CN103820707B - Containing the preparation method of rare-earth ferrite alloy seamless steel pipe - Google Patents
Containing the preparation method of rare-earth ferrite alloy seamless steel pipe Download PDFInfo
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- CN103820707B CN103820707B CN201410059754.4A CN201410059754A CN103820707B CN 103820707 B CN103820707 B CN 103820707B CN 201410059754 A CN201410059754 A CN 201410059754A CN 103820707 B CN103820707 B CN 103820707B
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Abstract
The invention discloses a kind of preparation method containing rare-earth ferrite alloy seamless steel pipe, comprising: the rolling of STEELMAKING PRODUCTION, steel and roll state steel heat treatment.Of the present invention have better ductility and toughness containing rare-earth ferrite alloy seamless steel pipe.
Description
Technical field
The present invention relates to metal material field, specifically, relate to a kind of preparation method containing rare-earth ferrite alloy seamless steel pipe.
Background technology
High temperature iron ferritic alloy steel pipe is widely used in actual life, and its environment for use is generally the hot environment such as line pipe, boiler pipe, and therefore, resistance to elevated temperatures and toughness weigh the important technology index of this high temperature iron ferritic alloy steel pipe material.But the existing cost containing rare-earth ferrite alloy seamless steel pipe is higher, and the mechanical property of the Alfer weldless steel tube usually produced is poor, and unit elongation is about 35%, and ballistic work is at about 180J.
Existingly prepare Alfer weldless steel tube, in heat treatment process, normative heat treatment technique is the technique of first normalizing tempering again, makes complicated process of preparation.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method containing rare-earth ferrite alloy seamless steel pipe, and preparation technology is simple.
Another technical scheme of the present invention is as follows:
Containing the preparation method of rare-earth ferrite alloy seamless steel pipe, comprising: the rolling of STEELMAKING PRODUCTION, steel and roll state steel heat treatment, the rolling of described steel mainly comprises: the heating of circle base, perforation, tube rolling and tension reducing; The temperature of described round base heating is 1260 ~ 1280 DEG C, and the temperature of described perforation is 1240 ~ 1260 DEG C, and the temperature of described tube rolling is 1180 ~ 1220 DEG C, and the temperature of described tension reducing is 860 ~ 880 DEG C; The described state steel heat treatment that rolls adopted tempering, and the temperature of described tempering is 670 ± 10 DEG C, 670 ± 10 DEG C of insulations 90 ~ 100 minutes; The mass percentage of the material chemical composition containing rare-earth ferrite alloy seamless steel pipe prepared comprises: C0.14% ~ 0.15%, Si0.21% ~ 0.24%, Mn0.49% ~ 0.51%, Mo0.519% ~ 0.533%, P≤0.018%, S≤0.008%, Re0.002% ~ 0.003%, all the other are Fe, and each composition quality mark amounts to 100%.
Further, described STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting.
Further, described converter smelting adopts desulphurised hot metal to smelt, every stove molten iron is 100 tons, every stove molten iron adds ferrosilicon 200kg, ferromanganese 800kg, molybdenum-iron 1000kg, the mass percentage of the composition of the molten iron of the terminal of described converter smelting comprises: C>=0.06%, P≤0.015%, and described converter smelting adopts single slag technique to smelt, before tapping, every stove molten iron adds the slag making of 200kg lime, finishing slag basicity>=3.0; Described LF refining carries out slag making desulfurization, composition adjustment and warming temperature according to the molten steel composition of converter smelting and temperature, and slag former adopts CaO-CaF
2, molten steel per ton adds 8-10kg slag former, and comprise by following mass percentage adjustment molten steel composition: C0.14%, Si0.23%, Mn0.5%, Mo0.52%, P≤0.018%, S≤0.008%, the target temperature of warming temperature is 1529 DEG C; Vacuum tightness≤the 0.1KPa of described VD vacuum outgas, dark vacuum time>=10min, soft blow Ar>=10 minute; The pulling rate of described round billet continuous casting is 1.6m/min, condensate depression Δ T≤30 DEG C.
