CN102247988B - Method for producing gas cylinder pipe with diameter of phi610 to 720 for natural gas underground storage well - Google Patents
Method for producing gas cylinder pipe with diameter of phi610 to 720 for natural gas underground storage well Download PDFInfo
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Abstract
The invention provides a method for producing a gas cylinder pipe with the diameter of phi610 to 720 for a natural gas underground storage well, which comprises the following steps of: smelting steel according to the material chemical component requirement in the execution standard, and adding a phi400 continuously cast round billet into a continuous pipe rolling mill unit; performing mechanical cold centering on a cold centering machine; heating the centered pipe billet in an annular heating furnace, preserving heat, punching, and performing hot sizing; sawing the head and the tail, marking a furnace number and a pipe number, heating a steel pipe serving as a pipe billet, preserving heat, and performing rotary expanding and rolling; adding the pipe billet obtained by reeling into a walking beam type reheating furnace, normalizing on line, and sizing by using a sizing mill to obtain a finished steel pipe product; and making the finished product pass through a finishing area, and performing aftertreatment on the finished product. The method has the advantages that: the external diameter dimensional tolerance of the finished seamless steel pipe product obtained by the method through control can reach -/+1 percent D, wall thickness tolerance can be effectively controlled to be -12.5 percent to +15 percent S, and curvature can reach 1.2 percent L; and the gas cylinder pipe for the gas storage well, which is produced by the method, has high geometric dimensional accuracy and low cost, and internal and external surfaces meet the quality requirement.
Description
Technical field
The natural gas subsurface storage well production method of gas cylinder tube that the present invention relates to a kind of major diameter natural gas subsurface storage well major diameter gas cylinder tube, particularly a kind of diameter of phi 610-Φ 720.
Background technology
In recent years, along with popularizing of clear energy sources natural gas motorcar, cleaning means of transport as the urban air cleaning project---gas combustion automobile is just widelyd popularize, supporting gas station construction also rapidly increases for it, but because the initial laying of pipe network investment is high, energy loss is large during transport gas, and traditional medium and small volume gas cylinder freight volume little, be difficult to realize continuous air feed.Diameter is increasing with the market demand of the equipment such as gas bomb group greater than heavy caliber natural gas gasholder station and the gas station of 610mm.As the raw material of making gas cylinder, gasholder station all has material impact with seamless steel pipe (abbreviation gasholder station gas cylinder tube) for the safety in utilization of natural gas gasholder station and reliability etc. with large-diameter high-pressure gas cylinders.
Safe, reliable for what guarantee to use, gas cylinder tube must have higher intensity and toughness and good extension property, above-mentionedly makes again after heat treatment mechanical property requirements of gas cylinder at spinning closing-in for gas cylinder tube.Therefrom can find out the regulation More different of performance and GB18248-2000 after the gas cylinder tube material heat treatment, intensity index decreases, but has increased the content of lower limit and yield tensile ratio; Elongation after fracture increases more; The temperature requirement of impact test is-50 ℃, has reduced by 30 ℃; And increased requirement to hardness.
For satisfying natural gas storing, transporting equipment manufacturing to the tighter instructions for use of mounted gas cylinder pipe combination property, adopt φ 720mm oblique rolling extension diameter unit and pushing formula thermal expansion machine group, based on the exploitation percentage elongation greater than high-intensity high-tenacity large-diameter high-pressure gas cylinders seamless steel pipe
Summary of the invention
For solving the problem that exists in the above-mentioned technology and the needs in market, the natural gas subsurface storage well production method of gas cylinder tube that the purpose of this invention is to provide a kind of diameter of phi 610-Φ 720, adopt continuous cast round billets, through the base pipe that obtains behind the PQF retained mandrel tandem rolling, revolve to roll through overheating deforming again and expand technique processed, reach specification requirement.
