CN111286675A - Production method of X80 hot rolled steel plate for large-caliber hot-bending pipe - Google Patents
Production method of X80 hot rolled steel plate for large-caliber hot-bending pipe Download PDFInfo
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Abstract
The production method of the X80 hot rolled steel plate for the large-caliber hot-bending pipe comprises the process route of molten iron pretreatment → converter → refining → continuous casting → billet direct-installed heating → rolling → pre-straightening → Mulpic → hot straightening → finishing → cold piling → flaw detection → warehousing. The steel comprises, by mass, 0.08% -0.10% of C, 0.15% -0.45% of Si, 1.55% -1.65% of Mn, 0.01% or less of P, 0.0018% or less of S, 0.012% -0.042% of Alt, 0.040% -0.090% of Nb, 0.015% -0.030% of Ti, 0.20% -0.30% of Cr, 0.20% -0.25% of Mo, 0.20% -0.25% of Ni, 0.20% -0.25% of Cu, 0.0005% or less of B, 0.51% -0.54% of Ceq, 0.21% -0.24% of Pcm, and the balance of Fe and inevitable impurities. The invention has the advantages of low cost, narrow components, high strength, high toughness, excellent weldability, low temper brittleness and the like, can produce bent pipes with the thickness of 30.5mm and the thickness of 33.8mmX80, has good cold bending surface quality, and has the grain size reaching grade 12.
Description
Technical Field
The invention belongs to the technical field of pipeline steel production, and relates to a production method of an X80 hot-rolled steel plate for a large-caliber hot-bending bend.
Background
With the rapid development of social economy, the demand of human energy is increasing, and the demand of petroleum and natural gas is increasing, for example, in recent years, large-caliber X80 grade pipeline steel is adopted in east west gas transmission three lines, east gas transmission four lines, new gas projects, middle and Russian east lines and the like which are successively built. Pipeline transportation with high pressure, large transportation volume and large pipe diameter is the main development trend of pipeline construction. The large-caliber high-steel-grade high conveying pressure is one of effective ways for improving conveying efficiency and saving manufacturing cost.
The hot bending bend is one of important components for oil and gas pipeline construction, and can change the pipeline transportation direction. The production process of the hot-bending bend is essentially a process of thermal deformation, quenching and tempering. In the process of bending the bent pipe, the parameters of metallographic structure, strength, impact toughness, weldability and the like of the raw materials are greatly changed due to the repeated heating of the parent metal, so that the selected materials have good high-temperature plasticity and are easy to deform; meanwhile, on the premise of meeting the weldability, the elbow pipe has better hardenability so as to ensure that the elbow pipe and the connected main line pipe have basically the same strength and toughness and good weldability after proper heat treatment.
Chinese patent CN109536831A discloses an X80 hot-rolled steel plate for a hot-bending main pipe and a manufacturing method thereof, wherein alloy elements Mn =1.65% -1.85%, and the Mn content is high, so that although the hardenability of the steel is improved and the hot-working performance of the steel is improved, the overheating sensitivity (coarse grain) of the steel is increased along with the increase of the Mn content, and the welding performance of the steel is influenced; the tempering brittleness is enhanced, and a banded and fiber community is easily formed, so that the improvement of the hot-bending toughness of the steel plate is influenced.
Chinese patent CN109055864A discloses a wide and thick steel plate for a hot-bending bend with high strength and toughness and low yield ratio and a production method thereof, wherein the wide and thick steel plate comprises alloy elements Mn =1.76% -1.95%, Mo =0.20% -0.35%, Cr =0.25% -0.45%, and the alloy elements are high in Mn content, high alloy is added and high in production cost.
Chinese patent CN107385340A discloses a rolling process of high-toughness hot-bending steel, wherein alloy elements nickel =0.6% -0.7% and molybdenum =0.28% -0.32%, although the requirement of high toughness is met, the excessive addition of the alloy elements invisibly increases the manufacturing cost by 980 yuan/ton, and the benefit is difficult to create for enterprises in industrial production.
Therefore, the prior art for producing the X80 steel plate for the large-caliber hot-bending elbow pipe has many defects: the Mn content is high; the uniformity of the steel plate in the degree direction is poor; the shape unevenness of the steel plate is over; the manufacturing cost is high; unstable impact toughness after hot roasting, and the like.
Disclosure of Invention
This patent aims at providing a production method that X80 hot-rolled steel plate for heavy-calibre hot-bending bend to solve current hot-bending bend X80 production technical problem. The produced X80 grade pipeline steel has the thickness of more than or equal to 32mm, the width of the steel plate of more than or equal to 4360mm, and the steel plate has low cost, high strength, strong low temperature toughness and good tear resistance.
