CN101270438A - Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method - Google Patents
Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method Download PDFInfo
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Abstract
The invention provides an air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW), an oil casing with low yield ratio electrical resistance welding which is made of the air hardening steel and a preparation method of oil casing. The components of the air hardening steel for oil casing with low yield ratio electrical resistance welding (ERW) in weight percent comprises: 0.19 to 0.29 percent of Carbon, 0.1 to 0.4 percent of Silicon, 1.0 to 1.3 percent of Manganese, less than or equal to 0.015 percent of Phosphorus, smaller than 0.008 percent of Sulfur, 0.002 to 0.04 percent of Aluminum, 0.001 to 0.01 percent of Calcium, 0.08 to 0.14 percent of Vanadium, the remaining part is Ferrum and other inevitable purities. The air hardening steel of the chemical proportion is adopted, continuously casted to form blank, the normalizing heat treatment is carried out for the entire casing after ERW of casing, and then the oil casing with low yield ratio electrical resistance welding of the invention is fabricated out. The yield strength of the oil casing is between 379 to 552 Megapascal, the tensile strength is greater than or equal to 655 Megapascal, and the oil casing has the moderate carbon equivalent and the stable mechanical property of the entire casing.
Description
Technical field
The present invention relates to a kind of oil casing pipe steel, specifically relate to a kind of resistance welding (ERW) petroleum casing pipe normalized steel, more particularly, relate to low yield strength ratio resistance welding (ERW) petroleum casing pipe and this telescopic method for making that a kind of low yield strength ratio resistance welding (ERW) petroleum casing pipe is made with normalized steel, with this steel grade.
Background technology
Generally speaking the petroleum and natural gas exploitation produces and the supply of material according to the API normal structure with sleeve pipe.API standard code, K55 steel level oil bushing have two types of seamless tube and welded tubes.For seamless tube, welded tube has distinguishing features such as production efficiency height, dimensional precision is good, specification limit is wide, cost is low, is manufacturer and oil field user's first-selected kind therefore, is subjected to the favor in market always.But, because production difficulty height, only there is external minority producer to produce at present for K55 ERW sleeve pipe.
The K55 steel level oil bushing is a kind of high value added product.The yield strength of this casing steel must be between 379～552MPa, and tensile strength must be characterized in that the yield tensile ratio of material is low greater than 655MPa.Table 1 has been listed the K55 telescopic chemical ingredients that external Steel Plant of several families produce.
The external K55 telescopic chemical ingredients (wt%) of table 1
| C | Si | Mn | P | S | Cu | V | Nb | Ti | Al | Ca | |
| Product 1 (Britain) | 0.17- 0.22 | 0.25- 0.35 | 1.3- 1.5 | ≤ 0.025 | ≤ 0.015 | 0.1- 0.13 | 0.01- 0.024 | 0.025- 0.065 | |||
| Product 2 (Britain) | 0.33 -0.37 | 0.10- 0.35 | 1.35- 1.55 | ≤ 0.025 | ≤ 0.015 | 0.025- 0.065 | |||||
| Product 3 (U.S.) | 0.33 | 0.19 | 1.33- 1.38 | 0.011 | 0.003 | 0.12- 0.14 | 0.05- 0.06 | 0.03 |
Product 1 is lower because of carbon content, so added the deficiency that units such as V, Nb usually remedy intensity, its manufacture characteristic is need heat once more through tension reducing behind the welded tube tubulation to make the K55 sleeve pipe, therefore on equipment, require manufacturer to have relevant support equipment, if do not have the tension reducing equipment, then can not produce the K55 sleeve pipe; Need be heated to 880 ℃ of normalizing treatment behind product 2 tubulations once more and make the K55 sleeve pipe, and carbon equivalent is unfavorable for coiled sheet butt welding end to end near 0.6, can only monovolume production, can not embody the superiority on the ERW production efficiency, also worth choosing; Product 3 is the K55 sleeve pipe of U.S.'s manufacturer production, has the too high problem of carbon equivalent equally.
Yield tensile ratio is a yield strength and the ratio of tensile strength, and therefore for the steel grade design that low yield strength ratio requires, yield strength is low as much as possible and tensile strength is high as much as possible.The common feature of product 1～3 is all Al content to be had certain requirement, and wherein Al content can be up to 0.065 in the product 1 and 2.As everyone knows, aluminium killed steel has superior performance, but Al has unusual effect to crystal grain thinning, can obviously improve YIELD STRENGTH, and yield tensile ratio is unfavorable for reducing, and should be controlled in the material design.
Consider the security of member, the low yield strength ratio of pursuing material is one of target of Materials science worker always.From the design of the composition of material, in fact common carbon manganese steel is that the ideal that realizes low yield strength ratio is selected, as is widely used in the 37Mn5 steel grade of producing the K55 weldless steel tube, and its carbon content is about 0.37%, Mn is about 1.5%.The 37Mn5 steel grade rolls back material yield intensity about 450MPa, and tensile strength can very well satisfy the requirement of K55 sleeve pipe mechanical property more than 700MPa.
ERW telescopic production technique is: steel making, continuous casting and hot rolling becomes coiled sheet-coiled sheet to shear butt welding-strip moulding-online welding-weld seam thermal treatment or homogeneous tube thermal treatment-pipe processing-factory inspection etc. end to end.It is the critical process that realizes the multireel continuous production, embodies ERW welded tube production efficiency that coiled sheet is sheared the butt welding operation end to end.But the carbon equivalent of butt welding requirement material must be low end to end owing to coiled sheet, otherwise cause the steel plate broken belt easily, has a strong impact on production efficiency.Obviously, 37Mn5 steel grade carbon equivalent has surpassed 0.6, and in conjunction with the production technology characteristic of welded tube, this steel grade obviously is not suitable for being used to produce K55 ERW sleeve pipe.Therefore, one of difficulty of K55 ERW sleeve pipe production is, must guarantee to obtain under low carbon equivalent low yield tensile ratio in the material design.
Another difficult point of K55 ERW sleeve pipe production is the strip molding procedure.By take to reduce carbon content, means such as controlled chilling when adopting alloying and hot rolling, producing mechanical property satisfies the hot-rolled sheet coil that K55 requires, still feasible in the material design.But the work-hardening effect that the strip moulding is introduced during owing to tubulation is compared with coiled sheet, and the body yield strength can increase, and tensile strength can slightly reduce because of material damage.Practice shows, the body yield strength is than coiled sheet about 50～100MPa that raises after the moulding, tensile strength about 10～30MPa that descends, like this, ideal coiled sheet yield strength should be controlled at about 400MPa and tensile strength should be controlled at more than the 680MPa, thereby the yield tensile ratio that makes material is less than 0.6.Yet, be difficult to reach this requirement for general carbon or low alloy steel.In addition, even the satisfied K55 hot-rolled sheet coil of obtained performance by the control hot rolling, after the strip moulding, even tube body performance satisfies the K55 performance requriements, the probability that the mechanical property of ERW weld seam and heat affected zone is qualified also is very little, because the hot mechanical process of the online thermal treatment of weld seam may be with hot rolling the time is complementary.On materialogy, can after coiled sheet moulding welding,, welded tube eliminate the work-hardening effect that the strip moulding brings by being carried out homogeneous tube thermal treatment.The thermal treatment of welded tube homogeneous tube not only can be eliminated the influence of the fluctuation of the work hardening of material and the performance of coiled sheet own to mechanical property, also makes the mechanical property of commissure and tissue topography and body approaching simultaneously, and the homogeneous tube stable mechanical property is good.
The present inventor is conceived to the yield tensile ratio of material in the material design, on the basis of C, Mn steel, be main strengthening element with V, suitably be equipped with Ti, Nb, Al microalloying, foreign matter contents such as control P, S, handle with cleaning molten steel through Ca, performance material potential, behind the ERW tubulation, homogeneous tube is carried out normalizing thermal treatment with the influence of reduction strip moulding to material mechanical performance, thereby obtain yield strength between 379～552MPa, the K55 resistance welding sleeve pipe of the moderate and stable performance of the carbon equivalent of tensile strength 〉=655MPa.