For achieving the above object, the technology of the present invention method provides the production method of the natural gas subsurface storage well usefulness gas cylinder tube of a kind of diameter of phi 610-Φ 720, and the method includes following steps:
1., require steel-making according to the material chemical composition of SA372 Grade J Class 70 operative norms, the continuous cast round billets of preparing φ 400 enters continuous rolling-tube unit;
2., the continuous rolling-tube unit continuous cast round billets rear and front end that will meet rolling requirement carries out mechanical cold centering at cold centring machine, fixed center offset requirement≤5mm, environment temperature is normal temperature;
2., the pipe heat tracing in rotary heating furnace after the centering, temperature is 1250 ℃～1270 ℃, then comes out of the stove to enter guide plate cone type piercer perforation;
4., then be five frame retained-mandrel MPM tandem rollings, ten frame slight stretch sizing mill hot sizes;
5., behind the sizing preparation through sawing end to end, steel pipe is as the base pipe behind the sign heat (batch) number pipe number, the base pipe carries out heat tracing in the stepping hearth furnace, temperature requirement is 1100 ℃～1170 ℃, come out of the stove change over to revolve expand rolling;
6., the rolling hollow forging that out obtains must pass through the expansion unit, 780 ℃～850 ℃ of expansion unit rolling temperatures, the screw rolling line shortcoming that occurs during elimination Rotary rolling mill group produces again;
7., the hollow billet that obtains behind the expansion enters the online normalizing of stepping beam type reheating furnace, normalizing temperature is 920 ℃～950 ℃;
8., with by the sizing mill sizing, can obtain fished pipe behind the sizing, enter Runout area through cold bed;
9., above-mentioned fished pipe carries out sawing or scale sawing, hydraulic pressure, ultrasonic examination detection, surveys the long mark of weighing, spray, storage behind the finishing air cooling.
Effect of the present invention be the finished product seamless steel pipe outside dimension tolerance that the inventive method control obtains can reach-/+1%D, wall thickness tolerance can effectively be controlled at-12.5%～+ 15%S, flexibility can satisfy 1.2%L.The gas cylinder gas storage well that the method is produced is high with the pipe geometric accuracy, surfaces externally and internally conforms to quality requirements, cost is lower.
Description of drawings
Fig. 1 is wall thickness measuring schematic diagram of the present invention;
Fig. 2 is Fig. 1 sectional view.
The specific embodiment
Reaching by reference to the accompanying drawings embodiment is described in detail the natural gas subsurface storage well of the diameter of phi 610-Φ 720 of the present invention production method with gas cylinder tube.
The specification of steel pipe and material trademark
Specification φ 610mm (24 inches) * 26mm,
φ 630mm (24.8 inches) * 26mm,
φ 720mm (28 inches) * 24mm
Operative norm ASME and present technique condition, material model SA372 Grade J Class 70.
Steel pipe of the present invention expands when processed revolving Rolling pipe expander and pushing formula pipe expanding set, and the lengthening coefficient of steel pipe is usually between 1.0～1.1; The enlarging rate of a general passage is 35～65%, and maximum can reach 75%.Hollow forging after the hole enlargement need to pass through expansion, again the heating and the sizing operation can obtain production tube.
The oblique rolling extension diameter unit also oblique milling unit with other type is the same, considers the working environment of top/plug and the factors such as temperature drop of service life and rolled piece during design, the length of rolling hollow forging generally be no more than 13.5m.
Oblique rolling extension diameter is the method by rolling acquisition maximum gauge, the thick seamless steel pipe of middle thin-walled up to the present.
The φ 406mm X 55mm steel pipe that uses 460 factories to provide is mother tube, revolves expansion at 720 units, main following steps: wherein chemical composition should meet the following table regulation:
Table one
1, the chemical composition according to table one requires steel-making, and the continuous cast round billets of preparing φ 400 enters the 460PQF continuous rolling-tube unit.
2, mechanical cold centering, fixed center offset requirement≤5mm are carried out in the 460PQF continuous rolling-tube unit continuous cast round billets rear and front end that will meet rolling requirement.
