CN102400039A - Slurry feed line steel with good low-temperature toughness and manufacturing method thereof - Google Patents

Slurry feed line steel with good low-temperature toughness and manufacturing method thereof Download PDF

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Publication number
CN102400039A
CN102400039A CN2010102764276A CN201010276427A CN102400039A CN 102400039 A CN102400039 A CN 102400039A CN 2010102764276 A CN2010102764276 A CN 2010102764276A CN 201010276427 A CN201010276427 A CN 201010276427A CN 102400039 A CN102400039 A CN 102400039A
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steel
temperature
good low
rolling
controlled rolling
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徐烽
黄国建
张禄林
乔磊
王杰
杨静
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The invention provides slurry feed line steel with good low-temperature toughness and a manufacturing method thereof. The slurry feed line steel with good low-temperature toughness comprises 0.10 to 0.20% of C, 0.10 to 0.30% of Si, 0.80 to 1.50% of Mn, less than or equal to 0.018% of P, less than or equal to 0.004% of S, 0.010 to 0.035% of Ti, 0.02 to 0.05% of Als, less than or equal to 0.006% of N and the balance Fe. The manufacturing method of the slurry feed line steel with good low-temperature toughness comprises smelting, continuous casting and hot rolling. When a plate blank is heated to a temperature of 1160 to 1300 DEG C, the plate blank is subjected to a first-stage controlled rolling and a second-stage controlled rolling, wherein an initial temperature of the first-stage controlled rolling is in a range of 1130 to 1200 DEG C; an end temperature of the first-stage controlled rolling is above 1020 DEG C; an initial temperature of the second-stage controlled rolling is below 1000 DEG C; and an end temperature of the second-stage controlled rolling is in a range of 780 to 880 DEG C. The plate blank subjected to the first-stage controlled rolling and the second-stage controlled rolling is cooled at a speed of 5 to 20 DEG C per second and then is reeled at a temperature of 550 to 680 DEG C. The manufacturing method of the slurry feed line steel with good low-temperature toughness has the advantages that the slurry feed line steel with good low-temperature toughness does not contain precious alloy elements such as Nb, Mo, V and the like so that an alloy cost is low; S content and P content are controlled strictly so that good low-temperature toughness of steel is guaranteed effectively; and a controlled rolling and controlled cooling technology is utilized for crystal particle refinement so that a pearlite microstructure is uniformly distributed and good steel strength matching with toughness is guaranteed.

