CN1152147C - Unmodified steel for sucker rod and its making technology - Google Patents
Unmodified steel for sucker rod and its making technology Download PDFInfo
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- CN1152147C CN1152147C CNB011060921A CN01106092A CN1152147C CN 1152147 C CN1152147 C CN 1152147C CN B011060921 A CNB011060921 A CN B011060921A CN 01106092 A CN01106092 A CN 01106092A CN 1152147 C CN1152147 C CN 1152147C
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- steel
- sucker rod
- rolling
- rod
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Abstract
The present invention belongs to the field of alloy steel and manufacture technology thereof, and particularly relates to a non-modified structural steel and manufacture technology thereof. The steel applied to the manufacture of a sucker rod contains chemical compositions (according to weight percentages) of 0.26% to 0.35% of C, 1.30% to 1.50% of Mn, 0.80% to 1.05% of Si, 0.080% to 0.15% of V, 0.02% to 0.05% of Ti, at most 0.04% of Mo, at most 0.02% of Cr and Ni, at most 0.25% of Cu, at most 0.025% of P, at most 0.025% of S, and Fe as the rest. By the steel manufacture technology, the non-modified sucker rod of the present invention is prepared from the chemical compositions through processes of rough smelting in an electric furnace and refining in an LF furnace, ingot casting, cogging, rolling, rolling of a high-precision continuous rolling mill for rod and wire material, aging treatment to form the finished product. The steel has the advantages of the non-modified steel, and a transition zone formed during hot processing has the mechanical performance which reaches up to the performance index of a D-grade sucker rod.
Description
The invention belongs to steel alloy and manufacturing process field, relate to a kind of unmodified steel for sucker rod and manufacturing process.
Quenched and tempered steel such as petroleum system employing 20CrMoA because its modifier treatment power consumption is high, are developed non-hardened and non-tempered alloy structure steel 30SiMnV (Chinese patent 95111888 as steel for sucker rod afterwards.9 is open), its chemical ingredients proportioning (by weight percentage) is: C 0.27%～0.35%, and Si 0.90%～1.20%, and Mn 1.20%～1.50%, and V 0.10%～0.20%, P, S≤0.035%, all the other are Fe for Cr, Ni, Cu≤0.03%.After this develop ferrite+perlite (F+P) type non-hardened and tempered steel again and do steel for sucker rod (" Dalian special steel " the 2nd phase in 2000＜non-quenched-tempered sucker-rod with the research of guiding principle 〉), this steel grade is selected middle low-carbon (LC) for use, Mn, Si are in 1.0%～1.4% scope, and the V of interpolation trace.Once supplied 3200 tons to users such as Tieling machine works, machine works of Daqing Petroleum Administration and Shengli Oil Field machine workss.Above-mentioned non-hardened and tempered steel is done steel for sucker rod, fatal weakness of ubiquity in use: machine works is to sucker rod forge hot, machining, connect fastening back afterwards uses to the oil field, but to its forge hot district and body of rod joint portion (hot-work zone of transition) when doing tension test, the plasticity index instability of hot-work zone of transition, on the low side, do not reach D grade pumping rod performance: δ 〉=10% and φ 〉=50%, rupture.
The object of the invention is to provide a kind of unmodified steel for sucker rod and manufacturing process.After the local forge hot processing of this steel, zone of transition still can reach D grade pumping rod performance index: tensile strength sigma b793～965MPa, yield strength σ s 〉=620MPa, elongation after fracture δ
200〉=10%, relative reduction in area φ 〉=50% and impact absorbing energy Ak 〉=47.0J.
The present invention adopts following technical scheme:
Unmodified steel for sucker rod chemical ingredients proportioning (by weight percentage) among the present invention is C 0.26%～0.35%, Mn 1.30%～1.50%, Si 0.80%～1.05%, V 0.08%～0.15%, Ti 0.02%～0.05%, Mo≤0.04%, Cr+Ni≤0.02%, Cu≤0.25%, P, S≤0.025%, and all the other are Fe.
Unmodified steel for sucker rod among the present invention is by following technology manufacturing: electric furnace+LF stove → ingot casting → 750 milling trains cogging → flaw detection, reconditioning → high precision wire and rod continuous rolling machine be rolling → the cold bed air cooling → cut scale → ageing treatment → become a useful person.
Add Ti-Fe in the steel-making refining procedure, making the Ti heat analysis is 0.02%～0.05%.Tandem rolling adopts cooling controlling and rolling controlling process: 1050 ℃～1080 ℃ of Heating temperatures, finishing temperature≤900 ℃, 3 ℃/s of speed of cooling.200 ℃～600 ℃ * 6h of ageing treatment tempering.
Specify the technical scheme content below:
Carbon: for guaranteeing that the ferrite volumn concentration 48%～52%, improves the plasticity of steel, carbon range is selected in 0.26%～0.35%.
