CN103343296A - Rare earth containing seamless steel pipe used for hydraulic support and production method thereof - Google Patents
Rare earth containing seamless steel pipe used for hydraulic support and production method thereof Download PDFInfo
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- CN103343296A CN103343296A CN2013101679246A CN201310167924A CN103343296A CN 103343296 A CN103343296 A CN 103343296A CN 2013101679246 A CN2013101679246 A CN 2013101679246A CN 201310167924 A CN201310167924 A CN 201310167924A CN 103343296 A CN103343296 A CN 103343296A
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- rare earth
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- weldless steel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a rare earth containing seamless steel pipe used for a hydraulic support and a production method thereof, belonging to the technical field of metallurgy and molding. The seamless steel pipe comprises the raw materials by weight percent: 90 % of blast furnace molten iron and 10 % of high-quality scrap steel. A pipe blank comprises the following chemical components by weight percent: 0.15-0.20 of C, 0.20-0.50 of Si, 1.40-1.70 of Mn, less than or equal to 0.020 of P, less than or equal to 0.010 of S, 0.40-0.70 of Cr, 0.20-0.50 of Ni, 0.06-0.20 of V, 0.0005-0.0020 of B, 0.01-0.03 of Ti, 0.01-0.04 of Al, 0.0005-0.0100 of rare earth element RE, and the balance being Fe and undetectable trace elements. A technology proves comprises steps of pretreatment of molten iron, combined blown converter smelting, LF furnace refine, VD vacuum treatment, round ingot continuous casting, cutting, pipe blank heating, perforation, pipe rolling, sizing, cooling, sawing, heat treatment, straightening and flaw detection. Mechanical properties comprises a yield strength of 1000-1100 MPa, a tensile strength of 1150-1250 MPa, a yield ratio of less than or equal to 0.90, an elongation percentage of more than or equal to 17 %, a transverse impact value aKV of more than or equal to 100 J/cm<2>(0 DEG C), and a residual stress of less than or equal to 50 MPa. The product provided by the invention has characteristics of small residual stress, high intensity, good toughness and excellent welding performance.
Description
One, affiliated technical field:
The invention belongs to ferrous metal smelting and stress metal manufacture field, relate to a kind of high-strength and high ductility hydraulic support weldless steel tube and production method thereof that contains rare earth.
Two, background technology:
The hydraulic support weldless steel tube is hydraulic prop and the used important materials of mining bracket major parts of mechanical mining coal, requires weldless steel tube to have characteristics such as intensity height, good toughness, welding property be good, with security and the reliability that guarantees to use.The operating pressure of hydraulic prop is big, and the working face mining height is progressively being increased, this just proposes higher requirement to the intensity of support, and no matter traditional 27SiMn is from intensity, toughness, still welding property all can not satisfy user's service requirements, has developed the hydraulic support weldless steel tube of high-strength and high ductility both at home and abroad in succession.
By retrieval, Chinese invention patent " wall thickness is the high-intensity hydraulic support pipe of 60-70mm " (number of patent application: 200910068674.4), it exists following problem and shortcoming:
Chemical composition limit is too wide, and the thermal treatment process of employing is indeterminate, and every performance index are also indeterminate, and operability is not strong.
Three, summary of the invention:
The purpose of this invention is to provide that a kind of unrelieved stress is low, intensity is high, good toughness, the hydraulic support weldless steel tube and the production method thereof that contain rare earth that welding property is good.
The object of the present invention is achieved like this:
With the blast-melted of weight percent 90% and 10% high-quality steel scrap as raw material.
Produce with following technical process: at first to the above-mentioned blast-melted pre-treatment of carrying out, together adding top and bottom combined blown converter with above-mentioned high-quality steel scrap then smelts, to smelt the good molten steel ladle of packing into again enters furnaceman LF position and carries out refining, enter the VD station after refining is finished and carry out the vacuum outgas processing, justify bad continuous casting again, and it is the bad pipe that cuts into of continuous casting is bad, heat the continuous casting pipe is bad then, make it become the tandem rolling pipe to bad perforation of the pipe that heats with tandem rolling, tube rolling is carried out sending into the cold bed cooling behind the sizing, implement sawing then, the steel pipe that cuts is heat-treated, align then, finally by carrying out flaw detection, eligible is the hydraulic pressure stand tube finished product.
Its brief description of the process is: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → bad continuous casting of circle → cutting → heating of pipe blank → perforation → tube rolling → sizing → cooling → sawing → thermal treatment → aligning → flaw detection.
The bad production process of continuous casting circular tube is as described below:
1, with blast-melted through pre-treatment, make that the S amount (weight percent) that contains in the molten iron is reduced to below 0.010%.
2, pretreated molten iron is blended into top and bottom combined blown converter, add (weight percent) 10% high-quality steel scrap, adopt single slag technology to smelt, control finishing slag basicity and terminal point target, carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, 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 normally blown Ar 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, the refining of LF stove finishes back maintenance bottom soft blow Ar, by predetermined 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 justify bad continuous casting through the molten steel after the VD vacuum-treat, adopt constant speed control and the induction stirring technology of low pulling rate; The control molten steel overheat; Strand is through after aligning, and flame cutting is that pipe is bad.
To managing the bad chemical ingredients chemical examination of carrying out, manage bad chemical ingredients and should meet following requirement (weight percent %): C0.15-0.20; Si0.20-0.50; Mn1.40-1.70; P≤0.020; S≤0.010; Cr0.40-0.70; Ni0.20-0.50; V0.06-0.20; B0.0005-0.0020; Ti0.01-0.03; A10.01-0.04; Rare earth elements RE 0.0005-0.0100; Surplus is matrix Fe and the micro impurity element that can't detect.
Described rare earth elements RE is the norium of Ce, La, and their weight percent is respectively: Ce67%, La33%.
Add rare earth element and can play effects such as improving non-metallic inclusion form, reinforcement crystal boundary and crystal grain thinning, thereby obtain refined crystalline strengthening and the effect that improves impelling strength.
Composition is chemically examined qualified and sufur printing be not more than that 2.0 grades continuous casting circular tube is bad to carry out tubulation, the tubulation process is as follows:
To manage and bad put into process furnace and heat, continuous review and the temperature of each sections such as process furnace preheating section, heating zone, soaking zone controlled well, each section temperature controlling scope sees Table 1;
The control of each section of table 1 rotary heating furnace temperature (℃)
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching tube wall.
To be rolled into the weldless steel tube of the required specification of user after the bad perforation of the pipe that heat in corresponding continuous rolling-tube unit, every batch is carried out once heat sampling at least when rolling, checks geometrical dimension; Qualified steel pipe is heat-treated, and the furnace temperature of strict control quenching process furnace, adds thermostability and cooling water flow, guarantees the quenching quality; Furnace temperature and the temper resistance of strict control tempering process furnace.
Heat treating regime is: carry out shrend behind 860～910 ℃ of insulation 40～60min, 460～520 ℃ of laggard line spaces of insulation 70～90min are cold; It is straight to carry out the band temperature correction after the tempering, straightening temperature 〉=430 ℃.
Then steel pipe is pursued the Zhi Jinhang carrying out flaw detection.
Through above-mentioned tube-making process process, can produce " the hydraulic support weldless steel tube that contains rare earth " of the present invention.
The beneficial effect of the invention:
1. owing to being raw material with blast-melted, impurity content is relatively low;
2. owing to be with temperature correction straight more than 430 ℃, the unrelieved stress of steel pipe is lower, unrelieved stress :≤50MPa (adopting the ring cutting method);
3. because the unique component of rare earth element " contain design ", makes every excellent performance of steel pipe in conjunction with ripe production technique, the specific performance index is as follows:
Yield strength: 1000～1100MPa; Tensile strength: 1150～1250MPa; Yield tensile ratio :≤0.90; Unit elongation: 〉=17%; Traverse impact value: a
KV〉=100J/cm
2(0 ℃).
The present invention is directed to the problem that exists in the background technology, by technical measures such as " unique chemical compositions design and be the unique production technique of raw material with blast-melted ", solved the problems referred to above well, obtained obvious improvement.
Four, embodiment:
Be described in further detail below in conjunction with the present invention of embodiment.
Embodiment 1:
Raw material is by weight percentage: blast-melted 90%, and high-quality steel scrap 10%.
The technological process of production is in proper order: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → bad continuous casting of circle → cutting → heating of pipe blank → perforation → tube rolling → sizing → cooling → sawing → thermal treatment → aligning → flaw detection.
The concrete technological process of production is summarized as follows:
90 tons of blast-melted usefulness " metal magnesium powder " are done the desulfating and deoxidation pre-treatment, make the S amount that contains in the molten iron be reduced to (weight percent) below 0.010%.
