CN102517515A - Phi 177.8*9.19 seamless steel pipe with high steel grade for petroleum and manufacturing method - Google Patents
Phi 177.8*9.19 seamless steel pipe with high steel grade for petroleum and manufacturing method Download PDFInfo
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Abstract
The invention provides a phi 177.8*9.19 seamless steel pipe with high steel grade for petroleum. The material of the seamless steel pipe comprises the following chemical components according to weight percent: 0.27 to 0.31 of C, 0.17 to 0.35 of Si, 1.35 to 1.45 of Mn, lower than 0.02 of P, lower than 0.007 of S, no more than 0.025 of P + S, no more than 0.25 of Ni, no more than 0.25 of Cr, no more than 0.10 of Mo, 0.01 to 0.05 of V, no more than 0.25 of Cu and no lower than 0.005 of Alt. Meanwhile, the invention provides a manufacturing method of the phi 177.8*9.19 seamless steel pipe with high steel grade for the petroleum. The phi 177.8*9.19 seamless steel pipe with high steel grade for the petroleum and the manufacturing method have the effects that the process of the manufacturing procedure of the seamless steel pipe is convenient to execute at a site, the stability of the production process is strong, the production efficiency is high, and a larger market space is provided; and especially, the trade barriers of American and European states can be broken, and the phi 177.8*9.19 seamless steel pipe with high steel grade for the petroleum enters the international market.
Description
Technical field
The Φ 177.8*9.19 high-steel level oil that the present invention relates to a kind of API of satisfying and 2 requirements of D010 appendix is with weldless steel tube and method of manufacture.
Background technology
Since the worldwide financial crisis in the end of the year 2008, developed into the intensified competition of real economy gradually.The market competition of weldless steel tube is all the more fierce.Particularly American-European countries is two anti-, has increased the weight of the severity of the competition of domestic weldless steel tube more.In such market competition; Be badly in need of weldless steel tube high-quality low-cost, that performance index are met the need of market that developing target market needs; Domestic petroleum uses seamless tube market all to adopt the CrMo steel to be raw material to this grade of steel at present; This material capability is stable but cost is higher, for market at home has more competitive power.The decision exploitation is a kind of can satisfy performance requriements, the material product that price is cheap again.
Summary of the invention
The purpose of this invention is to provide a kind of Φ 177.8*9.19 high-steel level oil with weldless steel tube and method of manufacture,, reduced 900-1100 unit than domestic with grade of steel production tube price simultaneously to satisfy the requirement of API and D010 appendix 2.
For realizing above-mentioned purpose; The technical scheme that the present invention adopts provides a kind of Φ 177.8*9.19 high-steel level oil and uses weldless steel tube, and the chemical ingredients of this weldless steel tube material % by weight is: C 0.27-0.31, Si 0.17-0.35, Mn 1.35-1.45, P＜0.02, S＜0.007, P+S≤0.025, Ni≤0.25, Cr≤0.25, Mo≤0.10, V 0.01-0.05, Cu≤0.25, Alt>=0.005.
The method of manufacture of a kind of Φ 177.8*9.19 high-steel level oil with weldless steel tube is provided simultaneously.
When effect of the present invention adopted above composition that the technology tempering temperature of the manufacturing processed of weldless steel tube is fluctuateed in 40 ℃ of scopes, all more than 680MPa, ys was between 589-608MPa for tensile strength; Hardness is at 18-21HRC, the steady state of ballistic work between 78-96J, and it is convenient that this technology is carried out at the scene; Stable processing technique property is strong, and production efficiency is high, and the bigger market space is provided; Particularly can wash the trade barrier of USA and Europe country open, come into the world market.This weldless steel tube material property each item index all meets or exceeds API and D010 appendix 2 standard-requireds.
Description of drawings
Fig. 1 is the sensitivity rational curve synoptic diagram of weldless steel tube of the present invention to the tempering temperature fluctuation.