Description

Slurry line of pipes with good low-temperature toughness is with steel and method of manufacture thereof
Technical field
The invention belongs to technical field of ferrous metallurgy, relate in particular to slurry line of pipes that a kind of hot rolling state property can reach B-X60 grade of steel in the APISpec 5L standard with steel and method of manufacture thereof.
Background technology
Pipe-line transportation is most economical, safe, efficient and environmental transportation method such as long distances oil, Sweet natural gas, coal slurry; Along with the technology of utilizing pipe-line transportation coal slurry and various ore pulps fully matured; Before expecting 2010; China will build up the coal slurry pipeline of the about 5000-6000km of total length, and many ore slurry pipelines also maybe will be built.
Slurry is carried and is satisfied ANS ASME B31.11-2002 and the API SPEC 5L of API standard with pipeline steel; Its conveying is divided into vertical masonry joint electricresistance welded steel pipe (ERW) with steel pipe by the tubulation mode with pipework; Spiral submerged arc welded steel pipe (SSAW or SAWH); Longitudinal submerged arc welded pipe (LSAW or SAWL), wherein preceding 2 kinds of raw materials that welded tube adopted are hot-rolled coil, back a kind of raw material that adopts is a hot-rolled steel sheet.
For satisfying the related request that slurry is carried; Except obdurability coupling and weldability that conventional line of pipes steel requires; Also should have certain wear resistance, use at cold district for guaranteeing simultaneously, also should possess good low-temperature performance simultaneously; Therefore the slurry line of pipes must reduce harmful element content such as P, S with steel, guarantees the homogeneity of tissue simultaneously through appropriate ingredients design and production technique.
Before the present invention, existing a plurality of relevant slurries are carried the patent of invention with pipe line steel, and the patent of invention comparatively approaching with the present invention has:
Patent 1 (publication number CN 1236020), table 1 is seen in its composition design.
The design of table 1 patent 1 composition (wt, %)
Its technology is 1250 ℃ of steel billet soaking temperatures, 850 ℃ of hot rolling finishing temperatures, 540 ± 20 ℃ of the temperature of curling.
In the composition design of this patent, be low C design, and require to add a large amount of alloys such as Ni, Cu, Mo that process system is narrow partially simultaneously, its low-temperature flexibility is merely-20 ℃ of impact properties.
Patent 2 (publication number JP06306459A), table 2 is seen in its composition design.
The design of table 2 patent 2 compositions (wt, %)
Figure BSA00000262626500021
Its technology is that steel billet is heated to 1000-1200 ℃, and hot rolling finishing temperature 650-900 ℃, the cooling rate above with 5 ℃/s is cooled to below 500 ℃.
In the composition design of this patent, Si content is higher, is difficult for welding, and final cooling temperature is on the low side simultaneously, is not suitable for hot-rolled coil technology, does not possess good low-temperature flexibility simultaneously.
Patent 3 (publication number JP10008191A), table 3 is seen in its composition design.
The design of table 3 patent 3 compositions (wt, %)
Figure BSA00000262626500022
This material must weld having under the good welding conditions.
In the composition design of this patent, C content is higher, and is harsh to the welding conditional request, do not possess good low-temperature flexibility simultaneously.
Patent 4 (JP58093855A), table 4 is seen in its composition design.
The design of table 4 patent 4 compositions (wt, %)
Figure BSA00000262626500023
This material forms different solid solutions and separates out effect through different alloy combination, has anti-preferably guttering corrosion performance.
In the composition design of this patent, must add the Cu element, cost of alloy is higher, does not possess good low-temperature flexibility simultaneously.
Patent 5 (JP58093855A), table 5 is seen in its composition design.
The design of table 5 patent 5 compositions (wt, %)
This material has good corrosion resistance and wear resistance.
In the composition design of this patent, must add a large amount of Cr elements, be the high quality steel product, not possess good low-temperature flexibility simultaneously.
Patent 6 (JP59096244A), table 6 is seen in its composition design.
The design of table 6 patent 6 compositions (wt, %)
Figure BSA00000262626500032
This material forms different solid solutions and separates out effect through different alloy combination, has anti-preferably guttering corrosion performance.
In the composition design of this patent, must add the Cu element, cost of alloy is higher, does not possess good low-temperature flexibility simultaneously.
Patent 7 (JP54136519A), table 7 is seen in its composition design.
The design of table 7 patent 7 compositions (wt, %)
Figure BSA00000262626500033
This material has abrasion resisting performance preferably.
In the composition design of this patent, for high C design, must add elements such as Cr, Mo simultaneously, cost of alloy is higher, does not possess good low-temperature flexibility simultaneously.
Summary of the invention
The objective of the invention is to overcome the deficiency that above-mentioned prior art exists, in the composition design, perhaps adopt low C to add elements such as noble metal Mo, V, Nb, cost of alloy is high; Perhaps adopt alloy designs such as the high Si of high C; Problems such as weldableness and low-temperature flexibility are bad; A kind of rational Match and weldability that can satisfy common pipe line steel obdurability is provided, and the slurry that possesses certain wear resistance and good low-temperature performance is again carried with pipeline steel and method of manufacture thereof.
The present invention is achieved in that this slurry line of pipes with good low-temperature toughness with the chemical ingredients proportioning (weight percent) of steel as follows: C:0.10%-0.20%, Si:0.10%-0.30%; Mn:0.80%-1.50%, P :≤0.018%, S :≤0.004%; Ti:0.010%-0.035%; Als:0.02%-0.05%, N :≤0.006%, all the other are Fe and inevitable element.
It is even tiny ferritic+pearlitic structure that slurry line of pipes of the present invention uses the metallographic structure of steel.
The present invention is based on following reason and select alloying element kind and content:
