CN102191437A - Seamless steel tube for petroleum cracking and heat treatment method thereof - Google Patents
Seamless steel tube for petroleum cracking and heat treatment method thereof Download PDFInfo
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- CN102191437A CN102191437A CN 201110112387 CN201110112387A CN102191437A CN 102191437 A CN102191437 A CN 102191437A CN 201110112387 CN201110112387 CN 201110112387 CN 201110112387 A CN201110112387 A CN 201110112387A CN 102191437 A CN102191437 A CN 102191437A
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Abstract
The invention provides a seamless steel tube for petroleum cracking. The steel tube comprises the following components in percentage by weight: 0.08 to 0.15 percent of C, 0.20 to 0.50 percent of Si, 0.30 to 0.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.20 percent of Ni, 4.00 to 6.00 percent of Cr, 0.40 to 0.55 percent of Mo, less than or equal to 0.20 percent of Cu, less than or equal to 0.015 percent of Al, less than or equal to 0.08 percent of V, less than or equal to 0.01 percent of Nb, less than or equal to 0.008 percent of N, and the balance of Fe. The invention also provides a normalizing and tempering heat treatment process for producing the seamless steel tube. The invention has the advantages that: the steel tube is subjected to heat treatment by strictly controlling chemical compositions and adopting a heat treatment system beyond a GB9948 standard, various properties of the steel tube which is subjected to heat treatment meet the requirements of the standard, and the steel tube can be used for high-temperature furnace tubes and components for petroleum cracking.
Description
Technical field
The present invention relates to a kind of weldless steel tube, particularly a kind of cracking of oil weldless steel tube and heat treating method thereof of being used for.
Background technology
Because scientific and technological develop rapidly has brought negative impacts such as environmental pollution, people recognize these serious problems gradually, and beginning drops into huge energy and financial resources aspect environmental improvement.The weldless steel tube that is used for cracking of oil high temperature furnace pipe and parts, requirement has high corrosion resistance and certain high temperature intensity, but also require simultaneously normal temperature strength and the hardness can not be too high, impelling strength wants high simultaneously, thereby satisfies the security of processing characteristics and operation.
At this performance requriements, GB9946 has proposed 1Cr5Mo is adopted the annealed thermal treatment process.But annealing heat treatment process need carry out long-time heating to steel pipe, and the production cycle is long, and production efficiency is low, and to continuous heat-treating drier, this technology is also inapplicable.How to attempt to adopt annealing process, reaching good mechanical property is thorny problem.
Summary of the invention
At the GB9948 standard 1Cr5Mo is required to carry out annealed thermal treatment gon technology and be not suitable for continuous heat-treating drier, the purpose of this invention is to provide a kind of cracking of oil weldless steel tube and heat treating method thereof, comprise chemical ingredients proportioning and normalizing+tempered thermal treatment process, to satisfy the requirement that continuous heat-treating drier can thermal treatment 1Cr5Mo, guaranteed performance satisfies the requirement of GB9948 simultaneously.
For achieving the above object, the technical solution used in the present invention provides a kind of cracking of oil weldless steel tube, wherein: the composition of this steel pipe % by weight is C 0.08～0.15%, Si0.20～0.50%, Mn0.30～0.60%, P≤0.020%, S≤0.020%, Ni≤0.20%, Cr 4.00～6.00%, Mo 0.40～0.55%, Cu≤0.20%, Al≤0.015%, V≤0.08%, Nb≤0.01%, N≤0.008%, surplus are Fe.
A kind of heat treating method to the described weldless steel tube of claim 1 also is provided, wherein: when heat-treating by the weldless steel tube heat of mentioned component, adopt continuous heat-treating drier to carry out normalized and tempered, normalizing temperature is 920～960 ℃, the normalizing soaking time is 1.0～1.2min/mm, at least can not be less than 25min, and tempering temperature is 750～790 ℃, tempering insulation time is 2.0～2.3min/mm, can not be less than 1 hour at least; The wall thickness dimension unit of weldless steel tube is mm.
