CN102936691A - Method for manufacturing oil casings made of R95-grade steel containing rare earth - Google Patents
Method for manufacturing oil casings made of R95-grade steel containing rare earth Download PDFInfo
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- CN102936691A CN102936691A CN2012104639852A CN201210463985A CN102936691A CN 102936691 A CN102936691 A CN 102936691A CN 2012104639852 A CN2012104639852 A CN 2012104639852A CN 201210463985 A CN201210463985 A CN 201210463985A CN 102936691 A CN102936691 A CN 102936691A
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Abstract
The invention relates to a method for manufacturing oil casings made of R95-grade steel containing rare earth. The method is characterized in that each casing blank comprises, by weight, from 0.24% to 0.30% of C, from 0.15% to 0.35% of Si, from 1.35% to 1.55% of Mn, lower than or equal to 0.020% of P, lower than or equal to 0.010% of S, from 0.30% to 0.40% of Cr, from 0.02% to 0.04% of Al, from 0.0007% to 0.0110% of rare earth elements RE and the balance Fe which is a matrix. A casing heat treatment regime includes that the temperature is 910 DEG C+/-20 DEG C and is kept for 50 minutes, and then water quenching is performed; and the tempering temperature is 630 DEG C+/-20 DEG C and is kept for 80 minutes, then air cooling production is carried out, and the steel casings with optional sizes can meet standard requirements. The method has the advantages that the 27Mn2CrRe steel containing carbon manganese steel and the rare earth is reasonable in material constitution design, and is low in cost due to the fact that materials for manufacturing the casings do not contain precious metal elements such as molybdenum; the water quenching and tempering are combined in a heat treatment process, and the water quenching does not affect environments and is low in cost, so that the plasticity of the steel is greatly improved on the premise that the strength of the obtained oil casings made of the R95-grade steel is guaranteed, the impact toughness of the steel casings is improved, and the steel casings are excellent in high-temperature mechanical property and can meet service requirements on oil casings under different working conditions.
Description
One, technical field:
The present invention relates to a kind of rare earth R95 steel level oil bushing production method that contains, belong to the ferrous metallurgy technical field.
Two, background technology:
API Spec 5CT standard has only been stipulated the upper limit of Partial Elements for the R95 steel level oil bushing, can own designing chemical composition, obtain the petroleum casing pipe that conformance with standard requires by the thermal treatment means.
Now a lot of steel mills adopt chromium manganese molybdenum steel kind more, owing to having added molybdenum, cost is higher, lacks competitiveness under present market condition.
Three, summary of the invention:
The purpose of this invention is to provide a kind of production method that contains rare earth R95 grade of steel (27Mn2CrRE steel grade) petroleum casing pipe.Method of the present invention adopts carbon manganese steel to add the rare earth steel grade, and rolling (thermal treatment process adopts shrend to add tempering by Overheating Treatment technique, shrend is on not impact of environment, cost is lower), obtain the R95 steel level oil bushing, under the prerequisite of proof strength, greatly improve the plasticity of steel, the impelling strength of steel pipe is improved, and mechanical behavior under high temperature is fine, can satisfy the service requirements of petroleum casing pipe under different operating modes.
The chemical composition of pipe of the present invention is by weight percentage: C 0.24-0.30; Si 0.15-0.35; Mn 1.35-1.55; P≤0.020; S≤0.010; Cr 0.30-0.40; Al 0.02-0.04; Rare earth elements RE 0.0007-0.0110; Surplus is matrix Fe;
The technological process of production summary that contains rare earth R95 steel level oil bushing of the present invention is:
Hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → round billet continuous casting → heating of pipe blank → perforation → Continuous Seamless Tube Mill → surely open tube reducing → cold bed → sawing → aligning → thermal treatment → flaw detection.
The heat treating regime of sleeve pipe is: shrend after the 910 ℃ ± 20 ℃+50min insulation; Air cooling production after 630 ℃ ± 20 ℃ tempering+80min insulations, the steel pipe of any specification all can satisfy standard-required.
Described rare earth element is Ce, La norium; Their weight percent is respectively: Ce 67%, La33%.
With the blast-melted of weight percent 90% and 10% steel scrap as raw material.Produce with following technical process: at first above-mentioned molten iron is carried out pre-treatment, then together adding top and bottom combined blown converter with above-mentioned steel scrap smelts, enter furnaceman LF position and carry out refining smelting the good molten steel ladle of packing into, carry out the VD station after refining is finished and carry out Fruit storage, carry out again round billet continuous casting, continuously cast billet for pipe-making is heated, the pipe that heats bored a hole make it become Continuous Seamless Tube Mill, tube rolling opened surely send into the cold bed cooling behind the tube reducing, then implement sawing, the sleeve pipe that cuts is heat-treated, then align, finally by carrying out flaw detection, eligible is finished product.
Details are as follows for its specific embodiment:
With blast-melted through pre-treatment, so that the S amount of containing (weight percent) in the molten iron is reduced to below 0.010%;
2. pretreated molten iron is blended into top and bottom combined blown converter, adds (weight percent) 10% steel scrap, adopt single slag technique to smelt, control finishing slag basicity and terminal point target: [C]
Tapping〉=0.06%; Point blows number of times≤1 time, carries out deoxidation alloying in the tapping process, and final deoxygenation adopts aluminium deoxidation technique, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds;
3. carry out concise at the LF stove: the refining whole process is normal Argon on request, adopts from rudimentary and counts to the mode that senior number improves heat-up rate gradually and heat temperature raising; Carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature; The white slag operation is made in employing;
4.LF keep soft blow Ar in bottom after the stove refining finishes, press material mixture ratio add-on feeding rare-earth wires.
5. carry out VD vacuum-treat: vacuum tightness≤0.10Kpa, dark vacuum time 〉=13 minutes;
6. feeding fixed length silico-calcium silk carries out blowing in 8--10 minute Ar behind hello the silk.To carry out round billet continuous casting through the molten steel after the VD vacuum-treat, adopt low pulling rate, the control of permanent pulling rate and induction stirring technique; The control molten steel overheat; Strand is cut into circular pipe blank through after aligning.
To being up to the standards and sufur printing is not more than 2.0 grades strand and carries out tubulation, the chemical composition of its blank tube material is as follows:
Be by weight percentage: C 0.24-0.30; Si 0.15-0.35; Mn 1.35-1.55; P≤0.020; S≤0.010; Cr 0.30-0.40; Al 0.02-0.04; Rare earth elements RE 0.0007-0.0110; Surplus is matrix Fe.
Described rare earth element is Ce, La norium; Their weight percent is respectively: Ce 67%, La33%.
The tubulation process is as follows;
The temperature of each sections such as continuous review preheating section, heating zone, soaking zone, the control of each section of ring furnace temperature sees the following form 1;
Each section of table 1 rotary heating furnace temperature
Each section of computer system online record Heating temperature requires to control well preheating section, soaking zone temperature, guarantees thoroughly evenly and not burning of heating.Hot tool must be measured before use, rolls front inspection processing roller-way and avoids scratching.The pipe that heats is rolled into weldless steel tube in φ 180mmMPM continuous rolling-tube unit, and every batch is carried out once the heat geometrical dimension of taking a sample to check at least.
Through above-mentioned technological process, can produce the rare earth R95 steel level oil bushing (27Mn2CrRE steel grade) that contains of the present invention and roll the attitude steel pipe, heat treating method is seen embodiment.
