CN103740925B - Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling - Google Patents
Method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling Download PDFInfo
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Abstract
The invention discloses a method for linkage production of high-toughness pipeline steel by adopting jetting and laminar cooling, belonging to the technical field of production of medium-thickness plates. The super-cooled austenite continuous cooling transformation (CCT) curve of a steel plate is measured according to the chemical constituents of the steel plate. The steel plate comprises the following chemical ingredients in percentage by weight: 0.045-0.075 percent of C, 0.1-0.3 percent of Si, 1.55-1.85 percent of Mn, 0.045-0.085 percent of Nb, 0.1-0.2 percent of Mo, 0.1-0.3 percent of Ni, 0.01-0.02 percent of Ti and the balance of Fe and inevitable impurities. The method has the advantages that the problems of low toughness of pipeline steel plates of over grade X80 produced by jet cooling and low strength of pipeline steel plates of over grade X80 produced by laminar cooling are solved, and the high-toughness pipeline steel is produced.
Description
Technical field
The invention belongs to Heavy Plate Production technical field, particularly relate to a kind of method adopting injection and section cooling interlock to produce high-strong toughness pipe line steel.
Background technology
Generally be equipped with after current high-level plate mill and spray cooling apparatus and section cooling equipment, jet-type cooling apparatus cooling cold energy power is stronger, the steel plate speed of cooling of 20mm can reach 40 DEG C/s, and section cooling equipment can reach 20 DEG C/s for 20mm steel plate cooling rate.The first ultrafast cold cooling system (UFC) of the Qin and the western mark of section cooling design the representative that ACC acceleration cooling system is the cooling of current jet-type and laminar cooling system, UFC cooling apparatus possesses the feature that cooling power is strong, cooling uniformity is good, armor plate strength performance and steel plate template can be ensured preferably, ACC cooling apparatus cooling metal sheets cooling power is moderate, possesses the feature of steel plate thickness direction homogeneous microstructure, can ensure the toughness of steel plate preferably, these two kinds of cooling apparatuss are generally used by Domestic Plate enterprise all at present.High-strength line-pipe steel (more than X80 rank) to intensity and toughness reguirements all higher, to the west of three line X80 be example, steel plate yield strength standard 520MPa, tensile strength standard 625MPa,-20 degree ballistic work standard 220J,-15 spend standard 85 of dropping hammer, higher performance requriements requires strict to the process for cooling of steel plate, although can armor plate strength be ensured as used independent injection cooling mode, but ballistic work and block hammer performance lose larger, standard-required can not be met, although independent ACC laminar cooling system toughness is better, but the weak and cooling rear surface non-uniform temperature of cooling power, low strength and template situation is poor.
Summary of the invention
The object of the present invention is to provide a kind of method adopting injection and section cooling interlock to produce high-strong toughness pipe line steel, solve jet-type cooling and produce the problem that X80 rank above pipe line steel steel plate toughness is on the low side, section cooling production X80 rank above pipe line steel armor plate strength is on the low side, reach and produce high-strong toughness pipe line steel.
The present invention is by optimizing and combining UFC and ACC collector group number, devise the interlock cooling scheme of jet-type cooling and section cooling, and be applied to the production of 19 ~ 25mm high-strength line-pipe steel, reach the intensity and toughness of taking into account steel plate, improve the object of steel plate template simultaneously.
The present invention is based on first Qin ultra-rapid cooling system (Ultra fast cooling, and laminar cooling system (Accelerated control cooling UFC), ACC), UFC cooling system length 7m, have 9 groups of collectors, adopt jet-type cooling, its pressure of supply water reaches 0.5 ~ 0.8Mpa, long 24 meters of ACC laminar flow apparatus, amounts to 15 groups of collectors.After steel plate rolling completes, UFC cooling is entered with higher temperature, high temperature section adopts and ultrafastly coldly suppresses the ferritic Size growth of phase transition process, refinement proeutectoid ferrite, terminate UFC cooling when steel plate generating portion ferritic transformation and enter ACC system cools with certain temperature, remaining austenite has continued the transformation of ferrite and bainite under the effect of ACC, and when adopting ACC to cool, cooling rate is little, can avoid the formation of cold bainite structure.By adopting the cooling of UFC and ACC linked manner, steel plate tissue morphology can be mated, producing high-strong toughness steel plate.
Milling train, UFC, ACC equipment layout are as shown in Figure 1, steel plate enters UFC system cools after mill milling completes, then ACC system cools is entered, before UFC, between UFC and ACC, after ACC, all have pyrometer for detecting major temperature parameter in Cooling Process for Steel Plate Based, UFC and ACC cooling manifold will be arranged continuously.
The technical parameter step of technique and control is as follows:
According to chemical constituents determination steel plate supercooled austenite continuous cooling transformation curve (CCT curve) of steel plate, if Fig. 2 is certain specification X80 pipe line steel CCT curve, steel plate chemical composition is as follows:
C:0.045 ~ 0.075; Si:0.1 ~ 0.3; Mn:1.55 ~ 1.85; Nb:0.045 ~ 0.085; Mo:0.1 ~ 0.2; Ni:0.1 ~ 0.3; Ti:0.01 ~ 0.02, surplus is Fe and inevitable impurity.
1) steel plate ferritic transition temperature under different cooling speed is obtained by CCT curve interval, steel plate enters the temperature range 760 ~ 820 DEG C of UFC, under interlock cooling mode, usually require that 19 ~ 25mm steel plate is 20 ~ 40 DEG C/s in UFC cooling stages speed of cooling, as seen from the figure as the speed of cooling 20 DEG C/s of steel plate, X80 pipe line steel ferrite temperature transition interval is generally 550-700 DEG C, and the temperature range that known steel plate goes out UFC is 550-700 DEG C.
2) interval by the bainite temperature transition of the known steel plate of CCT curve, under interlock cooling mode, require that 19 ~ 25mm steel plate is at ACC cooling stages speed of cooling 10 ~ 20 DEG C/s, X80 pipe line steel bainite temperature transition is interval below 550 DEG C as seen from the figure, and working control requires final cooling temperature 400-550 DEG C.
3) according to the requirement design cooling code of steel plate at UFC cooling stages and ACC cooling stages cooling rate and final cooling temperature: at UFC cooling stages by design collector flow, roller table speed, collector group numerical control steel plate in the final cooling temperature in UFC stage and cooling rate, collector flow adjustment range 150 ~ 270m
3/ h, water than regulation range 1.0 ~ 2.0 roller table speed regulation range 0.5 ~ 1.5m/s, collector group number regulation range 5 ~ 9 groups; At ACC cooling stages by design collector flow, roller table speed, collector group numerical control steel plate in the final cooling temperature in ACC stage and cooling rate, collector flow adjustment range 200-500L/m
2* min, water than regulation range 1.2 ~ 3.0, roller table speed regulation range 0.5-1.5m/s, collector group number regulation range 1-5 group.
Current UFC+ACC links cooling mode can the above high-strength line-pipe steel of cladding thickness scope 19 ~ 25mmX80 rank, and mechanical property of steel plate is stablized, and template is good, significantly improves steel sheet product quality, improves CSAT and product competitiveness.
Accompanying drawing explanation
Fig. 1 is interlock cooling mode schematic diagram.Wherein, milling train 1, ultrafast cold cooling system (UFC) 2, laminar cooling system (ACC) 3, ultrafast cold entrance thermo detector 4, UFC outlet thermo detector 5, ACC export thermo detector 6, steel plate 7.
Fig. 2 is X80CCT curve (900 DEG C of austenitizings, deformation rate 30%)
Fig. 3 is steel plate CCT curve (19.1mm X80 pipe line steel)
Fig. 4 is steel plate CCT curve (25mm X80 pipe line steel), (900 DEG C of austenitizings, deformation rate 30%).
Embodiment
Example 1:19.1mm X80 pipe line steel
1) steel plate CCT curve (see figure 3)
Cooling rate in Fig. 3 is respectively 0.05,0.1,0.2,0.5,1,2,5,10,20 and 30 DEG C/s
2) according to CCT curve, when 30 DEG C/s, bainitic transformation starts temperature to cooling rate is 550 DEG C, determines that UFC cools final cooling temperature target 600 DEG C, cooling rate 30 DEG C/s, ACC stage final cooling temperature 450-500, cooling rate 18 DEG C/s.
Concrete technology parameter is as follows:
| Steel plate specification | Open cold temperature | The type of cooling | UFC cooling rate | UFC is cold eventually | ACC cooling rate | ACC is cold eventually |
| 19.1mm | 780 | UFC-ACC links cooling | 30℃/s | 600℃ | 18℃/s | 450-500 |
3) steel plate cooling code is designed as follows
Steel plate adopts 8 groups of UFC collector+4 group ACC collector coolings, and interlock cooling code setup parameter is as follows:
4) mechanical property of steel plate
Yield strength requires: 530 ~ 670MPa
Tensile strength requires: 625 ~ 825MPa
-15 DEG C of requirement: average > 85 that drop hammer
-20 DEG C are impacted requirement: average > 230J
Through mechanical properties test, 19.1mmX80 adopts the cooling of UFC+ACC linked manner, steel plate yield strength scope is at 550-600MPa, tensile strength scope is at 670-720MPa,-20 DEG C of ballistic work averages are at more than 350J,-15 DEG C of averages of dropping hammer reach 93, and armor plate strength and toughness are all good, meet industrialization production requirements.
Example 2:25mm X80 pipe line steel
1) steel plate CCT curve (see figure 4)
2) according to CCT curve, determine that UFC cools final cooling temperature target 600 DEG C, cooling rate 25 DEG C/s, ACC stage final cooling temperature 450-500, cooling rate 15 DEG C/s.
Processing parameter is as follows:
| Steel plate specification | Open cold temperature | The type of cooling | UFC cooling rate | UFC is cold ACC cooling rate eventually | ACC is cold eventually |
| 25mm | 780 | UFC+ACC links cooling | 25℃/s | 600℃15℃/s | 450-500 |
3) steel plate cooling code is designed as follows
Steel plate adopts 9 groups of UFC collector+4 group ACC collector coolings, and interlock cooling code setup parameter is as follows:
4) mechanical property of steel plate
Yield strength requires: 530 ~ 670MPa
Tensile strength requires: 625 ~ 825MPa
-51 DEG C of requirement: average > 40 that drop hammer
-51 DEG C are impacted requirement: average > 120J
Through mechanical properties test, 25mmX80 adopts the cooling of UFC+ACC linked manner, steel plate yield strength scope is at 530-590MPa, tensile strength scope is at 650-700MPa,-51 DEG C of ballistic work averages are at more than 280J,-15 DEG C of averages of dropping hammer reach more than 50, and steel plate template is all right, meets industrialization production requirements.
Found by large quantity research, for 19 ~ 25mm thickness specification steel plate, employing linked manner cools, and steel plate final cooling temperature hit rate is higher, and hit rate is within ± 20 DEG C, steel plate toughness and tenacity is all excellent simultaneously, yield strength affluence amount is at more than 30MPa, and tensile strength affluence amount is at more than 40Mpa, and steel plate ballistic work affluence amount is larger, template is all right simultaneously, can realize industrialized production.