Described 90 tons of preprocessed molten irons are blended in 100 tonnes the top and bottom combined blown converter, add 10 tons of high-quality steel scraps again, adopt single slag technology to smelt then, finishing slag basicity is by 3.0 controls, adopt silicomanganese, ferromanganese and ferrochrome to carry out deoxidation alloying during tapping, final deoxygenation adopts aluminium deoxidation technology, the necessary pushing off the slag of tapping process, the pushing off the slag failure must be skimmed, and adds 200kg lime piece after the tapping process interalloy adds.
Enter furnaceman LF position and carry out refining smelting the good molten steel ladle of packing into: normal Argon on request during refining, adopt from rudimentary and count to the mode heat temperature raising that senior number improves heat-up rate gradually; 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, and ferro-boron, nickel plate, vanadium iron and ferro-titanium added in the middle and later periods.
After finishing, the refining of LF stove to keep bottom soft blow Ar, by the rare-earth wires of predetermined add-on feeding certain-length.
Then the good molten steel of refining is carried out the VD vacuum-treat again: dark vacuum tightness≤0.10KPa, dark vacuum time 〉=13 minutes; Feed the silicon-calcium wire of certain-length again, feed the silk back and keep 8～10 minutes soft blow Ar.
Will be through the molten steel after the VD vacuum-treat big bag hang on ladle turret and carry out 5 machines, 5 bad continuous castings of stream circle, adopt constant speed control and the induction stirring technology of low pulling rate during continuous casting; Molten steel overheat Δ T≤30 ℃; Casting is aligned after badly going out the secondary cooling zone territory, is that pipe is bad with flame cutting then.
To managing bad samplingization, check, its chemical ingredients result of laboratory test (weight percent content) is as follows:
C0.17; Si0.33; Mn1.52; P0.017; S0.005; Cr0.51; Ni0.32; V0.12; B0.0013; Ti0.017; Al0.022; RE0.0010; Surplus is matrix Fe and the micro impurity element that can't detect; Described rare earth elements RE is: the norium that the La of 67% Ce+33% constitutes, its chemical ingredients and content thereof are qualified.
Sufur printing: all be no more than 1.0 grades, macroscopic examination is qualified.
The pipe of changing, being up to the standards is badly carried out tubulation, and the tubulation process is as follows:
Pipe is bad to have good rolling performance in order to make, and continuous detecting and controls preheating section, heating zone, the soaking zone temperature of process furnace, and it is thoroughly evenly and not overheated to guarantee to heat.
Each section of process furnace temperature is controlled automatically and automatic record with microcomputer.
Hot tool must be measured before use, must check before rolling, handle roller-way, avoids scratching tube wall.
The bad perforation of the pipe that heats back is rolled into the weldless steel tube that specification is Φ 299.00mm * 40.00mm at Φ 460mmPQF tube rolling unit, and every batch is carried out once heat sampling, checks geometrical dimension; Heat-treat afterwards: the furnace temperature of strict control quenching process furnace, add thermostability and cooling water flow, guarantee the quenching quality; Furnace temperature and the temper resistance of strict control tempering process furnace.
Heat treating regime is: come out of the stove behind 890 ± 10 ℃ of insulation 50min and carry out shrend, come out of the stove behind 490 ± 20 ℃ of insulation 80min and carry out air cooling.
The straightening temperature of steel pipe is 451 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 39MPa.
Through above-mentioned explained hereafter and nondestructiving inspecting test process, the finished product that eligible namely becomes " the hydraulic support weldless steel tube that contains rare earth " of the present invention.Produce sample with it and carry out mechanical property, metallographic structure check.
Through check, mechanical property, the metallographic structure detected value of the embodiment 1 hydraulic support weldless steel tube that produces see Table 2.
The mechanical property of table 2 steel pipe, metallographic structure detected result
Embodiment 2:
The proportioning raw materials of embodiment 2, the technological process of production etc. and other technic index are all identical with embodiment 1, and difference is the bad chemical composition content (weight %) of its pipe, specifically sees Table 3, and the mechanical property of weldless steel tube, metallographic structure detected result see Table 4.
The chemical ingredients detected result (weight %) that table 3 pipe is bad
The straightening temperature of steel pipe is 446 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 41MPa.
