CN105200336A - Strain design region based high-performance pipeline steel with high-deformation resistance and preparation method - Google Patents
Strain design region based high-performance pipeline steel with high-deformation resistance and preparation method Download PDFInfo
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- 239000000126 substance Substances 0.000 claims abstract description 8
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
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- 239000012535 impurity Substances 0.000 claims abstract description 5
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- 229910000734 martensite Inorganic materials 0.000 claims description 6
- 150000002739 metals Chemical class 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 238000009749 continuous casting Methods 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 239000002253 acid Substances 0.000 abstract 1
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical class [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 15
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Abstract
The invention discloses strain design region based high-performance pipeline steel with high-deformation resistance and a preparation method and belongs to the technical field of high-strength pipeline steel. The chemical composition of the pipeline steel comprises components in percentage by weight as follows: 0.04%-0.07% of C, 0.02%-0.05% of Nb, 0.10%-0.30% of Si, 1.00%-1.60% of Mn, 0.01%-0.05% of Alt, 0.015%-0.025% of Ti, 0.15%-0.40% of Ni, 0.10%-0.30% of Cr, 0.10%-0.30% of Cu, smaller than or equal to 0.012% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.005% of N, smaller than or equal to 0.002% of O, smaller than or equal to 0.004% of B and the balance of Fe and inevitable impurities, wherein the content of C and Nb is 0.08%-0.10%, the content of Cr and Cu is 0.20%-0.40%, and the content of P, S, N, O and B is smaller than or equal to 0.016%. The high-performance pipeline steel has the advantages of excellent high-deformation resistance, low-temperature toughness, CTOD (crack tip opening displacement) fracture toughness and acid resistance.
Description
Technical field
The invention belongs to high-strength line-pipe steel technical field, particularly relate to a kind of based on stress design area high-performance large-deformation-resistance pipeline steel and preparation method, there is excellent Chinese People's Anti-Japanese Military and Political College's deformability, low-temperature flexibility, CTOD fracture toughness property, Antacid effectiveness, and the large-deformation-resistance pipeline steel that solderability is excellent, be applicable to the oil and gas pipes engineering construction based on stress design area.
Background technology
Along with the fast development of oil-gas resource, the exploitation of the oil-gas field environment critical zones development such as towards outlying desert, seismic zone, tundra, polar region and ocean in the world, transport pipe also inevitably undergos geologic hazard environment complicated and changeable, has had a strong impact on the safe operation of pipeline.For ensureing economy and the security of pipe-line construction and operation, the development trend of pipe line steel will be high strength, high tenacity, low temperature resistant, good weldability and Chinese People's Anti-Japanese Military and Political College's deformability.The economical large-deformation-resistance pipeline steel of high-strength grade is because having good over-all properties, especially excellent non-deformability, it will be an important directions of following pipe line steel production development, future in engineering applications is boundless, the market requirement is day by day urgent, caused the great attention of global plumbing installations, various countries are all actively promoting development and the application work of gross distortion pipe line steel.
The singularity that large-deformation-resistance pipeline steel is applied due to it, very strict to the requirement of performance, not only to meet the properties requirement of same grade of steel conventional pipeline steel, as higher intensity, good low-temperature impact toughness, and require that its longitudinal performance must have enough Chinese People's Anti-Japanese Military and Political College's deformabilities, namely require higher strain hardening exponents (n), larger uniform elongation (UEL%), lower yield tensile ratio (Rt0.5/Rm), good every stress-strain ratio, tensile stress-strain curve be dome-shaped (can not have yield point elongation) etc.
Large-deformation-resistance pipeline steel is due to the singularity of its metallographic structure form, its low temperature CTOD fracture toughness property, welding property and Antacid effectiveness etc. are more responsive, the defective phenomenon of easy appearance, especially girth welded joint performance and high efficiency more responsive to On-site Welding Technology, what add the circumferential weld employing of Chinese Petroliferous piping installation troop more than 90% is semi-automatic medicine core self-protecting welding equipment and technique, its circumferential weld welding technique and welding material also immature, its large-scale industrial application is restricted, therefore, want large-scale application large-deformation-resistance pipeline steel at home, need to develop as early as possible and there is excellent Chinese People's Anti-Japanese Military and Political College's deformability and low-temperature flexibility, and solve the CTOD fracture toughness property of product, Antacid effectiveness, and solderability, be applicable to large-deformation-resistance pipeline steel product and the production method thereof of semi-automatic medicine core non gas shielded welding technique.