The implementation scheme of the invention is as follows:
the production method of the X80 hot rolled steel plate for the large-caliber hot-bending pipe comprises the process route of molten iron pretreatment → converter → refining → continuous casting → billet direct-installed heating → rolling → pre-straightening → Mulpic (multifunctional intermittent cooling) → hot straightening → finishing → stacking cold → flaw detection → warehousing. The steel comprises, by mass, 0.08% -0.10% of C, 0.15% -0.45% of Si, 1.55% -1.65% of Mn, 0.01% or less of P, 0.0018% or less of S, 0.012% -0.042% of Alt, 0.040% -0.090% of Nb, 0.015% -0.030% of Ti, 0.20% -0.30% of Cr, 0.20% -0.25% of Mo, 0.20% -0.25% of Ni, 0.20% -0.25% of Cu, 0.0005% or less of B, 0.51% -0.54% of Ceq, 0.21% -0.24% of Pcm, and the balance of Fe and inevitable impurities; the key process steps are as follows:
(1) continuous casting: protecting and casting the ladle, the tundish and the crystallizer in the whole process, wherein the superheat degree is 10-15 ℃, the pulling speed is 0.5-0.9 m/min, the cooling mode adopts weak cooling, the secondary cooling water distribution is 0.35-0.50L/kg, and the low-power C-type segregation of the plate blank is less than or equal to 1.0 level;
(2) heating: the hot charging temperature of the steel billet is 350-600 ℃, the heating rate is 6-12 min/cm, and the continuous heating in different areas is as follows: the temperature of the steel tapping center is 1150-1220 ℃, the temperature of a first hearth is 800-1000 ℃, the temperature of a second hearth is 1100-1200 ℃, the temperature of a third hearth is 1150-1250 ℃, the temperature of a soaking hearth is 1150-1250 ℃, and the in-furnace time is 260-360 min;
(3) rolling: two-stage controlled rolling is adopted, and the thickness of the intermediate blank is set to be 3.5 times that of the finished product; the initial rolling temperature of rough rolling is 1150-1200 ℃, the final rolling temperature is 980-1000 ℃, the rolling speed is 0.8-1.5 m/s for 9-11 times; the start rolling temperature of finish rolling is 800-830 ℃, the finish rolling temperature is 700-740 ℃, the rolling speed is 2.5-5 m/s for 11-13 passes;
(4) and (3) cooling: straightening the rolled steel plate by a pre-straightening machine at the speed of 0.9-1.2 m/s; and (3) cooling intermittently in different regions, wherein a region A of the Mulpic is subjected to large-water-volume ultra-fast cooling, the water volume of the region A is 120-140, the ratio of the upper surface to the lower surface is 1:1.2, the final cooling temperature of the steel plate is adjusted to 400-450 ℃ in a region B/C/D of the Mulpic, the water volume of the region B/C/D is 60-80, the ratio of the upper surface to the lower surface is 1:1.3, the speed of a roller way is 0.9-1.2 m/s, and the cooling speed is 10-20 ℃/s.
The invention principle is as follows:
and (2) ensuring that the alloy is fully dissolved in the heating process, fully austenitizing crystal grains, and not coarsening and growing, and ensuring that the casting blank absorbs heat fully and the temperature is uniform. The lower the steel burning temperature, the finer the austenite grains are, the higher the Ar3 temperature is, the smaller the transformation product is, the austenite grains can be refined by reducing the austenitizing temperature, more nucleation positions can be provided, the generation of ferrite is facilitated, and the toughness of the material can be improved.
Regarding the step (3), the rolling is limited by the rolling force and the torque of the rolling mill due to the wide width of the steel plate, the equipment capacity of a plate factory with the width of five meters in the prior art is balanced, and the austenite grains are difficult to be refined by a method for improving the reduction rate. The method for reducing the rough rolling speed is adopted, the low rolling speed is more beneficial to crushing the original austenite grain size, refining grains in the center of the wall thickness and ensuring the uniformity of the structure in the thickness direction; and (3) finish rolling and low-temperature rolling are carried out, crystal grains are further refined, dislocation strengthening is increased, and favorable conditions are created for ferrite nucleation.
Compared with the prior art, the invention has the beneficial effects that: the alloy design cost is low, the component design is more beneficial to welding, and the hot-bending tempering brittleness of the steel pipe is reduced; the casting blank is hot-charged, so that the heating energy consumption is reduced, and the rough rolling high-temperature low-speed rolling improves the structural uniformity of the steel plate in the thickness direction; the dislocation strengthening effect is improved by finish rolling and low-temperature rolling, more nucleation points are provided for quick cooling, the size of rolled crystal grains is further refined, the Rt0.5: 600-650 MPa of a rolled steel plate, and the tensile strength Rm: 700-760 MPa, yield ratio: 0.83 to 0.87; elongation A5036% -42%; -45 ℃ impact toughness: 360-400J, D =2a, the cold-formed surface quality is good, the grain size reaches 12 grades, and the rolled steel plate has high strength, high toughness, excellent weldability and low temper brittleness, and provides good initial conditions for hot-bending the steel pipe.
