CN101519752A - High strength and toughness pipeline steel roll in low-carbon and high-niobium-chromium system and preparation method thereof - Google Patents
High strength and toughness pipeline steel roll in low-carbon and high-niobium-chromium system and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high strength and rigidity pipeline steel roll in a low-carbon and high-niobium-chromium system and a preparation method thereof. The chemical ingredients of the pipeline steel roll are as follows: 0.01 to 0.06 weight percentage of C, 0.10 to 0.40 weight percentage of Si, 1.0 to 1.80 weight percentages of Mn, at most 0.018 weight percentage of P, at most 0.004 weight percentage of S, 0.005 to 0.030 weight percentage of Ti, 0.08 to 0.18 weight percentage of Nb, at most 0.30 weight percentage of Cu, 0.08 to 0.20 weight percentage of Mo, 0.10 to 0.35 weight percentage of Cr, 0.01 to 0.06 weight percentage of Al and 0.002 to 0.008 weight percentage of N, and the residue of Fe and unavoidable impurities. The preparation method of the pipeline steel roll includes metal smelting according to an ultra-pure steel technology, melting-iron deep desulfurization, top and bottom composite blowing of a converter, ladle argon-blowing refining, vacuum treatment, the pouring of plate blanks from 200 mm to 300 mm and the technology of rolling and cooling control treatment of a hot continuous rolling mill. In the technology of rolling and cooling control treatment of a hot continuous rolling mill, the fine-final rolling temperature is controlled at 720 DEG C to 840 DEG C, and the curling temperature is controlled at 400 DEG C to 580 DEG C. The steel satisfies the yield strength (Rt0.5) which is not lower than 530 MPa, the -20 DEG C A(KV) which is not lower than 240 J, and the -10 DEG C DWTT SA which is not lower than 90 percent. The steel is made from low-price metal element and is particularly suitable for screw-embedded arc-welding pipes for manufacturing the petrol and natural gas pipeline engineering.
Description
Technical field
The present invention relates to the manufacturing field of microalloyed steel, be meant a kind of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll and manufacture method thereof especially.Can produce the spiral shell submerged-arc welded (SAW) pipe that is adapted to the oil and gas pipeline engineering with this pipe line steel.
Background technology
Along with high speed development of national economy, the situation that supply falls short of demand appears in the oil and gas demand, and this has greatly promoted the development of pipe-line transportation and high grade pipe line steel.From the situation of at present external pipe engineering with steel, high grade of steel pipe line steel has progressively become leading force, and X70 level steel pipe consumption has accounted for the pneumatic tube first place over nearly 10 years, and continues to develop to higher category.
The pipe line steel of existing X70 level or higher category adopts molybdenum (Mo) to belong to as main reinforcement unit usually, as the patent No. " acicular ferrite type X70 pipe line steel and the manufacture method thereof " put down in writing in 200410066297.8 the Chinese invention patent specification sheets with high arrest toughness, the patent No. is " high-intensity high-tenacity line of pipes steel and preparation method thereof " of putting down in writing in 200410013265.1 the Chinese invention patent specification sheets, and the patent No. is " the high-strength electric resistance welded effective hot-rolled steel sheet " put down in writing in the JP082771991 Japan patent of invention specification sheets; Above-mentioned technology all adopts Mo as main strengthening element, and assists interpolation copper (Cu), nickel (Ni), vanadium elements such as (V) to produce the pipeline steel roll with high strength and high tenacity.And the API X80 level pipe line steel that Japanese patent of invention JP2004277809, JP2003231940 and " Bae; C S Park; S H Ro; K S Kwon; O J Park, J H, Development of High-Strength Linepipe (API-X80 Grade) Steels; Dec.1992, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE ANDTECHNOLOGY (POHANG CITY) TECHNICAL RESEARCH REPORT " document are introduced; The addition of molybdenum in its technology (Mo) is all more than or equal to 0.20%, and auxiliary copper (Cu), the nickel elements such as (Ni) of adding, and produces the pipeline steel roll with high strength and high tenacity.Yet above-mentioned these microalloyed steels, because the addition of molybdenum (Mo) is bigger, and assists and added nickel (Ni), vanadium elements such as (V), not only cost of alloy is very high, and needs low rolling temperature, rolling difficulty is also very big.
In order to address the above problem, the scientific research personnel furthers investigate the structural transformation and the performance of high grade of steel pipe line steel, attempt to substitute Mo by adding high-content Nb, in the pipeline steel roll production technique, adopt the high Nb composition of C-Mn-Cr-system, cooperate the reinforcement of other alloying elements can obtain the favorable mechanical performance.But do not add highly malleablized molybdenum (Mo) in the above-mentioned technology, ignored the effect of highly malleablized molybdenum (Mo) fully, the pipeline steel roll toughness that manufactures is obviously not enough, in fact can't be used to make the spiral shell submerged-arc welded (SAW) pipe that is suitable for the oil and gas pipeline engineering.
Summary of the invention
Purpose of the present invention is exactly to provide that a kind of expensive microalloy element content is few, the low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll and the manufacture method thereof of low production cost, with the manufacturing demand of the spiral shell submerged-arc welded (SAW) pipe that satisfies the oil and gas pipeline engineering.
For achieving the above object, the low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll that the present invention is designed, the Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.01～0.06, Si=0.10～0.40, Mn=1.00～1.80, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.08～0.18, Cu≤0.30, Mo=0.08～0.20, Cr=0.10～0.35, A1=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
Further, the preferred Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.043～0.046, Si=0.10～0.40, Mn=1.519～1.596, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.086～0.0928, Cu≤0.30, Mo=0.094～0.134, Cr=0.208～0.264, A1=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
The manufacture method of above-mentioned low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll, comprise by ultra-clean steel technology and smelt, the dark desulfurization of molten iron, converter top bottom blowing, ladle argon-blown refining, vacuum-treat, pour into the technology that the thick slab of 200～300mm, hot continuous mill controlled rolling and controlled cooling are handled, its special character is: in the described hot continuous mill controlled rolling and controlled cooling treatment process, earlier the slab that is poured into is heated to 1180～1250 ℃; Carry out roughing processing then, the roughing end temp is controlled at 1000～1100 ℃; Carry out finish rolling processing again, the finish rolling finishing temperature is controlled at 720～840 ℃; Finish rolling is carried out the laminar flow cooling process after finishing; At last the refrigerative steel plate is batched, coiling temperature is controlled at 400～580 ℃, can make the pipeline steel roll of 8～18mm.
Further, in the described hot continuous mill controlled rolling and controlled cooling treatment process, finishing temperature preferably is controlled at 790～830 ℃.
Further, in the described hot continuous mill controlled rolling and controlled cooling treatment process, coiling temperature preferably is controlled at 530～550 ℃.
The mechanism of action of each alloy ingredient of the present invention is as follows:
Carbon of the present invention (C) content is 0.01%～0.06%.Reduce carbon content, can prevent the generation of niobium carbide, have more content of niobium to be dissolved in the austenite during slab heating, thereby allow interpolation to be higher than the conventional content of niobium that uses.Low carbon content can guarantee that steel has high toughness, plasticity, good welding property and anti-HIC and anti-SSC ability.Low-carbon (LC) can also reduce segregation.
Niobium of the present invention (Nb) content is 0.08%～0.18%.High niobium significantly improves austenite recrystallization temperature, realizes high temperature rolling, can reduce mill load like this and enhance productivity.Like this can be by postponing austenite to ferritic transformation, NbC separates out and obtains additional strengthening effect in the volume fraction of raising bainite and the ferrite, finally obtains the mechanical property of high strength, high tenacity cooperation.
Chromium of the present invention (Cr) content is 0.10%～0.35%.Chromium suppresses the formation of proeutectoid ferrite, prolong the incubation period of ferrite forming core, reduce the growth rate of ferrite crystal grain, and it is less to the postponement of bainite transformation, reduce the temperature of the maximum velocity of transformation of bainite, make easier generation bainite transformation under identical cooling conditions, effect in this respect is only second to molybdenum, tungsten.Therefore, for saving cost, be development trend for molybdenum with chromium.Chromium also has solution strengthening in addition, and acidic conditions reduces the effect of corrosion speed.
Manganese of the present invention (Mn) content is 1.00%～1.80% manganese.High Mn promotes acicular ferrite nucleating, and high Mn/C ratio can improve yield strength and impelling strength, reduces the size of carbide precipitate, promotes the precipitation strength effect.
Molybdenum of the present invention (Mo) content is 0.08～0.20%.Molybdenum reduces γ → α transition temperature, suppresses polygonal ferrite and perlite forming core, promotes the formation of the acicular ferrite of high density dislocation substructure; In rolling the back process air cooler, can avoid forming martensite, and form the bainite and the acicular ferrite of microtexture, thereby cause good ductility; Offset Bauschinger effect, improve the tubing yield strength.
Phosphorus of the present invention (P) content≤0.018%, sulphur (S) content≤0.004%.In order to guarantee the toughness of steel plate, need steel grade to have higher purity and homogeneity.And P, S all are the harmful elements that influence performance, and the P height easily causes segregation, thereby influence the steel plate homogeneity of structure; S often exists with the oxide morphology of manganese, and this sulfide inclusion is very disadvantageous to the impelling strength of steel, particularly transverse toughness, and causes the anisotropy of performance and increase hydrogen and induce crack sensitivity.
Silicon of the present invention (Si) content is 0.10～0.40%.Play solution strengthening and improve the steel tensile strength.