Summary of the invention
The object of the present invention is to provide a kind of based on stress design area high-performance large-deformation-resistance pipeline steel and preparation method; product has excellent property of resisting large deformation and low-temperature flexibility; and solve the CTOD fracture toughness property of existing large-deformation-resistance pipeline steel, Antacid effectiveness and solderability, be applicable to the site girth welding seam welding of semi-automatic medicine core non gas shielded welding technique.
Chemical composition based on stress design area high-performance large-deformation-resistance pipeline steel of the present invention is: C:0.04 ~ 0.07%, Nb:0.02 ~ 0.05%, Si:0.10 ~ 0.30%, Mn:1.00 ~ 1.60%, Alt:0.01 ~ 0.05%, Ti:0.015 ~ 0.025%, Ni:0.15 ~ 0.40%, Cr:0.10 ~ 0.30%, Cu:0.10 ~ 0.30%, P :≤0.012%, S :≤0.003%, N :≤0.005%, O :≤0.002%, B :≤0.0004%, surplus is Fe and inevitable impurity element, and C+Nb:0.08 ~ 0.10%, Cr+Cu:0.20 ~ 0.40%, P+S+N+O+B :≤0.016%, be weight percentage,
The first-phase that this steel is made up of tiny Polygons proeutectoid ferrite, and comprise one or more second-phases formed in bainite, martensite, M/A island; First-phase proeutectoid ferrite grain-size is 1 ~ 8 μm;
This steel mechanical property is: yield tensile ratio≤0.80 of mother metal tensile performance in wale-wise, uniform elongation UEL >=10%, Rt1.5/Rt0.5 >=1.10, Rt2.0/Rt1.0 >=1.06, Rt5.0/Rt1.0 >=1.10, Rt0.4/Rt0.8≤0.93, Rt0.8/Rt1.5≤0.97, Rt1.5/Rm≤0.95; Mother metal laterally-10 DEG C of Charpy-V impact powers reaches more than 300J, and-10 DEG C of (DWTT) shear area of dropping hammer reach more than 85%; Semi-automatic medicine core self-shield girth welded joint-10 DEG C of weld metals and fusion area Charpy-V impact power reach more than 100J;-10 DEG C of weld metals of vertical masonry joint union-melt weld and heat affected zone Charpy-V impact power are stable reaches more than 150J; Mother metal-10 DEG C time fracture toughness CTOD value at more than 0.2mm; Antiacid crack length rate CLR≤15% under mother metal B solution condition, crack thickness rate CTR≤5%, crack-sensitivity rate CSR≤2%.
The preparation method of high-performance large-deformation-resistance pipeline steel of the present invention, comprises smelting molten steel, the operation such as continuous-casting of steel billet, steel billet reheat, controlled rolling, relaxation cooling, accelerating cooling, it is characterized in that:
(1) steel billet reheats temperature is 1120-1180 DEG C, and press 0.5-1.0min/mm heat-up time and control, soaking zone controls at 40-70min heat-up time;
(2) steel plate controlled rolling in two stages, first stage finishing temperature is 930-1010 DEG C, roughing end two percentage pass reductions control at 20-50%, then carry out treating temperature, treat that temperature thickness is 3-5 times of finished steel plate thickness, subordinate phase start rolling temperature is 800-860 DEG C, and roll speed is 2.5-5m/s, finishing temperature control is 730-790 DEG C of scope, and finish rolling end two percentage pass reductions control at 10-20%;
(3) carry out relaxation cooling after hot-rolled steel plate, relaxation time 0-90s, speed of cooling 0.2-1 DEG C/s, form the first-phase that tiny Polygons proeutectoid ferrite is formed;
(4) then carry out accelerating cooling, opening cold temperature is 680-740 DEG C, and final cooling temperature is 200-300 DEG C, and speed of cooling is 26-40 DEG C/s, is formed by one or more second-phases formed in bainite, martensite, M/A island.
The formation main points of content of the present invention are based on following understanding:
The intensity of C element to raising steel is effective, but be harmful to its low-temperature impact toughness, Antacid effectiveness and weldability thereof simultaneously, as everyone knows, C is easy segregation element and carbide forming element, higher C content can cause the degradation of welding property in welding process, especially for large-deformation-resistance pipeline steel, too much C is added to circumferential weld detrimental.Invention has been lot of experiments, by contrasting the circumferential weld performance of different C content large-deformation-resistance pipeline steels, finding: when C content is greater than 0.07%, its circumferential weld impelling strength is poor, and when C content is less than 0.04%, its tensile strength is lower, yield tensile ratio is higher, and Chinese People's Anti-Japanese Military and Political College's deformability is not enough.Therefore in the present invention, C content controls in 0.04 ~ 0.07% scope.
