CN101864542B - Steel for high-frequency resistance straight weld oil well pipe and production method thereof - Google Patents
Steel for high-frequency resistance straight weld oil well pipe and production method thereof Download PDFInfo
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Abstract
The present invention relates to a steel for a high-strength oil well pipe and a production method thereof, in particular to a steel for a high-frequency resistance straight weld oil well pipe and a production method thereof, solving the technical problems that the steel for an ERW (Electrical Resistance Weld) oil well pipe in the prior art cannot meet the steel for N80 grade non-quenched ERW welding non-quenched oil well pipes due to extremely-low strength and toughness, higher yield, no favorable matching of the strength and the plasticity. The present invention designs the steel for the high-frequency resistance straight weld oil well pipe. The steel is characterized by comprising the following chemical components in percentage by weight: 0.05-0.13 percent of C, 0.10-0.40 percent of Si, 1.0-1.8 percent of Mn, 0.1-0.5 percent of Cr, 0.1-0.5 percent of Mo, 0.02-0.06 percent of Nb, 0.02-0.06 percent of Ti, not more than 0.025 percent of P, not more than 0.020 percent of S and the balance of Fe and inevitable doped elements. The invention can be used for producing oil casings and oil pipes.
Description
Technical field:
The present invention relates to high-strength oil well tube steel and manufacture method thereof, particularly steel for high-frequency resistance straight weld oil well pipe and manufacture method thereof refer to N80 level ERW soldering not quenching and tempering oil well tube steel, can be used for making petroleum casing pipe and oil pipe.
Background technology:
Traditional high strength grade petroleum casing pipe is based on weldless steel tube, and needs modifier treatment, complex manufacturing, and cost is higher.Weldless steel tube also exists a series of problems such as mechanical property is relatively poor, steel pipe is eccentric, deviation from circular from is big, inhomogeneity of wall thickness is even, the inside pipe wall quality is not good.
High-frequency resistance straight weld oil well pipe (being called for short ERW soldering oil well casing) is a nonpetroleum tubing of developing a kind of alternative seamless tubular goods of also progressively growing up the external latter stage seventies.Because weld seam and mother metal fully can be by improving welding quality, improve thermal treatment process and realize equal strength, etc. the toughness coupling, so ERW soldering oil well casing not only can be done petroleum casing pipe, and can make oil pipe.The high frequency resistance welding oil well pipe is compared with jointless oil well tube, has advantages such as dimensional precision height, good, the anti-extrusion performance height of welding seam toughness, cost are low, has obtained using widely, has obtained good benefit.Present low strength rank ERW soldering oil well casing manufacturing technology comparative maturity.But the manufacturing aspect that is used to exploit the N80 level high-performance grade of steel ERW welding steel for oil well pipes of deep layer oil well still is in the starting stage, particularly can be used in the manufacturing technology of making N80 level high-performance grade of steel ERW soldering not quenching and tempering pipe for oil well use hot-rolled steel sheet and has difficulties.
The manufacturing of N80 level high-performance grade of steel ERW oil well pipe has two kinds of technologies: a kind of is to adopt welding back hardening and tempering method, promptly adopt the lower hot-rolled steel sheet of strength grade, pipe is made in the ERW welding, carries out homogeneous tube modifier treatment (quenching+high tempering) mechanical property of oil well pipe is brought up to the N80 stratification levels.The original structure of this method steel plate is ferrite+pearlitic structure, after the modifier treatment, steel plate be organized as the tempered sorbite tissue.In order to reach high-intensity performance after modified, product design is added a certain amount of V element based on the C-Mn reinforcement, plays the effect of precipitation strength behind the high tempering.The defective of this method is that the homogeneous tube modifier treatment need increase the technology cost, the while heat treated equipment of homogeneous tube (process furnace and quenching apparatus) complexity, be difficult to guarantee that the even cooling of homogeneous tube surfaces externally and internally meets the modifier treatment processing requirement, in addition, in order after modified, to reach high-intensity performance, need higher C content, the impelling strength of body is lower like this.Patent CN200510038472.7 " high anti-extrusion petroleum casing pipe and production method thereof ", promptly adopt this method, [C] content is higher in the steel, reaches 0.34-0.39%, this sleeve pipe need adopt the thermal treatment process of modified (quenching adds tempering), quenching temperature is 860 ℃ ± 10 ℃, and tempering temperature is more than 500 ℃, after the sleeve pipe thermal treatment, also need carry out straightening processing, straightening temperature need be controlled between 450 ℃～480 ℃, and production technique is complicated, and cost is higher.Another method is to adopt non-modified processing method, and promptly plate property just reaches the N80 performance requriements, behind the ERW welding tube-making only butt welded seam carry out normalizing treatment, oil well pipe just can satisfy the requirement of N80.This need design the hot-rolled steel sheet that meets the N80 performance requriements.The composition of existing microalloy hot-rolled steel sheet and Technology are added alloying elements such as micro-Nb, V, Ti based on the C-Mn steel, obtain ferrite and add pearlitic structure, and intensity is difficult to reach the desired strength grade requirement of N80 rank.In order to improve intensity, middle carbon microalloy pearlitic steel generally takes to improve the method for C content in the steel, but when the C content in the steel was higher, material welding performance worsened, and is not suitable for the ERW welding process requirement, and welding back weld seam impact toughness is poor.A kind of straight joint resistance welding oil annular tube steel and manufacture method thereof that Chinese patent 101139682A provides, there is following deficiency: 1) adopt the Cu element to strengthen, the Cu element can cause serious Cu embrittlement line in the hot-rolled steel sheet when slab heats, in order to eliminate Cu embrittlement, must add the Ni element more than 0.2%, and Ni belongs to noble metal, and this has significantly increased the cost of product.2) Cu, Ni element are strengthened mainly based on precipitation strength and solution strengthening, and the product yield tensile ratio that obtains is higher.This is unfavorable for the tubulation processing of steel plate.Particularly when the sleeve pipe of processing some little calibers and oil pipe, because caliber is little, the work hardening during tubulation is serious, and is higher as the yield tensile ratio of fruit product itself, and then the yield tensile ratio behind the tubulation will be higher, influences the use of tubing.3) product has added the B element, because the B element easily in the segregation of crystal boundary place, is unfavorable for the welding property of product, so be unsuitable for making the petroleum casing pipe that needs the ERW welding.4) carbon content of this Patent right requirement 4 is 0.14-0.2%, existing the steel welding property be studies show that, when the steel carbon content greater than 0.14% the time, can seriously undermine material welding performance, postwelding heat affected zone and weld seam ballistic work are low, and welding the time needs thermal pretreatment, and postwelding needs slow cooling.This can't realize on existing ERW welding tube-making production line, and can increase manufacturing procedure.
Therefore, prior art be difficult to satisfy N80 level ERW soldering not quenching and tempering oil well tube steel with steel to excellent comprehensive performance requirements such as high strength, low yield strength ratio, high tenacity, good welds performance, high performance-price ratios.
Summary of the invention:
In order to overcome the deficiencies in the prior art, need provide a kind of and can satisfy N80 level ERW soldering not quenching and tempering steel for oil well pipes and manufacture method thereof, the present invention adopts low-carbon microalloyed treatment technology, the main phase transformation strengthening mechanism that relies on, utilize inclusion morphology control techniques and controlled rolling controlled cooling technology to produce, thereby when guaranteeing that material has higher-strength, have excellent comprehensive performances such as low yield strength ratio, high tenacity, good welds performance, high performance-price ratio.
The purpose of this invention is to provide a kind of yield strength greater than 555MPa, tensile strength N80 level ERW oil well tube steel and production method thereof greater than 690MPa.It is on the low side to solve prior art ERW oil well tube steel intensity and toughness, and yield tensile ratio is higher, and intensity and plasticity can not matched well, can not satisfy the technical problem of the non-modified ERW soldering not quenching and tempering steel for oil well pipes of N80 rank.The composition of material of the present invention adopts low-carbon (LC), high manganese as strengthening element, add the transformation temperature of Mo, Cr reduction material, increase the hardening capacity of material, the main phase transformation strengthening mechanism that relies on, adopt niobium, titanium micro-alloyed element crystal grain thinning simultaneously, adopt inclusion morphology control techniques and controlled rolling controlled cooling technology to produce.By controlling to rolling postcooling speed, make material obtain granular ferrite and add lower bainite tissue or acicular ferrite structure, thereby make this material except that having high strength, also have lower yield tensile ratio, good low-temperature impact toughness and good welding, moulding, processing characteristics, satisfy of the requirement of N80 level ERW soldering not quenching and tempering petroleum casing pipe high strength and excellent comprehensive performance.
