CN103276309A - Rare earth-containing wet H2S corrosion-resistant seamless steel pipe for hydraulic bracket and production method thereof - Google Patents
Rare earth-containing wet H2S corrosion-resistant seamless steel pipe for hydraulic bracket and production method thereof Download PDFInfo
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Abstract
The invention relates to a rare earth-containing wet H2S corrosion-resistant seamless steel pipe for a hydraulic bracket and a production method thereof and belongs to the technical fields of metallurgy and molding. The rare earth-containing wet H2S corrosion-resistant seamless steel pipe is prepared from the following raw materials: 90wt% of blast furnace molten iron and 10wt% of high-quality waste steel; the pipe billet comprises the following chemical components: 0.10-0.15wt% of C, 0.10-0.30wt% of Si, 0.80-1.10wt% of Mn, less than or equal to 0.015wt% of P, less than or equal to 0.005wt% of S, 0.90-1.20wt% of Cr, 0.30-0.50wt% of Mo, 0.30-0.50wt% of Ni, 0.06-0.20wt% of V, 0.01-0.03wt% of Ti, 0.01-0.04wt% of Al, 0.0005-0.0100wt% of rare earth element (RE), less than 0.10wt% of Cu and the balance of Fe and trace elements which cannot be detected. The process flow comprises pretreatment of the molten iron, top and bottom combined blowing converter smelting, ladle furnace (LF) refining, vacuum distillation (VD) vacuum treatment, round billet continuous casting, cutting, pipe billet heating, perforation, tandem rolling, reheating, sizing, cooling, saw cutting, heat treatment, straightening and flaw detection. The rare earth-containing wet H2S corrosion-resistant seamless steel pipe comprises the following mechanical properties: the yield strength is 800-870 MPa; the tensile strength is 950-1,030 MPa; the yield ratio is less than or equal to 0.90; the extension ratio is more than or equal to 19 percent; the transverse impact value aKV is more than or equal to 100 J/cm<2> (minus40 DEG C); the shear ratio is 100 percent; the grain size is more than or equal to 8.0 level; the hardness is less than or equal to 240 HV10; and the residual stress is less than or equal to 30 MPa. The seamless steel pipe has the characteristics of low impurity element content, small residual stress, high toughness matching degree, small grain size and high wet H2S corrosion resistance.
Description
One, affiliated technical field:
The invention belongs to ferrous metal smelting and stress metal manufacture field, relate to a kind of rare earth moisture-proof H that contains
2S corrosion hydraulic support weldless steel tube and production method thereof.
Two, background technology:
Hydraulic pressure stand tube is hydraulic prop and the used important materials of mining bracket major parts of mechanical mining coal.Usually require 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.In addition, there is H in China's part coal gas resource
2S gas, this brings serious etching problem to hydraulic support, in case the corrodibility cracking takes place, will cause catastrophic failure.Wet hydrogen sulfide corrosion mainly contains stress corrosion (SSC) and two kinds of broken base patterns of hydrogen induced cracking (HIC) (HIC).For this reason, the spy has developed moisture-proof H
2S corrosion hydraulic support weldless steel tube, the application of this material can prevent effectively that the generation of wet hydrogen sulfide corrosion is to the broken base of steel pipe.
By retrieval, in the document of Chinese invention patent, do not see the manufacture method report of such weldless steel tube.
Three, summary of the invention:
The purpose of this invention is to provide that a kind of impurity content is low, unrelieved stress is little, high, tiny, the moisture-proof H of crystal grain of obdurability coupling
2The S stress corrosion performance is high contains rare earth hydraulic support weldless steel tube and production method thereof.
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, carry out round billet continuous casting again, and continuously cast bloom cut into pipe, then continuously cast billet for pipe-making is heated, to the pipe that heats bore a hole and tandem rolling make it become the tandem rolling pipe, 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 → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem rolling → sizing → cooling → sawing → thermal treatment → aligning → flaw detection.
The production process of continuous casting circular tube blank 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 carry out round billet 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 circular pipe blank.
Pipe is carried out the chemical ingredients chemical examination, and the chemical ingredients of pipe should meet following requirement (weight percent %): C 0.10-0.15; Si 0.10-0.30; Mn 0.80-1.10; P≤0.015; S≤0.005; Cr 0.90-1.20; Mo 0.30-0.50; Ni0.30-0.50; V 0.06-0.20; Ti 0.01-0.03; Al 0.01-0.04; Rare earth elements RE 0.0005-0.010; Cu＜0.10; 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: Ce 67%, La 33%.
