CN102021497A - X80 pipeline steel hot-rolled plate coil and manufacturing method thereof - Google Patents
X80 pipeline steel hot-rolled plate coil and manufacturing method thereof Download PDFInfo
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- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 42
- 238000009749 continuous casting Methods 0.000 claims abstract description 32
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 11
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 230000035945 sensitivity Effects 0.000 claims abstract description 6
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
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- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 3
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 23
- 238000005098 hot rolling Methods 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 5
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- 239000011733 molybdenum Substances 0.000 description 7
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
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Abstract
The invention discloses an X80 pipeline steel hot-rolled plate coil and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by weight: 0.02 to 0.06 percent of C, 0.05 to 0.35 percent of Si, 1.70 to 1.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, 0.20 to 0.35 percent of Cr, 0.06 to 0.15 percent of Mo, 0.06 to 0.11 percent of Nb, less than or equal to 0.08 percent of V, less than or equal to 0.20 percent of Ni, less than or equal to 0.25 percent of Cu, 0.005 to 0.025 percent of Ti, 0.015 to 0.045 percent of Als, 0.001 to 0.004 percent of Ca0.006 percent of N, the balance of Fe and inevitable impurities, and the cold crack sensitivity coefficient Pcm is less than or equal to 0.. The manufacturing method comprises the following steps: the continuous casting slab is directly hot-charged at 850 ℃ of 500-. The invention adopts the hot charging rolling technology, improves the heat energy use efficiency, saves energy, shortens the production period, improves the production efficiency and greatly reduces the production cost.
Description
Technical field
The invention belongs to the manufacturing field of high-strength low-alloy steel, be specifically related to a kind of X80 pipe line steel and manufacture method thereof, particularly relate to a kind of manufacturing spiral submerged arc welded steel pipe X80 line steel hot rolling roll bending and manufacture method thereof in the API SPEC 5L standard.
Background technology
Pipe-line transportation is long most economical, safe apart from transfer oil, Sweet natural gas, efficiently and environmental transportation method, and along with optimizing and revising of global energy structure, oil, natural gas energy resource demand increase day by day, have stimulated the fast development of pipe-line construction.
For reducing pipe-line construction and operation cost, improve transport efficiency, long-distance transport pipes are to adopting high grade of steel, high pressure, heavy caliber to carry development to become the main flow trend of pipe-line construction, the development and the development of high-grade pipe line steel have been promoted, the X70-X80 pipe line steel of taking into account high strength and high tenacity has become the main flow grade of steel of international long-distance transport pipes engineering, especially the nearly 8000km main line of China's transfering natural gas from the west to the east two wires engineering all adopts the X80 grade of steel, and market outlook are extensive.
Oil, the natural-gas transfer pipeline engineering of world's overwhelming majority of countries are all followed API API SPEC 5L standard with the pipe line steel steel pipe at present, heavy caliber transport pipe engineering steel pipe is divided into spiral submerged arc welded steel pipe and longitudinal submerged arc welded pipe by the tubulation mode, and corresponding two kinds of raw materials that welded tube adopted are respectively hot-rolled sheet coil and hot-rolled steel sheet.
Adopt high pressure, heavy caliber, long needs for satisfying, require pipe line steel to take into account high strength, good low-temperature toughness and good welds performance etc. simultaneously, so the X80 pipe line steel generally adopts acicular ferrite structure's design apart from the line of pipes engineering.
Before the present invention, the patent of invention of a plurality of relevant X80 pipe line steels has been arranged, the patent of invention comparatively approaching with the present invention has: 1) Chinese patent, publication number CN 1715434A, " high-intensity high-tenacity X80 pipe line steel and hot-rolled coil manufacture method thereof "; 2) Chinese patent, publication number CN 101270441A, " a kind of economy type X 80 pipeline steel and production method thereof "; 3) Chinese patent, publication number CN 1715434A, " having anti-HIC performance X80 pipe line steel and hot rolled plate making process thereof ", 4) Japanese Patent, publication number JP 2004269964, " manufacture method of high tensile steel plate "; 5) Japanese Patent, publication number JP 11080833, " the effective steel plate manufacture method of high-strength steel " with good anti-HIC performance; 6) Japanese Patent, publication number JP 10102184, " making the high-strength electric resistance welded steel pipe hot-rolled steel sheet ".Wherein 3 Japanese Patents are and make the patent of invention of straight weld steel pipe with the X80 hot-rolled steel sheet, and are different with product of the present invention.And 3 Chinese patents and product of the present invention are the most approaching, are to make the patent of invention of spiral submerged arc welded steel pipe with the X80 hot-rolled sheet coil.
The disclosed X80 pipe line steel of above patent documentation has reached high strength and high tenacity etc., but continuous casting steel billet adopts the 250mm heavy slab, the slab finishing of need rolling off the production line before the continuously cast bloom reheat, and heat-energy losses is bigger, and the production cycle is longer, the production cost height.Thinner thickness, the thickest specification of the open X80 hot-rolled sheet coil of patent documentation are 15mm simultaneously, are difficult to satisfy the needs of high pressure, heavy caliber, heavy wall long distance pipeline engineering steel.
Summary of the invention
The object of the present invention is to provide a kind of adopt intermediate gauge slab continuous casting rolling production technique, economically manufacture thick specification X80 line steel hot rolling coiled sheet and manufacture method.Solve the design of prior art interalloy and add valuable alloying element, and adopt thick specification continuous casting steel billet in the manufacturing processed, the slab finishing of need rolling off the production line before the continuously cast bloom reheat, heat-energy losses is bigger, the production cycle is longer, and problems such as production cost height.
For solving problems of the prior art, particularly continuous casting steel billet adopts the finishing of need rolling off the production line of heavy slab, continuously cast bloom, production cost height, and the thinner thickness of hot-rolled sheet coil is difficult to satisfy the problems such as needs of long distance pipeline engineering steel, special proposition technical scheme of the present invention.
One of technical scheme of the present invention is, a kind of low molybdenum X80 pipe line steel of low-carbon (LC) with acicular ferrite structure is proposed, the weight percent of its chemical ingredients (%) is: C 0.02%-0.06%, Si 0.05%-0.35%, Mn 1.70%-1.90%, P≤0.015%, S≤0.004%, Cr 0.20%-0.35%, Mo 0.06%-0.15%, Nb 0.06%-0.11%, V≤0.08%, Ni≤0.20%, Cu≤0.25%, Ti0.005%-0.025%, Als 0.015%-0.045%, Ca 0.001%-0.004%, N≤0.006%, surplus is Fe and inevitable impurity, and cold crack sensitivity coefficient Pcm≤0.21%.
The composition design philosophy of low molybdenum X80 pipe line steel is with low C, high Mn, high Nb, by microalloy element, a small amount of Cr and Cu, Ni, Mo alloying elements such as adding trace Tis, linkage heat machinery controlled rolling production technique obtains tiny acicular ferrite structure, to guarantee that pipe line steel has the performance of high-intensity high-tenacity, the selection of its principal element be the reasons are as follows:
C: carbon is carbide forming element, is most economical, the most effective substantially strengthening element in the steel, by solution strengthening and precipitation strength the intensity that improves steel is had obvious effect, but improve carbon content the impelling strength and the welding property of product is had negative impact.Carbon content of the present invention is 0.02%-0.06%, and low-carbon (LC) guarantees that pipe line steel has good low-temperature toughness, good welds performance and anti-hydrogen induced cracking (HIC) performance.
Mn: manganese has the solution strengthening effect, also can reduce γ-α transformation temperature, and then the refinement ferrite crystal grain, compensates the main and most economical strengthening element because of C content reduction causing loss of strength simultaneously.Manganese content of the present invention is 1.70%-1.90%, and high manganese promotes acicular ferrite nucleating, and high Mn/C can improve steel yield strength and impelling strength, reduces ductile-brittle transition temperature, and the refinement carbonitride is separated out size, promotes the precipitation strength effect.
Nb: be one of topmost element in the modern microalloying pipe line steel, fairly obvious to the effect of grain refining.High niobium can postpone austenite recrystallization, reduces transformation temperature, promotes the formation on acicular ferrite structure and M-A island.Obtain high strength, high tenacity performance by mechanism such as solution strengthening, phase transformation strengthening, precipitation strengths.Content of niobium of the present invention is 0.06%-0.11%.
Mo: molybdenum can effectively improve hardening capacity, the expansion γ phase region of steel, have reduction γ-α transformation temperature, suppress the formation of polygonal ferrite (PF), promote the transformation of acicular ferrite (AF), and the precipitation strength effect of raising Nb (C, N), the intensity and the fracture toughness property of raising steel.But molybdenum is more valuable, reduce its content under the prerequisite that does not influence performance as far as possible.Molybdenum content of the present invention is 0.06%-0.15%.
Cr: chromium can effectively improve hardening capacity, suppresses polygonal ferrite and pearlitic generation, promotes to form in middle gentle cold zone ferrite or the bainite that intracrystalline has a large amount of dislocations to distribute.Be used in combination with Mo, its effect is more remarkable.Chromium content of the present invention is 0.20%-0.35%.
Ti: titanium is strong nitrogen killer, and the stoichiometric ratio of Ti/N is 3.42.When adding 0.015% left and right sides Ti, can when sheet billet continuous casting, form the tiny TiN precipitated phase of high-temperature stable, this precipitated phase can effectively stop continuously cast bloom the growing up of austenite crystal in heat-processed, and the fracture toughness property of heat affected zone has obvious effect when improving the steel welding simultaneously.Ti content of the present invention is controlled at 0.005%～0.025%.