For achieving the above object, the present invention has designed a kind of steel for high-frequency resistance straight weld oil well pipe, it is characterized in that chemical ingredients (weight percentage) is, C:0.05～0.13%, Si:0.10～0.40%, Mn:1.0～1.8%, Cr:0.1～0.5%, Mo:0.1～0.5%, Nb:0.02～0.06%, Ti:0.02～0.06%, P≤0.025%, S≤0.020%, surplus are Fe and inevitable tramp element.
The effect of each element is as follows in the steel for high-frequency resistance straight weld oil well pipe of the present invention:
[carbon]: improve C content, favourable to the room temperature strength and the medium temperature intensity that improve steel, but all unfavorable to plasticity, toughness, formability, the weldability of steel, so the control of C content is unsuitable too high.
[manganese]: improve Mn content in the steel, can enlarge the γ district, reduce γ → α transition temperature, enlarge the rolling technology scope, but Mn content height, the cost of the corresponding increase steel of meeting also can increase carbon equivalent, is unfavorable for welding.
[silicon]: Si also plays part solution strengthening effect, but too high Si content is unfavorable to the formability, weldability, toughness and the plasticity that improve steel.
[molybdenum]: Mo can postpone ferrite effectively and not influence bainitic transformation, and Mo and Mn unite to use to also help and obtain compact grained needle-like iron element or compact grained granular bainite.Mo can also suppress pearlitic formation, thereby can effectively improve the toughness of material.Mo improves the effect of anti-intensity greater than yield strength, therefore can effectively reduce yield tensile ratio.But the Mo constituent content is too high, can form upper bainite, weakens impelling strength.
[chromium]: Cr enlarges the γ district, helps obtaining acicular ferrite or granular bainite, enlarges the hot rolling technology window.Cr helps reducing yield tensile ratio equally.Cr content height can reduce impelling strength equally.
[sulphur, phosphorus]: sulphur forms sulfide inclusion in steel, and its ductility and toughness are reduced.During steel rolling,, the anisotropy of steel is increased the weight of, cause the steel plate layering when serious because MnS is mingled with along with rolling direction is extended.The sulphur content height is also unfavorable to the welding of steel simultaneously.The sulphur content height also reduces the corrosion resistance of steel.The high cold shortness that increases steel of phosphorus rises the brittle transition temperature of steel, and the impelling strength of steel is significantly descended, so the content of phosphorus in oil casing pipe steel is also fewer better.
[titanium]: add trace amount of titanium in the steel, not only help the deoxidation of steel, and, can play recrystallize that postpones austenite crystal and the tendency of growing up, thereby improve performance, the especially impelling strength of steel owing to the nitride of titanium in the steel or the existence of carbide.Ti can also effectively improve welding property.Crystal grain was too grown up when TiN can effectively prevent the slab heating.
[niobium]: in steel, form nitride or carbide, help the crystal grain thinning tissue, the effect of performance precipitation strength.Be solid-solubilized in the formation that Nb in the austenite can promote acicular ferrite.
The invention provides the hot rolling technology of above-mentioned N80 level ERW soldering not quenching and tempering oil casing pipe steel.The continuous casting steel billet that mentioned component is required is heated to 1180 ℃～1230 ℃, and hot rolling is divided into the two-part rolling technology, and roughing is that recrystallization temperature is above rolling, and finish rolling is rolling in non-recrystallization temperature interval.Rough rolling step is 5 passage tandem rollings, and the roughing end temp is 1010～1060 ℃.Finish rolling is 7 passage tandem rollings, and the finish rolling start rolling temperature is 900 ℃～950 ℃, and the finish rolling end temp is 820 ℃～880 ℃.Finish rolling stage compression ratio is greater than 75%, and after the finish rolling, the steel plate finished product thickness is 3～12mm, and the laminar flow cooling stages adopts leading portion cold by force, and speed of cooling is 15～30 ℃/S.Coiling temperature is 500 ℃～600 ℃.