Further, the mass percentage of the described material chemical composition containing rare-earth ferrite alloy seamless steel pipe prepared comprises: C0.14%, Si0.21%, Mn0.51%, Mo0.533%, P0.014%, S0.008% and Re0.002%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.523%, P0.017%, S0.005% and Re0.003%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.519%, P0.011%, S0.006% and Re0.003%; Or, C0.14%, Si0.24%, Mn0.49%, Mo0.525%, P0.010%, S0.005% and Re0.002%; Or, C0.15%, Si0.22%, Mn0.50%, Mo0.521%, P0.018%, S0.006% and Re0.002%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.522%, P0.012%, S0.007% and Re0.003%.
Technique effect of the present invention is as follows:
1, of the present invention have better ductility and toughness containing rare-earth ferrite alloy seamless steel pipe.
2, of the present invention containing rare-earth ferrite alloy seamless steel pipe, unit elongation can up to 40%, and ballistic work is up to more than 200J.
3, the preparation method containing rare-earth ferrite alloy seamless steel pipe of the present invention is by the control to finishing temperature, on the basis that guaranteed performance is stable, simplifies thermal treatment process, reaches the object of cost efficiency.
Embodiment
The present invention is directed to existing Alfer weldless steel tube, Baogang is utilized to have by oneself in ore natural in rare soil characteristics, not increasing on the basis of manufacturing cost, utilize resources advantage, a kind of Alfer weldless steel tube with better ductility and toughness and preparation method thereof is provided.Wherein, the main rare-earth elements in this ore is La and Ce.The detailed process of the preparation method containing rare-earth ferrite alloy seamless steel pipe of the present invention is as follows:
Step S1: STEELMAKING PRODUCTION
STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting.
By hot metal pretreatment, pre-desulfurization is carried out to molten iron, sulphur content is controlled below 0.05%.
Converter smelting adopts desulphurised hot metal, and for suppressing non-metallic inclusion in material, add ferrosilicon, ferromanganese and molybdenum-iron, add-on calculates according to Composition Design content requirement in its recovery rate, ferrous alloy interalloy content, steel.Every stove molten iron is 100 tons, and the every stove of ferrosilicon adds 200kg, the every stove of ferromanganese adds 800kg, the every stove of molybdenum-iron adds 1000kg, and alloy before addition must deoxidation alloying.Due to gas content such as oxygen nitrogen in material can be made while carburetting to increase, therefore the control objectives of the mass percentage of the composition of the molten iron of converter terminal comprises: C >=0.06%, P≤0.015%.Adopt single slag technique to smelt, before tapping, every stove molten iron adds the slag making of 200kg lime, finishing slag basicity >=3.0.For ensureing the cleanliness factor of material, necessary pushing off the slag during tapping, pushing off the slag unsuccessfully must be skimmed.
In LF refining link, carry out slag making desulfurization, composition adjustment and warming temperature according to converter molten steel composition and temperature, slag former adopts CaO-CaF
2, molten steel per ton adds 8-10kg slag former, comprises: C0.14%, Si0.23%, Mn0.5%, Mo0.52%, P≤0.018%, S≤0.008%, the target temperature of warming temperature is 1529 DEG C by the target value of following mass percentage adjustment molten steel composition.
The dark vacuum tightness target value≤0.1KPa of VD vacuum outgas, dark vacuum time >=10 minute, soft blow Ar >=10 minute, to ensure gas content lower in material.
Condensate depression Δ T≤30 DEG C of round billet continuous casting process, pulling rate is 1.6m/min.
Step S2: the rolling of steel
The rolling of steel mainly comprises: the heating of circle base, perforation, tube rolling and tension reducing, and detailed process is: circle base → sawing → circle base heating → perforation → tube rolling → tension reducing → sampling → cooling → crop end → align → check → pack → weigh → warehouse-in.Application Ф 180MPM unit rolling specs is the weldless steel tube of Φ 219mm × 10mm, laboratory adopts thermal modeling test to formulate rolling technology, rolling technology is: circle base heating and temperature control is at 1260 ~ 1280 DEG C, the temperature of circle base perforation is 1240 ~ 1260 DEG C, the temperature of tube rolling is 1180 ~ 1220 DEG C, and the temperature of tension reducing is 860 ~ 880 DEG C.
Step S3: roll state steel heat treatment
Tension reducing temperature controls at 860 ~ 880 DEG C, and finishing temperature is not less than 850 DEG C, replaces normalizing temperature with finishing temperature, thus uniform formation and composition, therefore roll state steel heat treatment and only adopt tempering process.The tempering system of laboratory screening was 670 ± 10 DEG C of tempering, 670 ± 10 DEG C of insulations 90 ~ 100 minutes.
The mass percentage containing rare-earth ferrite alloy seamless steel pipe material chemical composition prepared through said process is: C0.14% ~ 0.15%, Si0.21% ~ 0.24%, Mn0.49% ~ 0.51%, Mo0.519% ~ 0.533%, P≤0.018%, S≤0.008%, Re0.002% ~ 0.003%, all the other are Fe, and each composition quality mark amounts to 100%.
Detect the chemical composition of each embodiment, the mass percentage containing rare-earth ferrite alloy seamless steel pipe material chemical composition of each embodiment is as shown in table 1.
C content is gained in strength rising, but plasticity and impact reduce.Si plays reductive agent and reductor effect in smelting process, and content should control between 0.21% ~ 0.24%.Mn is good reductor and sweetening agent, generally containing Mn0.49% ~ 0.51%.The maximum harm of P is that segregation is serious, increases temper brittleness, significantly reduces plasticity and the toughness of steel; S, usually making steel generation red brittleness, reduces ductility and the toughness of steel, causes crackle, therefore should strictly control P, S when forging and rolling; Alloy Elements Mo can improve the hot strength of steel, and Re can improve the toughness of steel.Re (mainly La and Ce element) in the present invention is not additional alloy, but Baogang has the natural rare earth contained in ore by oneself is deposited in the content in final finished steel, therefore, while not increasing raw material manufacturing cost, provide a kind of performance better Alfer steel pipe.
Detect the metallographic structure containing rare-earth ferrite alloy seamless steel pipe of each embodiment, and test mechanical property, result is respectively as shown in table 2 and table 3.
The each embodiment composition of table 1 (mass percent/%)
| Embodiment | C | Si | Mn | P | S | Mo | Re |
| Embodiment 1 | 0.14 | 0.21 | 0.51 | 0.014 | 0.008 | 0.533 | 0.002 |
| Embodiment 2 | 0.14 | 0.23 | 0.51 | 0.017 | 0.005 | 0.523 | 0.003 |
| Embodiment 3 | 0.14 | 0.23 | 0.51 | 0.011 | 0.006 | 0.519 | 0.003 |
| Embodiment 4 | 0.14 | 0.24 | 0.49 | 0.010 | 0.005 | 0.525 | 0.002 |
| Embodiment 5 | 0.15 | 0.22 | 0.50 | 0.018 | 0.006 | 0.521 | 0.002 |
| Embodiment 6 | 0.14 | 0.23 | 0.51 | 0.012 | 0.007 | 0.522 | 0.003 |
The metallographic structure detected result of each embodiment of table 2
Note: in table 2, F is ferrite, P perlite.
The mechanical experimental results of each embodiment of table 3
As can be found from Table 2, each embodiment inclusion is tiny, be evenly distributed, and weave construction is suitable for, and crystal grain is tiny, can reach 8.5 grades.As can be seen from Table 3, the material of each embodiment has good mechanical property.
Prepare 1 ton of rare-earth ferrite alloy seamless steel pipe that contains of the present invention and can create economic benefit more than 300 yuan, optimize existing product structure, improve product specification, create certain social benefit and economic benefit.
