CN102534408A - X80 pipeline steel coil with low cost and high toughness and production method thereof - Google Patents
X80 pipeline steel coil with low cost and high toughness and production method thereof Download PDFInfo
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- CN102534408A CN102534408A CN201210022461XA CN201210022461A CN102534408A CN 102534408 A CN102534408 A CN 102534408A CN 201210022461X A CN201210022461X A CN 201210022461XA CN 201210022461 A CN201210022461 A CN 201210022461A CN 102534408 A CN102534408 A CN 102534408A
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Abstract
The invention relates to an X80 pipeline steel coil with low cost and high toughness and a production method thereof, belonging to the technical field of low-alloy steel. The X80 pipeline steel coil comprises the following chemical components by percent: 0.03-0.07 percent of C, 0.10-0.25 percent of Si, 1.25-1.95 percent of Mn, at most 0.018 percent of P, at most 0.005 percent of S, 0.06-0.12 percent of Nb, 0.15-0.30 percent of Mo, 0.008-0.020 percent of Ti, 0.15-0.35 percent of Cr, 0.020-0.045 percent of Als, 0.0015-0.0035 percent of Ca, at most 0.0060 percent of N and the balance of Fe and inevitable impurities. The X80 pipeline steel coil disclosed by the invention has the advantages of simple component design and low production cost, and a lot of precious metal resources are saved. Meanwhile, the X80 pipeline steel coil has higher mechanical property and good impact toughness and has a wide market promotion prospect.
Description
Technical field
The present invention relates to a kind of high strength and low cost toughness X80 pipe line steel roll bending and working method thereof, belong to the low alloy steel technical field.
Background technology
X80 is the branch style number of high-strength line-pipe steel.The heavy caliber Welded Steel Pipe of transfer oil, Sweet natural gas etc. is processed with line steel hot rolling roll bending or Wide and Thick Slab, 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, Natural Gas Demand amount, for its transfer pressure of transport efficiency and the caliber that increases pipeline also constantly increases.Consider the structural stability and the security of pipeline, also need increase thickness of pipe and the intensity that improves tubing, therefore develop towards thick specification and HS direction as the pipeline steel capital of this type transfer lime.At the beginning of 2008, the longest transnational natural gas line transfering natural gas from the west to the east two wires engineering in the world formally goes into operation, and its main line has mainly adopted 18.4 * 1550mm specification X80 line steel hot rolling roll bending.In order to obtain preferable performance, at present, generally adopt the method that adds a large amount of valuable alloying elements (for example niobium, molybdenum, copper, nickel etc.), not only expended a large amount of noble metal resources, also increased the production cost of X80 pipe line steel roll bending greatly.In the background technology, Chinese patent CN 1715434A, name is called high-intensity high-tenacity X80 pipe line steel and hot rolled plate making process thereof; Its alloying element content is very high; For example the Mo constituent content 0.32%, Cu constituent content 0.24%, Ni constituent content 0.27% etc.; And its thickness specification is thinner, and maximum ga(u)ge is not more than 14.6mm; Chinese patent CN 101413090A, name is called a kind of high-strength high-toughness X 80 hot rolling coiled sheet for spiral buried arc welding and working method thereof, and its alloying element content is higher; For example the Mo constituent content 0.24%; Cu constituent content 0.24%, Ni constituent content 0.24%, production cost are very high; Chinese patent CN 102021497A, name is called a kind of X80 line steel hot rolling coiled sheet and method of manufacture thereof, though the X80 chemical ingredients is optimized, its alloying element content is still higher, for example the Cu constituent content 0.19%, Ni constituent content 0.19% etc.
