CN103276293A - Production method of excellent hydrogen induced cracking resistant pipeline steel plate - Google Patents
Production method of excellent hydrogen induced cracking resistant pipeline steel plate Download PDFInfo
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- CN103276293A CN103276293A CN2013102250350A CN201310225035A CN103276293A CN 103276293 A CN103276293 A CN 103276293A CN 2013102250350 A CN2013102250350 A CN 2013102250350A CN 201310225035 A CN201310225035 A CN 201310225035A CN 103276293 A CN103276293 A CN 103276293A
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Abstract
The invention discloses a production method of an excellent hydrogen induced cracking resistant pipeline steel plate. according to the production method, technologies of pretreatment of hot metal for efficient desulfuration, tapping and preliminary refining for strong deoxidation and refining for deep desulphurization are adopted, wherein vacuum pressure is less than or equals to 3mbar and the processing time is 18-20min; casting is carried out by high degree of superheat, and meanwhile, by soft press technology, press efficiency is raised; protective casting and sealing are adopted to avoid secondary oxidation and increasing N; high degree of superheat makes macrostructure of a casting blank center to be a columnar crystal structure, and the center macrostructure of the casting blank is improved; the casting blank is heated to 1150-1220 DEG C, in-furnace time is 180-235min, and out-furnace temperature is 1150-1220 DEGC; rough rolling temperature is 950-1150 DEG C, and finish rolling temperature is 890-945 DEG C; and laminar cooling is finally carried out at the cooling rate of 10-30 DEG C/s so as to obtain the excellent hydrogen induced cracking resistant pipeline steel plate. By the adoption of the production method, excellent hydrogen induced cracking resistance can be achieved, and product quality is stable and controllable.
Description
Technical field
The present invention relates to a kind of pipeline steel plate, specifically a kind of production method of excellent in hydrogen-induced cracking resistance pipeline steel plate.
Background technology
21 century is the epoch of China's natural gas great development.West-East National Gas Transmission Project is the western prelude engineering of opening greatly.Along with the startup of West-East National Gas Transmission Project, the new upsurge of a NG Pipeline Construction arrives.Pipe-line transportation is the important development trend of natural gas line.Along with environment for use is abominable further, carry for high pressure, long distance: high strength; Heavy wall, big caliber.Change: low-temperature flexibility extremely coldly; Welding property.Corrosive environment: anti-hydrogen induced cracking HIC; Stress corrosion dehiscence resistant SCC.Harsher to performance requriements accordingly: high strength; Excellent low temperature impact toughness; The good welds performance; The performance of anti-stress-corrosion crack and hydrogen induced cracking.Thereby the purity to molten steel requires higher: [S]: 20 ~ 3ppm; [P]: 120 ~ 50ppm; [H]: ￡ 2ppm; Non-metallic inclusion control is strict.Require stricter to control strand center segregation.Simultaneously type, distribution and the homogeneity of tissue are had higher requirement.At present, traditional smelting, rolling technology can not satisfy pipeline steel plate antagonism hydrogen induced cracking performance demands.
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Summary of the invention
In order to overcome the problem that prior art exists, the purpose of this invention is to provide a kind of production method of excellent in hydrogen-induced cracking resistance pipeline steel plate.Obtain ferrite/bainite type tissue by this method, MA island tissue content is less relatively, and very excellent anti-hydrogen induced cracking performance is arranged.
The objective of the invention is to be achieved through the following technical solutions:
A kind of production method of excellent in hydrogen-induced cracking resistance pipeline steel plate is characterized in that this method steps is as follows:
(1) smelt: adopt hot metal pretreatment high-efficiency desulfurization, the tapping strong deoxidation of preliminary refining and the dark sulphur technology of refining, and the strict RH refinery practice treatment time, wherein, the treatment time of vacuum pressure≤3mbar is 18-20min;
(2) continuous casting: adopt high superheating temperature to pour into a mould, adopt simultaneously and gently depress technology, improve and depress efficient, adopt and keep cast and sealing, avoid secondary oxidation and increase N; It is columnar crystal structure that high superheating temperature makes the macrostructure base at strand center, improves the center macrostructure of strand; The superheating temperature that high superheating temperature cast is adopted is 25 ℃-50 ℃; When gently depressing technology, total reduction is 3.5-8mm.
(3) rolling technology: continuously cast bloom is heated to 1150-1220 ℃, and time inside furnace is 180～235min, and tapping temperature is 1150-1220 ℃; The roughing temperature is 950～1150 ℃, and final rolling temperature is 890～945 ℃; Laminar flow cooling subsequently, 10～30 ℃/s of rate of cooling; Obtain the pipeline steel plate of excellent in hydrogen-induced cracking resistance.
