US20120017662A1 - Method for producing seamless steel tube and production facility therefor - Google Patents

Method for producing seamless steel tube and production facility therefor Download PDF

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Publication number
US20120017662A1
US20120017662A1 US13/247,120 US201113247120A US2012017662A1 US 20120017662 A1 US20120017662 A1 US 20120017662A1 US 201113247120 A US201113247120 A US 201113247120A US 2012017662 A1 US2012017662 A1 US 2012017662A1
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US
United States
Prior art keywords
hollow blank
diameter
rolling
steel tube
elongation
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Abandoned
Application number
US13/247,120
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English (en)
Inventor
Yusuke SENDAI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Publication date
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Assigned to SUMITOMO METAL INDUSTRIES, LTD. reassignment SUMITOMO METAL INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SENDAI, YUSUKE
Publication of US20120017662A1 publication Critical patent/US20120017662A1/en
Assigned to NIPPON STEEL & SUMITOMO METAL CORPORATION reassignment NIPPON STEEL & SUMITOMO METAL CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SUMITOMO METAL INDUSTRIES, LTD.
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes

Definitions

  • the present invention relates to a method for producing a seamless steel tube by the Mannesmann tube-making process, and a production facility for a seamless steel tube suitable for carrying out the production method.
  • a seamless steel tube can be used for oil well tubes for which high strength and toughness are required and can be produced by the Mannesmann tube-making process.
  • This tube-making process consists of the following steps:
  • a tube blank that was subjected to elongation-rolling is heated by a reheating furnace and is subjected to diameter-adjusting rolling.
  • the steel tube is again heated by a quenching furnace and is quenched.
  • a reheating furnace in the diameter-adjusting rolling process and a quenching furnace in the quenching process are eliminated, and a series of processes from piercing-rolling to diameter-adjusting rolling, and in some cases to quenching, may be arranged online as an online production facility.
  • reheating will not be performed at all even in diameter-adjusting rolling and quenching processes once the workpiece is heated for piercing-rolling.
  • the amount of heat shrinkage of the steel tube varies along a longitudinal direction while cooling, so that the diameter of the steel tube gets non-uniform along a longitudinal direction after cooling.
  • that the temperature distribution along a longitudinal direction is non-uniform causes the level of quenching to vary along a longitudinal direction, whereby the mechanical properties of the steel tube becomes non-uniform along a longitudinal direction after quenching
  • Patent Literature 1 discloses a technology to prevent the temperature of the workpiece from being excessively lowered while undergoing a continuous mill in a multi-stand continuous mill for use in the production of seamless steel tubes.
  • a reheating furnace is disposed at both the entrance and the intermediate position of the continuous mill, and thermometers are disposed at both the entrance and the exit of the intermediate reheating furnace, which is disposed at the intermediate position of the continuous mill, and further at the exit of the continuous mill so that the temperature control of the intermediate reheating furnace is performed based on the temperature of steel tube measured by each thermometer.
  • Patent Literature 2 discloses a technology of preventing the occurrence of wall thickness deviation caused by temperature decrease along a circumferential direction of a steel tube in a stretch reducer used in the production of electric resistance welded steel tubes.
  • a plurality of induction heating coils are disposed in series at the entrance of the stretch reducer, and a thermometer is disposed at both the exit side of the induction heating coil and the exit side of the stretch reducer, so that the electric power supply to the induction heating coil is adjusted based on the temperature values measured by the thermometer along a circumferential direction of the steel tube.
  • Patent Literature 3 discloses a technology for preventing the occurrence of bends when a rectangular steel tube or a round steel tube which has undergone hot forming is cooled.
  • a reheating furnace is disposed at the preceding stage of the forming means for hot forming a steel tube into a predetermined geometry
  • water discharge means is disposed at the subsequent stage of the forming means so that water is sprayed onto the steel tube, along its entire circumferential direction, that has undergone the forming means to thereby uniformly cool the steel tube.
  • step 1 measuring a temperature of the hollow blank along a longitudinal direction at the exit of the elongation-rolling mill
  • step 2 spraying water onto the hollow blank to cool the hollow blank at the entrance of the diameter-adjusting rolling mill according to a measured longitudinal temperature distribution of the hollow blank, whereby the longitudinal temperature distribution of the hollow blank becomes uniform.
  • the production method of the above described (I) may be configured such that quenching is performed without reheating subsequently to the diameter-adjusting rolling.
  • These production methods are preferably configured such that the amount of water to be sprayed onto the hollow blank in the above described step 2 is adjusted for every plurality of regions of the hollow blank sectioned in the longitudinal direction.
  • a production facility for a seamless steel tube including a piercing machine for piercing-rolling a heated billet to form the billet into a hollow blank, and an elongation-rolling mill for elongation-rolling the hollow blank and a diameter-adjusting rolling mill for diameter-adjusting rolling the hollow blank without reheating the hollow blank, the production facility including:
  • thermometer disposed at the exit of the elongation-rolling mill and for measuring a temperature of the hollow blank along a longitudinal direction
  • a water-cooling apparatus disposed at the entrance of the diameter-adjusting rolling mill, and for spraying water onto the hollow blank to cool the hollow blank according to a longitudinal temperature distribution of the hollow blank measured by the thermometer such that the longitudinal temperature distribution of the hollow blank becomes uniform.
  • FIG. 1 is a block diagram to illustrate a configuration example of a production facility for a seamless steel tube of the present invention.
  • FIG. 2 is a diagram to illustrate a configuration example of a water-cooling apparatus in the production facility for a seamless steel tube of the present invention, in which FIG. 2 ( a ) shows a side sectional view along a traveling direction of a hollow blank, and FIG. 2 ( b ) shows a front view, respectively.
  • FIG. 3 is a diagram to illustrate the correlation between the water amount to be sprayed per one meter in a longitudinal direction of the hollow blank and the amount of temperature reduction.
  • the present inventors have made an arduous study on a method for preventing non-uniformity of the longitudinal temperature distribution from occurring in a steel tube after diameter-adjusting rolling, based on the precondition that reheating is not performed all the way through diameter-adjusting rolling and quenching, once the workpiece is heated for piercing-rolling.
  • the following findings (a) and (b) have been obtained.
  • the present invention has been completed based on the above described findings (a) and (b).
  • preferable embodiments of the method for producing a seamless steel tube and the production facility therefor of the present invention will be described.
  • FIG. 1 is a block diagram to illustrate a configuration example of a production facility for a seamless steel tube of the present invention.
  • a production facility 1 includes, as a series of equipments in an online facility, a heating apparatus 2 , a piercing machine 3 (piercer), an elongation-rolling mill 4 (for example, a mandrel mill), a diameter-adjusting rolling mill 5 (for example, a sizer and a stretch reducer), and a cooling bed 6 .
  • the production facility 1 includes a thermometer 7 disposed at the exit of the elongation-rolling mill 4 , a water-cooling apparatus 8 disposed at the entrance of the following diameter-adjusting rolling mill 5 , and a control apparatus 9 , which is connected to the thermometer 7 and the water-cooling apparatus 8 .
  • the heating apparatus 2 heats a billet as a workpiece to a predetermined temperature suitable for piercing-rolling.
  • the piercing machine 3 pierces and rolls the heated billet to form it into a hollow blank.
  • the elongation-rolling mill 4 elongates and rolls the hollow blank without reheating it.
  • the diameter-adjusting rolling mill 5 performs diameter-adjusting rolling of the hollow blank that underwent elongation-rolling, without reheating it, thereby finishing a steel tube having a predetermined outer diameter and a wall thickness.
  • the steel tube that underwent diameter-adjusting rolling is air-cooled in the cooling bed 6 .
  • the temperature of the hollow blank which underwent elongation-rolling by the elongation-rolling mill 4 is measured by the thermometer 7 along a longitudinal direction.
  • the control apparatus 9 successively receives signals of measured temperature from the thermometer 7 and calculates the temperature distribution along a longitudinal direction of the hollow blank to send action signals according to the temperature distribution to the water-cooling apparatus 8 .
  • the water-cooling apparatus 8 sprays an appropriate amount of water onto the hollow blank based on the action signals from the control apparatus 9 to cool the hollow blank so that the longitudinal temperature distribution of the hollow blank becomes uniform.
