CN104561825A - Low-cost X80 pipeline steel and manufacturing method thereof - Google Patents
Low-cost X80 pipeline steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a low-cost X80 pipeline steel and a manufacturing method thereof, wherein the steel comprises the following components in percentage by weight: 0.065 to 0.085 percent of C, 1.0 to 2.0 percent of Mn1, 0.25 to 0.35 percent of Si, 0.10 to 0.25 percent of Cu0.10 to 0.30 percent of Ni0.10 to 0.50 percent of Cr0.10 to 0.50 percent of Nb0.02 to 0.04 percent of Ti, 0.005 to 0.03 percent of V, 0.02 to 0.04 percent of Alt0.02 to 0.06 percent of Ca, less than or equal to 0.006 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.012 percent of N, and the balance of Fe and trace inevitable impurities. The hot rolling process is controlled as follows: heating temperature of the plate blank: 1100-1200 ℃; rolling temperature in recrystallization zone: 900-1150 ℃; rolling temperature of non-recrystallization zone: 700-950 ℃; the rolling termination temperature is as follows: 700-800 ℃; end cooling temperature: 350-450 ℃, cooling rate: 10-25 ℃/s, the invention has the advantages and effects that: the additive amount of the alloy elements is reduced, and the method has the advantages of low cost, high production efficiency, good comprehensive performance of products and the like.
Description
Technical field
The invention belongs to the technical field that pipe line steel is produced, be specifically related to a kind of low cost X80 pipeline hot-rolled steel sheet and manufacture method thereof.
Background technology
The change of energy structure in recent years and the growth to energy demand, greatly facilitate the development of long distance oil-gas line of pipes.For improving transport efficiency, reducing construction investment, long distance petroleum gas delivering pipe line steel becomes inexorable trend to Hi-grade steel development.
Under same transport condition, application Hi-grade steel pipe line steel product can make the wall thickness reduction of steel pipe, saves steel using amount, reduces construction investment and improve operating efficiency; Or transfer pressure is improved under the constant condition of pipe diameter, wall thickness, reach the object improving operational throughput.Pipe line steel grade of steel improve constantly the development trend becoming pipe line steel.At present, the most Hi-grade steel of the widely used pipe line steel in countries in the world has arrived X80(yield strength Rt0.5 >=555MPa), a small amount of test section have employed X100 and X120 steel pipe.
X80 as current main-stream grade of steel, also exist alloying element addition high, need the weak points such as thermal treatment, cause manufacturing cost remain high.Mo is the alloying element often added in pipe line steel, and it is expensive, as patent US5545270A, US5531842, WO2009119570, WO2009119579 all need to add considerable Mo element, improves and cost of goods manifactured.In addition, patent US5545270A, US5531842 need to carry out three stage rolling to steel billet, and add the complicacy of rolling technology, and in two-phase region rolling, rolling temperature is low, machine utilization is large.
Patent CN101456034A provides a kind of X70, X80 pipe line steel based on stress design requirement and preparation method thereof, its C content (0.02-0.05) wt%.C is as the strengthening element of cheapness, and its content of appropriate raising can save the addition of other alloying element, is conducive to reducing costs.
Patent WO2009125863 provides a kind of X80 and above level pipeline pipeline steel Preparation Method thereof, with the addition of the elements such as B, W, Zr, Ta, Mg in its steel, adds smelting molten steel and strand continuous casting difficulty.
Patent JP2009161824, JP2009174020, paper Development of ahigh-deformability linepipe with resistance to strain-aged hardening byHOP (heat-treatment on-line process), JFE Technical Report No.12 (Oct.2008), add burning optimization on line operation in disclosed X80 pipe line steel preparation technology, make process complications and thermal treatment cost is high.
Summary of the invention
The problem that toughness is low, cost is high is there is for above-mentioned pipeline steel, the invention provides a kind of low cost X80 pipeline hot-rolled steel sheet and production method thereof, to reduce the input of X80 pipe line steel in cost of alloy, manufacturing process, improve the over-all properties of product, realize the production of economical and efficient.
Low-cost and high-performance pipeline steel of the present invention, the weight percent of its moiety is: C0.065%-0.085%, Mn1.0%-2.0%, Si0.25%-0.35%, Cu0.10%-0.25%, Ni0.10%-0.30%, Cr0.10%-0.50%, Nb0.02%-0.04%, Ti0.005%-0.03%, V0.02%%-0.04%, Alt0.02-0.06%, Ca≤0.006%P≤0.015%, S≤0.003%, N≤0.012%, surplus is Fe and the inevitable impurity of trace.
The present invention preferably uses the thick continuously cast bloom of 230mm to produce the hot-rolled steel sheet that thickness specification is no more than 25mm.