Among the present invention, the composition of pipeline steel plate is C 0.01～0.06% by weight percentage, Si 0.05～0.35%, and Mn 0.95～1.70%, P≤0.014%, S≤0.0040%, Nb 0.025～0.055%, and Ti 0.002～0.020%, Ni≤0.30%, Al 0.010～0.050%, and surplus is Fe and impurity.The pipeline steel plate of the excellent in hydrogen-induced cracking resistance that obtains is ferrite/bainite type tissue, and MA island tissue content is few.
When the superheating temperature of casting was hanged down, the central tissue of strand was equiax crystal; When superheating temperature was higher, the central tissue of strand was column crystal substantially; In low overheat when casting,, the central negative segregation is distributed in the equiax crystal district of whole strand, and this moment is corresponding, and to roll plate thickness central tissue thick and obvious, and feasible ununiformity of rolling the plate tissue is more obvious.By contrast, centered by the strand during positive segregation, it is more even to roll organizing of plate, adopts the technology of dynamically gently depressing to produce strand simultaneously, and the degree of semimacrosegregation alleviates greatly.
The present invention passes through, and low carbonization, high purification and calcium treatment process, Control and Inclusion Removal, center segregation control, composition are precisely controlled, the metallographic structure type guarantees precisely to control the performance of product with the control of distribution, and guarantee stable delivery.
The present invention has following advantage:
1, by the optimization production flow process, guarantees low carbonization, high purification and calcium treatment process, Control and Inclusion Removal.Having reduced steel [S] and T[O] content to be to reduce The amount of inclusions and size; Calcium is handled sulfide inclusion in the steel is carried out upgrading (inclusion morphology control), thereby prevents that crackle from producing.
2, metallographic structure is accurately controlled, accurately controlled to segregation control, composition.Reduce [C], [Mn], [P] content, reduce strand center segregation (adopt and gently depress), control homogeneity of structure and distribution (accurately the back cooling is rolled in control), reduce banded structure and the content of controlling fragility phase MA island tissue, reduce the reverse casehardening tissue, prevent the hydrogen induced cracking expansion, realize that the product performance high-quality is stable.
The present invention is by the optimization to smelting technology, continuous casting process, heating process, rolling technology, produce the strand that obtains according to this method, the center is columanar structure, the semimacrosegregation degree is light, the trap of seizure hydrogen and the zone that other defective is assembled have been reduced, obtain comparatively desirable continuous casting billet structure, rolling steel plate metallographic structure homogeneity afterwards is better, has anti-hydrogen induced cracking performance preferably.The plate property that this method is produced is stable, and is simple for process, is beneficial to batch process.
Description of drawings
Fig. 1-1 is the macrostructure shape appearance figure as a result of embodiment 1 different sites.
Fig. 1-2 is the macrostructure shape appearance figure as a result of embodiment 2 different sites.
Fig. 2-1 is the strand segregation of embodiment 1 and organizes corresponding relation figure.
Fig. 2-the 2nd, the strand segregation of embodiment 2 with organize corresponding relation figure.
Fig. 3 is for obtaining pipeline steel plate typical figure of tissue topography under metaloscope after embodiment 1 hot rolling.
Fig. 4 is for obtaining pipeline steel plate typical figure of tissue topography under metaloscope after embodiment 2 hot rollings.
Embodiment
A kind of pipeline steel plate that improves the pipeline steel plate of impelling strength, its composition is as shown in table 1 by weight percentage.Wherein: embodiment 1 is cast cold, and molten steel overheat is 11 ℃, and embodiment 2 is the high temperature cast, and molten steel overheat is 25 ℃-50 ℃.
Smelting technology: adopt hot metal pretreatment high-efficiency desulfurization (S≤0.002%), the strong deoxidation of tapping preliminary refining (adding the aluminium block deoxidation in the tapping process), the dark sulphur technology of refining, (vacuum pressure (≤3mbar) treatment time be 18-20min), calcium is handled (inclusion modification processing) to the RH refinery practice.
Continuous casting process: embodiment 1 is cast cold, embodiment 2 is high temperature cast (molten steel overheat is 25 ℃-50 ℃), dynamically (total reduction is 3.5-8mm to the technology of gently depressing, improve and depress efficient), cast and seal operation are kept in enforcement, especially strictness is opened and is watered heat, avoids secondary oxidation and increases N.When the superheating temperature of casting was hanged down, the central tissue of strand was equiax crystal; When superheating temperature was higher, the central tissue of strand was column crystal substantially; In low overheat when casting,, the central negative segregation is distributed in the equiax crystal district of whole strand, and this moment is corresponding, and to roll plate thickness central tissue thick and obvious, and feasible ununiformity of rolling the plate tissue is more obvious.By contrast, centered by the strand during positive segregation, it is more even to roll organizing of plate, adopts the technology of dynamically gently depressing to produce strand simultaneously, and the degree of semimacrosegregation alleviates greatly.Fig. 1-1 is the macrostructure shape appearance figure as a result of embodiment 1 different sites.Fig. 1-2 is the macrostructure shape appearance figure as a result of embodiment 2 different sites.Fig. 2-1 is the strand segregation of embodiment 1 and organizes corresponding relation figure.Fig. 2-the 2nd, the strand segregation of embodiment 2 with organize corresponding relation figure.
Cooling controlling and rolling controlling process: continuously cast bloom is heated to 1150-1220 ℃, and time inside furnace is 180～235min, and tapping temperature is 1150-1220 ℃; The roughing temperature is 950～1150 ℃, and final rolling temperature is 890～945 ℃; Laminar flow cooling subsequently, 10～30 ℃/s of rate of cooling.
Fig. 3,4 obtains pipeline steel plate typical figure of tissue topography under metaloscope after being the embodiment hot rolling.Homogeneous microstructure is tiny.Examine Fig. 3,4, can find ferrite/bainite type tissue, MA island tissue content is less relatively.Wherein equiax crystal in irregular shape also can be judged to be bainite.Because carbon content is low, island is few, and the characteristics that quasi-polygonal ferrite in irregular shape interweaves mutually and distributes make the toughness of steel fabulous when satisfying hardness of steel, has excellent anti-hydrogen induced cracking performance.Mechanics tensile property such as table 2.
The chemical ingredients of table 1 embodiment of the invention (wt%)
| Embodiment | C | Si | Mn | P | S | Alt | Nb | Ti | Cu |
| Embodiment 1 | 0.05 | 0.26 | 1.50 | 0.010 | 0.0020 | 0.029 | 0.055 | 0.008 | 0.18 |
| Embodiment 2 | 0.05 | 0.27 | 1.43 | 0.011 | 0.0021 | 0.032 | 0.051 | 0.013 | 0.17 |
Table 2 mechanical property
| Embodiment | Yield strength | Tensile strength | Unit elongation | Impact value 1 | Impact value 2 | Impact value 3 | Impact value is average |
| Embodiment 1 | 497 | 530 | 32 | 258 | 303 | 300 | 287 |
| Embodiment 2 | 505 | 550 | 43 | 434 | 442 | 455 | 457 |
As can be seen, embodiment 1,2 mechanical property all reach the requirement of X65 in the API 5L standard, and unit elongation 〉=27% has reached the requirement of X65 pipe line steel.But obviously the impact property of embodiment 2 is better.Adopt the continuous casting method of high superheating temperature simple, the over-all properties of material is improved.
Claims (4)
1. the production method of an excellent in hydrogen-induced cracking resistance pipeline steel plate is characterized in that this method steps is as follows:
(1) smelt: adopt hot metal pretreatment high-efficiency desulfurization, the tapping strong deoxidation of preliminary refining and the dark sulphur technology of refining, and the strict RH refinery practice treatment time, wherein, the treatment time of vacuum pressure≤3mbar is 18-20min;
(2) continuous casting: adopt high superheating temperature to pour into a mould, adopt simultaneously and gently depress technology, improve and depress efficient, adopt and keep cast and sealing, avoid secondary oxidation and increase N; It is columnar crystal structure that high superheating temperature makes the macrostructure base at strand center, improves the center macrostructure of strand;
(3) rolling technology: continuously cast bloom is heated to 1150-1220 ℃, and time inside furnace is 180～235min, and tapping temperature is 1150-1220 ℃; The roughing temperature is 950～1150 ℃, and final rolling temperature is 890～945 ℃; Laminar flow cooling subsequently, 10～30 ℃/s of rate of cooling; Obtain the pipeline steel plate of excellent in hydrogen-induced cracking resistance.