Advantage of the present invention is: the present invention adopts carbon manganese steel to add the 27Mn2CrRE steel grade of rare earth, material composition is reasonable in design, do not contain the precious metal elements such as molybdenum in the material of sleeve pipe, cost is low, thermal treatment process adopts shrend to add tempering, shrend is on not impact of environment, cost is lower, obtain the R95 steel level oil bushing, under the prerequisite of proof strength, greatly improved the plasticity of steel, the impelling strength of steel pipe is improved, and mechanical behavior under high temperature is fine, can satisfy the service requirements of petroleum casing pipe under different operating modes.
Four, embodiment:
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
1. smelting test parameter
Following table 2-5 is respectively chemical composition, gas content, five-harmful elements control and the continuous casting circular tube blank sulfur print test result of smelting, and is fine to the smelting control of steel as can be known by result in the table, created good material condition for going to the factory further to produce.
Table 2 gas content
| ? | H | O | N |
| Maximum value | 1.55 | 28 | 48 |
| Minimum value | 0.38 | 14 | 36 |
| Mean value | 1.02 | 19 | 40 |
Table 3 body chemical composition
| ? | C | Si | Mn | P | S | Cr | Al |
| Maximum value | 0.30 | 0.34 | 1.54 | 0.019 | 0.008 | 0.38 | 0.038 |
| Minimum value | 0.25 | 0.23 | 1.37 | 0.012 | 0.002 | 0.30 | 0.020 |
| Mean value | 0.27 | 0.28 | 1.42 | 0.016 | 0.005 | 0.33 | 0.025 |
[0036]Table 4 five-harmful elements
| ? | As | Sn | Pb | Sb | Bi |
| Maximum value | 0.004 | 0.006 | 0.002 | 0.002 | 0.001 |
| Minimum value | 0.002 | 0.004 | 0.001 | 0.001 | 0.001 |
| Mean value | 0.003 | 0.005 | 0.0015 | 0.0015 | 0.001 |
Table 5 sufur printing result
| ? | Centre burst | Middle crack | Subcrack | Inclusion |
| 0 grade | 15 | 15 | 15 | 15 |
| 1 grade | 5 | 0 | 0 | 0 |
| 2 grades | 0 | 0 | 0 | 0 |
2. laboratory heat treatment test and heat treating regime draw
2.1 laboratory heat treatment test
Heat-obtaining rolls the weldless steel tube sample and makes the blank material, heat-treat simulation test at the intermediate frequency heat treatment test furnace, get according to the CCT parameter of curve that quenching temperature is constant to be set as 900 ℃, tempering temperature from 560 with 20 interval variation to 640, obtain the performance perameter of table 6, the result rejects insincere numerical value according to the production first time, replenish and do heat treating regime such as table 7,590 ℃, 610 ℃, 630 ℃ temperature schedules have been increased, table 8 is the ballistic work result, the plasticity of steel is fine behind the interpolation rare earth, and ballistic work numerical value is higher.
Table 6 laboratory heat treatment test results of property
Table 7 laboratory supplemental heat Processing Test results of property
Table 8 laboratory thermal treatment ballistic work result
2.2 heat treating regime draws
Providing the industrial production heat treating regime according to laboratory results is: shrend after the 910 ℃ ± 20 ℃+50min insulation; 630 ℃ ± 20 ℃ tempering+80min insulations, air cooling.
3. commerical test
Adopt the laboratory system to carry out commerical test, process φ 244.5 * 11.99mm steel pipe, mechanical performance data sees Table 9, the ballistic work test temperature is 0 ℃, and specimen size is 7.5 х, 10 х 55mm, and data see Table 9, shearing area rate data satisfy the requirement of API Spec 5CT standard P LS-2 such as table.