Claims (4)
1. containing the preparation method of rare-earth ferrite alloy seamless steel pipe, it is characterized in that, comprising: the rolling of STEELMAKING PRODUCTION, steel and roll state steel heat treatment, the rolling of described steel mainly comprises: the heating of circle base, perforation, tube rolling and tension reducing; The temperature of described round base heating is 1260 ~ 1280 DEG C, and the temperature of described perforation is 1240 ~ 1260 DEG C, and the temperature of described tube rolling is 1180 ~ 1220 DEG C, and the temperature of described tension reducing is 860 ~ 880 DEG C; The described state steel heat treatment that rolls adopted tempering, and the temperature of described tempering is 670 ± 10 DEG C, 670 ± 10 DEG C of insulations 90 ~ 100 minutes; The mass percentage of the material chemical composition containing rare-earth ferrite alloy seamless steel pipe prepared comprises: C0.14% ~ 0.15%, Si0.21% ~ 0.24%, Mn0.49% ~ 0.51%, Mo0.519% ~ 0.533%, P≤0.018%, S≤0.008%, Re0.002% ~ 0.003%, all the other are Fe, and each composition quality mark amounts to 100%.
2. the preparation method containing rare-earth ferrite alloy seamless steel pipe as claimed in claim 1, it is characterized in that, described STEELMAKING PRODUCTION comprises: hot metal pretreatment, converter smelting, LF refining, VD vacuum outgas and round billet continuous casting.
3. the preparation method containing rare-earth ferrite alloy seamless steel pipe as claimed in claim 2, is characterized in that,
Described converter smelting adopts desulphurised hot metal to smelt, every stove molten iron is 100 tons, every stove molten iron adds ferrosilicon 200kg, ferromanganese 800kg, molybdenum-iron 1000kg, the mass percentage of the composition of the molten steel of the terminal of described converter smelting comprises: C >=0.06%, P≤0.015%, described converter smelting adopts single slag technique to smelt, and before tapping, every stove molten steel adds the slag making of 200kg lime, finishing slag basicity >=3.0;
Described LF refining carries out slag making desulfurization, composition adjustment and warming temperature according to the molten steel composition of converter smelting and temperature, and slag former adopts CaO-CaF
2, molten steel per ton adds 8-10kg slag former, and comprise by following mass percentage adjustment molten steel composition: C0.14%, Si0.23%, Mn0.5%, Mo0.52%, P≤0.018%, S≤0.008%, the target temperature of warming temperature is 1529 DEG C;
Vacuum tightness≤the 0.1KPa of described VD vacuum outgas, dark vacuum time >=10min, soft blow Ar >=10 minute;
The pulling rate of described round billet continuous casting is 1.6m/min, condensate depression Δ T≤30 DEG C.
4. the preparation method containing rare-earth ferrite alloy seamless steel pipe as described in any one of claims 1 or 2, it is characterized in that, the mass percentage of the described material chemical composition containing rare-earth ferrite alloy seamless steel pipe prepared comprises: C0.14%, Si0.21%, Mn0.51%, Mo0.533%, P0.014%, S0.008% and Re0.002%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.523%, P0.017%, S0.005% and Re0.003%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.519%, P0.011%, S0.006% and Re0.003%; Or, C0.14%, Si0.24%, Mn0.49%, Mo0.525%, P0.010%, S0.005% and Re0.002%; Or, C0.15%, Si0.22%, Mn0.50%, Mo0.521%, P0.018%, S0.006% and Re0.002%; Or, C0.14%, Si0.23%, Mn0.51%, Mo0.522%, P0.012%, S0.007% and Re0.003%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102400047A (en) * | 2011-11-15 | 2012-04-04 | 内蒙古包钢钢联股份有限公司 | Method for preparing rare earth-containing seamless steel tube for petroleum cracking |
| CN103131950A (en) * | 2013-03-22 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Rear-earth-containing seamless steel tube material for high-pressure fertilizer and preparation method thereof |
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| JP4259347B2 (en) * | 2004-02-19 | 2009-04-30 | 住友金属工業株式会社 | Manufacturing method of high strength non-tempered seamless steel pipe |
| AR075976A1 (en) * | 2009-03-30 | 2011-05-11 | Sumitomo Metal Ind | METHOD FOR THE MANUFACTURE OF PIPE WITHOUT SEWING |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102400047A (en) * | 2011-11-15 | 2012-04-04 | 内蒙古包钢钢联股份有限公司 | Method for preparing rare earth-containing seamless steel tube for petroleum cracking |
| CN103131950A (en) * | 2013-03-22 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Rear-earth-containing seamless steel tube material for high-pressure fertilizer and preparation method thereof |
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