Titanium of the present invention (Ti) content is 0.01～0.020%.Add certain Ti, but crystal grain thinning, the yield strength and the toughness of raising steel can also at high temperature combine with N, form the TiN particle, and the crystal grain of heat affected zone is controlled when helping welding, and improves the toughness of welded heat affecting zone.
Aluminium of the present invention (Al) content is 0.01～0.06%, plays desoxydatoin, reduces oxygen content in steel; Form A1N, crystal grain thinning.
Nitrogen of the present invention (N) content 0.002～0.008% belongs to normal remaining in the converter steel, can combine formation TiN, NbN with titanium in the steel (Ti), niobium (Nb) and separate out, and plays the inhibition austenite crystal and grows up and the precipitation strength effect.
Copper of the present invention (Cu) content is≤0.30%.Improve obdurability, the corrosion resistance nature of steel.
Test shows that the yield strength of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention can reach R
T0.5〉=530MPa ,-20 ℃ of A
KV〉=240J ,-10 ℃ of DWTT SA 〉=90%.Compared with prior art, has higher intensity and toughness, can satisfy fully under the prerequisite of demand of the effective high-intensity high-tenacity pipeline steel roll of oil and gas pipeline engineering spiral submerged arc welded, chromium (Cr) part with cheapness has replaced expensive molybdenum (Mo), and do not add nickel (Ni), vanadium elements such as (V), effectively reduce cost of alloy; Simultaneously, adopt such alloy compositions can obtain higher rolling temperature demand, reduced rolling difficulty.
Embodiment
Below in conjunction with specific embodiment low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention and manufacture method thereof are described in further detail:
The three kinds of specific embodiments of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention and the Chemical Composition of three kinds of comparative examples, corresponding rolling parameter and performance perameter are listed in the table 1; Wherein comparative example 3 has adopted the chemical composition identical with steel of the present invention, but rolling technology adopts higher rolling temperature, contrast as manufacture method with low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention, and comparative example 1 and comparative example 2 are existing X70 level pipe line steel, as the comparative example of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention.The manufacture method of these several low-carbon high-niobium chromium series high strength high tenacity pipeline steel rolls is as follows: comprise by ultra-clean steel technology and smelt, the dark desulfurization of molten iron, converter top bottom blowing, ladle argon-blown refining, vacuum-treat, pour into the technology that the thick slab of 200～300mm, hot continuous mill controlled rolling and controlled cooling are handled.Wherein: in the described hot continuous mill controlled rolling and controlled cooling treatment process, earlier the slab that is poured into is heated to 1180～1250 ℃; Carry out roughing processing then, the roughing end temp is controlled at 1000～1100 ℃; Carry out finish rolling processing again, the finish rolling finishing temperature is controlled at 720～840 ℃; Finish rolling is carried out the laminar flow cooling process after finishing; At last the refrigerative steel plate is batched, coiling temperature is controlled at 400～580 ℃, can make the pipeline steel roll of 8～18mm.For the coils of hot-rolled steel of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention, finishing temperature preferably is controlled at 790～830 ℃; And coiling temperature preferably is controlled at 530～550 ℃, is preferably 540 ℃.Finishing temperature preferably is controlled at 790～830 ℃, and coiling temperature preferably is controlled at 530～550 ℃, preferably is controlled at 540 ℃, can make the pipeline steel roll that rolls out have better intensity and toughness.
As shown in Table 1, steel of the present invention is for comparative example 1 and comparative example 2, keeping under performance and the essentially identical situation of existing X70 pipe line steel, greatly reduced the addition of expensive Mo, two kinds of elements of Cu, and do not add the comparatively expensive metallic elements of these two kinds of Ni, V, the Cr of the cheapness that employing can be extracted from industrial waste substitutes above-mentioned element, has greatly reduced cost of alloy.Steel of the present invention satisfies yield strength R
T0.5〉=530MPa ,-20 ℃ of A
KV〉=240J ,-10 ℃ of DWTT SA 〉=90% can satisfy the manufacturing demand of the spiral shell submerged-arc welded (SAW) pipe of oil and gas pipeline engineering fully.And can find out according to inventive embodiments and comparative example 3 contrasts, adopt the manufacture method of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll of the present invention, have higher slightly, lower slightly than the rolling temperature of comparative example 3 than the rolling temperature of existing X70 level pipe line steel, not only reached the purpose that reduces rolling difficulty, and having guaranteed that the pipeline steel roll that rolls out has better properties, its intensity, toughness have all obtained significantly improving.