  • the cooled hollow blank is subjected to diameter-adjusting rolling by the diameter-adjusting rolling mill 5 .
  • the hollow blank is transported in its longitudinal direction by a roller conveyor from the piercing machine 3 to the elongation-rolling mill 4 , and from the elongation-rolling mill 4 to the diameter-adjusting rolling mill 5 through the water-cooling apparatus 8 .
  • FIG. 2 is a diagram to illustrate a configuration example of a water-cooling apparatus in the production facility for a seamless steel tube of the present invention, in which FIG. 2 ( a ) shows a side sectional view along the traveling direction of a hollow blank, and FIG. 2 ( b ) shows a front view, respectively.
  • FIG. 2 ( a ) shows a side sectional view along the traveling direction of a hollow blank
  • FIG. 2 ( b ) shows a front view, respectively.
  • the traveling direction of the hollow blank is shown by a bold arrow.
  • the cooling apparatus 8 includes an annular ring made of pipe 11 wherein the center of the ring is positioned on the traveling path of the hollow blank P that passes through the ring.
  • the annular ring of pipe 11 is connected with a water supply tube 12 , which is connected with a water supply pump 13 .
  • the water supply pump 13 can be actuated based on the action signal from the control apparatus 9 shown in FIG. 1 described above so as to enable to adjust the amount of water to be supplied.
  • a plurality of nozzles 14 are disposed at constant intervals along a circumferential direction.
  • Each nozzle 14 sprays out water that is supplied to the annular ring of pipe 11 through the water supply tube 12 as the water supply pump 13 is actuated.
  • the hollow blank P which is traveled in a longitudinal direction is cooled uniformly along a circumferential direction every time it passes through the annular ring of pipe 11 .
  • the number of nozzles 14 is, though not particularly limited to, preferably about 4 to 24. This is because, if it is less than 4, uniform cooling may be insufficient along a circumferential direction of the hollow blank P, and if it is more than 24, it becomes redundant since sufficient uniform cooling should be achieved by specified nozzles.
  • Each nozzle 14 is preferably slightly inclined toward the opposite direction relative to the traveling direction of the hollow blank P (or the direction toward the bottom part side of the hollow blank). That is to prevent water from entering the inside of the hollow blank P, which has passed the annular ring of pipe 11 , from its rear end.
  • the production facility 1 shown in FIG. 1 described above may install the water-cooling apparatuses 8 of such configuration at multiple stages along the traveling path of the hollow blank P, but the installation of the water-cooling apparatus 8 at a single stage fares well.
  • a radiation thermometer may be adopted as the thermometer 7 .
  • the production facility 1 shown in FIG. 1 described above may include a rapid cooling apparatus in place of the cooling bed 6 , or in parallel with the cooling bed 6 without a quenching furnace being disposed, to perform quenching of the steel tube after diameter-adjusting rolling.
  • a rapid cooling apparatus one of water bath dipping type or one of laminar water downflowing type may be adopted.
  • a tempering furnace may be disposed at the subsequent stage of the rapid cooling apparatus in order to perform tempering of the steel tube after quenching.
  • a heated billet is subjected to piercing-rolling by the piercing machine 3 to be formed into a hollow blank, and is successively subjected to elongation-rolling by the elongation-rolling mill 4 and diameter-adjusting rolling by the diameter-adjusting rolling mill 5 without reheating the hollow blank at all.
  • the hollow blank after piercing-rolling tends to have non-uniform temperature distribution along its longitudinal direction caused by a significant amount of heat dissipation in its top part during piercing-rolling: therefore, the hollow blank after elongation-rolling should also have non-uniform temperature distribution along its longitudinal direction in a similar fashion.
  • the temperature of the hollow blank is measured along a longitudinal direction by the thermometer 7 at the exit of the elongation-rolling mill 4 . Then, water is sprayed onto the hollow blank at the entrance of the diameter-adjusting rolling mill 5 by the water-cooling apparatus 8 to cool the hollow blank according to the measured longitudinal temperature distribution of the hollow blank thereby making the longitudinal temperature distribution of the hollow blank uniform.