Cu, Ni: copper nickel can improve the intensity of steel by the solution strengthening effect.Cu can also improve the solidity to corrosion of steel, and adding Ni simultaneously mainly is to improve the red brittleness that Cu easily causes in steel, and useful to toughness.
Pcm: control cold crack sensitivity coefficient helps ensureing the welding property of product, and Pcm of the present invention is controlled at 0.15%～0.20%.
Two of technical scheme of the present invention is to propose a kind of manufacture method that adopts intermediate gauge slab continuous casting rolling production technique to manufacture thick specification X80 line steel hot rolling roll bending economically.Its technological process of production relates to: hot metal pretreatment-converter smelting-external refining (processing of RH+LF+ calcium)-continuous casting-slab heating-rolling-laminar flow cools off-batches.It is characterized in that:
1) smelts continuous casting process: hot metal pretreatment, converter smelting---through top blast or top bottom blowing, external refining---through the RH vacuum-treat, the frivolous sulphuring treatment of LF stove and carry out calcium and handle with the control inclusion morphology and improve the ductility of steel, toughness and cold-bending property, sheet billet continuous casting is made continuous casting steel billet---and continuous casting adopts induction stirring or dynamically gently depresses, to improve the quality of continuous casting steel billet, use the thick continuously cast bloom of 170mm, obviously be thinner than the main at present thick continuously cast bloom of using in the 250mm left and right sides both at home and abroad, it solidifies rate of cooling and is far longer than traditional heavy slab, and secondary dendrite arm spacing reduces significantly.
2) rolling technology: continuous casting steel billet directly carries out the heating of hot charging stove 500-850 ℃ of temperature, continuous casting steel billet is heated to 1150-1250 ℃ through walking beam furnace and comes out of the stove, with after roughing and finishing train two stages controlled rolling, the finishing temperature of roughing is 1030-970 ℃, the finishing temperature of finish rolling is 750-850 ℃, the compression ratio of finish rolling is greater than 60%, and coiled sheet adopts the laminar flow type of cooling to cool off fast with the speed of 10-25 ℃/s subsequently, batches 450-580 ℃ of temperature.
Adopt the present invention to produce above-mentioned thick specification X80 hot-rolled sheet coil, can be made into the spiral submerged arc welded steel pipe.Press API 5L standard code, above-mentioned X80 grade of steel body yield strength is 555-705MPa, tensile strength 625-825MPa, elongation 〉=16%,-20 ℃ of Charpy-V impact powers (3 sample means) Akv 〉=240J ,-15 ℃ of Drop-Weight Tear Test (DWTT) shear area (2 sample means) 〉=85%.
The special feature of technical solution of the present invention is: 1) adopt the thickness of continuous casting steel billet only to be 170mm; 2) hot-rolled coil of Zhi Zaoing is special thick specification, and the thickest specification can reach 18.4mm.3) adopt short flow process continuous casting and rolling process for production; 4) continuous casting technology and zero defect sheet billet continuous casting technology are dynamically gently depressed in employing on the continuous casting process, and continuous casting steel billet need not the finishing of rolling off the production line; 5) adopt the hot charge rolling technology on the rolling technology, continuous casting steel billet can directly carry out the hot charging stove 500-850 ℃ of temperature, has improved the heat energy service efficiency and has saved the energy, shortens the production cycle, enhances productivity, and reduces production costs greatly.
1) the low molybdenum C-Mn-Cr-Mo-Nb of X80 line steel hot rolling coiled sheet employing of the present invention is acicular ferrite structure's design, molybdenum content is not more than 0.15%, can select to add alloying elements such as V, Ni and Cu, do not add the B alloying element, cost of alloy is moderate, and product reaches the requirement of API SPEC 5L code requirement X80 pipe line steel.
2) the present invention adopts the thick continuously cast bloom of 170mm, produces thick specification X80 line steel hot rolling roll bending at short flow process continuous casting continuous casting line, and the thickest specification can reach 18.4mm.
3) continuous casting technology and the zero defect sheet billet continuous casting technology dynamically gently depressed adopted in X80 pipe line steel manufacturing of the present invention, continuous casting steel billet need not the finishing of rolling off the production line, continuous casting steel billet can directly carry out hot charging stove reheat 500-850 ℃ of temperature, improve the heat energy service efficiency and saved the energy, shorten the production cycle, enhance productivity, reduce production costs greatly.
4) X80 pipe line steel of the present invention has good comprehensive toughness and tenacity: high strength---satisfy APISPEC 5L code requirement; Greater than 85%, the shear area of-15 ℃ of Drop-Weight Tear Test (DWTT) is greater than 85% greater than 300J, shear area for good low temperature fracture toughness----20 ℃ of Charpy-V impact powers.
5) X80 pipe line steel of the present invention has good welding property, and its cold crack sensitivity coefficient Pcm is not more than 0.21%, recommends to use rational welding material and weldprocedure, can obtain good welding property.
Embodiment
Enumerate embodiments of the invention below, these embodiment are only to the description of best mode for carrying out the invention, but scope of the present invention are not had any restriction.Table 1 is the chemical ingredients of test steel, and its technical process is that hot metal pretreatment-converter smelting-external refining (processing of RH+LF+ calcium)-continuous casting-slab heating-rolling-laminar flow cools off-batches, and the concrete process system of test steel sees Table 2.Table 3 is the mechanical property of test steel.
Table 1 embodiment test steel chemical composition (wt, %)
| Classification | C | Si | Mn | P | S | Als | Cu | Ni | Cr | Mo | V | Nb | Ti | N | Ca | Pcm |
| Example 1 | 0.051 | 0.25 | 1.87 | 0.014 | 0.002 | 0.029 | 0.20 | 0.19 | 0.29 | 0.12 | - | 0.090 | 0.012 | 0.003 | 0.0011 | 0.189 |
| Example 2 | 0.048 | 0.19 | 1.81 | 0.011 | 0.001 | 0.028 | 0.19 | 0.18 | 0.30 | 0.09 | - | 0.100 | 0.008 | 0.003 | 0.0012 | 0.178 |
| Example 3 | 0.041 | 0.15 | 1.82 | 0.013 | 0.001 | 0.027 | 0.17 | 0.15 | 0.25 | 0.10 | 0.03 | 0.080 | 0.009 | 0.004 | 0.0015 | 0.169 |
| Example 4 | 0.037 | 0.24 | 1.86 | 0.015 | 0.003 | 0.026 | 0.18 | 0.16 | 0.30 | 0.09 | - | 0.095 | 0.011 | 0.003 | 0.0022 | 0.171 |
| Example 5 | 0.035 | 0.11 | 1.75 | 0.014 | 0.002 | 0.022 | 0.18 | 0.17 | 0.30 | 0.10 | - | 0.090 | 0.009 | 0.004 | 0.0027 | 0.160 |
| Example 6 | 0.055 | 0.29 | 1.83 | 0.009 | 0.001 | 0.032 | - | - | 0.28 | 0.11 | - | 0.085 | 0.015 | 0.004 | 0.0020 | 0.178 |
Annotate: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
Table 2 embodiment tests the steel process system
Table 3 embodiment tests steel mechanical property
Annotate: the sampling direction of tension test, Charpy impact test and Drop-Weight Tear Test (DWTT) (DWTT) sample becomes 30 ° of directions with rolling direction.
By table 3 as seen, the present invention produces X80 line steel hot rolling coiled sheet, has good comprehensive mechanical properties and welding property, can be used to make the heavy caliber X80 grade of steel steel pipe that satisfies API SPEC 5L standard-required.
Claims (4)
1. X80 line steel hot rolling coiled sheet, the weight percent that it is characterized in that chemical ingredients is: C0.02%-0.06%, Si 0.05%-0.35%, Mn 1.70%-1.90%, P≤0.015%, S≤0.004%, Cr 0.20%-0.35%, Mo 0.06%-0.15%, Nb 0.06%-0.11%, V≤0.08%, Ni≤0.20%, Cu≤0.25%, Ti 0.005%-0.025%, Als 0.015%-0.045%, Ca 0.001%-0.004%, N≤0.006%, surplus is Fe and inevitable impurity, and cold crack sensitivity coefficient Pcm≤0.21%.
2. X80 line steel hot rolling coiled sheet according to claim 1 is characterized in that cold crack sensitivity coefficient Pcm is controlled at 0.15%～0.20%.
3. manufacture method that is used for claim 1 or 2 described X80 line steel hot rolling coiled sheets, comprise hot metal pretreatment, converter smelting, external refining, continuous casting, the slab heating, rolling, the laminar flow cooling, batch, it is characterized in that continuous casting steel billet directly carries out the heating of hot charging stove at 500-850 ℃, continuous casting steel billet is heated to 1150-1250 ℃ through walking beam furnace and comes out of the stove, with after roughing and finishing train two stages controlled rolling, the finishing temperature of roughing is 1030-970 ℃, the finishing temperature of finish rolling is 750-850 ℃, the compression ratio of finish rolling is greater than 60%, coiled sheet adopts the laminar flow type of cooling to cool off fast with the speed of 10-25 ℃/s subsequently, batches at 450-580 ℃.
4. the manufacture method of X80 line steel hot rolling coiled sheet according to claim 3 is characterized in that continuous casting adopts induction stirring or dynamically gently depresses, and continuous casting steel billet thickness is 170mm.
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2009
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Application publication date: 20110420 |