This weldless steel tube adopts the GB9948 standard-required, and its performance index are:
Yield strength under this weldless steel tube normal temperature is at 380～440MPa; Tensile strength is at 520～580MPa; Hardness is less than 180HB; Impact value reaches more than the 300J.
Effect of the present invention is by to the adjustment of cracking of oil with the weldless steel tube chemical ingredients, adopts the suitable heat treated normalizing of continous way to add the tempered thermal treatment process and produces, and the production efficiency height, the mechanical property of product also satisfies the GB9948 requirement.
Embodiment
In conjunction with the embodiments cracking of oil of the present invention is illustrated with weldless steel tube and heat treating method thereof.
Cracking of oil weldless steel tube of the present invention, the composition of this steel pipe % by weight is C 0.08～0.15%, Si 0.20～0.50%, Mn 0.30～0.60%, P≤0.020%, S≤0.020%, Ni≤0.20%, Cr 4.00～6.00%, Mo 0.40～0.55%, Cu≤0.20%, Al≤0.015%, V≤0.08%, Nb≤0.01%, N≤0.008%, surplus are Fe.
The cracking of oil of producing above-mentioned steel grade adopts the outer burning hot treatment process of normalizing add-back of GB9948 standard code with the weldless steel tube heat treating method, and the thermal treatment process of changing this steel grade of GB9948 standard code is annealing, and concrete processing method is:
Normalizing temperature is 920～960 ℃, and the normalizing soaking time is pressed 1.0～1.2min/mm, but can not be less than 25min, and mm is the wall thickness dimension of steel pipe, and tempering temperature is 750～790 ℃, and tempering insulation time is pressed 2.0～2.3min/mm, but can not be less than 1 hour.
Cracking of oil of the present invention is based on following analysis with weldless steel tube and heat treating method thereof:
1. chemical ingredients proportioning
The C too high levels can make the room temperature tensile intensity of 1Cr5Mo significantly improve, and finally will cause by after normalizing+tempering, and intensity is higher than standard max, and too high C content can make welding property reduce simultaneously, reduces high-temp plastic simultaneously.Therefore C content is controlled at about 0.10%.
V, Nb then can form compound between the MX shaped metal by combining with C and N, play the effect of precipitation strength and crystal grain thinning, and direct result is to make the room temperature tensile intensity of steel be higher than standard max, therefore should strict control.
S and Sization thing weaken crystal boundary at grain boundary segregation, form hole, thereby cause embrittlement of grain boundaries and creep embrittlement, therefore want strict control, and the 1Cr5Mo that my company produces is controlled at S content below 0.010%.
The existence of P in steel can increase the fragility of steel, causes the alloying element macrosegregation simultaneously, therefore wants the content of strict control P, and P content is controlled at below 0.020%.
And too high Al content will weaken other element role, also reduces the enduring quality of steel simultaneously strongly, therefore Al content is controlled at below 0.010%.
N becomes compound between the MX shaped metal with Nb in the steel with V-arrangement, intensity is had a significant effect, and therefore N content is strict controlled in below 0.008%.
The adding of Cr can significantly improve the antioxidant property and the corrosion resistance of steel, simultaneously in steel with Cr
3(C, N) or Cr
23C
6Form exist, improved the creep rupture strength of steel.But the Cr of too high amount not only increases cost, and room temperature tensile intensity is significantly raise, and therefore the content with Cr is controlled at about 4.5%.
Si is as strong reductor, and the content in the steel can not be very little, and Si improves the hot strength of steel simultaneously, but when Si content is high, causes the greying of carbon in the steel easily, therefore the Si in the steel is controlled at about 0.30%.
Mn has the effect of deoxidation, improves the purity of steel, and improves the plasticity of steel, but during too high levels, then increases the content of steel grade inclusion, and therefore the content with Mn is controlled between 0.40～0.50%.
Mo improves the resistance toheat and the hot strength of steel, but also improves the intensity and the hardness of steel room temperature simultaneously, therefore Mo is controlled between 0.40～0.45%.
2. thermal treatment process: the thermal treatment process of the 1Cr5Mo after the hot rolling being carried out normalized and tempered, process is measured the AC3 of 1Cr5Mo about 860 ℃, because alloy content is than higher, therefore normalizing temperature is decided to be more than the AC3 temperature, promptly 920～960 ℃, soaking time then is as the criterion with steel complete austenitizing and the complete solid solution of alloying element, by 1.0～1.2min/mm but can not be less than 25min; High tempering is then adopted in tempering, with the room temperature strength that guarantees steel pipe and hardness in GB9948 standard-required scope, specifically as every index in embodiment 3 tables, but can not surpass the AC1 temperature, therefore tempering temperature is decided to be 750～790 ℃, soaking time needs proper extension to reduce room temperature strength and hardness, and soaking time is pressed 2.0～2.3min/mm, but can not be less than 1 hour.
Embodiment 1:
Be used for cracking of oil and be see the following form (wt%) with the chemical ingredients of weldless steel tube:
Embodiment 2:
According to weldless steel tube specification among the embodiment 1 and corresponding chemical ingredients, heat-treat by following thermal treatment process:
| The steel pipe specification | Normalizing temperature, ℃ | The normalizing soaking time, min | Tempering temperature, ℃ | Tempering insulation time, min |
| Φ114×8.5 | 950 | ?25 | 770 | ?90 |
| Φ141×8 | 950 | ?25 | 770 | ?90 |
| Φ168×14 | 930 | ?25 | 790 | ?90 |
| Φ219×7 | 950 | ?25 | 780 | ?90 |
| Φ356×15 | 930 | ?25 | 770 | ?90 |
| Φ325×20 | 960 | ?30 | 790 | ?100 |
| Φ457×19 | 960 | ?30 | 790 | ?100 |
Embodiment 3:
According to embodiment 1 and embodiment 2, every performance of weldless steel tube all satisfies the requirement of GB9948 standard to 1Cr5Mo after the thermal treatment, table specific as follows:
Annotate: room temperature ballistic work numerical value is the numerical value that is converted into behind the standard test specimen.
Claims (3)
1. cracking of oil weldless steel tube, it is characterized in that: the composition of this steel pipe % by weight is C 0.08～0.15%, Si 0.20～0.50%, Mn 0.30～0.60%, P≤0.020%, S≤0.020%, Ni≤0.20%, Cr 4.00～6.00%, Mo 0.40～0.55%, Cu≤0.20%, Al≤0.015%, V≤0.08%, Nb≤0.01%, N≤0.008%, surplus are Fe.
2. heat treating method to the described weldless steel tube of claim 1, it is characterized in that: when heat-treating by the weldless steel tube heat of aforesaid right requirement 1 described composition, adopt continuous heat-treating drier to carry out normalized and tempered, normalizing temperature is 920～960 ℃, the normalizing soaking time is 1.0～1.2min/mm, at least can not be less than 25min, and tempering temperature is 750～790 ℃, tempering insulation time is 2.0～2.3min/mm, can not be less than 1 hour at least; The wall thickness dimension unit of weldless steel tube is mm.
3. weldless steel tube according to claim 1 and 2 is characterized in that: this weldless steel tube adopts the GB9948 standard-required, and its performance index are:
Yield strength under this weldless steel tube normal temperature is at 380～440MPa;
Tensile strength is at 520～580MPa;
Hardness is less than 180HB;
Impact value reaches more than the 300J.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747287A (en) * | 2012-07-31 | 2012-10-24 | 宝山钢铁股份有限公司 | High-temperature resistant pipe suitable for delayed coking process and producing method of high-temperature resistant pipe |
| CN103060695A (en) * | 2013-01-14 | 2013-04-24 | 攀钢集团成都钢钒有限公司 | Production method of alloy seamless steel tubes for petroleum refining |
| CN104789884A (en) * | 2015-03-16 | 2015-07-22 | 天津欧派卡石油管材有限公司 | Production method of high impact toughness petroleum casing pipe |
| CN104862603A (en) * | 2015-05-25 | 2015-08-26 | 天津钢管集团股份有限公司 | Thermal treatment method of low-hardness high-alloy seamless steel tube for petrochemical engineering |
| CN106119727A (en) * | 2016-08-17 | 2016-11-16 | 江苏常宝钢管股份有限公司 | The anti-CO of below high-strength tenacity 80Ksi2corrosion seamless gathering-line pipe and manufacture method thereof |
| RU2719212C1 (en) * | 2019-12-04 | 2020-04-17 | Акционерное общество "Первоуральский новотрубный завод" (АО "ПНТЗ") | High-strength corrosion-resistant seamless pipe from oil-field range and method of its production |
| CN113186468A (en) * | 2021-04-30 | 2021-07-30 | 马鞍山钢铁股份有限公司 | High-durability petroleum cracking pipe steel and heat treatment method and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003041351A (en) * | 2001-08-01 | 2003-02-13 | Sumitomo Metal Ind Ltd | High chromium steel and manufacturing method therefor |
| CN101899621A (en) * | 2010-07-20 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | 3Cr seamless steel pipe and production method thereof |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003041351A (en) * | 2001-08-01 | 2003-02-13 | Sumitomo Metal Ind Ltd | High chromium steel and manufacturing method therefor |
| CN101899621A (en) * | 2010-07-20 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | 3Cr seamless steel pipe and production method thereof |
Non-Patent Citations (1)
| Title |
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| 《GB9948-2006 石油裂化用无缝钢管》 20060816 中华人民共和国国家质量监督检验检疫总局 中国国家标准化管理委员会 石油裂化用无缝钢管 3 , * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747287A (en) * | 2012-07-31 | 2012-10-24 | 宝山钢铁股份有限公司 | High-temperature resistant pipe suitable for delayed coking process and producing method of high-temperature resistant pipe |
| CN103060695A (en) * | 2013-01-14 | 2013-04-24 | 攀钢集团成都钢钒有限公司 | Production method of alloy seamless steel tubes for petroleum refining |
| CN103060695B (en) * | 2013-01-14 | 2014-12-17 | 攀钢集团成都钢钒有限公司 | Production method of alloy seamless steel tubes for petroleum refining |
| CN104789884A (en) * | 2015-03-16 | 2015-07-22 | 天津欧派卡石油管材有限公司 | Production method of high impact toughness petroleum casing pipe |
| CN104862603A (en) * | 2015-05-25 | 2015-08-26 | 天津钢管集团股份有限公司 | Thermal treatment method of low-hardness high-alloy seamless steel tube for petrochemical engineering |
| CN106119727A (en) * | 2016-08-17 | 2016-11-16 | 江苏常宝钢管股份有限公司 | The anti-CO of below high-strength tenacity 80Ksi2corrosion seamless gathering-line pipe and manufacture method thereof |
| CN106119727B (en) * | 2016-08-17 | 2018-01-19 | 江苏常宝钢管股份有限公司 | The anti-CO of below high-strength tenacity 80Ksi2Corrosion seamless gathering-line pipe and its manufacture method |
| RU2719212C1 (en) * | 2019-12-04 | 2020-04-17 | Акционерное общество "Первоуральский новотрубный завод" (АО "ПНТЗ") | High-strength corrosion-resistant seamless pipe from oil-field range and method of its production |
| CN113186468A (en) * | 2021-04-30 | 2021-07-30 | 马鞍山钢铁股份有限公司 | High-durability petroleum cracking pipe steel and heat treatment method and production method thereof |
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| CN102191437B (en) | 2013-06-05 |
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Effective date of registration: 20190628 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300310 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |