CN101161847B - High-ductility steel for hot-bending bends and production method for hot rolled plates thereof - Google Patents

High-ductility steel for hot-bending bends and production method for hot rolled plates thereof Download PDF

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CN101161847B
CN101161847B CN2006100480220A CN200610048022A CN101161847B CN 101161847 B CN101161847 B CN 101161847B CN 2006100480220 A CN2006100480220 A CN 2006100480220A CN 200610048022 A CN200610048022 A CN 200610048022A CN 101161847 B CN101161847 B CN 101161847B
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steel
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CN101161847A (en
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任毅
张禄林
郝森
丛津功
张帅
隋轶
王爽
王丽慧
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Angang Steel Co Ltd
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Abstract

The invention provides a high toughness steel for hot bending bent steel and a production method of hot rolling flat plate thereof. The chemical compositions of the steel (weight percentage) comprise: C of 0.04 percent to 0.12 percent, Si of 10 percent to 0.30 percent, Mn of 1.50 percent to 1.65 percent, Nb of 0.04 percent to 0.08 percent, Ti of 0.008 percent to 0.025 percent, Ni of 0.15 percent to 0.36 percent, Mo of 0.15 percent to 0.30 percent, remaining iron and unavoidable impurities. The production method of the hot rolling flat plate comprises smelting, refining outside the hearth and continuous casting. Steel rolling is adopted a controlled rolling controlled cooling technics. The heating temperature of plate blank is ranged from 1160 DEG C to 1220 DEG C. Rough rolling temperatureis ranged from 1010 DEG C to 1150 DEG C. Precision rolling temperature is ranged from 800 DEG C to 950 DEG C. Controlled cooling speed after rolled is ranged from 15 DEG C /s to 30 DEG C /s. Terminalcooling temperature is ranged from 450 DEG C to 600 DEG C. The invention has reasonable ingredient design. The production cost of the invention can be reduced about 15 percent compared to the prior art. The hot rolling steel plate of the invention can get composite organization with bainite as main part and has good low temperature toughness. The ballistic power is larger than 220 J in 20 DEG C below zero and the shearing area of DWTT at 15 DEG C below zero reaches up to 90 percent. The yield strength of the product reaches up to 520MPa and the tension resistance reaches up to 570MPa. The hotrolling steel toughness of the invention is not reduced after treatment and has better obdurability.