Nb element mainly plays the effect of solution strengthening and refined crystalline strengthening in pipe line steel, be effective, but higher Nb content can cause the degradation of weld metal impact property in welding process to intensity and the low-temperature flexibility carrying large-deformation-resistance pipeline steel.Invention has been lot of experiments, find: when Nb content is greater than 0.05%, its circumferential weld impelling strength is poor, and Nb content height can cause product yield strength higher, and affect yield tensile ratio and every stress-strain ratio, Chinese People's Anti-Japanese Military and Political College's deformability is poor.Therefore in the present invention, Nb content controls in comparatively low carbon content 0.02 ~ 0.05% scope.And the complex superposition effect of C content and Nb content also can bring impact to circumferential weld performance, and C+Nb content sum is too high, can cause circumferential weld impact toughness decreased, so must in control C+Nb:0.08 ~ 0.10% scope.
Mn element is conventional solution strengthening element, improves intensity and toughness, reduces the ductile-brittle transition temperature of steel simultaneously.But due to manganese in steel with carbon, phosphoric is the same all easily forms segregation line, causes the microstructure and hardness ununiformity of steel.For avoiding hard banded structure to occur, the addition of manganese will be restricted, and Mn content controls in 1.0 ~ 1.6% scopes, can significantly improve the Antacid effectiveness of product, CTOD fracture toughness property, and circumferential weld performance.
The tensile strength of Cr and Cu element to raising pipe line steel is effective, significantly can reduce the yield tensile ratio of material.But higher Cr, Cu content can be unfavorable to circumferential weld performance.Invention has been lot of experiments, by contrasting different Cr, Cu content, finding: when Cr+Cu content is greater than 0.40%, its circumferential weld impelling strength obviously reduces, but when Cr+Cu content is less than 0.20%, its tensile strength is lower, yield tensile ratio is higher, and Chinese People's Anti-Japanese Military and Political College's deformability is poor.Therefore in the present invention, Cr+Cu content controls in 0.20 ~ 0.40% scope.
Ni element is stabilization of austenite element, can reduce γ → α transition temperature, effectively can improve the low-temperature flexibility of pipe line steel.Ni improves the intensity of steel by solution strengthening effect, make up in think gauge steel because of strength degradation that the increase of thickness causes, invention has been lot of experiments, find when Ni content is greater than 0.15%, its low temperature CTOD fracture toughness property, Antacid effectiveness and circumferential weld are functional, but Ni is noble metal, alloy cost impact is comparatively large, and general control is in 0.15 ~ 0.40% scope.
Ti element is the effect of crystal grain thinning, and the present invention's control Ti:0.015 ~ 0.025% scope, can obtain good over-all properties.In steel, impurity element is more low better, in order to obtain the high-performance of Chinese People's Anti-Japanese Military and Political College's distortion, the present invention carries out lot of experiments, find that impurity element controls at P :≤0.012%, S :≤0.003%, N :≤0.005%, O :≤0.002%, B :≤0.0004%, and P+S+N+O+B :≤0.016%, useful to the low-temperature flexibility of product, CTOD fracture toughness property, Antacid effectiveness and weldability.
The present invention adopt this production technique according to being:
Control Heating temperature 1120-1180 DEG C, heat-up time 0.5-1.0min/mm, and the soaking zone time be greater than 40min, the present invention a large number of experiments show that, controlling heating controls favourable to original austenite grains, can improve product low-temperature flexibility, fracture toughness property and Antacid effectiveness etc.First stage, the draft that roughing end two passages are greater than 20%, made the abundant refinement of austenite recrystallization crystal grain and homogenizing by controlling lower finishing temperature 930-1010 DEG C; Subordinate phase adopts low temperature controlled rolling, control start rolling temperature 800-860 DEG C, finishing temperature 730-790 DEG C, roll speed 2.5-5m/s, and finish rolling end two percentage pass reductions are greater than 10%, make full use of low temperature controlled rolling effect, in the austenite inner accumulation dislocation of sclerosis, for follow-up phase transformation provides more forming core point, the present invention a large number of experiments show that, the processing parameter of two-phase control rolling can ensure that product fine microstructures is with even, has vital effect to follow-up low-temperature flexibility, CTOD fracture toughness property, Antacid effectiveness.Hot-rolled steel plate is laggard runs Henan cooling, control relaxation time 0-90s, speed of cooling 0.2-1 DEG C/s, ferrite crystal grain is avoided to grow up, obtain tiny Polygons proeutectoid ferrite, the present invention a large number of experiments show that, relaxation controls for the low yield strength ratio of product, high uniform elongation, every stress-strain ratio favourable, the property of resisting large deformation of product can be improved, and CTOD fracture toughness property and Antacid effectiveness etc.Eventually through accelerating cooling, control lower to open cold temperature 680-740 DEG C, final cooling temperature 200-300 DEG C and speed of cooling 26-40 DEG C higher/s, formed by one or more second-phases formed in bainite, martensite, M/A island, the present invention a large number of experiments show that, described accelerated cooling process parameter can obtain grain refining, phase transformation strengthening effect, and the performances such as antagonism gross distortion ability, low-temperature flexibility, CTOD fracture toughness property are favourable.
In sum, by controlling steel plate chemical composition and production technique, obtain good metallographic structure, make steel have excellent Chinese People's Anti-Japanese Military and Political College's deformability and low-temperature flexibility, and solve the CTOD fracture toughness property of existing large-deformation-resistance pipeline steel, Antacid effectiveness, union-melt weld performance and site girth welding seam performance.The comprehensive mechanical property of high-performance large-deformation-resistance pipeline steel of the present invention reaches following level:
(1) Chinese People's Anti-Japanese Military and Political College's deformability of mother metal: yield tensile ratio≤0.80 of tensile performance in wale-wise, uniform elongation UEL >=10%, Rt1.5/Rt0.5 >=1.10, Rt2.0/Rt1.0 >=1.06, Rt5.0/Rt1.0 >=1.10, Rt0.4/Rt0.8≤0.93, Rt0.8/Rt1.5≤0.97, Rt1.5/Rm≤0.95;
(2) low-temperature flexibility of mother metal: laterally-10 DEG C of Charpy-V impact powers reach more than 300J, and-10 DEG C of (DWTT) shear area of dropping hammer reach more than 85%;
(3) weldability: semi-automatic medicine core self-shield boxing-10 DEG C of weld metals and fusion area Charpy-V impact power reach more than 100J;-10 DEG C of weld metals of vertical masonry joint union-melt weld and heat affected zone Charpy-V impact power are stable reaches more than 150J;
(4) fracture toughness property: mother metal-10 DEG C time CTOD value at more than 0.2mm;
(5) Antacid effectiveness: antiacid crack length rate CLR≤15% under mother metal B solution condition, crack thickness rate CTR≤5%, crack-sensitivity rate CSR≤2%.
The invention has the advantages that: high-performance large-deformation-resistance pipeline steel over-all properties provided by the invention is good, can carry out large-scale promotion application, be widely used in building based on stress design area petroleum-gas pipeline engineering.
Accompanying drawing explanation
The optics Electronic Speculum macrograph of large-deformation-resistance pipeline steel in Fig. 1 the present invention.
The scanning electron microscope macrograph of large-deformation-resistance pipeline steel in Fig. 2 the present invention.
Embodiment
According to high-performance large-deformation-resistance pipeline steel of the present invention and production method thereof, 100 tons of converters are smelted, 4300mm production line carries out controlled rolling and controlled cooling, by JCOE/UOE production line tubulation, adopt semi-automatic flux cored arc welding technique to carry out circumferential weld welding.The present invention is further described by the following embodiment.Embodiment light plate chemical composition is in table 1, and embodiment process system is in table 2, and embodiment mechanical property is in table 3:
Embodiment chemical composition
Table 1. high-performance large-deformation-resistance pipeline steel of the present invention embodiment chemical composition (wt%)
Wherein, in embodiment 1-5, C+Nb controls: 0.08 ~ 0.10% scope, and Cr+Cu controls: 0.20 ~ 0.40% scope, and P+S+N+O+B controls :≤0.016% scope, is weight percentage.
Embodiment process system
Table 2. high-performance large-deformation-resistance pipeline steel of the present invention embodiment process system
Embodiment mechanical property
The metallographic structure of the high-performance large-deformation-resistance pipeline steel that the present invention produces is the first-phase be made up of tiny Polygons proeutectoid ferrite, and comprises one or more second-phases formed in bainite, martensite, M/A island; First-phase proeutectoid ferrite grain-size is 1 ~ 8 μm; Many experimental results of the present invention shows, metallographic structure is most important to product mechanical property, and metallographic structure form of the present invention, composition and size directly determine Chinese People's Anti-Japanese Military and Political College's deformability of product, low-temperature flexibility, CTOD fracture toughness property, Antacid effectiveness, straight weld performance and circular seam welding performance.
With reference to accompanying drawing 1 optics Electronic Speculum macrograph and accompanying drawing 2 scanning electron microscope macrograph.Embodiment mechanical property is as shown in table 3 below.
