CN102392187A - Cr-containing pipeline steel X70 hot-rolled plate and production method - Google Patents
Cr-containing pipeline steel X70 hot-rolled plate and production method Download PDFInfo
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- CN102392187A CN102392187A CN2011103698562A CN201110369856A CN102392187A CN 102392187 A CN102392187 A CN 102392187A CN 2011103698562 A CN2011103698562 A CN 2011103698562A CN 201110369856 A CN201110369856 A CN 201110369856A CN 102392187 A CN102392187 A CN 102392187A
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Abstract
The invention relates to a Cr-containing pipeline steel X70 hot-rolled plate and a production method, and belongs to the technical field of steel materials. The Cr-containing pipeline steel X70 hot-rolled plate comprises the following components by weight: 0.030-0.080% of C, 1.55-2.00% of Mn, 0.10-0.40% of Si, not more than 0.0050% of S, not more than 0.015% of P, 0.035-0.060% of Nb, 0.008-0.025% of Ti, 0.020-0.060% of Alt, 0.15-0.30% of Cr, and the balance of Fe and inevitable impurities. The production method of the invention realizes the purposes of crystal grain refinement, pipeline steel strength and toughness improvement by using a steckel mill production line and through processes of continuous casting, rolling and cooling. The performance of hot-rolled plates produced by the production method of the invention is superior to standard requirements of X70 pipeline steel plates, and the cost advantage is obvious.
Description
Technical field:
The present invention relates to HS, H.T. pipe line steel X70 and the working method thereof of a kind of utilization composition system production cheaply.A kind of specifically pipe line steel X70 hot rolled slab and working method thereof that contains Cr belongs to steel material technical field.
Background technology:
Pipe line steel be meant be used for transfer oil, Sweet natural gas etc. big mouthful through Welded Steel Pipe with hot-rolled coil or Wide and Thick Slab.Pipe line steel in use except that requiring to have the higher compressive strength, also requires to have higher low-temperature flexibility and good welding property.Along with the continuous increase of oil nature gas demand, the transfer pressure of pipeline and caliber also constantly increase, to increase its transport efficiency.Consider the structural stability and the security of pipeline, also need increase the intensity of thickness of pipe and progressive tubing.Therefore, develop towards thick specification and HS direction as the pipeline steel capital of this type transfer lime.21 century is the peak time that China's pneumatic tube is built.By the end of the year 2010; Two the large-scale pipe engineerings of gas transmission of transferring natural gas from the west to the east build up basically; The important engineerings such as three-way engineering, middle remote pipe engineering of transferring natural gas from the west to the east in addition the coming years construction that will start; Its main line is used X80 level steel in enormous quantities, and the supporting pipe-networks engineering in branch line engineering and domestic a large amount of city needs more large batch of X70 pipe line steel, so the market demand of pipe line steel X70 can be very big.
All contain valuable alloying elements such as Mo, Ni in the chemical ingredients of the pipe line steel X70 that produces on the market now; At publication number CN200410066297.8; Contain 0.10 ~ 0.30% Mo in the X70 pipe line steel composition system of introducing in the denomination of invention " acicular ferrite type X70 pipe line steel and method of manufacture thereof " with high arrest toughness; In the X70 pipe line steel composition system that other related patent U.S. Patent No. and pertinent literature are introduced, generally also all contain valuable alloying elements such as Mo, Ni.The adding of these valuable alloying elements has significantly improved the cost of alloy of X70.Some chemical ingredients systems of pipe line steel X70 that do not contain valuable alloying elements such as Mo, Ni are comparatively complicated, and its manufacturing condition requires sternlyer, and production cost is also than higher.
The price of steel industry upstream materials such as iron ore, coal sharp rises in recent years, and the steel industry production cost sharply rises.But; Domestic iron and steel enterprises strengthens research and development and production dynamics in recent years; Competition is growing more intense; Under the rolled steel market situation at home, who can take the lead in developing the production technology of high quality and low-cost pipe line steel Wide and Thick Slab X70, and who will stand on the invincible position in the domestic and international pipe line steel market competition of 21st century.
