CN110273101A - A kind of H grade pumping rod and preparation method thereof - Google Patents

A kind of H grade pumping rod and preparation method thereof Download PDF

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Publication number
CN110273101A
CN110273101A CN201910520756.1A CN201910520756A CN110273101A CN 110273101 A CN110273101 A CN 110273101A CN 201910520756 A CN201910520756 A CN 201910520756A CN 110273101 A CN110273101 A CN 110273101A
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steel
sucker rod
slag
rolling
tapping
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易敏
陈涛
孙齐松
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Shougang Group Co Ltd
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Shougang Group Co Ltd
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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • Y02P10/25—Process efficiency

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Abstract

A kind of H grade pumping rod and preparation method thereof, belongs to structural alloy steel technical field.The chemical component of steel for sucker rod is contained in terms of mass percent score: C:0.12-0.16%, Si:1.4-1.6%, Mn:0.90-1.10%, Cr:1.8-2.0%, Mo:0.08-0.12%, Nb:0.035-0.055%, Ti:0.01-0.03%, B:0.001-0.003%, Al:0.020-0.040%, P :≤0.020%, S :≤0.015%, surplus is iron and inevitable impurity.The preparation method of sucker rod includes 210 tons of top and bottom complex blowing formula converter smeltings, and Ar, continuous casting work 1.3~1.6m/min of pulling rate are blown in refining, and bar continuous rolling production line is rolled into φ 16mm~φ 35mm specification sucker rod round steel；After the hot upsetting of head, 920~940 DEG C of Medium frequency induction normalizings of whole bar.The advantage is that low-carbon CrMo alloying ingredients system, corrosion resistance are good；Obtained sucker rod mechanical property is tough, plasticity, resistance to corrosion fatigue function admirable.

Description

A kind of H grade pumping rod and preparation method thereof
Technical field
The invention belongs to structural alloy steel technical field, in particular to a kind of H grade pumping rod and preparation method thereof.Especially relate to And a kind of comprehensive mechanical property, corrosion fatigue resistant function admirable H grade pumping rod steel and its H grade pumping rod manufacturing method.
Background technique
Sucker rod is the important component that oil extraction in oil field system is used to connect ground pumping unit and downhole pump, and sucker rod will The power of pumping unit passes to downhole pump.In oil recovery production process, what sucker rod was born is asymmetric cyclic loading, That is: fatigue load.Working media is well liquid, and crude oil and the very high water of salinity are contained in well liquid, also containing corrosive medium salinity, Carbon dioxide or hydrogen sulfide etc..The corrosion function of corrosive medium will be greatly reduced the service life of sucker rod.Therefore, sucker rod Considered repealed form shows as fatigue corrosion fracture.
According to SY5029 " sucker rod " standard, varying strength rank sucker rod is suitable for the oil well of different load.For most The H grade pumping rod of high intensity levels, it is desirable that yield strength Rel >=795MPa, tensile strength Rm >=965MPa, elongation A200≥ 10%, reduction of area Z >=45%, ballistic work Aku2≥60J.Therefore, in the service phase of underground work, in addition to requiring sucker rod to have Have excellent intensity, toughness comprehensive mechanical property, also require sucker rod under corrosive medium environment have it is good anticorrosive Fatigue behaviour.
It is existing H grades of pumping rod steel or H grade pumping rod patented technology in table 1.
Table 1
In order to obtain the H grade pumping rod steel of higher intensity rank, CN92102405.3, CN200710188009.X, The Mn element that CN201010279571.5, CN201310137595.0 use high level carries out alloying or the micro- conjunction of V element Aurification realizes high intensity.But Mn too high levels can make the toughness for reducing steel, while be unfavorable for the corrosion resistance of steel.V element is effective The intensity of steel is improved, but unhelpful to toughness plasticity and corrosion resistance.A kind of surface is proposed in CN200710188009.X to dust processing Technology, this technology increases corrosion resistance using coating is formed in sucker rod surface spraying alloy powder, but production cost is big It is big to improve.
