CN102191437B - 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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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 for seamless steel tube for petroleum cracking and heat treating method thereof.
Background technology
Because scientific and technological develop rapidly has brought the 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 hot strength, but also require simultaneously normal temperature strength and the hardness can not be too high, impelling strength wants high simultaneously, thereby satisfies processing characteristics and Operation safety.
For this performance requriements, GB9946 has proposed 1Cr5Mo is adopted the thermal treatment process of annealing.But annealing heat treatment process need to 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 technique is also inapplicable.How to attempt to adopt annealing process, reaching good mechanical property is thorny problem.
Summary of the invention
For the GB9948 standard, the thermal treatment process that 1Cr5Mo requires to anneal is not suitable for continuous heat-treating drier, the purpose of this invention is to provide a kind of seamless steel tube for petroleum cracking and heat treating method thereof, the thermal treatment process that comprises chemical composition proportioning and normalizing+tempering, 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 is to provide a kind of seamless steel tube for petroleum cracking, wherein: the composition of this steel pipe % by weight is C 0.08～0.15%, Si0.20～0.50%, 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.
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 at least 1 hour; 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; More than impact value reaches 300J.
Effect of the present invention is by the adjustment to the seamless steel tube for petroleum cracking chemical composition, and the thermal treatment process that adopts the suitable heat treated normalizing of continous way to add tempering is produced, and production efficiency is high, and the mechanical property of product also satisfies the GB9948 requirement.
Embodiment
In conjunction with the embodiments seamless steel tube for petroleum cracking of the present invention and heat treating method thereof are illustrated.
Seamless steel tube for petroleum cracking 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 seamless steel tube for petroleum cracking heat treating method of producing above-mentioned steel grade adopts the outer burning hot treatment process of normalizing add-back of GB9948 standard code, and the thermal treatment process of changing this steel grade of GB9948 standard code is annealing, and the concrete technology 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.
Seamless steel tube for petroleum cracking of the present invention and heat treating method thereof are based on following analysis:
1. chemical composition proportioning
The C too high levels can make the mechanical properties 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 simultaneously high-temp plastic.Therefore C content is controlled at 0.10% left and right.
V, Nb can form compound between the MX shaped metal by being combined with C and N, play the effect of precipitation strength and crystal grain thinning, and direct result is to make the mechanical properties of steel higher than standard max, therefore should strictly control.
S and S compound weaken crystal boundary at grain boundary segregation, form hole, thereby cause embrittlement of grain boundaries and creep embrittlement, therefore will strictly 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 simultaneously the alloying element macrosegregation, therefore will strictly control the content of P, and P content is controlled at below 0.020%.
And too high Al content will weaken other element role, also strongly reduces the enduring quality of steel simultaneously, therefore Al content is controlled at below 0.010%.
N becomes compound between the MX shaped metal with Nb in steel with V-arrangement, intensity is had a significant effect, and therefore N content is strict controlled in below 0.008%.
Cr adds antioxidant property and the corrosion resistance that can significantly improve 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 mechanical properties is significantly raise, and therefore the content with Cr is controlled at 4.5% left and right.
Si is as strong reductor, and the content in steel can not be very little, and Si improves the hot strength of steel simultaneously, but when Si content is high, easily causes the greying of carbon in steel, therefore the Si in steel is controlled at 0.30% left and right.
Mn has the effect of deoxidation, improves the purity of steel, and improves the plasticity of steel, but during too high levels, increases the content of steel grade inclusion, and therefore the content with Mn is controlled between 0.40～0.50%.
Mo improves resistance toheat and the hot strength of steel, but also improves 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 hot rolling being carried out normalized and tempered, process is measured the AC3 of 1Cr5Mo 860 ℃ of left and right, because alloy content is higher, therefore more than normalizing temperature being decided to be the AC3 temperature, namely 920～960 ℃, soaking time 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 adopted in tempering, with the room temperature strength that guarantees steel pipe and hardness in GB9948 standard-required scope, specifically as indices 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:
The chemical composition that is used for seamless steel tube for petroleum cracking is see the following form (wt%):
Embodiment 2:
According to weldless steel tube specification in embodiment 1 and corresponding chemical composition, 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, after thermal treatment, the properties of weldless steel tube all satisfies the GB9948 standard to the requirement of 1Cr5Mo, table specific as follows:
Annotate: room temperature ballistic work numerical value is the numerical value that is converted into after standard test specimen.
Claims (1)
1. heat treating method to seamless steel tube for petroleum cracking is characterized in that:
At first prepare seamless steel tube for petroleum cracking, the composition of described weldless steel tube % 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;
When the weldless steel tube of composition described above is heat-treated, 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, tempering temperature is 750 ~ 790 ℃, and tempering insulation time is 2.0 ~ 2.3min/mm, can not be less than at least 1 hour; The wall thickness dimension unit of weldless steel tube is mm.
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Families Citing this family (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 |
| 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 |
| 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 |
| CN113186468B (en) * | 2021-04-30 | 2022-04-01 | 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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Patent Citations (2)
| 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 |
Non-Patent Citations (1)
| Title |
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| 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.《GB9948-2006 石油裂化用无缝钢管》.2006, * |
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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. |