CN114480974A - Production method of high-strength fatigue-resistant sucker rod steel - Google Patents
Production method of high-strength fatigue-resistant sucker rod steel Download PDFInfo
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Abstract
The invention discloses a production method of high-strength fatigue-resistant sucker rod steel, which comprises the following process flows of: molten iron desulfurization pretreatment → electric furnace smelting → tapping deoxidation alloying, carburetion and inclusion removal → ladle inert gas bottom blowing stirring → LF refining treatment → continuous casting → casting blank slow cooling → rolling; designing components: c: 0.30-0.33%; si: 0.25-0.35%; mn: 0.95-1.10%; mo: 0.20-0.30%; p: less than or equal to 0.012 percent; s is less than or equal to 0.005 percent; ti: 0.045-0.055%; cr: 0.85-0.95%; al: 0.025-0.035%; cu is less than or equal to 0.10 percent; [ Ni ]]≤0.10%；[N]: less than or equal to 0.0045 percent; and then molten iron desulphurization pretreatment, electric furnace smelting and LF refining treatment are sequentially carried out: a certain amount of free oxygen is required to be contained in molten steel, the total oxygen content is controlled to be 0.0025-0.0035%, calcium treatment is carried out after LF (ladle furnace) is finished, the linear speed of calcium feeding is 3.0-3.5 m/s, calcium wires are fed to rapidly combine with oxygen to form CaO molecules, and CaO and Al are combined2O3Combining to form composite inclusion, and promoting the floating and removal of the inclusion through bottom blowing and stirring; and after the continuous casting cold inspection is qualified, furnace loading and rolling are carried out.
Description
Technical Field
The invention relates to a production method of high-strength fatigue-resistant sucker rod steel, belonging to the field of steel smelting material forming.
Background
The sucker rod is a slender rod used for the pumping well, and the sucker rod is connected with a polished rod at the upper part and an oil well pump at the lower part to play a role in transmitting power. The length of a single sucker rod is 7-10 m, the material of the sucker rod is generally low-carbon alloy steel, the sucker rod is connected in a well pipe by internal threads in a hooping mode one by one and extends to a piston at an underground oil layer, and oil is pumped through reciprocating motion. Along with the increase of the oil well depth, the self weight of the sucker rod is increased, the load of the sucker rod is increased, and the fatigue life of the sucker rod is influenced. Therefore, the design research and development of the high-strength, high-toughness and fatigue-resistant sucker rod steel reduces the self weight of the sucker rod, and the improvement of the service life of the sucker rod is the necessary way to promote the technical progress and the green low-carbon development of the petroleum industry.
In order to meet the oil extraction requirements of various complex deep oil wells, a plurality of new materials and new-structure sucker rods are developed and applied in sequence abroad. Domestic sucker rods are mainly D-level sucker rods. The latest standard SY/T5029-2013 of the domestic sucker rod only explains the basic mechanical property, the dimensional tolerance, the factory specifications and the like of the sucker rod, and the allowable stress of the sucker rod is not specified, so that the design of the H-level sucker rod with a higher level is influenced. For example, the H-grade rod is used for replacing the D-grade rod, the maximum diameter of the sucker rod is reduced from 22mm to 19mm, and the mass of the rod column is reduced by 20%. The application of the H-level sucker rod has the great advantages of reducing the diameter of the sucker rod and lightening the self weight of the sucker rod.
As the sucker rod bears the load which changes periodically in the using process and finally causes fatigue or corrosion fatigue failure, the fatigue life is the most important index for measuring the quality of the sucker rod. The fatigue resistance performance of the sucker rod is detected through the fatigue test of the ultrahigh-strength sucker rod sample, and the quality of the sucker rod is judged. Cutting a fracture on the high-strength failure sucker rod, carrying out microscopic fracture mechanism analysis on the fracture, wherein all fracture cracks originate from a surface corrosion pit, a propagation area has fatigue striations and secondary cracks, and the analysis shows that the fracture of the sucker rod is corrosion fatigue fracture. Thus. The development of the sucker rod steel with high strength, high toughness, fatigue resistance and long service life for the deep well sucker rod under variable load is suitable for the requirement of green development of the petroleum industry. The steel has high strength, high toughness, wear resistance and corrosion resistance, and is reflected in high steel purity of the material.