Summary of the invention
The object of the invention provides a kind of high strength and low cost toughness X80 pipe line steel roll bending and working method thereof; On assurance material each item performance meets the specification the basis that requires; Realize low cost, thick specification, high-strong toughness; Can produce the thick X80 pipe line steel of 17-18.5mm, improve the economic and social benefits, solve the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of high strength and low cost toughness X80 pipe line steel roll bending, its chemical ingredients is following according to the weight percent proportioning: C 0.03%～0.07%, and Si 0.10%～0.25%, and Mn 1.25%～1.95%; P≤0.018%, S≤0.005%, Nb 0.06%～0.12%, and Mo 0.15%～0.30%; Ti 0.008%～0.020%, and Cr 0.15%～0.35%, and Als 0.020%～0.045%; Ca 0.0015%～0.0035%, N≤0.0060%, and surplus is iron and unavoidable impurities.
The mechanism of action of its principal element is following:
Carbon: the principal element that influences pipe line steel obdurability, weldableness.Carbon content increases, and weldableness worsens, and toughness descends, the aggravation of segregation simultaneously, anti-HIC ability drop.Along with the raising of the intensity rank of steel, the carbon content in the pipe line steel is downward trend gradually, and X80 pipe line steel carbon content generally is controlled in 0.02～0.08% scope.
Manganese:, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the pipe line steel because of carbon content through the intensity of solution strengthening raising steel.Manganese still enlarges the element of γ phase region, can reduce γ → α transformation temperature, helps to obtain tiny phase-change product, can improve toughness, the reduction ductile-brittle transition temperature of steel.The manganese content of X80 pipe line steel generally is controlled at below 2.0%.
Niobium: can produce the grain refining of highly significant and moderate precipitation strength effect.Separate out the austenitic answer of obstruction deformation, recrystallize through the carbon of niobium in the course of hot rolling, the strain inducing of nitride;, controlled rolling and controlled chilling change tiny ferritic when making the rolling deformed austenite in non-recrystallization zone of finish rolling stage be organized in phase transformation into; To improve the intensity and the toughness of steel; And can improve low-temperature flexibility
Titanium: be strong solid N element, can form tiny stable TiN precipitated phase, austenite crystal was grown up when it can effectively hinder the slab reheat, helped to improve the solid solubility of Nb in austenite, simultaneously the impelling strength of improving welded heat affecting zone was had obvious effect.
Molybdenum: can reduce γ-α transformation temperature, suppress the formation of polygonal ferrite (PF), promote the transformation of acicular ferrite (AF), and improve the precipitation strength effect of Nb (C, N), improve the intensity and the fracture toughness property of steel, reduce yield tensile ratio.
Chromium: can effectively improve hardening capacity, suppress polygonal ferrite and pearlitic generation, promote in middle gentle cold zone, to form the acicular ferrite that intracrystalline has a large amount of dislocations to distribute.
The low-cost thick size high-tensile toughness X80 pipe line steel roll bending composition design philosophy of the present invention is the composition design with low-carbon (LC), Gao Meng; Niobium, titanium alloy through adding trace improve intensity; Add an amount of Chrome metal powder to reduce expensive molybdenum alloy content; Combine hot rolling TMCP technology to obtain acicular ferrite type tissue simultaneously, have high-strong toughness to guarantee thick specification X80 pipe line steel roll bending.
A kind of working method of high strength and low cost toughness X80 pipe line steel roll bending; Comprise hot metal pretreatment, converter smelting, external refining, continuous casting, strand heating, controlled rolling, controlled chilling and low temperature coiling process, controlled rolling, controlled chilling and low temperature coiling process are controlled as follows: (1) slab heating temperature: 1150～1250 ℃; Rough rolling step final temperature: 950～1050 ℃; Intermediate blank thickness: 57～62mm; Finish rolling stage final temperature: 750～850 ℃; Coiling temperature: 300～450 ℃; Rate of cooling: 15～30 ℃/s.
Positively effect of the present invention: (1) design of alloy is simple relatively; Copper, nickelalloy have been removed; Through adding the relatively cheap chromium of alloy price to reduce expensive molybdenum content, practiced thrift a large amount of noble metal resources like this, greatly reduce the production cost of X80 pipe line steel; (2) the present invention can obtain typical acicular ferrite type tissue, has higher intensity and good low-temperature flexibility.Its ys is greater than 575MPa, and tensile strength is greater than 665MPa, and its-20 ℃ of ballistic works are greater than 285J, and-15 ℃ of shear area of dropping hammer reach more than 95%; (3) give full play to the equipment advantage, improve each passage accumulation draft of finish rolling stage and adopt that low temperature batches and wait technological measure, with the lower higher intensity of alloying element content acquisition.
The X80 line steel hot rolling roll bending performance of producing according to technique scheme has reached following requirement:
(1) mechanical property: Rt
0.5=575～605MPa, R
m=665～710MPa, Rt
0.5/ R
m＜0.90, A＞21%; (2) v-notch impact property: experimental temperature-20 ℃, the ballistic work MV of 10 * 10 * 55mm sample be greater than 285J, shear area 100%; (3) DWTT performance: experimental temperature-15 ℃, shear area is greater than 95%; (4) horizontal cold-bending property: d=2a is 180 °, intact; (5) experiment of hardness: HV
10≤245; (6) metallographic structure: acicular ferrite type tissue.
Embodiment
Below, the present invention is described further through specific embodiment.
A kind of working method of high strength and low cost toughness X80 pipe line steel roll bending; Comprise hot metal pretreatment, converter smelting, external refining, continuous casting, strand heating, controlled rolling, controlled chilling and low temperature coiling process, controlled rolling, controlled chilling and low temperature coiling process are controlled as follows: (1) slab heating temperature: 1150～1250 ℃; Rough rolling step final temperature: 950～1050 ℃; Intermediate blank thickness: 57～62mm; Finish rolling stage final temperature: 750～850 ℃; Coiling temperature: 300～450 ℃; Rate of cooling: 15～30 ℃/s.
Converter smelting, external refining control operation inhibition and generation composition are following according to weight percent: C 0.03%～0.07%, and Si 0.10%～0.25%, and Mn 1.25%～1.95%, P≤0.018%; S≤0.005%, Nb 0.06%～0.12%, and Mo 0.15%～0.30%; Ti 0.008%～0.020%, and Cr 0.15%～0.35%, and Als 0.020%～0.045%; Ca 0.0015%～0.0035%, N≤0.0060%, and surplus is iron and unavoidable impurities.
Among the embodiment, product specification is 18.4mm * 1550mm * C.
The chemical ingredients of various embodiments of the present invention is seen table 1; Controlled rolling, controlled chilling and low temperature coiling process situation are seen table 2, and its service check result sees table 3, and metallographic examination is acicular ferrite type tissue, and grain fineness number is 13.6 grades.
Can find out through above embodiment, with compared with techniques in the past, X80 pipe line steel roll bending composition simplicity of design of the present invention; Production cost is low; Practiced thrift a large amount of noble metal resources, also had higher mechanical property and good impelling strength simultaneously, marketing has a extensive future.
Claims (3)
1. high strength and low cost toughness X80 pipe line steel roll bending, it is characterized in that chemical ingredients is following according to the weight percent proportioning: C 0.03%～0.07%, and Si 0.10%～0.25%, and Mn 1.25%～1.95%; P≤0.018%, S≤0.005%, Nb 0.06%～0.12%, and Mo 0.15%～0.30%; Ti 0.008%～0.020%, and Cr 0.15%～0.35%, and Als 0.020%～0.045%; Ca 0.0015%～0.0035%, N≤0.0060%, and surplus is iron and unavoidable impurities.
2. the working method of a high strength and low cost toughness X80 pipe line steel roll bending; Comprise hot metal pretreatment, converter smelting, external refining, continuous casting, strand heating, controlled rolling, controlled chilling and low temperature coiling process, it is characterized in that controlled rolling, controlled chilling and low temperature coiling process control as follows: (1) slab heating temperature: 1150～1250 ℃; Rough rolling step final temperature: 950～1050 ℃; Intermediate blank thickness: 57～62mm; Finish rolling stage final temperature: 750～850 ℃; Coiling temperature: 300～450 ℃; Rate of cooling: 15～30 ℃/s.