3, the pipe heat tracing in rotary heating furnace after the centering arrives 1250 ℃～1270 ℃, then comes out of the stove to enter the perforation of guide plate cone type piercer.
4, then be five frame retained-mandrel MPM tandem rollings, ten frame slight stretch sizing mill hot sizes.
5, behind the sizing preparation through sawing end to end, steel pipe turns 720 Rotary rolling mill groups as the base pipe behind the sign heat (batch) number pipe number.
6, the base pipe carries out heat tracing in the stepping hearth furnace, and temperature requirement is about 1100 ℃, come out of the stove revolve expand rolling.
7, the rolling hollow forging that out obtains must pass through the expansion unit again, approximately 780 ℃ of expansion unit rolling temperatures, this operation has even surfaces externally and internally and improves the directly effects such as degree, ovality and eccentricity of steel pipe, and can eliminate the shortcomings such as various screw rolling lines that the Rotary rolling mill group produces.
8, the hollow billet that obtains behind the expansion enters the online normalizing of stepping beam type reheating furnace, dimensional accuracy after can obtaining so better metal structure and being conducive to the sizing of steel pipe.
9, be exactly subsequently the sizing mill sizing, this sizing unit is unique one five the four roller sizing mills in the world, can obtain fished pipe behind the sizing, enters Runout area through cold bed.
10, above-mentioned fished pipe carries out sawing or scale sawing behind the finishing air cooling, hydraulic pressure, and flaw detection is surveyed the long spray mark of weighing, storage.
Mechanical property result after table two, the heat treatment
The specification of producing product has:
φ 610mm (24 inches) * 26mm; φ 630mm (24.8 inches) * 26mm; φ 720mm (28 inches) * 24mm
Sampling wherein performance data and the dimensional tolerance sampled data of the steel pipe that is in control with the sample of gas cylinder tube of 15 gasholder stations is as follows:
The evenness of wall thickness of gas cylinder tube has a significant impact weight and the serviceability of gas cylinder, and TPC0 advanced person's rolling unit provides assurance for evenness of wall thickness.Before dispatching from the factory, all steel pipes all through the check of ultrasonic wave total length thickness measuring, guarantee that the minimum wall thickness (MINI W.) of steel pipe is greater than standard-required.With manual calibrator gas cylinder tube being carried out wall thickness measuring, is a cross section every 1m along its length, be separated by 90 ° 4 points of every section gauge, as shown in Figure 2.
Definition gas cylinder tube evenness of wall thickness coefficient
For: with the ratio of maximum deviation with the average wall thickness value of the wall thickness value of 4 of quadratures on the cross section, namely
1. ￠ 610 * 26.5mm specification detects
The outside diameter measuring result is as shown in table 2.
Table 2 outside diameter measuring result
The wall thickness measuring result is as shown in table 3.
Table 3 wall thickness measuring result
2. ￠ 630 * 26.5mm specification detects
The outside diameter measuring result is as shown in table 4.
Table 4 outside diameter measuring result
The wall thickness measuring result is as shown in table 5.
Table 5 wall thickness measuring result
3. ￠ 711 * 26.8mm specification detects
The outside diameter measuring result is as shown in table 6.
Table 6 outside diameter measuring result
The wall thickness measuring result is as shown in table 7.
Table 7 wall thickness measuring result
Performance after the 52 stove gas cylinder tube sample heat treatments of batch production is added up, and the result is as shown in the table 2.Therefrom find out, the performance of gas cylinder can both satisfy the requirement of standard substantially after processing with this process heat, and performance inconsistency is less.
Gas cylinder tube adopts the hot rolling mode to produce, and may there be the defectives such as spiral, pockmark in surfaces externally and internally, therefore need carry out reconditioning and process.Outer surface must not have visual visible helical form cut, and rolling clear line should adopt the emery wheel reconditioning to fall, and as shown in Figure 1, a is pipe end cross section 1 among the figure, and b is apart from pipe end 380mm cross section 2, and c is apart from pipe end 380mm cross section 3, and d is cross section 4.Inner surface needs reconditioning to go out metallic luster, has not allowed the defectives such as visual visible cut, pit, pit.