CN201010577993.0 use Cr, V alloy, CN200410062593.0, CN200910113600.8, CN201010292922 uses traditional CrMo alloying mode, these patents all use Tempering and Quenching (quenching+return Fire) obtain good obdurability comprehensive performance, but in order to obtain higher intensity, use lower (less than 600 DEG C) and return The recovery and recrystallization process of fiery temperature, quenching structure is insufficient, and quenching stress can not completely eliminate, this is all unfavorable for the resistance to of steel Corrosion.
CN201410433322.5 passes through the Cr element of high level 2% and 1% Cu and Al element, improves sucker rod Intensity and resistance to corrosion.But 1% Cu is easy easily to form the crackle of slab and steel, sucker rod when smelting and when heating With the fatigue behaviour of the face crack damage sucker rod of steel.And the so high Al of 0.3-0.7% recovery rate when smelting is difficult Guarantee.
CN200710099352.7 discloses a kind of H grade pumping rod steel of low carbon high-strength bainite structure, has good Comprehensive mechanical property, but since Si, Mn, Cr composition range are wider, retained austenite contains in the bainite structure caused Measure that unstable to will cause performance unstable.
In addition, all not mentioning the Corrosion Fatigue Properties of H grade pumping rod in invention disclosed above.
Different from air environment, the surface of sample in corrosive media by etch after, fatigue strength is far low Fatigue strength under air environment.Therefore, practical in underground work investigate is its Corrosion Fatigue Properties to sucker rod.It is rotten Erosion fatigue behaviour depends primarily on the propagation behavior of fatigue crack again.
Summary of the invention
The purpose of the present invention is to provide a kind of H grade pumping rods and preparation method thereof, solve H grade pumping rod Steel material The problem of high-intensity and high-tenacity and good corrosion fatigue resistant performance cannot be fully met.The present invention provides one kind with good The manufacturing method of good comprehensive mechanical property, the H grade pumping rod steel of corrosion fatigue resistant performance and H grade pumping rod.It is required that surrender Intensity Rel >=795MPa, tensile strength Rm >=965MPa, elongation A200>=10%, reduction of area Z >=45%, ballistic work Aku2≥ 60J.Under the premise of meeting strength and toughness performance requirement, also completely to ask has good corrosion fatigue under corrosive medium environment Performance.
A kind of H grade pumping rod is contained in terms of mass percent score with the chemical component of steel: C:0.12-0.16%, Si:1.4-1.6%, Mn:0.90-1.10%, Cr:1.8-2.0%, Mo:0.08-0.12%, Nb:0.035-0.055%, Ti: 0.01-0.03%, B:0.001-0.003%, Al:0.020-0.040%, P :≤0.020%, S :≤0.015%, surplus is iron And inevitable impurity.
The design principle of each ingredient of the present invention:
Guarantee toughness plasticity and corrosion resistance simultaneously to improve intensity, also to guarantee the spreading rate of low fatigue crack.This hair The bright component system using low carbon high-strength bainitic steel.Cr, Mn, Mo element improve steel intensity, while Cr, Mo be conducive to it is resistance to Corrosion；The harden ability acquisition bainite structure for improving steel is used in combination in Nb, Mo, B；It is tough that Nb, Ti had both refined bainite structure raising Plasticity, and be conducive to B element and play the effect for improving harden ability；Si element is conducive to prevent carbide during bainitic transformation Precipitation, obtain stable retained austenite, improve the toughness plasticity of steel, stable retained austenite can effectively prevent fatigue The extension of crackle, to reduce the expansion rate of crackle.
The effect of specific each chemical element:
C:C is most cheap solution strengthening element, but as the raising of carbon content, the harden ability of steel improve, intensity is improved, But toughness plasticity reduces, and corrosion resisting property can also reduce, D grade pumping rod steel in order to guarantee to take into account harden ability and toughness plasticity, corrosion resistance, General C content is 0.20-0.40%.But for the H grade pumping rod steel of higher intensity, if using >=0.20% C content, Under conditions of controlling cost, toughness plasticity, corrosion resistance all it is difficult to ensure that.Therefore present invention employs low carbon content, C's of the present invention Range of choice is in 0.12-0.16%.
