CN108374121B - Rare earth-containing C110 steel-grade petroleum casing pipe and production method thereof - Google Patents
Rare earth-containing C110 steel-grade petroleum casing pipe and production method thereof Download PDFInfo
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- CN108374121B CN108374121B CN201810236961.0A CN201810236961A CN108374121B CN 108374121 B CN108374121 B CN 108374121B CN 201810236961 A CN201810236961 A CN 201810236961A CN 108374121 B CN108374121 B CN 108374121B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a rare earth-containing C110 steel-grade petroleum casing pipe, which comprises the following components in percentage by weight: 0.27 to 0.30 percent of C; 0.15 to 0.30 percent of Si; 0.35 to 0.50 percent of Mn; 1.35 to 1.45 percent of Cr; mo0.60-0.70%; v0.02-0.04%; ni 0.10-0.20%; 0.02-0.05% of Al; re 0.02%; p is less than or equal to 0.020%; s is less than or equal to 0.005 percent. The invention also discloses a production method of the petroleum casing pipe. According to the petroleum casing pipe and the production method thereof, the obtained petroleum casing pipe has uniform internal structure and no chemical composition segregation, and the SSC resistance of the petroleum casing pipe is improved; the obtained petroleum casing pipe has good quality, prolongs the service life, increases the safety of pipeline transportation and is beneficial to meeting the requirements of social development.
Description
Technical Field
The invention relates to the technical field of metallurgical steel pipes, in particular to a rare earth-containing C110 steel-grade petroleum casing pipe and a production method thereof.
Background
With the continuous and rapid development of society, the demand for energy sources such as petroleum and natural gas is increasing, and the continuous increase, structural adjustment and optimization of the energy source demand drive the overall development of the petroleum and natural gas industry. Transportation of petroleum is commonly carried out by pipeline. The pipeline transportation is an economic, safe and uninterrupted transportation mode and has the advantages of large transportation capacity, low cost, high safety, convenience, high efficiency and the like. To meet future oil and gas demand, H is contained2The development quantity of S oil and gas fields is greatly increased compared with the past, and meanwhile, the demand of acid service pipeline steel is increased. H2S is one of the most corrosive harmful media in oil and natural gas, and the transmission pipeline is exposed to the wet H2In a fluid medium of S, H is likely to occur2The acidic corrosion of S causes the thinning, hole erosion and even breakage of the pipe wall, and seriously affects the service life and safe operation of the pipeline. Hydrogen Induced Cracking (HIC) and Sulfide Stress Corrosion Cracking (SSCC) is H2S main form of acidic corrosion. Therefore, there is an urgent need for optimizing and developing a novel acid corrosion resistant petroleum casing, improving the pipeline transportation quality, and prolonging the service life of the casing in pipeline transportation.
Accordingly, those skilled in the art have been devoted to developing a rare earth-containing C110 steel grade petroleum casing and a method for producing the same.
Disclosure of Invention
In view of the above defects in the prior art, the technical problems to be solved by the invention are that the petroleum casing pipe in the prior art has low hydrogen sulfide corrosion resistance and short service life.
In order to achieve the above object, the invention provides a rare earth-containing C110 steel grade petroleum casing pipe in a first aspect, which comprises the following components in percentage by weight: 0.27 to 0.30 percent of C; 0.15 to 0.30 percent of Si; 0.35 to 0.50 percent of Mn; 1.35 to 1.45 percent of Cr; mo 0.60-0.70%; v0.02-0.04%; ni 0.10-0.20%; 0.02-0.05% of Al; re 0.02%; p is less than or equal to 0.020%; s is less than or equal to 0.005 percent.
Further, the oil casing has a H: 0.6ppm, O: 17ppm, N: 74 ppm.
In a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing comprises 0.29% by weight of C;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises Si in an amount of 0.25 wt%;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises Mn in an amount of 0.43% by weight;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises 1.37 wt% of Cr;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises 0.64% by weight of Mo;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing comprises 0.02% by weight of V;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises 0.12% by weight of Ni;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing pipe comprises 0.039% by weight of Al;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing comprises 0.009% by weight P;
in a preferred embodiment of the invention, the rare earth-containing C110 steel grade petroleum casing comprises 0.003% by weight of S;
the invention provides a production method of a rare earth-containing C110 steel-grade petroleum casing pipe, which comprises the following specific steps:
step 1, pretreating molten iron;
step 2, smelting in a converter;
step 3, refining in an LF furnace;
step 4, VD vacuum degassing;
step 5, continuous casting of round billets;
step 6, slowly cooling the round billet;
step 7, heating and rolling the tube blank;
and 8, carrying out heat treatment.
Further, in the step 1, the sulfur content of the molten iron after the molten iron pretreatment is less than or equal to 0.05%; the phosphorus content is less than or equal to 0.120 percent;
further, in the step 2, converter smelting adopts a single slag process, and the alkalinity of final slag is 3.2; silicon-manganese, ferromanganese and ferrochromium are adopted for deoxidation alloying, and an aluminum deoxidation process is adopted for final deoxidation; adding a proper amount of white ash blocks in the tapping process;
further, in the step 3, when the LF furnace is used for refining, argon is normally blown in the whole refining process; a mode of gradually increasing the temperature rising speed from a low level to a high level is adopted; carrying out slagging desulfurization, component adjustment and heating operation according to the components and the temperature of the molten steel of the converter; after the refining of the LF furnace is finished, keeping the bottom to be blown with argon softly, and feeding a proper amount of rare earth wires according to the addition of 0.02 percent;
further, in the step 4, when VD is subjected to vacuum degassing, the vacuum degree is less than or equal to 0.10KPa, and the target value is less than or equal to 0.07 KPa; the deep vacuum time is more than or equal to 15 minutes, and a 250m calcium silicate wire is fed after vacuum; the soft blowing time after the wire feeding is more than or equal to 15 minutes;
further, in the step 5, the round billet continuous casting adopts an electromagnetic stirring process; superheat degree of molten steel: delta T is less than or equal to 30 ℃, and the liquidus temperature of the steel grade is TL-1507 ℃; the low pulling speed is adopted in the initial pouring stage, and the constant pulling speed is adopted for stable pouring;
further, the pulling speed of the constant pulling speed is 1.12 m/min;
further, in the step 6, the pit discharging temperature of the circular blank in slow cooling is less than or equal to 200 ℃;
further, in the step 7, the heating and rolling of the tube blank comprises six sections, wherein the first section heating temperature is 800-1050 ℃; the second-stage heating temperature is 1000-1150 ℃; the heating temperature of the three sections is 1250-1290 ℃; the four-stage heating temperature is 1240-1300 ℃; the heating temperature of the five sections is 1240-1280 ℃; the six-section heating temperature is 1280-1300 ℃;
further, in the step 8, the tempering temperature of the heat treatment is more than 649 ℃;
in a preferred embodiment of the present invention, in the step 4, the vacuum degree of VD is 0.01KPa during vacuum degassing;
in a preferred embodiment of the invention, in the step 6, the pit-out temperature of the slow cooling of the round billet is less than or equal to 102 ℃; (ii) a
In a preferred embodiment of the invention, in the step 7, the heating temperature of the section for heating and rolling the tube blank is 870 ℃; the second-stage heating temperature is 112 ℃; the heating temperature of the three sections is 1258 ℃; the four-stage heating temperature is 1283 ℃; the heating temperature of the five sections is 1262 ℃; the six-section heating temperature is 1286 ℃;
in a preferred embodiment of the present invention, in the step 8, the specific operation of the heat treatment is: heating at 890 +/-10 ℃ for 50min, water quenching, tempering at 700 +/-10 ℃ for 70min, and air cooling;
by adopting the scheme, the rare earth-containing C110 steel-grade petroleum casing pipe and the production method thereof disclosed by the invention have the following technical effects:
(1) the rare earth-containing C110 steel-grade petroleum casing pipe adopts a deep-drawing S, P molten iron converter oxygen blowing steelmaking and proper ladle refining and vacuum degassing processes to keep the ultralow P, S content and reduce the contents of gases such as [ N ], [ H ] and [ O ]; by adopting the steel ladle electromagnetic stirring and steel ladle argon blowing processes, the alloy homogenization and the full floating of non-metallic inclusions are promoted, the content of the non-metallic inclusions is reduced, and the purity of molten steel is improved; the wire feeding calcium treatment process is adopted to spheroidize the residual non-metallic inclusions, particularly manganese sulfide, in the steel, so that the internal structure is uniform, the chemical components are not segregated, and the SSC resistance of the petroleum casing pipe is improved;
(2) according to the rare earth-containing C110 steel-grade petroleum casing pipe, the bulging amount of a continuous casting billet is controlled, the pouring temperature and the withdrawal speed are controlled, and the technologies of electromagnetic stirring, light pressing and the like are adopted, so that the center segregation and the center porosity are obviously reduced, and the quality of a continuous casting billet is improved and the continuous casting billet is more isotropic. The combination of continuous casting, improving the purity of molten steel and controlling the form of inclusions reduces the elongation tendency of tissues during hot processing, minimizes the anisotropy of materials and obviously improves the SSC resistance of steel. (ii) a
(3) According to the rare earth-containing C110 steel-grade petroleum casing pipe, a stepping heating furnace system which is provided with a Programmable Logic Controller (PLC) and monitored by a computer is adopted for heat treatment, so that the temperature control and soaking treatment capacity are facilitated, the set temperature of an austenitizing high-temperature area can be reduced to the lowest, and the condition that the grain size is not increased within a long time when the temperature of a full-wall thick area is equalized is ensured; by adopting an optimized water quenching system, the flow rate of the layer and the moving speed of the steel pipe passing through each section of the layer flow are adjusted by sections through a computer, so that the uneven cooling along the length direction of the steel pipe caused by the axial injection in the steel pipe is compensated. The steel pipe rotation, the outer pipe laminar flow and the inner pipe axial injection system control the water flow, the pressure and the steel pipe rotation moving speed through a computer, so that the thick-wall coupling blank pipe comprises an inner wall surface (in H)2The initial position of hydrogen diffusion in the S environment) and simultaneously transforming the full-wall-thickness material into a martensite microstructure; the optimized tempering mode is adopted, so that the structure is converted into uniform tempered sorbite, and the hydrogen sulfide corrosion resistance of the steel pipe is greatly improved. (ii) a
In conclusion, the rare earth-containing C110 steel grade petroleum casing pipe and the production method thereof optimize production conditions and parameters, the obtained petroleum casing pipe has uniform internal structure and no chemical composition segregation, and the SSC resistance of the petroleum casing pipe is improved; the production efficiency of the petroleum casing is improved, and the energy consumption and production cost are reduced; the obtained rare earth-containing C110 steel-grade petroleum casing pipe has good quality, prolongs the service life, increases the safety of pipeline transportation and is beneficial to meeting the requirements of social development.
The conception, specific structure, and technical effects of the present invention will be further described in conjunction with the following embodiments to fully understand the objects, features, and effects of the present invention.
Detailed Description
The following describes preferred embodiments of the present invention to make the technical contents thereof clearer and easier to understand. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
Example preparation of rare earth-containing C110 Steel grade Petroleum casing
Adopting the desulfurized molten iron meeting the requirements, wherein the molten iron requirements are as follows: p is less than or equal to 0.120 percent, S is less than or equal to 0.050 percent, and the quality of all alloys and raw materials must meet the standard requirements;
smelting by adopting a single slag process, wherein the alkalinity of final slag is controlled according to 3.2; silicon-manganese, ferromanganese and ferrochromium are adopted for deoxidation alloying, and an aluminum deoxidation process is adopted for final deoxidation; slag is required to be removed during tapping, and slag is required to be removed during slag removal failure; adding a proper amount of white ash blocks (after the alloy is added) in the tapping process;
if necessary, slag removing treatment is carried out on the molten steel, and argon is blown normally according to requirements in the whole refining process; a mode of gradually increasing the temperature rising speed from a low level to a high level is adopted; carrying out slagging desulfurization, component adjustment and heating operation according to the components and the temperature of the molten steel of the converter; white slag is manufactured in refining. After the refining of the LF furnace is finished, keeping the bottom to be subjected to soft blowing of Ar, and feeding a proper amount of rare earth wires according to the addition amount of 0.02 percent;
the deep vacuum degree is 0.01Kpa, and the soft blowing time is 15min after vacuum; controlling the superheat degree of continuous casting of the round billet to be less than 30 ℃, controlling secondary cooling water, and controlling the drawing speed to be 1.12 m/min; carrying out slow cooling treatment on the round billet, wherein the final slow cooling temperature is less than 102 ℃;
the rolling specifications are 139.7 mm phi and 9.17mm phi, 153.7 mm phi and 14mm phi, the dimensional accuracy is qualified after rolling, the rolling temperature is controlled according to the table 1, and the specification of the tube blank is 210 mm;
TABLE 1
| Heating one section | Heating two stage | Heating three stages | Four stages of heating | Five stages of heating | Six sections of heating | |
| Control range | 800～1050 | 1000～1150 | 1250～1290 | 1240～1300 | 1240～1280 | 1280～1300 |
| Measured in fact | 870 | 1125 | 1258 | 1283 | 1262 | 1286 |
And the heat treatment temperature system is 890 +/-10 ℃ plus 50min of heat preservation water quenching, 700 +/-10 ℃ tempering plus 70min of heat preservation and air cooling to obtain the rare earth-containing C110 steel grade petroleum casing pipe.