Description

The production method of high-ductility steel for hot-bending bends and hot rolled slab thereof
Technical field
The invention belongs to the field of low-carbon micro steel-alloy, relate in particular to the production method of making high pressure, heavy caliber petroleum natural-gas transfer pipeline hot-bending bends steel and hot rolled slab thereof.
Background technology
Bend pipe is one of pipe fitting product important on the pipeline, effect it mainly plays two on pipeline aspect, and the one, change the direction of pipeline as required; Another is the theory of structures effect---stratum migration that can region, buffer pipeline place, earthquake and ambient temperature variation etc. are attached to drawing on the straight tube, stress and torsional interaction.Bend pipe is to carry one of comparatively harsh structural part in the pipeline, in the pipeline that builds up operation, the pipeline accident relevant with bend pipe occupied quite high ratio in whole pipeline accident, this shows, the overall quality of bend pipe just is one of bottleneck of restriction pipeline safety smooth running.
GB/T12459-1990, SY/T5257-91 are adopted in China's bend pipe manufacturing.The X70 level bend pipe of producing normally adopts X70 level pipeline steel tube to do female pipe now, makes after fire bending processing, because female pipe is the design of controlled rolling steel, after heat treatment, its intensity and toughness reduce significantly.In addition, because carbon content is lower, other alloying element is more, and its production cost is relatively also higher.
Japanese Patent JP2002129288 discloses a kind of high strength bend pipe and production method thereof, APIX80~100 ladles contain: C≤0.03%, Si≤0.3%, Mn:0.8%~2.5%, P≤0.015%, S≤0.005%, Nb:0.01~0.05%, Ti:0.005~0.030%, Al≤0.05%, N:0.001~0.06%, and other any metal Ni:0.01~1.0%, Cu:0.1~1.2%, Cr:0.1~1.0%, V:0.01~0.10%, Ca:0.001~0.005%, Mg:0.0001~0.002%, all the other are iron.The raw material steel pipe is 800~1000 ℃ of hot rollings, and bending is quenched then, obtains final bend pipe product.This patented technology is because carbon content is lower, and other alloying element is more, and production cost is higher, and does not comprise X70 level bend pipe.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the method that a kind of X70 and X80 grade high ductility steel for hot-bending bends is provided and produces this hot rolled slab.By adjusting the chemical ingredients of female pipe, make it to be fit to heat treated needs, when reducing cost, obtain reinforcement, malleableize effect preferably.
The chemical ingredients of high-ductility steel for hot-bending bends of the present invention is (weight percent) C:0.04%~0.12%, Si:0.10%~0.30%, Mn:1.50%~1.65%, Nb:0.04%~0.08%, Ti:0.008%~0.025%, Ni:0.15%~0.36%, Mo:0.15%~0.45%, Cu:0.15%~0.30%, and surplus is iron and unavoidable impurities.
The hot rolled slab production method of high-ductility steel for hot-bending bends of the present invention comprises smelting, external refining, continuous casting, cooling controlling and rolling controlling process is adopted in steel rolling, the Heating temperature that it is characterized in that slab is 1160~1220 ℃, the roughing temperature range is 1010~1150 ℃, the final rolling temperature interval is 800~950 ℃, rolling back controlled chilling speed is 15~30 ℃/s, and the final cooling temperature interval is 450~600 ℃, afterwards air cooling.
The composition design reason of high-ductility steel for hot-bending bends of the present invention:
Carbon: along with carbon content increases, the intensity of steel increases, and toughness, welding property reduce.But owing to reaching its maturity of cooling controlling and rolling controlling process and micro-alloying technology, simultaneously for improving the performance of welded heat affecting zone (HAZ), carbon content in the steel reduces gradually, and the carbon content of X70 of the present invention, X80 level pipeline hot-bending bends steel should be advisable 0.04%~0.12%.
Manganese: the solution strengthening effect is arranged, also can reduce γ-α transformation temperature, and then the refinement ferrite crystal grain, can improve the intensity and the toughness of steel simultaneously, but increase Mn content crystal grain thinning, but if surpass 1.65%, center segregation then occurs, castability and impelling strength are had a negative impact; If be lower than 1.50%, then do not reach the purpose that improves intensity.
Silicon: be the element of stablizing ferritic structure, can also suppress the formation of carbide, this element plays an important role in TRIP steel and DP steel, but really not so for the API steel.In the API steel,, can have a negative impact to changing performance and toughness because of forming perlite if improve Si content.So the present invention is limited to 0.10%~0.30% with the component content of Si.
Niobium: can postpone austenite recrystallization, reduce transformation temperature, the performance that obtains to require by mechanism such as solution strengthening, phase transformation strengthening, precipitation strengths.0.04%~0.08%Nb steel cooperates rational rolling technology, can obtain uniform compound phase and excellent toughness based on bainite structure.
Titanium: after adding trace Ti, the embrittlement temperature district disappears.This is because in the austenite high-temperature zone, and (so N is fixed on the austenite high-temperature zone by TiN, (N C) has become at austenite cold zone and NbC that γ+the α two-phase region is difficult to separate out the Nb precipitate TiN from Nb for N, C) easier generation than Nb.
Molybdenum: can reduce the formation of transformation temperature, inhibition granular ferrite, the transformation of promotion acicular ferrite, and can improve the precipitation strength effect of Nb (C, N), the pipe line steel of this alloy system has the tiny bainite structure that contains highly dense dislocation, intensity height (reaching 520MPa), impelling strength is good.In X70 pipeline steel for hot-bending bends, Mo content is more satisfactory 0.15%~0.45%.
