CN101921955B - Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling - Google Patents
Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling Download PDFInfo
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- CN101921955B CN101921955B CN2010102359256A CN201010235925A CN101921955B CN 101921955 B CN101921955 B CN 101921955B CN 2010102359256 A CN2010102359256 A CN 2010102359256A CN 201010235925 A CN201010235925 A CN 201010235925A CN 101921955 B CN101921955 B CN 101921955B
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Abstract
The invention relates to a pipeline steel and a manufacturing method thereof, in particular to a method for manufacturing a pipeline steel medium plate with an excellent tenacity through normalizing rolling. The method comprises the steps of: heating a bloom steel for 3 to 6 hours under low temperature from 1120 to 1220 DEG C, hot rolling the bloom steel after being discharged and naturally cooling the rolled bloom steel to the room temperature, wherein the hot rolling is divided into two stages and holding delay is operated between the two stages; the first stage of longitudinal rolling ensures a single-path depressing ratio more than 15%; the holding delay thickness of a semi-finished product is less than or equal to two times of the thickness of the finished products; and the temperature for ending the rolling in the second stage is Ac3 plus (30 to 80) DEG C. The method has the advantages that the production process is simple, the steel plate has excellent low-temperature tenacity, an impact power of a -60 DEG C V-type gap is stabled over 300J and a -60 DEG C drop hammer property is stabled over 85%.
Description
Technical field
The invention belongs to the Heavy Plate Production technical field, particularly relate to the method that a kind of normalizing rolling is produced good-toughness pipe line steel plate.This steel plate adopts the normalizing rolling explained hereafter, has good low temperature block hammer performance.
Background technology
Pipe line steel was obtained great development in nearly 50 years as a kind of economy of oil, Sweet natural gas, safely, uninterruptedly long distances instrument, followed the raising of energy demand especially, and pipe line steel rank and requirement improve constantly.And for subsea pipeline, transfer pressure is not a sixty-four dollar question, and therefore, it is how high that a design criteria of subsea pipeline steel does not lie in rank, and lay particular emphasis on the fracture toughness property and the crush resistance quality of steel pipe.
Seabed transport pipe engineering adopts the pipe line steel plate of good-toughness more, such as the submerged pipeline project of Japan, Hong Kong submerged pipeline project etc., all adopts other pipe line steel of 15-25mm specification X60/X52 level.Owing to be that submerged pipeline use steel plate, its performance requriements is higher, is fracture toughness property and the performance uniformity that guarantees product, and the composition of this rank steel grade is designed and production technique has all proposed higher requirement.
The normalizing rolling that the present invention relates to is produced the pipe line steel plate of good-toughness, has both satisfied the strength property of steel plate, has the good toughness of dropping hammer again concurrently, and production technique is brief simultaneously, meets " low-carbon economy " theory.From the patented technology of current pipeline steel application and the document of delivering, aspect such as the production technique with excellent in toughness pipe line steel plate and composition design and this patent have essential difference.
Summary of the invention
The object of the present invention is to provide a kind of normalizing rolling to produce the method for good-toughness pipe line steel plate, its production technique is a normalizing rolling technology.
Said steel plate chemical ingredients of the present invention is: C:0.06～0.15%, Si:0.10～0.45%, Mn:1.05～1.75%; P :≤0.02%, S :≤0.01%, Alt:0.01～0.06%; V:0.02～0.10%, Nb:0.01～0.05%, Ti:0.01～0.04%; N :≤0.012%, surplus is Fe and inevitable impurity element; Be weight percentage.
Adopt above-mentioned chemical ingredients steel billet, through normalizing rolling technology, the present invention has prepared that-60 ℃ of v-notch Charpy-V impact powers are stable to be reached more than the 300J, and-60 ℃ of block hammer performances are stable to reach the good-toughness pipe line steel plate more than 85%.Its production technique is specific as follows:
(1) low-temperature heat: steel billet is heated to 1120-1220 ℃, 3-6 hour heat-up time.
(2) normalizing rolling technology: steel billet is rolled in two stages; Temperature is treated in the centre; Fs axial rolling process bonding percentage pass reduction is greater than 15%, and intermediate blank is treated 2 times of temperature thickness≤finished product thickness, and it is Ac3+ (30～80) ℃ that subordinate phase stops rolling temperature.
The mode of (3) rolling naturally cooling in the back employing air is to room temperature.
The formation main points of content of the present invention are based on following understanding: C and are improved intensity through solution strengthening and precipitation strength, but unfavorable to ductility, low-temperature flexibility and welding property; Nb improves the recrystallization temperature of material, enlarges the non-recrystallization district, and is fairly obvious to the effect of grain refining, improves the intensity and the low-temperature flexibility of material; V can effectively improve the intensity of steel plate through the precipitation strength effect; A certain amount of N element is for separating out of Nb and V creates conditions.
Adopt the foundation of this production technique to be:, to guarantee the abundant dissolving of second phase, and effectively suppress original austenite grains and grow up through the control slab heating temperature; Strengthen controlled rolling simultaneously, make distortion fully be penetrated into heart portion, make abundant refinement of austenite crystal and homogenizing; And guarantee that stopping rolling temperature is Ac3+ (30～80) ℃; Finally, obtain the uniform phase-change organization of refinement, improve the intensity and the low-temperature flexibility of steel plate through naturally cooling in the air.
The invention has the advantages that: the pipe line steel plate of the good-toughness of the present invention's preparation has adopted unique design of alloy and production process system.The carbon content that on alloying constituent, adopts is 0.06-0.15%; Can either guarantee the low-temperature flexibility of material; Can obviously improve the strength property of normalized steel plate again; Adopt suitable Nb and V microalloying in addition, make full use of precipitation strength mechanism in process of production, can satisfy the higher intensity and the toughness reguirements of lesser temps.On production process system, adopt normalizing rolling technology; Low-temperature heat and low temperature are depressed the refinement original austenite grains greatly, stop rolling temperature and are controlled at Ac3+ (30～80) ℃, then through naturally cooling in the air; Obtain the uniform phase-change organization of refinement, have extraordinary obdurability collocation.The good-toughness pipe line steel plate performance of producing according to the described technical scheme of this patent reaches following level:
(1) tensile property: ys reaches 410-490MPa, and tensile strength reaches 510-580MPa, and yield tensile ratio is in the 0.73-0.85 scope.
(2) low-temperature flexibility: 10 * 10 * 55mm sample summer of-40 ℃, more than 400J ,-60 ℃ Charpy-V impact power was more than 300J than v-notch ballistic work.Block hammer performance (DWTT) average shear area >=85% of-40 ℃ block hammer performance (DWTT) average shear area >=90% ,-60 ℃.
(3) cold-bending property: horizontal clod wash d=2a (d is a bending diameter, and a is a steel plate thickness), 180 ° of stretching faces are intact.
Embodiment
A kind of normalizing rolling is produced the method for good-toughness pipe line steel plate according to the present invention, in 100 tons of converters, smelt, and continuous casting becomes the continuously cast bloom of 250mm * 2000mm * 3150mm, on the 4300mm production line, carries out normalizing rolling production.The following example light plate chemical ingredients is the chemical ingredients that the present invention designs, and its normalizing rolling process system and steel plate mechanical property are as follows respectively:
● the normalizing rolling process system
Embodiment 1
Slab heating temperature: 1180 ℃, 4 hours heat-up times; Fs axial rolling process single pass deformation rate is at 17-28%; Intermediate blank treats that temperature thickness is 1.5 times of Finished Steel plate thickness; It is 890 ℃ that the subordinate phase steel plate stops rolling temperature; Roll in the air of back and naturally cool to room temperature.The steel plate comprehensive mechanical property sees the following form shown in 1.
Embodiment 2
Slab heating temperature: 1160 ℃, 5 hours heat-up times; Fs axial rolling process single pass deformation rate is at 15-25%; Intermediate blank treats that temperature thickness is 2 times of Finished Steel plate thickness; It is 880 ℃ that the subordinate phase steel plate stops rolling temperature; Roll in the air of back and naturally cool to room temperature.The steel plate comprehensive mechanical property sees the following form shown in 1.
Embodiment 3
Slab heating temperature: 1200 ℃, 4 hours heat-up times; Fs axial rolling process single pass deformation rate is at 16-29%; Intermediate blank treats that temperature thickness is 1.5 times of Finished Steel plate thickness; It is 910 ℃ that the subordinate phase steel plate stops rolling temperature; Roll in the air of back and naturally cool to room temperature.The steel plate comprehensive mechanical property sees the following form shown in 1.
Embodiment 4
Slab heating temperature: 1220 ℃, 3.5 hours heat-up times; Fs axial rolling process single pass deformation rate is at 18-31%; Intermediate blank treats that temperature thickness is 2 times of Finished Steel plate thickness; It is 920 ℃ that the subordinate phase steel plate stops rolling temperature; Roll in the air of back and naturally cool to room temperature.The steel plate comprehensive mechanical property sees the following form shown in 1.
● the steel plate mechanical property
The metallographic structure of normalizing rolling good-toughness pipe line steel plate of the present invention is even tiny ferritic+dispersion point globular pearlite tissue morphology, with reference to accompanying drawing.The steel plate mechanical property is as shown in table 1 below.
Table 1 steel plate mechanical property
Claims (1)
1. a normalizing rolling is produced the method for good-toughness pipe line steel plate, and said steel plate chemical ingredients is: C:0.06～0.15%, Si:0.10～0.45%, Mn:1.05～1.75%; P :≤0.02%, S :≤0.01%, Alt:0.01～0.06%, V:0.02～0.10%; Nb:0.01～0.05%, Ti:0.01～0.04%, N :≤0.012%; Be weight percentage, it is characterized in that, the steel plate production technique is following:
(1) low-temperature heat: steel billet is heated to 1120-1220 ℃, is incubated 3-6 hour;
(2) normalizing rolling technology: steel billet is rolled in two stages; Temperature is treated in the centre; Fs axial rolling process bonding percentage pass reduction is greater than 15%, and intermediate blank is treated 2 times of temperature thickness≤finished product thickness, and it is Ac3+ (30～80) ℃ that subordinate phase stops rolling temperature;
The mode of (3) rolling naturally cooling in the back employing air is to room temperature.
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| CN2010102359256A CN101921955B (en) | 2010-07-22 | 2010-07-22 | Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling |
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| CN2010102359256A CN101921955B (en) | 2010-07-22 | 2010-07-22 | Method for manufacturing pipeline steel medium plate with excellent tenacity through normalizing rolling |
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| CN101921955B true CN101921955B (en) | 2012-05-30 |
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| CN102416406B (en) * | 2011-09-21 | 2014-04-02 | 首钢总公司 | Method for improving edge and core structure uniformity of large wall thickness pipeline steel |
| CN102392185B (en) * | 2011-10-28 | 2013-05-22 | 首钢总公司 | Normalized acid resistant hot-rolled steel plate and preparation method thereof |
| CN103525998B (en) * | 2013-09-29 | 2015-11-04 | 莱芜钢铁集团有限公司 | Normalizing rolling type close grain pressure welding steel pipe Wide and Heavy Plates |
| CN103725960B (en) * | 2013-12-28 | 2016-01-20 | 首钢总公司 | A kind of Thin high-flexibility pipeline steel plate and production method thereof |
| CN103757549A (en) * | 2014-01-08 | 2014-04-30 | 鞍钢股份有限公司 | 355MPa-class thick plate and production method thereof |
| CN103757548A (en) * | 2014-01-09 | 2014-04-30 | 鞍钢股份有限公司 | Low-aging sensitivity hot rolled plate with high strength and toughness and manufacturing method thereof |
| CN107363094B (en) * | 2016-05-12 | 2019-02-26 | 鞍钢股份有限公司 | A kind of thin gauge pipe line steel milling method |
| CN108220793B (en) * | 2016-12-13 | 2019-08-27 | 鞍钢股份有限公司 | A kind of micro alloyed steel slab and its normalizing rolling method |
| CN109207838A (en) * | 2017-06-29 | 2019-01-15 | 宝山钢铁股份有限公司 | A kind of heat treatment type pipe line steel and its manufacturing method |
| CN110184529A (en) * | 2018-07-14 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | A kind of middle low-temperature pressure container end socket carbon steel plate and its manufacturing method |
| CN111187988B (en) * | 2020-02-28 | 2021-07-06 | 鞍钢股份有限公司 | Low-cost high-strength and high-toughness pressure vessel steel plate and production method thereof |
| CN111455255B (en) * | 2020-03-30 | 2022-05-06 | 江阴兴澄特种钢铁有限公司 | Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm |
| CN111254362B (en) * | 2020-03-31 | 2021-01-19 | 湖南华菱湘潭钢铁有限公司 | Production method of Gr.B-grade normalizing pipeline steel |
| CN113145640A (en) * | 2021-04-27 | 2021-07-23 | 南京钢铁股份有限公司 | Method for controlling steel plate iron scale through low-temperature heating and normalizing rolling of steckel mill |
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| JPS61127814A (en) * | 1984-11-24 | 1986-06-16 | Sumitomo Metal Ind Ltd | Manufacture of high tension steel plate having excellent low-temperature toughness |
| CN101456034B (en) * | 2009-01-06 | 2011-02-16 | 北京科技大学 | Production method of heavy plate of X80 level large-deformation resistance pipe line steel |
| CN101768703B (en) * | 2010-01-26 | 2011-09-21 | 东北大学 | Grade X80 pipe line steel with low yield ratio and manufacturing method thereof |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |