CN105506472A - Hot-rolled steel plate for 560 MPa-grade deep sea pipeline and production method thereof - Google Patents
Hot-rolled steel plate for 560 MPa-grade deep sea pipeline and production method thereof Download PDFInfo
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Abstract
The invention provides a hot-rolled steel plate for a 560 MPa-grade deep sea pipeline. The steel plate comprises the following components in percentage by weight: 0.04-0.09% of C, 0.18-0.45% of Si, 1.2-1.75% of Mn, P not more than 0.020%, S not more than 0.003%, Nb not more than 0.08%, Ti not more than 0.025%, V not more than 0.03%, Mo not more than 0.20%, Cu not more than 0.25%, 0.10-0.30% of Ni, Cr not more than 0.25%, N not more than 0.008%, 0.010-0.040% of Al, Al/N not less than 2, and the balance of iron and inevitable impurities. A method comprises the following steps: the heating temperature of a continuous casting blank is 1160-1230 DEG C; the heating time is 1.0-1.5 min/mm; the insulation time of a soaking zone is not shorter than 60 min; the reduction of rough milling pass is not less than15%; the transverse rolling deformation is not less than 30%; the deformation of final pass is not less than 20%; the temperature is 1000-1100 DEG C; the finish rolling temperature is 750-830 DEG C; the accumulated deformation is 60-75%; the after-rolling cooling speed is 15-35 DEG C/s; the final cooling temperature is 400-500 DEG C; and finally, the air cooling is performed. The steel plate is excellent in transverse and longitudinal performances, excellent in corrosion resistance and suitable for serving as a raw material of manufacturing a deep sea oil and gas transportation pipeline.
Description
Technical field
The invention belongs to field of low-carbon micro-alloy steel, particularly relate to a kind of 560MPa level think gauge deep-sea pipeline hot-rolled steel sheet and production method thereof.
Background technology
Energy demand promotes the exploitation of offshore oil and gas resource, and the importance of subsea pipeline highlights day by day.Marine oil and gas accounts for 70% of Global Oil Sweet natural gas total reserves.China's sea-bottom oil-gas rich reserves, only the South Sea is just up to 230 hundred million to 300 hundred million tons, wherein more than 60% concentrates on deep-sea, but China's development ability be only limitted to 300 meters within shallow sea.Deep-sea Pipeline Steel Development is key problem in technology; severe deep-marine-environment proposes the specification of quality higher than terrestrial pipeline to subsea pipeline, and the transverse strength requiring steel pipe high, longitudinal strength, high low temperature arrest toughness, good weldability, Chinese People's Anti-Japanese Military and Political College's strain property, part oil gas medium also require anti-H2S corrosive power.The exploitation in deep water hydrocarbon field proposes higher stricter requirement to oil and gas pipes, as high pressure conquassation, high-ductility, high fatigue, sea-water corrosion etc.Meanwhile, along with the increase of the depth of water, require that pipeline must have enough thickness and intensity; The increase of steel plate thickness and intensity significantly improves the requirement to product design and production, comprising the problems such as control and cooling uniformity of the obdurability guarantee of thick steel plates, homogeneity of structure and refinement, segregation and banded structure.
At present, the research of Submarine pipeline steel is few, is domesticly still in the starting stage especially, research and development and the shallow sea steel for pipe mostly being little wall thickness (thickness is less than 20mm), inferior grade (below X70 level) produced.
" a kind of steel plate for making subsea pipeline and rolling method thereof " (CN101082108), disclose a kind of hot-rolled tube coil of wire plate, chemical component weight per-cent is C:0.030% ~ 0.075%, Si:0.10% ~ 0.30%, Mn:1.40% ~ 1.60%, P≤0.015%, S≤0.003%, Cu≤0.20%, Ni:0.10% ~ 0.25%, Mo:0.07% ~ 0.20%, Nb:0.03% ~ 0.05%, Ti:0.001% ~ 0.02%, Al:0.01% ~ 0.06%, Cr≤0.20%, N≤0.009%, Ca:0.001% ~ 0.005%, B≤0.0005%, Sn≤0.010%, As≤0.030%, its thickness is 6-14mm,-15 DEG C of impelling strength averages are at below 350J, be not suitable for the raw material as deep-sea pipeline.