The chemical ingredients of table 1. embodiment of the invention and comparative example, hot continuous rolling processing parameter and test-results tabulation
Claims (8)
1. low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll, it is characterized in that: the Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.01～0.06, Si=0.10～0.40, Mn=1.00～1.80, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.08～0.18, Cu≤0.30, Mo=0.08～0.20, Cr=0.10～0.35, Al=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
2. low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll according to claim 1, it is characterized in that: the Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.043～0.046, Si=0.10～0.40, Mn=1.519～1.596, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.086～0.093, Cu≤0.30, Mo=0.094～0.134, Cr=0.208～0.264, Al=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
3. low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll according to claim 1, it is characterized in that: the Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.043, Si=0.10～0.40, Mn=1.596, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.093, Cu≤0.30, Mo=0.094, Cr=0.208, Al=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
4. low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll according to claim 1, it is characterized in that: the Chemical Composition of this pipeline steel roll percentage ratio is by weight counted: C=0.046, Si=0.10～0.40, Mn=1.519, P≤0.018, S≤0.004, Ti=0.005～0.030, Nb=0.086, Cu≤0.30, Mo=0.134, Cr=0.264, Al=0.01～0.06, N=0.002～0.008, all the other inevitably are mingled with for Fe reaches.
5. the manufacture method of the described low-carbon high-niobium chromium of claim 1 a series high strength high tenacity pipeline steel roll, comprise by ultra-clean steel technology and smelt, the dark desulfurization of molten iron, converter top bottom blowing, ladle argon-blown refining, vacuum-treat, pour into the technology that the thick slab of 200～300mm, hot continuous mill controlled rolling and controlled cooling are handled, it is characterized in that: in the described hot continuous mill controlled rolling and controlled cooling treatment process, earlier the slab that is poured into is heated to 1180～1250 ℃; Carry out roughing processing then, the roughing end temp is controlled at 1000～1100 ℃; Carry out finish rolling processing again, the finish rolling finishing temperature is controlled at 720～840 ℃; Finish rolling is carried out the laminar flow cooling process after finishing; At last the refrigerative steel plate is batched, coiling temperature is controlled at 400～580 ℃, can make the pipeline steel roll of 8～18mm.
6. the manufacture method of low-carbon high-niobium chromium series high strength high tenacity pipeline steel roll according to claim 5 is characterized in that: in the described hot continuous mill controlled rolling and controlled cooling treatment process, the finish rolling finishing temperature is controlled at 790～830 ℃.
7. according to the manufacture method of claim 5 or 6 described low-carbon high-niobium chromium series high strength high tenacity pipeline steel rolls, it is characterized in that: in the described hot continuous mill controlled rolling and controlled cooling treatment process, coiling temperature is controlled at 530～550 ℃.
8. according to the manufacture method of claim 5 or 6 described low-carbon high-niobium chromium series high strength high tenacity pipeline steel rolls, it is characterized in that: in the described hot continuous mill controlled rolling and controlled cooling treatment process, coiling temperature is controlled at 540 ℃.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102172619A (en) * | 2010-12-31 | 2011-09-07 | 武汉钢铁(集团)公司 | Hot rolling process capable of improving high-grade thick pipeline steel fracture toughness |
| CN102400062A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | X130 pipe line steel with low yield ratio and ultrahigh strength and manufacturing method of hot rolled flat plate of X130 pipe line steel |
| 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 |
| CN107904496A (en) * | 2017-12-12 | 2018-04-13 | 首钢集团有限公司 | A kind of carbon dioxide corrosion resistant pipe line steel and its manufacture method |
| CN109321927A (en) * | 2018-11-21 | 2019-02-12 | 天津市华油钢管有限公司 | Anti-corrosion martensite spiral submerged welded pipe and its preparation process |
| CN111910126A (en) * | 2020-08-06 | 2020-11-10 | 东北大学 | Thick high-toughness X80 pipeline steel and production method thereof |
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2009
- 2009-04-10 CN CN200910061568A patent/CN101519752A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102400062A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | X130 pipe line steel with low yield ratio and ultrahigh strength and manufacturing method of hot rolled flat plate of X130 pipe line steel |
| CN102400062B (en) * | 2010-09-07 | 2014-04-02 | 鞍钢股份有限公司 | X130 pipe line steel with low yield ratio and ultrahigh strength and manufacturing method of hot rolled flat plate of X130 pipe line steel |
| CN102172619A (en) * | 2010-12-31 | 2011-09-07 | 武汉钢铁(集团)公司 | Hot rolling process capable of improving high-grade thick pipeline steel fracture toughness |
| 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 |
| CN107904496A (en) * | 2017-12-12 | 2018-04-13 | 首钢集团有限公司 | A kind of carbon dioxide corrosion resistant pipe line steel and its manufacture method |
| CN109321927A (en) * | 2018-11-21 | 2019-02-12 | 天津市华油钢管有限公司 | Anti-corrosion martensite spiral submerged welded pipe and its preparation process |
| CN111910126A (en) * | 2020-08-06 | 2020-11-10 | 东北大学 | Thick high-toughness X80 pipeline steel and production method thereof |
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Application publication date: 20090902 |