CN102330018A - Seamless steel tube used for thick-wall petroleum casing collar material and production method thereof - Google Patents
Seamless steel tube used for thick-wall petroleum casing collar material and production method thereof Download PDFInfo
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- CN102330018A CN102330018A CN201110144832A CN201110144832A CN102330018A CN 102330018 A CN102330018 A CN 102330018A CN 201110144832 A CN201110144832 A CN 201110144832A CN 201110144832 A CN201110144832 A CN 201110144832A CN 102330018 A CN102330018 A CN 102330018A
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Abstract
The invention discloses a seamless steel tube used for a thick-wall petroleum casing collar material and a production method thereof, relates to a seamless steel tube and a production method thereof and solves the problems of complex preparation technology and high cost of the seamless steel tube used for a thick-wall K55-steel grade petroleum casing collar material. The seamless steel tube comprises the following components in percentage by weight: 0.31-0.35% of C, 0.20-0.35% of Si, 1.45-1.60% of Mn, 0.02-0.04% of V, 0.015-0.040% of Alsol, less than or equal to 0.020% of S, less than or equal to 0.020% of P, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Ni, less than or equal to 0.15% of Cu, less than or equal to 0.10% of Mo and the balance of Fe. The components are smelted by a converter, refined by a refining furnace, continuously cast and rolled. The seamless steel tube reaches the K55 steel grade, the wall thickness is 20.24mm, the yield strength is 379-552MPa, the tensile strength is more than or equal to 655MPa, the after-breaking elongation is more than or equal to 19%, and the impacting force is more than or equal to 20J.
Description
Technical field
The present invention relates to a kind of weldless steel tube and working method thereof.
Background technology
The widely used K55 steel level oil bushing of petroleum industry coupling material is used weldless steel tube at present; The general mode that adopts normalizing in the operation of rolling to handle or roll post-heat-treated is produced; Because increased the reheat technology or the heat treatment step of steel pipe, the manufacturing cost of weldless steel tube increases considerably.
Summary of the invention
The objective of the invention is to use the weldless steel tube complicated process of preparation in order to solve existing heavy wall K55 steel level oil bushing coupling material, the problem that manufacturing cost is high the invention provides a kind of thick wall petroleum casing coupling material with weldless steel tube and working method thereof.
Thick wall petroleum casing coupling material of the present invention is used weldless steel tube, and its chemical ingredients is following by weight percentage: C:0.31%～0.35%, Si:0.20%～0.35%, Mn:1.45%～1.60%; V:0.02%～0.04%, Alsol (aluminium is dissolved in acid): 0.015%～0.040%, S≤0.020%; P≤0.020%, Cr≤0.20%, Ni≤0.20%; Cu≤0.15%, Mo≤0.10%, surplus is an iron.
Thick wall petroleum casing coupling material of the present invention is realized through following steps with the working method of weldless steel tube:
Step 1, converter smelting: to molten iron adopt top, the end again the mode of blowing smelt molten steel, wherein, it is 0.85～0.95MPa that top blast oxygen work oxygen is pressed, oxygen flow is 16000～17000m
3/ h, oxygen supply intensity are 3.5～3.8Nm
3/ (t.min), pure oxygen supply time is 14～16min; Argon bottom-blowing pressure is 0.3～1.3MPa, and the argon bottom-blowing flow is 50～120m
3/ h;
Step 2, tapping and last steel: when molten steel is injected ladle by tap hole, in ladle, add ferroaluminium, ferro-vanadium and silicomanganese, add pre-melted slag then; Make ladle top slag; Then ladle is delivered to refining furnace, blowing argon gas in control tapping and the last steel process, wherein; Control ferroaluminium add-on is 0.02%～0.04% of a steel quality; The ferro-vanadium add-on is 0.02%～0.04% of a steel quality, and the silicomanganese add-on is 1.4%～1.6% of a steel quality, and the pre-melted slag add-on is to add 3～4Kg in the molten steel per ton;
Step 3, refining furnace refining: in step 2, be delivered to adding refining pre-melted slag, lime, calcium carbide and aluminum shot in the molten steel in the ladle in the refining furnace; Control and add refining pre-melted slag 1.5～2.0kg, lime 2.0～3.0kg, calcium carbide 0.2～0.3kg and aluminum shot 0.2～0.4kg in the molten steel per ton; Feed silicon-calcium wire then and carry out the calcium processing; Ca/S＞0.3 in the molten steel after control calcium is handled; Ca/Alsol (aluminium is dissolved in acid) is 0.15～0.20, with Argon stirring intensity soft blow 6～10min of 0.2～0.3MPa, gets pure molten steel again;
Step 4, continuous casting: continuous caster adopts the mode of ladle sleeve pipe blowing argon gas, the whole submerged nozzle of tundish, the slag absorbing agent of tundish molten steel and carbonization rice husk double shielding to realize the whole process protection cast; Ladle sleeve pipe argon flow amount is controlled at 300～400L/min; Tundish monobloc(k)type mouth of a river alignment deviation ± 3mm; Insert the following 100mm of mold liquid steel level, aluminium loss＜0.005% is dissolved in the acid of casting process molten steel, adopts oscillatory type steel ladle slag unloading automatic detecting system control slag to get into tundish; Servo apply hydraulic pressure mold liquid level automatic control system; Adopt external placed type mold electromagnetic mixing apparatus again, stirring parameter is 350A, 2Hz, adopts four-part form automatic distribution water system.
Step 5, rolling: the continuously cast bloom that step 4 is obtained places in the rotary heating furnace, and it is following to control each section Heating temperature: 900～1150 ℃ of preheating sections, heat one section 1200～1250 ℃; Heat two sections 1240～1270 ℃, 1230～1260 ℃ of soaking zones, control milling train temperature out is 970～1000 ℃; Be controlled within 150 minutes to total heat-up time of coming out of the stove from going into stove; After the hollow forging surface high pressure water dephosphorization of 16～20MPa, get into sizing mill then, 850～890 ℃ of control sizing mill temperature outs, the cooling fast of in the rollgang operational process, spraying again; Cold bed temperature is 610～630 ℃ in the control, gets thick wall petroleum casing coupling material and uses weldless steel tube.
Thick wall petroleum casing coupling material of the present invention reaches the K55 grade of steel with weldless steel tube; Can reach the limit wall thickness of 20.24mm; Metal microstructure is ferritic+synusia shape perlite, and thick wall petroleum casing coupling material of the present invention is following with the mechanical performance index of weldless steel tube:
Ys (Rel): 379～552MPa
Tensile strength (Rm): >=655MPa
Elongation after fracture (A): >=19%
Ballistic work AK
V(T):>=20J.
Thick wall petroleum casing coupling material of the present invention carries out reasonably optimizing with weldless steel tube to the carbon in the steel pipe, manganese composition and carries out narrow Composition Control (realizing with the step 3 of the working method of weldless steel tube through thick wall petroleum casing coupling material of the present invention); Add an amount of v element simultaneously and carry out the crystal grain thinning processing; Again through heating of the optimization continuously cast bloom in the steel rolling production technique and controlled chilling method; Further crystal grain thinning; Grain fineness number reaches more than 5 grades, makes hot rolling attitude weldless steel tube homogeneous microstructure, stable mechanical property, guarantees that hot rolling attitude weldless steel tube has good impelling strength under higher-strength.
K55 steel level oil bushing coupling material of the present invention is guaranteeing that with weldless steel tube steel pipe P, S chemical ingredients and mechanical property satisfy on the basis of API Spec 5CT standard-required; Carry out the optimization of steel pipe chemical ingredients and rolling technology; Reduce manufacturing cost, make enterprise rely on the optimum cost performance of this product to capture one seat with weldless steel tube manufacturing field at petroleum casing pipe.
Top blast oxygen adopts constant voltage to become the rifle operation in the step 1 of the present invention; Rationally control top blowing oxygen atmospheric pressure and oxygen lance position are to regulate in the mixing effect in control molten bath effectively; With reach blowing steadily, tap to tap time weak point, decarburization, silicon falls; And objectionable constituent and foreign material in the removal steel, guarantee that molten steel is clean.
In tapping process, add ferroaluminium, ferro-vanadium and silicomanganese in the step 2 and carry out deoxidation alloying, add pre-melted slag and make ladle top slag.Tapping and last steel process realize omnidistance Argon with even composition and temperature, promote floating foreign.
The LF refining furnace is adopted in refining in the step 3; The top slag that utilizes converter to form is realized quick slagging; Add calcium carbide formation foamy slag and guarantee sufficient submerged arc effect; Thereby realize 5 ℃/min above temperature rise rate, can control the Argon stirring intensity of 0.3～1.3MPa according to the whole refining process of actual needs of changing slag and intensification, employing refining pre-melted slag 1.5～2.0kg/t, lime 2.0～3.0kg/t, calcium carbide 0.2～0.3kg/t, aluminum shot 0.2～0.4kg/t make white slag and carry out diffusive deoxidation and desulfurization; Final sulphur content≤0.010% that guarantees in the molten steel, T [O]≤25PPm; Feeding silicon-calcium wire to the sufficient molten steel of composition, temperature and deoxidation and carry out calcium and handle, is 1.5～2.0m/t according to [S] and Alsol (aluminium is dissolved in acid) the Composition Control silicon-calcium wire add-on of molten steel, guarantees Ca/S＞0.3, Ca/Alsol:0.15～0.20, assurance deoxidation products Al
2O
3Abundant sex change, line feeding finishes the back with the Argon stirring intensity soft blow of 0.2～0.3Mpa 6～10 minutes, and inclusion is fully floated, and improves the purity of molten steel.
Continuous caster adopts the mode of ladle sleeve pipe blowing argon gas, the whole submerged nozzle of tundish, the slag absorbing agent of tundish molten steel and carbonization rice husk double shielding to realize the whole process protection cast in the step 4, prevents the secondary oxidation of molten steel; Adopt the oscillatory type steel ladle slag unloading automatic detecting system farthest to control slag and get into tundish; Servo apply hydraulic pressure mold liquid level automatic control system realizes the stable cast of mold liquid level ± 3mm again, the volume slag in the control casting process; Adopt external placed type mold electromagnetic mixing apparatus to realize the low overheat cast again, guarantee the homogeneous microstructure of continuously cast bloom, stirring parameter 350A, 2Hz; Adopt four-part form automatic distribution water system again, realize of linear change and the uniformly distributing of secondary cooling water amount, guarantee the cooling of continuously cast bloom secondary evenly with pulling rate.
Continuously cast bloom single cloth in rotary heating furnace in the step 5 is controlled within 150 minutes to total heat-up time of coming out of the stove from going into stove.
Description of drawings
Fig. 1 is the metallographic microstructure figure of the thick wall petroleum casing coupling material of embodiment 22 preparations with the outer wall of weldless steel tube; Fig. 2 is the intermediary metallographic microstructure figure of the thick wall petroleum casing coupling material of embodiment 22 preparations with weldless steel tube; Fig. 3 is the metallographic microstructure figure of the thick wall petroleum casing coupling material of embodiment 22 preparations with the inwall of weldless steel tube.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: this embodiment is that thick wall petroleum casing coupling material is used weldless steel tube, and thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.31%～0.35%, Si:0.20%～0.35%, Mn:1.45%～1.60%; V:0.02%～0.04%, Alsol (aluminium is dissolved in acid): 0.015%～0.040%, S≤0.020%; P≤0.020%, Cr≤0.20%, Ni≤0.20%; Cu≤0.15%, Mo≤0.10%, surplus is an iron.
The thick wall petroleum casing coupling material of this embodiment reaches the K55 grade of steel with weldless steel tube, can reach the limit wall thickness of 20.24mm, and the thick wall petroleum casing coupling material of this embodiment is following with the mechanical performance index of weldless steel tube:
Ys (Rel): 379～552Mpa
Tensile strength (Rm): >=655Mpa
Elongation after fracture (A): >=19%
Ballistic work AK
V(T):>=20J.
The thick wall petroleum casing coupling material of this embodiment uses the metal microstructure of weldless steel tube to be ferritic+synusia shape perlite; Grain fineness number reaches more than 5 grades; Hot rolling attitude weldless steel tube homogeneous microstructure, stable mechanical property have guaranteed that hot rolling attitude weldless steel tube has good impelling strength under higher-strength.
Embodiment two: what this embodiment and embodiment one were different is that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.31%～0.34%, Si:0.23%～0.32%, Mn:1.48%～1.55%; V:0.025%～0.038%, Alsol (aluminium is dissolved in acid): 0.018%～0.030%, S≤0.015%; P≤0.018%, Cr≤0.10%, Ni≤0.15%; Cu≤0.10%, Mo≤0.02%, surplus is an iron.Other parameter is identical with embodiment one.
Embodiment three: what this embodiment and embodiment one were different is that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.31%～0.33%, Si:0.25%～0.30%, Mn:1.50%～1.53%; V:0.03%～0.035%, Alsol (aluminium is dissolved in acid): 0.02%～0.025%, S≤0.01%; P≤0.015%, Cr≤0.05%, Ni≤0.08%; Cu≤0.05%, Mo≤0.005%, surplus is an iron.Other parameter is identical with embodiment one.
Embodiment four: what this embodiment and embodiment one were different is that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.32%, Si:0.27%, Mn:1.51%; V:0.032%, Alsol (aluminium is dissolved in acid): 0.022%, S≤0.006%; P≤0.013%, Cr≤0.02%, Ni≤0.01%; Cu≤0.02%, Mo≤0.001%, surplus is an iron.Other parameter is identical with embodiment one.
Embodiment five: this embodiment is that it is realized through following steps like the working method of embodiment one described thick wall petroleum casing coupling material with weldless steel tube:
Step 1, converter smelting: to molten iron adopt top, the end again the mode of blowing smelt molten steel, wherein, it is 0.85～0.95MPa that top blast oxygen work oxygen is pressed, oxygen flow is 16000～17000m
3/ h, oxygen supply intensity are 3.5～3.8Nm
3/ (t.min), pure oxygen supply time is 14～16min; Argon bottom-blowing pressure is 0.3～1.3MPa, and the argon bottom-blowing flow is 50～120m
3/ h;
Step 2, tapping and last steel: when molten steel is injected ladle by tap hole, in ladle, add ferroaluminium, ferro-vanadium and silicomanganese, add pre-melted slag then; Make ladle top slag; Then ladle is delivered to refining furnace, blowing argon gas in control tapping and the last steel process, wherein; Control ferroaluminium add-on is 0.02%～0.04% of a steel quality; The ferro-vanadium add-on is 0.02%～0.04% of a steel quality, and the silicomanganese add-on is 1.4%～1.6% of a steel quality, and the pre-melted slag add-on is to add 3～4Kg in the molten steel per ton;
Step 3, refining furnace refining: in step 2, be delivered to adding refining pre-melted slag, lime, calcium carbide and aluminum shot in the molten steel in the ladle in the refining furnace; Control and add refining pre-melted slag 1.5～2.0kg, lime 2.0～3.0kg, calcium carbide 0.2～0.3kg and aluminum shot 0.2～0.4kg in the molten steel per ton; Feed silicon-calcium wire then and carry out the calcium processing; Ca/S＞0.3 in the molten steel after control calcium is handled; Ca/Alsol (aluminium is dissolved in acid) is 0.15～0.20, with Argon stirring intensity soft blow 6～10min of 0.2～0.3MPa, gets pure molten steel again;
Step 4, continuous casting: continuous caster adopts the mode of ladle sleeve pipe blowing argon gas, the whole submerged nozzle of tundish, the slag absorbing agent of tundish molten steel and carbonization rice husk double shielding to realize the whole process protection cast; Ladle sleeve pipe argon flow amount is controlled at 300～400L/min; Tundish monobloc(k)type mouth of a river alignment deviation ± 3mm; Insert the following 100mm of mold liquid steel level, aluminium loss＜0.005% is dissolved in the acid of casting process molten steel, adopts oscillatory type steel ladle slag unloading automatic detecting system control slag to get into tundish; Servo apply hydraulic pressure mold liquid level automatic control system realizes the cast of mold liquid level ± 3mm; Adopt external placed type mold electromagnetic mixing apparatus to realize the low overheat cast again, stirring parameter is 350A, 2Hz, adopts four-part form automatic distribution water system.
Step 5, rolling: the continuously cast bloom that step 4 is obtained places in the rotary heating furnace, and it is following to control each section Heating temperature: 900～1150 ℃ of preheating sections, heat one section 1200～1250 ℃; Heat two sections 1240～1270 ℃, 1230～1260 ℃ of soaking zones, control milling train temperature out is 970～1000 ℃; Be controlled within 150 minutes to total heat-up time of coming out of the stove from going into stove; After the hollow forging surface high pressure water dephosphorization of 16～20MPa, get into sizing mill then, 850～890 ℃ of control sizing mill temperature outs, the cooling fast of in the rollgang operational process, spraying again; Cold bed temperature is 610～630 ℃ in the control, gets thick wall petroleum casing coupling material and uses weldless steel tube.
The Nm of unit of the oxygen supply intensity in this embodiment step 1
3/ (t.min) cubic meter PM per ton is marked in expression.The process that in the step 2 ladle is delivered to refining furnace is steel.The quality purity of aluminum shot reaches more than 99.5% in the step 3.
The thick wall petroleum casing coupling material that this embodiment obtains is following by weight percentage with the chemical ingredients of weldless steel tube: C:0.31%～0.35%, Si:0.20%～0.35%, Mn:1.45%～1.60%; V:0.02%～0.04%, Alsol (aluminium is dissolved in acid): 0.015%～0.040%, S≤0.020%; P≤0.020%, Cr≤0.20%, Ni≤0.20%; Cu≤0.15%, Mo≤0.10%, surplus is an iron.
The working method of this embodiment realizes the carbon in the steel pipe, manganese composition are carried out reasonably optimizing and carry out narrow Composition Control through step 3; Add an amount of v element simultaneously and carry out the crystal grain thinning processing; Heat and the controlled chilling method through the optimization continuously cast bloom in the steel rolling production technique again, further crystal grain thinning, grain fineness number reaches more than 5 grades; Make hot rolling attitude weldless steel tube homogeneous microstructure, stable mechanical property, guaranteed that hot rolling attitude weldless steel tube has good impelling strength under higher-strength.
Embodiment six: this embodiment and embodiment five are different is that top blast oxygen work oxygen is pressed and is 0.9MPa in the step 1, and oxygen flow is 16500m
3/ h, oxygen supply intensity are 3.6Nm
3/ (t.min), pure oxygen supply time is 15min.Other step and parameter are identical with embodiment five.
Embodiment seven: what this embodiment was different with embodiment five or six is that argon bottom-blowing pressure is 0.5～1.0MPa in the step 1, and the argon bottom-blowing flow is 60～100m
3/ h.Other step and parameter and embodiment five or six phase are together.
Embodiment eight: what this embodiment was different with embodiment five or six is that argon bottom-blowing pressure is 0.8MPa in the step 1, and the argon bottom-blowing flow is 80m
3/ h.Other step and parameter and embodiment five or six phase are together.
Embodiment nine: this embodiment is different with one of embodiment five to eight is that ferroaluminium in the step 2 is made up of 45% the Al and the Fe of surplus by mass percent; Ferro-vanadium is pressed mass percent and is made up of 50% the V and the Fe of surplus; Silicomanganese is pressed mass percent and is made up of 60%～67% Mn, 17%～20% Si and the Fe of surplus, and that concrete is FeMn64Si18.Other step and parameter are identical with one of embodiment five to eight.
Embodiment ten: what this embodiment was different with one of embodiment five to nine is that pre-melted slag is the pre-melted slag that Henan Xi Bao group company produces in the step 2, and composition is following by weight percentage: CaO:42%～52%, Al
2O
3: 35%～45%, MgO:2%～8%, SiO2 :≤5%, S:0.12%.Other step and parameter are identical with one of embodiment five to nine.
Embodiment 11: what this embodiment was different with one of embodiment five to ten is that control ferroaluminium add-on is 0.025% of a steel quality in the step 2; The ferro-vanadium add-on is 0.03% of a steel quality; The silicomanganese add-on is 1.5% of a steel quality, and the pre-melted slag add-on is to add 3Kg in the molten steel per ton.Other step and parameter are identical with one of embodiment five to ten.
Embodiment 12: what this embodiment was different with one of embodiment five to 11 is that the refining pre-melted slag is the pre-melted slag that Henan Xi Bao group company produces in the step 3, and composition is following by weight percentage: CaO:42%～52%, Al
2O
3: 35%～45%, MgO:2%～8%, SiO2 :≤5%, S:0.12%.Other step and parameter are identical with one of embodiment five to nine.
Embodiment 13: what this embodiment was different with one of embodiment five to 12 is to add refining pre-melted slag 1.8kg, lime 2.5kg, calcium carbide 0.25kg and aluminum shot 0.3kg in the step 3 in the control molten steel per ton.Other step and parameter are identical with one of embodiment five to 12.
Embodiment 14: this embodiment is different with one of embodiment five to 13 is with the Argon stirring intensity soft blow 8min of 0.25MPa in the step 3.Other step and parameter are identical with one of embodiment five to 13.
Embodiment 15: what this embodiment was different with one of embodiment five to 14 is that each section of control Heating temperature is following in the step 5: 1000～1100 ℃ of preheating sections; Heat one section 1210～1240 ℃; Heat two sections 1260～1270 ℃; 1240～1260 ℃ of soaking zones, control milling train temperature out is 975～990 ℃.Other step and parameter are identical with one of embodiment five to 14.
Embodiment 16: what this embodiment was different with one of embodiment five to 14 is that each section of control Heating temperature is following in the step 5: 1035 ℃ of preheating sections; Heat one section 1230 ℃; Heat two sections 1266 ℃, 1253 ℃ of soaking zones, control milling train temperature out is 984 ℃.Other step and parameter are identical with one of embodiment five to 14.
Embodiment 17: what this embodiment was different with one of embodiment five to 16 is to control 880～886 ℃ of sizing mill temperature outs in the step 5.Other step and parameter are identical with one of embodiment five to 16.
Embodiment 18: what this embodiment was different with one of embodiment five to 16 is to control 883 ℃ of sizing mill temperature outs in the step 5.Other step and parameter are identical with one of embodiment five to 16.
Embodiment 19: what this embodiment was different with one of embodiment five to 18 is that the last cold bed temperature of control is 620～630 ℃ in the step 5.Other step and parameter are identical with one of embodiment five to 18.
Embodiment 20: what this embodiment was different with one of embodiment five to 18 is that the last cold bed temperature of control is 626 ℃ in the step 5.Other step and parameter are identical with one of embodiment five to 18.
Embodiment 21: this embodiment is that thick wall petroleum casing coupling material is used weldless steel tube, and thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.32%, Si:0.27%, Mn:1.51%; V:0.032%, Alsol (aluminium is dissolved in acid): 0.022%, S≤0.006%; P≤0.013%, Cr≤0.02%, Ni≤0.01%; Cu≤0.02%, Mo≤0.001%, surplus is an iron.
The thick wall petroleum casing coupling material of this embodiment reaches the K55 grade of steel with weldless steel tube, can reach the limit wall thickness of 20.24mm, and the thick wall petroleum casing coupling material of this embodiment is following with the mechanical performance index of weldless steel tube:
Ys (Rel): 410～425Mpa
Tensile strength (Rm): 670～690Mpa
Elongation after fracture (A): 28%～31%
Ballistic work AK
V(T): 31～33.5J.
The thick wall petroleum casing coupling material of this embodiment reaches more than 5 grades with the grain fineness number of weldless steel tube, and hot rolling attitude weldless steel tube homogeneous microstructure, stable mechanical property have guaranteed that hot rolling attitude weldless steel tube has good impelling strength under higher-strength.