" pipe line steel that hic resistance is excellent and the line pipe produced with these steel thereof " (CN1914341), the chemical component weight per-cent of disclosed pipe line steel is C:0.03% ~ 0.15%, Si:0.05% ~ 1.0%, Mn:0.5% ~ 1.80%, P≤0.015%, S≤0.004%, O≤0.01%, N≤0.007%, Ti≤0.024%, Al:0.010% ~ 0.10%, Ca:0.0003% ~ 0.02%, in addition, also containing Mo:0.01% ~ 1.0%, V:0.01% ~ 0.30%, Nb:0.003% ~ 0.10%, Cr:0.01% ~ 1.0%, at least one in B:0.0001% ~ 0.001%, the pipe line steel introduced and seamless tube have good erosion resistance, but the tough implementations of non-products Presentation, simultaneously, institute's steel plate thickness of introducing is all at below 20mm, and, modifier treatment is needed after rolling, add production process and cost.
" a kind of method improving pipeline steel block hammer performance " (CN101476026), disclose a kind of technique improving DWTT performance, but only can ensure the DWTT performance of-15 DEG C in the embodiment cited by it, impelling strength when its-20 DEG C is all at below 400J, and undeclared produced steel plate thickness and corrosion resistance nature.
" manufacture method of submerged pipeline steel pipe " (CN101701315), discloses a kind of making method of subsea pipeline welded tube, and its-25 DEG C of impelling strength are all at below 300J.Therefore, the research of prior art to 560MPa level think gauge deep-sea pipeline steel still has some deficits.
Summary of the invention
The object of the invention is to overcome the problems referred to above and not enough and a kind of thickness 30mm above 560MPa level think gauge deep-sea pipeline steel tube hot-rolled steel sheet and production method thereof are provided, its horizontal and vertical yield strength can reach 550MPa or more than 540MPa, horizontal and vertical tensile strength reaches 630MPa or more than 620MPa, laterally the impelling strength of-60 DEG C is more than or equal to 400J, laterally-20 DEG C of DWTT shear area are more than or equal to 85%, simultaneously, steel plate excellent corrosion resistance, within 96 hours, HIC test-results meets NACE0284 standard-required, be applicable to the raw material as manufacturing deep-sea oil gas conveying pipeline.
The present invention seeks to realize like this:
A kind of 560MPa level deep-sea pipeline hot-rolled steel sheet, the composition of this steel plate is as follows by weight percentage: C:0.04% ~ 0.09%, Si:0.18% ~ 0.45%, Mn:1.2% ~ 1.75%, P :≤0.020%, S≤0.003%, Nb≤0.08%, Ti≤0.025%, V≤0.03%, Mo≤0.20%, Cu≤0.25%, Ni:0.10% ~ 0.30%, Cr≤0.25%, N≤0.008%, Al:0.010% ~ 0.040%, Al/N >=2, and surplus is iron and inevitable impurity; The CEIIW of steel of the present invention controls 0.35% ~ 0.40%, CEPCM controls 0.15% ~ 0.19%, wherein:
CEIIW＝C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5，
CEPCM＝C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B。
Chemical composition design reason of the present invention is as follows:
C is the bioelement of proof strength, is to make thick steel plates have necessary intensity, and C content must ensure that lower limit is 0.04%, but C content increases, and the toughness of material, weldability and corrosion resistance can reduce, and therefore, the upper limit is set to 0.09%.
Si is effective deoxidant element, can also play strengthening effect, but Si too high levels can make the plasticity of steel and toughness reduce, and therefore setting its scope is 0.18% ~ 0.45%.
Mn is the effective element of proof strength, but the easy segregation of Mn, and its too high levels can affect toughness and erosion resistance, therefore it is considered herein that Mn content is controlled 1.2% ~ 1.75% comparatively suitable.
P, S are detrimental impurity element, can bring out segregation, and increase material fragility, therefore, its content is more low better.