Non-metallic inclusions in the steel tend to be sources of fatigue cracks, e.g. sulphur combines with manganese to form large-grained MnS inclusions, the content of oxide inclusions is low, the deoxidation product of Al, Al2O3With MgO, CaO, SiO2Composite inclusions formed by oxides are the most main factors influencing the fatigue life of the sucker rod steel, the segregation of phosphorus in crystal boundaries causes the embrittlement of the crystal boundaries, the strength and the toughness are reduced, the high hydrogen content in the steel causes hydrogen-induced cracks on steel, most mainly, corrosive gases such as hydrogen sulfide exist in a petroleum well, hydrogen-induced white spots become crack sources through corrosion, and the fatigue resistance of the material is reduced. Therefore, it is an important approach to improve the fatigue resistance of high strength sucker rod steel to improve the purity of steel, control the segregation of continuous casting slab and the steel ribbon structure, and it is necessary to strictly control the nitrogen content in steel in order to prevent the age hardening of the material. Therefore, strict control of the contents of sulfur, phosphorus, oxygen, nitrogen, hydrogen and non-metallic inclusions is the primary condition for developing high-strength fatigue-resistant sucker rod steel.
Document retrieval
(1) Patent No. 200710037665.X discloses 'steel for high-strength high-toughness continuous sucker rod and a manufacturing method thereof', the sucker rod steel comprises the following chemical components in percentage by mass: c: 0.12% -0.22%, Si: 0.15% -0.40%, Mn: 0.30% -0.60%, Cr: 0.40-0.60%, Mo 0.20-0.40%, P: less than or equal to 0.020%; s: less than or equal to 0.015 percent, 0.015 to 0.050 percent of Ti, 0.015 to 0.050 percent of Al, Cu: not more than 0.30%, and [ O ]: less than or equal to 25 PPm%, [ H ]: less than or equal to 1.5PPm percent, and the balance of Fe and inevitable impurities. The tensile strength of the material is 890-1080MPa, the yield strength is 790-855MPa, the elongation after fracture is 20-23.5%, and the yield ratio of the material is 0.796-0.904. Impact energy greater than 110J
(2) Patent No. 201010279571.5 discloses "an ultra-high strength sucker rod steel", which contains the following main chemical components by percentage: c: 0.23% -0.46%, Si: 0.1% -0.3%, Mn: 1.25% -1.55%, Cr: 1.7-2.0%, Mo 0.10-0.20%, P: less than or equal to 0.025 percent; s: less than or equal to 0.025 percent, Ni: 0.10-0.20% and Cu less than or equal to 0.2%.
(3) Patent No. 200910113600.8 discloses "a high strength special sucker rod steel". The main chemical components contained in the fertilizer comprise the following components in percentage by weight: c: 0.18% -0.24%, Si: 0.15% -0.30%, Mn: 0.30% -0.50%, Cr: 1.7-2.0%, Mo 0.10-0.20%, P: less than or equal to 0.025 percent; s: less than or equal to 0.025 percent, Ni: 0.10 to 0.20 percent of Cu, less than or equal to 0.2 percent of Cu, and the balance of Fe and inevitable impurities. The tensile strength is more than 1050 MPa.
(4) Patent No. 201010292922.6 discloses "a multi-alloyed ultra-high strength sucker rod and its manufacturing method". The sucker rod steel comprises the following components in percentage by mass: c: 0.25% -0.29%, Si: 0.17% -0.37%, Mn: 0.50% -0.70%, Cr: 0.95% -1.2%, Mo 0.18% -0.25%, P: 0.001% -0.025%; s: 0.001% -0.025% of Ti, 0.015% -0.050% of Al, 0.015% -0.050% of [ O ]: not more than 20 PPm%, [ H ]: less than or equal to 3PPm percent, and the balance of Fe and inevitable impurities. The tensile strength of the material is 1125-1150MPa, the yield strength is 1020-1040MPa, the elongation after fracture is 16-20%, the yield ratio of the material is 0.895-0.915, and the yield ratio of the material is higher.
(5) The analysis of the failure cause of the breakage of a 30CrMoA HL-level sucker rod is published in the fourth period of 2021 of welded pipes, and the failure cause of the sucker rod is analyzed to be corrosion fatigue breakage. The analysis shows that the sucker rod is broken due to the combined action of factors such as the self structure of the sucker rod, high-stress alternating load, corrosive medium and the like, and the service life of the sucker rod is shortened.
Disclosure of Invention
The invention aims to provide a production method of high-strength fatigue-resistant sucker rod steel, which adopts a novel method to produce the high-strength, high-toughness and fatigue-resistant sucker rod steel and improves the fatigue fracture resistance of the sucker rod steel under the alternating large-load working condition.
A production method of high-strength anti-fatigue sucker rod steel,
1) and the process flow is as follows: molten iron desulfurization pretreatment → electric furnace smelting → tapping deoxidation alloying, carburetion and inclusion removal → ladle inert gas bottom blowing stirring → LF refining treatment → continuous casting → casting blank slow cooling → rolling;
2) and component design: c: 0.30-0.33%; si: 0.25-0.35%; mn: 0.95-1.10%; mo: 0.20-0.30%; p: less than or equal to 0.012 percent; s is less than or equal to 0.005 percent; ti: 0.045-0.055%; cr: 0.85-0.95%; al: 0.025-0.035%; cu is less than or equal to 0.10 percent; the content of [ Ni ] is less than or equal to 0.10 percent; [ N ]: less than or equal to 0.0045 percent, and the balance of iron and inevitable impurities;
3) and molten iron desulphurization pretreatment: the blast furnace molten iron station-entering temperature is 1320-: the main components of CaO and MgO account for 12 plus or minus 0.5 percent and AL2O3About 13% SiO260. + -. 2% of Na2O+K2The sum of O and the melting point is about 5 percent, the temperature of the soft melting point is less than or equal to 1200 ℃, the desulfurized slag is added to ensure that the desulfurized slag is reversely and dryly aggregated, the resulfurization of the molten iron is reduced, the removal of the top slag of the molten iron can after desulfurization is facilitated, and the S after the pretreatment of the molten iron]The content is not more than 0.001%; the addition amount of the slag thickener is 1kg per ton of iron, and the top slag of the hot-metal ladle is removed after treatment;
4) the method adopts electric furnace for primary smelting, and the quality requirements of the scrap steel are self-produced scrap steel and scrap steel in fields such as carbon structural steel, low-alloy structural steel and cold rolled steel crop endsThe method comprises the following steps that steel accounts for 65-70% of a metal material, the mass of the molten iron is about 35-40%, the molten iron is added into a furnace in the charging sequence, the molten iron is added, then scrap steel is added, active lime is added finally, the activity degree of the lime is not more than 320ml, the scrap steel and melting furnace slag are melted by the electric furnace, decarburization and dephosphorization are carried out, oxygen is blown in the whole smelting process to prevent the molten steel from being over oxidized, foam slag submerged arc smelting is adopted when an iron material is melted and furnace burden is melted, the oxygen pressure is adjusted according to melting and cleaning carbon in the electric furnace, meanwhile, the hit rate of end point carbon of the molten steel electric furnace is improved by using a scientific and reasonable flow ratio of an oxygen lance on the furnace wall and an oxygen lance on the furnace door, the target value of the end point carbon of the electric furnace is 0.04-0.08%, the phosphorus content of discharged from the electric furnace is not more than 0.008% and the sulfur content is not more than 0.008%, steel is left in the electric furnace after the electric furnace is discharged, and slag is strictly forbidden; adding lime at one time in the tapping process, sequentially adding carbon powder and calcium carbide, high-carbon ferrochrome and high-carbon ferromanganese, performing pre-deoxidation, recarburization and alloying, wherein the calcium carbide and the carbon powder are added when the tapping amount reaches 1/4 of the total amount, the calcium carbide and the carbon powder are completely added before tapping, simultaneously adding aluminum iron for deep deoxidation of molten steel, performing bottom argon blowing stirring on a ladle in the whole process of electric furnace tapping, determining the oxygen content in the molten steel of the ladle by using an oxygen determination instrument after tapping, feeding aluminum wire to supplement aluminum into the molten steel when the oxygen content in the molten steel is more than 50ppm, and controlling the aluminum content in the molten steel to be 0.030-0.050% after the bottom argon blowing stirring; slag washing during electric furnace tapping, wherein 0.30kg of aluminum iron is added into each ton of steel in order to prevent nitrogen increase of molten steel in the tapping process, then 1kg/t of fluorite and 3kg/t of lime are added to adjust the component content of the top slag of the steel ladle, so as to be beneficial to desulfurization and removal of non-metal impurities, 2.0kg/t of a steel ladle top slag modifying agent is added, and the main components and the content of the modifying agent are as follows: CaO and Al2O3Premelting slag, SiO2The content is not more than 5%, the aluminum content is 25-30%, and the mass percentage content of the pre-melted slag is as follows: CaO content about 45%, Al2O3The slag washing and top slag reforming are carried out to promote impurities to float in the molten steel and adsorb and remove the top slag;