The novel gas storage well working pressure of many specifications, wall thickness, internal volume, container capacity and filling weight introduction such as table 8:
Table 8 gas storage well calculates
Above calculating and design are all carried out according to U.S. dot standard, and last two classify the pipe that does not also revolve expansion specification out as.Can see, along with improving constantly of rolling mill practice level, the gas cylinder tube of 720 specifications can have been accomplished the volume of 3.6 the Water Cubes, has high economic worth.This product technology content is higher, belongs to high value added product.A great contribution to China's energy industry.
Claims (2)
1. the natural gas subsurface storage well of a diameter of phi 610mm-Φ 720mm is with the production method of gas cylinder tube, and the method includes following steps:
1., require steel-making according to the material chemical composition of SA372 Grade J Class 70 operative norms, the continuous cast round billets of preparing φ 400 enters continuous rolling-tube unit;
2., the continuous rolling-tube unit continuous cast round billets rear and front end that will meet rolling requirement carries out mechanical cold centering at cold centring machine, fixed center offset requirement≤5mm, environment temperature is normal temperature;
2., the pipe heat tracing in rotary heating furnace after the centering, temperature is 1250 ℃～1270 ℃, then comes out of the stove to enter guide plate cone type piercer perforation;
4., then be five frame retained-mandrel MPM tandem rollings, ten frame slight stretch sizing mill hot sizes;
5., the preparation behind the sizing, pipe through sawing end to end, and behind the sign heat (batch) number pipe number as the base pipe, the base pipe carries out heat tracing in the stepping hearth furnace, temperature requirement is 1100 ℃～1170 ℃, coming out of the stove, it is rolling to change the Rotary rolling mill group over to;
6., the rolling hollow forging that out obtains must pass through the expansion unit, 780 ℃～850 ℃ of expansion unit rolling temperatures, the screw rolling line shortcoming of the rolling middle appearance of elimination Rotary rolling mill group again;
7., the hollow billet that obtains behind the expansion enters the online normalizing of stepping beam type reheating furnace, normalizing temperature is 920 ℃～950 ℃;
8., with by the sizing mill sizing, can obtain fished pipe behind the sizing, enter Runout area through cold bed;
9., above-mentioned fished pipe carries out sawing or scale sawing, hydraulic pressure, ultrasonic examination detection, surveys the long mark of weighing, spray, storage behind the finishing air cooling.
2. described method according to claim 1, it is characterized in that: the natural gas subsurface storage well of described diameter of phi 610mm-Φ 720mm with the performance indications of gas cylinder tube is:
Hardness HBW:195～269
Tension/Mpa:725～865
Surrender/Mpa:485～735
Percentage elongation/%: 〉=20%
Yield tensile ratio/% :≤85
Ballistic work/J: 〉=40.
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| CN102703672B (en) * | 2012-06-29 | 2014-04-09 | 衡阳华菱钢管有限公司 | Large-caliber thick-wall steel pipe and normalizing method thereof |
| CN103447311A (en) * | 2013-09-12 | 2013-12-18 | 江绍成 | Method for controlling the size of hot ring rolling product based on online weighing |
| CN105018836B (en) * | 2015-07-13 | 2018-09-25 | 攀钢集团成都钢钒有限公司 | The preparation method of drilling machine drilling rod precision seamless steel tubes |
| CN105088093B (en) * | 2015-07-23 | 2017-03-22 | 天津钢管集团股份有限公司 | Low-temperature, low-yield-ratio and S355 steel grade type seamless structural steel tube and production method |
| CN115090710B (en) * | 2022-07-01 | 2024-06-21 | 衡阳华菱钢管有限公司 | P92 seamless steel tube and preparation method and application thereof |
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| CN101417296B (en) * | 2008-12-04 | 2010-09-08 | 天津钢管集团股份有限公司 | Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm |
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Effective date of registration: 20190626 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
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