Add rare earth element and can play cleaning molten steel, improve the non-metallic inclusion form, strengthen effects such as crystal boundary, crystal grain thinning, thereby obtain refined crystalline strengthening and the effect that improves impelling strength.
Composition is chemically examined the continuous casting circular tube blank that qualified and sufur printing is not more than 2.0 grades carry out tubulation, the tubulation process is as follows:
Pipe is put into process furnace 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 (℃)
| Preheated one-section | Two sections of preheatings | Heat one section | Heat two sections | One section of soaking | Two sections of soaking |
| 800～980 | 900～1180 | 1250～1290 | 1270～1310 | 1270～1300 | 1260～1300 |
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 pipe that heats is rolled into the weldless steel tube of the required specification of user at corresponding tube rolling unit, and 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 880～930 ℃ of insulation 30～60min, 620～670 ℃ of laggard line spaces of insulation 60～90min are cold; It is straight to carry out the band temperature correction after the tempering, straightening temperature 〉=500 ℃.
Then steel pipe is pursued the Zhi Jinhang carrying out flaw detection.
Through above-mentioned technological process, can produce and of the present inventionly " contain rare earth moisture-proof H
2S corrosion hydraulic support weldless steel tube ".
The beneficial effect of the invention:
1. owing to be raw material with blast-melted, so impurity content is relatively low;
2. owing to be with temperature correction straight more than 500 ℃, the unrelieved stress of steel pipe is lower, unrelieved stress :≤30MPa (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: 800～870MPa; Tensile strength: 950～1030MPa; Yield tensile ratio :≤0.90; Unit elongation: 〉=19%; Traverse impact value: a
KV〉=100J/cm
2(40 ℃); Shear ratio: 100%; Grain fineness number: 〉=8.0 grades; Hardness :≤240HV10.
4. anti-HIC performance
According to NACE Standard TM 0284-2003 standard A method, through H
2The continuous 96 hours immersion of A solution that S is saturated, crackle does not appear in specimen surface.
5. anti-SSC performance
According to NACE Standard TM 0177-2005 standard A method, adopt smooth tension specimen method, the test constant stress is 0.8R
T0.5(640MPa), through H
2Cracking does not appear in the continuous 720 hours immersion of A solution that S is saturated, sample.
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:
Doing further ocean below in conjunction with the present invention of embodiment describes in detail bright.
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 → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem 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 nickel plate, molybdenum-iron, 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: 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 stream round billet continuous castings, adopt constant speed control and the induction stirring technology of low pulling rate during continuous casting; Molten steel overheat Δ T≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, is circular pipe blank with flame cutting then.
To pipe samplingization, check, its chemical ingredients result of laboratory test (weight percent content) is as follows:
C 0.12; Si 0.21; Mn 0.95; P 0.013; S 0.003; Cr 1.05; Mo 0.41; Ni 0.39; V 0.13; Ti 0.016; Al 0.022; RE 0.0013; Cu0.009; 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 carried out tubulation, and the tubulation process is as follows:
In order to make pipe have good rolling performance, continuous detecting and control preheating section, heating zone, the soaking zone temperature of process furnace, guarantee that heating is thoroughly evenly and not overheated.
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.
It is Ф 299.00mm * 40.00mm weldless steel tube that the pipe that heats is rolled into specification at Ф 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 900 ± 10 ℃ of insulation 50min and carry out shrend, come out of the stove behind 640 ± 20 ℃ of insulation 80min and carry out air cooling.
The straightening temperature of steel pipe is 537 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 26MPa.
Through above-mentioned explained hereafter and nondestructiving inspecting test process, eligible namely becomes of the present inventionly " contains rare earth moisture-proof H
2S corrosion hydraulic support weldless steel tube " finished product.Produce sample with it and carry out mechanical properties test.
Through check, the mechanical property detected value of embodiment 1 weldless steel tube that produces sees Table 2, SSC performance, HIC performance, organizes assay to see Table 3.
Table 2 steel pipe mechanical property detected result
Show 3SSC performance, HIC performance, organize assay
| The SSC performance | The HIC performance | Tissue | Grain fineness number |
| Sample did not rupture in continuous 720 hours | CSR＝0，CLR＝0，CTR＝0 | Tempering S+B | 8.5 level |
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 chemical composition content (weight %) of its pipe, specifically is shown in Table 4:
The chemical ingredients assay (weight %) of table 4 pipe
The straightening temperature of steel pipe is 533 ℃, and the unrelieved stress that the ring cutting method is measured steel pipe is 27MPa.