  • control apparatus 9 connected to the thermometer 7 determines the temperature for each of plural regions that are virtually allotted along the length of the hollow blank in a longitudinal direction, and selects a minimum temperature reading among the temperatures of allotted regions to determine temperature difference values between the minimum temperature and each region temperature. Then, based on the temperature differences, the amount of water to be sprayed onto the hollow blank from the water-cooling apparatus 8 is calculated for every region, and an action signal corresponding to the amount of water is transmitted to the water-cooling apparatus 8 . Thereby, the traveling hollow blank is cooled by being sprayed with an appropriate amount of water for each allotted region from the water-cooling apparatus 8 , thereby having a uniform longitudinal temperature distribution.
  • the amount of water to be sprayed onto the hollow blank can be calculated, for example, from the correlation with the amount of temperature reduction of the hollow blank shown in FIG. 3 described below, based on the above described temperature difference for each allotted region of the hollow blank.
  • FIG. 3 is a diagram to illustrate the correlation between the water amount to be sprayed per one meter of the hollow blank in a longitudinal direction and the amount of temperature reduction.
  • the same figure shows the result of the investigation of the amount of temperature reduction of the area where water is sprayed by performing testing in which hollow blanks with varied outer diameters and wall thicknesses are used, and water is sprayed onto each hollow blank heated to 1100° C. by varying the amount of water to be sprayed per one meter in its longitudinal direction.
  • the method for producing a seamless steel tube of the present invention since it is possible to spray water onto the hollow blank thereby making the longitudinal temperature distribution uniform when performing diameter-adjusting rolling, it never happens that the longitudinal temperature distribution becomes non-uniform in a steel tube after diameter-adjusting rolling.
  • the amount of heat shrinkage associated with cooling will not vary along a longitudinal direction, so that the outer diameter of the steel tube will become uniform over the entire region in a longitudinal direction after cooling.
  • the level of quenching will not vary along a longitudinal direction, and the mechanical properties of the steel tube become uniform over the entire region in a longitudinal direction after quenching.
  • the temperature of the hollow blank after elongation-rolling was measured and water was sprayed by the amount shown in Table 1 shown below to the hollow blank according to its longitudinal temperature distribution. Moreover, testing is carried out without spraying water for the comparison purpose.
  • the temperature of the seamless steel tube was measured immediately after diameter-adjusting rolling and, after further cooling the steel tube, the outer diameter of the steel tube was measured over the entire region in a longitudinal direction. The result thereof is also shown together in Table 1.
  • Table 1 the results for a top part region which is within 1 to 3 m from the front end of the steel tube, a middle part region which is in the range of 2 m across the length-wise middle of the steel tube, and a bottom part region which is within 1 to 3 m from the rear end of the steel tube are shown.
  • a full scale testing for producing a seamless steel tube of the specification described as below was carried out by performing piercing-rolling, elongation-rolling, and diameter-adjusting rolling by using the production facility shown in FIG. 1 described above, thereby confirming the effects of water spraying onto the hollow blank on the mechanical properties of the steel tube.
  • Material grade Low carbon steel with the chemical composition shown in Table 2 shown below.
  • the temperature of the hollow blank after elongation-rolling was measured and, according to its longitudinal temperature distribution, water is sprayed onto the hollow blank by the amount of water shown in Table 3 described below. Moreover, for the purpose of comparison, testing was carried out without spraying water.
  • the temperature of the seamless steel tube was measured immediately before quenching and after diameter-adjusting rolling and, after subjecting the steel tube to quenching and tempering, a specimen was collected from each part along a longitudinal direction to measure the grain size and the yield strength (YS).
  • the testing method for measuring the grain size and the yield strength conforms to ASTM testing standards. The results thereof are shown together in Table 3. Similarly to Example 1 described above, results for the top part region, the middle part region, and the bottom part region are shown in Table 3 as well.
  • the present invention can be effectively utilized in the production of a seamless steel tube by the Mannesmann tube-making process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Metal Rolling (AREA)
US13/247,120 2009-04-20 2011-09-28 Method for producing seamless steel tube and production facility therefor Abandoned US20120017662A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009-102312 2009-04-20
JP2009102312A JP5262949B2 (ja) 2009-04-20 2009-04-20 継目無鋼管の製造方法およびその製造設備
PCT/JP2010/053824 WO2010122847A1 (ja) 2009-04-20 2010-03-09 継目無鋼管の製造方法およびその製造設備

