the low-temperature flexibility of steel significantly worsened, thereby carbon content is defined as 0.035～0.065%.
Silicon (Si) content is 0.15～0.40%, mainly plays the solution strengthening effect, avoids simultaneously significantly worsening because adding excessive the moulding of steel, the toughness of causing.
Manganese (Mn) content is 1.90～2.50%, adds higher economic alloy element manganese, can significantly improve the intensity of steel, in addition, manganese is crystal grain thinning to a certain extent, improves the impelling strength of steel, but excessive manganese easily forms poly-partially, the composition and the tissue odds that cause steel.
Niobium (Nb) content is 0.030～0.055%, and niobium can significantly improve the austenite recrystallization temperature of steel, enlarges non-recrystallization district scope, be convenient to realize the high temperature controlled rolling, reduce mill load, the while niobium can also suppress austenite crystal grows up, and has significant refined crystalline strengthening and precipitation strength effect.But in high strength bainite steel, adds the generation that excessive niobium can promote the M-A island, reduce the toughness of welded heat affecting zone, and Nb belongs to noble metal, increase content and can significantly improve the alloy designs cost, therefore, with the content control of niobium at lower level.
Titanium (Ti) content is 0.010～0.025%, the effect in steel of titanium and niobium is similar, stronger refined crystalline strengthening and precipitation strength effect are arranged, the titanium of trace can also at high temperature be combined with carbon, oxygen, form the precipitate of high temperature infusibility, the austenite crystal that is conducive to suppress welded heat affecting zone is grown up, and significantly improves the toughness of welded heat affecting zone.
Nickel (Ni) content is 0.10～0.50%, and nickel can effectively improve the hardening capacity of steel, has certain solution strengthening effect, can also significantly improve the low-temperature flexibility of steel.In addition, the check crack that nickel can also effectively stop the red brittleness of Cu to cause, and significantly improve the corrosion resistance nature of steel.But nickel and molybdenum are similar, belong to noble metal, easily cause the manufacturing cost of steel significantly to improve, and in addition, too high nickel content easily causes the steel plate iron scale to be difficult to remove, and causes the plate surface quality problem.
The content of chromium (Cr) is 0.35～0.60%, and chromium can significantly improve the hardening capacity of steel, and has certain solution strengthening effect, can substitute valuable Alloy Elements Mo, Ni to a great extent.In addition, add weather-proof, corrosion resistance nature that certain chromium can also improve steel, but add excessively, easily cause the ductile-brittle transition temperature of steel significantly to rise.
The content of molybdenum (Mo) is 0.001～0.50%, molybdenum is significantly postponed γ → α and is changed, suppress ferrite and perlite forming core, promotion has the formation of the bainite/acicular ferrite of high density dislocation substructure, makes steel obtain bainite/acicular ferrite structure in rolling a back wideer cooling rate scope.For guaranteeing tissue, the performance uniformity of special thick specification pipeline steel plate thickness of slab direction, Mo content is controlled in higher level.But molybdenum belongs to noble metal, and add-on increases the manufacturing cost that can improve steel, and too high molybdenum also can cause the low-temperature flexibility of steel to worsen simultaneously.
The content of copper (Cu) is 0 ~ 0.30%, adds copper in right amount, improves intensity and the hardening capacity of steel, and can improve weather-proof, the corrosion resistance nature of steel.But copper is low melting point metal, easily causes hot-shortly, and it is unfavorable to add excessive low-temperature flexibility to steel.
The content of aluminium (Al) is 0.020～0.050%, and aluminium is deoxidant element main in the steel, can significantly reduce the oxygen level in the steel, and the combination of aluminium and nitrogen simultaneously forms AlN, crystal grain thinning effectively.But aluminium content surpasses at 0.05% o'clock in the steel, easily causes the oxide inclusion of aluminium obviously to increase, and reduces the cleanliness factor of steel, and is unfavorable to the low-temperature flexibility of steel.