The effect of the hot rolling technology system that the present invention takes is as follows:
Slab heating temperature: slab heating temperature is set at the dissolving of guaranteeing the Nb element, and slab heating temperature too high meeting causing slab austenite crystal is grown up unusually.
The following temperature of recrystallize rolling: stop the density that continuous rolling below the temperature can increase ferrite nucleation site in the austenite by recrystallize, thereby the grain-size of abundant refinement ferrite, bainite, acicular ferrite, this toughness for the effect of bringing into play refined crystalline strengthening and raising material is very crucial.
Finishing temperature: take equally effectively thinning microstructure of lower finishing temperature, improve the toughness of product.Because under the low temperature, rate of diffusion is slow, therefore the low finishing temperature compound that can also suppress Nb is separated out, and increases the result that the reservation amount of Nb in sosoloid all can obtain low transition temperature and increase precipitation strength in the ferrite.
Coiling temperature: lower coiling temperature means and rolls fast speed of cooling of back, is to obtain to have the bainite of high dislocation density, the important assurance of acicular ferrite in the quick cooling more than 500 ℃.Suitable in addition coiling temperature is to guarantee Nb (C, N) factor of separating out in 600 to 500 ℃ of temperature ranges.
The invention has the beneficial effects as follows,, obtain a kind of high intensity levels ERW soldering not quenching and tempering oil well tube steel, can be used for making petroleum casing pipe and oil pipe with good over-all properties by reasonable component design and hot rolling technology system design.The advantage of its composition design is by the adjusting of C content and adds Mo, Cr element, obtain acicular ferrite structure or ferrite+lower bainite tissue, microstructure is a heterogeneous structure, can effectively reduce the yield tensile ratio of material, both guaranteed high-intensity requirement by phase transformation strengthening, guaranteed again that material had than low yield strength ratio and high impelling strength.The characteristics of its rolling technology are by the rolling temperature of controlling non-recrystallization zone and deflection, and thinning microstructure guarantees impelling strength.Guarantee to obtain the effect of suitable tissue and performance precipitation strength by control finish rolling end temp and rolling postcooling speed.The performance requriements of the high intensity levels ERW soldering not quenching and tempering oil well tube steel that obtains satisfies the requirement of API 5CT standard to the oil well pipe comprehensively.
The regulation total elongation intensity R of the high intensity levels ERW soldering not quenching and tempering oil well tube steel that the present invention obtains
T0.5〉=555MPa, tensile strength Rm 〉=690MPa, yield tensile ratio≤0.83, elongation after fracture 〉=28%, the horizontal 0 ℃ of Charpy-V impact power 〉=120J of steel plate.Microstructure is a heterogeneous structure, is specially granular ferrite+acicular ferrite or granular ferrite+granular bainite, grain size number 〉=11 grade.
Description of drawings:
Fig. 1 and Fig. 2 are the metallographic microstructure photo of high-performance oil well tube steel
Embodiment:
The present invention will be further described below in conjunction with embodiment 1-4.
Table 2 set of dispense ratio of the present invention, the component % that is weight percentage, surplus is Fe.
| Element | C％ | Si％ | Mn％ | Cr％ | Mo％ | Nb％ | Ti％ | P％ | S％ |
| Design | 0.05 -0.13 | 0.1-0.4 | 1.0 -1.8 | 0.1 -0.5 | 0.1 -0.5 | 0.02 -0.06 | 0.010 -0.040 | ≤0.025 | ≤0.020 |
| Embodiment one | 0.05 | 0.2 | 1.5 | 0.2 | 0.2 | 0.06 | 0.02 | 0.012 | 0.010 |
| Embodiment two | 0.07 | 0.4 | 1.8 | 0.4 | 0.3 | 0.05 | 0.02 | 0.012 | 0.010 |
| Embodiment three | 0.10 | 0.2 | 1.3 | 0.1 | 0.5 | 0.05 | 0.02 | 0.012 | 0.010 |
| Embodiment four | 0.13 | 0.1 | 1.2 | 0.2 | 0.1 | 0.02 | 0.04 | 0.012 | 0.010 |
According to material composition designing requirement of the present invention; adopt molten iron pre-desulfurization; the converter top bottom blowing; blow Ar station (or LF stove) and guarantee bottom blowing Ar churning time greater than 5 minutes, the RH stove carries out trimming, vacuum circulation degassing is handled, and guarantees that the pure degassing time of RH was greater than 8 minutes; feed an amount of iron-calcium line simultaneously; continuous casting adopts low-carbon steel protecting slag, and whole process is blown Ar protection casting, is cast into continuous casting steel billet.Continuous casting steel billet is behind the process furnace reheat, rolling on the Continuous Heat tandem rolling mill, technology controlling and process sees the following form 3, by roughing milling train and finish rolling tandem rolling unit after recrystallization zone and the controlled rolling of non-recrystallization district, carry out controlled chilling, batch then, produce qualified hot-rolled sheet coil, product thickness is 3-12mm.
Table 3 hot rolling technology controlled variable of the present invention
| The hot rolling parameter | Slab heating temperature/℃ | The roughing end temp/℃ | Finish rolling begin temperature/℃ | The finish rolling end temp/℃ | Finish rolling compression ratio/% | Coiling temperature/℃ |
| Set | 1180-1230 | 1010-1060 | 900-950 | 820-880 | ≥75 | 500-600 |
| Embodiment one | 1230 | 1060 | 900 | 820 | 80 | 500 |
| Embodiment two | 1220 | 1030 | 920 | 850 | 85 | 520 |
| Embodiment three | 1200 | 1040 | 950 | 880 | 82 | 580 |
| Embodiment four | 1180 | 1010 | 930 | 820 | 75 | 600 |
The effective hot-rolled steel sheet of N80 level ERW soldering not quenching and tempering oil well that utilizes aforesaid method to obtain.With reference to accompanying drawing, microstructure is a heterogeneous structure, is specially granular ferrite+acicular ferrite (Fig. 1) or granular ferrite+granular bainite (Fig. 2).Grain size number is 11～13 grades.Except that having high strength, also have lower yield tensile ratio, good low-temperature impact toughness and good welding, moulding, processing characteristics.Regulation total elongation intensity R
T0.5〉=555MPa, tensile strength Rm 〉=690MPa, yield tensile ratio≤0.83, elongation after fracture 〉=28%, the horizontal 0 ℃ of Charpy-V impact power 〉=120J of steel plate.Sampling detects mechanical property and sees Table 4:
The mechanical property of table 4 minute coiled sheet sampling
| Performance index | ?R t0.5/MPa | Rm/MPa | Yield tensile ratio R t0.5/Rm | Elongation after fracture A/% | 0℃ Akv/J | 180 ° of pliability test d=3a |
| Embodiment one | 560 | 700 | 0.80 | 33 | 240 | Intact |
| Embodiment two | 570 | 720 | 0.79 | 32 | 210 | Intact |
| Embodiment three | 600 | 740 | 0.81 | 31 | 150 | Intact |
| Embodiment four | 620 | 750 | 0.83 | 28 | 120 | Intact |
Claims (2)
1. steel for high-frequency resistance straight weld oil well pipe, it is characterized in that chemical component weight percentage ratio is, C:0.05～0.13%, Si:0.10～0.40%, Mn:1.0～1.8%, Cr:0.1～0.5%, Mo:0.1～0.5%, Nb:0.02～0.06%, Ti:0.02～0.06%, P≤0.025%, S≤0.020%, surplus is Fe and inevitable tramp element; Make according to the following steps: the continuous casting steel billet that composition is required is heated to 1180 ℃～1230 ℃, and hot rolling is divided into the two-part rolling technology, and roughing is that recrystallization temperature is above rolling, and finish rolling is rolling in non-recrystallization temperature interval; Rough rolling step is 5 passage tandem rollings, and the roughing end temp is 1010～1060 ℃; Finish rolling is 7 passage tandem rollings, and the finish rolling start rolling temperature is 900 ℃～950 ℃, and the finish rolling end temp is 820 ℃～880 ℃; Finish rolling stage compression ratio is greater than 75%, and the laminar flow cooling stages adopts leading portion cold by force, and speed of cooling is 15～30 ℃/s, and coiling temperature is 500 ℃～600 ℃.
2. steel for high-frequency resistance straight weld oil well pipe according to claim 1, it is characterized in that finish rolling after, the steel plate finished product thickness is 3～12mm.
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