CN101413088A - Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof - Google Patents
Sulfurated hydrogen stress etching-resisting petroleum casing pipe and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a petroleum casing pipe with sulfurated hydrogen stress corrosion resistance and a producing method thereof, which aims to proceed from improvement on purity and tensile ratio of steel, tempered martensite proportion, grain refinement, remained stress reduction and other aspects, and provide the petroleum casing pipe with high obdurability and sulfurated hydrogen stress corrosion resistance and the production method thereof. The petroleum casing pipe comprises the following compositions in weight percentage: 0.12 to 0.18 percent of C, 0.10 to 0.60 percent of Si, 0.05 to 1.0 percent of Mn, 0.20 to 1.0 percent of Cr, 0.10 to 0.80 percent of Mo, 0.005 to 0.05 percent of Al, 0.005 to 0.02 percent of Ti, 0.05 to 0.15 percent of V, 0.002 to 0.02 percent of Nb, 0.0003 to 0.005 percent of Ca, 0.0003 to 0.005 percent of Mg, 0.0003 to 0.003 percent of B, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of N, and the balance being Fe, wherein the weight percentages of carbon, manganese, chromium and molybdenum are determined by a comprehensive control formula, that is A is equal to the sum of percentage of C, percentage of Mn divided by 5, percentage of Cr divided by 5, and percentage of Mo divided by 3, and the range of A is between 0.45 and 0.60 percent.
Description
Technical field
The invention belongs to the weldless steel tube manufacturing technology field of metallurgical industry, particularly a kind of petroleum casing pipe of sulfurated hydrogen stress etching-resisting and manufacture method thereof.
Background technology
The Sichuan of China, long celebrating, North China and Xinjiang, and all contain hydrogen sulfide in the hydrocarbon zone in oil fields such as the Barrow horse of the U.S., your gulf of Canadian truncation, according to statistics, the oil-gas field in the world nearly 1/3 contains hydrogen sulfide.When the common petroleum sleeve pipe was applied to contain the hydrocarbon resources exploitation of hydrogen sulfide, petroleum casing pipe tended to during far below its yield strength, brittle rupture take place suddenly stressed under the acting in conjunction of service stress and hydrogen sulfide.The lighter causes string of casing or whole well to scrap, and weight person can make hydrogen sulfide and oil gas together leak, and forms blowout, brings great threat for the safety in production of oil-gas field.
From now on, along with the increasing of the oilfield drilling degree of depth, the residing environment for use of petroleum casing pipe will be more abominable.Therefore, oil-gas field enterprise is to the demands for higher performance of petroleum casing pipe.For this reason, exploit the high-quality petroleum casing pipe that the hydrocarbon resources that contains hydrogen sulfide just must adopt the sulfurated hydrogen stress etching-resisting with high-strong toughness now.
The petroleum casing pipe of hydrogen sulfide corrosion-resistant requires steel to have good intensity and toughness and hydrogen sulfide corrosion-resistant performance, but the toughness of material and hydrogen sulfide corrosion-resistant performance are influenced by the carbide morphology in the steel.In order to reduce the carbide on the metal lattice, need to reduce the carbon content of steel alloy, but this can reduce mechanical propertys such as the hardening capacity of material and yield strength, for this reason, adopt at present extensively the method that increases manganese (Mn), chromium (Cr) and molybdenum (Mo) content with mechanical propertys such as the hardening capacity of raising material and yield strengths, improve the performance of hydrogen sulfide corrosion-resistant petroleum casing pipe.But because various alloying element independent control make the interpolation of alloying element excessive easily, cause equivalent carbon content too much, reduce the plasticity and the toughness of petroleum casing pipe on the contrary, reduced the sulfurated hydrogen stress etching-resisting ability of steel.
In addition, in the high strength petroleum sleeve pipe, the density of lattice displacement increases, and protium is easy to be stored in lattice displacement place, and then protium easily accumulates in the stress concentration position.For this reason, need reasonably rolling and thermal treatment process condition, reduce unrelieved stress, improve the yield tensile ratio of material.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, set about from aspects such as the purity that improves steel and yield tensile ratio and tempered martensite ratio, crystal grain thinning, reduction unrelieved stresss, a kind of needs that can satisfy the dark hydrocarbon zone exploitation of H 2 S-containing gas are provided, have the petroleum casing pipe and the manufacture method thereof of high-strong toughness and sulfurated hydrogen stress etching-resisting ability.
The present invention is achieved through the following technical solutions:
A kind of petroleum casing pipe of sulfurated hydrogen stress etching-resisting, it is characterized in that, form by following compositions by weight percentage: C:0.12～0.18%, Si:0.10～0.60%, Mn:0.05～1.0%, Cr:0.20～1.0%, Mo:0.10～0.80%, Al:0.005～0.05%, Ti:0.005～0.02%, V:0.05～0.15%, Nb:0.002～0.02%, Ca:0.0003～0.005%, Mg:0.0003～0.005%, B:0.0003～0.003%, P≤0.020%, S≤0.005%, N≤0.005%, the Fe of surplus, carbon wherein, manganese, chromium, the weight percent of molybdenum is determined by Comprehensive Control formula A=C%+ (Mn%/5)+(Cr%/5)+(Mo%/3), A is a carbon in the formula, manganese, chromium, the comprehensive content of molybdenum, the scope of A is 0.45-0.60%, carbon, manganese, chromium, the content of molybdenum is both in the scope of comprehensive content, again in content range separately.
Acting as of main alloy element:
C: carbon is carbide forming element, can improve the intensity and the hardness of steel.When carbon content is lower than 0.1%,, just must carry out temper at low temperature for obtaining desirable intensity.This low-temperaturetempering is handled and is caused the ability of sulfurated hydrogen stress etching-resisting low.Surpass 0.2% and work as carbon content, yield ratio reduces, and obtain desirable yield strength, along with the increase of carbon content, causes hardness to rise and the reduction of sulfurated hydrogen stress etching-resisting ability.In order to obtain the balance of hardness and sulfurated hydrogen stress etching-resisting ability, the carbon content scope is controlled between 0.12～0.18%.
Si: silicon has reductive action, also can be used for improving the hardening capacity of steel and improves intensity.When silicone content was lower than 0.05%, action effect was not obvious, but silicone content surpasses at 1.0% o'clock, and the sulfurated hydrogen stress etching-resisting performance just reduces.Therefore, the content range of silicon is controlled between 0.1～0.6%.
Mn: manganese is austenite former, can improve the hardening capacity and the intensity of steel, increases the remained austenite content in the steel, influences the homogeneity of hot rolling microstructure.Generally need the amount 0.05% or more, but manganese content is in case surpass more than 1.0%, the ability of sulfurated hydrogen stress etching-resisting is reduction just.Therefore, the content of manganese generally is controlled in 0.05～1.00% scope.
Cr: chromium can improve mechanical property, the erosion resistance of steel and improve hardening capacity, and the content that makes its performance effect is more than 0.05%, but chromium content surpasses 1.5%, and the sulfurated hydrogen stress etching-resisting ability of steel reduces.Therefore, the content of chromium generally is controlled in 0.20～1.00% the scope.
Mo: molybdenum has hardening capacity that improves steel and the high strength of guaranteeing steel, can improve the sulfurated hydrogen stress etching-resisting performance of steel simultaneously.The content that makes molybdenum performance effect is more than 0.05%, but the content of molybdenum surpasses 1.0%, just forms thick carbide at austenite grain boundary, reduces the ability of sulfurated hydrogen stress etching-resisting.Therefore, the content of molybdenum generally is controlled in 0.10～0.80% the scope.
Al: aluminium has reductive action, can improve the toughness and the processibility of steel.When the content of aluminium surpassed 0.10%, the probability that the metallic surface produces defective increased.Therefore, the content of aluminium generally is controlled in 0.005～0.05% the scope.
Ti: titanium combines with nitrogen in the steel as nitride, and the boron solid solution condition is existed, and has the effect that improves the quenching performance.For obtaining this effect of titanium, need the content of titanium to reach more than 0.002%.But the content of titanium surpasses at 0.05% o'clock, just exists as thick nitride, reduces anti-sulphide stress corrosion performance.Therefore, the content of titanium is controlled in 0.005～0.02% scope.
V: vanadium can crystal grain thinning when temper, forms carbide, improves the intensity and the toughness of steel.When the content of vanadium surpasses 0.03%, just can play one's part to the full; But when the content of vanadium surpassed 0.20%, toughness just reduced.Therefore, the content of vanadium is controlled in 0.05～0.15% scope.
Nb: niobium forms carboritride at high temperature, prevents thickization of crystalline, improves the sulfurated hydrogen stress etching-resisting performance.When the content of niobium surpasses 0.002%, just can play a role, but the content of niobium surpasses at 0.04% o'clock, carboritride is just too thick, reduces the sulfurated hydrogen stress etching-resisting performance on the contrary.Therefore, the content of niobium is controlled in 0.002～0.020% scope.
Ca: calcium forms sulfide with the reaction of Salmon-Saxl in the steel, improves the form of element sulphur, improves the sulfurated hydrogen stress etching-resisting ability of steel.When calcium contents surpasses 0.0003%, just can play a role, but calcium contents surpasses at 0.005% o'clock, Jie in the steel increases at thing content, and the purity of steel reduces, and reduces the sulfurated hydrogen stress etching-resisting performance on the contrary.Therefore, the content of calcium is controlled in 0.0003～0.005% scope.
Mg: magnesium forms sulfide with the reaction of Salmon-Saxl in the steel, improves the form of element sulphur, improves the sulfurated hydrogen stress etching-resisting ability of steel.When Mg content surpasses 0.0003%, just can play a role, but Mg content surpasses at 0.005% o'clock, Jie in the steel increases at thing content, and the purity of steel reduces, and reduces the sulfurated hydrogen stress etching-resisting performance on the contrary.Therefore, the content of magnesium is controlled in 0.0003～0.005% scope.
B: the contents level that boron has impurity just can improve the hardening capacity of steel, for obtaining unusual effect, need the content of boron to surpass more than 0.0003%, but the content of boron surpasses at 0.005% o'clock, and the toughness of steel just reduces.For this reason, the content of boron is controlled in 0.0003～0.003% scope.
P: phosphorus is the impurity in the steel, and it can cause the crystal grain segregation to bring toughness to reduce, and especially content surpasses 0.025%, and the sulfurated hydrogen stress etching-resisting performance sharply descends.Therefore, the content of phosphorus is controlled at below 0.020%.
S: sulphur is the impurity in the steel, and its content surpasses 0.010%, significantly reduces the sulfurated hydrogen stress etching-resisting performance.Therefore, the content of sulphur is controlled at below 0.005%.
N: elements such as the same aluminium of nitrogen, titanium, niobium are in conjunction with forming nitride.Nitrogen content is too high, and the crystal grain that not only causes aluminium nitride and titanium nitride is thick, and forms nitride with boron, significantly reduces hardening capacity.Therefore, nitrogen content is controlled at below 0.005%.
In order to have high-strong toughness and sulfurated hydrogen stress etching-resisting ability, the manufacture method of petroleum casing pipe of the present invention, its rolling technology is that the finishing temperature that 1100～1050 ℃ of pipes add hot piercing, tandem rolling is not less than 950 ℃, the finishing temperature of deciding reducing and rolling is not less than 900 ℃, be characterised in that: finish the hollow forging of deciding reducing and rolling and be cooled on the cold bed below the Ar3 critical temperature, adopt quenching+tempered thermal treatment process then, quenchant is the water-based hardening liquid, quenching temperature is 950 ℃ ± 10 ℃, tempering temperature adopts air cooling at 670～710 ℃.After the petroleum casing pipe thermal treatment, handle through secondary hot size and hot straightening, secondary hot size temperature is between 550～600 ℃, and the hot straightening temperature is between 500 ℃～540 ℃.
Concrete steps are as follows:
(1) batching is smelted
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with the eccentric stove of electric arc (EFA), through external refining (LF) and vacuum (VD) degas method, the content of impurity in the control steel, improve the purity of steel, the weight item that obtains petroleum casing pipe is: C:0.12～0.18%, Si:0.10～0.60%, Mn:0.05～1.0%, Cr:0.20～1.0%, Mo:0.10～0.80%, Al:0.005～0.05%, Ti:0.005～0.02%, V:0.05～0.15%, Nb:0.002～0.02%, Ca:0.0003～0.005%, Mg:0.0003～0.005%, B:0.0003～0.003%, P≤0.020%, S≤0.005%, N≤0.005%, surplus are iron.
(2) continuous casting and rolling
Above-mentioned high purity steel water continuous casting becomes the circle base, with the cooled continuously cast bloom rotary heating furnace internal heating of packing into, the heating of pipe blank temperature is 1160～1210 ℃, 1110～1150 ℃ of heat centering temperature, 1050～1110 ℃ of hot piercing temperature, the finishing temperature of tandem rolling is not less than 950 ℃, and the finishing temperature of deciding tube reducing is not less than 900 ℃, cooling, sawing.
Introduce the effect of each manufacturing process below respectively:
Ring furnace:
The heating of pipe blank temperature: 1160～1210 ℃, allow the temperature difference: ± 5 ℃, tapping temperature reaches 1160 ℃.
In order to improve temperature control precision, rotary heating furnace is divided into 7 control regions along the circumferential direction, preheating section accounts for a control region, and heating zone accounts for four control regions, and soaking zone accounts for a control region, discharging section accounts for a control region, wherein, the temperature of preheating section is 540 ± 20 ℃, and the temperature of heating zone is 1210 ± 5 ℃, the soaking zone temperature is 1210 ± 5 ℃, and the heating curve of steel pipe is a progressive para-curve of 1160 ℃.
Centering and piercing process:
Adopt heat centering and Mannesmann's method perforation, reduce the perforated shear strain of steel alloy, prevent defectives such as the surface of hollow billet cracks, folding, absciss layer, guarantee the geometrical dimension and the form accuracy of hollow billet, 1110～1150 ℃ of heat centering temperature, piercing temperature is 1050～1110 ℃.
Continuous rolling process:
The purpose of continuous rolling process is that perforation process is transferred the hollow billet that comes to be carried out tube reducing, extend and the corresponding wall that subtracts, and improves the rough degree of hollow forging surfaces externally and internally simultaneously, improves evenness of wall thickness.Tandem rolling adopts retained mandrel rolling, the draught of each roll of control continuous mill, the precision of assurance pipe.
When the temperature of tandem rolling was lower than 800 ℃, the resistance to deformation of hollow billet was excessive, produced instrument abrasion problem.On the other hand, when the temperature of tandem rolling was higher than 1100 ℃, metal grain was too thick, and the sulfurated hydrogen stress etching-resisting performance reduces.Therefore, rolling temperature is controlled between 950～1100 ℃.
Fixed reducing process:
Decide the process that the tube reducing process is a hollow body tandem rolling, except playing sizing, general also requirement has bigger reducing rate, and general total reducing rate is controlled in 10～25% scopes.The frame number that three rollers are decided the tube reducing milling train is 24, and finishing temperature is controlled at and is not less than 900 ℃.
The cold bed cooling:
In the back of deciding the reducing and rolling unit cold bed is set, makes the hollow forging of deciding behind the reducing and rolling enter cold bed, be chilled to following 10 ℃～40 ℃ of Ar3 critical temperature, crystal grain thinning is directly sent into heat treated reheating furnace then, by online thermal treatment save energy.
(3) pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 950 ℃ ± 10 ℃, and quenchant is the water-based hardening liquid, and tempering temperature adopts air cooling at 670～710 ℃.After the hollow forging thermal treatment, need through row secondary sizing and straightening processing, the sizing mill temperature is between 550～600 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～540 ℃ at last.
Quenching technology:
Deciding hollow forging behind the reducing and rolling directly enters and is arranged on the cold bed of deciding tube reducing milling train back, be chilled to below the Ar3 critical temperature 10 ℃～40 ℃ in the cold bed windward, packing into after the sawing is located at the reheating furnace of cold bed back, is heated to the temperature range of Ac3 stagnation point～1000 ℃.When Heating temperature is lower than the Ac3 critical point temperature, will generate ferric oxide, can not get uniform quenching structure; And when Heating temperature surpasses 1000 ℃, will promote grain growing, thick crystal grain causes the sulfurated hydrogen stress etching-resisting degradation.The purpose of this heating is exactly the temperature contrast of eliminating on the steel pipe length direction, the homogenizing tissue.
Determine that the hollow forging Heating temperature is 950 ℃ ± 10 ℃, be incubated 10 minutes, fully form austenite, quenchant adopts the water-based hardening liquid, to guarantee 20 ℃/second speed of cooling, obtains sufficient martensitic stucture.
Tempering process:
Tempering is carried out being lower than the Ac1 critical temperature, fully to obtain tempered martensite, makes steel pipe have high yield ratio, improves the high sulfurated hydrogen stress etching-resisting performance of weldless steel tube.
Tempering temperature is controlled between 670 ℃～710 ℃, and the tempered time is relevant with the wall thickness of steel pipe, uses 20～60 minutes approximately.
The secondary fixed diameter process:
Select rational sizing parameter, the diameter distortion rate of secondary sizing reaches 3%～5%, makes the surface of petroleum casing pipe produce certain residual compressive stress, improves the mechanical property of petroleum casing pipe, improves the size and the circularity precision of petroleum casing pipe.
Secondary sizing temperature is controlled in 550～600 ℃ of scopes.
Hot straightening technology:
Select best aligning coefficient of draught, reduce to align the unrelieved stress that processing produces, improve the circularity and the linearity of petroleum casing pipe, improve the performance of petroleum casing pipe.This aligning coefficient of draught generally is 0.64～0.77 times weldless steel tube elastic limit distortion.
The hot straightening temperature is between 500 ℃～540 ℃.
That adopts that method of the present invention produces has a high-strong toughness petroleum casing pipe, its yield strength: more than the 862MPa, and ultimate strength 〉=894MPa, yield ratio 〉=90%.
The index that the mechanical property of described petroleum casing pipe reaches is as follows:
Yield strength: 862～931MPa
Ultimate strength: 894.2～1012.0Mpa
Yield ratio: 92～96.4%
Sulfurated hydrogen stress etching-resisting threshold value with the measurement of NACE TM 0177-96A method: 90～95%SMYS
Unrelieved stress :≤150MPa
The geometrical dimension of petroleum casing pipe
The limit of error of diameter: 0.995%Dmm～1.01%Dmm
Out of roundness :≤1.1mm
Wall thickness :≤-8.0%t～8.0%t
Straight degree: pipe end≤1.5mm/m, body≤1.5 ‰
The present invention has following technique effect:
In the steel grade design of petroleum casing pipe of the present invention, the weight percent of carbon, manganese, chromium, molybdenum is determined by Comprehensive Control formula A=C%+ (Mn%/5)+(Cr%/5)+(Mo%/3), by the content of Comprehensive Control carbon, manganese, chromium and molybdenum, realize improving intensity, hardening capacity, hardness, plasticity and the toughness of petroleum casing pipe.Simultaneously, add titanium, vanadium, niobium alloy element, improved the quenching performance, the crystal grain thinning tissue.By the component content of optimization design steel alloy, improved the ability of petroleum casing pipe hydrogen sulfide corrosion-resistant.
The production method of petroleum casing pipe of the present invention, by the ultra-clean steel smelting technology, impurity and gas contents such as the sulphur in the reduction steel, phosphorus; Adopt rolling and method combined with heat treatment, refine austenite crystal grain; Adopt strict thermal treatment process, obtain uniform tissue and tempered martensite and yield tensile ratio, thereby obtained the steel alloy of sulfurated hydrogen stress etching-resisting superior performance.
Embodiment
Below in conjunction with specific embodiment to the detailed description of the invention.
Embodiment 1
Manufacturing dimension is that the detailed process of petroleum casing pipe of 244.5 * 11.99mm is as follows:
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with electric arc furnace, after external refining and vacuum outgas, the Chemical Composition that obtains molten steel is by weight percentage: C:0.15%, Si:0.15%, Mn:0.76%, Cr:0.35%, Mo:0.40%, Al:0.025%, Ti:0.016%, V:0.070%, Nb:0.005%, Ca:0.0018%, Mg:0.0015%, B:0.0013%, P:0.010%, S:0.002%, N:0.0034%, surplus is an iron.The A value is 0.5053%.
Above-mentioned high purity steel water continuous casting is become the circle base.With cooled continuously cast bloom at the rotary heating furnace internal heating, the heating of pipe blank temperature is 1190 ℃, heat centering temperature is 1120 ℃, adopt Mannesmann's method hot piercing, retained mandrel is rolling and reducing and rolling, the finishing temperature of tandem rolling is not less than 950 ℃, the final reducing and rolling temperature of deciding is controlled at 920 ℃, is in more than the Ar3 critical temperature.The hollow forging of deciding behind the reducing and rolling directly enters the cold bed of deciding reducing and rolling unit back, and is air-cooled to Ar3 critical temperature below 800～820 ℃, crystal grain thinning.Directly send into heat treated reheating furnace after the cooled hollow forging sawing, be heated to 950 ℃ of insulations 10 minutes, carry out quenching heat treatment, quenchant is the water-based hardening liquid, and speed of cooling is 20 ℃/second.680 ℃ of even heating 30 minutes, carry out temper.At 560 ℃ of secondary hot sizes, the diameter distortion rate of secondary sizing is controlled at about 3.8%.520 ℃ of hot straightenings, flaw detection at last obtains the finished product petroleum casing pipe.
The index that the telescopic mechanical property that obtains reaches is as follows:
Yield strength: 923Mpa
Ultimate strength: 997Mpa
Yield ratio: 92.6%
Sulfurated hydrogen stress etching-resisting threshold value with the measurement of NACE TM 0177-96A method: 91% SMYS
Unrelieved stress: 112.37MPa
The geometrical dimension of petroleum casing pipe
Diameter range: 245.64 (D+0.46%D) mm～246.19 (D+0.69%D) mm
Out of roundness :≤0.6mm
Wall thickness :≤-4.5%t～7.0%t
Straight degree: pipe end≤1.2mm/m, body≤1.1 ‰.
Embodiment 2
Manufacturing dimension is that the detailed process of petroleum casing pipe of 244.5 * 11.99mm is as follows:
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with electric arc furnace, after external refining and vacuum outgas, the Chemical Composition that obtains molten steel is by weight percentage: C:0.14%, Si:0.32%, Mn:0.66%, Cr:0.41%, Mo:0.71%, Al:0.025%, Ti:0.013%, V:0.12%, N:0.0041%, Nb:0.005%, Ca:0.0013%, Mg:0.00185%, B:0.0012%, P:0.008%, S:0.001%, N:0.0027%, surplus is an iron.The A value is 0.5907%.
Above-mentioned high purity steel water continuous casting is become the circle base.With cooled continuously cast bloom at the rotary heating furnace internal heating, the heating of pipe blank temperature is 1190 ℃, heat centering temperature is 1140 ℃, adopt Mannesmann's method hot piercing, retained mandrel is rolling and reducing and rolling, the finishing temperature of tandem rolling is not less than 950 ℃, the final reducing and rolling temperature of deciding is controlled at 920 ℃, is in more than the Ar3 critical temperature.The hollow forging of deciding behind the reducing and rolling directly enters the cold bed of deciding reducing and rolling unit back, and is air-cooled to Ar3 critical temperature below 810～830 ℃, crystal grain thinning.Directly send into heat treated reheating furnace after the cooled hollow forging sawing, be heated to 950 ℃ of insulations 10 minutes, carry out quenching heat treatment, quenchant is the water-based hardening liquid, and speed of cooling is 20 ℃/second.690 ℃ of even heating 30 minutes, carry out temper.At 560 ℃ of secondary hot sizes, the diameter distortion rate of secondary sizing is controlled at 3.6%.520 ℃ of hot straightenings, flaw detection at last obtains the finished product petroleum casing pipe.
The index that the telescopic mechanical property that obtains reaches is as follows:
Yield strength: 891MPa
Ultimate strength: 926Mpa
Yield ratio: 96.2%
Sulfurated hydrogen stress etching-resisting threshold value with the measurement of NACE TM 0177-96A method: 95% SMYS
Unrelieved stress: 107.59Mpa
The geometrical dimension of petroleum casing pipe
Diameter range: 244.77mm (D+0.11%D)～246.23mm (D+0.77%D)
Out of roundness :≤0.6mm
Wall thickness :≤-4.5%t～7.0%t
Straight degree: pipe end≤1.2mm/m, body≤1.1 ‰
Embodiment 3
Manufacturing dimension is that the detailed process of petroleum casing pipe of 244.5 * 11.99mm is as follows:
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with electric arc furnace, after external refining and vacuum outgas, the Chemical Composition that obtains molten steel is by weight percentage: C:0.13%, Si:0.37%, Mn:0.71%, Cr:0.38%, Mo:0.49%, Al:0.021%, Ti:0.018%, V:0.10%, Nb:0.0045%, Ca:0.0027%, Mg:0.0025%, B:0.0019%, P:0.007%, S:0.001%, N:0.0012%, surplus is an iron.The A value is 0.5113%.
Above-mentioned high purity steel water continuous casting is become the circle base.With cooled continuously cast bloom at the rotary heating furnace internal heating, the heating of pipe blank temperature is 1190 ℃, heat centering temperature is 1140 ℃, adopt Mannesmann's method hot piercing, retained mandrel is rolling and reducing and rolling, the finishing temperature of tandem rolling is not less than 950 ℃, the final reducing and rolling temperature of deciding is controlled at 920 ℃, is in more than the Ar3 critical temperature.The hollow forging of deciding behind the reducing and rolling directly enters the cold bed of deciding reducing and rolling unit back, and is air-cooled to Ar3 critical temperature below 810～830 ℃, crystal grain thinning.Directly send into heat treated reheating furnace after the cooled hollow forging sawing, be heated to 950 ℃ of insulations 10 minutes, carry out quenching heat treatment, quenchant is the water-based hardening liquid, and speed of cooling is 20 ℃/second.700 ℃ of even heating 30 minutes, carry out temper.At 560 ℃ of secondary hot sizes, the diameter distortion rate of secondary sizing is controlled at 4.1%.520 ℃ of hot straightenings, flaw detection at last obtains the finished product petroleum casing pipe.
The index that the telescopic mechanical property that obtains reaches is as follows:
Yield strength: 875MPa
Ultimate strength: 928Mpa
Yield ratio: 94.3%
Sulfurated hydrogen stress etching-resisting threshold value with the measurement of NACE TM 0177-96A method: 95% SMYS
Unrelieved stress: 107.59Mpa
The geometrical dimension of petroleum casing pipe
Diameter range: 245.71 (D+0.49%D) mm～246.76 (D+0.92%D) mm
Out of roundness :≤0.6mm
Wall thickness :≤-4.5%t～7.0%t
Straight degree: pipe end≤1.2mm/m, body≤1.1 ‰.
Claims (4)
1, a kind of petroleum casing pipe of sulfurated hydrogen stress etching-resisting, it is characterized in that, form by following compositions by weight percentage: C:0.12～0.18%, Si:0.10～0.60%, Mn:0.05～1.0%, Cr:0.20～1.0%, Mo:0.10～0.80%, Al:0.005～0.05%, Ti:0.005～0.02%, V:0.05～0.15%, Nb:0.002～0.02%, Ca:0.0003～0.005%, Mg:0.0003～0.005%, B:0.0003～0.003%, P≤0.020%, S≤0.005%, N≤0.005%, the Fe of surplus, carbon wherein, manganese, chromium, the weight percent of molybdenum is determined by Comprehensive Control formula A=C%+ (Mn%/5)+(Cr%/5)+(Mo%/3), A is a carbon in the formula, manganese, chromium, the comprehensive content of molybdenum, the scope of A are 0.45-0.60%.
2, the manufacture method of the petroleum casing pipe of the described sulfurated hydrogen stress etching-resisting of a kind of claim 1 is characterized in that, comprises the steps:
(1) batching is smelted
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with the eccentric stove of electric arc, through external refining and vacuum outgas method, the content of impurity in the control steel, improve the purity of steel, the molten steel composition that obtains the manufacturing petroleum casing pipe is by weight percentage: C:0.12～0.18%, Si:0.10～0.60%, Mn:0.05～1.0%, Cr:0.20～1.0%, Mo:0.10～0.80%, Al:0.005～0.05%, Ti:0.005～0.02%, V:0.05～0.15%, Nb:0.002～0.02%, Ca:0.0003～0.005%, Mg:0.0003～0.005%, B:0.0003～0.003%, P≤0.020%, S≤0.005%, N≤0.005%, surplus are iron; Wherein the weight percent of carbon, manganese, chromium, molybdenum determines that by Comprehensive Control formula A=C%+ (Mn%/5)+(Cr%/5)+(Mo%/3) A is the comprehensive content of carbon, manganese, chromium, molybdenum in the formula, and the weight percent of A is 0.45-0.60%;
(2) continuous casting and rolling
Above-mentioned high purity steel water continuous casting is become the circle base, and with the cooled continuously cast bloom rotary heating furnace internal heating of packing into, the heating of pipe blank temperature is 1160～1210 ℃, afterwards, hot centering, hot piercing, tandem rolling, decides tube reducing; Wherein, heat centering temperature is 1110～1150 ℃, and hot piercing temperature is 1050～1110 ℃, and the finishing temperature of tandem rolling is not less than 950 ℃, and the finishing temperature of deciding tube reducing is not less than 900 ℃.
(3) pipe processing
In the back of deciding the reducing and rolling unit cold bed is set, the hollow forging of deciding behind the reducing and rolling directly enters cold bed, and is air-cooled to below the Ar3 critical temperature 10 ℃～40 ℃, crystal grain thinning; Directly send into heat treated reheating furnace after the cooled hollow forging sawing, be heated to 950 ℃ ± 10 ℃, carry out quenching heat treatment, be incubated 10 minutes, quenchant is the water-based hardening liquid, and speed of cooling is 20 ℃/second; Carry out tempering heat treatment after the quenching, tempering temperature is 670～710 ℃, adopts air cooling; After the hollow forging thermal treatment, handle through secondary sizing and hot straightening, flaw detection obtains the finished product petroleum casing pipe at last, and wherein, secondary sizing temperature is between 550～600 ℃, and the hot straightening temperature is between 500 ℃～540 ℃.
3, the manufacture method of the petroleum casing pipe of sulfurated hydrogen stress etching-resisting according to claim 2 is characterized in that, the diameter distortion rate of secondary sizing is 3%～5%.
4, the manufacture method of the petroleum casing pipe of sulfurated hydrogen stress etching-resisting according to claim 2 is characterized in that, the telescopic geometric accuracy satisfies following requirement: the limit of error of diameter: 0.995%～1.01%D, and wherein, D is a diameter; Out of roundness :≤1.1mm, wall thickness :≤-8.0%t～8.0%t, straight degree: pipe end≤1.5mm/m, body≤1.5 ‰.
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