CN104357749A - High-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes and production method thereof - Google Patents
High-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes and production method thereof Download PDFInfo
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- CN104357749A CN104357749A CN201410644766.3A CN201410644766A CN104357749A CN 104357749 A CN104357749 A CN 104357749A CN 201410644766 A CN201410644766 A CN 201410644766A CN 104357749 A CN104357749 A CN 104357749A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention relates to a high-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes, which is composed of the following components in percentage by weight: 0.03-0.06% of C, 0.25-0.35% of Si, 1.80-2.10% of Mn, at most 0.012% of P, at most 0.002% of S, 0.10-0.25% of Cr, 0.15-0.35% of Mo, 0.06-0.11% of Nb, 0.009-0.02% of Ti and at most 0.003% of N. CEpcm(%)=C+Si/30+(Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B<=0.2%. The production method comprises the following steps: smelting, and carrying out continuous casting to obtain a blank; heating the casting blank; carrying out hot rolling; carrying out laminar cooling; and coiling. When the included angle between the steel strip test sample direction and the rolling direction is 30 degrees, Rp0.2 is 630-720 MPa, Rm is greater than or equal to 730 MPa, Rp0.2/Rm is less than or equal to 0.90, the elongation percentage A is greater than or equal to 18%, Agt is greater than or equal to 6%, the -15 DEG C DWTT cross-section shearing rate SA is greater than or equal to 95%, HV10 is less than or equal to 265, the ballistic work single value at -20 DEG C is greater than or equal to 285J, and the ballistic work average value at -20 DEG C is greater than or equal to 355J, thereby completely satisfying the requirements of long distance and high efficacy for the spiral submerged arc welded pipe.
Description
Technical field
The present invention relates to a kind of pipeline hot rolled strip and production method, belong to a kind of spiral submerged arc welded effective high-strong toughness X90 hot rolled strip and production method particularly.
Background technology
Along with the develop rapidly of China's economy, national economy grows with each passing day to the demand of oil, Sweet natural gas equal energy source and interdependency.In view of the unbalanced present situation of China's natural gas resource distribution and the market requirement, large throughput rate long-distance transportation through pipeline becomes the important selection of China's natural gas conveying.
High-strength steel rank, large wall thickness, high pressure become the inexorable trend realizing the long distance of Sweet natural gas, high-efficiency pipeline conveying from now on.Under the prerequisite that the piping design such as caliber, pipeline pressure index is identical, it is thinning that raising pipeline grade of steel can realize pipeline wall thickness, thus improve pipeline welding efficiency, reduction steel for pipe, pipeline laying and running cost.The development of Hi-grade steel pipe line steel X90 has important practical significance to national energy strategic security.
For now, the research and development majority of oil, natural gas line X90 steel is researched and developed around straight-line joint submerged arc welding tube and X90 steel plate, and the research of spiral welded tube X90 steel band aspect is rare especially.The production efficiency of X90 steel band is far above X90 steel plate, and the spiral welded tube production efficiency matched with it is also obviously better than straight-line joint submerged arc welding tube, therefore comprises the second west to east gas pipeline project, adopt pipe line steel steel band and spiral submerged welded pipe thereof all in a large number in the national Important Project such as three lines of transferring natural gas from the west to the east.Because tubulation mode exists spiral welded tube or the difference with longitudinal welded pipe, the sampling direction that Pipeline Steel Properties inspection institute requires is corresponding be divided into roll in 30 ° or with laterally (with rolling in 90 °).Production practice and research show, the mechanical property of the horizontal sample of pipe line steel is far above being 30 ° of sample respective performances with rolling direction, and wherein the yield strength of horizontal sample generally exceeds rolling direction is 30 ° of sample about 50MPa.As can be seen here, the manufacturing technology of X90 steel plate cannot meet the requirement of spiral welded tube X90 steel band, and spiral welded tube with the development difficulty of X90 steel band far above steel plate for longitudinal welded pipe.The singularity developed with X90 steel band in view of spiral welded tube and importance, the invention provides a kind of spiral submerged arc welded effective high-strong toughness X90 hot rolled strip and production method.
