CN105088082B - A kind of alitizing is modified P110 grades of oil annular tube steels and its tubing manufacture method - Google Patents
A kind of alitizing is modified P110 grades of oil annular tube steels and its tubing manufacture method Download PDFInfo
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Abstract
Being modified P110 grades of oil annular tube steels and its tubing manufacture method, by weight percentage, its composition the invention provides a kind of alitizing includes：C：0.07~0.09%, Mn：2.10~2.35%, Cr：1.0~1.2%, Si：0.60~0.80%, S：≤ 0.03%, P：≤ 0.03%, Ti：≤ 0.020%, remaining is iron and inevitable impurity；By the way that by sizing after heating of pipe blank, perforation, rolling, slow cooling is made after air cooling.Tubing produced by the present invention fully meets requirements of the API SPEC 5CT to P110 oil annular tube Steel Properties, and can reduce manufacturing cost and add production manufacturability.In addition, chemical composition carbon content low, micro-alloying, impact flexibility is high, good welding performance, corrosion resistance and good makes oil bushing steel have good crack arrest ability.
Description
Technical field
The present invention relates to petroleum pipeline manufacturing technology field, and in particular to a kind of alitizing is modified P110 grades of oil annular tube steels
And its tubing manufacture method.
Background technology
With the development of petroleum industry, the performance requirement of tubing and casing surface antiseptisis technology is improved constantly, oil jacket pipe surface
Its research is in widespread attention as a kind of important anti-corrosion means for aluminising modification technology.
Current alitizing is modified the P110 level oil annular tube steels generally used more uses modifier treatment, complex process, into
This is higher, and delivery cycle is long.In addition, after alitizing modification, tubing needs modifier treatment again, tube surfaces are caused to be prevented
Rotten hydraulic performance decline.Using non-hardened and tempered steel production well pipe, production technology can be simplified, production cost delivery cycle is greatly lowered.
So how to manufacture after alitizing modification, it is not necessary to re-modulate the tubing of processing, that is, produce non-modulation steel
Production well pipe, improves the decay resistance of oil jacket tubing, significant.
The content of the invention
It is an object of the invention to provide a kind of alitizing be modified P110 grades of oil annular tube steels and its tubing manufacture method,
Have the advantages that simple production process, cost are relatively low, toughness is low, corrosion resistance and good.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of alitizing is modified P110 grades of oil annular tube steels, and by weight percentage, its composition includes：C：0.07~
0.09%, Mn：2.10~2.35%, Cr：1.0~1.2%, Si：0.60~0.80%, S：≤ 0.03%, P：≤ 0.03%,
Ti：≤ 0.020%, remaining is iron and inevitable impurity.
By weight percentage, its composition includes：C：0.07~0.08%, Mn：2.10~2.35%, Cr：1.0~
1.1%, Si：0.60~0.70%, S：≤ 0.03%, P：≤ 0.03%, Ti：≤ 0.020%, remaining is iron and inevitable miscellaneous
Matter.
By weight percentage, its composition includes：C：0.08~0.09%, Mn：2.10~2.35%, Cr：1.1~
1.2%, Si：0.70~0.80%, S：≤ 0.03%, P：≤ 0.03%, Ti：≤ 0.020%, remaining is iron and inevitable miscellaneous
Matter.
A kind of alitizing is modified P110 grades of oil annular tube steel tubing manufacture methods, comprises the following steps：
1) by weight percentage, by C：0.07~0.09%, Mn：2.10~2.35%, Cr：1.0~1.2%, Si：
0.60~0.80%, S：≤ 0.03%, P：≤ 0.03%, Ti：≤ 0.020%, remaining is iron, smelted, external refining, casting
Make, pipe is made；
2) pipe is heated in heating furnace, heating-up temperature is 1245~1275 DEG C；
3) the pipe perforated machine after heating is perforated, temperature is 1200~1220 DEG C after pipe perforation；
4) rolled again by Continuous mill train, the start temperature of Continuous mill train rolling is 1150~1180 DEG C；
5) and then sizing unit sizing, the start temperature of sizing unit are passed through：850~900 DEG C；
6) slow cooling after last air cooling.