5) LF refining method, refining initial stage 5EAdding a slag modifier into the LF refining top slag after 8 minutes, wherein the main components are SiC and CaC2、CaO、CaCO3Al plate mixture and SiO2Adjusting the top slag of the steel ladle by using inevitable impurities, wherein the components comprise 50 percent of CaO and CaCO320% of SiC, 10% of CaC2The content of 10 percent and the Al content of 10 percent are added, 1.5kg of steel is added in each ton, 1.0kg of steel is added in each ton in the initial stage of LF refining, and 0.5kg of steel is added in each ton in 12 minutes of LF refining, and the alkalinity and the viscosity of slag are adjusted to form foam slag to prevent the molten steel from being oxidized by contacting with air; in order to prevent nitrogen increase of molten steel in the LF treatment process, ensure diffusion deoxidation, adsorption and impurity removal of reduced refining slag, the temperature rise time of the molten steel needs to be shortened, the temperature rise time of the molten steel in LF power transmission is not more than 15 minutes, the retention time of refining deoxidation and white slag is ensured to be more than 15 minutes, the good basis of the LF refining slag is judged to be that the total amount of ferrous oxide and manganese oxide in the slag is not more than 1.0 percent according to F, analysis and sampling are carried out, and when [ Al ] in the steel is subjected to [ Al ] analysis and sampling]The s content is less than 0.20 percent, aluminum is added in the refining process to ensure that the Als in the steel before tapping]Between 0.020% and 0.030%; after LF treatment is finished, adding high-silicon ferrotitanium, wherein the content of titanium in the ferrotitanium is 30%, adding the ferrotitanium, stirring for 3 minutes by argon gas for calcium treatment, and then stirring for 8-12 min by argon gas under weak condition;
6) and LF refining treatment end point: a certain amount of free oxygen is required to be contained in molten steel, the total oxygen content is controlled to be 0.0025-0.0035%, calcium treatment is carried out after LF (ladle furnace) is finished, the linear speed of calcium feeding is 3.0-3.5 m/s, calcium wires are fed to rapidly combine with oxygen to form CaO molecules, and CaO and Al are combined2O3Combining to form large-particle low-melting-point aluminum and calcium oxide composite inclusion, floating and removing the inclusion by bottom blowing and stirring, wherein the calcium content in the molten steel is 0.0020-0.0035%, and then carrying out RH vacuum treatment, mainly dehydrogenation and denitrification, on the molten steel to ensure that the hydrogen content in the steel is not more than 1PPm, [ N ]]Less than or equal to 0.0040 percent, and other components meet the requirements of components of a smelted finished product;
7) and the continuous casting method comprises the following steps: the liquidus temperature of the molten steel of the steel grade is 1513 ℃, the control method of the internal quality of the casting blank, the square blank with the side length of 150mm of the continuous casting blank, the drawing speed is 1.3-1.60 m/min, the target value is 1.40 m/min, the superheat degree of the molten steel continuous casting is controlled to be 12-26 ℃, the target superheat degree is 15 ℃, the method for controlling the temperature drop of the molten steel in the continuous casting process is that the baking temperature of a steel ladle is more than 850 ℃, 300-400 kg of covering agent is added into a steel ladle of each furnace, the method adopted for preventing the secondary oxidation of the molten steel is that a middle ladle cover does not use a steel ladle cover, a refractory material ladle cover is required to be used, the service life of a middle ladle sizing water gap needs more than 6 hours, the sizing nozzle cannot be replaced in the continuous casting production process, in order to ensure the precision of finished carbon, a high-alkalinity low-carbon covering agent is adopted, the components are 60 percent of passivated lime powder with good spreading performance and 40 percent of wollastonite, and the thickness of the covering agent after melting is more than 40 millimeters; the method comprises the steps of adopting electromagnetic stirring and solidification tail end electromagnetic stirring dual stirring of a crystallizer, setting electromagnetic stirring frequency of the crystallizer to be 50HZ, current intensity to be 360A, solidification tail end frequency to be 50HZ, current intensity to be 320A, carrying out low-pulling-speed continuous casting, strictly prohibiting steel billet from generating central shrinkage cavity, carrying out hot acid cleaning on the steel billet, detecting central segregation to be not more than 0.5 level, slowly cooling the steel billet, keeping the temperature to be normal temperature, and carrying out furnace rolling after cold detection is qualified.
Billet rolling and material properties:
(1) the soaking temperature of the billet is 1180 +/-20 ℃, the section steel rolling production line rolls the billet, the rough rolling target temperature is 1080 ℃, the billet enters a finishing mill for multi-pass continuous rolling, the finishing rolling temperature is 900 +/-10 ℃, round steel with the diameter of 19mm is rolled, and the ovality and the surface quality of the rolled steel meet the strict requirements of users. In order to prevent the end face crack of the round steel during shearing, the shearing temperature is more than 750 ℃.