Namely Nb, Ti are solution strengthening element, it is again carbonitride-forming elements, good thin crystalline substance and strengthening effect can be played, but its too high levels can affect toughness and weldability, simultaneously, Carbonitride Precipitation increases and is also harmful to Properties of HIC resistance, therefore, controls Nb, Ti at Nb≤0.08%, Ti≤0.025%.
Mo, Cr effectively can increase the hardening capacity of material, gain in strength and toughness, but too high levels has disadvantageous effect to material weldability, in addition, consider also will suitably set its upper limit, therefore control Mo, Cr at Mo≤0.20%, Cr≤0.25% from cost angle.
Ni, Cu play solution strengthening effect, can also improve solidity to corrosion, and simultaneously or austenite stable element, can provide hardening capacity, but its too high levels can affect economy and weldability, therefore the present invention controls at Ni:0.10% ~ 0.30%, Cu≤0.25%.
The existence of N can worsen the toughness of mother metal and welded heat affecting zone, and its content is no more than 0.008% and is advisable.
Al is the bioelement of deoxidation, therefore must ensure its content, but Al too high levels can make the inclusion in steel increase, and therefore, the content of Als controls to be advisable 0.010% ~ 0.040%.Al/N >=2 effectively can ensure the formation of deoxidation effect and Al-Ti-Mn compound compound, are conducive to improving cleanliness factor.
CE of the present invention
iIWcontrol 0.35% ~ 0.40%, CE
pCMcontrol 0.15% ~ 0.19%, both can ensure the obdurability of steel plate, have and steel plate can be made to have suitable weldability and deformability.
560MPa level think gauge deep-sea of the present invention pipeline hot-rolled steel sheet thickness is at more than 30mm.
The production method of a kind of 560MPa level deep-sea pipeline hot-rolled steel sheet comprises hot metal pretreatment, smelting, external refining, molding casting, controlled rolling, controlled cooling model, the Heating temperature 1160 ~ 1230 DEG C of continuously cast bloom in the operation of rolling, heat-up time 1.0-1.5min/mm, soaking zone soaking time is not less than 60min, this heating process can ensure material complete austenitizing, make the abundant solid solution of alloying element, too growing up of austenite crystal can be suppressed again simultaneously, rough rolling step adopts transverse and longitudinal rolling, reduction in pass is not less than 15%, transverse rolling deflection is not less than 30%, roughing end pass deformation is not less than 20%, roughing temperature 1000 ~ 1100 DEG C, this roughing technique can while the refinement of guarantee austenite recrystallization, reduce the difference of vertical horizontal organization, ensure good vertical lateral performance, final rolling temperature 750 ~ 830 DEG C, the finish rolling stage adds up deflection 60% ~ 75%, can abundant fining austenite grains size by controlled rolling, make austenite flattening simultaneously, increase phase transformation nucleation site, can also make to store certain strain energy in austenite, nucleation rate is improved, structure refinement after phase transformation, cooling velocity after rolling 15 ~ 35 DEG C/s, final cooling temperature 400 ~ 500 DEG C, air cooling afterwards, can obtain the complex tissue that obdurability mates good acicular ferrite+bainite+granular ferrite.
Application the present invention can obtain the 560MPa level think gauge deep-sea pipeline steel of more than thickness 30mm, its horizontal and vertical yield strength can reach 550MPa or more than 540MPa, horizontal and vertical tensile strength reaches 630MPa or more than 620MPa, laterally the impelling strength of-60 DEG C is more than or equal to 400J, laterally-20 DEG C of DWTT shear area are more than or equal to 85%, simultaneously, steel plate excellent corrosion resistance, within 96 hours, HIC test-results meets NACE0284 standard-required, is applicable to the raw material as manufacturing deep-sea oil gas conveying pipeline.
Accompanying drawing explanation
Fig. 1 is the embodiment of the present invention 1 microstructure metallograph.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention, according to the component proportion of technical scheme, carries out hot metal pretreatment, smelting, external refining, molding casting, controlled rolling, controlled cooling model.The chemical composition of embodiment of the present invention steel is in table 1.The main technologic parameters of embodiment of the present invention steel is in table 2.The over-all properties of embodiment of the present invention steel is in table 3.Embodiment of the present invention steel hic resistance assay is in table 4.
The chemical composition (wt%) of table 1 embodiment of the present invention steel
| Embodiment | C | Si | Mn | P | S | Nb | Ti | Ni |
| 1 | 0.070 | 0.26 | 1.61 | 0.007 | 0.001 | — | — | 0.21 |
| 2 | 0.059 | 0.31 | 1.66 | 0.008 | 0.001 | — | 0.022 | 0.24 |
| 3 | 0.040 | 0.45 | 1.75 | 0.012 | 0.002 | 0.01 | 0.006 | 0.14 |
| 4 | 0.068 | 0.27 | 1.40 | 0.010 | 0.002 | 0.04 | 0.011 | 0.28 |
| 5 | 0.047 | 0.18 | 1.37 | 0.008 | 0.002 | 0.06 | 0.024 | 0.22 |
| 6 | 0.088 | 0.18 | 1.23 | 0.011 | 0.001 | 0.08 | 0.015 | 0.12 |
| Embodiment | V | Cu | Mo | Cr | N | Als | CE IIW | CE PCM |
| 1 | 0.03 | — | 0.05 | — | 0.0033 | 0.022 | 0.37 | 0.169 |
| 2 | — | 0.12 | 0.16 | — | 0.0042 | 0.018 | 0.39 | 0.173 |
| 3 | — | 0.24 | — | — | 0.0051 | 0.037 | 0.35 | 0.156 |
| 4 | — | 0.14 | 0.12 | 0.24 | 0.0050 | 0.031 | 0.40 | 0.179 |
| 5 | — | 0.25 | 0.13 | 0.18 | 0.0045 | 0.038 | 0.37 | 0.155 |
| 6 | — | 0.06 | 0.20 | 0.16 | 0.0038 | 0.024 | 0.38 | 0.182 |
The main technologic parameters of table 2 embodiment of the present invention steel
The over-all properties of table 3 embodiment of the present invention steel
Table 4 embodiment of the present invention steel hic resistance assay
| Embodiment | CLR，％ | CTR，％ | CSR，％ | Check conclusion |
| 1 | 0 | 0 | 0 | Qualified |
| 2 | 0 | 0 | 0 | Qualified |
| 3 | 0 | 0 | 0 | Qualified |
| 4 | 0 | 0 | 0 | Qualified |
| 5 | 0 | 0 | 0 | Qualified |
| 6 | 0 | 0 | 0 | Qualified |
Claims (2)
1.560MPa level deep-sea pipeline hot-rolled steel sheet, it is characterized in that, the composition of this steel plate is as follows by weight percentage: C:0.04% ~ 0.09%, Si:0.18% ~ 0.45%, Mn:1.2% ~ 1.75%, P :≤0.020%, S≤0.003%, Nb≤0.08%, Ti≤0.025%, V≤0.03%, Mo≤0.20%, Cu≤0.25%, Ni:0.10% ~ 0.30%, Cr≤0.25%, N≤0.008%, Al:0.010% ~ 0.040%, Al/N >=2, and surplus is iron and inevitable impurity; The CEIIW of steel of the present invention controls 0.35% ~ 0.40%, CEPCM controls 0.15% ~ 0.19%, wherein:
CEIIW＝C+Mn/6+(Ni+Cu)/15+(Cr+Mo+V)/5，
CEPCM＝C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B。
2. a 560MPa level deep-sea according to claim 1 pipeline production method of hot milling steel plate, comprise smelting, continuous casting, rolling, direct quenching, tempering, it is characterized in that: the Heating temperature 1160 ~ 1230 DEG C of continuously cast bloom in the operation of rolling, heat-up time 1.0-1.5min/mm, soaking zone soaking time is not less than 60min; Rough rolling step adopts transverse and longitudinal rolling, and reduction in pass is not less than 15%, and transverse rolling deflection is not less than 30%, roughing end pass deformation is not less than 20%, roughing temperature 1000 ~ 1100 DEG C, final rolling temperature 750 ~ 830 DEG C, the finish rolling stage adds up deflection 60% ~ 75%; Cooling velocity after rolling 15 ~ 35 DEG C/s, final cooling temperature 400 ~ 500 DEG C, air cooling afterwards.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106282802A (en) * | 2016-11-04 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of production technology controlling pipe line steel Large Inclusions |
| CN107557662A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | Quenching and tempering type 800MPa levels low-cost and easy-to welds steel plate and its production method |
| CN108315540A (en) * | 2018-02-13 | 2018-07-24 | 鞍钢股份有限公司 | A kind of Pipeline Steel Plate production method that transverse and longitudinal performance difference is small |
| CN109680204A (en) * | 2019-01-21 | 2019-04-26 | 南京钢铁股份有限公司 | A kind of deep-sea acid-resistant pipeline steel and production method |
| CN109694991A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of tank plate that hydrogen induced cracking resistance can be excellent |
| CN109957730A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of high-ductility heavy wall deep-sea pipeline plate and its production method |
| CN112226699A (en) * | 2020-10-28 | 2021-01-15 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
| JP2021518488A (en) * | 2018-03-19 | 2021-08-02 | タタ スチール リミテッド | A steel composition conforming to the X-65 grade API 5L PSL-2 specification with enhanced hydrogen-induced cracking (HIC) resistance and a method for producing the steel. |
| CN113913695A (en) * | 2021-10-13 | 2022-01-11 | 鞍钢股份有限公司 | Corrosion-resistant and fatigue-resistant pipeline steel for underwater oil and gas production and production method thereof |
| CN113930685A (en) * | 2021-10-13 | 2022-01-14 | 鞍钢股份有限公司 | 700 MPa-grade high-plasticity-transformation precipitation strengthening pipeline steel plate and production method thereof |
| CN114134414A (en) * | 2021-11-12 | 2022-03-04 | 山东钢铁集团日照有限公司 | Low-yield-ratio high-toughness steel and preparation method thereof |
| CN114774659A (en) * | 2022-05-25 | 2022-07-22 | 新疆八一钢铁股份有限公司 | Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline |
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| CN107557662A (en) * | 2016-06-30 | 2018-01-09 | 鞍钢股份有限公司 | Quenching and tempering type 800MPa levels low-cost and easy-to welds steel plate and its production method |
| CN106282802A (en) * | 2016-11-04 | 2017-01-04 | 南京钢铁股份有限公司 | A kind of production technology controlling pipe line steel Large Inclusions |
| CN109694991A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of tank plate that hydrogen induced cracking resistance can be excellent |
| CN109957730B (en) * | 2017-12-14 | 2020-09-01 | 鞍钢股份有限公司 | High-plasticity thick-wall deep sea pipeline flat plate and production method thereof |
| CN109957730A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of high-ductility heavy wall deep-sea pipeline plate and its production method |
| CN108315540A (en) * | 2018-02-13 | 2018-07-24 | 鞍钢股份有限公司 | A kind of Pipeline Steel Plate production method that transverse and longitudinal performance difference is small |
| JP2021518488A (en) * | 2018-03-19 | 2021-08-02 | タタ スチール リミテッド | A steel composition conforming to the X-65 grade API 5L PSL-2 specification with enhanced hydrogen-induced cracking (HIC) resistance and a method for producing the steel. |
| CN109680204A (en) * | 2019-01-21 | 2019-04-26 | 南京钢铁股份有限公司 | A kind of deep-sea acid-resistant pipeline steel and production method |
| CN112226699A (en) * | 2020-10-28 | 2021-01-15 | 湖南华菱湘潭钢铁有限公司 | Production method of acid-resistant pipeline steel |
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| CN113913695A (en) * | 2021-10-13 | 2022-01-11 | 鞍钢股份有限公司 | Corrosion-resistant and fatigue-resistant pipeline steel for underwater oil and gas production and production method thereof |
| CN113930685A (en) * | 2021-10-13 | 2022-01-14 | 鞍钢股份有限公司 | 700 MPa-grade high-plasticity-transformation precipitation strengthening pipeline steel plate and production method thereof |
| CN114134414A (en) * | 2021-11-12 | 2022-03-04 | 山东钢铁集团日照有限公司 | Low-yield-ratio high-toughness steel and preparation method thereof |
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Application publication date: 20160420 |
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| RJ01 | Rejection of invention patent application after publication |