In the present invention, the effect of main moiety is as follows:
C: strengthening element most economical, the most basic in steel, obvious effect is had to the intensity improving steel by solution strengthening and precipitation strength, but improve C content and have negative impact to the ductility of steel, toughness and weldability, for this reason, the C content upper limit is set as 0.085% by the present invention.Modern age, the evolution of pipe line steel was the process constantly reducing C content.In order to give full play to the precipitation strength effect of the elements such as Nb, improve strength of welded joint, the lower limit set of C content of the present invention is 0.065%.
Si: adding Si is in order to deoxidation in steelmaking process and the intensity improving matrix, in addition, adds Si and can reduce pearlitic precipitation, be conducive to the raising of matrix strength and toughness.But add excessive Si, the toughness of the welded heat affecting zone of mother metal will significantly reduce, and welding procedure performance in field also can be deteriorated.Therefore, Si content is 0.25%-0.35% in the present invention.
Mn: the intensity being improved steel by solution strengthening compensates the main and most economical strengthening element causing loss of strength because C content reduces in pipe line steel.Mn still expands the element of γ phase region, can reduce γ → α transformation temperature of steel, contributes to obtaining tiny phase-change product, can improve the toughness of steel, reduce ductile-brittle transition temperature.In order to the balance between proof strength and low-temperature flexibility, the minimum content of Mn is set as 1.0%.Improve the content of Mn, the hardenability characteristic of steel increases, and content is increased to a certain degree, and welding property can be caused to decline the toughness of especially severe exacerbation welded heat affecting zone.In addition, too high Mn content also can increase continuously cast bloom center segregation, and the anisotropy of plate property is increased.Therefore, Mn upper content limit of the present invention is designed to 2.0%.
Nb, V: be one of topmost element in modern microalloying pipe line steel, fairly obvious to the effect of grain refining.By in course of hot rolling containing Nb V Secondary phase particle strain induced precipitate hinder the recovery and recrystallization of deformed austeaite, make the deformed austeaite of non-recrystallization zone rolling be organized in phase transformation through controlled rolling and controlled cooling model to change tiny phase-change product into, to make steel, there is high strength and high tenacity.The present invention is exactly the effect coordinating C content to add appropriate Nb, V performance precipitate, and the present invention chooses Nb, V content range and is 0.02%-0.04%.
Ti: be strong solid N element, the stoichiometric ratio of Ti/N is 3.42, utilizes the Ti of about 0.01% just can fix the N of about 30ppm in steel, can form the TiN precipitated phase of tiny high-temperature stable when sheet billet continuous casting.Austenite Grain Growth when this tiny TiN particle can suppress slab to reheat effectively, contributes to improving the solid solubility of Nb in austenite, improves the impelling strength of welded heat affecting zone.When the content of Als too low (as lower than 0.005%), Ti can form oxide compound, and in these, raw particle can play the effect of Intragranular Acicular Ferrite forming core core, refinement welded heat affecting zone tissue.In order to obtain this effect, at least 0.005%Ti will be added.When Ti addition exceedes certain certain value, TiN particle will alligatoring, and the precipitation strength effect of TiC manifests, and causes low-temperature flexibility to worsen.Therefore, the present invention chooses Ti content range 0.005%-0.03%.
Cr: be expand γ phase region, first separate out ferrite when postponing γ → α phase transformation to be formed, promote the principal element that acicular ferrite is formed, to control, phase-change organization plays an important role, add in Ultra-low carbon pipe line steel under certain cooling conditions and finishing temperature, just can obtain obvious acicular ferrite and bainite structure, simultaneously because phase transformation changes to low temperature direction, can make the further refinement of tissue, structure refinement is conducive to the improvement of low-temperature flexibility.In order to obtain the reasonably combined of strength and toughness, the present invention chooses Cr content range Cr0.10%-0.50%.
Cu, Ni: the intensity improving steel by solution strengthening effect, Cu can also improve the solidity to corrosion of steel simultaneously, and Ni adds the red brittleness mainly improved Cu and easily cause in steel, and useful to low-temperature flexibility.The water-cooled undercapacity caused because of the increase of thickness also can be compensated and the strength degradation caused in think gauge pipe line steel.The present invention chooses Cu0.10%-0.25%, Ni0.10%-0.30%.
P, S: be inevitable impurity element in steel, it is more low better to wish.For the consideration of smelting cost, again can not be unconfined low.Therefore, P, S upper content limit is set as 0.015% and 0.003% by the present invention.Be less than 30ppm by ultralow S() and Ca process inclusion morphology control is carried out to sulfide, pipe line steel can be made to have high impelling strength.
The present invention is directed to micro-alloy low-carbon bainite structure and there is high-intensity high-tenacity, with grain refining, phase transformation strengthening, based on the material reinforcement such as precipitation strength and dislocations strengthening theory, low-carbon (LC) be have employed to the Composition Design with bainite structure pipe line steel, super low sulfur, Nb, V, Ti combined microalloying, control the Cr alloying of tissue and suitably add Cu, the Composition Design of Ni, appropriate raising C content, strict control Mn content, in conjunction with hot rolling cooling controlling and rolling controlling process, obtaining by bainite+acicular ferrite is main tissue, to ensure that pipe line steel has higher intensity, toughness and cost is lower.
The operational path of the manufacture method of low-cost and high-performance pipe line steel of the present invention is as follows: get the raw materials ready → converter or electrosmelting → external refining → casting → slab reheat → controlled rolling → controlled cooling model.
Be characterized in that hot rolling technology controls as follows:
(1) slab heating temperature: 1100-1200 DEG C;
(2) temperature controlling range of recrystallization zone controlled rolling: 900-1150 DEG C;
(3) temperature controlling range of non-recrystallization zone controlled rolling: 700-950 DEG C;
(4) rolling temperature: 700-800 DEG C is stopped;
(5) cooling temperature: 350-450 DEG C is stopped
(6) speed of cooling: 10-25 DEG C/s
In order to ensure good obdurability coupling, two-stage control rolling technique is adopted in Plate Production process, wherein first stage rolling is recrystallization zone rolling, this stage, at least three passages completed more than 1000 DEG C, and single pass heavy deformation is not less than 25%, subordinate phase rolling is the rolling of non-recrystallization zone, and the cumulative deformation in this stage is not less than 60%, wherein has at least two passages to complete below 780 DEG C.After steel plate rolls in Cooling Process, the temperature range of specifying is adopted to coordinate corresponding speed of cooling.
Hot rolling technology of the present invention have employed the thermo-mechanical processi technology of controlled rolling and controlled cooling, the organizational controls of the finished product is carried out by reasonable component and technique, to obtain the low-carbon bainite tissue with high-intensity high-tenacity, made steel plate is made to reach the requirement of X80 pipeline steel.
Compared with existing sizable application X80, the performance of the pipe line steel produced according to technique scheme reaches following requirement:
(1) tensile property:
Target: Rt0.5 >=555MPa, Rm >=625MPa, yield tensile ratio Rt0.5/Rm≤0.90.
(2) v-notch impact property:
Target: test temperature-20 DEG C, the ballistic work mean value >=230J of 10mm × 10mm × 55mm sample, shear area monodrome >=80%, average >=90%.
(3) DWTT performance
Target: test temperature-15 DEG C, average shear area SA% >=85%, single SA% >=70%.
(4) transverse cold bending performance:
Target: d=2a is 180 °, intact.
Feature of the present invention is: (1), compared with pipe line steel composition in the past, rational formula aspect of the present invention is considered not add Mo, B, and strictly control Mn, Cu, Ni, Cr, Nb, V, Ti addition is to reduce costs; (2) it limits alloying element for feature with low-carbon (LC) control Mn, under proof strength prerequisite, adds impelling strength and good welding property, makes pipe line steel have good crack arrest ability; (3) relation of C and Nb element is taken full advantage of, make it to generate NbC under certain cooperation, produce refined crystalline strengthening effect, and utilize the raising recrystallization temperature of Nb to do in order to coordinate controlled rolling process, not only increase the over-all properties of product, and hot-rolled production process flexibly can be adopted, enhance productivity, reduce mill load, the product produced has higher impelling strength, can fully ensure high intensity and toughness, has good crack arrest ability; (4) for ensureing good obdurability coupling, adopting two benches controlled rolling process and having the lower limit of quantification to specify to the rolling pass in per stage, reduction in pass and accumulation draught.
The present invention and advantage and effect be: 1) reduce alloying element addition, reduce cost of alloy drop into, add profit space; 2) reduce alloying element addition, be that controlled rolling operation is efficient, low-alloy low-carbon-equivalent is conducive to reducing mill load.The present invention has the advantages such as cost is low, the good combination property of production efficiency, product.
Embodiment
Below in conjunction with specific embodiment, the present invention is elaborated
Table 1 ~ 3 are the embodiment 1-5 that press present component and form and the chemical composition of comparative example 6-8, processing parameter and results of property.Wherein comparative example 6 is from patent CN201110179963.9, and comparative example 7 is from CN201210327206.6, and comparative example 8 is from CN201210003018.8.
1. chemical composition
The chemical composition (wt%) of embodiment 1-5 and comparative example 6-8 is as table 1.
Table 1 chemical composition (wt%)
2. hot rolling technology
Operational path is as follows: get the raw materials ready → converter or electrosmelting → external refining → casting → slab reheat → controlled rolling → controlled cooling model.The processing parameter of embodiment 1-5 and comparative example 6-8 is in table 2.
Table 2 processing parameter
Note: * represents former patent and does not provide correlation parameter occurrence.
3. results of property
Carry out mechanics, Charpy impact, DWTT experiment respectively, the plate property test-results of embodiment 1-5 and comparative example 6-8 is as shown in table 3.The measurement sample that stretches in table is diameter 12.7mm pole sample.
Table 3 mechanical property result
Note: * represents former patent and does not provide correlation parameter occurrence.
Claims (3)
1. a low cost X80 pipeline steel, is characterized in that, the weight percent of chemical composition is: C0.065%-0.085%, Mn1.0%-2.0%, Si0.25%-0.35%, Cu0.10%-0.25%, Ni0.10%-0.30%, Cr0.10%-0.50%, Nb0.02%-0.04%, Ti0.005%-0.03%, V0.02%%-0.04%, Alt0.02-0.06%, Ca≤0.006%P≤0.015%, S≤0.003%, N≤0.012%, surplus is Fe and the inevitable impurity of trace.
2. a manufacture method for a kind of low cost X80 pipeline steel as claimed in claim 1, operational path is as follows: get the raw materials ready → converter or electrosmelting → external refining → casting → slab reheat → controlled rolling → controlled cooling model; It is characterized in that, concrete hot rolling technology controls as follows:
1) slab heating temperature: 1100-1200 DEG C;
2) adopt two-stage control rolling technique in Plate Production process, wherein first stage rolling is the temperature controlling range of recrystallization zone rolling, recrystallization zone controlled rolling: 900-1150 DEG C; The temperature controlling range of non-recrystallization zone controlled rolling: 700-950 DEG C;
3) rolling temperature: 700-800 DEG C is stopped;
4) cooling temperature: 350-450 DEG C is stopped;
5) speed of cooling: 10-25 DEG C/s.
3. the manufacture method of a kind of low cost X80 pipeline steel according to claim 2, it is characterized in that, adopt two-stage control rolling, first stage, at least three passages completed more than 1000 DEG C, and single pass heavy deformation is not less than 25%, subordinate phase has at least two passages to complete below 780 DEG C, and total cumulative deformation in this stage is not less than 60%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755868A (en) * | 2016-12-13 | 2017-05-31 | 钢铁研究总院 | A kind of low cost can Large Heat Input Welding high-strength and high ductility steel plate manufacture method |
| CN108330237A (en) * | 2017-09-27 | 2018-07-27 | 中能立化科技有限公司 | A kind of slag stream conveying device and slag granulating take hot systems |
| CN109517959A (en) * | 2018-12-17 | 2019-03-26 | 包头钢铁（集团）有限责任公司 | Effective hot rolled strip of a kind of low cost conveying and preparation method thereof |
| CN109957709A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | V-containing large-deformation X70M pipeline steel plate and manufacturing method thereof |
| CN112981254A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Wide high-strength high-toughness thick-wall X80M pipeline steel plate and manufacturing method thereof |
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- 2013-10-10 CN CN201310471192.XA patent/CN104561825A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106755868A (en) * | 2016-12-13 | 2017-05-31 | 钢铁研究总院 | A kind of low cost can Large Heat Input Welding high-strength and high ductility steel plate manufacture method |
| CN108330237A (en) * | 2017-09-27 | 2018-07-27 | 中能立化科技有限公司 | A kind of slag stream conveying device and slag granulating take hot systems |
| CN109957709A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | V-containing large-deformation X70M pipeline steel plate and manufacturing method thereof |
| CN109957709B (en) * | 2017-12-14 | 2020-07-17 | 鞍钢股份有限公司 | V-containing large-deformation X70M pipeline steel plate and manufacturing method thereof |
| CN109517959A (en) * | 2018-12-17 | 2019-03-26 | 包头钢铁（集团）有限责任公司 | Effective hot rolled strip of a kind of low cost conveying and preparation method thereof |
| CN112981254A (en) * | 2021-02-09 | 2021-06-18 | 鞍钢股份有限公司 | Wide high-strength high-toughness thick-wall X80M pipeline steel plate and manufacturing method thereof |
| CN112981254B (en) * | 2021-02-09 | 2022-03-22 | 鞍钢股份有限公司 | Wide high-strength high-toughness thick-wall X80M pipeline steel plate and manufacturing method thereof |
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