(2) The tensile strength of the steel is 1170-1265 MPa, the yield strength is 980-1100 MPa, and the elongation after fracture of the steel is 19-23%. The surface shrinkage of the steel is not less than 60%, and the impact power value of the steel is (AKV) 103-122J.
Production example: (1) smelting the components and properties of the finished product.
Refining by using a 70-ton direct-current electric arc furnace LF, continuously casting by using a 4-flow square billet continuous casting machine, producing 8 furnaces, producing 150mm multiplied by 10500 mm, and smelting finished product components [ S ] are less than or equal to 0.0035%, [ N ] are less than or equal to 0.004 omega%, and [ C ] are 0.31-0.32%; the specific components are shown in Table 1.
TABLE 1 sucker rod compositions and corresponding Properties produced according to the invention
The hydrogen content of the steel ladle molten steel is not more than 0.0001 percent.
(2) The strength and toughness of the steel produced by the method are 1210-1270 MPa, the yield strength is 1010-270 MPa, the yield ratio is 0.818-0.897, the surface shrinkage of the material is more than 60%, the elongation after fracture is 19.5-23%, the impact power is 103-122J, and the material has high strength and high toughness. The improvement of the fatigue life of the material is realized by improving the purity of the material and the uniformity of the structure. Metallographic detection, namely detecting by using an optical microscope, wherein the steel structure is ferrite, pearlite and a small amount of bainite under 500 times, the grain size of the steel is detected to be 11.5-12.5 grade under 100 times, and no banded structure is found in the steel detection; and (3) detecting nonmetallic inclusions, wherein the B-class fineness is less than or equal to 0.5 grade, the D-class fineness and the Ds-class are not more than 0.5 grade, the nitrogen content of the precipitated steel is 0.0031-0.0039%, and the total oxygen content is less than 0.0020%. The steel produced by the invention has the advantages that the annual usage amount of users is more than 5000 tons, no fatigue fracture accidents occur in the designed service life, and good economic benefits are obtained.
Detailed Description
A production method of high-strength anti-fatigue sucker rod steel,
1) and the process flow is as follows: molten iron desulfurization pretreatment → electric furnace smelting → tapping deoxidation alloying, carburetion and inclusion removal → ladle inert gas bottom blowing stirring → LF refining treatment → continuous casting → casting blank slow cooling → rolling;
2) and component design: c: 0.30-0.33%; si: 0.25-0.35%; mn: 0.95-1.10%; mo: 0.20-0.30%; p: less than or equal to 0.012 percent; s is less than or equal to 0.005 percent; ti: 0.045-0.055%; cr: 0.85-0.95%; al: 0.025-0.035%; cu is less than or equal to 0.10 percent; the content of [ Ni ] is less than or equal to 0.10 percent; [ N ]: less than or equal to 0.0045 percent, and the balance of iron and inevitable impurities;
3) and molten iron desulphurization pretreatment: the blast furnace molten iron station-entering temperature is 1320-,adding a slag thickener into the top slag of the hot-metal ladle: the main components of CaO and MgO account for 12 plus or minus 0.5 percent and AL2O3About 13% SiO260. + -. 2% of Na2O+K2The sum of O and the melting point is about 5 percent, the temperature of the soft melting point is less than or equal to 1200 ℃, the desulfurized slag is added to ensure that the desulfurized slag is reversely and dryly aggregated, the resulfurization of the molten iron is reduced, the removal of the top slag of the molten iron can after desulfurization is facilitated, and the S after the pretreatment of the molten iron]The content is not more than 0.001%; the addition amount of the slag thickener is 1kg per ton of iron, and the top slag of the hot-metal ladle is removed after treatment;
4) the method adopts electric furnace primary smelting, the quality requirements of the scrap steel are that the scrap steel is produced in fields such as carbon structural steel, low-alloy structural steel and cold rolled steel, the scrap steel accounts for 65-70% of metal materials, the mass of the molten iron is about 35-40%, the charging sequence is that the molten iron is firstly added into the furnace, then the scrap steel is added, finally the active lime is added, the activity degree of the lime is not more than 320ml, the electric furnace melts the scrap steel and the molten slag, the decarburization and the dephosphorization are carried out, the molten steel is prevented from being over oxidized, oxygen is blown in the whole smelting process, when the iron materials are melted and furnace burden is melted, the foam slag is adopted for submerged arc smelting, the oxygen pressure is adjusted according to the molten clean carbon in the electric furnace, simultaneously, the scientific and reasonable flow ratio of a furnace wall oxygen lance and a furnace door oxygen lance is utilized, the hit rate of the molten steel electric furnace end point carbon is improved, the target value of the electric furnace end point carbon is 0.04-0.08%, the phosphorus