Embodiment
In conjunction with accompanying drawing Φ 177.8*9.19 high-steel level oil of the present invention is explained with weldless steel tube and method of manufacture.Said high grade of steel is a Φ 177.8*9.19mmL80 grade of steel.
Guarantee that the weldless steel tube product can satisfy API and D010 appendix 2 standard-requireds; Corresponding product performance should be able to be guaranteed; Fully analyzing production process and product performance situation, the ys that guarantee product is between 552-655MPa, and tensile strength is more than 655MPa; Hardness is no more than 23HRC, and ballistic work is greater than 14J.
Φ 177.8*9.19mm L80 steel level oil of the present invention is used weldless steel tube, and the chemical ingredients of this weldless steel tube material % by weight is: C 0.27-0.31, Si 0.17-0.35, Mn 1.35-1.45, P＜0.02, S＜0.007, P+S≤0.025, Ni≤0.25, Cr≤0.25, Mo≤0.10, V 0.01-0.05, Cu≤0.25, Alt>=0.005.
Φ 177.8*9.19mmL80 steel level oil may further comprise the steps with the method for manufacture of weldless steel tube:
1. steel-making
By the chemical ingredients of above-mentioned weldless steel tube material, adopt high power electric arc furnace to smelt, through in molten steel, adding the lime making foamed slag of 360ml/4N-HCl high reactivity degree, fully adsorb harmful element P, S in the molten steel; Adopt ladle furnace refining, vacuum outgas, Control and Inclusion Removal technology, carry out external refining, the temperature of superheat through molten steel is controlled at 15-30 ℃, and casting speed is a PM 1-1.2 rice, and cooling water inflow is 585m
3/ h, final continuous casting becomes circular pipe blank;
2. steel pipe thermal treatment
Above-mentioned circular pipe blank is heated to 930 ± 10 ℃ in the quenching process furnace, guarantee during quenching steel pipe fast rotational hardening liquid the steel pipe surfaces externally and internally evenly in spray with outside pouring; In the tempering process furnace, be heated to 640 ± 10 ℃ then, carry out tempering,, spray mark, japanning at last, process weldless steel tube through non-destructive test(ing)(NDT), hydrostatic test.Below be example with Φ 177.8*9.19mm L80 grade of steel, in conjunction with each chemical element performance impact is detailed the material implementation procedure.
Carbon (C): the increase of carbon amount can make the surrender of material and tensile strength raise, but plasticity and impact property reduce.Therefore the carbon amount is confirmed according to the intensity and the flexible situation of steel pipe.
Silicon (Si): in steelmaking process, add silicon as reductive agent and reductor, killed steel contains the silicon of 0.15-0.30%.
Manganese (Mn): the Mn solid solution is in ferritic and austenite, and in phase transition process, Mn and Fe form sosoloid, improve the intensity and the hardness of steel; Because Mn has reduced the speed of phase transformation in critical transition temperature and the steel in steel, improved the hardening capacity of steel, thereby improved the mechanical property of modifier treatment sorbite steel in addition; Mn element another vital role in this material is to improve the stability of austenite structure; We discover that Mn element and S form the higher MnS of fusing point, have avoided the appearance of FeS on the crystal boundary, have eliminated the red brittleness of steel.Therefore, we also will consider the content of element S.
Vanadium (V): the scope that can know L80 grade of steel ys by standard code is: 552--655MPa, deviation range requires less, the difficult control in the production scene.Therefore in design; Considered of the contribution of various strengthening mechanisms to ys, grain refining reinforcement, precipitation strength, solution strengthening is the most direct; Effect is the most tangible; We contrast multiple elements such as having considered C, Mn, Cr, Mo, V the influence of steel are compared, though the adding of C, Mn element can improve intensity, can bring the reduction of toughness and corrosion resistance; Though the adding of Cr, Mo element can improve the comprehensive mechanical performance of steel, on cost, improved 20%; Therefore think that the interpolation of V has extremely excellent economy.But the maximum characteristics of V are refined crystalline strengthening and precipitation strength: the correlative factor grain fineness that influences ys; Be to improve intensity and flexible basic demand; But carbon manganese steel is through controlled rolling and heat-treating methods crystal grain thinning; Xiang Gangzhong adds after the trace elements such as V again, and the grain fineness number of steel further diminishes, and intensity can further improve.Being added in of V forms VC in the steel, the precipitation strength effect of VC in ferritic has contribution to ys.We adopt same production technique, and are variant at V content, and the material that other constituent contents are constant is done experiment, and experimental result is as shown in table 1 below:
Table 1
| V content (%) | Grain fineness number (level) | Ys (Mpa) |
| 0 | 6.0-6.5 | 540-555 |
| 0.01-0.02 | 7.0-7.5 | 552-574 |
| 0.03-0.05 | 8.0-8.5 | 580-620 |
Therefore, when V content during at 0.03-0.05%, yield strength value is the most stable.
P, S:P and S are impurity elements.Too high P and S content can sharply reduce steel strength, and it is become fragile.For improving toughness and solidity to corrosion, reduce its content as far as possible, S and Mn element interact and generate MnS in the steel, suppress the generation of FeS on the crystal boundary, reduce red brittleness, therefore take all factors into consideration the economy and the performance of tubing, regulation P＜0.020%, S＜0.007%.
In conjunction with the on-the-spot process characteristic of our unit, and use for reference the experience of using material both at home and abroad, design material chemical ingredients of the present invention and see table 2
Table 2
Φ 177.8*9.19mmL80 steel level oil of the present invention is achieved in that with the method for manufacture of weldless steel tube
1 steel-making
Adopt 75 tons of ultra-high power electric arc furnaces to smelt,, fully adsorb harmful element P in the molten steel, S etc. through in molten steel, adding the lime making foamed slag of 360ml/4N-HCl high reactivity degree; Adopt ladle furnace refining, vacuum outgas, Control and Inclusion Removal technology, carry out external refining, the temperature of superheat through molten steel is controlled at 15-30 ℃, and casting speed is a PM 1-1.2 rice, and cooling water inflow is 585m
3/ h, final continuous casting becomes circular pipe blank.
2 tubulations
A. rolling technique
The ring-like heating of pipe blank stove of computer controlled automatic furnace temperature is accurately controlled the pipe temperature, guarantees that pipe rolls into the stable and dimensional precision of performance behind the pipe.
Quality for all even surfaces externally and internallies of guaranteeing wall thickness is provided with cold centering and dephosphorize by high pressure water.
Decide the reducing pass design and guarantee tube outer diameter and wall thickness accuracy.
B. technology controlling and process
The ring furnace Heating temperature is 1280 ℃, and guarantees that the pipe temperature is even.
The hollow billet wall thickness deviation that the tapping machine unit shuts out should be in ± 8%, for rolling hollow forging and production tube have been created the good premise condition.
The ASSEL tube rolling mill is accurately rolling, removes tube end, and whole thickness of steel pipe inequality be no more than ± and 5%.
The size-reducing mill group guarantees the external diameter and the wall thickness accuracy of steel pipe, and the outside diameter tolerance of steel pipe is 0-0.5%D.
The aligning unit guarantees that tube bending degree index is less than 1.5mm/m.
3 steel pipe thermal treatment and processing
A. heat treatment technics
Heat-treatment production line carries out modifier treatment to guarantee the performance of steel pipe through accurate control quenching furnance and furnace temperature to steel pipe.Simultaneously, steel pipe finally is organized as tempered sorbite, guarantees that steel pipe has good comprehensive mechanical performance.
Heat treatment process parameter: 930 ± 10 ℃ of quenchings, 640 ± 10 ℃ of high temperings guarantee the steel pipe fast rotational during quenching, and guarantee that the steel pipe surfaces externally and internally sprays and outer pouring in even.
B. the working accuracy of steel pipe screw thread is technological
Screw thread processing: adopt the full-automatic numerical control machine for threading
Box cupling processing: adopt numerical control box cupling machine for threading and hydraulic pressure box cupling screw-on machine
Accuracy of screw machining: can reach 1/2 of API standard code scope
Car silk: thread size tolerance: 0.060in-0.068in, standoff ± 3.175mm, length of thread ± 3.175mm.