Claims (1)
1. adopt injection and section cooling interlock to produce a method for high-strong toughness pipe line steel, described pipe line steel chemical composition is: C:0.045 ~ 0.075; Si:0.1 ~ 0.3; Mn:1.55 ~ 1.85; Nb:0.045 ~ 0.085; Mo:0.1 ~ 0.2; Ni:0.1 ~ 0.3; Ti:0.01 ~ 0.02, surplus is Fe and inevitable impurity; It is characterized in that, the technical parameter step of technique and control is as follows:
1) steel plate ferritic transition temperature under different cooling speed is obtained by CCT curve interval, steel plate enters the temperature range 760 ~ 820 DEG C of UFC, under interlock cooling mode, require that 19 ~ 25mm steel plate is 20 ~ 40 DEG C/s in UFC cooling stages speed of cooling, high-strong toughness X80 pipe line steel ferrite temperature transition interval is 550-700 DEG C, and the temperature range that steel plate goes out UFC is 550-700 DEG C;
2) interval by the bainite temperature transition of the known steel plate of CCT curve, under interlock cooling mode, require that 19 ~ 25mm steel plate is at ACC cooling stages speed of cooling 10 ~ 20 DEG C/s, high-strong toughness X80 pipe line steel bainite temperature transition is interval below 550 DEG C, and working control requires final cooling temperature 400-550 DEG C;
3) at UFC cooling stages by design collector flow, roller table speed, collector group numerical control steel plate in the final cooling temperature in UFC stage and cooling rate, collector flow adjustment range 150 ~ 270m
3/ h, water than regulation range 1.0 ~ 2.0 roller table speed regulation range 0.5 ~ 1.5m/s, collector group number regulation range 5 ~ 9 groups; At ACC cooling stages by design collector flow, roller table speed, collector group numerical control steel plate in the final cooling temperature in ACC stage and cooling rate, collector flow adjustment range 200-500L/ ㎡ * min, water is than regulation range 1.2 ~ 3.0, roller table speed regulation range 0.5-1.5m/s, collector group number regulation range 1-5 group.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107099743B (en) * | 2017-04-01 | 2021-06-18 | 江阴兴澄特种钢铁有限公司 | Ultra-thick high-toughness X100 ultra-high steel grade pipeline steel plate and preparation method thereof |
| CN107099745B (en) * | 2017-04-01 | 2019-12-27 | 江阴兴澄特种钢铁有限公司 | High-carbon-equivalent low-temperature high-toughness pipeline steel plate for X80 elbow and manufacturing method thereof |
| CN108546885B (en) * | 2018-07-03 | 2019-09-20 | 鞍钢股份有限公司 | A kind of the L555M pipe line steel and its manufacturing method of excellent in low temperature toughness |
| CN108950388A (en) * | 2018-07-03 | 2018-12-07 | 鞍钢股份有限公司 | A kind of the L485M pipe line steel and its manufacturing method of excellent in low temperature toughness |
| CN112143968A (en) * | 2020-08-30 | 2020-12-29 | 五矿营口中板有限责任公司 | Ultra-thick X70M-grade double-resistance pipeline steel plate and manufacturing method thereof |
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| CN1715434A (en) * | 2004-06-30 | 2006-01-04 | 宝山钢铁股份有限公司 | Method for producing high strength high toughness x80 pipeline steel and its hot-rolled plate |
| EP2036995A1 (en) * | 2006-07-04 | 2009-03-18 | Nippon Steel Corporation | High-strength steel pipe with excellent low-temperature toughness for line pipe, high-strength steel plate for line pipe, and processes for producing these |
| CN102343372A (en) * | 2011-10-20 | 2012-02-08 | 秦皇岛首秦金属材料有限公司 | Production method for rapidly cooling medium plate after rolling |
| CN103014491A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1715434A (en) * | 2004-06-30 | 2006-01-04 | 宝山钢铁股份有限公司 | Method for producing high strength high toughness x80 pipeline steel and its hot-rolled plate |
| EP2036995A1 (en) * | 2006-07-04 | 2009-03-18 | Nippon Steel Corporation | High-strength steel pipe with excellent low-temperature toughness for line pipe, high-strength steel plate for line pipe, and processes for producing these |
| CN102343372A (en) * | 2011-10-20 | 2012-02-08 | 秦皇岛首秦金属材料有限公司 | Production method for rapidly cooling medium plate after rolling |
| CN103014491A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof |
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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee after: Shougang Group Co. Ltd. Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Capital Iron & Steel General Company Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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Effective date of registration: 20190529 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Shougang Group Co. Ltd. Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |