CN102304667A - X100 pipeline steel plate with good low temperature toughness and preparation method thereof - Google Patents
X100 pipeline steel plate with good low temperature toughness and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an X100 pipeline steel plate with good low temperature toughness and a preparation method thereof, belonging to the production technical field of the high strength pipeline steel. The steel comprises the following chemical compositions in percent by mass: 0.03-0.07% of C, 0.10-0.45% of Si, 1.50-1.79% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.02-0.06% of Alt, 0.05-0.10% of Nb, 0.02-0.08% of V, 0.005-0.040% of Ti, 0.20-0.50% of Ni, 0.20-0.50% of Mo, less than or equal to 0.008% of N, less than or equal to 0.0002% of H and the balance of Fe and inevitable impurity elements. The preparation method comprises the steps of molten iron desulfurization, smelting in a converter, secondary refining, continuous casting, heating, rolling, cooling and straightening. The X100 pipeline steel plate has the following advantages: the X100 steel plate has good low temperature toughness: for the Charpy impact toughness, the Charpy impact value (CNV) of a full-size 10*10*55mm V-shaped notched specimen is no less than 330J at -20 DEG C and the Charpy impact shear area is no less than 90%; and for the falling weight performance, the drop-weight test shear area (DWTT SA) of a full wall thickness specimen is no less than 85% at -20 DEG C.
Description
Technical field
The invention belongs to the high-strength line-pipe steel production technical field, particularly relate to X100 pipeline steel plate of a kind of excellent in low temperature toughness and preparation method thereof.
Background technology
Sweet natural gas receives people's attention just day by day as a kind of high Efficiency and Clean Energy Resources.Because natural-gas field generally is positioned at the remote Desert Area away from market, be one of key issue of Sweet natural gas industry development how safely, economically with natural gas transport to the consumption market always.Through technological innovation and adopt more high pressure and more high-intensity pipeline, be to reduce the valid approach of the long distances cost of Sweet natural gas.Improving transfer pressure is the most significantly trend of Sweet natural gas long-distance transport pipes development.The natural gas line transfer pressure is brought up to 14MPa from initial 0.2MPa in the period of 50.The raising of transfer pressure requires to adopt more high-intensity pipe line steel.Nowadays, X52, X60 and X65 pipe line steel that worldwide Long-distance Transmission Pipeline construction had been adopted from the past develop into the pipe line steel of taking as the leading factor with X70 and X80, and are developing X100～X120 superstrength pipe line steel.
The exploitation of X100 and X80 almost begins simultaneously, but the result of its practical application is far from each other.X80 has obtained to use widely in the world; Particularly got into since this century; Three X80 Sweet natural gas long-distance transport pipes (the former pipeline in summer Yangjing of the U.S., the transfering natural gas from the west to the east two wires pipeline of fall parent tube road and China) have been built in succession in North America and Asia; Make X80 Sweet natural gas long-distance transport pipes that the growth of the formula that leaps arranged, but the X100 pipeline still rest on the test section construction period so far.The following period of time before and after the international pipeline meeting in 2006; The research and development of X100 and X120 were once becoming focus; In the research and development of X100, the Technology of X100 pipe line steel and product performance have obtained certain progress to pipe line steel investigator unanimity all over the world with attention focusing.
But up to the present; Consult in the world document or patent about the X100 pipe line steel; The low-temperature flexibility index of X100 is all on the low side;-20 ℃ of Charpy-V impact power majorities are distributed between 150～290J; Therefore the brainstrust of pipe line steel industry was once thought; The X100 pipe line steel can not rely on the crack arrest of steel pipe self toughness, all will add crack stopper, and engineering cost will improve greatly.If the summer of X100 pipe line steel mother metal does not reach more than the 300J than impacting toughness, the large-scale engineering applications prospect of X100 product will be had a greatly reduced quality, and is unrealistic.Therefore have the X100 pipe line steel and the Technology thereof of good low-temperature flexibility, demand exploitation urgently.
Summary of the invention
The object of the present invention is to provide X100 pipeline steel plate of a kind of excellent in low temperature toughness and preparation method thereof, solved X100 low-temperature flexibility index shortcoming on the low side in the above prior art, product has from the crack arrest ability.
Said steel plate chemical ingredients of the present invention is: C:0.03～0.07%, Si:0.10～0.45%, Mn:1.50～1.79%; P :≤0.012%, S :≤0.003%, Alt:0.02～0.06%; Nb:0.05～0.10%; V:0.02～0.08%, Ti:0.005～0.040%, Ni:0.20～0.50%; Mo:0.20～0.50%; N :≤0.008%, H :≤0.0002%, surplus is Fe and inevitable impurity element; Be weight percentage.