Box cupling is twisted and to be connect: the tight back of machine guarantee the J value be controlled at+3.175mm ,-the 3.175mm scope in.
The water test: steady time >=5 second.
Through the reasonable process of above-mentioned steel pipe manufacturing and the utilization of gordian technique, make production tube have good comprehensive mechanical performance, concrete division is following:
Chemical ingredients
The chemical ingredients check analysis is the result show, steel pipe has the low characteristics of harmful element such as composition is even, phosphorus sulphur.Meet the requirement of API SPEC 5CT and D010 appendix 2 fully, satisfied the composition design requirements, thereby have favorable tissue and performance provides precondition for tubing.
Metallographic structure
The statistics of high power metallographic examination shows that the microstructure of L80 class steel pipe is a tempered sorbite, and homogeneous microstructure, crystal grain is tiny, nonmetal inclusion content is low.
Mechanical property
On the tubing after the thermal treatment, per 20 draw one group of stretching, impact and hardness sample tests, and the assay statistics of each batch is seen table 3 (is example with Φ 177.8*9.19mm).
Table 3
Eight batches of ys test bit have been got aborning; Temperature exists ± 20 ℃ fluctuation in the temper furnace at that time; Do the ys test with the pipe in three temperature provinces respectively; Can know that by test and Fig. 1 this material is not strong to the susceptibility of tempering temperature fluctuation, test bit is seen table 4
Table 4
The working accuracy of screw thread
Actual measurement L80 grade of steel steel pipe box cupling and body screw thread, its working accuracy is high, and each item index all is controlled at 1/2nd of API franchise.Embodying two the most important index-thread tapers of steel pipe thread quality characteristic and the concrete parameter of standoff is:
Standoff: all take off data is all between ± 1 button.
Thread taper: the tapering of box cupling and pipe thread is between 0.062-0.066in.
This kind material of the present invention is utilized and is optimized technology, the effect that give full play to alloying element V crystal grain thinning, improves resistance to tempering, improves material hardening capacity; This element and C combine to form VC; Be the strengthening phase in this steel, improved matrix hardness, and guarantee stable performance; S, the high sharply reduction of P content steel strength, and it is become fragile; For improving toughness and solidity to corrosion, reduce its content as far as possible; Consider the economy of tubing simultaneously, regulation P＜0.020%, S＜0.007%.We make material homogeneous microstructure after thermal treatment to the scientific and reasonable proportioning of various chemical elements, stable performance, and comprehensive mechanical performance is good.
Particularly this material is guaranteed the stability of production process in process of production.Promptly when some fluctuation of thermal treatment process control, can not cause the steel tube performance skew, improve the production flexibility of product.
Economic analysis
Cooperate advanced technology controlling and process means to make an experiment with this material, the ys of performance index is between 552-655MPa in the standard, and tensile strength is more than 655MPa, and hardness is no more than 23HRC.Adopt above composition, when the technology tempering temperature of weldless steel tube manufacturing processed fluctuateed in 620-660 ℃ of scope, tensile strength was all more than 680MPa; Ys is between 589-608MPa, and hardness is at 18-21HRC, the steady state of ballistic work between 78-96J; It is convenient that this technology is carried out at the scene; Production efficiency is high, the technological process temperature, and an inspection qualification rate is high.Make weldless steel tube material of the present invention on raw material, compare cost and reduced 850-1050 unit, reduced 900-1100 unit with grade of steel production tube price than domestic with domestic material with grade of steel.The bigger market space is provided.
Claims (2)
1. a Φ 177.8*9.19 high-steel level oil is used weldless steel tube, and the chemical ingredients of this weldless steel tube material % by weight is: C 0.27-0.31, Si 0.17-0.35, Mn 1.35-1.45, P＜0.02, S＜0.007, P+S≤0.025, Ni≤0.25, Cr≤0.25, Mo≤0.10, V 0.01-0.05, Cu≤0.25, Alt>=0.005.