content of the electric furnace tapping is not more than 0.008% and the sulfur content is not more than 0.008%, steel is left in the electric furnace after the electric furnace tapping, and slag is strictly forbidden; adding lime at one time in the tapping process, sequentially adding carbon powder and calcium carbide, high-carbon ferrochrome and high-carbon ferromanganese, performing pre-deoxidation, recarburization and alloying, wherein the calcium carbide and the carbon powder are added when the tapping amount reaches 1/4 of the total amount, the calcium carbide and the carbon powder are completely added before tapping, simultaneously adding aluminum iron for deep deoxidation of molten steel, performing bottom argon blowing stirring on a ladle in the whole process of electric furnace tapping, determining the oxygen content in the molten steel of the ladle by using an oxygen determination instrument after tapping, feeding aluminum wire to supplement aluminum into the molten steel when the oxygen content in the molten steel is more than 50ppm, and controlling the aluminum content in the molten steel to be 0.030-0.050% after the bottom argon blowing stirring; slag washing during electric furnace tapping, adding 0.30kg of aluminum and iron per ton of steel in order to prevent nitrogen increase of molten steel during tapping, then adding 1kg/t fluorite and 3kg/t lime to adjust the content of slag components on the top of steel ladle, which is beneficial to desulfurization and removal of non-metallic inclusions, adding steel2.0kg/t of a ladle top slag modifier, and the modifier comprises the following main components in percentage by weight: CaO and Al2O3Premelting slag, SiO2The content of the aluminum is not more than 5 percent, the content of the aluminum is 25 to 30 percent, and the CaO and the Al are2O3The mass percentage of the pre-melted slag is as follows: CaO content about 45%, Al2O3About 40 percent of dolomite, about 10 percent of dolomite and about 5 percent of witherite, and the raw materials are fully mixed, sintered and melted. And LF refining steel ladle argon blowing strong stirring improves the steel ladle desulfurization and inclusion removal effect. The strong stirring time of the argon blowing at the bottom of the steel ladle is controlled to be 8 minutes. The production process includes pre-deoxidizing molten steel carbon-base alloy and material to reduce the impurity content in alumina, slag washing and top slag reforming to promote the floating of impurity in molten steel and the adsorption and removal of top slag.
5) In the LF refining method, a slag modifier is added to top slag of the LF refining 5-8 minutes after the initial refining stage, and the main components are SiC and CaC2、CaO、CaCO3Al plate mixture and SiO2Modifying the ladle top slag with the components of 50 percent of CaO and CaCO320% of SiC, 10% of CaC2The content of 10 percent and the Al content of 10 percent are added, 1.5kg of steel is added in the total ton, 1.0kg of steel is added in the initial stage of LF refining, 0.5kg of steel is added in 12 minutes of LF refining, the alkalinity and the viscosity of slag are adjusted, and foam slag is formed to prevent the molten steel from being oxidized by contacting with air; in order to prevent nitrogen increase of molten steel in the LF treatment process, ensure diffusion deoxidation, adsorption and impurity removal of reduced refining slag, the temperature rise time of the molten steel needs to be shortened, the temperature rise time of the molten steel in LF power transmission is not more than 15 minutes, the retention time of refining deoxidation and white slag is ensured to be more than 15 minutes, the good basis of the LF refining slag is judged to be that the total amount of ferrous oxide and manganese oxide in the slag is not more than 1.0 percent according to F, analysis and sampling are carried out, and when [ Al ] in the steel is subjected to [ Al ] analysis and sampling]The s content is less than 0.20 percent, aluminum is added in the refining process to ensure that [ Als ] in the steel before tapping]Between 0.020% and 0.030%; after LF treatment is finished, adding high-silicon ferrotitanium, wherein the content of titanium in the ferrotitanium is 30%, adding the ferrotitanium, stirring for 3 minutes by argon gas for calcium treatment, and then stirring for 8-12 min by argon gas under weak condition;
6) and LF refining treatment end point: the step is the main innovation point of the method, namely, a certain amount of free oxygen is required in the molten steel, and the total oxygen content is controlledWhen the LF is finished, carrying out calcium treatment at 0.0025-0.0035%, feeding calcium at the linear speed of 3.0-3.5 m/s, feeding calcium to rapidly combine with oxygen to form CaO molecules, and reacting CaO and Al2O3Combining to form large-particle low-melting-point aluminum and calcium oxide composite inclusion, floating and removing the inclusion by bottom blowing and stirring, wherein the calcium content in the molten steel is 0.0020-0.0035%, and then carrying out RH vacuum treatment, mainly dehydrogenation and denitrification, on the molten steel to ensure that the hydrogen content in the steel is not more than 1PPm, [ N ]]Less than or equal to 0.0040 percent, and other components meet the requirements of components of a smelted finished product;
7) and the continuous casting method comprises the following steps: the liquidus temperature of the molten steel of the steel grade is 1513 ℃, the control method of the internal quality of the casting blank, the square blank with the side length of 150mm of the continuous casting blank, the drawing speed is 1.3-1.60 m/min, the target value is 1.40 m/min, the superheat degree of the molten steel continuous casting is controlled to be 12-26 ℃, the target superheat degree is 15 ℃, the method for controlling the temperature drop of the molten steel in the continuous casting process is that the baking temperature of a steel ladle is more than 850 ℃, 300-400 kg of covering agent is added into a steel ladle of each furnace, the method adopted for preventing the secondary oxidation of the molten steel is that a middle ladle cover does not use a steel ladle cover, a refractory material ladle cover is required to be used, the service life of a middle ladle sizing water gap needs more than 6 hours, the sizing nozzle cannot be replaced in the continuous casting production process, in order to ensure the precision of finished carbon, a high-alkalinity low-carbon covering agent is adopted, the components are 60 percent of passivated lime powder with good spreading performance and 40 percent of wollastonite, and the thickness of the covering agent after melting is more than 40 millimeters; the method comprises the steps of adopting electromagnetic stirring and solidification tail end electromagnetic stirring dual stirring of a crystallizer, setting electromagnetic stirring frequency of the crystallizer to be 50HZ, current intensity to be 360A, solidification tail end frequency to be 50HZ, current intensity to be 320A, carrying out low-pulling-speed continuous casting, strictly prohibiting steel billet from generating central shrinkage cavity, carrying out hot acid cleaning on the steel billet, detecting central segregation to be not more than 0.5 level, slowly cooling the steel billet, keeping the temperature to be normal temperature, and carrying out furnace rolling after cold detection is qualified.
Claims (1)
1. The production method of the high-strength fatigue-resistant sucker rod steel is characterized by comprising the following steps of:
1) and the process flow is as follows: molten iron desulfurization pretreatment → electric furnace smelting → tapping deoxidation alloying, carburetion and inclusion removal → ladle inert gas bottom blowing stirring → LF refining treatment → continuous casting → casting blank slow cooling → rolling;
2) and component design: c: 0.30-0.33%; si: 0.25-0.35%; mn: 0.95-1.10%; mo: 0.20-0.30%; p: less than or equal to 0.012 percent; s is less than or equal to 0.005 percent; ti: 0.045-0.055%; cr: 0.85-0.95%; al: 0.025-0.035%; cu is less than or equal to 0.10 percent; the content of [ Ni ] is less than or equal to 0.10 percent; [ N ]: less than or equal to 0.0045 percent, and the balance of iron and inevitable impurities;
3) molten iron desulphurization pretreatment: the blast furnace molten iron station-entering temperature is 1320-: the main components of CaO and MgO account for 12 plus or minus 0.5 percent and AL2O3About 13% SiO260. + -. 2% of Na2O+K2About 5% of O, a softening point temperature of not more than 1200 ℃, and [ S ] after pretreatment of molten iron]The content is not more than 0.001%; the addition amount of the slag thickener is 1kg per ton of iron, and the top slag of the hot-metal ladle is removed after treatment;
4) the method comprises the steps of firstly smelting the scrap steel by using an electric furnace, wherein the quality requirements of the scrap steel comprise scrap steel of carbon structural steel, low-alloy structural steel and cut ends of cold rolled steel, the scrap steel accounts for 65-70% of metal materials, the mass of the molten iron is about 35-40%, molten iron is firstly added into the furnace, then the scrap steel is added, finally active lime is added, the activity degree of the lime is not more than 320ml, the target value of the end point carbon of the electric furnace is 0.04-0.08%, the phosphorus content of the electric furnace steel tapping is not more than 0.008% and the sulfur content is not more than 0.008%, lime is added at one time during the steel tapping process, carbon powder and calcium carbide are sequentially added, the calcium carbide and the carbon powder are added when the total amount of the steel tapping reaches 1/4, all the calcium carbide and the carbon powder are added before the steel tapping, aluminum iron are added for deep deoxidation of the molten steel, argon blowing and stirring are carried out on the bottom of a ladle during the whole process of the electric furnace steel tapping, an oxygen determination instrument is adopted to determine the oxygen content in the molten steel after the steel tapping, aluminum wire is added into the molten steel when the oxygen content in the molten steel is more than 50ppm, after bottom argon blowing stirring, determining the content