Embodiment 22: this embodiment be embodiment 21 described thick wall petroleum casing coupling material with weldless steel tube working method, it is realized through following steps:
Step 1, converter smelting: to molten iron adopt top, the end again the mode of blowing smelt molten steel, wherein, top blast oxygen work oxygen is pressed and is 0.9MPa, oxygen flow is 16500m
3/ h, oxygen supply intensity are 3.6Nm
3/ (t.min), pure oxygen supply time is 15min; Argon bottom-blowing pressure is 0.8MPa, and the argon bottom-blowing flow is 80m
3/ h;
Step 2, tapping and last steel: when molten steel is injected ladle by tap hole, in ladle, add ferroaluminium, ferro-vanadium and silicomanganese, add pre-melted slag then; Make ladle top slag; Then ladle is delivered to refining furnace, blowing argon gas in control tapping and the last steel process, wherein; Control ferroaluminium add-on is 0.025% of a steel quality; The ferro-vanadium add-on is 0.03% of a steel quality, and the silicomanganese add-on is 1.5% of a steel quality, and the pre-melted slag add-on is to add 3Kg in the molten steel per ton;
Step 3, refining furnace refining: in step 2, be delivered to adding refining pre-melted slag, lime, calcium carbide and aluminum shot in the molten steel in the ladle in the refining furnace; Control and add refining pre-melted slag 1.8kg, lime 2.5kg, calcium carbide 0.25kg and aluminum shot 0.3kg in the molten steel per ton; Feed silicon-calcium wire then and carry out the calcium processing, Ca/S＞0.3 in the molten steel after control calcium is handled, Ca/Alsol (aluminium is dissolved in acid) is 0.18; With the Argon stirring intensity soft blow 8min of 0.25MPa, get pure molten steel again;
Step 4, continuous casting: continuous caster adopts the mode of ladle sleeve pipe blowing argon gas, the whole submerged nozzle of tundish, the slag absorbing agent of tundish molten steel and carbonization rice husk double shielding to realize the whole process protection cast; Ladle sleeve pipe argon flow amount is controlled at 300～400L/min; Tundish monobloc(k)type mouth of a river alignment deviation ± 3mm; Insert the following 100mm of mold liquid steel level, aluminium loss＜0.005% is dissolved in the acid of casting process molten steel, adopts oscillatory type steel ladle slag unloading automatic detecting system control slag to get into tundish; Servo apply hydraulic pressure mold liquid level automatic control system realizes the cast of mold liquid level ± 3mm; Adopt external placed type mold electromagnetic mixing apparatus to realize the low overheat cast again, stirring parameter is 350A, 2Hz, adopts four-part form automatic distribution water system.
Step 5, rolling: the continuously cast bloom that step 4 is obtained places in the rotary heating furnace, and it is following to control each section Heating temperature: 1035 ℃ of preheating sections, heat one section 1230 ℃; Heat two sections 1266 ℃, 1253 ℃ of soaking zones, control milling train temperature out is 984 ℃; Be controlled within 150 minutes to total heat-up time of coming out of the stove from going into stove; After the hollow forging surface high pressure water dephosphorization of 16～20MPa, get into sizing mill then, 883 ℃ of control sizing mill temperature outs, the cooling fast of in the rollgang operational process, spraying again; Cold bed temperature is 626 ℃ in the control, gets thick wall petroleum casing coupling material and uses weldless steel tube.
Ferroaluminium is FeAl (Al:45wt.%, all the other are Fe) in this embodiment step 2, and ferro-vanadium is FeV (V:50wt.%, all the other are Fe), silicomanganese be FeMn64Si18 (Mn:64wt.%, Si:18wt.%).Pre-melted slag is that pre-melted slag is the pre-melted slag that Henan Xi Bao group company produces in the step 2, and composition is following by weight percentage: CaO:42%～52%, Al
2O
3: 35%～45%, MgO:2%～8%, SiO2 :≤5%, S:0.12%.。The refining pre-melted slag is that pre-melted slag is the pre-melted slag that Henan Xi Bao group company produces in the step 3, and composition is following by weight percentage: CaO:42%～52%, Al
2O
3: 35%～45%, MgO:2%～8%, SiO2 :≤5%, S:0.12%.。The quality purity of aluminum shot reaches more than 99.5% in the step 3.
Control punch machine temperature out is 1040 ℃ in this embodiment step 5.
This embodiment is used weldless steel tube to the embodiment 21 described thick wall petroleum casing coupling material that prepare, and its chemical ingredients is with consistent described in the embodiment 21.The thick wall petroleum casing coupling material for preparing reaches the K55 grade of steel with weldless steel tube, can reach the limit wall thickness of 20.24mm.