Copper, nickel: can improve the intensity of steel by the solution strengthening effect, Cu also can improve the solidity to corrosion of steel simultaneously, and the adding of Ni mainly is to improve the red brittleness that Cu easily causes in steel, and useful to toughness.Also can compensate the strength degradation that the increase because of thickness causes in the curved tube steel of thick specification, copper content of the present invention elects 0.15%~0.30% as, and nickel content elects 0.15%~0.36% as.
The present invention is controlled at P≤0.020% with the impurity element in the steel, and S≤0.003% is producing under the possible situation, low more good more.
The hot rolled slab production method of high-ductility steel for hot-bending bends of the present invention is made up of following steps:
Get the raw materials ready by the technical scheme proportioning ... molten iron pre-desulfurization ... the LD converter smelting ... external refining ... continuous casting ... the slab reheat ... controlled rolling ... controlled chilling ... aligning ... scale ... flaw detection ... finishing ... check ... warehouse-in.
Hot rolling technology design of the present invention:
Slab heating temperature: slab heating main purpose is that alloying element solid solution and austenite are evenly prepared for the rolling deformation of back, and Heating temperature is too high, easily causes growing up of austenite crystal, can have influence on the toughness of steel; Heating temperature is low excessively, and fully solid solution of alloying element does not reach the effect of alloy strengthening.Therefore the Heating temperature of selecting is 1160~1220 ℃.
The roughing temperature: rough rolling step is the recrystallize rolling sequence, is to allow the abundant refinement of austenite more than recrystallization temperature, and recrystallize takes place, if temperature is low excessively, easily causes mixed crystal, and the present invention is made as 1010~1150 ℃ with the roughing temperature range.
Final rolling temperature: the finish rolling stage is a non-recrystallization district rolling sequence, and austenite elongates, flattens along rolling direction, and intracrystalline produces deformation bands, and the austenite of this work hardening easily promotes ferritic forming core.Mixed crystal easily takes place in the temperature height, and temperature is low, enters two-phase region, has to analyse the ferrite appearance earlier, and is unfavorable to obdurability, so the final rolling temperature interval is made as 800~950 ℃.Thisly widely reach that 150 ℃ final rolling temperature is interval to be finished the dislocation accumulation in finish rolling interval and grain refining task subsequently for the line steel hot rolling flat plate of uni-tension rolling and created possiblely, also be suitable for the bigger characteristics of temperature drop during the line steel hot rolling flat plate finish rolling.
Cooling control after rolling speed: will roll back controlled chilling speed and be made as 15~30 ℃/s, and can obtain complex tissue, and have good low-temperature flexibility based on bainite.
Final cooling temperature: final cooling temperature is the interval of control structural transformation product, and the temperature height is prone to perlite, causes undercapacity, and the quantity of the low MA phase of temperature increases, and causes toughness to descend, and is 450~600 ℃ with the final cooling temperature interval selection therefore.
The composition of high-ductility steel for hot-bending bends of the present invention is reasonable in design, and compared with prior art, its production cost can reduce about 15%; The hot-rolled steel sheet that adopts the inventive method to produce can obtain the complex tissue based on bainite, has good low-temperature flexibility, its-20 ℃ of ballistic works are greater than 220J, the shear area of-15 ℃ of DWTT reaches more than 90%, the product yield strength can reach the above design requirements of 520MPa, and anti-opening can reach the above design requirements of 570MPa; Complex tissue steel plate of the present invention is handled (900~1000 ℃ of heating, 500~560 ℃ of tempering) back toughness through hot bending and is not reduced, and has better strength and toughness.
Description of drawings
Accompanying drawing 1 and accompanying drawing 2 are respectively the metallographic structure of high-ductility steel for hot-bending bends X70 of the present invention and X80.
Embodiment
The chemical ingredients of 6 embodiment of high-ductility steel for hot-bending bends of the present invention sees Table 1, and the rolling technology of corresponding embodiment sees Table 2, and its service check the results are shown in Table 3, and the performance after the fire bending sees Table 4.
The chemical ingredients of table 1 high-ductility steel for hot-bending bends of the present invention
Figure S06148022020061106D000051
The rolling technology of table 2 high-ductility steel for hot-bending bends of the present invention
Sequence number Heating temperature, ℃ The roughing temperature range, ℃ The final rolling temperature interval, ℃ Cooling rate, ℃/s Final cooling temperature, ℃
1 1194 1100-1010 950-802 21 580
2 1220 1148-1030 950-805 18 594
3 1220 1150-1050 930-800 15 600
4 1160 1130-1010 950-820 26 450
5 1163 1109-1012 950-813 30 467
6 1200 1130-1010 950-820 20 500
The performance of table 3 high-ductility steel for hot-bending bends of the present invention
Figure S06148022020061106D000061
Performance after the table 4 high-ductility steel for hot-bending bends fire bending of the present invention
Figure S06148022020061106D000062