Mechanical property detection is carried out on the petroleum casing pipe obtained in the embodiment, and the tensile strength is 854-936; the yield strength is 762-823; the elongation is 24-30;
the petroleum casing obtained in the embodiment is subjected to plasticity detection, and the result is shown in table 2, which shows that the percentage of the shearing area is 98-100 and the plasticity is good;
TABLE 2
| Size of sample | Shape of notch | Direction of sample | Test temperature | Percent area sheared | Impact value | |
| φ139.7×9.17mm | 7.5*10*55 | V-shape | Longitudinal direction | 0℃ | 100-100 | 126-143 |
| φ153.7×14mm | 5*10*55 | V-shape | Transverse direction | 0℃ | 98-100 | 57-74 |
The hardness of the petroleum casing pipe obtained in the embodiment is detected, and the result is shown in table 3, all indexes meet the requirements of the APISpec 5CT standard, and the petroleum casing pipe has good hardness performance;
TABLE 3
| Maximum value | Minimum value | Variance of the mean | |
| φ139.7×9.17mm | 26.4 | 23.6 | 2.8 |
| φ153.7×14mm | 24.1 | 20.4 | 3.7 |
The petroleum casing pipe obtained by the embodiment is subjected to a hydrogen sulfide resistance test, and the result shows that the petroleum casing pipe is intact and has no fracture after 720 hours and meets the standard requirement;
the chemical components of the petroleum casing pipe obtained in the embodiment are as follows by inspection: c: 0.29 percent; si: 0.25 percent; mn: 0.43 percent; p: 0.009%; s: 0.003%; v: 0.02 percent; cr: 1.37 percent; mo: 0.64 percent; ni: 0.12 percent; al: 0.039% and the balance of Fe and inevitable impurities;
through detection, the gas content of the petroleum casing obtained in the embodiment is as follows: h: 0.6 percent; o: 17 percent; n: 74 percent;
other technical schemes of the invention also have similar using effects.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (1)
1. The production method of the rare earth-containing C110 steel-grade petroleum casing is characterized by comprising the following specific steps of:
step 1, pretreating molten iron;
step 2, smelting in a converter;
step 3, refining in an LF furnace;
step 4, VD vacuum degassing;
step 5, continuous casting of round billets;
step 6, slowly cooling the round billet;
step 7, heating and rolling the tube blank;
step 8, heat treatment;
wherein the content of the first and second substances,
in the step 1, the sulfur content of the molten iron after the molten iron pretreatment is less than or equal to 0.05 percent; the phosphorus content is less than or equal to 0.120 percent;
in the step 2, when the converter is smelted, the converter smelting adopts a single slag process, and the alkalinity of final slag is 3.2;
in the step 3, when the LF furnace is used for refining, argon is blown normally in the whole refining process; a mode of gradually increasing the temperature rising speed from a low level to a high level is adopted; carrying out slagging desulfurization, component adjustment and heating operation according to the components and the temperature of the molten steel of the converter; after the refining of the LF furnace is finished, keeping the bottom to be blown with argon softly, and feeding rare earth wires according to the addition of 0.02 percent;
in the step 4, when VD is subjected to vacuum degassing, the vacuum degree is less than or equal to 0.10KPa, and the target value is less than or equal to 0.07 KPa; the deep vacuum time is more than or equal to 15 minutes, and a 250m calcium silicate wire is fed after vacuum; the soft blowing time after the wire feeding is more than or equal to 15 minutes;