Adopt above-mentioned chemical composition design, through RH vacuum-treat+reinforcement controlled rolling and controlled cooling, the present invention has prepared yield strength and has reached more than the 690MPa, and tensile strength is more than 760MPa, and yield tensile ratio is below 0.92;
Summer is than impacting toughness :-20 ℃, and full-scale 10 * 10 * 55mm v-notch sample, Charpy-V impact power (CNV) >=330J, the summer is than impacting shear area >=90%.
Preparing method of the present invention comprises desulfurizing iron, converter smelting, external refining, continuous casting, heating, rolling, cooling, aligning operation; The following technical parameter of control in technology:
(1) RH refining: argon flow amount 800～1200NL/min, vacuum processing time 15～35min.
(2) heating cycle: steel billet is heated to 1150-1250 ℃, soaking zone time 40～60min.
(3) rolling technology: steel billet is rolled in two stages; Temperature is treated in the centre, and fs finishing temperature 980-1060 ℃, intermediate blank treats that temperature thickness is controlled at 3-5 times of finished product thickness; The subordinate phase start rolling temperature is controlled at 840-890 ℃, and finishing temperature is controlled at 760-820 ℃ of scope.
(4) process for cooling: carry out water-cooled after the hot rolling fast, go into water temp and be controlled at 750-810 ℃, final cooling temperature is controlled at 90-190 ℃, and speed of cooling is controlled at 15-25 ℃/s.
The formation main points of content of the present invention are based on following understanding: Mn and are improved intensity through solution strengthening, also can reduce γ-α transformation temperature, and then the refinement ferrite crystal grain.But well-known, Mn is prone to segregation element, can cause the strand center segregation serious, and cause steel plate heart portion banded structure serious, causes anisotropy, causes impact fracture layering or brittle failure to occur, reduces the low-temperature flexibility performance and the anti-HIC performance of steel plate greatly.The present invention has carried out a large amount of tests, through adding different Mn content, finds: when the content of Mn greater than 1.90% the time, the tensile strength of steel plate is very high, but impelling strength is relatively poor; When the content of Mn was lower than 1.80%, through reasonable technique control, the toughness and tenacity of steel plate reached a coupling preferably, sees shown in the accompanying drawing 2.Therefore Mn content is controlled at 1.50～1.79% scopes among the present invention, has obtained the good toughness and tenacity of X100 pipe line steel.
Nb is one of topmost element in the modern microalloying pipe line steel, and solution strengthening and grain refining effect are remarkable.Separate out the austenitic answer of obstruction deformation, recrystallize through the strain inducing of Nb in the course of hot rolling (NC), when controlled rolling and controlled cooling makes the rolling deformed austenite in non-recrystallization zone of finish rolling stage in phase transformation, change tiny phase-change product into, thereby improve the obdurability of steel.In addition, the nano level Nb (NC) that separates out after the phase transformation also plays the deposition precipitating reinforcing effect, further improves the toughness and tenacity of big wall thickness pipe line steel.In the composition design, having added an amount of vanadium, mainly is that compound interpolation is used with Nb, suppresses growing up of austenite crystal through the fine precipitate of NbV in the heat-processed (CN) in austenite, and simultaneously, the interpolation of an amount of vanadium alloy can improve the X100 strength stability.
Mo: stronger bainitic transformation control element.In high strength microalloy steel, add an amount of Mo element and just can obtain tangible bainite structure, because of phase transformation changes to the low temperature direction, can make the further refinement of phase-change organization simultaneously, significantly improve the toughness and tenacity of steel, also can effectively reduce yield tensile ratio simultaneously.In the strong X100 pipe line steel of superelevation, through adding a certain amount of Mo alloy, realize the phase transformation strengthening effect, improve the strength stability and its low-temperature impact toughness of raising of X100 pipe line steel.Therefore Mo content is controlled at 0.20～0.50% scope among the present invention, has obtained tiny and uniform ferrite bainite tissue and good toughness and tenacity.
Ni: nickelalloy can improve the intensity of steel through the solution strengthening effect, remedies in the thick specification steel strength degradation that the increase because of thickness causes, improves the low-temperature flexibility of thick specification pipe line steel simultaneously.In the strong X100 pipe line steel of superelevation, the Ni alloy is used to improve strength stability and the low-temperature flexibility performance of X100.The present invention is through a large amount of evidences, and when Ni content is controlled at 0.20% when following, the Charpy-V impact power of steel plate changes not quite basically, when the Ni alloy that adds more than 0.20%, along with the increase of Ni content, can increase substantially the low-temperature flexibility of X100 steel plate.
Adopt the foundation of this production technique to be: under the condition of the dark vacuum of RH refining furnace, strong mixing; Nitrogen-atoms in the steel, hydrogen atom are easy to the Ar bubble diffusion in molten steel; Like this along with the come-up of Ar bubble in steel; Nitrogen content and hydrogen richness in the steel constantly reduce; Through strengthening argon flow amount and prolonging vacuum processing time; Make that gas content is low in the molten steel, inclusion is few, the molten steel cleanliness factor is high, for the low-temperature flexibility that improves product lays the first stone.Through control slab heating temperature and steel billet soaking time, guarantee the abundant dissolving of second phase, and effectively suppress original austenite grains and grow up; Control fs finishing temperature and intermediate blank simultaneously and treat temperature thickness, make abundant refinement of austenite crystal and homogenizing; Subordinate phase adopts low temperature controlled rolling; Its key is under lower rolling temperature, to accomplish the distortion of subordinate phase; Start rolling temperature is controlled at 840-890 ℃ of scope; And guarantee to stop rolling temperature 760-820 ℃ of scope; Make full use of low temperature controlled rolling effect; In hardened austenite inner accumulation dislocation; For follow-up phase transformation provides more forming core point; Finally through rolling back entry fast; Began to quicken cooling in the past in phase transformation; Obtain refinement, even, flat bainitic transformation tissue, improve the intensity and the low-temperature flexibility of X100 steel plate.The present invention has carried out a large amount of tests, through adopting different final cooling temperatures, finds: when final cooling temperature during greater than 300 ℃, the tensile strength of steel plate reaches the X100 standard-required basically, but the summer is more relatively poor than impacting toughness; When final cooling temperature during less than 200 ℃, the toughness and tenacity of steel plate reaches a coupling preferably, and tensile strength is high, and the summer than impacting good-toughness, see shown in the accompanying drawing 3.Therefore final cooling temperature is controlled at 90～190 ℃ of scopes among the present invention, has obtained X100 pipe line steel good low-temperature flexibility.
The invention has the advantages that: the X100 pipeline steel plate of the excellent in low temperature toughness of the present invention's preparation has adopted unique composition design and production process system, and product has and can impact toughness from the summer of crack arrest ratio.Through lot of test, limited the influential easy segregation element Mn of low-temperature flexibility, P, S etc. in the composition design, having improved has suitable alloy element Nb, Mo, Ni etc. to grain refining and phase transformation strengthening, has improved the intensity and the low-temperature flexibility of product.Its production technique adopts the control control refrigeration technique of RH refining techniques and optimization, reduced in the molten steel the deleterious elemental gas N of low-temperature flexibility, H etc., refinement austenite crystal and bainite structure, product has higher strength and toughness and mates.The X100 pipe line steel plate of moderate thickness performance of producing according to the described technical scheme of this patent reaches following level:
(1) tensile property: yield strength reaches>=690MPa, and tensile strength reaches>=760MPa, and yield tensile ratio reaches≤0.92 scope.
(2) toughness properties: 10 * 10 * 55mm sample summer of-20 ℃ than v-notch ballistic work more than 330J ,-20 ℃ block hammer performance (DWTT) average shear area >=85%.
Description of drawings
Fig. 1 is metallographic structure figure of the present invention.
Fig. 2 is the influence of different Mn content among the present invention to the steel plate obdurability.
Fig. 3 is the influence of different final cooling temperatures among the present invention to the steel plate obdurability.
Embodiment
X100 pipeline steel plate of a kind of excellent in low temperature toughness and preparation method thereof is smelted in 100 tons of converters according to the present invention, and controlled rolling and controlled cooling production is carried out in refining on 100 tons of RH refining furnaces on the 4300mm production line.Through embodiment the present invention is done further description below.Embodiment light plate chemical ingredients is seen table 1, and embodiment process system face is as follows described, and the embodiment mechanical property is seen table 2:
The embodiment chemical ingredients
Table 1. excellent in low temperature toughness X100 of the present invention pipe line steel plate embodiment chemical ingredients (wt%)
The embodiment process system
Embodiment 1
The thick 22.0mm of product specification, the steel plate of wide 3725mm, RH refining furnace argon flow amount adopts 1200NL/min, vacuum processing time 20min.Slab heating temperature: 1160 ℃, soaking zone time 60min; 1000 ℃ of fs finishing temperatures are treated temperature thickness 3t, 840 ℃ of subordinate phase start rolling temperatures, and it is 780 ℃ that steel plate stops rolling temperature; Roll the back and get into the water-cooled zone fast, going into water temp is 770 ℃, and final cooling temperature is 90 ℃, and cooling rate is 15 ℃/s.The steel plate comprehensive mechanical property sees the following form shown in 2.
Embodiment 2
The thick 22.0mm of product specification, the steel plate of wide 3725mm, RH refining furnace argon flow amount adopts 1100NL/min, vacuum processing time 21min.Slab heating temperature: 1180 ℃, soaking zone time 50min; 1010 ℃ of fs finishing temperatures are treated temperature thickness 3.5t, 850 ℃ of subordinate phase start rolling temperatures, and it is 790 ℃ that steel plate stops rolling temperature; Roll the back and get into the water-cooled zone fast, going into water temp is 780 ℃, and final cooling temperature is 190 ℃, and cooling rate is 20 ℃/s.The steel plate comprehensive mechanical property sees the following form shown in 2.
Embodiment 3
The thick 18.4mm of product specification, the steel plate of wide 3725mm, RH refining furnace argon flow amount adopts 1000NL/min, vacuum processing time 25min.Slab heating temperature: 1200 ℃, soaking zone time 50min; 1020 ℃ of fs finishing temperatures are treated temperature thickness 3.5t, 870 ℃ of subordinate phase start rolling temperatures, and it is 800 ℃ that steel plate stops rolling temperature; Roll the back and get into the water-cooled zone fast, going into water temp is 790 ℃, and final cooling temperature is 150 ℃, and cooling rate is 22 ℃/s.The steel plate comprehensive mechanical property sees the following form shown in 2.
Embodiment 4
The thick 15.0mm of product specification, the steel plate of wide 3118mm, RH refining furnace argon flow amount adopts 900NL/min, vacuum processing time 30min.Slab heating temperature: 1220 ℃, soaking zone time 40min; 1040 ℃ of fs finishing temperatures are treated temperature thickness 4t, 890 ℃ of subordinate phase start rolling temperatures, and it is 810 ℃ that steel plate stops rolling temperature; Roll the back and get into the water-cooled zone fast, going into water temp is 800 ℃, and final cooling temperature is 120 ℃, and cooling rate is 23 ℃/s.The steel plate comprehensive mechanical property sees the following form shown in 2.
Embodiment 5
The thick 15.0mm of product specification, the steel plate of wide 3118mm, RH refining furnace argon flow amount adopts 900NL/min, vacuum processing time 35min.Slab heating temperature: 1220 ℃, soaking zone time 60min; 1050 ℃ of fs finishing temperatures are treated temperature thickness 5t, 890 ℃ of subordinate phase start rolling temperatures, and it is 810 ℃ that steel plate stops rolling temperature; Roll the back and get into the water-cooled zone fast, going into water temp is 800 ℃, and final cooling temperature is 100 ℃, and cooling rate is 25 ℃/s.The steel plate comprehensive mechanical property sees the following form shown in 2.
The embodiment mechanical property
The metallographic structure of the X100 pipe line steel plate of moderate thickness of the excellent in low temperature toughness that the present invention produces is even tiny ferrite bainite tissue morphology, with reference to accompanying drawing 1.Embodiment steel plate mechanical property is as shown in table 2 below.
Table 2. embodiment X100 steel plate mechanical property
The present invention passes through the special alloy formula of employing, utilizes and quickens cooling rate device (ACC), realizes the very low temperature phase transformation, abundant refinement phase-change organization, the intensity and the toughness of raising X100 pipe line steel.Suitably improve argon flow amount and prolong vacuum processing time through the RH refining furnace simultaneously, make that gas content is low in the molten steel, inclusion is few, the molten steel cleanliness factor high, for the low-temperature flexibility that improves product lays the first stone.The X100 pipeline steel plate that the present invention produces;-20 ℃ of summers have reached more than the 330J than impacting toughness; Make the X100 pipe line steel self have from the crack arrest ability; Do not need to add again crack stopper; Engineering cost will reduce greatly; Make the large-scale engineering applications prospect of X100 product become possibility, can be widely used in the oil and gas pipeline engineering construction in the near future.
Claims (3)
1. the X100 pipeline steel plate of an excellent in low temperature toughness; It is characterized in that: said steel plate chemical ingredients is: C:0.03～0.07%; Si:0.10～0.45%; Mn:1.50～1.79%; P :≤0.012%; S :≤0.003%; Alt:0.02～0.06%, Nb:0.05～0.10%, V:0.02～0.08%; Ti:0.005～0.040%; Ni:0.20～0.50%, Mo:0.20～0.50%, N :≤0.008%; H :≤0.0002%, surplus is Fe and inevitable impurity element; Be weight percentage.
2. the X100 pipeline steel plate of excellent in low temperature toughness as claimed in claim 1, it is characterized in that: the performance of steel plate is:
Yield strength reaches more than the 690MPa, and tensile strength is more than 760MPa, and yield tensile ratio is below 0.92;
Summer is than impacting toughness :-20 ℃, and full-scale 10 * 10 * 55mm v-notch sample, Charpy-V impact power (CNV) >=330J, the summer is than impacting shear area >=90%;
Block hammer performance :-20 ℃, the total wall thickness sample shear area (DWTT SA) >=85% of dropping hammer.
3. the preparation method of the X100 pipeline steel plate of the described excellent in low temperature toughness of claim 1; Comprise desulfurizing iron, converter smelting, external refining, continuous casting, heating, rolling, cooling, aligning operation, it is characterized in that: the following technical parameter of control in the technology:
(1) RH refining: argon flow amount 800～1200NL/min, vacuum processing time 15～35min;
(2) heating cycle: steel billet is heated to 1150-1250 ℃, soaking zone time 40～60min;
(3) rolling technology: steel billet is rolled in two stages; Temperature is treated in the centre, and fs finishing temperature 980-1060 ℃, intermediate blank treats that temperature thickness is controlled at 3-5 times of finished product thickness; The subordinate phase start rolling temperature is controlled at 840-890 ℃, and finishing temperature is controlled at 760-820 ℃ of scope;
(4) process for cooling: carry out water-cooled after the hot rolling fast, go into water temp and be controlled at 750-810 ℃, final cooling temperature is controlled at 90-190 ℃, and speed of cooling is controlled at 15-25 ℃/s.
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| CN102534429A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | High-strength low-yield ratio X90 hot-rolled steel plate and production method thereof |
| CN103540714A (en) * | 2013-10-12 | 2014-01-29 | 首钢总公司 | Method for smelting high-grade pipe line steel with RH single-link process |
| CN104080937A (en) * | 2012-01-30 | 2014-10-01 | 杰富意钢铁株式会社 | Base metal for high-toughness clad steel plate giving weld with excellent toughness, and process for producing clad steel plate |
| CN104998901A (en) * | 2015-08-10 | 2015-10-28 | 首钢总公司 | Hot rolling technology for pipeline rolled steel plate |
| CN106563695A (en) * | 2016-11-07 | 2017-04-19 | 河钢股份有限公司邯郸分公司 | Low-yield-ratio high-strength pipeline steel production method |
| CN111451277A (en) * | 2020-03-30 | 2020-07-28 | 包头钢铁（集团）有限责任公司 | X65 pipeline steel plate and plate shape control method thereof |
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| CN104080937A (en) * | 2012-01-30 | 2014-10-01 | 杰富意钢铁株式会社 | Base metal for high-toughness clad steel plate giving weld with excellent toughness, and process for producing clad steel plate |
| CN104080937B (en) * | 2012-01-30 | 2016-05-11 | 杰富意钢铁株式会社 | The mother metal of high tenacity clad steel plate of excellent in toughness of welded zone and the manufacture method of this clad steel plate |
| CN102534429A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | High-strength low-yield ratio X90 hot-rolled steel plate and production method thereof |
| CN103540714A (en) * | 2013-10-12 | 2014-01-29 | 首钢总公司 | Method for smelting high-grade pipe line steel with RH single-link process |
| CN104998901A (en) * | 2015-08-10 | 2015-10-28 | 首钢总公司 | Hot rolling technology for pipeline rolled steel plate |
| CN106563695A (en) * | 2016-11-07 | 2017-04-19 | 河钢股份有限公司邯郸分公司 | Low-yield-ratio high-strength pipeline steel production method |
| CN111451277A (en) * | 2020-03-30 | 2020-07-28 | 包头钢铁（集团）有限责任公司 | X65 pipeline steel plate and plate shape control method thereof |
| CN111482459A (en) * | 2020-03-30 | 2020-08-04 | 包头钢铁（集团）有限责任公司 | X60 pipeline steel plate and plate shape control method thereof |
| CN117535578A (en) * | 2024-01-09 | 2024-02-09 | 江苏沙钢集团有限公司 | Production and manufacturing method for improving drop hammer performance of hot rolled steel plate for low-temperature station yard pipe |
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