2. a Φ 177.8*9.19 high-steel level oil is with the method for manufacture of weldless steel tube, and this method may further comprise the steps:
1. steel-making
By the chemical ingredients of above-mentioned weldless steel tube material, adopt high power electric arc furnace to smelt, through in molten steel, adding the lime making foamed slag of 360ml/4N-HCl high reactivity degree, fully adsorb harmful element P, S in the molten steel; Adopt ladle furnace refining, vacuum outgas, Control and Inclusion Removal technology, carry out external refining, within above-mentioned scope, the temperature of superheat through molten steel is controlled at 15-30 ℃ with the molten steel chemical Composition Control, and casting speed is a PM 1-1.2 rice, and cooling water inflow is 585m
3/ h, final continuous casting becomes circular pipe blank;
2. steel pipe thermal treatment
Above-mentioned circular pipe blank is heated to 930 ℃ ± 10 ℃ in the quenching process furnace, guarantee during quenching steel pipe fast rotational hardening liquid the steel pipe surfaces externally and internally evenly in spray with outside pouring; In the tempering process furnace, be heated to 640 ℃ ± 10 ℃ then, carry out tempering,, spray mark, japanning at last, process weldless steel tube through non-destructive test(ing)(NDT), hydrostatic test.
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| CN 201110451753 CN102517515B (en) | 2011-12-29 | 2011-12-29 | Phi 177.8*9.19 seamless steel pipe with high steel grade for petroleum and manufacturing method |
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| CN102517515B CN102517515B (en) | 2013-09-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962830A (en) * | 2015-07-29 | 2015-10-07 | 山东墨龙石油机械股份有限公司 | Manufacturing method of seamless steel pipe |
| CN108798551A (en) * | 2018-08-01 | 2018-11-13 | 天津钢管集团股份有限公司 | The surface pipe screw-thread joint structure of big outer diameter thin-walled thickness |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998000570A1 (en) * | 1996-07-02 | 1998-01-08 | The Timken Company | Induction hardened microalloy steel having enhanced fatigue strength properties |
| CN1939656A (en) * | 2005-09-30 | 2007-04-04 | 宝山钢铁股份有限公司 | Production of L80-13Cr oil casings |
| CN101481995A (en) * | 2008-01-11 | 2009-07-15 | 江苏嘉宝科技制管有限公司 | High steel level petroleum casing pipe and oil pipe manufacturing process |
| CN101993991A (en) * | 2010-11-20 | 2011-03-30 | 衡阳华菱钢管有限公司 | Heat treatment method for low-carbon manganese steel tubes |
-
2011
- 2011-12-29 CN CN 201110451753 patent/CN102517515B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998000570A1 (en) * | 1996-07-02 | 1998-01-08 | The Timken Company | Induction hardened microalloy steel having enhanced fatigue strength properties |
| CN1939656A (en) * | 2005-09-30 | 2007-04-04 | 宝山钢铁股份有限公司 | Production of L80-13Cr oil casings |
| CN101481995A (en) * | 2008-01-11 | 2009-07-15 | 江苏嘉宝科技制管有限公司 | High steel level petroleum casing pipe and oil pipe manufacturing process |
| CN101993991A (en) * | 2010-11-20 | 2011-03-30 | 衡阳华菱钢管有限公司 | Heat treatment method for low-carbon manganese steel tubes |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962830A (en) * | 2015-07-29 | 2015-10-07 | 山东墨龙石油机械股份有限公司 | Manufacturing method of seamless steel pipe |
| CN108798551A (en) * | 2018-08-01 | 2018-11-13 | 天津钢管集团股份有限公司 | The surface pipe screw-thread joint structure of big outer diameter thin-walled thickness |
| CN108798551B (en) * | 2018-08-01 | 2023-09-01 | 天津钢管制造有限公司 | Surface sleeve threaded joint structure with large outer diameter and thin wall thickness |
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