Claims (2)

1. high-ductility steel for hot-bending bends, the chemical ingredients that it is characterized in that this steel is counted C:0.04%~0.12%, Si:0.10%~0.30%, Mn:1.50%~1.65%, Nb:0.04%~0.08%, Ti:0.008%~0.025%, Ni:0.15%~0.36%, Mo:0.15%~0.45%, Cu:0.15%~0.30% according to weight percent, and surplus is iron and unavoidable impurities.
2. the hot rolled slab production method of the described high-ductility steel for hot-bending bends of claim 1, comprise smelting, external refining, continuous casting, cooling controlling and rolling controlling process is adopted in steel rolling, the Heating temperature that it is characterized in that slab is 1160~1220 ℃, the roughing temperature range is 1010~1150 ℃, and the final rolling temperature interval is 800~950 ℃, and rolling back controlled chilling speed is 15~30 ℃/s, the final cooling temperature interval is 450~600 ℃, afterwards air cooling.
CN2006100480220A 2006-10-13 2006-10-13 High-ductility steel for hot-bending bends and production method for hot rolled plates thereof Expired - Fee Related CN101161847B (en)

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CN102039515B (en) * 2009-10-22 2012-11-07 中山市毅马五金有限公司 Machining process of hot bent end plate
CN101880818B (en) * 2010-06-04 2012-05-30 中国石油天然气集团公司 Preparation method of X80 bent pipe and pipe fittings
CN102312164B (en) * 2010-06-29 2013-12-11 鞍钢股份有限公司 Steel for Cr-contained high-performance pipe fittings for oil and gas transmission and production method thereof
CN102400040B (en) * 2010-09-07 2014-03-12 鞍钢股份有限公司 Production method of low-carbon bainite steel hot-rolled strip used in low-temperature
CN102161148B (en) * 2011-02-22 2014-06-04 中国石油天然气集团公司 Method for preparing X90 steel-grade bent pipes and pipe fittings
CN102127698A (en) * 2011-02-22 2011-07-20 中国石油天然气集团公司 Production method of X100 steel grade elbow pipes and pipe fittings
CN102337476B (en) * 2011-10-25 2013-07-24 华洪萍 Novel heat-resistant steel
CN103088270A (en) * 2011-11-03 2013-05-08 中国石油天然气集团公司 Manufacturing method of X70 large-deformation steel fire-bent pipe
CN102851586B (en) * 2012-07-11 2014-06-18 武汉钢铁(集团)公司 Engineering steel with drop hammer fracture fiber rate being more than 95% and production method thereof
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CN103981460A (en) * 2014-05-30 2014-08-13 秦皇岛首秦金属材料有限公司 Hot rolling flat steel for high toughness X80 elbow and production method thereof
CN107099744A (en) * 2017-04-01 2017-08-29 江阴兴澄特种钢铁有限公司 The X80 bend pipes Pipeline Steel Plate and its manufacture method of a kind of hic resistance
CN108085593A (en) * 2017-12-19 2018-05-29 钢铁研究总院 Suitable for low temperature environment oil-gas transportation bend pipe and steel for pipe fittings and manufacturing method
CN108754325A (en) * 2018-06-14 2018-11-06 鞍钢股份有限公司 560MPa grades of Cu timeliness steel for hot-bending bends plates and production method
CN112063925A (en) * 2020-09-08 2020-12-11 鞍钢股份有限公司 600 MPa-level pipeline structural steel with excellent hot-working performance and production method thereof

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