Adopt this embodiment to prepare I, II, III and four samples of IV, adopt GBT 228-2002 " metallic substance tensile test at room temperature method " and GBT 229-1994 " the metal summer is than test with notched test piece method " that four samples are carried out ys (Rel), tensile strength (Rm), elongation after fracture (A) and ballistic work AK respectively
V(T) performance test, wherein ballistic work AK
V(T) standard-required of test is: size 10 * 10 * 55mm, and 21 ℃ of temperature, laterally>=20.J.Test result is as shown in table 1.
Table 1
The thick wall petroleum casing coupling material that the production of this embodiment obtains is following with the mechanical performance index of weldless steel tube:
Ys (Rel): 410～425Mpa
Tensile strength (Rm): 670～690Mpa
Elongation after fracture (A): 28%～31%
Ballistic work AK
V(T): 31～33.5J.
The thick wall petroleum casing coupling material that this embodiment prepares with the metallographic microstructure figure of outer wall, centre and the inwall of weldless steel tube respectively like Fig. 1, Fig. 2 and shown in Figure 3.Can know that by Fig. 1, Fig. 2 and Fig. 3 the thick wall petroleum casing coupling material of this embodiment uses the weldless steel tube metal microstructure to be ferritic+synusia shape perlite, grain fineness number: 5.5 grades of mean grain sizes.
Claims (10)
1. a thick wall petroleum casing coupling material is used weldless steel tube, it is characterized in that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.31%～0.35%, Si:0.20%～0.35%, Mn:1.45%～1.60%; V:0.02%～0.04%, Alsol:0.015%～0.040%, S≤0.020%; P≤0.020%, Cr≤0.20%, Ni≤0.20%; Cu≤0.15%, Mo≤0.10%, surplus is an iron.
2. a kind of thick wall petroleum casing coupling material according to claim 1 is used weldless steel tube, it is characterized in that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.31%～0.34%, Si:0.23%～0.32%, Mn:1.48%～1.55%; V:0.025%～0.038%, Alsol:0.018%～0.030%, S≤0.015%; P≤0.018%, Cr≤0.10%, Ni≤0.15%; Cu≤0.10%, Mo≤0.02%, surplus is an iron.
3. a kind of thick wall petroleum casing coupling material according to claim 1 is used weldless steel tube, it is characterized in that thick wall petroleum casing coupling material is following with the chemical ingredients of weldless steel tube by weight percentage: C:0.32%, Si:0.27%, Mn:1.51%; V:0.032%, Alsol:0.022%, S≤0.006%; P≤0.013%, Cr≤0.02%, Ni≤0.01%; Cu≤0.02%, Mo≤0.001%, surplus is an iron.
4. thick wall petroleum casing coupling material as claimed in claim 1 is with the working method of weldless steel tube, it is characterized in that thick wall petroleum casing coupling material realizes through following steps with the working method of weldless steel tube:
Step 1, converter smelting: to molten iron adopt top, the end again the mode of blowing smelt molten steel, wherein, it is 0.85～0.95MPa that top blast oxygen work oxygen is pressed, oxygen flow is 16000～17000m
3/ h, oxygen supply intensity are 3.5～3.8Nm
3/ (t.min), pure oxygen supply time is 14～16min; Argon bottom-blowing pressure is 0.3～1.3MPa, and the argon bottom-blowing flow is 50～120m
3/ h;
Step 2, tapping and last steel: when molten steel is injected ladle by tap hole, in ladle, add ferroaluminium, ferro-vanadium and silicomanganese, add pre-melted slag then; Make ladle top slag; Then ladle is delivered to refining furnace, blowing argon gas in control tapping and the last steel process, wherein; Control ferroaluminium add-on is 0.02%～0.04% of a steel quality; The ferro-vanadium add-on is 0.02%～0.04% of a steel quality, and the silicomanganese add-on is 1.4%～1.6% of a steel quality, and the pre-melted slag add-on is to add 3～4Kg in the molten steel per ton;
Step 3, refining furnace refining: in step 2, be delivered to and add pro-molten refining slag, lime, calcium carbide and aluminum shot in the molten steel in the ladle in the refining furnace; Control and add pro-molten refining slag 1.5～2.0kg, lime 2.0～3.0kg, calcium carbide 0.2～0.3kg and aluminum shot 0.2～0.4kg in the molten steel per ton; Feed silicon-calcium wire then and carry out the calcium processing; Ca/S＞0.3 in the molten steel after control calcium is handled; Ca/Alsol is 0.15～0.20, with Argon stirring intensity soft blow 6～10min of 0.2～0.3MPa, gets pure molten steel again;
Step 4, continuous casting: continuous caster adopts the mode of ladle sleeve pipe blowing argon gas, the whole submerged nozzle of tundish, the slag absorbing agent of tundish molten steel and carbonization rice husk double shielding to realize the whole process protection cast; Ladle sleeve pipe argon flow amount is controlled at 300～400L/min; Tundish monobloc(k)type mouth of a river alignment deviation ± 3mm; Insert the following 100mm of mold liquid steel level, aluminium loss＜0.005% is dissolved in the acid of casting process molten steel, adopts oscillatory type steel ladle slag unloading automatic detecting system control slag to get into tundish; Servo apply hydraulic pressure mold liquid level automatic control system realizes the cast of mold liquid level ± 3mm; Adopt external placed type mold electromagnetic mixing apparatus to realize the low overheat cast again, stirring parameter is 350A, 2Hz, adopts four-part form automatic distribution water system.
Step 5, rolling: the continuously cast bloom that step 4 is obtained places in the rotary heating furnace, and it is following to control each section Heating temperature: 900～1150 ℃ of preheating sections, heat one section 1200～1250 ℃; Heat two sections 1240～1270 ℃, 1230～1260 ℃ of soaking zones, control milling train temperature out is 970～1000 ℃; Be controlled within 150 minutes to total heat-up time of coming out of the stove from going into stove; After the hollow forging surface high pressure water dephosphorization of 16～20MPa, get into sizing mill then, 850～890 ℃ of control sizing mill temperature outs, the cooling fast of in the rollgang operational process, spraying again; Cold bed temperature is 610～630 ℃ in the control, gets thick wall petroleum casing coupling material and uses weldless steel tube.
5. top blast oxygen work oxygen pressure is 0.9MPa in the step 1, and oxygen flow is 16500m
3/ h, oxygen supply intensity are 3.6Nm
3/ (t.min), pure oxygen supply time is 15min.
6. according to claim 4 or 5 described thick wall petroleum casing coupling material working method with weldless steel tube; It is characterized in that the ferroaluminium in the step 2 is made up of 45% the Al and the Fe of surplus by mass percent; Ferro-vanadium is pressed mass percent and is made up of 50% the V and the Fe of surplus, and silicomanganese is pressed mass percent and is made up of 60%～67% Mn, 17%～20% Si and the Fe of surplus.
7. according to claim 4 or 5 described thick wall petroleum casing coupling material working method with weldless steel tube; It is characterized in that control ferroaluminium add-on is 0.025% of a steel quality in the step 2; The ferro-vanadium add-on is 0.03% of a steel quality; The silicomanganese add-on is 1.5% of a steel quality, and the pre-melted slag add-on is to add 3Kg in the molten steel per ton.
8. according to claim 4 or 5 described thick wall petroleum casing coupling material working method, it is characterized in that adding in the control molten steel per ton in the step 3 refining pre-melted slag 1.8kg, lime 2.5kg, calcium carbide 0.25kg and aluminum shot 0.3kg with weldless steel tube.
9. according to claim 4 or 5 described thick wall petroleum casing coupling material working method with weldless steel tube; It is characterized in that each section of control Heating temperature is following in the step 5: 1035 ℃ of preheating sections; Heat one section 1230 ℃; Heat two sections 1266 ℃, 1253 ℃ of soaking zones, control milling train temperature out is 984 ℃.
10. according to claim 4 or 5 described thick wall petroleum casing coupling material working method, it is characterized in that in the step 5 883 ℃ of control sizing mill temperature outs with weldless steel tube.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN104117824A (en) * | 2014-07-22 | 2014-10-29 | 上海加宁新技术研究所 | Manufacturing method of super high pressure seamless alloy steel pipe |
| CN104975233A (en) * | 2015-06-11 | 2015-10-14 | 攀钢集团成都钢钒有限公司 | Production method of super-high strength and high tenacity structural alloy steel continuous cast round billet |
| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
| CN110735091A (en) * | 2019-11-05 | 2020-01-31 | 天津钢管制造有限公司 | Method for improving impact power of J K55 steel-grade oil well pipe by treating alloy steel with micro-titanium |
| CN112553535A (en) * | 2020-12-16 | 2021-03-26 | 黑龙江建龙钢铁有限公司 | High-strength corrosion-resistant oil well pipe with superfine crystal grains and production process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN104117824A (en) * | 2014-07-22 | 2014-10-29 | 上海加宁新技术研究所 | Manufacturing method of super high pressure seamless alloy steel pipe |
| CN104975233A (en) * | 2015-06-11 | 2015-10-14 | 攀钢集团成都钢钒有限公司 | Production method of super-high strength and high tenacity structural alloy steel continuous cast round billet |
| CN105420486A (en) * | 2015-11-03 | 2016-03-23 | 邯钢集团邯宝钢铁有限公司 | Heating control method of steel rolling heating furnace applicable to pipeline steel |
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| CN110735091A (en) * | 2019-11-05 | 2020-01-31 | 天津钢管制造有限公司 | Method for improving impact power of J K55 steel-grade oil well pipe by treating alloy steel with micro-titanium |
| CN112553535A (en) * | 2020-12-16 | 2021-03-26 | 黑龙江建龙钢铁有限公司 | High-strength corrosion-resistant oil well pipe with superfine crystal grains and production process thereof |
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Application publication date: 20120125 |