The mechanical property of table 4 steel pipe, metallographic structure detected result
Claims (10)
1. hydraulic support weldless steel tube that contains rare earth is characterized in that raw material is that 90% high-quality steel scrap blast-melted and 10% is formed by weight percent, and its chemical ingredients is respectively by weight percentage: C0.15-0.20; Si0.20-0.50; Mn1.40-1.70; P≤0.020; S≤0.010; Cr0.40-0.70; Ni0.20-0.50; V0.06-0.20; B0.0005-0.0020; Ti0.01-0.03; Al0.01-0.04; Rare earth elements RE 0.0005-0.0100; Surplus is matrix Fe and the micro impurity element that can't detect; The mechanical property of product: yield strength 1000～1100MPa, unrelieved stress≤50MPa, traverse impact value a
KV〉=100J/cm
2(0 ℃).
2. a kind of hydraulic support weldless steel tube that contains rare earth according to claim 1 is characterized in that RE is the norium of Ce and La, and its weight percent is: Ce67%, La33%.
3. the production method of the hydraulic support weldless steel tube that contains rare earth of feature according to claim 1 is characterized in that technological process of production summary is: hot metal pretreatment → top and bottom combined blown converter smelting → LF stove refining → VD vacuum-treat → bad continuous casting of circle → cutting → heating of pipe blank → perforation → tube rolling → sizing → cooling → sawing → thermal treatment → aligning → flaw detection.
4. a kind of production method that contains the hydraulic support weldless steel tube of rare earth according to claim 3 is characterized in that blast-melted through pre-treatment, makes that S content is reduced to weight percent below 0.010% in the molten iron; Pretreated molten iron and high-quality steel scrap are added top and bottom combined blown converter by design proportion respectively, adopt single slag technology to smelt, control finishing slag basicity and terminal point target; Carry out deoxidation alloying in the tapping process, final deoxygenation adopts aluminium deoxidation technology, and tapping process must pushing off the slag or skimmed adding lime piece after the tapping process interalloy adds.
5. a kind of production method that contains the hydraulic support weldless steel tube of rare earth according to claim 3 is characterized in that carrying out refining at the LF stove; The refining whole process is normal Argon on request, adopts from rudimentary and counts to the mode heat temperature raising that senior number improves heat-up rate gradually; 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.
6. according to claim 3 or 5 described a kind of production methods that contain the hydraulic support weldless steel tube of rare earth, it is characterized in that the refining of LF stove finishes the back and keeps bottom soft blow Ar, by predetermined add-on feeding rare-earth wires.
7. a kind of production method that contains the hydraulic support weldless steel tube of rare earth according to claim 3 is characterized in that carrying out the vacuum treated vacuum tightness≤0.10KPa of VD, dark vacuum time 〉=13 minutes.
8. according to claim 3 or 7 described a kind of production methods that contain the hydraulic support weldless steel tube of rare earth, feeding fixed length silico-calcium silk carries out blowing in 8～10 minutes Ar behind hello the silk when it is characterized in that the VD vacuum-treat.
9. a kind of production method that contains the hydraulic support weldless steel tube of rare earth according to claim 3 when it is characterized in that justifying bad continuous casting, adopts constant speed control and the induction stirring technology of low pulling rate and controls molten steel overheat≤30 ℃; Casting is bad aligns after going out the secondary cooling zone territory, and it is bad to be cut into pipe then.
10. a kind of production method that contains the hydraulic support weldless steel tube of rare earth according to claim 3, it is characterized in that adopting modifier treatment technology: carry out shrend behind 860～910 ℃ of insulation 40～60min, 460～520 ℃ of laggard line spaces of insulation 70～90min are cold; It is straight to carry out the band temperature correction after the tempering, straightening temperature 〉=430 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104451411A (en) * | 2014-12-22 | 2015-03-25 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube containing rare earth for Q420 structure and production method thereof |
| CN109778060A (en) * | 2019-03-26 | 2019-05-21 | 内蒙古锦和稀土功能材料有限公司 | Rare earth alloy and its preparation method and application |
| CN110952023A (en) * | 2019-11-07 | 2020-04-03 | 包头钢铁（集团）有限责任公司 | Rare earth treated high-toughness 1100 MPa-grade steel plate and preparation method thereof |
| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104451411A (en) * | 2014-12-22 | 2015-03-25 | 内蒙古包钢钢联股份有限公司 | Seamless steel tube containing rare earth for Q420 structure and production method thereof |
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| CN114619004A (en) * | 2022-02-28 | 2022-06-14 | 包头钢铁（集团）有限责任公司 | Rare earth microalloying cold-drawn high-strength seamless steel tube for hydraulic cylinder and preparation method thereof |
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Application publication date: 20131009 |