Table 9 industrial production performance perameter
Claims (3)
1. one kind contains rare earth R95 steel level oil bushing production method, and it is characterized in that: the chemical composition of pipe is by weight percentage: C 0.24-0.30; Si 0.15-0.35; Mn 1.35-1.55; P≤0.020; S≤0.010; Cr 0.30-0.40; Al 0.02-0.04; Rare earth elements RE 0.0007-0.0110; Surplus is matrix Fe; The technological process of production of sleeve pipe is: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → round billet continuous casting → heating of pipe blank → perforation → Continuous Seamless Tube Mill → surely open tube reducing → cold bed → sawing → aligning → thermal treatment → flaw detection; The heat treating regime of sleeve pipe is: shrend after the 910 ℃ ± 20 ℃+50min insulation; Air cooling production after 630 ℃ ± 20 ℃ tempering+80min insulations, the steel pipe of any specification all can satisfy standard-required.
2. the rare earth R95 steel level oil bushing production method that contains according to claim 1, it is characterized in that: described rare earth element is Ce, La norium; Their weight percent is respectively: Ce 67%, La33%.
3. the rare earth R95 steel level oil bushing production method that contains according to claim 1 and 2 is characterized in that: described pipe is made as raw material with the blast-melted of weight percent 90% and 10% steel scrap.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103215518A (en) * | 2013-05-14 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for rare-earth-containing H2S corrosion-resistant pipeline, and production method thereof |
| CN103215517A (en) * | 2013-04-24 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel pipe for rare-earth-containing humidity-resistant and H2S corrosion resistant L485QS pipeline and production method thereof |
| CN103602904A (en) * | 2013-04-24 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Rare earth containing low-cost seamless steel pipe for L415N pipeline and production method thereof |
| CN103978062A (en) * | 2014-05-28 | 2014-08-13 | 江苏三耐特钢有限公司 | Tube drawing process of rare-earth wear-resistant steel |
| CN104109813A (en) * | 2014-07-03 | 2014-10-22 | 西南石油大学 | Dual-phase steel for high-expansion-ratio expansion pipes with high oil-gas field produced water corrosion resistance and preparation method thereof |
| CN104651723A (en) * | 2015-02-27 | 2015-05-27 | 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 |
| CN108374121A (en) * | 2018-03-21 | 2018-08-07 | 包头钢铁（集团）有限责任公司 | One kind C110 containing rare earth steel level oil bushings and its production method |
| CN113652603A (en) * | 2021-07-07 | 2021-11-16 | 包头钢铁（集团）有限责任公司 | Rare earth-containing 750 MPa-grade seamless steel tube for engineering machinery and production method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103215517A (en) * | 2013-04-24 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel pipe for rare-earth-containing humidity-resistant and H2S corrosion resistant L485QS pipeline and production method thereof |
| CN103602904A (en) * | 2013-04-24 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Rare earth containing low-cost seamless steel pipe for L415N pipeline and production method thereof |
| CN103215518A (en) * | 2013-05-14 | 2013-07-24 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube material for rare-earth-containing H2S corrosion-resistant pipeline, and production method thereof |
| CN103215518B (en) * | 2013-05-14 | 2016-04-20 | 内蒙古包钢钢联股份有限公司 | Containing the resistance to H of rare earth 2the preparation method of S corroded pipeline weldless steel tube |
| CN103978062A (en) * | 2014-05-28 | 2014-08-13 | 江苏三耐特钢有限公司 | Tube drawing process of rare-earth wear-resistant steel |
| CN104109813A (en) * | 2014-07-03 | 2014-10-22 | 西南石油大学 | Dual-phase steel for high-expansion-ratio expansion pipes with high oil-gas field produced water corrosion resistance and preparation method thereof |
| CN104651723A (en) * | 2015-02-27 | 2015-05-27 | 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 |
| 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 |
| CN108374121A (en) * | 2018-03-21 | 2018-08-07 | 包头钢铁（集团）有限责任公司 | One kind C110 containing rare earth steel level oil bushings and its production method |
| CN113652603A (en) * | 2021-07-07 | 2021-11-16 | 包头钢铁（集团）有限责任公司 | Rare earth-containing 750 MPa-grade seamless steel tube for engineering machinery and production method thereof |
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Application publication date: 20130220 |