The step 7) slow cooling start temperature be 350~400 DEG C；Slow cooling soaking time is 48h.
Carry out step 6) before, aligned by straightener.
The step 1) in smelt carried out in converter or electric furnace.
The step 2) in heating furnace be rotary heating furnace.
Compared with prior art, the device have the advantages that：
It is with low C, appropriate Mn, by adding that a kind of alitizing that the present invention is provided, which is modified P110 grades of oil annular tube composition of steel,
Enter the microalloy elements such as Cr, trace Ti, with reference to retarded cooling process, obtain the tissue based on ultrafine particulate bainite+lath martensite,
To ensure that oil bushing steel has excellent mechanical property.The effect of its main constituents is as follows：
Carbon：In the case of abundant austenitizing, with the increase of austenite carbon content, C curve is gradually moved to right, overcooling austenite
Stability increase.In general, raised with carbon content, the intensity rise of steel, but welding performance and plasticity and toughness decline.For this
The alitizing of invention is modified P110 grades of oil annular tube steels and designed using 0.07~0.09% carbon weight percentage composition.
Manganese：It is to compensate in oil annular tube steel to cause the main and most economical reinforcing of loss of strength because C content is reduced
Element.Mn is the element for expanding γ phase regions, it is possible to decrease γ → α phase transition temperatures of steel, helps to obtain tiny phase-change product, can
Improve toughness, the reduction ductile-brittle transition temperature of steel.Alitizing to the present invention is modified the Mn weight of P110 grades of oil annular tube steels
Percentage composition is designed in 2.10~2.35% scopes.
Titanium：It is strong N compound formation elements, in austenitizing temperature soaking, tiny TiN precipitated phases can effectively press down
Austenite Grain Growth processed, refines original austenite grain, and TiN precipitated phases have to the impact flexibility for improving welding heat affected zone in addition
Obvious effect.Trace Ti is that above-mentioned effect can be achieved, therefore Ti weight percentage≤0.020% that the present invention chooses.
Chromium：Cr is middle carbide, it is however generally that, Cr can significantly improve the stability of metastable austenite and quench
Permeability, increases the supercooling ability of austenite, postpones ferrite and pearlite transformation, and postpones bainite transformation, is conducive to iron element
The appearance in the metastable austenite area between body limited proportionality and bainite transformation area.It is weight percent 1.0 that the present invention, which chooses Cr contents,
~1.2%.
A kind of alitizing that the present invention is provided is modified P110 grades of oil annular tube steels, using granular bainite+lath geneva
Body tissue, fully meets requirements of the API SPEC 5CT to P110 oil annular tube Steel Properties, and can reduce manufacturing cost and
Add production manufacturability.Chemical composition carbon content low, micro-alloying, impact flexibility is high, good welding performance, decay resistance
It is good, make oil bushing steel that there is good crack arrest ability.
A kind of alitizing that the present invention is provided is modified the manufacture method of P110 grades of oil annular tube steel tubings, by cold eventually
Slow cooling is carried out to tubing afterwards, following effect can be played：
1st, residual stress is eliminated.
2nd, M-A islands are made to produce self tempering, so as to improve the yield strength and impact flexibility of steel.
3rd, tempering heat treatment process instead of by retarded cooling process, saves the energy and cost.
The manufacture method of the present invention improves the decay resistance of oil jacket tubing without quenching-and-tempering process.Hot-roller
Skill employs retarded cooling process, and tissue and the quality control of final products are carried out by rational composition and technique.Even more important
It is that in the present invention after alitizing modification, tubing need not carry out modifier treatment, improve the corrosion resistance of oil jacket tubing
Can, overcome needs modifier treatment again after alitizing modification in the prior art, causes under tube surfaces antiseptic property
The problem of drop.