C: carbon is the most most economical element of proof strength, and along with the massfraction increase of C, intensity, hardness increase thereupon, and therefore, carbon content should not be low excessively; But the too high impelling strength and the welding property that will influence product of carbon content it is considered herein that the slurry line of pipes is used steel that carbon should be controlled at 0.10%-0.20%.
Si: silicon can play the solution strengthening effect, but its too high levels can make the plasticity of steel and toughness reduce, and it is considered herein that the slurry line of pipes is used steel that its scope should be at 0.10%-0.30%.
Mn: manganese has the solution strengthening effect, can also increase stabilization of austenite, and is also favourable to improving hardening capacity, effectively guarantees the intensity of steel.But manganese content is excessive, can increase the center segregation tendency of continuously cast bloom, forms perlite band tissue simultaneously easily, influences the homogeneity of structure of hot-strip, it is considered herein that the slurry line of pipes is used steel that its scope should be at 0.80%-1.50%.
P: phosphorus is harmful element in the steel, increases the cold shortness of steel, and welding property is degenerated, and reduces plasticity, and cold-bending property is degenerated, and P is rising A simultaneously 3The element of point, thus hot rolling when cooling generate ferritic here earlier, and the C dentrite limb of being ostracised, and generate perlite, thus cause the ferritic one perlite banded structure of P segregation, therefore should control its content≤0.018%.
S: sulphur is harmful element in the steel, generates MnS with Mn and is mingled with, and makes steel produce red brittleness, reduces the ductility and the toughness of steel, for guaranteeing the high cleanliness of molten steel, should control its content≤0.004%.
Ti: titanium can form TiN with nitrogen and stop austenite crystal to be grown up, but the original grain before the refinement open rolling; The Ti that separates out in the austenite high-temperature zone when rolling (CN) particle blocks austenitic recrystallization process, final refinement ferrite crystal grain, and the toughness of heat affected zone has obvious effect when improving the steel welding simultaneously, and its suitable scope is 0.010%-0.035%.
The slurry line of pipes that the present invention has a good low-temperature toughness with the method for manufacture of steel comprise hot metal pretreatment, molten steel smelting, external refining and sheet billet continuous casting, continuously cast bloom reheat, rolling, cool off and batch.It is characterized in that:
1) smelt continuous casting process: hot metal pretreatment, converter smelting---through top blast or top bottom blowing; External refining---handle and carry out calcium and handle with the control inclusion morphology and improve ductility, toughness and the cold-bending property of steel through RH vacuum-treat, the desulfurization of LF stove; Sheet billet continuous casting is processed continuous casting steel billet---and continuous casting adopts induction stirring or dynamically gently depresses, to improve the quality of continuous casting steel billet.
2) rolling technology: continuous casting steel billet is heated to 1160-1300 ℃ through process furnace; With after the hot continuous mill group adopts the controlled rolling of two stages, the fs start rolling temperature is 1130-1200 ℃, and finishing temperature is greater than 1020 ℃; The subordinate phase start rolling temperature is less than 1000 ℃; Finishing temperature is 780-880 ℃, rolls the back coiled sheet and cools off with the speed of 5-20 ℃/s, carries out coiled sheet at 550-680 ℃ and batches.
3) even tiny ferritic+pearlitic structure, in order to obtain rational obdurability coupling, the operation of rolling must guarantee to obtain equiaxial even grained, its grain fineness number >=9 grade.Will in the operation of rolling, make grain refining and homogenizing, it is rolling to carry out multi-pass in the austenite recrystallization temperature interval, makes steel carry out abundant recrystallize, obtains tiny austenite structure; Through the rational cooling system of control, like speed of cooling, the temperature of curling etc., form the tiny perlite of refinement ferritic and disperse distribution simultaneously, its banded structure also is eliminated basically, banded structure≤2 grade.
The ys R of 4) hot rolling attitude coiled sheet T0.5Be 300-500MPa, tensile strength R mBe 450-650MPa, unit elongation A 50mmBe 35-50%, yield tensile ratio R T0.5/ R mBe 0.72-0.86.
-60 ℃ of ballistic works of 5) hot rolling attitude coiled sheet can reach more than the 150J, and-35 ℃ of shear area MVs that drop hammer can reach more than 85%.
The hardness of 6) hot rolling attitude coiled sheet can reach 170-230HV10.
Compared with prior art; Technical scheme composition of the present invention is designed to little Ti and handles the C-Mn steel, does not contain valuable alloying element (Nb, Mo, V etc.), and C content is moderate; The weldableness and the low-temperature impact toughness of coiled sheet are good; And have certain resistance to abrasion, and improve intensity with proper C replacement precious metal Mo, V, Cr, reduce the cost of alloy of steel mill; The content of S, P harmful element is controlled in strictness, effectively guarantees the good low-temperature flexibility that has of this steel grade; Adopt suitable composition design and production technique to form uniform ferritic+pearlitic structure, when guaranteeing product strength, have good low-temperature impact toughness and higher hardness again.
Description of drawings
Fig. 1 is the metallographic structure (ferritic+perlite) of the embodiment of the invention 2.
Embodiment
Through embodiment the present invention is done further description below.
The chemical ingredients of embodiment of the invention steel is seen table 8, and rolling technology is seen table 9, and hot rolling attitude mechanical property is seen table 10, and series of temperatures is impacted and block hammer performance is seen table 11.
Visible by table 10 and table 11, adopt steel grade of the present invention and technology, can produce and satisfy the performance requriements of slurry line of pipes with steel.
Table 8 test steel chemical composition (wt, %)
Embodiment C Si Mn P S Ti Als N
1 0.12 0.15 0.95 0.012 0.002 0.010 0.038 0.0042
2 0.14 0.20 1.05 0.014 0.001 0.019 0.031 0.0044
3 0.14 0.12 1.23 0.008 0.002 0.024 0.026 0.0043
4 0.15 0.19 1.35 0.013 0.001 0.028 0.024 0.0035
5 0.17 0.12 1.34 0.009 0.001 0.018 0.025 0.0039
Table 9 test steel technology
Figure BSA00000262626500071
Table 10 test steel hot rolling attitude mechanical property
Figure BSA00000262626500072
Table 11 test steel series of temperatures is impacted and block hammer performance

