CN100545290C - A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from is with steel and production method - Google Patents
A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from is with steel and production method Download PDFInfo
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- CN100545290C CN100545290C CNB2007101060122A CN200710106012A CN100545290C CN 100545290 C CN100545290 C CN 100545290C CN B2007101060122 A CNB2007101060122 A CN B2007101060122A CN 200710106012 A CN200710106012 A CN 200710106012A CN 100545290 C CN100545290 C CN 100545290C
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Abstract
A kind of production method of exempting from the thermal treatment ultra-fine crystal D grade sucker rod sucker rod with steel belongs to the structure iron technical field.Solve ultra-fine grained ferrite pearlite type pumping rod and substituted the problem that has the D grade sucker rod steel now.Chemical ingredients is C0.25～0.35%, Si0.60～0.90%, and Mn1.15～1.35%, Nb0.020～0.035%, surplus Fe or C0.27～0.38%, Si0.60～0.90%, Mn1.35～1.60%, P, S: be≤0.025%, surplus Fe.Carry out after 1150～1200 ℃ of the strand heating thick, in and finish rolling, 1050～1150 ℃ of roughing temperature, the accumulative total draft is greater than 50%, in roll 880～950 ℃ of temperature, 750～800 ℃ of finishing mill start rolling temperatures, 650～750 ℃ of finishing temperatures, accumulative total draft＞60%; Roll 0.5～25 ℃/s of postcooling speed.
Description
Technical field
Type of the present invention relates to a kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from steel and production method, belongs to the structure iron technical field.
Background technology
Sucker rod is the key part of oil field deep well strike the oil.Well depth increases in order to satisfy, the output expansion, and sucker rod with the requirement that material improves day by day, has been developed type materials such as glass reinforced plastic, stainless steel, carbon fibre, bainitic steel.At present, widespread usage be the D grade sucker rod steel, at D level bar (σ
s〉=600MPa, σ
b〉=800MPa, δ
200〉=12, σ
-1In 〉=340MPa) the manufacturing processed, mainly use the 20CrMo heat-treated steel, after modifier treatment, make finished product.For satisfying the thermal treatment process conditional request, improve hardening capacity and temper resistance, this kind contains valuable alloying element, the production cost height, complex process causes waste product easily in the heat treatment process, waste energy.Several years ago, certain Iron And Steel Company had once developed 30MnSiV ferritic-pearlitic type D grade pumping rod steel, owing to removed heat treatment step from, was subjected to the welcome of sucker rod manufacturing firm deeply, was called as real material-type steel.But this steel is mainly by the solution strengthening of alloying element and the precipitation strength of V, two kinds of strengthening mechanisms are little to the fatigue strength contribution, because of impelling strength and fatigue strength are lower, repeatedly take off the bar accident of breaking in actual the use, cause enormous economic loss, now substantially withdraw from the market.Because of the present circumstance, oilfield applications is urgently expected the exploitation of new material-type steel for sucker rod.
Summary of the invention
The present invention is used to overcome the defective of prior art and provides a kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from steel and production method, this product is by optimizing composition and production method, obtain ultra-fine grained ferrite pearlite type tissue, improved the intensity and the toughness of steel, and then alternative sucker rod mates bad non-hardened and tempered steel with heat-treated steel and obdurability.
The alleged problem of the present invention is that following technical scheme solves:
A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod steel of exempting from, special feature is that chemical ingredients is as follows according to the weight percent proportioning: C:0.25～0.35%, Si:0.60～0.90%, Mn:1.15～1.35%, P :≤0.025%, S :≤0.025%, Nb:0.020～0.035%, surplus Fe.
The above-mentioned thermal treatment ultra-fine crystal D grade sucker rod sucker rod steel of exempting from, described chemical ingredients proportion optimization is as follows: C:0.27～0.34%, Si:0.70～0.85%, Mn:1.20～1.34%, P :≤0.020%, S :≤0.020%, Nb:0.023～0.033%, surplus Fe.
A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod steel of exempting from, special feature is: chemical ingredients is as follows according to the weight percent proportioning: C:0.27～0.38%, Si:0.60～0.90%, Mn:1.35～1.60%, P :≤0.025%, S :≤0.025%, surplus Fe.
The above-mentioned thermal treatment ultra-fine crystal D grade sucker rod sucker rod steel of exempting from,, described chemical ingredients proportion optimization is as follows: C:0.29～0.35%, Si:0.73～0.85%, Mn:1.40～1.55%, P :≤0.020%, S :≤0.020%, surplus Fe.
The above-mentioned thermal treatment ultra-fine crystal D grade sucker rod sucker rod steel of exempting from, the mechanical property technical indicator is as follows:
Tensile strength: σ
b〉=800MPa,
Yield strength: σ
s〉=600MPa,
Unit elongation: δ
200〉=12,
Fatigue strength: σ
-1〉=340MPa.
The above-mentioned production method of exempting from the ultra-fine brilliant steel for sucker rod of thermal treatment, it comprises ironmaking successively, steel-making, rolling process, the processing parameter control of described rolling process is as follows: strand is heated to 1150～1200 ℃ in process furnace after, carry out roughing, in roll and finish rolling, roughing district temperature is controlled at 1050～1150 ℃, the accumulative total draft is greater than 50%, in roll the district temperature be controlled at 880～950 ℃, in shut out the intermediate blank of coming and enter finishing mill through water-cooled, the start rolling temperature of finishing mill is 750～800 ℃, the finishing temperature of finishing mill is 650～750 ℃, and the accumulative total draft rolls the postcooling speed control at 0.5～25 ℃/s greater than 60%.
One of characteristics of the present invention have provided the chemical ingredients prescription of optimizing of exempting from the ultra-fine brilliant steel for sucker rod of thermal treatment, two of characteristics are at thermal deformation process, adopt ultra-fine crystal technique, by deformation and phase transformation coupled method, rationally control the deforming technique parameter, bring out ultra-fine ferrite and separate out in deformation process, carbide is modification in deformation process, finally obtains ultra-fine ferrite and adds pearlitic structure.Performance Detection shows, can reach the standard-required of D grade pumping rod high-strength steel fully according to its mechanical performance index of pumping rod of stoicheiometry of the present invention and processing parameter production, every performance index all are better than currently available products, and the ductile-brittle transition temperature of product reduces greatly.
Embodiment
Make high-strength pumping rod steel prescription for two kinds that the invention provides, carbon, Gao Meng in the employing, or add trace alloying element Nb.Main alloy element function analysis in steel is as follows in the prescription of these two kinds of steel:
1.Mn:Mn mainly play solution strengthening, usually adopt and reduce C content, increase Mn content, to reach the too fast purpose of the unlikely decline of toughness when improving intensity.Mn also has the effect that reduces transformation temperature, helps grain refining, so Mn is indispensable element.But when its content is too much, transformation temperature is descended too much, bainite will occur in the tissue, reduce toughness.One: C 0.25～0.35% in two schemes of the present invention, Mn 1.15～1.35%, and Nb 0.020～0.035%; Its two: C 0.27～0.38%, and Mn 1.35～1.60%, by reasonable control carbon, manganese content, adds and adopts ultra-fine crystal technique to be rolled, and makes intensity and toughness keep good coupling.
2.Nb:Nb also be trace alloying element, adding Nb is the important improvement of one of them prescription of the present invention.1. to the influence of microstructure: niobium can crystal grain thinning, improves the grain coarsening temperature.The carbonitride particle of undissolved niobium is distributed on the austenite grain boundary, can hinder steel growing up at when heating austenite crystal; The carbon niobium nitride is separated out and is postponed austenitic recrystallize when rolling, in rolling final stage, has promoted the distortion of flat crystal grain, thereby has caused very thin ferrite crystal grain; In γ → α phase transformation INTERPHASE CARBIDE PRECIPITATION taking place, form very tiny alloy carbide, plays the precipitation strength effect.2. to the influence of mechanical property: add yield strength and impelling strength that 0.005～0.05% niobium can improve steel in the low alloy steel, reduce its brittle transition temperature, and improve its welding property.The steel effect higher to manganese content is more remarkable.In conjunction with the controlled rolling technology, the intensity of steel and toughness are improved greatly.
3.Si: when steel-making generally as reductor, but also can be used as alloying element.Si enters ferrite and plays the solution strengthening effect, the tensile strength and the less degree that can significantly improve steel improve yield strength, but reduce toughness, the plasticity of steel simultaneously to a certain extent, Si increases the actual effect susceptibility of steel simultaneously, and can improve the resistance to corrosion and the oxidation-resistance property of steel.
The characteristics of production method of the present invention are embodied in steel rolling process, its crystal grain thinning is rolling by austenitic recrystallize, the critical austenitic area large deformation amount of finish rolling is rolling and roll the back rationally controlled chilling speed carry out.But main refinement means are that the critical austenitic area large deformation amount of finish rolling is rolling.Its mechanism is at first high temperature austenite crystal grain to be carried out refinement by the austenitic recrystallize of rough rolling step; Rolling by the critical austenitic area large deformation amount of finish rolling then, deformation inducedly go out the superfine ferrite crystal grain.Because under the effect of stress, austenite raises to the temperature of ferritic transformation, so ferritic transformation amount increases.Constantly do not separate out and increase with ferritic and change austenitic average carbon content, but the distribution of the carbon that diffusion was got rid of when ferrite was separated out is also inhomogeneous, but it is highly enriched at tiny ferrite interface with do not change austenitic interface, in distortion and in the process of cooling after rolling, these carbon-rich zones are separated out corynebacterium or particulate state cementite, make the carbide modification, finally obtain ultra-fine ferrite and add pearlitic structure, average grain size can be controlled in 2～6 μ m, thereby reaches intensity and the flexible purpose that improves steel.
Several embodiment below are provided:
Chemical ingredients is weight percent proportioning such as following table according to quantity:
Steel for sucker rod of the present invention is smelted according to above-mentioned chemical ingredients proportioning, through technologies such as hot metal pretreatment, converter smelting, external refining, continuous casting protection casting, enters rolling process.The control of the processing parameter of described rolling process is as follows: strand is heated to 1150～1200 ℃ in process furnace after, carry out roughing, in roll and finish rolling.Roughing district temperature is controlled at 1050～1150 ℃, and the accumulative total draft is greater than 50%, and is rolling in the austenite recrystallization district to guarantee roughing; In roll rolling routinely carrying out, in roll the district temperature be controlled at 880～950 ℃, in shut out the intermediate blank of coming and enter finishing mill through water-cooled, the start rolling temperature of finishing mill is 750～800 ℃, the finishing temperature of finishing mill is 650～750 ℃, the accumulative total draft is greater than 60%, to guarantee that finish rolling is at critical austenitic area (Ar
3Near) be rolled; Roll the postcooling speed control at 0.5～25 ℃/s.Be rolled by above-mentioned processing parameter, the finished product are organized as ultra-fine ferrite and add perlite, and average grain size is 2～6 μ m.
Its physicals technical indicator is:
Tensile strength: σ
b〉=800MPa,
Yield strength: σ
s〉=600MPa,
Unit elongation: δ
200〉=12,
Fatigue strength: σ
-1〉=340MPa.
Claims (5)
1. exempt from the production method that the thermal treatment ultra-fine crystal D grade sucker rod sucker rod is used steel for one kind, its chemical ingredients components by weight percentage is, C:0.25～0.35%, Si:0.60～0.90%, Mn:1.15～1.35%, P :≤0.025%, S :≤0.025%, Nb:0.020～0.035%, surplus Fe, it comprises ironmaking successively, steel-making, rolling process, it is characterized in that: the processing parameter control of described rolling process is as follows: strand is heated to 1150～1200 ℃ in process furnace after, carry out roughing, in roll and finish rolling, roughing district temperature is controlled at 1050～1150 ℃, the accumulative total draft is greater than 50%, in roll district's temperature and be controlled at 880～950 ℃, in shut out the intermediate blank of coming and enter finishing mill through water-cooled, the start rolling temperature of finishing mill is 750～800 ℃, the finishing temperature of finishing mill is 650～750 ℃, and the accumulative total draft is greater than 60%; Roll the postcooling speed control at 0.5～25 ℃/s.
2. the production method of exempting from the thermal treatment ultra-fine crystal D grade sucker rod sucker rod with steel according to claim 1, it is characterized in that: described chemical ingredients components by weight percentage is, C:0.27～0.34%, Si:0.70～0.85%, Mn:1.20～1.34%, P :≤0.020%, S :≤0.020%, Nb:0.023～0.033%, surplus Fe.
3. exempt from the production method that the thermal treatment ultra-fine crystal D grade sucker rod sucker rod is used steel for one kind, its chemical ingredients according to the weight percent proportioning is, C:0.27～0.38%, Si:0.60～0.90%, Mn:1.35～1.60%, P :≤0.025%, S :≤0.025%, surplus Fe, it comprises ironmaking successively, steel-making, rolling process is characterized in that: the processing parameter control of described rolling process is as follows: strand is heated to 1150～1200 ℃ in process furnace after, carry out roughing, in roll and finish rolling, roughing district temperature is controlled at 1050～1150 ℃, accumulative total draft greater than 50%, in roll the district temperature be controlled at 880～950 ℃, in shut out the intermediate blank of coming and enter finishing mill through water-cooled, the start rolling temperature of finishing mill is 750～800 ℃, and the finishing temperature of finishing mill is 650～750 ℃, and the accumulative total draft is greater than 60%; Roll the postcooling speed control at 0.5～25 ℃/s.
4. the production method of exempting from the thermal treatment ultra-fine crystal D grade sucker rod sucker rod with steel according to claim 3, it is characterized in that: described chemical ingredients components by weight percentage is, C:0.29～0.35%, Si:0.73～0.85%, Mn:1.40～1.55%, P :≤0.020%, S :≤0.020%, surplus Fe.
According to claim 1 or 2 or the 3 or 4 described thermal treatment ultra-fine crystal D grade sucker rod sucker rods of exempting from the production methods of steel, it is characterized in that: the described thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from the mechanical property technical indicator of steel is:
Tensile strength: σ
b〉=800MPa,
Yield strength: σ
s〉=600MPa,
Unit elongation: δ
200〉=12,
Fatigue strength: σ
-1〉=340MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101060122A CN100545290C (en) | 2007-05-29 | 2007-05-29 | A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from is with steel and production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101060122A CN100545290C (en) | 2007-05-29 | 2007-05-29 | A kind of thermal treatment ultra-fine crystal D grade sucker rod sucker rod of exempting from is with steel and production method |
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|---|---|
| CN101109058A CN101109058A (en) | 2008-01-23 |
| CN100545290C true CN100545290C (en) | 2009-09-30 |
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| CN108526221A (en) * | 2018-06-25 | 2018-09-14 | 中冶赛迪技术研究中心有限公司 | A kind of mild steel continuous casting and rolling production line and its production technology |
| CN109112392B (en) * | 2018-07-17 | 2020-11-20 | 张家港宏昌钢板有限公司 | TMCP (thermal mechanical control processing) type weather-proof bridge steel plate with high strength, toughness and fatigue performance and preparation method thereof |
| CN113528931B (en) * | 2021-05-26 | 2022-06-10 | 唐山钢铁集团高强汽车板有限公司 | Steel strip and production method thereof |
| CN115369322A (en) * | 2022-08-26 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Production method of 900 MPa-grade high-strength sucker rod round steel containing rare earth |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832757A (en) * | 1987-07-08 | 1989-05-23 | Amax Inc. | Method for producing normalized grade D sucker rods |
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2007
- 2007-05-29 CN CNB2007101060122A patent/CN100545290C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4832757A (en) * | 1987-07-08 | 1989-05-23 | Amax Inc. | Method for producing normalized grade D sucker rods |
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