First purpose of the present invention is to provide a kind of low yield strength ratio electric resistance welding petroleum to overlap effective normalized steel.
Second purpose of the present invention is to provide with described low yield strength ratio electric resistance welding petroleum overlaps the low yield strength ratio electric resistance welding petroleum sleeve pipe that effective normalized steel is made.
The 3rd purpose of the present invention is to provide described low yield strength ratio electric resistance welding petroleum telescopic method for making.
Summary of the invention
The chemical ingredients that low yield strength ratio electric resistance welding petroleum of the present invention overlaps effective normalized steel comprises in weight ratio: C:0.19～0.29%, Si:0.1～0.4%, Mn:1.0～1.3%, P: S≤0.015%:＜0.008%, Al:0.002～0.04%, Ca:0.001～0.01%, V:0.08～0.14%, surplus are Fe and inevitable impurity.
The preferred version that low yield strength ratio electric resistance welding petroleum of the present invention overlaps effective normalized steel is: can add Nb in above-mentioned chemical ingredients, its addition is 0.01～0.03%.
Another preferred version that low yield strength ratio electric resistance welding petroleum of the present invention overlaps effective normalized steel is: can add Ti in above-mentioned chemical ingredients, its addition is 0.01～0.03%.
The carbon equivalent that described low yield strength ratio electric resistance welding petroleum overlaps effective normalized steel is 0.4～0.5%.
Low yield strength ratio electric resistance welding petroleum sleeve pipe of the present invention overlaps effective normalized steel with above-mentioned low yield strength ratio electric resistance welding petroleum and makes, its chemical ingredients comprises in weight ratio: C:0.19～0.29%, Si:0.1～0.4%, Mn:1.0～1.3%, P: S≤0.015%:＜0.008%, Al:0.002～0.04%, Ca:0.001～0.01%, V:0.08～0.14%, surplus are Fe and inevitable impurity.
Preferred version of low yield strength ratio electric resistance welding petroleum telescopic of the present invention is: can add Nb in above-mentioned chemical ingredients, its addition is 0.01～0.03%.
Another preferred version of low yield strength ratio electric resistance welding petroleum telescopic of the present invention is: can add Ti in above-mentioned chemical ingredients, its addition is 0.01～0.03%.
Described low yield strength ratio electric resistance welding petroleum telescopic carbon equivalent is 0.4～0.5%.
Below, low yield strength ratio electric resistance welding petroleum of the present invention is overlapped effective normalized steel and the electric resistance welding petroleum telescopic chemical ingredients made with this steel grade is done as being described in detail.
C: can significantly improve the intensity of steel, can reduce welding property greatly during its too high levels, so content be preferably 0.19～0.29%.
Mn: to improve the strength of materials, during its too high levels, the microstructure segregation in the steel is serious, influences welding property, so the content of manganese is controlled at 1.0～1.3% in ferrite in main solid solution.
Si: to improve the yield strength of steel, its content is unsuitable too high, should be controlled at 0.1～0.4% in ferrite in solid solution.
V: the carbonitride of vanadium is evenly separated out with the small and dispersed form in ferrite, can significantly improve the tensile strength of material and not obvious increase yield strength, and its content should be 0.09～0.14%.
Al: traditional deoxidation nitrogen killer, but crystal grain thinning, owing to must reduce the material yield tensile ratio, its content is unsuitable too high, should be controlled at 0.002～0.04%;
Ca: can cleaning molten steel, improve the purity of steel, make the MnS nodularization in the steel, the potential of performance material during its too high levels, easily forms thick non-metallic inclusion, and its content is 0.001～0.01%.
Ti: strong carbonitride forming element, significantly refine austenite crystal grain can remedy the decline that reduces the intensity that causes because of carbon.If its content is too high, easily form thick TiN, reduce material property, its content is 0.01～0.03%.
Nb: thin brilliant and precipitation strength element, can remedy the decline that reduces the intensity that causes because of carbon, its content answers 0.01～0.03%;
Low yield strength ratio electric resistance welding petroleum telescopic method for making of the present invention may further comprise the steps:
(1) molten steel after will smelting is after Ca handles, and continuous casting becomes base;
(2) be rolled into coiled sheet: continuously cast bloom is rolled into strip after 1200～1250 ℃ of heating, and finishing temperature is rolled the back strip and is cooled to coil into coiled sheet below 600 ℃ through laminar flow greater than 850 ℃;
(3) shear butt welding, coiled sheet moulding, ERW tubulation;
(4) normalizing thermal treatment: steel pipe is incubated in 880～1100 ℃ of normalizings;
(5) the laggard line pipe processing of cooling.
Wherein, after converter or electrosmelting are adopted in smelting, external refining again.
In step (4), soaking time is calculated as 3～6min/mm by thickness of steel pipe; Steel pipe carries out hot straightening after the normalizing insulation, the hot straightening temperature is greater than 400 ℃.
The present invention compared with prior art has conspicuous outstanding feature: alloying constituent carbon equivalent of the present invention is moderate, handle the potential of performance material by Ca, through optimizing the composition design of material, welded tube is carried out homogeneous tube normalizing thermal treatment, the final yield strength that obtains is between 379～552MPa, the low yield strength ratio electric resistance welding petroleum sleeve pipe of tensile strength 〉=655MPa, its significant advantage are because of welded tube only needs at last through normalizing treatment, the simple and homogeneous tube stable mechanical property of operation.
Embodiment
Below for a more detailed description with embodiment to the present invention.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1-4:
After Ca handled, continuous casting became base with the molten steel after converter smelting, the external refining.Continuously cast bloom is rolled into the strip of thick 10mm after 1200～1250 ℃ of heating, finishing temperature is greater than 850 ℃, and strip is cooled to 570 ℃ through laminar flow and coils into coiled sheet after rolling.After shearing butt welding, coiled sheet moulding, ERW tubulation, steel pipe carries out hot straightening with steel pipe again in 880～1100 ℃ of normalizing insulation 40min, and the hot straightening temperature is greater than 400 ℃.Last steel pipe cools off in air, and the line pipe of going forward side by side processing gets low yield strength ratio electric resistance welding petroleum sleeve pipe of the present invention.
The chemical ingredients that the low yield strength ratio electric resistance welding petroleum overlaps effective normalized steel among the embodiment of the invention 1-4 sees Table 2.
The electric resistance welding petroleum of table 2 embodiment 1-4 overlaps the chemical ingredients (wt%) of effective normalized steel
| C | Si | Mn | P | S | V | Al | Ti | Nb | Ca | |
| Embodiment 1 | 0.25 | 0.4 | 1.1 | 0.009 | 0.002 | 0.13 | 0.003 | / | / | 0.005 |
| Embodiment 2 | 0.28 | 0.3 | 1.2 | 0.010 | 0.003 | 0.09 | 0.03 | / | / | 0.008 |
| Embodiment 3 | 0.22 | 0.15 | 1.3 | 0.010 | 0.001 | 0.11 | 0.02 | 0.015 | / | 0.005 |
| Embodiment 4 | 0.2 | 0.3 | 1.2 | 0.012 | 0.004 | 0.10 | 0.03 | / | 0.015 | 0.009 |
Comparative example 1-2:
Implementation method is with embodiment 1-4, and wherein the chemical ingredients of used steel grade sees Table 3.
The chemical ingredients (wt%) of the steel grade of table 3 comparative example 1-2
| C | Si | Mn | P | S | V | Al | Ti | Nb | Ca | |
| Comparative example | 0.27 | 0.3 | 1.2 | 0.01 | 0.005 | 0.07 | 0.001 | 0.003 | ||
| Comparative example | 0.20 | 0.3 | 1.2 | 0.00 | 0.002 | 0.2 | 0.001 | 0.006 |
Embodiment 5:
Hot-rolled sheet coil among embodiment 1-4 and the comparative example 1-2 is carried out Mechanics Performance Testing, and it the results are shown in Table
The hot-rolled sheet coil mechanical property of table 4 embodiment 1-4 and comparative example 1-2
Embodiment 6:
To embodiment 1-4 and comparative example 1-2 gained carry out Mechanics Performance Testing through the heat treated electric resistance welding petroleum sleeve pipe of normalizing, it the results are shown in Table 5.
The sleeve pipe mechanical property of table 5 embodiment 1-4 and comparative example 1-2
Associative list 2, table 3 and table 5 can draw, and the electric resistance welding petroleum telescopic intensity of embodiment 1～4 gained all satisfies yield strength Rt0.5 between 379～552MPa, the requirement of tensile strength Rm 〉=655MPa, and its yield tensile ratio is lower.The V content of comparative example 1 is low slightly, and the tensile strength of material does not reach requirement, and the V content of comparative example 2 is then too high, causes the intensity of material too to be imbued with.
From table 4 and table 5 as can be seen, because welded tube has been carried out homogeneous tube normalizing thermal treatment, eliminated the influence of the fluctuation of the performance of coiled sheet own, thereby stably produced the electric resistance welding petroleum sleeve pipe that satisfies the K55 performance requriements mechanical property.
Therefore, adopt designed chemical ingredients and the heat treating method of the present invention, can obtain yield strength between 379～552MPa, the K55 resistance welding sleeve pipe of the moderate and stable performance of the carbon equivalent of tensile strength 〉=655MPa.
Claims (9)
1. a low yield strength ratio electric resistance welding petroleum overlaps effective normalized steel, it is characterized in that, the chemical ingredients that described electric resistance welding petroleum overlaps effective normalized steel comprises in weight ratio: C:0.19～0.29%, Si:0.1～0.4%, Mn:1.0～1.3%, P: S≤0.015%:＜0.008%, Al:0.002～0.04%, Ca:0.001～0.01%, V:0.08～0.14%, surplus are Fe and inevitable impurity.
2. low yield strength ratio electric resistance welding petroleum according to claim 1 overlaps effective normalized steel, it is characterized in that, described electric resistance welding petroleum overlaps in the chemical ingredients of effective normalized steel can add Nb, and its addition is 0.01～0.03%.
3. low yield strength ratio electric resistance welding petroleum according to claim 1 overlaps effective normalized steel, it is characterized in that, described electric resistance welding petroleum overlaps in the chemical ingredients of effective normalized steel can add Ti, and its addition is 0.01～0.03%.
4. low yield strength ratio electric resistance welding petroleum according to claim 1 overlaps effective normalized steel, it is characterized in that, the carbon equivalent that described electric resistance welding petroleum overlaps effective normalized steel is 0.4～0.5%.
5. a low yield strength ratio electric resistance welding petroleum sleeve pipe is characterized in that, overlaps effective normalized steel with claim 1 or 2 or 3 described low yield strength ratio electric resistance welding petroleums and makes.
6. the described low yield strength ratio electric resistance welding petroleum of claim 5 telescopic method for making is characterized in that may further comprise the steps:
(1) molten steel after will smelting is after Ca handles, and continuous casting becomes base;
(2) be rolled into coiled sheet: continuously cast bloom is rolled into strip after 1200～1250 ℃ of heating, and finishing temperature is rolled the back strip and is cooled to coil into coiled sheet below 600 ℃ through laminar flow greater than 850 ℃;
(3) shear butt welding, coiled sheet moulding, ERW tubulation;
(4) normalizing thermal treatment: steel pipe is incubated in 880～1100 ℃ of normalizings;
(5) the laggard line pipe processing of cooling.
7. low yield strength ratio electric resistance welding petroleum telescopic method for making according to claim 6, after wherein converter or electrosmelting are adopted in smelting, external refining again.
8. low yield strength ratio electric resistance welding petroleum telescopic method for making according to claim 6, wherein soaking time is calculated as 3～6min/mm by thickness of steel pipe.
9. low yield strength ratio electric resistance welding petroleum telescopic method for making according to claim 6, wherein steel pipe carries out hot straightening after the normalizing insulation, and the hot straightening temperature is greater than 400 ℃.
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| CN111304541A (en) * | 2020-04-20 | 2020-06-19 | 安徽马钢和菱实业有限公司 | Niobium-vanadium composite microalloyed seamless steel tube for semitrailer axle and production method thereof |
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