Manganese: improve intensity.By solution strengthening, crystal grain thinning improves intensity, reduces perlite sheet spacing, improves toughness." " the curve increase hardening capacity that moves right surpasses at 1.5% o'clock and easily produces bainite structure C, and manganese content is high as far as possible guaranteeing to be organized as under ferrite+pearlitic prerequisite, and the manganese scope is selected in 1.30%～1.50% but manganese makes again.
Silicon: as the principal element that improves yield strength (raising yield tensile ratio), its solid solution strengthening effect is higher than manganese, can produce M-A island structure thing in ferrite, effectively improves the intensity of steel.The increase of silicone content can reduce plasticity, and the reduction to unit elongation is bigger especially.The silicon scope is selected in 0.80%～1.05%.
Vanadium, titanium: belong to micro alloying element, the multiple strengthening more remarkable effect of vanadium and titanium.Undissolved V, Ti in the heat-processed (C, N) change the material point, by pinning crystal boundary crystal grain thinning, produce the solution strengthening effect; In the operation of rolling, by deformation induced, separate out V, Ti (C, N) change thing and be deposited on crystal boundary and the dislocation, pinning effect prevents that dislocation moving from improving intensity, prevents that recrystallize and grain growth from improving toughness, reaches the quenched and tempered steel level.The vanadium scope is selected in 0.08%～0.15%.
Stress the effect of titanium in the second-heating of steel.The sucker rod body of rod forges the influence that district and shank portion zone of transition are subjected to second-heating when twice heat forging, pearlite-ferrite and throw out fuse into austenite again, austenite trend alligatoring under the high temperature.Be subjected to the influence of forging deformation, crystal grain fragmentation, recrystallize (this process is similar to process of cooling to rolling finish to gauge) will take place in deformed austenite, therefore forge the crystal grain in district and can significantly not grow up.And the zone of transition distortion is very little or indeformable, can't realize austenitic recrystallize, and keeps bigger austenite crystal, and forms thick perlite+ferrite crystal grain in transformation subsequently.The reason that this causes zone of transition plasticity to reduce just.The effective way that stops the austenite alligatoring is to improve austenite alligatoring temperature.Element ti just can stop austenite to be grown up effectively, and reduces the content of solid solution C, N in the steel, and its austenite alligatoring temperature is brought up to more than 1150 ℃.Can solve the zone of transition performance issue so add an amount of Ti.Because of the second-heating temperature generally about 1100 ℃, so zone of transition cooling its crystal grain of back and body of rod basically identical keep its high-performance constant.For the above reasons, the titanium scope is selected in 0.02%～0.05%.
Chromium nickel molybdenum belongs to harmful element in this steel.Because it increases the hardening capacity of steel, special and effect that manganese combines makes steel easily produce bainite structure.General Mn+Cr+Ni+Mo 〉=1.60% under 〉=0.5 ℃/s cooling rate, is easy to occur bainite, and it is low more good more that chromium, nickel and molybdenum are required.Molybdenum≤0.04%, chromium+nickel≤0.02%, copper≤0.25%.Sulphur, phosphorus≤0.025%.
Unmodified steel for sucker rod manufacturing process principal feature of the present invention is:
1) in steel-making LF stove refining procedure, adds Ti-Fe;
2) in rolling process, 1. control 1050 ℃～1080 ℃ of Heating temperatures.Make the alloying element solid solution, avoid AUSTENITE GRAIN COARSENING and ferrite content to reduce and nettedization, guarantee plasticity and toughness.2. finishing temperature≤900 ℃.The high recrystallize that easily takes place of finishing temperature is grown up rapidly, and is difficult for taking place deformation induced separating out.It is rolling that wire and rod continuous rolling belongs to intensification, effectively controls finishing temperature elongation after fracture (200mm gauge length) and can improve 2%～3%.3. speed of cooling, the particularly speed of cooling between 800 ℃～500 ℃ are to granular size, the quantity of precipitate and perlite relative quantity and sheet spacing are all had significantly affecting.Best cooling rate is 3 ℃/s.
3) ageing treatment, the relative reduction in area of steel is lower after the hot rolling, rise to some extent through natural aging, but need be through the time of some months.For reaching actual performance as early as possible, adopt low-temperaturetempering, accelerated ag(e)ing.Treatment process is 200 ℃～600 ℃ * 6h tempering, and relative reduction in area can rise 20%～35%.
The present invention has following advantage:
The first, dependable performance can guarantee steel after its local forge hot processing, and the zone of transition performance still is consistent with the body of rod, still can reach D grade pumping rod performance index, and fatigue lifetime is more than 1,000,000 times.
The second, hot rolling material can effectively improve plasticity and toughness fast, and intensity is constant substantially through the low-temperaturetempering timeliness, and steel need not aligned.