Claims (5)

1. the slurry line of pipes with good low-temperature toughness is used steel, it is characterized in that the chemical component weight per-cent of this steel is following: C:0.10%-0.20%, Si:0.10%-0.30%; Mn:0.80%-1.50%, P :≤0.018%, S :≤0.004%; Ti:0.010%-0.035%; Als:0.02%-0.05%, N :≤0.006%, all the other are Fe and inevitable element.
2. slurry line of pipes according to claim 1 is used steel, and the metallographic structure that it is characterized in that this steel is even tiny ferritic+pearlitic structure, its grain fineness number >=9 grade.
3. claim 1 or 2 said slurry line of pipes are with the method for manufacture of steel; Comprise hot metal pretreatment, molten steel smelting, external refining, continuous casting and hot rolling, it is characterized in that continuous casting steel billet is heated to 1160-1300 ℃ through process furnace, adopts the controlled rolling of two stages through the hot continuous rolling unit; The fs start rolling temperature is 1130-1200 ℃; Finishing temperature is greater than 1020 ℃, and the subordinate phase start rolling temperature is less than 1000 ℃, and finishing temperature is 780-880 ℃; Roll the back coiled sheet and cool off, batch at 550-680 ℃ with the speed of 5-20 ℃/s.
4. slurry line of pipes according to claim 3 is characterized in that with the method for manufacture of steel described external refining comprises RH vacuum-treat, the desulfurization processing of LF stove and calcium processing.
5. slurry line of pipes according to claim 3 is with the method for manufacture of steel, it is characterized in that described continuous casting adopts induction stirring or dynamically gently depresses.
CN2010102764276A 2010-09-07 2010-09-07 Slurry feed line steel with good low-temperature toughness and manufacturing method thereof Pending CN102400039A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102776445A (en) * 2012-07-27 2012-11-14 攀枝花贝氏体耐磨管道有限公司 Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube
CN103255337A (en) * 2013-04-24 2013-08-21 河北钢铁股份有限公司邯郸分公司 Production method of low-cost easily-welded steel
CN103469070A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Steel for straight welded oil casing pipes and production method thereof
CN103469072A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Straight welded oil casing pipe and manufacturing method thereof
CN103667882A (en) * 2013-12-26 2014-03-26 马钢(集团)控股有限公司 High-plasticity steel hot-rolled coil for welded gas cylinder and production technology of high-plasticity steel hot-rolled coil
CN103725958A (en) * 2013-12-26 2014-04-16 马钢(集团)控股有限公司 Steel hot rolled plate coil for economical welded gas cylinder and production process thereof
CN103882302A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 Steel for N80-Q grade straight welded oil casings and manufacturing method thereof
CN103882301A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 J55 grade low-cost steel used for electric resistance welding oil casing pipe and manufacturing method thereof
CN105695869A (en) * 2014-11-27 2016-06-22 上海梅山钢铁股份有限公司 Hot rolled sheet steel with 450MPa grade yield strength for bridges and manufacturing method thereof
CN107385319A (en) * 2016-05-16 2017-11-24 上海梅山钢铁股份有限公司 Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method
CN107557681A (en) * 2017-08-02 2018-01-09 邢台钢铁有限责任公司 A kind of middle low carbon steel wire rod and its production method with excellent deformation performance
CN110699599A (en) * 2019-09-25 2020-01-17 南京钢铁股份有限公司 Q345R steel for ultralow temperature and manufacturing method thereof
CN110842484A (en) * 2019-11-28 2020-02-28 河北恒通管件集团有限公司 Process for manufacturing hot-pressing low-temperature tee joint by utilizing X60 steel plate
CN111996461A (en) * 2020-09-07 2020-11-27 鞍钢股份有限公司 X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof

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CN101624688A (en) * 2009-08-14 2010-01-13 首钢总公司 X70 station yard steel with excellent toughness and large wall thickness and production method thereof
CN101736196A (en) * 2008-11-18 2010-06-16 鞍钢股份有限公司 Steel for induction heating syphon for oil gas transportation and method for producing hot rolled slab thereof
CN101818308A (en) * 2009-02-27 2010-09-01 鞍钢股份有限公司 Steel for longitudinal resistance welded pipe with low yield ratio and manufacturing method thereof

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CN101451217A (en) * 2007-11-30 2009-06-10 舞阳钢铁有限责任公司 Steel for pipeline and method for producing the same
CN101619416A (en) * 2008-06-30 2010-01-06 鞍钢股份有限公司 High-strength X100 pipe line steel hot rolling flat plate and method for manufacturing same
CN101736196A (en) * 2008-11-18 2010-06-16 鞍钢股份有限公司 Steel for induction heating syphon for oil gas transportation and method for producing hot rolled slab thereof
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102776445B (en) * 2012-07-27 2014-01-29 攀枝花贝氏体耐磨管道有限公司 Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube
CN102776445A (en) * 2012-07-27 2012-11-14 攀枝花贝氏体耐磨管道有限公司 Lower bainite wear-resisting steel tube for slurry transport and production method of steel tube
CN103882301A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 J55 grade low-cost steel used for electric resistance welding oil casing pipe and manufacturing method thereof
CN103882302B (en) * 2012-12-21 2016-03-02 鞍钢股份有限公司 N80-Q level straight weld oil annular tube steel and manufacture method thereof
CN103882301B (en) * 2012-12-21 2016-01-20 鞍钢股份有限公司 J55 level Low-cost electric welding resistance oil casing pipe steel and manufacture method thereof
CN103882302A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 Steel for N80-Q grade straight welded oil casings and manufacturing method thereof
CN103255337A (en) * 2013-04-24 2013-08-21 河北钢铁股份有限公司邯郸分公司 Production method of low-cost easily-welded steel
CN103255337B (en) * 2013-04-24 2014-12-10 河北钢铁股份有限公司邯郸分公司 Production method of low-cost easily-welded steel
CN103469070A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Steel for straight welded oil casing pipes and production method thereof
CN103469072A (en) * 2013-09-07 2013-12-25 鞍钢股份有限公司 Straight welded oil casing pipe and manufacturing method thereof
CN103725958A (en) * 2013-12-26 2014-04-16 马钢(集团)控股有限公司 Steel hot rolled plate coil for economical welded gas cylinder and production process thereof
CN103667882A (en) * 2013-12-26 2014-03-26 马钢(集团)控股有限公司 High-plasticity steel hot-rolled coil for welded gas cylinder and production technology of high-plasticity steel hot-rolled coil
CN105695869A (en) * 2014-11-27 2016-06-22 上海梅山钢铁股份有限公司 Hot rolled sheet steel with 450MPa grade yield strength for bridges and manufacturing method thereof
CN107385319A (en) * 2016-05-16 2017-11-24 上海梅山钢铁股份有限公司 Yield strength 400MPa level Precision Welded Pipe steel plates and its manufacture method
CN107557681A (en) * 2017-08-02 2018-01-09 邢台钢铁有限责任公司 A kind of middle low carbon steel wire rod and its production method with excellent deformation performance
CN107557681B (en) * 2017-08-02 2019-05-17 邢台钢铁有限责任公司 A kind of middle low carbon steel wire rod and its production method with excellent deformation performance
CN110699599A (en) * 2019-09-25 2020-01-17 南京钢铁股份有限公司 Q345R steel for ultralow temperature and manufacturing method thereof
CN110842484A (en) * 2019-11-28 2020-02-28 河北恒通管件集团有限公司 Process for manufacturing hot-pressing low-temperature tee joint by utilizing X60 steel plate
CN111996461A (en) * 2020-09-07 2020-11-27 鞍钢股份有限公司 X70 pipeline coiled plate for microalloyed resistance welded pipe and production method thereof

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Application publication date: 20120404