Through retrieval, before making the present invention, what application number was that the Chinese patent of 201010546375.X relates to is the manufacture method of X90 weldless steel tube, and it adopts heat treatment mode to produce, and Production Flow Chart is long and energy consumption is large.Application number is 200710045314.3, 201110359356.0, 201310169449.6, 201310469620.5, 201410266532.X Chinese patent be longitudinal welded pipe X90 steel plate or steel pipe Patents, all be not suitable for spiral welded tube and the production of X90 steel band thereof, Cu in its Patent 200710045314.3, Cr, Ni, the content of Mo is too wide in range, directive significance is not possessed and cost is higher to production, other 4 patents have all separately or compound with the addition of noble metal Ni, Mo(is as Ni 0.20 ~ 0.50 or Ni 0.42, Mo0.39) total cost is added, what have with the addition of too much Cr(as Cr 0.25 ~ 0.50 or Cr0.35 ~ 0.65), be unfavorable for that X90 steel obtains excellent low-temperature impact toughness.Application number be 201010216400.8 Chinese patent relate to a kind of X90 spiral welded tube manufacture method, but the X90 steel band chemical composition system that patent relates to is complicated, production difficulty is sent to, and important alloying element only set upper limit value and wide scope, does not have actual production directive significance in addition.
Summary of the invention
The present invention is directed to the deficiency that prior art can not require for the preparation of the spiral submerged welded pipe of high-strong toughness, provide a kind of when steel band rolling direction is 30 ° of angles, its yield strength R
p0.2at 630 ~ 720MPa, tensile strength R
m>=730MPa, yield tensile ratio R
p0.2/ R
m≤ 0.90, unit elongation A>=18%, Stretching Agt>=6% ,-20 DEG C of ballistic work KV
2>=300J ,-15 DEG C of DWTT section shearing rate SA>=95%, hardness value HV
10≤ 265, the ballistic work monodrome>=285J at-20 DEG C, the spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel of ballistic work average>=355J and production method.
Realize the measure of above-mentioned purpose:
A kind of spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel, its component and weight percent content are: C:0.03 ~ 0.06%, Si:0.25 ~ 0.35%, Mn:1.80 ~ 2.10%, P≤0.012%; S≤0.002%, Cr:0.10 ~ 0.25%, Mo:0.15 ~ 0.35%, Nb:0.06 ~ 0.11%, Ti:0.009 ~ 0.02%, N≤0.003%, all the other are Fe and inevitable tramp element; And meet: CEpcm (%)=C+Si/30+ (Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B≤0.2%. simultaneously
It is: be added with Cu≤0.15% or Ni≤0.15% or both compounds.
Preferably: Cr weight percent content is 0.12 ~ 0.22%.
Preferably: Ti weight percent content is 0.011 ~ 0.018%.
Produce a kind of spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel, its step:
1) smelt also continuous casting and become base;
2) to strand heating, its Heating temperature is controlled at 1150 ~ 1200 DEG C;
3) hot rolling is carried out: control its roughing end temp and be not less than 1020 DEG C, single pass draft is not less than 16%; Control its finish rolling start rolling temperature and be no more than 950 DEG C, finishing temperature is at 830 ~ 860 DEG C, and previous three passes adds up draft and is not less than 48%;
4) carry out section cooling, under speed of cooling is 10 ~ 25 DEG C/s, is cooled to coiling temperature, and the water yield controlling upper and lower cooling manifold compares in 1:1.1 ~ 1.3;
5) batch, control its coiling temperature at 300 ~ 400 DEG C.
Preferably: coiling temperature is at 310 ~ 345 DEG C.
The effect of each element and master operation in the present invention
The present invention is designed to ensure that the performance of X90 coiled sheet reaches goal of the invention, and in chemical composition design process, emphasis considers following factor: the strength property of X90 steel, low-temperature flexibility and weldability.According to the factor of this three aspect in detail the effect of each element and the reason of limited amount in the present invention are described in detail below:
C:C is basic, the most most economical strengthening element, is effectively improved the intensity of steel by solution strengthening and precipitation strength.In the present invention, C content as lower than 0.03%, then can not meet the requirement of intensity, if its content is higher than 0.06%, then can reduce the plasticity of steel, toughness and weldability, therefore is controlled to be 0.03 ~ 0.06% by its content.
Si:Si mainly improves the intensity of steel with solution strengthening form, be also the deoxidant element in steel simultaneously.In the present invention, when its content is lower than 0.25%, make the DeGrain that it is strengthened, if its too high levels is in 0.30%, unfavorable to the toughness of steel again.Therefore its content is controlled to be 0.25 ~ 0.30%.
Mn:Mn is solution strengthening element important in steel, can compensate the lower loss of strength caused of C content in steel, and expand austenite phase transformation district, is conducive to obtaining tiny low temperature phase change product, improves the low-temperature flexibility of steel.In the present invention, when its content is higher than 2.10%, then segregation in steel can be caused serious, affect welding property.Therefore its content is controlled to be 1.80 ~ 2.10%.
Cr:Cr can improve hardening capacity and the intensity of steel effectively, suppresses polygonal ferrite and perlite to produce, promotes middle temperature transformation.Test of many times causes the impelling strength of steel obviously to decline after finding that Cr content is more than 0.25%.Therefore, in the present invention, Cr content controls 0.10 ~ 0.25%.Preferably: Cr weight percent content is 0.12 ~ 0.22%.
Mo:Mo can expand austenite phase transformation district, suppresses proeutectoid ferrite phase transformation, promotes that the tiny acicular ferrite containing highly dense dislocation is formed, and makes pipe line steel have good obdurability coupling.Can supercooled austenite be stablized simultaneously, form the M/A island of Dispersed precipitate, improve the Stretching Agt of steel.But when its content is lower than 0.10%, Zhong Wen phase-change product acicular ferrite structure ratio then can be caused to reduce, the intensity of steel is made to be difficult to reach X90 requirement, its content is as higher than 0.35%, M/A content in steel then can be caused excessively to increase, reduce the low-temperature flexibility of steel, therefore its content is controlled 0.10 ~ 0.35%.
Cu, Ni: be as adding the element that can not add in the present invention.
Nb:Nb has strong Grain Refinement Effect, can postpone austenite recrystallization, reduces transformation temperature, promotes tiny acicular ferrite performance, improves intensity and the toughness of steel.In the present invention, but when its content is lower than 0.06%, then can cause Nb(C, N in steel) amount of precipitation reduction, cause its precipitation strength effect not enough, its content is as higher than 0.11%, the solid solution Nb content in steel then can be caused to increase, not only do not have strengthening effect, and can promote that steel M/A content excessively increases, reduce the low-temperature flexibility of steel, therefore its content is controlled to be 0.06 ~ 0.11%.
Ti:Ti forms TiN in smelting process, avoids free atom N to weaken the toughness of steel.Meanwhile, TiN particle can hinder the alligatoring of austenite crystal in heat-processed, thus the phase-change product of refinement steel, improve the toughness of steel and heat affected zone thereof.Add appropriate Ti and also help lend some impetus to Nb performance solid solution strengthening effect.In the present invention, but when its content is lower than 0.011%, free atom N then in steel can not be fully cured into TiN, therefore the low-temperature flexibility of steel reduces, its content as higher than 0.02%, then can cause the waste of alloying element, simultaneously the more difficult control of precipitation process of Ti, add too much Ti and can increase strength fluctuation on steel band length direction, be unfavorable for product performance uniformity controlling.Therefore its content is controlled as≤0.02%.Preferably: Ti weight percent content is 0.011 ~ 0.018%.
P, sulphur S:P easily cause segregation, reduce the low-temperature flexibility of steel and worsen welding property in steel.S easily and Mn form MnS and be mingled with, affect the toughness of steel.Therefore, the content that the present invention should reduce P, S is as far as possible to reduce its disadvantageous effect to steel, and the content of P controls as P≤0.012%, and the content of S controls as S≤0.002%.
Coiled sheet of the present invention also should meet CEpcm≤0.20%, to ensure that invention steel has good welding property.
Why the present invention controls rough rolling step and adopts the large soft reduction process of single pass, machine bonding percentage pass reduction >=16%, to make the austenite crystal on X90 steel intermediate blank surface and heart portion carry out repeatedly Recovery and recrystallization under the effect of large pressure, achieve the object of slab thickness cross section Austenite Grain Refinement.
Why the present invention controls to add up draft >=48% in finish rolling stage previous three passes, to ensure that austenite crystal obtains high accumulative distortion and abundant flattening in non-recrystallization zone, thus make deformed austeaite inside have the accumulation of highdensity dislocation, promote the refinement of NbC disperse educt and middle temperature phase-change product in deformed austeaite.
Why the present invention controls section cooling cooling rate reaches 10 ~ 25 DEG C/S, to ensure that the austenite crystal of refinement and distortion is able to abundant transformation in low temperature phase change district, obtains evenly tiny acicular ferrite+M/A island heterogeneous structure.Simultaneously can the quantity of control M/A island and shape, and then improve obdurability and the Stretching Agt of X90 steel.
Why the present invention suitably increases the laminar flow but pars infrasegmentalis cooling manifold water yield, makes lower collector pipe water yield ratio control be 1:1.1 ~ 1:1.3, even to ensure X90 hot rolled strip upper and lower surface cooling degree, reduces the performance difference of steel band upper and lower surface.
The present invention compared with prior art, when X90 steel band sample direction and rolling direction are 30 ° of angles, its yield strength R
p0.2at 630 ~ 720MPa, tensile strength R
m>=730MPa, yield tensile ratio R
p0.2/ R
m≤ 0.90, unit elongation A>=18%, Stretching Agt>=6% ,-15 DEG C of DWTT section shearing rate SA>=95%, hardness value HV
10≤ 265, the ballistic work monodrome>=285J at-20 DEG C, ballistic work average>=355J at-20 DEG C, meet spiral submerged arc welded pipe range distance, dynamical requirement completely.
Embodiment
Below the present invention is described in detail:
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
Table 3 is various embodiments of the present invention and the list of comparative example Performance Detection situation.
Various embodiments of the present invention are produced according to following steps:
1) smelt also continuous casting and become base;
2) to strand heating, its Heating temperature is controlled at 1150 ~ 1200 DEG C;
3) hot rolling is carried out: control its roughing end temp and be not less than 1020 DEG C, single pass draft is not less than 16%; Control its finish rolling start rolling temperature and be no more than 950 DEG C, finishing temperature is at 830 ~ 860 DEG C, and previous three passes adds up draft and is not less than 48%;
4) carry out section cooling, under speed of cooling is 10 ~ 25 DEG C/s, is cooled to coiling temperature, and the water yield controlling upper and lower cooling manifold compares in 1:1.1 ~ 1.3;
5) batch, control its coiling temperature at 300 ~ 400 DEG C.
Table 1 various embodiments of the present invention and compared steel chemical composition (wt%)
The main processes of table 2 embodiment of the present invention and comparative example
Note: table 1 and the value in table 2, not to by relation, are only citing.
Table 3 various embodiments of the present invention and the list of comparative example mechanical property
From table 3 data, the mechanical property of the embodiment of the present invention, particularly yield strength and ballistic work are all better than comparative example.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (6)
1. a spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel, its component and weight percent content are: C:0.03 ~ 0.06%, Si:0.25 ~ 0.35%, Mn:1.80 ~ 2.10%, P≤0.012%; S≤0.002%, Cr:0.10 ~ 0.25%, Mo:0.15 ~ 0.35%, Nb:0.06 ~ 0.11%, Ti:0.009 ~ 0.02%, N≤0.003%, all the other are Fe and inevitable tramp element; And meet: CEpcm (%)=C+Si/30+ (Cr+Mn+Cu)/20+Mo/15+V/10+Ni/60+5B≤0.2%. simultaneously
2. a kind of spiral submerged arc welded as claimed in claim 1 effective high-strong toughness X90 hot-rolled steel, is characterized in that: be added with Cu≤0.15% or Ni≤0.15% or both compounds.
3. a kind of spiral submerged arc welded as claimed in claim 1 effective high-strong toughness X90 hot-rolled steel, is characterized in that: Cr weight percent content is 0.12 ~ 0.22%.
4. a kind of spiral submerged arc welded as claimed in claim 1 effective high-strong toughness X90 hot-rolled steel, is characterized in that: Ti weight percent content is 0.011 ~ 0.018%.
5. a kind of spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel described in production claim 1, its step:
1) smelt also continuous casting and become base;
2) to strand heating, its Heating temperature is controlled at 1150 ~ 1200 DEG C;
3) hot rolling is carried out: control its roughing end temp and be not less than 1020 DEG C, single pass draft is not less than 16%; Control its finish rolling start rolling temperature and be no more than 950 DEG C, finishing temperature is at 830 ~ 860 DEG C, and previous three passes adds up draft and is not less than 48%;
4) carry out section cooling, under speed of cooling is 10 ~ 25 DEG C/s, is cooled to coiling temperature, and the water yield controlling upper and lower cooling manifold compares in 1:1.1 ~ 1.3;
5) batch, control its coiling temperature at 300 ~ 400 DEG C.
6. produce the method for a kind of spiral submerged arc welded effective high-strong toughness X90 hot-rolled steel as claimed in claim 5, it is characterized in that: coiling temperature is at 310 ~ 345 DEG C.
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| CN201410644766.3A CN104357749A (en) | 2014-11-14 | 2014-11-14 | High-strength/toughness X90 hot-rolled steel strip for spiral submerged arc welded pipes and production method thereof |
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Cited By (5)
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| CN109023068A (en) * | 2018-09-04 | 2018-12-18 | 鞍钢股份有限公司 | The effective steel plate of VC reinforced by nanoparticles X90 plasticity and its manufacturing method |
| CN111607750A (en) * | 2020-06-30 | 2020-09-01 | 武汉钢铁有限公司 | X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof |
| CN111715984A (en) * | 2019-03-20 | 2020-09-29 | 天津市同鑫泰钢管制造有限公司 | High-strength anti-drag type long-distance spiral steel pipe for oil gas transmission and machining process thereof |
| CN112375968A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Production method of hot-rolled steel strip for drill rod of rotary drilling rig |
| CN113166905A (en) * | 2018-11-29 | 2021-07-23 | Posco公司 | Steel for high-strength thick pipe line having excellent low-temperature toughness and elongation and low yield ratio, and method for producing same |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109023068A (en) * | 2018-09-04 | 2018-12-18 | 鞍钢股份有限公司 | The effective steel plate of VC reinforced by nanoparticles X90 plasticity and its manufacturing method |
| CN113166905A (en) * | 2018-11-29 | 2021-07-23 | Posco公司 | Steel for high-strength thick pipe line having excellent low-temperature toughness and elongation and low yield ratio, and method for producing same |
| CN113166905B (en) * | 2018-11-29 | 2023-03-24 | Posco公司 | Steel for high-strength thick pipe line having excellent low-temperature toughness and elongation and low yield ratio, and method for producing same |
| CN111715984A (en) * | 2019-03-20 | 2020-09-29 | 天津市同鑫泰钢管制造有限公司 | High-strength anti-drag type long-distance spiral steel pipe for oil gas transmission and machining process thereof |
| CN111607750A (en) * | 2020-06-30 | 2020-09-01 | 武汉钢铁有限公司 | X90-grade high-strength pipeline steel plate coil with thickness of more than or equal to 20mm and manufacturing method thereof |
| WO2022001904A1 (en) * | 2020-06-30 | 2022-01-06 | 武汉钢铁有限公司 | X90-grade high-strength pipeline steel plate coil having thickness of ≥ 20 mm and manufacturing method therefor |
| CN112375968A (en) * | 2020-10-20 | 2021-02-19 | 包头钢铁（集团）有限责任公司 | Production method of hot-rolled steel strip for drill rod of rotary drilling rig |
| CN112375968B (en) * | 2020-10-20 | 2022-04-08 | 包头钢铁（集团）有限责任公司 | Production method of hot-rolled steel strip for drill rod of rotary drilling rig |
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