Summary of the invention:
To the problem of above-mentioned existence, the invention provides pipe line steel X70 hot rolled slab and the working method of a kind of Cr of containing.The pipe line steel X70 hot rolled slab that contains Cr that the present invention produces is less to the ys influence because Cr can significantly improve tensile strength, and yield tensile ratio control is good, is lower than 0.88; The present invention adopts the chemical ingredients system of lower cost, production contain Cr pipe line steel X70 hot rolled slab, its performance is superior to standard-required.Press 0.15%Mo and 0.20%Ni content and adjust, consider the alloy specific absorption, ton steel cost is reduced in more than 700 yuan.
Technical scheme of the present invention is achieved in that
A kind of pipe line steel X70 hot rolled slab that contains Cr, components by weight percentage comprises following moity:
C:0.030 ~ 0.080%, Mn:1.55 ~ 2.00%, Si:0.10 ~ 0.40%%, S≤0.0050%; P :≤0.015%, Nb:0.035 ~ 0.060%, Ti:0.008 ~ 0.025%; Alt:0.020 ~ 0.060%, Cr:0.15 ~ 0.30%, its surplus is Fe and inevitable impurity.
A kind of working method that contains the pipe line steel X70 hot rolled slab of Cr, this method comprises: top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, the laminar flow cooling, heat is rectified and cold operation such as rectify, wherein,
Described wide plate base continuous casting is to utilize dynamically gently to depress the center segregation that improves strand: total reduction 2 ~ 3mm, depress speed 0.6～1.1mm/min;
Described Steckel mill is rolling to be may further comprise the steps:
(1) slab reheat, temperature: 1150 ~ 1280 ℃;
(2) recrystallize is rolling, temperature: 1100 ~ 1000 ℃, adopt one or more passages rolling, percentage pass reduction >=15%, total draft >=50%;
(3) non-recrystallization is rolling, temperature: 950 ~ 760 ℃, adopt one or more passages rolling, percentage pass reduction >=10%, accumulated deformation rate >=60%;
(4) finish to gauge, temperature: 830 ~ 760 ℃;
Described laminar flow refrigerative final cooling temperature is interval: 550 ~ 450 ℃, and 10 ~ 30 ℃/s of controlled chilling speed.
The working method of the pipe line steel X70 hot rolled slab of a kind of Cr of containing of the present invention is applicable to the Steckel mill production line, also is suitable for traditional middle plate mill production line.
The reason of the chemical ingredients system that the present invention adopts is:
Carbon (C): along with carbon content increases, the intensity of steel increases and toughness, welding property reduce.But because reaching its maturity of cooling controlling and rolling controlling process and micro-alloying technology is the performance of improving welded heat affecting zone (HAZ) simultaneously, the carbon content in the steel reduces gradually, and X70 pipe line steel carbon content should be advisable below 0.08%.
Manganese (Mn): Mn has the solution strengthening effect, also can reduce γ-α transformation temperature, and then the refinement ferrite crystal grain.When adding 1.5% ~ 2.0%Mn, can obtain acicular ferrite structure; Mn also can improve toughness, reduce ductile-brittle transition temperature.
Silicon (Si): when steel-making generally as reductor, but also can be used as alloying element.Si gets into ferritic and plays the solution strengthening effect; The tensile strength and the less degree that can significantly improve steel improve ys; But reduce toughness, the plasticity of steel simultaneously to a certain extent, Si increases the timeliness susceptibility of steel simultaneously, and can improve the resistance to corrosion and the oxidation-resistance property of steel.
Niobium (Nb): Nb can postpone austenite recrystallization, reduce transformation temperature, the performance that obtains to require through mechanism such as solution strengthening, phase transformation strengthening, precipitation strengths.0.035 ~ 0.060%Nb steel cooperates rational rolling technology, can obtain uniform acicular ferrite structure and excellent toughness.
Chromium (Cr): along with the interpolation of Cr, tensile strength is close to straight line and rises, and the ys variation is less.When Cr content surpassed 0.3%, its low-temperature flexibility will obviously descend; In order to remedy the loss of strength that Mo brings, add 0.15 ~ 0.30% Cr, purpose is to improve tensile strength, can suitably reduce yield tensile ratio simultaneously.
Titanium (Ti): the Ti disperse of in the solidification of molten steel process, separating out of trace, tiny TiN particle can suppress growing up of austenite crystal, and a original austenite grains when preventing the slab reheat is too grown up, and for rolling tiny relatively austenite structure are provided; Two stop the heat affected zone austenite crystal to be grown up when welding, improve welding property.During the Ti too high levels, the TiN particle is grown up, and loses the effect that stops grain growth; Its content is controlled at 0.008 ~ 0.030% and is advisable.
Aluminium (Al): utilize Al in refining process with steel in residual oxygen combine Al
2O
3, and in refining and casting process, fully float, to reduce the oxygen level in the steel as far as possible, can prevent that the trace Ti that adds in the steel from combining with oxygen simultaneously, to guarantee in the final steel a certain amount of tiny TiN particle being arranged.
Impurity element is to the harm of pipe line steel structure property:
Sulphur (S): sulphur is one of the most deleterious element in the pipe line steel, anti-HIC of its severe exacerbation pipe line steel and SCC performance.Simultaneously, sulphur also influences the impelling strength of pipe line steel; In addition, sulphur also causes the pipe line steel anisotropy, and toughness worsens on horizontal and thickness direction; Therefore, sulphur content is the harshest index of pipe line steel requirement, and high-grade pipe line steel requires w (S) less than 0.005%.
Phosphorus (P): phosphorus is a kind of easy segregation element in pipe line steel, especially as w (P)>during 0 .015%, the segregation of phosphorus sharply increases; And impel segregation line hardness to increase, make the HIC degradation, simultaneously; Phosphorus also worsens welding property; Significantly reduce the low-temperature impact toughness of steel, improve the brittle transition temperature of steel, it is cold short that steel pipe is taken place.Should the strict phosphorus content of controlling in the steel for high-quality pipe line steel.
Working method of the present invention can crystal grain thinning, improves pipe line steel intensity and toughness.
Steel billet is heated to abundant high temperature and makes the austenite structure homogenizing, and the carbonitride of the niobium in the steel is fully dissolved, and tiny titanium nitride does not dissolve, to stop growing up of original austenite grains.
But the fs is rolling in the TR of austenite recrystallize, adopts the rolling steel billet of one or more passages, and austenite accumulative total deflection is greater than 50%, through austenite recrystallize refine austenite crystal grain repeatedly.Subordinate phase is rolling in austenite non-recrystallization TR; Utilize the precipitate of niobium to postpone the austenite recrystallization effect, adopt one or more passages rolling, austenite accumulative total deflection is greater than 60%; Form the extended austenite crystal; In the extended austenite crystal, form a large amount of deformed belts, make austenite increase considerably, fully the ferrite crystal grain after the refinement phase transformation to the forming core point of ferrite transformation.The rolling control finishing temperature of austenite non-recrystallization is between 830 ~ 760 ℃, and with the online acceleration cooling of the rate of cooling of 10 ~ 30 ℃/s, final cooling temperature is between 550 ~ 450 ℃ after the steel plate finish to gauge; Through quickening cooling, reduce transformation temperature, promote ferritic intracrystalline forming core; Ferrite crystal grain is grown up after stoping phase transformation; Further refinement ferrite crystal grain obtains finally that crystal grain is tiny, the acicular ferrite structure of high density dislocation structure, improves armor plate strength and low-temperature impact toughness simultaneously.
Beneficial effect of the present invention:
A kind of pipe line steel X70 hot rolled slab that contains Cr that the present invention produces is compared with existing pipe line steel X70, has the following advantages:
1, adopt the chemical ingredients system of lower cost, the plate property of the pipe line steel X70 hot rolled slab that contains Cr of production can satisfy even be superior to standard-required; Press 0.15%Mo and 0.20%Ni content and adjust, consider the alloy specific absorption, the ton steel can be practiced thrift nickel plate 2kg and the molybdenum-iron 3kg that contains molybdenum 60%; By existing market price, ton steel cost is reduced in more than 700 yuan.
2, less to the ys influence because Cr can significantly improve tensile strength, the X70 pipeline steel plate yield tensile ratio control that the present invention produces is good, is lower than 0.88, can satisfy even be superior to standard-required.
3, working method of the present invention can crystal grain thinning, improves pipe line steel intensity and toughness.
Embodiment:
Below in conjunction with specific embodiment the present invention is done further detailed description.
Embodiment one
Below use Steckel mill production line production product specification to be example, the present invention is further described as the pipe line steel X70 hot rolled slab that contains Cr of 19.1mm.
The production product specification be 19.1mm contain Cr pipe line steel X70 hot rolled slab, components by weight percentage comprises following moity: C:0.07%; Si:0.20%, Mn:1.80%, P:0.009%; S:0.003%, Nb:0.050%, Ti:0.012%; Cr:0.18%, Alt:0.035%, surplus is Fe and inevitable impurity.
Operational path comprises mainly that top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, laminar flow cooling, heat are rectified, cold operation such as rectify; Concrete production technique is seen the embodiment one of table 1.
The Cr pipe line steel X70 hot rolled slab service check result that contains through this explained hereafter sees table 2.
Embodiment two
Below use Steckel mill production line production product specification to be example, the present invention is further described as the pipe line steel X70 hot rolled slab that contains Cr of 19.1mm.Components by weight percentage, it comprises following moity: C:0.07%, Si:0.18%, Mn:1.78%, P:0.0010%, S:0.004%, Nb:0.052%, Ti:0.014%, Cr:0.28%, Alt:0.040%, surplus is Fe and inevitable impurity.
Operational path comprises mainly that top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, laminar flow cooling, heat are rectified, cold operation such as rectify; Concrete production technique is seen the embodiment two of table 1.
The Cr pipe line steel X70 hot rolled slab service check result that contains through this explained hereafter sees table 2.
Can find out by table 2; Embodiment one and embodiment two produce the ys Rp0.2 and the tensile strength Rm of the pipe line steel X70 hot rolled slab that contains Cr than standard the surplus capacity more than the 50MPa is arranged all; Elongation A value is far above standard-required (requiring the strictest transfering natural gas from the west to the east two line standards with reference to each item); 0.90 ,-20 ℃ of summers that yield tensile ratio Rp0.2/Rm is starkly lower than standard-required also are superior to standard-required than v-notch ballistic work and-15 ℃ of ram's horn test shear area ratios.Adopt the chemical ingredients system of the inventive method and the complete standard-required that can satisfy and be superior to X70 pipeline steel plate of steel plate of rolling technology production.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.
Claims (2)
1. pipe line steel X70 hot rolled slab that contains Cr, it is characterized in that: components by weight percentage comprises following moity: C:0.030 ~ 0.080%; Mn:1.55 ~ 2.00%, Si:0.10 ~ 0.40%%, S≤0.0050%; P :≤0.015%, Nb:0.035 ~ 0.060%, Ti:0.008 ~ 0.025%; Alt:0.020 ~ 0.060%, Cr:0.15 ~ 0.30%, its surplus is Fe and inevitable impurity.
2. a kind of working method that contains the pipe line steel X70 hot rolled slab of Cr as claimed in claim 1; This method comprises: top and bottom combined blown converter, LF refining, VD vacuum outgas, wide plate base continuous casting, Steckel mill are rolling, the laminar flow cooling, heat is rectified and cold operation such as rectify, and it is characterized in that:
Described wide plate base continuous casting is to utilize dynamically gently to depress the center segregation that improves strand: total reduction 2 ~ 3mm, depress speed 0.6～1.1mm/min;
Described Steckel mill is rolling to be may further comprise the steps:
(1) slab reheat, temperature: 1150 ~ 1280 ℃;
(2) recrystallize is rolling, temperature: 1100 ~ 1000 ℃, adopt one or more passages rolling, percentage pass reduction >=15%, total draft >=50%;
(3) non-recrystallization is rolling, temperature: 950 ~ 760 ℃, adopt one or more passages rolling, percentage pass reduction >=10%, accumulated deformation rate >=60%;
(4) finish to gauge, temperature: 830 ~ 760 ℃;
Described laminar flow refrigerative final cooling temperature is interval: 550 ~ 450 ℃, and 10 ~ 30 ℃/s of controlled chilling speed.
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Cited By (11)
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| CN103042039A (en) * | 2013-01-05 | 2013-04-17 | 马钢(集团)控股有限公司 | Controlled rolling and cooling process for Cr-containing economic X70 pipeline hot-rolled steel coil plate |
| CN103468905A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | 485MPa grade pipeline steel hot-rolled coil plate and manufacturing method thereof |
| CN104498833A (en) * | 2014-12-12 | 2015-04-08 | 本钢板材股份有限公司 | Low-cost X70 pipeline steel and rolling process thereof |
| CN105463317A (en) * | 2015-11-25 | 2016-04-06 | 武汉钢铁(集团)公司 | Low-yield-ratio hot rolling pipeline original steel roll or sheared steel plate and manufacturing method of original steel roll or sheared steel plate |
| CN109234612A (en) * | 2018-08-20 | 2019-01-18 | 安阳钢铁股份有限公司 | A kind of high tenacity hot-rolled low carbon containing B bainite steel plate and its production method |
| CN109252089A (en) * | 2018-08-20 | 2019-01-22 | 安阳钢铁股份有限公司 | A kind of stress design pipe line steel X65 steel plate and its production method |
| CN110453157A (en) * | 2019-08-01 | 2019-11-15 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of low yield strength ratio thin gauge pipe line steel |
| CN112143975A (en) * | 2020-09-30 | 2020-12-29 | 江苏沙钢集团有限公司 | Economical high-efficiency X70-grade pipeline steel and manufacturing method thereof |
| CN112322875A (en) * | 2020-10-10 | 2021-02-05 | 江阴兴澄特种钢铁有限公司 | Method for producing X70 pipeline steel plate with 3-8mm ultrathin specification and used under ultralow temperature condition by using curling furnace |
| CN114107816A (en) * | 2021-11-23 | 2022-03-01 | 山东钢铁集团日照有限公司 | X65 MS-grade acid-resistant pipeline steel hot-rolled coil with low cost and high strength and toughness and preparation method thereof |
| GB2622886A (en) * | 2022-09-27 | 2024-04-03 | Shandong Steel Group Rizhao Co Ltd | Low temperature impact resistant steel produced by continuous variable crown (CVC) steckel mill and preparation method and use thereof |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042039A (en) * | 2013-01-05 | 2013-04-17 | 马钢(集团)控股有限公司 | Controlled rolling and cooling process for Cr-containing economic X70 pipeline hot-rolled steel coil plate |
| CN103468905A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | 485MPa grade pipeline steel hot-rolled coil plate and manufacturing method thereof |
| CN103468905B (en) * | 2013-09-06 | 2016-03-02 | 鞍钢股份有限公司 | A kind of 485MPa level line steel hot rolling roll bending and manufacture method thereof |
| CN104498833A (en) * | 2014-12-12 | 2015-04-08 | 本钢板材股份有限公司 | Low-cost X70 pipeline steel and rolling process thereof |
| CN105463317A (en) * | 2015-11-25 | 2016-04-06 | 武汉钢铁(集团)公司 | Low-yield-ratio hot rolling pipeline original steel roll or sheared steel plate and manufacturing method of original steel roll or sheared steel plate |
| CN109252089A (en) * | 2018-08-20 | 2019-01-22 | 安阳钢铁股份有限公司 | A kind of stress design pipe line steel X65 steel plate and its production method |
| CN109234612A (en) * | 2018-08-20 | 2019-01-18 | 安阳钢铁股份有限公司 | A kind of high tenacity hot-rolled low carbon containing B bainite steel plate and its production method |
| CN109252089B (en) * | 2018-08-20 | 2020-11-06 | 安阳钢铁股份有限公司 | Strain design pipeline steel X65 steel plate and production method thereof |
| CN110453157A (en) * | 2019-08-01 | 2019-11-15 | 江阴兴澄特种钢铁有限公司 | A kind of manufacturing method of low yield strength ratio thin gauge pipe line steel |
| CN112143975A (en) * | 2020-09-30 | 2020-12-29 | 江苏沙钢集团有限公司 | Economical high-efficiency X70-grade pipeline steel and manufacturing method thereof |
| CN112322875A (en) * | 2020-10-10 | 2021-02-05 | 江阴兴澄特种钢铁有限公司 | Method for producing X70 pipeline steel plate with 3-8mm ultrathin specification and used under ultralow temperature condition by using curling furnace |
| CN112322875B (en) * | 2020-10-10 | 2022-05-06 | 江阴兴澄特种钢铁有限公司 | Method for producing X70 pipeline steel plate with 3-8mm ultrathin specification and used under ultralow temperature condition by using curling furnace |
| CN114107816A (en) * | 2021-11-23 | 2022-03-01 | 山东钢铁集团日照有限公司 | X65 MS-grade acid-resistant pipeline steel hot-rolled coil with low cost and high strength and toughness and preparation method thereof |
| GB2622886A (en) * | 2022-09-27 | 2024-04-03 | Shandong Steel Group Rizhao Co Ltd | Low temperature impact resistant steel produced by continuous variable crown (CVC) steckel mill and preparation method and use thereof |
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