The present invention have on alloy formula relatively low C content (0.07~0.09%), certain Cr contents (1.0~
1.2%) certain Si contents (0.6~0.8%) and micro Ti (≤0.020), be added without the elements such as Mo, Ni, Cu, V, Nb,
Composition design is simple, cost is relatively low；Appropriate Mn (2.10~2.35%) content, take full advantage of Mn elements phase transformation strengthening and
Solution strengthening effect；Retarded cooling process after above components matching hot rolling, not only increases the combination property of product, and can take
Flexible hot-rolled production process, improves productivity ratio.In addition, possessing product that relatively low C content produced with higher intensity
While, maintain good low-temperature flexibility and welding performance, and have certain decay resistance, there is oil bushing steel good
Crack arrest ability.
The alitizing produced of manufacture method of the present invention be modified P110 grades of oil annular tube steel tubings performance reach with
It is lower to require：
(1), tensile property, target：Rt0.5=758~965MPa, Rm≤724MPa；
(2), v-notch Charpy impact performance, target：- 20 DEG C of test temperature, the impact of 10mm × 10mm × 55mm samples
Work(single value >=70J, average value >=100J；
(3), metallographic structure, is organized based on granular bainite+lath martensite tissue.
Brief description of the drawings
Fig. 1 for the embodiment of the present invention 1 hot rolling slow cooling after steel pipe metallographic structure figure.
Fig. 2 for the embodiment of the present invention 2 hot rolling slow cooling after steel pipe metallographic structure figure.
Fig. 3 for the embodiment of the present invention 3 hot rolling slow cooling after steel pipe metallographic structure figure.
Embodiment
The present invention is described in detail in conjunction with the embodiments below in conjunction with the accompanying drawings.
Embodiment 1
A kind of alitizing is modified P110 grades of oil annular tube steels, and its chemical composition (percentage by weight) is：0.079% C,
2.3% Mn, 0.7% Si, 0.0078% P, 0.0017% S, 1.1% Cr, 0.019% Ti, remaining composition is
Fe。
Above-mentioned alitizing is modified the manufacture method of P110 grades of oil annular tube steel tubings, by weight percentage, by it is above-mentioned into
Divide progress converter or electric furnace smelting, the outer refining of refining, cast obtained pipe, pipe is heated to 1250 DEG C through rotary heating furnace；It will add
Pipe perforated machine perforation after heat, temperature is 1220 DEG C after pipe perforation；Then rolled by Continuous mill train, control connects
The start temperature of milling train group rolling is 1180 DEG C；Again by sizing unit sizing, the start temperature for controlling sizing unit is 870
℃；Aligned through straightener, be finally air-cooled to stacking insulation slow cooling 48h after 380 DEG C.
The mechanical property of the steel tubing manufactured through the above method is yield strength 778MPa, tensile strength 835MPa, extension
Rate 18.0%, -20 DEG C of ballistic work (Akv)121J.Its performance indications fully meets API standard and P110 grades of oil annular tube steels is wanted
Ask.The example metallographic structure is granular bainite+lath martensite, reference picture 1.
Embodiment 2
A kind of alitizing is modified P110 grades of oil annular tube steels, and its chemical composition (percentage by weight) is：0.083% C,
2.31% Mn, 0.61% Si, 0.0088% P, 0.0024% S, 1.1% Cr, 0.020% Ti, remaining composition
For Fe.
Above-mentioned alitizing is modified the manufacture method of P110 grades of oil annular tube steel tubings, by weight percentage, by it is above-mentioned into
This progress converter or electric furnace smelting, the outer refining of refining, the obtained pipe of casting, pipe are heated to 1250 DEG C through rotary heating furnace；It will add
Pipe perforated machine perforation after heat, temperature is 1200 DEG C after pipe perforation；Then rolled by Continuous mill train, control connects
The start temperature of milling train group rolling is 1150 DEG C；Again by sizing unit sizing, it is 850 to control the start temperature after sizing unit
℃；Aligned through straightener, be finally air-cooled to stacking insulation slow cooling 48h after 350 DEG C.
The mechanical property of the steel tubing manufactured through the above method is yield strength 785MPa, tensile strength 840MPa, extension
Rate 22.0%, -20 DEG C of ballistic work (Akv)107J.Its performance indications fully meets API standard and P110 grades of oil annular tube steels is wanted
Ask.The example metallographic structure is acinous bainite+lath martensite, reference picture 2.