3. the working method of a kind of high strength and low cost toughness X80 pipe line steel roll bending according to claim 2, it is characterized in that converter smelting, external refining control operation inhibition and generation composition are following according to weight percent: C 0.03%～0.07%, and Si 0.10%～0.25%; Mn 1.25%～1.95%, P≤0.018%, S≤0.005%; Nb 0.06%～0.12%, and Mo 0.15%～0.30%, and Ti 0.008%～0.020%; Cr 0.15%～0.35%, and Als 0.020%～0.045%, and Ca 0.0015%～0.0035%; N≤0.0060%, surplus are iron and unavoidable impurities.
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| CN201210022461XA CN102534408A (en) | 2012-02-01 | 2012-02-01 | X80 pipeline steel coil with low cost and high toughness and production method thereof |
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| CN201210022461XA CN102534408A (en) | 2012-02-01 | 2012-02-01 | X80 pipeline steel coil with low cost and high toughness and production method thereof |
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| CN102534408A true CN102534408A (en) | 2012-07-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
| CN104357749A (en) * | 2014-11-14 | 2015-02-18 | 武汉钢铁(集团)公司 | High-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes and production method thereof |
| CN109576467A (en) * | 2019-01-08 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | Improve the control method of the logical volume performance uniformity of low-alloy high-strength steel containing Nb |
| CN109680135A (en) * | 2019-02-19 | 2019-04-26 | 武汉钢铁有限公司 | A kind of pipeline X80 hot-rolled coil and the production method of thickness >=22mm |
| CN109957712A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method |
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| CN101649415A (en) * | 2008-08-12 | 2010-02-17 | 株式会社神户制钢所 | High-strength steel sheet superior in formability |
| CN101705438A (en) * | 2009-11-13 | 2010-05-12 | 首钢总公司 | X70 hot-rolled steel coil for pipeline steel and manufacturing method thereof |
| CN101928881A (en) * | 2009-06-26 | 2010-12-29 | 宝山钢铁股份有限公司 | Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof |
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2012
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649415A (en) * | 2008-08-12 | 2010-02-17 | 株式会社神户制钢所 | High-strength steel sheet superior in formability |
| CN101928881A (en) * | 2009-06-26 | 2010-12-29 | 宝山钢铁股份有限公司 | Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof |
| CN101705438A (en) * | 2009-11-13 | 2010-05-12 | 首钢总公司 | X70 hot-rolled steel coil for pipeline steel and manufacturing method thereof |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602913A (en) * | 2013-12-10 | 2014-02-26 | 武汉钢铁(集团)公司 | X80 steel hot-rolled plate coil for natural gas pipelines and preparation method thereof |
| CN103602913B (en) * | 2013-12-10 | 2016-04-13 | 武汉钢铁(集团)公司 | For the X80 steel hot-rolled sheet coil and preparation method thereof of natural gas line |
| CN104357749A (en) * | 2014-11-14 | 2015-02-18 | 武汉钢铁(集团)公司 | High-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes and production method thereof |
| CN109957712A (en) * | 2017-12-14 | 2019-07-02 | 鞍钢股份有限公司 | A kind of soft X70M line steel hot rolling coiled sheet and its manufacturing method |
| CN109957712B (en) * | 2017-12-14 | 2020-09-01 | 鞍钢股份有限公司 | Low-hardness X70M pipeline steel hot-rolled plate coil and manufacturing method thereof |
| CN109576467A (en) * | 2019-01-08 | 2019-04-05 | 邯郸钢铁集团有限责任公司 | Improve the control method of the logical volume performance uniformity of low-alloy high-strength steel containing Nb |
| CN109576467B (en) * | 2019-01-08 | 2021-03-09 | 邯郸钢铁集团有限责任公司 | Control method for improving uniformity of coiling performance of Nb-containing low-alloy high-strength steel |
| CN109680135A (en) * | 2019-02-19 | 2019-04-26 | 武汉钢铁有限公司 | A kind of pipeline X80 hot-rolled coil and the production method of thickness >=22mm |
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Application publication date: 20120704 |