CN102021476A - Low-cost acid resistant pipeline steel hot-rolled plate and manufacturing method thereof - Google Patents
Low-cost acid resistant pipeline steel hot-rolled plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a low-cost acid resistant pipeline steel hot-rolled plate and a manufacturing method thereof. The hot-rolled plate consists of the following components in percentage by weight: 0.04 to 0.10 percent of C, 0.05 to 0.50 percent of Si, 1.00 to 1.70 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.08 percent of Nb, 0.005 to 0.030 percent of Ti, 0.010 to 0.050 percent of Als, 0.0010 to 0.0040 percent of Ca, less than or equal to 0.0060 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0010 percent of O, and the balance of Fe and inevitable impurities. The nonmetallic inclusions A/B/C/D are less than or equal to grade 2.0, and the pearlite belt tissues are less than or equal to grade 2.0. The manufacturing method for the hot-rolled plate is characterized by comprising the following steps of: directly feeding the components into a heating furnace at the temperature of between 500 and 850 DEG C after continuous casting is finished to perform heating, and discharging the heated product at the temperature of between 1,150 and 1,250 DEG C to perform rolling; controlling rolling of a rough mill and a finishing mill at two stages, wherein the final rolling temperature of rough rolling is between 950 and 1,050 DEG C, the final rolling temperature of finish rolling is between 770 and 870 DEG C, and the finish rolling compression ratio is more than 60 percent; and controlling cooling by adopting a laminar flow cooling device after rolling, wherein the cooling speed is 8 to 20 DEG C per second, and the final cooling temperature is between 550 and 700 DEG C.
Description
Technical field
The present invention relates to a kind of high-strength low-alloy steel, be specifically related to a kind of low-cost resistance to acid pipe line steel and hot-rolled coil manufacture method thereof.
Background technology
Pipe-line transportation be long apart from transfer oil, Sweet natural gas is most economical, safe, efficient and environmental transportation method, in the oil and gas conveying, the Primordial Qi transport of H between from the gas well to the gas gathering station
2S content is higher, and gas pipe line is in the sour environment for a long time, and common pipeline steel tube does not possess anti-HIC and anti-SSCC ability, contains H both at home and abroad
2The gas transmission line that S is higher, particularly oil-gas field gathering pipeline all adopt special-purpose resistance to acid pipe line steel steel pipe basically, to guarantee the operating safety of gas transmission line.
Resistance to acid pipe line steel steel pipe is generally followed the 44th edition (ISO 3183-2007) appendix H of API API SPEC 5L standard requirement, for satisfying the resistance to acid related request, except high strength, high tenacity and weldability that conventional pipe line steel requires, also resist HIC and the SSCC ability has proposed independent requirement, therefore the resistance to acid pipe line steel must reduce harmful element content such as P, S, the control inclusion morphology also will guarantee homogeneity of structure simultaneously.
The patent of invention comparatively approaching with the present invention has: 1) Chinese patent, publication number CN1811002A, " X 65 pipeline steel for use in acid condition and manufacture method thereof "; 2) Chinese patent, publication number CN 1914341A, " pipe line steel that anti-HIC is good and the line pipe that produces with these steel "; 3) Chinese patent, publication number CN 1715435A, " having anti-HIC performance X80 pipe line steel and hot rolled plate making process thereof "; 4) Chinese patent, publication number CN1948538A, " petroleum steel pipe of anti-H 2 S stress corrosion and manufacture method thereof "; 5) Chinese patent, publication number CN 1351189A, " a kind of Ultra-low carbon high tenacity anti-H 2 S steel for gas delivering pipeline "; 6) Chinese patent, publication number CN 101418421A, " a kind of hydrogen sulfide corrosion resistant high intensity oil casing tube and manufacture method thereof "; 7) Japanese Patent, the spy opens flat 2006-274338, " the high-strength Electric Welded Steel Pipe of resistance to acid coil of strip and manufacture method thereof "; 8) Japanese Patent, the spy opens flat 2002-327212, " tubulation pipeline steel roll and manufacture method thereof "; 9) Japanese Patent, the spy opens flat 2005-240051, " resistance welded pipe resistance to acid high-toughness hot-rolled steel sheet and manufacture method thereof ".
The disclosed resistance to acid pipe line steel of above patent documentation partly is weldless steel tube or hot-rolled steel sheet, and rest part is roll bending but can not possesses anti-HIC simultaneously and anti-SSCC performance, also needs to add valuable alloying elements such as Ni, Cu, Mo, cost height simultaneously; Its continuous casting steel billet carries out heating rolling production after need rolling off the production line and clearing up again, and heat energy loss is big, and the production cycle is long, the production cost height.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low-cost alloy designs, and control inclusion and banded structure in the steel effectively, adopt vanguard technologies such as continuous casting and rolling simultaneously, manufacture resistance to acid line steel hot rolling roll bending and manufacture method thereof more economically with anti-HIC and anti-SSCC ability.
Technical scheme of the present invention is, propose a kind of little Ti and handle the design of C-Mn-Nb composition, its be organized as tiny ferrite+a small amount of pearlitic structure pipe line steel, the weight percent of its moiety (%) is: C:0.04-0.10, Si:0.05-0.50, Mn:1.00-1.70, P≤0.015, S≤0.002, Nb≤0.08, Ti:0.005-0.030, Als:0.010-0.050, Ca:0.0010-0.0040, N≤0.0060, H≤0.0002, O≤0.0010, surplus are Fe and inevitable impurity.
The composition design philosophy of low-cost resistance to acid pipe line steel is that the C-Mn-Nb that adopts little Ti to handle is an alloy system, adopt smelting Technology for Clean Steel effectively to reduce harmful elements such as P, S, change inclusion morphology by the Ca treatment process, thermo-mechanical rolling technology obtains uniform tiny ferrite+a small amount of pearlitic structure, and control the generation of banded structure effectively, to guarantee that the resistance to acid pipe line steel is when having high-intensity high-tenacity, have good anti-HIC and anti-SSCC performance, its principal element, nonmetal inclusion and banded structure select control the reasons are as follows:
C：0.04％-0.10％；
C is effective, the most most economical strengthening element, and along with the massfraction increase of C, intensity, hardness increase thereupon, but to H
2S susceptibility also increases thereupon, is easy to cause HIC and SSCC.Therefore C on be limited to 0.10%.Preferably C content is 0.05%-0.08%.
Mn：1.00％-1.70％；
Mn is effective strengthening element, can improve the hardening capacity of steel, causes solution strengthening, remedies the strength degradation that low-carbon (LC) or ultra low-carbon steel cause.But when the Mn element is excessive, component segregation taking place easily, is formed centrally the perlite band in thickness of slab, when banded structure 〉=2.0%, generally can not be by HIC and SSCC test.Therefore Mn content on be limited to 1.70%, best Mn content is 1.20%-1.60%.
P：≤0.015％；
The segregation of P also impels hydrogen induced cracking to form.Steel in process of setting, the rich P in dendrite gap.P is rising A
3The element of point, thus hot rolling when cooling generate ferrite here earlier, and the C dentrite limb of being ostracised, and generate perlite, thus cause the ferrite-pearlite banded structure of P segregation, make H
2S susceptibility strengthens.So P content≤0.015%, preferably P content≤0.010%.
S：≤0.002％；
S is as harmful element, and being mingled with Mn generation MnS is H
2The easiest accumulative of H position among the S promotes crackle to produce.Therefore the S content of antiacid pipe line steel must be controlled at lower level, suppress MnS and be mingled with generation.S content answers≤0.002%, preferably P content≤0.001%.
Nb：0.02％-0.08％；
Nb is one of most important element in the modern low alloy steel, and is fairly obvious to the effect of crystal grain thinning.Niobium has effects such as precipitation strength, inhibition austenite recrystallization, prevention grain growth in steel, thereby is obtaining application widely, answers≤0.08% according to thermodynamics solubility product formula to calculating Nb content, best Nb content 0.02-0.06%.
Ti：0.005％-0.030％；
Ti can form TiN with nitrogen and stop austenite crystal to be grown up, but the original grain before the refinement open rolling; The Ti that separates out in the austenite high-temperature zone when rolling (CN) particle blocks austenitic recrystallization process, final refinement ferrite crystal grain.So Ti content 0.005%-0.030%, preferably Ti content 0.008%-0.020%.
Ca：0.0010％-0.0040％；
Ca can change the form of inclusion, makes it to become the dispersive spherule, thereby improves the capacity antacid of steel.But the massfraction of Ca must accurately be controlled within the specific limits, to avoid generation to H
2The sulfide of the Ca of S sensitivity or oxide compound.So Ca content 0.0010%-0.0040%, preferably 0.0015%-0.0035%.
H：≤0.0002％；
The massfraction of H in the resistance to acid pipe line steel is high more, to H
2S is responsive more, and corrosion rate is high more, and the probability that cracks is high more, therefore must adopt RH vacuum-treat control hydrogen richness≤0.0002%.
O：≤0.0010％；
Oxide inclusion in the steel also is to cause the resistance to acid pipe line steel reason of number of drawbacks to occur, and molten steel should pass through good deoxidation, and prevents secondary oxidation.Therefore must adopt RH vacuum-treat control oxygen level≤0.0010%.
Non-metallic inclusion: A/B/C/D type impurity≤2.0 grade;
The form of non-metallic inclusion and distribution directly affect the resistance to acid performance of steel, hydrogen produces at the tip of inclusion easily to be assembled, particularly MnS is mingled with, after the hot rolling, the MnS that is elongated that distributes along rolling direction is mingled with, because its thermal expansivity is greater than matrix metal, so will cause the space after the cooling around it, be that hydrogen gathers the place well, become the crack initiation source.Therefore must reduce S content on the one hand, make S≤0.002%; By the Ca processing MnS is mingled with on the other hand and carries out complete nodularization.Therefore A/B/C/D type impurity≤2.0 grade, preferably A/B/C/D type impurity≤1.0 grades.
Banded structure≤2.0 grade;
Because in the hydrogen process of osmosis, hydrogen is caught by the perlite band, after hydrogen atom reached threshold value in the trap, hydrogen induced cracking just germinated at the banded structure place.Because perlite band and ferritic phase knot place are good defeated hydrogen channels, dislocation desity increases behind the steel rolling simultaneously, can quicken the diffusion of hydrogen atom along the dislocation pipeline, and this has just promoted hydrogen induced cracking to expand along banded structure.In case hydrogen induced cracking forms, the plastic zone of splitting point just has slip band to produce, and slip band and perlite intersection have a large amount of dislocations generations again, and with the hydrogen group of high density, can form bigger crackle.Therefore banded structure is to H
2Ten fens sensitivities of S must be with banded structure≤2.0 grade, preferably banded structure≤1.0 grades.
Another technical scheme of the present invention is the manufacture method that proposes a kind of resistance to acid line steel hot rolling roll bending.Its production technique is: hot metal pretreatment-converter smelting-external refining (processing of RH+LF+ calcium)-continuous casting-slab heating-controlled rolling-controlled chilling-curl.
1) smelt continuous casting process:
Hot metal pretreatment: disperse the smelting function of converter, alleviate the desulfurization burden of converter, effectively reduce S content in the molten steel by desulphurization and slag skimming.
Converter smelting:, go P to take off N effectively through top blast or top bottom blowing.
External refining: through RH handle, the dark desulfurization of LF stove is handled and carry out calcium and handle with dehydrogenation and oxygen, the control inclusion morphology.
Continuous casting: can adopt induction stirring or dynamically gently depress raising continuous casting steel billet inner quality.
2) casting and rolling process: continuous casting finishes the back and directly enters the process furnace heating 500-850 ℃ of temperature, and coming out of the stove for 1150-1250 ℃ is rolled.
3) thermo-mechanical rolling (TMCP) technology: carry out the controlled rolling of two stages through roughing mill and finishing mill, 950-1050 ℃ of roughing finishing temperature, 770-870 ℃ of finish rolling finishing temperature, finish rolling compression ratio＞60%, roll the back and adopt cooling facility for laminar flow to carry out controlled chilling, cooling rate 8-20 ℃/s, final cooling temperature 550-700 ℃, cooling is curled after finishing, and guarantees the homogeneity of structure of steel.
The resistance to acid line steel hot rolling roll bending that adopts the present invention to produce can carry out vertical masonry joint resistance welding (ERW), spiral submerged arc welded (SSAW), perhaps opens to carry out vertical masonry joint union-melt weld (LSAW) after flat and make steel pipe.Press the API5L standard code, above-mentioned steel pipe can satisfy the performance requriements of B-X65 grade of steel, can also satisfy simultaneously in the API5L standard antagonism HIC performance demands among the appendix H: when assessing anti-hydrogen induced cracking (HIC) test at A solution (environment), the responsive rate (CSR)≤2% of crackle, crack length rate (CLR)≤15%, crack thickness rate (CTR)≤5%; And satisfy antagonism SSCC performance demands simultaneously: in test(ing) medium, take out the SSCC sample, should under the low-power microscope of * 10 magnifications, check by the stretching face to sample.Stretch the surface without any surface cracking or crackle.
Description of drawings
Fig. 1 resistance to acid pipe line steel of the present invention banded structure figure;
Fig. 2 resistance to acid pipe line steel of the present invention metallographic structure figure.
Embodiment
Below the specific embodiment of the present invention is described further:
Table 1 is the chemical ingredients of test steel, and table 2 is the mechanical property of test steel, and table 3 is the anti-HIC performance of test steel, table 4 is the anti-SSCC performance of test steel, its technical process is, continuous casting finishes the back and directly enters the process furnace heating 500-850 ℃ of temperature, and coming out of the stove for 1150-1250 ℃ is rolled; Carry out the controlled rolling of two stages through roughing mill and finishing mill, 950-1050 ℃ of roughing finishing temperature, 770-870 ℃ of finish rolling finishing temperature, finish rolling compression ratio＞60%, roll the back and adopt cooling facility for laminar flow to carry out controlled chilling, cooling rate 8-20 ℃/s, final cooling temperature 550-700 ℃.Concrete process system: Heating temperature 1150-1250 ℃, the roughing finishing temperature is 950-1050 ℃, and the finish rolling finishing temperature is 770-870 ℃, and final cooling temperature is 550-700 ℃, and speed of cooling is 8-20 ℃/s.
Table 1 embodiment test steel chemical composition (Wt, %)
Table 2 embodiment tests steel mechanical property
Annotate: the sampling direction of 1) stretching, impact, drop weight test sample is laterally.
2) specification＞10mm impact specimen 10 * 10 * 55mm; Specification 7.5-10mm impact specimen 7.5 * 10 * 10mm; Specification 5.0-7.5mm impact specimen 5 * 10 * 10mm.
Table 3 embodiment tests the anti-HIC performance of steel
Table 4 embodiment tests the anti-SSCC performance of steel
By table 2-4 as seen, production resistance to acid line steel hot rolling roll bending of the present invention, not only has good comprehensive mechanical properties, can satisfy the requirement of API5L standard B-X65 grade of steel, and have good anti-HIC and anti-SSCC performance, can satisfy anti-HIC and the anti-SSCC requirement of API5L standard appendix H to acid pipe line steel.
Claims (4)
1. low-cost resistance to acid line steel hot rolling roll bending, it is characterized in that: the weight percent of its moiety (%) is: C:0.04-0.10, Si:0.05-0.50, Mn:1.00-1.70, P≤0.015, S≤0.002, Nb≤0.08, Ti:0.005-0.030, Als:0.010-0.050, Ca:0.0010-0.0040, N≤0.0060, H≤0.0002, O≤0.0010, surplus is Fe and inevitable impurity, non-metallic inclusion A/B/C/D type impurity≤2.0 grades, perlite banded structure≤2.0 grade.
2. low-cost resistance to acid line steel hot rolling roll bending according to claim 1 is characterized in that: non-metallic inclusion A/B/C/D type impurity≤1.0 grades, perlite banded structure≤1.0 grade.
3. claim 1 or 2 described low-cost resistance to acid line steel hot rolling roll bending manufacture method, comprise hot metal pretreatment-converter smelting-external refining-continuous casting-slab heating-rolling-cooling-curl, it is characterized in that: continuous casting finishes the back and directly enters the process furnace heating 500-850 ℃ of temperature, and coming out of the stove for 1150-1250 ℃ is rolled; Carry out the controlled rolling of two stages through roughing mill and finishing mill, 950-1050 ℃ of roughing finishing temperature, 770-870 ℃ of finish rolling finishing temperature, finish rolling compression ratio＞60%, roll the back and adopt cooling facility for laminar flow to carry out controlled chilling, cooling rate 8-20 ℃/s, final cooling temperature 550-700 ℃.
4. low-cost resistance to acid line steel hot rolling roll bending manufacture method according to claim 3 is characterized in that: adopt induction stirring in the casting process or dynamically gently depress.
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| CN115466830B (en) * | 2022-09-20 | 2024-03-22 | 包头钢铁（集团）有限责任公司 | Method for improving Q355ME wind power steel band structure |
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Application publication date: 20110420 |