Embodiment 3
A kind of alitizing is modified P110 grades of oil annular tube steels, and its chemical composition (percentage by weight) is：0.089% C,
2.31% Mn, 0.71% Si, 0.0078% P, 0.0028% S, 1.2% Cr, 0.020% Ti, remaining composition
For Fe.
Above-mentioned alitizing is modified the manufacture method of P110 grades of oil annular tube steel tubings, by weight percentage, by it is above-mentioned into
Divide progress converter or electric furnace smelting, the outer refining of refining, cast obtained pipe, pipe is heated to 1250 DEG C through rotary heating furnace；It will add
Pipe perforated machine perforation after heat, temperature is 1220 DEG C after pipe perforation；Then rolled by Continuous mill train, control connects
The start temperature of milling train group rolling is 1150 DEG C；Again by sizing unit sizing, it is 860 to control the start temperature after sizing unit
℃；Aligned through straightener, be finally air-cooled to stacking insulation slow cooling 48h after 400 DEG C.
The mechanical property of the steel tubing made through the above method is yield strength 785MPa, tensile strength 881MPa, extension
Rate 21.0%, -20 DEG C of ballistic work (Akv)117J.Its performance indications fully meets API standard and P110 grades of oil annular tube steels is wanted
Ask.The example metallographic structure is acinous bainite+lath martensite, reference picture 3.
Embodiment 4
A kind of alitizing is modified P110 grades of oil annular tube steels, and its chemical composition (percentage by weight) is：0.07% C,
2.1% Mn, 0.8% Si, 0.03% P, 0.0017% S, 1.0% Cr, 0.019% Ti, remaining composition are Fe.
Above-mentioned alitizing is modified the manufacture method of P110 grades of oil annular tube steel tubings, by weight percentage, by it is above-mentioned into
Divide the outer refining of progress converter smelting, refining, cast obtained pipe, pipe is heated to 1245 DEG C through rotary heating furnace；After heating
Pipe perforated machine is perforated, and temperature is 1210 DEG C after pipe perforation；Then rolled by Continuous mill train, control Continuous mill train
The start temperature of rolling is 1160 DEG C；Again by sizing unit sizing, the start temperature for controlling sizing unit is 900 DEG C；Through rectifying
Straight machine aligning, is finally air-cooled to stacking insulation slow cooling 48h after 350 DEG C.
Embodiment 5
A kind of alitizing is modified P110 grades of oil annular tube steels, and its chemical composition (percentage by weight) is：0.09% C,
2.35% Mn, 0.6% Si, 0.0088% P, 0.03% S, 1.2% Cr, 0.02% Ti, remaining composition are Fe.
Above-mentioned alitizing is modified the manufacture method of P110 grades of oil annular tube steel tubings, by weight percentage, by it is above-mentioned into
Divide the outer refining of progress converter smelting, refining, cast obtained pipe, pipe is heated to 1275 DEG C through rotary heating furnace；After heating
Pipe perforated machine is perforated, and temperature is 1200 DEG C after pipe perforation；Then rolled by Continuous mill train, control Continuous mill train
The start temperature of rolling is 1170 DEG C；Again by sizing unit sizing, the start temperature for controlling sizing unit is 890 DEG C；Through rectifying
Straight machine aligning, is finally air-cooled to stacking insulation slow cooling 48h after 370 DEG C.
It is with low C, in right amount that a kind of alitizing that the present invention is provided, which is modified P110 grades of oil annular tube steel composition design thoughts,
Mn, by adding the microalloy elements such as Cr, trace Ti, with reference to retarded cooling process, obtaining ultrafine particulate bainite+lath martensite is
Main tissue, to ensure that oil bushing steel has excellent mechanical property.
Compared with conventional oil bushing steel composition, the present invention have on alloy formula relatively low C content (0.07~
0.09%), the certain Si contents (0.6~0.8%) of certain Cr contents (1.0~1.2%) and micro Ti (≤0.020),
The elements such as Mo, Ni, Cu, V, Nb are added without, composition design is simple, cost is relatively low；Appropriate Mn (2.10~2.35%) content, fills
Divide the phase transformation strengthening and solution strengthening effect that make use of Mn elements；Retarded cooling process after above components matching hot rolling, is not only increased
The combination property of product, and flexible hot-rolled production process can be taken, improve productivity ratio.In addition, possessing relatively low C content institute
The product of production while with higher intensity, maintain good low-temperature flexibility and welding performance, and have certain resistance to
Corrosive nature, makes oil bushing steel have good crack arrest ability.
Particularly, a kind of alitizing that the present invention is provided is modified P110 grades of oil annular tube steel what is more important, surface
After aluminising modification, tubing need not carry out modifier treatment, improve the decay resistance of oil jacket tubing.
The steel that the present invention is produced has granular bainite+lath martensite tissue, fully meets API SPEC 5CT couple
The requirement of P110 oil annular tube Steel Properties, and manufacturing cost can be reduced and production manufacturability is added.
The performance for the oil annular tube steel produced according to above-mentioned manufacture method reaches claimed below：
(1), tensile property, target：Rt0.5=758~965MPa, Rm≤724MPa；
(2), v-notch Charpy impact performance, target：- 20 DEG C of test temperature, the impact of 10mm × 10mm × 55mm samples
Work(single value >=70J, average value >=100J；
(3), metallographic structure, is organized based on granular bainite+lath martensite tissue.
Referring to table 1, table 1 shows difference of the steel addressed in steel of the present invention and existing patent document in chemical composition.
The steel of the present invention of table 1 and the comparison of prior art chemical composition
Compared with patent document 1, C content is improved in composition of the invention, Cr elements are added, it is therefore an objective to improve metastable Austria
The stability and quenching degree of family name's body, increase austenite supercooling ability, postpone ferrite and pearlite transformation, promote C curve by
Gradually move to right, postpone bainite transformation, it is to avoid high temperature microstructure transformation occurs during alumetizing process, it is further cold in aluminising
But the tissue based on more ultrafine particulate bainite+lath martensites is obtained during, so as to ensure that alloy after aluminising
With excellent mechanical property and corrosion resisting property.
Compared with patent document 2,3 and 4, C content is significantly reduced in composition of the invention, is used with C, Mn, Cr, Si element
Based on, the alloying elements such as a small amount of Ti are added, the alloying elements such as NiCu, V is added without, simplifies steel making working procedure, reduce cost.
It should be noted last that, above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (1)
1. a kind of alitizing is modified P110 grades of oil annular tube steel tubing manufacture methods, it is characterised in that comprise the following steps：
1) by weight percentage, by 0.079% C, 2.3% Mn, 0.7% Si, 0.0078% P, 0.0017%
S, 1.1% Cr, 0.019% Ti, remaining composition are Fe, smelted, external refining, casting, obtained pipe；
2) pipe is heated in heating furnace, heating-up temperature is 1250 DEG C；
3) the pipe perforated machine after heating is perforated, temperature is 1220 DEG C after pipe perforation；
4) rolled again by Continuous mill train, the start temperature of Continuous mill train rolling is 1180 DEG C；
5) and then sizing unit sizing, the start temperature of sizing unit are passed through：870℃；
6) finally it is air-cooled to slow cooling 48h after 380 DEG C；
The mechanical property of the steel tubing of above method manufacture is that yield strength is that 778MPa, tensile strength are 835MPa, elongation percentage
For 18.0%, -20 DEG C of ballistic works be 121J.
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| CN106064183A (en) * | 2016-07-18 | 2016-11-02 | 内蒙古北方重工业集团有限公司 | A kind of slow cooling method containing Cr, Mo alloy large-size extruding heavy wall steps of manufacturing blanks |
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| JP3981615B2 (en) * | 2002-09-30 | 2007-09-26 | 新日本製鐵株式会社 | Non-water-cooled thin low yield ratio high-tensile steel and method for producing the same |
| CN100398684C (en) * | 2005-12-22 | 2008-07-02 | 宝山钢铁股份有限公司 | Superhigh strength X100 pipeline steel and its hot rolled plate making process |
| CN101967607A (en) * | 2010-10-22 | 2011-02-09 | 清华大学 | Manganese-series ultra-low carbon bainitic steel and preparation method of steel plate thereof |
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