The content of boron (B) is 0.0010～0.0030%, the B that adds trace can significantly suppress the forming core of ferrite on austenite grain boundary, also make the bainite transformation curve become flat simultaneously, even thereby in a bigger cooling rate scope, also obtaining bainite structure under the situation of low-carbon (LC), make pipe line steel reach very high intensity rank.But after add-on acquired a certain degree, the effect of B reached capacity, and caused the steel embrittlement easily, therefore the content of boron was controlled 0.0010～0.0030%.
Phosphorus (P), sulphur (S), nitrogen (N) content are respectively: [%P]≤0.012, [%S]≤0.0015, [%N]≤0.008.Phosphorus easily causes the cold short of steel, and sulphur easily causes hot-short, and nitrogen causes that easily the quenching inefficacy of steel and deformation lost efficacy, and causes the unstable properties of steel, therefore should reduce the content of phosphorus in the steel, sulphur, nitrogen as far as possible.
In addition, guarantee Ni/Cu 〉=0.5, allow low-melting Cu and Ni form the higher complete solid solution of fusing point, it is hot-short to prevent that low melting point Cu from causing.
Guarantee Cr+Cu+Ni≤1.1%, alloy content total amounts such as strict control chromium, copper, nickel reduce cost of alloy, guarantee that steel plate has good welding property.
The main technique effect is as follows among the present invention:
The present invention why with slab heating temperature at 1050～1120 ℃, be because by Theoretical Calculation and repeatedly laboratory test research, more than 1050 ℃, microalloy carbon/the nitrogen compound of steel grade can be fully solid molten, and when Heating temperature surpasses 1120 ℃, original austenite grain is sharply grown up, therefore the strict slab heating temperature interval that limits.
Why controlling in speed of cooling is 30～60 ℃/s, final cooling temperature control is being no more than 200 ℃, be because calculate and repeatedly laboratory study by Material Thermodynamics, when speed of cooling is 30～60 ℃/s, final cooling temperature control is below 200 ℃ the time, can effectively improve the intensity of steel of the present invention, fully refinement and malleableize cost tissue, obtains desirable by force, mould, toughness mates.
The present invention compared with prior art by adding the high-hardenability alloying elements such as B, Cr of less expensive, reduces the alloy consumption of noble metals such as Nb, Mo, Ni, can significantly reduce production costs, and enhances productivity.Indicate that through test metallographic structure of the present invention is the M-A tissue that desirable bainite+a small amount of disperse distributes, every main mechanical performance index reaches: yield strength (R
P0.2〉=900MPa), tensile strength (R
m) 〉=1050MPa, yield tensile ratio (R
P0.2/ R
m)≤0.90, unit elongation (A
50mm) 〉=12% ,-20 ℃ of KV
2〉=200J ,-15 ℃ of DWTT SA 〉=85%.
Embodiment
Below the present invention is described in detail:
Embodiment 1:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.035%, Si:0.21%, Mn:2.41%, P:0.012%, S:0.0014%, Nb:0.055%, Ti:0.019%, Cu:0.14%, Cr:0.47%, Ni:0.37%, Mo:0.32%, Al:0.043%, B:0.0028%, N:0.0073%, surplus is Fe and inevitably is mingled with.
Production craft step:
1) smelting also, continuous casting becomes base;
2) steel billet is heated to
1052 ℃;
3) carry out roughing after steel billet is come out of the stove, its start rolling temperature is
1031 ℃, each percentage pass reduction of roughing 〉=10%, the roughing end temp is
980 ℃;
4) treat after roughing finishes that temperature begins to carry out finish rolling to 920 ℃, the finish rolling end temp is 846 ℃, and finish rolling accumulative total draft is 80%;
5) steel plate finish rolling is carried out supper-fast cooling after finishing immediately, and final cooling temperature is 188 ℃, and rate of cooling is: 36.4 ℃/s;
6) steel plate carries out the brute force aligning through after the supper-fast cooling behind the stop 50s before straightener, makes required steel plate.
Embodiment 2:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.042%, Si:0.39%, Mn:2.50%, P:0.011%, S:0.0010%, Nb:0.051%, Ti:0.025%, Cu:0.30%, Cr:0.35%, Ni:0.42%, Mo:0.18%, Al:0.049%, B:0.0030%, N:0.0066%, surplus is Fe and inevitably is mingled with.
Production craft step:
1), smelting also, continuous casting becomes base;
2), steel billet is heated to 1105 ℃;
3), steel billet carries out roughing after coming out of the stove, its start rolling temperature is 1084 ℃, each percentage pass reduction of roughing is not less than 10%, the roughing end temp is 1066 ℃;
4), roughing treats that temperature begins to carry out finish rolling to 900 ℃ after finishing, the finish rolling end temp is 826 ℃, finish rolling accumulative total draft is 79.1%;
5), steel plate finish rolling carries out supper-fast cooling after finishing immediately, final cooling temperature is 188 ℃, rate of cooling is: 30.5 ℃/s;
6), steel plate is through after the supper-fast cooling, stops to carry out brute force behind the 45s and align before straightener, makes required steel plate.
Embodiment 3:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.048%, Si:0.34%, Mn:2.32%, P:0.010%, S:0.0011%, Nb:0.047%, Ti:0.015%, Cu:0%, Cr:0.60%, Ni:0.32%, Mo:0.36%, Al:0.032%, B:0.0026%, N:0.0060%, surplus is Fe and inevitably is mingled with.
Production craft step:
1) smelting also, continuous casting becomes base;
2) steel billet is heated to 1120 ℃;
3) carry out roughing after steel billet is come out of the stove, its start rolling temperature is 1090 ℃, and each percentage pass reduction of roughing is not less than 10%, and the roughing end temp is 1078 ℃;
4) treat after roughing finishes that temperature begins to carry out finish rolling to 890 ℃, the finish rolling end temp is 804 ℃, and finish rolling accumulative total draft is 80%;
5) steel plate finish rolling is carried out supper-fast cooling after finishing immediately, and final cooling temperature is 195 ℃, and rate of cooling is: 59.8 ℃/s;
6) steel plate carries out the brute force aligning through after the supper-fast cooling behind the stop 60s before straightener, makes required steel plate.
Embodiment 4:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.054%, Si:0.27%, Mn:2.15%, P:0.008%, S:0.0008%, Nb:0.042%, Ti:0.012%, Cu:0.19%, Cr:0.52%, Ni:0.28%, Mo:0.24%, Al:0.021%, B:0.0013%, N:0.0054%, surplus is Fe and inevitably is mingled with.
Production craft step:
1) smelting also, continuous casting becomes base;
2) steel billet is heated to 1083 ℃;
3) carry out roughing after steel billet is come out of the stove, its start rolling temperature is 1062 ℃, and each percentage pass reduction of roughing is not less than 10%, and the roughing end temp is 1036 ℃;
4) treat after roughing finishes that temperature begins to carry out finish rolling to 880 ℃, the finish rolling end temp is 794 ℃, and finish rolling accumulative total draft is 77.8%;
5) steel plate finish rolling is carried out supper-fast cooling after finishing immediately, and final cooling temperature is 166 ℃, and rate of cooling is: 43.2 ℃/s;
6) steel plate carries out the brute force aligning through after the supper-fast cooling behind the stop 40s before straightener, makes required steel plate.
Embodiment 5:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.059%, Si:0.15%, Mn:1.91%, P:0.007%, S:0.0005%, Nb:0.032%, Ti:0.010%, Cu:0.23%, Cr:0.43%, Ni:0.12%, Mo:0.50%, Al:0.028%, B:0.0010%, N:0.0046%, surplus is Fe and inevitably is mingled with.
Production craft step:
1) smelting also, continuous casting becomes base;
2) steel billet is heated to 1053 ℃;
3) carry out roughing after steel billet is come out of the stove, its start rolling temperature is 1030 ℃, and each percentage pass reduction of roughing is not less than 10%, and the roughing end temp is 983 ℃;
4) treat after roughing finishes that temperature begins to carry out finish rolling to 850 ℃, the finish rolling end temp is 752 ℃, and finish rolling accumulative total draft is 77.8%;
5) steel plate finish rolling is carried out supper-fast cooling after finishing immediately, and final cooling temperature is 182 ℃, and rate of cooling is: 46.9 ℃/s;
6) steel plate carries out the brute force aligning through after the supper-fast cooling behind the stop 50s before straightener, makes required steel plate.
Embodiment 6:
A kind of 900MPa grade super strength high tenacity pipeline steel plate, its chemical ingredients and weight percent are: C:0.065%, Si:0.24%, Mn:2.03%, P:0.006%, S:0.0007%, Nb:0.039%, Ti:0.017%, Cu:0.28%, Cr:0.48%, Ni:0.50%, Mo:0.0013%, Al:0.043%, B:0.0015%, N:0.0073%, surplus is Fe and inevitably is mingled with.
Production craft step:
1) smelting also, continuous casting becomes base;
2) steel billet is heated to 1078 ℃;
3) carry out roughing after steel billet is come out of the stove, its start rolling temperature is 1060 ℃, and each percentage pass reduction of roughing is not less than 10%, and the roughing end temp is 1034 ℃;
4) treat after roughing finishes that temperature begins to carry out finish rolling to 865 ℃, the finish rolling end temp is 777 ℃, and finish rolling accumulative total draft is 80%;
5) steel plate finish rolling is carried out supper-fast cooling after finishing immediately, and final cooling temperature is 100 ℃, and rate of cooling is: 52.5 ℃/s;
6) steel plate carries out the brute force aligning after stopping 60s through supper-fast cooling back before straightener, makes required steel plate.
The horizontal salient features detection statistics table of each embodiment of table 1
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (3)
1. 900MPa level ultra-high-strength/tenacity pipeline steel plate, its component and weight percent content are: C:0.035～0.065%, Si:0.15～0.40%, Mn:1.90～2.50%, P :≤0.012%, S :≤0.0015%, Nb:0.030～0.055%, Ti:0.010～0.025%, Cr:0.35～0.60%, Ni:0.10～0.50%, Mo:0.001～0.50%, Al:0.020%～0.050%, B:0.0010～0.0030%, N :≤0.0080%, Ni/Cu 〉=0.5%, Cr+Cu+Ni≤1.1%, all the other are Fe and unavoidable impurities.
2. a kind of 900MPa level ultra-high-strength/tenacity pipeline steel plate as claimed in claim 1 is characterized in that: also be added with weight percent content and be≤0.30% Cu.
3. produce the method for a kind of 900MPa level ultra-high-strength/tenacity pipeline steel plate as claimed in claim 1, the steps include:
1) smelting also, continuous casting becomes base;
2) to the strand heating, the control Heating temperature is at 1050～1120 ℃;
3) carry out roughing: control roughing temperature is at 980～1090 ℃, and every time draft is not less than 10%;
4) carry out finish rolling, the control final rolling temperature is at 750～920 ℃, and the accumulative total draft is not less than 70%;
5) cool off fast, the control speed of cooling is at 30～60 ℃/S, and final cooling temperature is no more than 200 ℃;
6) fast cold back stops 40～60S and aligns before straightener.
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| CN103695783A (en) * | 2013-12-23 | 2014-04-02 | 钢铁研究总院 | Ultra-low carbon bainite high-strength steel bar and production method thereof |
| CN104141099A (en) * | 2014-08-12 | 2014-11-12 | 北京首钢股份有限公司 | Manufacturing method of super-thick X70 hot-rolled plate coil |
| CN106048181A (en) * | 2016-07-27 | 2016-10-26 | 武汉钢铁股份有限公司 | Low-temperature thick-specification pipeline steel preparing method suitable for hot continuous rolling production line |
| CN106498263A (en) * | 2016-10-13 | 2017-03-15 | 南京创贝高速传动机械有限公司 | A kind of high-speed gear box is vented the production technology of Taper Pipe |
| CN107354375A (en) * | 2016-05-10 | 2017-11-17 | 本特勒尔钢管有限公司 | The guiding channel of fuel injection guide device and tubulose |
| CN114962815A (en) * | 2022-06-24 | 2022-08-30 | 中国重型机械研究院股份公司 | Pipeline system for ultrahigh pressure fluid transmission |
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