2. the production method of excellent in hydrogen-induced cracking resistance pipeline steel plate according to claim 1, it is characterized in that: the composition of pipeline steel plate is C 0.01～0.06% by weight percentage, Si 0.05～0.35%, and Mn 0.95～1.70%, P≤0.014%, S≤0.0040%, Nb 0.025～0.055%, and Ti 0.002～0.020%, Ni≤0.30%, Al 0.010～0.050%, and surplus is Fe and impurity.
3. the production method of excellent in hydrogen-induced cracking resistance pipeline steel plate according to claim 1 is characterized in that: the superheating temperature that high superheating temperature cast is adopted is 25 ℃-50 ℃; When gently depressing technology, total reduction is 3.5-8mm.
4. the production method of excellent in hydrogen-induced cracking resistance pipeline steel plate according to claim 1, it is characterized in that: the pipeline steel plate of the excellent in hydrogen-induced cracking resistance that obtains is ferrite/bainite type tissue, and MA island tissue content is few.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602775A (en) * | 2013-12-09 | 2014-02-26 | 南京钢铁股份有限公司 | Method for effectively controlling generation of central cracks in medium-carbon steel plate |
| CN104451346A (en) * | 2014-11-29 | 2015-03-25 | 首钢总公司 | Smelting method of yield 345MPa grade hydrogen cracking-resistant container steel |
| CN107876720A (en) * | 2017-10-12 | 2018-04-06 | 首钢集团有限公司 | A kind of production technology of anti-hydrogen induced cracking C Mn steel |
| CN109881095A (en) * | 2019-03-14 | 2019-06-14 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and smelting process |
| CN110114490A (en) * | 2016-12-22 | 2019-08-09 | 株式会社Posco | Thick steel sheet and its manufacturing method with 450MPa grades of tensile strength and excellent hydrogen-induced cracking resistance |
| CN110846565A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method thereof |
| WO2020093711A1 (en) * | 2018-11-07 | 2020-05-14 | 南京钢铁股份有限公司 | Low-steel-grade pipeline clean steel and smelting process therefor |
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| CN102286690A (en) * | 2011-08-30 | 2011-12-21 | 南京钢铁股份有限公司 | Pipeline steel plate capable of resisting hydrogen-induced cracking and production method thereof |
| CN102644018A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Smelting process used for plate blanks of medium and heavy plates of hydrogen induced cracking resistant pipeline steel |
| CN102676725A (en) * | 2012-05-29 | 2012-09-19 | 南京钢铁股份有限公司 | Method for controlling nonmetal inclusions in X70 stage acidoresistant pipeline steel |
| CN102990030A (en) * | 2012-12-17 | 2013-03-27 | 南京钢铁股份有限公司 | Continuous casting process for controlling semi-macroscopic segregation of H2S corrosion resisting steel casting blank |
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| CN102644018A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Smelting process used for plate blanks of medium and heavy plates of hydrogen induced cracking resistant pipeline steel |
| CN102676725A (en) * | 2012-05-29 | 2012-09-19 | 南京钢铁股份有限公司 | Method for controlling nonmetal inclusions in X70 stage acidoresistant pipeline steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602775A (en) * | 2013-12-09 | 2014-02-26 | 南京钢铁股份有限公司 | Method for effectively controlling generation of central cracks in medium-carbon steel plate |
| CN104451346A (en) * | 2014-11-29 | 2015-03-25 | 首钢总公司 | Smelting method of yield 345MPa grade hydrogen cracking-resistant container steel |
| CN110114490A (en) * | 2016-12-22 | 2019-08-09 | 株式会社Posco | Thick steel sheet and its manufacturing method with 450MPa grades of tensile strength and excellent hydrogen-induced cracking resistance |
| CN107876720A (en) * | 2017-10-12 | 2018-04-06 | 首钢集团有限公司 | A kind of production technology of anti-hydrogen induced cracking C Mn steel |
| CN107876720B (en) * | 2017-10-12 | 2019-04-23 | 首钢集团有限公司 | A kind of production technology of anti-hydrogen induced cracking C-Mn steel |
| WO2020093711A1 (en) * | 2018-11-07 | 2020-05-14 | 南京钢铁股份有限公司 | Low-steel-grade pipeline clean steel and smelting process therefor |
| CN109881095A (en) * | 2019-03-14 | 2019-06-14 | 南京钢铁股份有限公司 | A kind of B grades of acid-resistant pipeline steel plate and smelting process |
| CN110846565A (en) * | 2019-09-30 | 2020-02-28 | 邯郸钢铁集团有限责任公司 | Low-cost large-wall-thickness acid-resistant pipeline steel with stable structure and performance and production method thereof |
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Application publication date: 20130904 |