of aluminum in molten steel and controlling the content to be 0.030-0.050%; slag washing during electric furnace tapping, adding 0.30kg of aluminum and iron per ton of steel in order to prevent nitrogen increase of molten steel during tapping, and then adding 1kg/t fluorite and 3kg/t fluoriteLime, 2.0kg/t of a ladle top slag modifier is added, and the modifier comprises the following main components in percentage by weight: CaO and Al2O3Premelting slag, SiO2The content is not more than 5%, the aluminum content is 25-30%, and the mass percentage content of the pre-melted slag is as follows: CaO content about 45%, Al2O3The content of dolomite is about 10 percent, the content of witherite is about 5 percent, the raw materials are fully mixed, sintered and melted, and the strong stirring time of argon blowing at the bottom of the steel ladle is controlled to be 8 minutes;
5) in the LF refining method, a slag modifier is added to LF refining top slag after 5-8 minutes in the initial refining stage, and the main components are SiC and CaC2、CaO、CaCO3Mixture of Al flakes and SiO2Inevitable impurities are not avoided, and the components comprise 50 percent of CaO and CaCO320% of SiC, 10% of CaC2The content is 10 percent, the Al content is 10 percent, the total adding amount is 1.5kg per ton of steel, and the adding amount at the initial stage of LF refining is as follows: 1.0kg of steel per ton, and the addition amount of the steel per ton in 12 minutes of LF refining is as follows: 0.5kg of steel per ton, adjusting the alkalinity and viscosity of slag to form foam slag and prevent molten steel from being oxidized, wherein the power transmission temperature rise time of the molten steel in LF is not more than 15 minutes, the refining deoxidation and white slag holding time is more than 15 minutes, the good foundation of LF refining slag is judged to be F, the total amount of ferrous oxide and manganese oxide in the slag is not more than 1.0 percent, analysis and sampling are carried out, and when [ Al in the steel is]The s content is less than 0.20 percent, aluminum is added in the refining process to ensure that [ Als ] in the steel before tapping]Between 0.020% and 0.030%; after LF treatment is finished, adding high-silicon ferrotitanium, wherein the content of titanium in the ferrotitanium is 30%, adding the ferrotitanium, stirring for 3 minutes by argon gas for calcium treatment, and then stirring for 8-12 min by argon gas under weak condition;
6) and LF refining treatment end point: a certain amount of free oxygen is required to be contained in molten steel, the total oxygen content is controlled to be 0.0025-0.0035%, calcium treatment is carried out after LF (ladle furnace) is finished, the linear speed of calcium feeding is 3.0-3.5 m/s, calcium wires are fed to rapidly combine with oxygen to form CaO molecules, and CaO and Al are combined2O3Combining to form composite inclusion, floating and removing the inclusion by bottom blowing and stirring, wherein the calcium content in the molten steel is 0.0020-0.0035%, and then carrying out RH vacuum treatment on the molten steel, mainly dehydrogenation and denitrification, so that the hydrogen content in the steel is not more than 1PPm and N]Less than or equal to 0.0040 percent, and other components according with the components of the smelted finished productSolving;
7) the continuous casting billet is a square billet with the side length of 150mm, the drawing speed is 1.3-1.60 m/min, the target value is 1.40 m/min, the superheat degree of molten steel continuous casting is controlled at 12-26 ℃, the target superheat degree is 15 ℃, the molten steel temperature drop in the continuous casting process is controlled by the method that the baking temperature of a steel ladle is more than 850 ℃, and 300-400 kg of covering agent is added into a steel ladle of each furnace, the method adopted for preventing secondary oxidation of the molten steel is that a steel ladle cover cannot be used as a tundish cover, a refractory material ladle cover must be used, the service life of a sizing tundish nozzle needs more than 6 hours, the sizing nozzle cannot be replaced in the continuous casting production process, a high-alkalinity low-carbon covering agent is adopted, the components are 60% of passivated lime powder with good spreading performance and 40% of wollastonite, and the thickness of the covering agent after melting is more than 40 mm; the method comprises the steps of adopting electromagnetic stirring and solidification tail end electromagnetic stirring dual stirring of a crystallizer, setting electromagnetic stirring frequency of the crystallizer to be 50HZ, current intensity to be 360A, solidification tail end frequency to be 50HZ, current intensity to be 320A, carrying out low-pulling-speed continuous casting, strictly prohibiting steel billet from generating central shrinkage cavity, carrying out hot acid cleaning on the steel billet, detecting central segregation to be not more than 0.5 level, slowly cooling the steel billet, keeping the temperature to be normal temperature, and carrying out furnace rolling after cold detection is qualified.
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