in the step 5, the round billet continuous casting adopts an electromagnetic stirring process; superheat degree of molten steel: delta T is less than or equal to 30 ℃, and the liquidus temperature of the steel grade is TL-1507 ℃; the low pulling speed is adopted in the initial pouring stage, and the constant pulling speed is adopted for stable pouring; the drawing speed of the constant drawing speed is 1.12 m/min;
in the step 6, the pit discharging temperature of the slow cooling of the round billet is less than or equal to 200 ℃;
in the step 7, the heating and rolling of the tube blank comprises six sections, wherein the heating temperature of the first section is 800-1050 ℃; the second-stage heating temperature is 1000-1150 ℃; the heating temperature of the three sections is 1250-1290 ℃; the four-stage heating temperature is 1240-1300 ℃; the heating temperature of the five sections is 1240-1280 ℃; the six-section heating temperature is 1280-1300 ℃;
in the step 8, the tempering temperature of the heat treatment is more than 649 ℃;
the petroleum casing comprises the following components in percentage by weight: c: 0.29 percent; si: 0.25 percent; mn: 0.43 percent; p: 0.009%; s: 0.003%; v: 0.02 percent; cr: 1.37 percent; mo: 0.64 percent; ni: 0.12 percent; al: 0.039%, H: 0.6 ppm; o: 17 ppm; n: 74 ppm; the balance of Fe and inevitable impurities.
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| CN109440018A (en) * | 2018-11-21 | 2019-03-08 | 包头钢铁（集团）有限责任公司 | A kind of low cost oil casing pipe steel and preparation method thereof |
| CN109930081B (en) * | 2019-03-15 | 2020-12-22 | 包头钢铁（集团）有限责任公司 | Petroleum casing pipe and preparation method thereof |
| CN110629103B (en) * | 2019-10-22 | 2023-12-05 | 山东钢铁集团有限公司 | Production method of vacuum degassing rare earth steel and device used by same |
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| CN102534388A (en) * | 2011-12-07 | 2012-07-04 | 内蒙古包钢钢联股份有限公司 | Rare earth containing H2S-corrosion resistance petroleum casing pipe and production method thereof |
| CN102936691A (en) * | 2012-11-16 | 2013-02-20 | 内蒙古包钢钢联股份有限公司 | Method for manufacturing oil casings made of R95-grade steel containing rare earth |
| CN103194697A (en) * | 2013-04-12 | 2013-07-10 | 内蒙古包钢钢联股份有限公司 | Special H2S corrosion-resistant sleeve for heavy oil thermal recovery well, and production method |
| CN103436787B (en) * | 2013-08-23 | 2015-11-18 | 内蒙古包钢钢联股份有限公司 | Low cost is containing the anti-H of rare earth 2s corrodes the production method of petroleum casing pipe |
| CN103469085A (en) * | 2013-09-10 | 2013-12-25 | 内蒙古包钢钢联股份有限公司 | Rare earth (RE)-containing special petroleum casing for heavy oil thermal recovery wells and production method thereof |
| CN104651723B (en) * | 2015-02-27 | 2017-05-10 | 内蒙古包钢钢联股份有限公司 | Rare earth contained oil casing with high hydrogen sulfide corrosion resistance and collapse resistance, and production method of oil casing |
| CN104630643A (en) * | 2015-02-27 | 2015-05-20 | 内蒙古包钢钢联股份有限公司 | Rare earth-containing low-cost high collapse-resisting petroleum casing pipe and production method thereof |
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| JPH05247606A (en) * | 1992-03-03 | 1993-09-24 | Fuji Oozx Kk | Sintered alloy for valve seat of internal combustion engine and manufacture of valve seat using same alloy |
| JP2007262441A (en) * | 2006-03-27 | 2007-10-11 | Jfe Steel Kk | Steel for crude oil tank and its production method |
| CN101446180A (en) * | 2008-11-06 | 2009-06-03 | 天津钢铁有限公司 | Round blank for high-steel level oil bushing and manufacturing process |
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