Si:Si is non-carbide forming element, and Si can prevent the precipitation of carbide during bainitic transformation, make bainite There are stable retained austenites in ferrite lath or between lath.It with this histioid steel, is tempered, can make through proper temperature The fracture toughness of steel significantly improves, and is also beneficial to hinder the extension of fatigue crack in fatigue corrosion fracture process kind.Therefore, in order to The bainitic steel of high-intensity and high-tenacity is obtained, higher Si alloying is used.The present invention experiments have shown that, Si content is lower than 1.4%, toughness is insufficient, is higher than 1.6%, toughness has a declining tendency.It is thus determined that the range of choice of Si of the present invention is in 1.4- 1.6%.
Mn:Mn is the cheap element for improving harden ability.But Mn too high levels, can be excessive in interfacial segregation, reduces steel instead Toughness.The present invention experiments have shown that, Mn content be lower than 0.9%, harden ability is slightly lower, be higher than 1.10%, toughness is begun to decline.Therefore Determine the range of choice of Mn of the present invention in 0.90-1.10%.
Cr:Cr is surface active element, can block anodic process and promote cathodic process, conducive to the corrosion resistance for improving steel Energy.But Cr too high levels increase the cost of material, comprehensively consider material cost performance, determine that the range of choice of Cr of the present invention exists 1.8-2.0%.
Mo:Mo is the element for improving the harden ability of steel, while being also surface active element as Cr, conducive to steel is improved Corrosion resistance, Cr and Mo are used cooperatively, and can obtain the better surface passivated membrane of protectiveness.But Mo is expensive, comprehensively considers material Cost performance determines the range of choice of Mo of the present invention in 0.08-0.12%.
Nb:Nb element and B element collective effect, improve the stability of austenite, improve the harden ability of steel, promote bainite Phase transformation.In addition, Nb is the most effective element of refined crystalline strengthening, the C element in Nb and steel forms Second Phase Precipitation object and prevents austenite Crystal grain is grown up, thinning microstructure, improves the obdurability of steel.According to the solid solution of Nb, C product formula, the range of choice of Nb of the present invention is determined In 0.035-0.055%.
Ti:Ti element is added in low-carbon bainite steel, can fix the N element dissolved in steel, in order to avoid N element and B member Element combines and forms BN.Simultaneously Nb, Ti combined microalloying can during heating rolling, in the hot procedure of user, Austenitizing crystal grain can be refined, the obdurability of steel is improved.To be completely fixed the N element in steel, the content of Ti should be N 3.4 times of content.In view of the N element content controlled level of the such steel routine of this enterprise, when Ti content is lower than 0.01%, no The N element being enough in fixed steel, affects contribution of the B to harden ability.And excessive Ti will lead to toughness decline, accordingly, it is determined that The range of choice of Ti of the present invention is in 0.01-0.03%.
B: the B of denier can improve the harden ability of steel significantly.In steel just using minimal amount of B element microalloying It can cause bainitic transformation and generate significant strengthening effect.However when individually adding B, B can form Fe with C23(C,B)6, with N BN is formed, the content decline of the molten boron of acid in steel is caused, affects the strengthening effect of B.And B content it is excessively high when, harden ability again instead It can decline.The present invention shows that the range of choice of Nb in steel is 0.03-0.05% by a large amount of Nb, Ti, B composite test, Ti's When range of choice is 0.01-0.03%, the optimal selection range of B is 0.001-0.003%.
Effect of the Al:Al element in steel is mainly deoxidier, unsuitable too low, and also unsuitable excessively high, the present invention is according to test The range of choice that Al has been determined is 0.020-0.040%.
P, S:P, S are impurity elements, and content is lower, and purity of steel is higher, and toughness can be better, in conjunction with the tooling work of enterprise Artistic skill power determines the range of choice of P, S of the present invention in P≤0.020%, S≤0.015%.
The preparation method of above-mentioned H grade pumping rod, including smelt, continuous casting, rolling, specific step and parameter is as follows:
1, it smelts: 210 tons of top and bottom complex blowing formula converter smeltings, converter terminal control P≤0.010wt%, C:0.04~ 0.08wt%；Tapping temperature is by 1670~1690 DEG C of controls；Steel per ton is added AlMnFe 4.0kg deoxidation when tapping, and to Si, Mn, Cr, Mo and Nb carry out ingredient initial adjustment；Using slag-stopping tapping, when tapping, 2.5~4Kg of binary synthetic slag was added in steel per ton；
2, refine: molten steel arrive at a station after according to wrap in scoriform condition add aluminum shot, arrive at a station after blowing Ar sample, determine oxygen；Use synthetic slag Slag making, by 1.6~2.2 tons of controls, refining process pays attention to keeping white slag and reducing atmosphere the quantity of slag；Trimming is carried out, then Ferrotianium tune Ti is added, is eventually adding ferro-boron tune B；Later, Si-Ca line 300m/ furnace, soft argon blowing time >=10min are fed；
3, it continuous casting: is cast using full guard；Using band dam tundish, high alkalinity coverture is used；Crystallizer uses pre- Molten type granular protecting cinder, carries out electromagnetic agitation；The molten steel temperature in tundish degree of superheat: 20~35 DEG C, 180mm × 180mm square billet, work Make 1.3~1.6m/min of pulling rate；Slab is into burial pit, slow cooling time >=24 hour；
4, roll: bar continuous rolling production line is rolled into φ 16mm~φ 35mm specification sucker rod round steel；In the operation of rolling Carry out controlled rolling, control cooling；1100~1150 DEG C of start rolling temperature；It 850 DEG C~900 DEG C of finishing temperature, is controlled after rolling upper cold Bed tempertaure: 600 DEG C~700 DEG C.
5, be heat-treated: after the hot upsetting of head, 920~940 DEG C of Medium frequency induction normalizings of whole bar, 350~400 DEG C of Medium frequency inductions are returned Fire.
The present invention has the advantages that
1, low-carbon CrMo alloying ingredients system, corrosion resistance are good.
2, Nb, Ti microalloying obtain refinement bainite structure, and Si alloying obtains retained austenite and is conducive to toughness It improves.From the bainite structure figure that Fig. 1 is refined, crystallite dimension only about 10um；The visible shellfish from Fig. 2 fine structure organization chart Film of retained austenite between family name's body lath.The bainite structure of refinement and retained austenite are conducive to increase the toughness of steel, together When hinder crack Propagation, improve fatigue life.
3, using normalizing+tempering heat treatment process, simple process, obtained sucker rod mechanical property is tough, plasticity, Resistance to corrosion fatigue function admirable.
Detailed description of the invention
Fig. 1 is the bainite structure figure that the present invention refines.
Fig. 2 is fine structure organization chart of the invention.
Fig. 3 is the shape appearance figure of corrosion fatigue fracture of the present invention.
Fig. 4 is the shape appearance figure of comparative example corrosion fatigue fracture.
Specific embodiment
The present invention will be described combined with specific embodiments below.In order to further illustrate the present invention the advantages of, spy list A comparative example 20Cr2Mo steel similar in ingredient, comparative example C content is slightly higher, has dropped Si content, Mo content is slightly higher, without Nb, Ti, B element.
Embodiment 1-3 and the ingredient percent of comparative example are as shown in table 2 below:
Table 2
The preparation method of above-mentioned H grade pumping rod, including smelt, continuous casting, it rolls, heat treatment, specific step and parameter is as follows:
Embodiment 1
(1) it smelts
210 tons of top and bottom complex blowing formula converter smeltings, it is 0.009% that converter terminal, which controls P, and terminal point control C is 0.04%, tapping Temperature is 1673 DEG C.Steel addition AlMnFe 4.0kg deoxidation per ton when tapping, and ingredient initial adjustment is carried out to Si, Mn, Cr, Mo, Nb. Using slag-stopping tapping, when tapping, binary synthetic slag 2.8Kg was added in steel per ton.
(2) it refines
Molten steel arrive at a station after according to wrap in scoriform condition add aluminum shot.It arrives at a station and is sampled after blowing Ar, determines oxygen.Using synthetic slag slag making, close At 1.8 tons of the quantity of slag, refining process pays attention to keeping white slag and reducing atmosphere.Carry out trimming.Then ferrotianium tune Ti is added, most Ferro-boron tune B is added afterwards.Later, Si-Ca line 300m/ furnace, soft argon blowing time 13min are fed.
(3) continuous casting
It is cast using full guard.Using band dam tundish, high alkalinity coverture is used.Crystallizer uses pre-melted type particle Covering slag carries out electromagnetic agitation.The molten steel temperature in tundish degree of superheat: 31 DEG C, 180mm × 180mm square billet, work pulling rate 1.3m/ min.Slab is into burial pit, and slow cooling time 28 hours.
(4) rolling mill practice:
Bar continuous rolling production line is rolled into φ 19mm specification sucker rod round steel.Controlled rolling is carried out in the operation of rolling, is controlled Refrigeration is but.1120 DEG C of start rolling temperature；850 DEG C of finishing temperature, control temperature on cooling table after rolling: 620 DEG C.
(5) user's heat treatment process
Steel for sucker rod raw material is after the hot upset forging of both ends, the 930 DEG C of Medium frequency induction normalizings of whole bar, and 400 DEG C of Medium frequency inductions return Fire.
Embodiment 2
(1) it smelts:
210 tons of top and bottom complex blowing formula converter smeltings, converter terminal control P:0.006%, C:0.06%.Tapping temperature: 1678 ℃.Steel addition AlMnFe 4.0kg deoxidation per ton when tapping, and ingredient initial adjustment is carried out to Si, Mn, Cr, Mo, Nb.Gone out using pushing off the slag Steel, when tapping, binary synthetic slag 3.2Kg was added in steel per ton.
(2) it refines
Molten steel arrive at a station after according to wrap in scoriform condition add aluminum shot.It arrives at a station and is sampled after blowing Ar, determines oxygen.Using synthetic slag slag making, close At 1.9 tons of the quantity of slag, refining process pays attention to keeping white slag and reducing atmosphere.Carry out trimming.Then ferrotianium tune Ti is added, most Ferro-boron tune B is added afterwards.Later, Si-Ca line 300m/ furnace, soft argon blowing time 18min are fed.
(3) continuous casting
It is cast using full guard.Using band dam tundish, high alkalinity coverture is used.Crystallizer uses pre-melted type particle Covering slag carries out electromagnetic agitation.The molten steel temperature in tundish degree of superheat: 24 DEG C, 180mm × 180mm square billet, work pulling rate 1.6m/ min.Slab is into burial pit, and slow cooling time 36 hours.
(4) rolling mill practice:
Bar continuous rolling production line is rolled into φ 22mm specification sucker rod round steel.Controlled rolling is carried out in the operation of rolling, is controlled Refrigeration is but.1145 DEG C of start rolling temperature；885 DEG C of finishing temperature, control temperature on cooling table after rolling: 650 DEG C.
(5) user's heat treatment process
Steel for sucker rod raw material is after the hot upset forging of both ends, the 940 DEG C of Medium frequency induction normalizings of whole bar, and 380 DEG C of Medium frequency inductions return Fire.
Embodiment 3
(1) it smelts:
210 tons of top and bottom complex blowing formula converter smeltings, converter terminal control: P 0.005%, terminal point control C are 0.07%, out Steel temperature is 1682 DEG C.Steel addition AlMnFe 4.0kg deoxidation per ton when tapping, and at the beginning of Si, Mn, Cr, Mo, Nb progress ingredient It adjusts.Using slag-stopping tapping, when tapping, binary synthetic slag 3.9Kg was added in steel per ton.
(2) it refines
Molten steel arrive at a station after according to wrap in scoriform condition add aluminum shot.It arrives at a station and is sampled after blowing Ar, determines oxygen.Using synthetic slag slag making, close At 2.2 tons of the quantity of slag, refining process pays attention to keeping white slag and reducing atmosphere.Carry out trimming.Then ferrotianium tune Ti is added, most Ferro-boron tune B is added afterwards.Later, Si-Ca line 300m/ furnace, soft argon blowing time 15min are fed.
(3) continuous casting
It is cast using full guard.Using band dam tundish, high alkalinity coverture is used.Crystallizer uses pre-melted type particle Covering slag carries out electromagnetic agitation.The molten steel temperature in tundish degree of superheat: 28 DEG C.160mm × 160mm square billet, work pulling rate 1.7m/ min.Slab is into burial pit, and slow cooling time 30 hours.
(4) rolling mill practice:
Bar continuous rolling production line is rolled into φ 28mm specification sucker rod round steel.Controlled rolling is carried out in the operation of rolling, is controlled Refrigeration is but.1135 DEG C of start rolling temperature；860 DEG C of finishing temperature, control temperature on cooling table after rolling: 630 DEG C.
(5) user's heat treatment process
Steel for sucker rod raw material is after the hot upset forging of both ends, the 935 DEG C of Medium frequency induction normalizings of whole bar, and 360 DEG C of Medium frequency inductions return Fire.
Sucker rod sample after carrying out user's heat treatment, carries out Mechanics Performance Testing, and mechanical property is shown in Table 3.Referring to SY/ T5029H grade pumping rod fatigue behaviour examination criteria carries out the measurement of air conditions lower fatigue life, test result of fatigue life It is shown in Table 4.With the residual austenite content in D8advance X-ray diffractometer (XRD) quantitative measurment steel, it the results are shown in Table 5.
Tap water is carried out in laboratory, the corrosion fatigue test under 3.5% brine corrosion media environment, with reference to SY/ Fatigue behaviour examination criteria in T5029: sine wave, load ratio R=0.1 test maximum load σmax=540MPa, test frequency Rate is adjusted to 10Hz.Corrosion fatigue test in tap water media environment the results are shown in Table 6, the corrosion fatigue in brine media environment It is shown in Table 7.
Table 3
It is required that yield strength Rel, tensile strength Rm, elongation, reduction of area Z, ballistic work Aku2。
Table 4
It is fatigue life, secondary
Standard requirements > 1 × 106
Embodiment 1 > 2 × 106
Embodiment 2 > 2 × 106
Embodiment 3 > 2 × 106
Comparative example > 2 × 106
Table 5
Retained austenite volume content, %
Embodiment 1 7.8
Embodiment 2 7.6
Embodiment 3 8.0
Comparative example 3.1
Table 6
It is fatigue life, secondary
Embodiment 1 519147
Embodiment 2 527124
Embodiment 3 481810
Comparative example 272219
Table 7
By table 3, table 4 test result it is found that the embodiment of the present invention is compared with comparative example, tough, plasticity is not much different, fatigue Service life can also meet > 1 × 106Secondary standard requirements.
The test result of table 5 show the present invention than in comparative example steel containing the retained austenite of higher amount.
Corrosion fatigue test under corrosive medium of table 6, table 7 the result shows that, the present invention has obviously compared with comparative example sample Advantage.
Fig. 3 is the pattern of corrosion fatigue fracture of the present invention, and Fig. 4 is the pattern of comparative example corrosion fatigue fracture, as seen from the figure, For fracture apperance of the present invention mainly based on transgranular fracture, comparative example fracture apperance is mainly based on grain boundary fracture.Test result table It is illustrated in corrosive medium environment, crack growth rate of the invention is lower than comparative example, has better corrosion fatigue resistant performance.

Claims (3)

1. a kind of H grade pumping rod, which is characterized in that it is contained in terms of mass percent score with the chemical component of steel: C:0.12- 0.16%, Si:1.4-1.6%, Mn:0.90-1.10%, Cr:1.8-2.0%, Mo:0.08-0.12%, Nb:0.035- 0.055%, Ti:0.01-0.03%, B:0.001-0.003%, Al:0.020-0.040%, P :≤0.020%, S :≤ 0.015%, surplus is iron and inevitable impurity.
2. sucker rod according to claim 1, which is characterized in that the preparation method specific step and parameter of sucker rod is such as Under:
1) smelt: 210 tons of top and bottom complex blowing formula converter smeltings, converter terminal control P≤0.010wt%, C:0.04~0.08wt%； Tapping temperature is by 1670~1690 DEG C of controls；Steel per ton is added AlMnFe4.0kg deoxidation when tapping, and to Si, Mn, Cr, Mo and Nb carries out ingredient initial adjustment；Using slag-stopping tapping, when tapping, 2.5~4Kg of binary synthetic slag was added in steel per ton；
2) refine: molten steel arrive at a station after according to wrap in scoriform condition add aluminum shot, arrive at a station after blowing Ar sample, determine oxygen；Using synthetic slag slag making, The quantity of slag keeps white slag and reducing atmosphere by 1.6~2.2 tons of controls, refining process；Trimming is carried out, ferrotianium tune is then added Ti is eventually adding ferro-boron tune B；Later, Si-Ca line 300m/ furnace, soft argon blowing time >=10min are fed；
3) it continuous casting: is cast using full guard；Using band dam tundish, high alkalinity coverture is used；Crystallizer uses pre-melted type Granular protecting cinder carries out electromagnetic agitation；The molten steel temperature in tundish degree of superheat: 20~35 DEG C, 180mm × 180mm square billet, work is drawn 1.3~1.6m/min of speed；Slab is into burial pit, slow cooling time >=24 hour；
4) roll: bar continuous rolling production line is rolled into φ 16mm~φ 35mm specification sucker rod round steel；It is carried out in the operation of rolling Controlled rolling, control cooling；1100~1150 DEG C of start rolling temperature；850 DEG C~900 DEG C of finishing temperature, upper cold bed temperature is controlled after rolling Degree: 600 DEG C~700 DEG C；
5) it is heat-treated: after the hot upsetting of head, 920~940 DEG C of Medium frequency induction normalizings of whole bar, 350~400 DEG C of Medium frequency induction tempering.
3. sucker rod according to claim 1, which is characterized in that the sucker rod performance meets, yield strength Rel >= 795MPa, tensile strength Rm >=965MPa, elongation A200>=10%, reduction of area Z >=45%, ballistic work Aku2≥60J。
CN201910520756.1A 2019-06-14 2019-06-14 A kind of H grade pumping rod and preparation method thereof Pending CN110273101A (en)

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CN114790532A (en) * 2022-06-22 2022-07-26 江苏省沙钢钢铁研究院有限公司 Alloy corrosion-resistant steel bar and preparation method thereof
CN115449695A (en) * 2022-08-22 2022-12-09 包头钢铁（集团）有限责任公司 Production method of 1000 MPa-grade high-strength sucker rod round steel

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* Cited by examiner, † Cited by third party
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CN114592154A (en) * 2022-01-21 2022-06-07 马鞍山钢铁股份有限公司 Production method of 10.9-grade niobium microalloyed cold forging steel
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CN115449695A (en) * 2022-08-22 2022-12-09 包头钢铁（集团）有限责任公司 Production method of 1000 MPa-grade high-strength sucker rod round steel
CN115449695B (en) * 2022-08-22 2023-09-26 包头钢铁（集团）有限责任公司 Production method of 1000 MPa-level high-strength round sucker rod steel

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Application publication date: 20190924