Drawings
FIG. 1 is a photographic low magnification of a cast slab.
FIG. 2 is a SEM photograph of a steel plate.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1: the 30.5mm large-caliber hot-bending pipe is made of an X80 steel plate.
The steel has a chemical composition of, by mass, C =0.09%, Si =0.25%, Mn =1.60%, P = 0.008%, S =0.0016%, Alt = 0.034%, Nb = 0.056%, Ti = 0.016%, Cr =0.25%, Mo =0.23%, Ni =0.23%, Cu =0.25%, B =0.0004%, Ceq =0.53%, Pcm =0.23%, and the balance being Fe and unavoidable impurities; the production process comprises the following steps:
(1) continuous casting: the whole process of the large ladle, the middle ladle and the crystallizer is protected for casting, the superheat degree is controlled at 12 ℃, the drawing speed is controlled at 0.6m/min, the cold removal mode adopts weak cooling, the secondary cooling water distribution is controlled at 0.45L/kg, and the low-power C-type segregation of the plate blank is less than or equal to 1.0 level.
(2) Heating: the hot charging temperature of the steel billet is 416 ℃, the heating rate is 8min/cm, and the continuous heating in different areas is as follows: the temperature of the steel tapping center is 1150-1220 ℃, the temperature of a first hearth is 800-1000 ℃, the temperature of a second hearth is 1100-1200 ℃, the temperature of a third hearth is 1150-1250 ℃, the temperature of a soaking hearth is 1150-1250 ℃, and the furnace time is 286 min;
(3) rolling: the rolling adopts two-stage controlled rolling, and the thickness of the intermediate billet is set to be 115 mm; the initial rolling temperature of rough rolling is 1150-1200 ℃, the final rolling temperature is 980-1000 ℃, the rolling speed is 0.8-1.5 m/s for 9 passes; the start rolling temperature of finish rolling is 800-830 ℃, the finish rolling temperature is 700-740 ℃, the rolling speed is 2.5-5 m/s for 11-13 passes;
(4) and (3) cooling: the rolled steel plate passes through a pre-straightening machine at the speed of 1.0m/s, the straightened steel plate is straight, and is cooled intermittently in a partitioned mode, wherein a region A of the Mulpic adopts large-water-volume ultra-fast cooling, and the water volume of the region A is 120: 140, the ratio of the upper surface to the lower surface is 1:1.2, the proper amount of a B/C/D zone of the Mulpic is 60:80, the final cooling temperature is 400-450 ℃, the ratio of the upper surface to the lower surface is 1:1.3, the speed of a roller way is 1.0m/s, and the cooling rate is 15 ℃/s.
The results of the performance measurements are shown in Table 1.
Example 1: the 33.8mm large-caliber hot-bending pipe is made of an X80 steel plate.
The steel has a chemical composition of, by mass, C =0.09%, Si =0.27%, Mn =1.62%, P = 0.007%, S =0.0012%, Alt = 0.032%, Nb = 0.058%, Ti =0.012%, Cr =0.24%, Mo =0.24%, Ni =0.23%, Cu =0.24%, B =0.0003%, Ceq =0.53%, Pcm =0.23%, and the balance being Fe and unavoidable impurities;
the production process of the steel comprises the following steps and parameters:
(1) continuous casting: the whole process of the large ladle, the middle ladle and the crystallizer is protected for casting, the superheat degree is controlled to be 11 ℃, the drawing speed is controlled to be 0.6m/min, the cold removal mode adopts weak cooling, the secondary cooling water distribution is controlled to be 0.46L/kg, and the low-power C-type segregation of the plate blank is less than or equal to 1.0 level.
(2) Heating: the hot charging temperature of the steel billet is 433 ℃, the heating rate is 8min/cm, and the continuous heating is carried out by zones: the temperature of the steel tapping center is 1150-1220 ℃, the temperature of a first hearth is 800-1000 ℃, the temperature of a second hearth is 1100-1200 ℃, the temperature of a third hearth is 1150-1250 ℃, the temperature of a soaking hearth is 1150-1250 ℃, and the in-furnace time is 280 min;
(3) rolling: the rolling adopts two-stage controlled rolling, and the thickness of the intermediate billet is set to be 120 mm; the initial rolling temperature of rough rolling is 1150-1200 ℃, the final rolling temperature is 980-1000 ℃, the rolling speed is 0.8-1.2 m/s for 9 passes; the start rolling temperature of finish rolling is 800-820 ℃, the finish rolling temperature is 700-730 ℃, the rolling speed is 2.5-5 m/s for 11-13 passes;
(4) and (3) cooling: the rolled steel plate passes through a pre-straightening machine at the speed of 0.9m/s, the straightened steel plate is straight, and is cooled intermittently in a partitioned mode, wherein a region A of the Mulpic adopts large-water-volume ultra-fast cooling, and the water volume of the region A is 130: 150, the ratio of the upper surface to the lower surface is 1:1.2, the proper amount of a B/C/D zone of Mulpic is 70:90, the final cooling temperature is 400-440 ℃, the ratio of the upper surface to the lower surface is 1:1.3, the speed of a roller way is 0.9m/s, and the cooling rate is 14 ℃/s.
The results of the performance measurements are shown in Table 1.
Table 1 results of property measurements of steels of examples
Claims (1)
1. The production method of the X80 hot rolled steel plate for the large-caliber hot-bending pipe is characterized by comprising the following steps: the steel comprises, by mass, 0.08% -0.10% of C, 0.15% -0.45% of Si, 1.55% -1.65% of Mn, 0.01% or less of P, 0.0018% or less of S, 0.012% -0.042% of Alt, 0.040% -0.090% of Nb, 0.015% -0.030% of Ti, 0.20% -0.30% of Cr, 0.20% -0.25% of Mo, 0.20% -0.25% of Ni, 0.20% -0.25% of Cu, 0.0005% or less of B, 0.51% -0.54% of Ceq, 0.21% -0.24% of Pcm, and the balance of Fe and inevitable impurities; the key process steps comprise:
(1) continuous casting: protecting and casting the ladle, the tundish and the crystallizer in the whole process, wherein the superheat degree is 10-15 ℃, the pulling speed is 0.5-0.9 m/min, the cooling mode adopts weak cooling, the secondary cooling water distribution is 0.35-0.50L/kg, and the low-power C-type segregation of the plate blank is less than or equal to 1.0 level;
(2) heating: the hot charging temperature of the steel billet is 350-600 ℃, the heating rate is 6-12 min/cm, and the continuous heating in different areas is as follows: the temperature of the steel tapping center is 1150-1220 ℃, the temperature of a first hearth is 800-1000 ℃, the temperature of a second hearth is 1100-1200 ℃, the temperature of a third hearth is 1150-1250 ℃, the temperature of a soaking hearth is 1150-1250 ℃, and the in-furnace time is 260-360 min;
(3) rolling: two-stage controlled rolling is adopted, and the thickness of the intermediate blank is set to be 3.5 times that of the finished product; the initial rolling temperature of rough rolling is 1150-1200 ℃, the final rolling temperature is 980-1000 ℃, the rolling speed is 0.8-1.5 m/s for 9-11 times; the start rolling temperature of finish rolling is 800-830 ℃, the finish rolling temperature is 700-740 ℃, the rolling speed is 2.5-5 m/s for 11-13 passes;
(4) and (3) cooling: straightening the rolled steel plate by a pre-straightening machine at the speed of 0.9-1.2 m/s; and (3) cooling intermittently in different regions, wherein a region A of the Mulpic is subjected to large-water-volume ultra-fast cooling, the water volume of the region A is 120-140, the ratio of the upper surface to the lower surface is 1:1.2, the final cooling temperature of the steel plate is adjusted to 400-450 ℃ in a region B/C/D of the Mulpic, the water volume of the region B/C/D is 60-80, the ratio of the upper surface to the lower surface is 1:1.3, the speed of a roller way is 0.9-1.2 m/s, and the cooling speed is 10-20 ℃/s.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112126865A (en) * | 2020-09-25 | 2020-12-25 | 湖南华菱湘潭钢铁有限公司 | Rolling method of X80 pipeline steel plate |
| CN114645214A (en) * | 2022-03-26 | 2022-06-21 | 湖南华菱湘潭钢铁有限公司 | Micro-molybdenum high-phosphorus weathering steel and manufacturing method thereof |
| CN116752045A (en) * | 2023-06-27 | 2023-09-15 | 湖南华菱湘潭钢铁有限公司 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
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| CN109402500A (en) * | 2018-10-08 | 2019-03-01 | 鞍钢股份有限公司 | The hot-bending bends of low-temperature good toughness X80 Wide and Heavy Plates and its production method |
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| CN114645214A (en) * | 2022-03-26 | 2022-06-21 | 湖南华菱湘潭钢铁有限公司 | Micro-molybdenum high-phosphorus weathering steel and manufacturing method thereof |
| CN116752045A (en) * | 2023-06-27 | 2023-09-15 | 湖南华菱湘潭钢铁有限公司 | Production method of thick-wall longitudinal submerged arc welded pipe X80Q |
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