Table 3. embodiment high-performance large-deformation-resistance pipeline steel mechanical property
The present invention is by controlling steel plate chemical composition and production technique, obtain good metallographic structure, steel are made to have excellent Chinese People's Anti-Japanese Military and Political College's deformability and low-temperature flexibility, and solve the CTOD fracture toughness property of existing large-deformation-resistance pipeline steel, Antacid effectiveness, vertical masonry joint union-melt weld performance and site girth welding seam performance issue, the scale that can realize is applicable.
Claims (2)
1. use high-performance large-deformation-resistance pipeline steel based on stress design area for one kind, it is characterized in that: described steel chemical composition is: C:0.04 ~ 0.07%, Nb:0.02 ~ 0.05%, Si:0.10 ~ 0.30%, Mn:1.00 ~ 1.60%, Alt:0.01 ~ 0.05%, Ti:0.015 ~ 0.025%, Ni:0.15 ~ 0.40%, Cr:0.10 ~ 0.30%, Cu:0.10 ~ 0.30%, P :≤0.012%, S :≤0.003%, N :≤0.005%, O :≤0.002%, B :≤0.0004%, surplus is Fe and inevitable impurity element, and C+Nb:0.08 ~ 0.10%, Cr+Cu:0.20 ~ 0.40%, P+S+N+O+B :≤0.016%, be weight percentage,
The first-phase that this steel is made up of tiny Polygons proeutectoid ferrite, and comprise one or more second-phases formed in bainite, martensite, M/A island; First-phase proeutectoid ferrite grain-size is 1 ~ 8 μm;
This steel mechanical property is: yield tensile ratio≤0.80 of mother metal tensile performance in wale-wise, uniform elongation UEL >=10%, Rt1.5/Rt0.5 >=1.10, Rt2.0/Rt1.0 >=1.06, Rt5.0/Rt1.0 >=1.10, Rt0.4/Rt0.8≤0.93, Rt0.8/Rt1.5≤0.97, Rt1.5/Rm≤0.95; Mother metal laterally-10 DEG C of Charpy-V impact powers reaches more than 300J, and-10 DEG C of shear area of dropping hammer reach more than 85%; Semi-automatic medicine core self-shield girth welded joint-10 DEG C of weld metals and fusion area Charpy-V impact power reach more than 100J;-10 DEG C of weld metals of vertical masonry joint union-melt weld and heat affected zone Charpy-V impact power are stable reaches more than 150J; Mother metal-10 DEG C time CTOD value at more than 0.2mm; Antiacid crack length rate CLR≤15% under mother metal B solution condition, crack thickness rate CTR≤5%, crack-sensitivity rate CSR≤2%.
2. a preparation method for high-performance large-deformation-resistance pipeline steel described in claim 1, comprises smelting molten steel, the operation such as continuous-casting of steel billet, steel billet reheat, controlled rolling, relaxation cooling, accelerating cooling, it is characterized in that:
(1) steel billet reheats temperature is 1120-1180 DEG C, and press 0.5-1.0min/mm heat-up time and control, soaking zone controls at 40-70min heat-up time;
(2) steel plate controlled rolling in two stages, first stage finishing temperature is 930-1010 DEG C, roughing end two percentage pass reductions control at 20-50%, then carry out treating temperature, treat that temperature thickness is 3-5 times of finished steel plate thickness, subordinate phase start rolling temperature is 800-860 DEG C, and roll speed is 2.5-5m/s, finishing temperature control is 730-790 DEG C of scope, and finish rolling end two percentage pass reductions control at 10-20%;
(3) carry out relaxation cooling after hot-rolled steel plate, relaxation time 0-90s, speed of cooling 0.2-1 DEG C/s, form the first-phase that tiny Polygons proeutectoid ferrite is formed;
(4) then carry out accelerating cooling, opening cold temperature is 680-740 DEG C, and final cooling temperature is 200-300 DEG C, and speed of cooling is 26-40 DEG C/s, is formed by one or more second-phases formed in bainite, martensite, M/A island.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105886924A (en) * | 2016-04-28 | 2016-08-24 | 山东钢铁股份有限公司 | Low-alloy steel high in strength and toughness performance and preparing method of low-alloy steel |
| CN106011642A (en) * | 2016-07-08 | 2016-10-12 | 首钢总公司 | Basal material pipeline steel plate for corrosion/explosion-resistant composite plate and preparation method thereof |
| CN109811256A (en) * | 2019-01-15 | 2019-05-28 | 舞阳钢铁有限责任公司 | A kind of low yield strength ratio high-strength steel sheet and its production method |
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