CN103160752B - High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof - Google Patents
High strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a high strength seamless steel pipe with excellent low temperature toughness and manufacturing method thereof. The steel pipe comprises 0.15%-0.20% of C, 0.20%-0.30% of Si, 0.2%-0.5% of Mn, no more than 0.010% of P, no more than 0.003% of S, 0.6%-0.8% of Cr, 0.4%-0.7% of Mo, 1.0%-1.4% of Ni, 0.01%-0.035% of Nb, 0.01-0.05% of Als and the balance of Fe. The method comprises steps of: (1) smelting: pretreated molten iron with sulfur no more than 0.005%; and after smelting: P<=0.010%, S<=0.003%, O<=0.002%, N<=0.006% and H<=0.0002%; (2) manufacturing of round billet: degree of superheat of continuous casting superheat of square billet less than 30 DEG C, casting speed fluctuation less than 0.05m / min, straightening temperature higher than 950 DEG C and square billet heating temperature of 1300-1340DEG C; (3) steel pipe molding: billet heating temperature of 1250-1300 DEG C, piercing temperature higher than 1200 DEG C, continuous rolling temperature higher than 1050 DEG C, and sizing and reducing temperature higher than 800DEG C; and (4) heat treatment: quenching temperature of 900-920 DEG C, tempering temperature of 500-600 DEG C and tempering time longer than 60 min. The product provided by the invention has yield strength of 125ksi, and -60DEG C impact energy greater than 40J.
Description
Technical field
The invention belongs to manufacture field of low alloy steel, particularly relating to a kind of yield strength is the excellent low-alloy seamless steel pipe of the low-temperature impact toughness of 125ksi (862MPa) rank and manufacture method thereof.
Background technology
Along with industrialized development, world energy sources growing tension, people start to consider to obtain the energy from the land of cold and seabed, and mechanical means construction in cold environments and petroleum drilling and mining, transport are badly in need of the High Strength Steel with excellent low temperature impact toughness.And major part commercially available existing low-carbon (LC) and middle carbon high-strength steel due to its toughness during intensity height lower, such as, Q125 steel grade oil well casing in API Spec 5CT, though intensity can reach 125ksi, but toughness index can only reach 0 DEG C of horizontal 20J, longitudinal 41J, when operation envrionment temperature reduces further, then its impelling strength is difficult to meet the demands, therefore, use under cryogenic, they can only be processed into comparatively low strength, to obtain higher toughness, this will cause the increase of steel product cross-sectional thickness, the weight of product is increased, cost when its cost will be caused to be fully utilized than high-strength steel potentiality is high.For this reason, publication number a kind of high strength dual phase steel plate with excellent low temperature toughness that has been the patented invention of CN1098359C, but its intensity can only ensure that tensile strength is not less than 830MPa; Equally, publication number is that the yield strength of high-strength and high ductility steel plate of the Japanese Patent invention of JP1985121219 (A) can only reach 700MPa; Though publication number is CN 1148416A, the intensity of high-strength and high ductility steel plate disclosed in the patent of CN 101548026A and CN 1146784A and low-temperature flexibility more satisfactory, but its composition, organizational controls harshness, production control difficulty is larger, large production is difficult to the stability contorting ensureing product performance, simultaneously, because the compound of the alloys such as Nb, V, Ti, Mo, B, Cu, Mn, Ni adds, increase the control difficulty of surface quality of continuously cast slab; Similar board technology also has publication number to be the patent such as CN 1087357C, CN 1087356C, CN 1986861A, but either performance is excellent not, or production control difficulty is large, is difficult to realize industrialization stably manufactured and stable application.The high-strength and high-toughness steel of above publication invention limits due to composition, is only suitable for producing plate, band, and the fluctuation of weldquality and welded heat affecting zone tissue, performance is the large inferior position of one.And publication number is the Chinese patent of CN 101343715A, the yield strength of the weldless steel tube of disclosed excellent in low temperature toughness can only reach 70ksi.
In a word, although can provide a kind of steel pipe and the manufacture method with better low-temperature flexibility, also there is following deficiency in above disclosed patent:
1) publication number be the patent of CN 1098359C, the publication number Japanese Patent that is JP1985121219 (A), the publication number Chinese patent that is CN 1986861A, when obtaining better low-temperature flexibility, the intensity of steel can not reach more than 100ksi.And invention product is welded tube, the fluctuation of weldquality and welded heat affecting zone tissue, performance exists as Hazard Factor all the time.
2) publication number is CN 1087356C, the patent of CN 1087357C and publication number be the patent of CN1146784A, CN 1148416A, CN 101548026A, though claim and can obtain height and the steel plate that has concurrently of superior low-temperature toughness, but the control difficulty of product manufacture is large, and the quality of the product under industrial process conditions, the stability of performance not easily realize.And invention product is welded tube, the fluctuation of weldquality and welded heat affecting zone tissue, performance is another potential Hazard Factor.
3) publication number is the Chinese patent of CN 101343715A, discloses a kind of weldless steel tube and manufacture method thereof of excellent in low temperature toughness, avoids the impact of welding on steel tube performance, mass uniformity, but uses only for the situation of below yield strength 70ksi.
Summary of the invention
The object of the invention is to overcome the defect existing for above-mentioned prior art, there is provided a kind of yield strength reach 125ksi (862MPa) and more than,-60 DEG C of impelling strength can reach more than 40J, the mechanical means of constructing under being applicable to cold environment or the low-alloy seamless steel pipe of petroleum drilling and mining and manufacture method thereof.
For realizing the present invention, inventors control from alloying element screening with proportioning, steel cleanliness factor, the experimental study of system has in a large number been carried out in process optimization and several aspect such as Selecting parameter, organization optimization, finally determine and can meet the object of the invention alloying element proportioning and manufacturing process.
The present invention is achieved in that the composition of the high-strength seamless steel pipe of this excellent in low temperature toughness by weight percentage: C:0.15% ~ 0.20%, Si:0.20% ~ 0.30%, Mn:0.2% ~ 0.5%, P :≤0.010%, S :≤0.003%, Cr:0.6% ~ 0.8%, Mo:0.4% ~ 0.7%, Ni:1.0% ~ 1.4%, Nb:0.01% ~ 0.035%, Als:0.01% ~ 0.05%, N :≤0.006%, O≤0.002%, H≤0.0002%, all the other are Fe and inevitable impurity.
The explanation that each alloying element scope of the present invention is selected:
C: the Main Function of carbon improves hardening capacity, can improve intensity with the carbide that in steel, other adds up to element to be formed, carbon content is lower than 0.15%, and the hardening capacity of steel and intensity are difficult to ensure, but carbon can play destruction to the toughness of steel, carbon is difficult to ensure higher than 0.20% low-temperature flexibility.
Si: silicon mainly plays desoxydatoin here, but it is comparatively large to toughness infringement, therefore be limited in 0.20 ~ 0.30% scope.
Mn: manganese can improve hardening capacity, MnS is combined into the S element in steel, can avoid the hot short generation of steel, simultaneously Mn can expand the austenitic area of steel, can crystal grain thinning, play the effect of the obdurability improving steel, content lower than 0.2% time act on not obvious, when content is more than 0.5%, impel harmful element to start obviously in the effect of Grain Boundary Segregation, reduce the toughness of high-strength tubing, make steel easily produce H 2 S stress corrosion simultaneously.
P: phosphorus, at grain boundary segregation, raises ductile-brittle transition temperature, reduces the toughness of steel, must be limited to less than 0.01% here.
S: sulphur easily forms non-rigid with manganese etc. and is mingled with, along rolling direction generation extensional in the course of processing, the continuity of destruction material matrix, reduction steel pipe toughness index.Here less than 0.003% must be limited to.
Cr: chromium improve hardening capacity, improve the obdurability of steel, and there is anti-corrosion effect, lower than 0.6% time obdurability coupling bad, higher than 0.8% time, saturated to the improvement result of obdurability, cost increase.
Mo: molybdenum improves hardening capacity, improves steel belt roof bolt drag, suppresses temper brittleness, and its Grain refinement is obvious, and comparatively large to the obdurability effect improving steel, content is lower than 0.4%, and obdurability is difficult to meet the demands, and higher than 0.7% declines, cost increases.
Als: aluminium adds as strong reductor on the one hand, on the other hand can crystal grain thinning, improves the toughness of steel, in steel acid-soluble aluminum content lower than 0.01% time effect not enough, saturated higher than 0.05% effect, and increase and form Al
2o
3the tendency of inclusion increases, unfavorable to the low-temperature flexibility of steel.
Ni: nickel is the important alloying element added in steel of the present invention, adds nickel and can promote that commutative Banach aglebra occurs in steel, reduce ductile-brittle transition temperature.One of austenite stable element that nickel is still the strongest, can improve hardening capacity and the homogeneity of structure of steel.Reach object of the present invention, the addition of nickel is at least 1.0%, and simultaneously because nickel expensive, scarcity of resources, the upper limit of regulation nickel content is 1.4% in the present invention.
Nb: niobium improves the intensity of steel of the present invention by precipitation strength, improves the toughness of steel simultaneously by crystal grain thinning.When Nb content lower than 0.01% time act on not obvious, when the content of Nb is more than 0.035% to the contribution of intensity close to saturated, and damage the low-temperature flexibility of steel, reduce the thermoplasticity of steel of the present invention simultaneously.Therefore, the content range limiting Nb is 0.01% ~ 0.035%.
N, O, H: nitrogen, oxygen, hydrogen, as the harmful element in steel, need limit its content in steel, otherwise, affect the toughness of steel.
The manufacture method of the high-strength seamless steel pipe of excellent in low temperature toughness of the present invention comprises the following steps:
(1) smelting of steel
Adopt the smelting technology route of hot metal pretreatment+converter smelting+LF refining+VD vacuum outgas, sulphur content is controlled to less than 0.005% by hot metal pretreatment, preferably controls to less than 0.002%, ensures that high-quality low-sulfur molten iron is supplied to converter; Converter adopts top, the multiple oxygen blast gas smelting molten steel in the end, the content of smelting Technology for Clean Steel control P, S, O, N, H harmful element is adopted to be not more than 0.010%, 0.003%, 0.002%, 0.006%, 0.0002% successively, wherein the time of LF refining is not less than 30min, and the time that vacuum outgas adds blowing argon gas stirring is not less than 10min;
(2) circular pipe blank manufacture
For improving the obdurability of material matrix; circular pipe blank adopts the mode of bloom continuous casting+circle base rolling to manufacture; billet continuous casting adopts protection casting+induction stirring; control superheating temperature and be less than 30 DEG C; control induction stirring electric current and be greater than 500A; pulling rate stability is controlled; fluctuation range is no more than 0.05m/min; control straightening temperature more than 950 DEG C simultaneously; brittle zone is avoided to align; send into soaking pit after continuous casting square billet rolls off the production line to heat, Heating temperature 1300 ~ 1340 DEG C, carry out the circular pipe blank that roughing cogging and finish rolling are rolled into desired size afterwards.
(3) steel pipe forming
Circular pipe blank adopts rotary heating furnace heating, two roller cone mills make hollow billet, MPM/PQF Continuous mill train tube rolling, tiny-tension reducing unit sizing, it is cold to roll laggard line space, wherein ring furnace Heating temperature 1250 ~ 1300 DEG C, hot piercing temperature is not less than 1200 DEG C, hot continuous rolling temperature is not less than 1050 DEG C, sizing temperature is not less than 800 DEG C, rolls rear steel pipe air cooling; Preferably steel pipe is adopted determine tube reducing after tube rolling before and reheat samming process, with refinement, evenly steel pipe tissue;
(4) thermal treatment
Adopt Tempering and Quenching mode, quenching temperature 900 ~ 920 DEG C, quenchant is water, steel pipe tempering temperature 500 ~ 600 DEG C, and tempering time is not less than 60 minutes, adopts the band temperature correction being not less than 300 DEG C straight after Steel Pipe Heat process.
Weldless steel tube through above-mentioned manufacture technics has following performance:
Yield strength: > 862MPa tensile strength: > 931MPa
Impelling strength: laterally full-scale Charpy-V impact power (-60 DEG C) > 40J
Longitudinally full-scale Charpy-V impact power (-60 DEG C) > 60J
Unit elongation > 18%.
Manufacturing process of the present invention is simple, be easy to realize, the homogeneity of weldless steel tube performance, good stability, be applicable to cold environment use, yield strength 125ksi (862MPa) can be met, user demand that-60 DEG C of ballistic works are greater than 40J, adopt weldless steel tube of the present invention that welding tubing can be avoided to fluctuate the potential application risk caused due to weld seam, heat affected zone Performance and quality.
Embodiment
Below by embodiment, the present invention is further illustrated.
Adopt the Clean Steel smelting technology of hot metal pretreatment+converter smelting+LF refining+VD vacuum outgas, molten iron sulphur≤0.0012%.
Protective casting with induction stirring is carried out to the molten steel with composition in table 1; continuous casting becomes the square billet of 280 × 380mm; control superheating temperature during casting and be less than 30 DEG C; control induction stirring electric current and be more than or equal to 500A; pulling rate fluctuation range is controlled within 0.05m/min, controls straightening temperature and be not less than 950 DEG C.Enter the heating and thermal insulation that soaking pit carries out 1300 ~ 1340 DEG C after continuous casting square billet rolls off the production line, then be rolled into the circular pipe blank of φ 210 size through roughing cogging and finish rolling, need also to roll into the different size such as φ 200, φ 185 according to fished pipe specification.
Circular pipe blank rolling obtained is cut off into required scale and is entered rotary heating furnace heating, the steel pipe successively after two roller cone mill polings, MPM/PQF Continuous mill train tube rolling, rolling optionally carries out reheating samming process, 14 frame Minimal Tensions fixed/tube reducing unit sizing, roll after air cooling.Wherein ring furnace Heating temperature 1250 ~ 1300 DEG C, hot piercing temperature is not less than 1200 DEG C, and hot continuous rolling temperature is not less than 1050 DEG C, and sizing temperature is not less than 800 DEG C, obtains matrix and the precipitated phase of refinement.
Obtained hot finished steel pipe is carried out to the temper of the Water Quenching+550 ~ 600 DEG C of 900 ~ 920 DEG C, the steel pipe band temperature going out tempering stove is aligned, and straightening temperature is not less than 300 DEG C.
Finally, steel pipe carries out every inspection and the tube end maching such as detect a flaw, packaging warehouse-in.
The chemical composition of product is as shown in table 1, and the main production parameter of employing is in table 2 and table 3, and the mechanical property through φ 177.8 × 15.88mm weldless steel tube of above-mentioned manufacture technics is as shown in table 4.
The chemical composition (wt%) of table 1 embodiment of the present invention steel pipe
| Embodiment | C | Si | Mn | P | S | Cr | Mo | Ni | Nb | Als | H | O | N |
| 1 | 0.16 | 0.27 | 0.33 | 0.005 | 0.002 | 0.69 | 0.65 | 1.23 | 0.012 | 0.040 | 0.0001 | 0.0015 | 0.0046 |
| 2 | 0.15 | 0.30 | 0.45 | 0.006 | 0.001 | 0.74 | 0.70 | 1.02 | 0.025 | 0.027 | 0.00009 | 0.0017 | 0.0049 |
| 3 | 0.18 | 0.21 | 0.50 | 0.009 | 0.003 | 0.80 | 0.52 | 1.31 | 0.032 | 0.012 | 0.00008 | 0.0020 | 0.0041 |
| 4 | 0.20 | 0.024 | 0.21 | 0.007 | 0.002 | 0.62 | 0.43 | 1.40 | 0.016 | 0.035 | 0.00011 | 0.0014 | 0.0039 |
| Comparative example | 0.28 | 0.35 | 1.20 | 0.012 | 0.004 | 1.12 | 0.38 | - | - | 0.031 | 0.10 | 0.0024 | 0.0061 |
The main technologic parameters of the steel-making of table 2 embodiment of the present invention and base
| Embodiment | Superheating temperature/DEG C | Induction stirring electric current/A | Pulling rate fluctuation/m/min | Straightening temperature/DEG C | Continuous blank heating temperature/DEG C |
| 1 | 26 | 505 | 0.03 | 955 | 1305 |
| 2 | 23 | 500 | 0.04 | 970 | 1335 |
| 3 | 24 | 505 | 0.02 | 960 | 1320 |
| 4 | 27 | 505 | 0 | 970 | 1315 |
| Comparative example | 25 | 500 | 0 | 965 | 1310 |
Table 3 embodiment of the present invention tubulation and thermal treatment main technologic parameters
| Embodiment | Perforation/DEG C | Tube rolling/DEG C | Reheat/DEG C | Sizing/DEG C | Quenching temperature, time/DEG C, min | Tempering temperature, time/DEG C, min |
| 1 | 1220 | 1100 | - | 854 | 910，45 | 560，60 |
| 2 | 1245 | 1080 | - | 862 | 920，45 | 550，60 |
| 3 | 1230 | 1120 | - | 867 | 900，45 | 580，90 |
| 4 | 1235 | 1090 | 900 | 881 | 900，45 | 600，90 |
| Comparative example | 1225 | 1100 | - | 860 | 900，45 | 630，90 |
The mechanical property of table 4 embodiment of the present invention steel pipe
Claims (3)
1. the manufacture method of a high-strength seamless steel pipe, it is characterized in that: described high-strength seamless steel pipe composition by weight percent is: C:0.15% ~ 0.20%, Si:0.20% ~ 0.30%, Mn:0.2% ~ 0.5%, P :≤0.010%, S :≤0.003%, Cr:0.6% ~ 0.8%, Mo:0.4% ~ 0.7%, Ni:1.0% ~ 1.4%, Nb:0.01% ~ 0.035%, Als:0.01% ~ 0.05%, N :≤0.006%, O≤0.002%, H≤0.0002%, all the other are Fe and inevitable impurity; Its manufacture method comprises the following steps: the (1) smelting of steel: sulphur content≤0.005% after hot metal pretreatment, P content≤0.010%, S content≤0.003%, O content≤0.002%, N content≤0.006%, H content≤0.0002% after smelting, LF refining time is greater than 30min, and vacuum outgas adds blowing argon gas churning time and is greater than 10min; (2) circular pipe blank manufacture: bloom continuous casting adopts protection casting+induction stirring, control superheating temperature and be less than 30 DEG C, induction stirring electric current is more than or equal to 500A, pulling rate fluctuation range is no more than 0.05m/min, straightening temperature is more than 950 DEG C, continuous casting square billet send soaking pit Heating temperature 1300 ~ 1340 DEG C, then is rolled into the circular pipe blank of desired size through roughing cogging and finish rolling; (3) steel pipe forming: circular pipe blank makes hollow billet through rotary heating furnace heating, two roller cone mills, Heating temperature 1250 ~ 1300 DEG C, piercing temperature is greater than 1200 DEG C, again through MPM/PQF Continuous mill train tube rolling, tandem rolling temperature is greater than 1050 DEG C, tiny-tension reducing unit sizing with temperature is greater than 800 DEG C, rolls rear air cooling; (4) thermal treatment: quenching temperature 900 ~ 920 DEG C, tempering temperature 500 ~ 600 DEG C, tempering time is greater than 60 minutes, adopts the band temperature correction being greater than 300 DEG C straight afterwards.
2. the manufacture method of high-strength seamless steel pipe according to claim 1, is characterized in that sulphur content 0.002% after hot metal pretreatment.
3. the manufacture method of high-strength seamless steel pipe according to claim 1, adopts steel pipe before it is characterized in that determining tube reducing after tube rolling and reheats samming process.
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| CN114045438B (en) * | 2021-11-17 | 2023-04-25 | 成都先进金属材料产业技术研究院股份有限公司 | High-strength and high-toughness seamless steel pipe and preparation method thereof |
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| CN101892432A (en) * | 2010-07-09 | 2010-11-24 | 天津钢管集团股份有限公司 | Manufacturing method of X70QS seamless line pipe for acid environment |
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| JPH0250916A (en) * | 1988-08-11 | 1990-02-20 | Nippon Steel Corp | Production of low alloy high tension seamless steel pipe having fine grained structure |
| JP3965708B2 (en) * | 1996-04-19 | 2007-08-29 | 住友金属工業株式会社 | Manufacturing method of high strength seamless steel pipe with excellent toughness |
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