The 3rd, remarkable in economical benefits.This steel grade has not only that the non-hardened and tempered steel alloy content is low, the low advantage of production cost, and reduces refining losses, aligning expense and reduce labor intensity, and improves advantages such as environment.
The embodiment of the invention: by chemical ingredients proportion ingredient two stoves of the present invention.Slightly refine at the 30t electric furnace, remove p, eccentric bottom tapping; LF stove ladle refining adds the diffusive deoxidation of C-Si powder, adds Ti-Fe, makes the Ti heat analysis reach 0.02%～0.05%; Be cast into the red commentaries on classics of 3.0t ingot, 750 milling train coggings, 150 square billets, controlled walking-beam furnace respectively is heated to 1060 ℃, 1080 ℃, on high speed alloy steel rod wire tandem rolling machine, be rolled into chi materials such as ∮ 19mm, ∮ 22mm, adopt water-cooled before the finish to gauge, finishing temperature respectively is 870 ℃, 890 ℃, after temper aging handles, the processing system respectively is 290 ℃ * 6h, 310 ℃ * 6h.
Its performance reaches respectively
σ
b880MPa, σ
s660MPa, δ
20017%, φ 56% and A
k64J.
σ
b930MPa, σ
s700MPa, δ
20016%, φ 55% and A
k68J.
Unmodified steel for sucker rod is fine to the relevant user 1700 tons of results of use of supplying.
Claims (2)
1 one kinds of unmodified steel for sucker rod, it is characterized in that chemical ingredients (by weight percentage) scope is: C 0.26%～0.35%, Mn 1.30%～1.50%, Si 0.80%～1.05%, V0.08%～0.15%, Ti 0.02%～0.05%, Mo≤0.04%, Cr+Ni≤0.02%, Cu≤0.25%, P, S≤0.025%, all the other are Fe.
The manufacturing process of the described unmodified steel for sucker rod of 2 claims 1, it is characterized in that entering electric furnace and slightly refining after the batching+LF stove refining → ingot casting → cogging → high precision wire and rod continuous rolling machine is rolling → ageing treatment → become a useful person, add Ti-Fe at LF stove refining procedure, rolling 1050 ℃～1080 ℃ of the cooling controlling and rolling controlling process Heating temperatures of taking of high precision wire and rod continuous rolling machine, finishing temperature≤900 ℃, system of ageing treatment is 200 ℃～600 ℃ * 6h tempering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011060921A CN1152147C (en) | 2001-01-17 | 2001-01-17 | Unmodified steel for sucker rod and its making technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011060921A CN1152147C (en) | 2001-01-17 | 2001-01-17 | Unmodified steel for sucker rod and its making technology |
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| Publication Number | Publication Date |
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| CN1366090A CN1366090A (en) | 2002-08-28 |
| CN1152147C true CN1152147C (en) | 2004-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB011060921A Expired - Fee Related CN1152147C (en) | 2001-01-17 | 2001-01-17 | Unmodified steel for sucker rod and its making technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351419C (en) * | 2004-09-15 | 2007-11-28 | 玉门石油管理局 | Anti-corrosion oil pumping rod and its producing method |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004083475A1 (en) * | 2003-03-18 | 2004-09-30 | Sumitomo Metal Industries Ltd. | Non-quenched/tempered connecting rod and method of producing the same |
| CN101571033B (en) * | 2009-05-26 | 2011-08-17 | 铁岭米勒石油新材料有限公司 | Polished sucker rod |
| CN102061891A (en) * | 2009-11-18 | 2011-05-18 | 安东石油技术（集团）有限公司 | Oil pumping polish rod |
| CN102653816B (en) * | 2012-05-02 | 2014-05-14 | 江苏华程工业制管股份有限公司 | Preparing process of alloy-steel pipe used for hydraulic cylinder tube |
| CN104801563B (en) * | 2014-01-28 | 2017-01-04 | 宝钢特钢有限公司 | Manufacturing method of medium-carbon non-quenched and tempered steel for crankshaft |
| CN109759779A (en) * | 2017-11-09 | 2019-05-17 | 苏州苏信特钢有限公司 | A kind of non-hardened and tempered steel motor shaft and its processing method |
| CN109252097B (en) * | 2018-10-10 | 2020-09-29 | 江阴兴澄特种钢铁有限公司 | Non-quenched and tempered steel of high-strength expansion-fracture connecting rod and continuous casting production process thereof |
-
2001
- 2001-01-17 CN CNB011060921A patent/CN1152147C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100351419C (en) * | 2004-09-15 | 2007-11-28 | 玉门石油管理局 | Anti-corrosion oil pumping rod and its producing method |
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| Publication number | Publication date |
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| CN1366090A (en) | 2002-08-28 |
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