From result of laboratory test, its chemical composition content adheres to specification, and the sufur printing of its macroscopic examination all is no more than 1.0 grades, meets the tubulation requirement.Mechanical property detected value with the qualified weldless steel tube of its Rolling Production sees Table 5, SSC performance, HIC performance, organizes assay to see Table 6.
Table 5 steel pipe mechanical property detected result
Show 6SSC performance, HIC performance, organize assay
| The SSC performance | The HIC performance | Tissue | Grain fineness number |
| Sample did not rupture in continuous 720 hours | CSR＝0，CLR＝0，CTR＝0 | Tempering S+B | 8.5 level |
Claims (10)
1. one kind contains rare earth moisture-proof H
2S corrosion hydraulic support weldless steel tube 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: C 0.10-0.15; Si 0.10-0.30; Mn 0.80-1.10; P≤0.015; S≤0.005; Cr 0.90-1.20; Mo 0.30-0.50; Ni0.30-0.50; V 0.06-0.20; Ti 0.01-0.03; Al 0.01-0.04; Rare earth elements RE 0.0005-0.010; Cu＜0.10; Surplus is matrix Fe and the micro impurity element that can't detect; The mechanical property of product: yield strength 800～870MPa, unrelieved stress≤30MPa, traverse impact value: a
KV〉=100J/cm
2(40 ℃), grain fineness number 〉=8.0 grade; The SSC performance: constant stress is 0.8Rt
0.5=640MPa is through H
2A solution successive soaking, 720 hours samples that S is saturated do not ftracture; HIC performance: CSR=0, CLR=0, CTR=0.
2. a kind of rare earth moisture-proof H that contains according to claim 1
2S corrosion hydraulic support weldless steel tube is characterized in that RE is the norium of Ce and La, and its weight percent is: Ce 67%, La 33%.
One kind according to claim 1 feature contain rare earth moisture-proof H
2The production method of S corrosion hydraulic support weldless steel tube 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 → round billet continuous casting → cutting → heating of pipe blank → perforation → tandem rolling → sizing → cooling → sawing → thermal treatment → aligning → flaw detection.
4. a kind of rare earth moisture-proof H that contains according to claim 3
2The production method of S corrosion hydraulic support weldless steel tube 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 rare earth moisture-proof H that contains according to claim 3
2The production method of S corrosion hydraulic support weldless steel tube is characterized in that carrying out concise 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 rare earth moisture-proof H that contain
2The production method of S corrosion hydraulic support weldless steel tube 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 rare earth moisture-proof H that contains according to claim 3
2The production method of S corrosion hydraulic support weldless steel tube 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 rare earth moisture-proof H that contain
2The production method of S corrosion hydraulic support weldless steel tube, 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 rare earth moisture-proof H that contains according to claim 3
2The production method of S corrosion hydraulic support weldless steel tube when it is characterized in that carrying out round billet continuous casting, adopts constant speed control and the induction stirring technology of low pulling rate and controls molten steel overheat≤30 ℃; Strand is aligned after going out the secondary cooling zone territory, is cut into circular pipe blank then.
10. a kind of rare earth moisture-proof H that contains according to claim 3
2The production method of S corrosion hydraulic support weldless steel tube is characterized in that adopting modifier treatment technology: carry out shrend behind 880～930 ℃ of insulation 30～60min, 620～670 ℃ of laggard line spaces of insulation 60～90min are cold; It is straight to carry out the band temperature correction after the tempering, straightening temperature 〉=500 ℃.
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Cited By (5)
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| CN107326262A (en) * | 2017-06-22 | 2017-11-07 | 内蒙古包钢钢联股份有限公司 | The spud leg of marine drilling platform containing rare earth 800MPa seamless steel pipes and its working system method |
| CN107385350A (en) * | 2017-06-21 | 2017-11-24 | 内蒙古包钢钢联股份有限公司 | Marine drilling platform containing rare earth spud leg 700MPa seamless steel pipes and its production method |
| CN109457181A (en) * | 2018-11-23 | 2019-03-12 | 合肥紫金钢管股份有限公司 | A kind of seamless steel tubes and pipes for high pressure boiler and its manufacturing method |
| CN110093534A (en) * | 2019-05-17 | 2019-08-06 | 江苏亨通电力特种导线有限公司 | High conductivity heat-resisting aluminium alloy, preparation method and aerial condutor alloy aluminum lever |
| 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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| CN107385350A (en) * | 2017-06-21 | 2017-11-24 | 内蒙古包钢钢联股份有限公司 | Marine drilling platform containing rare earth spud leg 700MPa seamless steel pipes and its production method |
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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: 20130904 |