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EP (1) EP2422892A4 (pt)
JP (1) JP5262949B2 (pt)
CN (1) CN102405114A (pt)
BR (1) BRPI1009482A2 (pt)
WO (1) WO2010122847A1 (pt)

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CN104596176A (zh) * 2015-01-26 2015-05-06 张家港兴业钢管有限公司 生产无缝钢管用冷却系统
US20210213502A1 (en) * 2020-01-15 2021-07-15 Yanshan University Annular Cooling Device for Large-Scale Cylindrical Shell
CN113600619A (zh) * 2021-07-23 2021-11-05 中冶赛迪工程技术股份有限公司 一种小口径厚壁钢管轧后冷却方法
US11511326B2 (en) * 2017-11-29 2022-11-29 Nippon Steel Corporation Piercing machine, and method for producing seamless metal pipe using the same

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CN104138905B (zh) * 2014-07-01 2017-06-30 太原科技大学 无缝钢管连续式斜轧新工艺
JP6295387B1 (ja) * 2017-05-19 2018-03-14 山田 榮子 熱延棒鋼の制御冷却方法
CN111417471B (zh) * 2017-11-29 2022-04-01 日本制铁株式会社 无缝钢管的制造方法
CN108032040A (zh) * 2017-12-07 2018-05-15 浙江世达钢管有限公司 一种无缝薄壁不锈钢水管生产工艺
CN112680585B (zh) * 2019-10-17 2022-01-25 杰森能源技术有限公司 一种校直连续油管热处理变形的方法
CN111159919A (zh) * 2020-01-07 2020-05-15 安徽工业大学 一种衡量加热炉能耗分摊的方法
CN114589203B (zh) * 2022-01-25 2023-09-05 大冶特殊钢有限公司 一种适用于低温的09MnNiD无缝钢管的制备方法

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Publication number Priority date Publication date Assignee Title
CN104596176A (zh) * 2015-01-26 2015-05-06 张家港兴业钢管有限公司 生产无缝钢管用冷却系统
US11511326B2 (en) * 2017-11-29 2022-11-29 Nippon Steel Corporation Piercing machine, and method for producing seamless metal pipe using the same
US20210213502A1 (en) * 2020-01-15 2021-07-15 Yanshan University Annular Cooling Device for Large-Scale Cylindrical Shell
US11577289B2 (en) * 2020-01-15 2023-02-14 Yanshan University Annular cooling device for large-scale cylindrical shell
CN113600619A (zh) * 2021-07-23 2021-11-05 中冶赛迪工程技术股份有限公司 一种小口径厚壁钢管轧后冷却方法

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CN102405114A (zh) 2012-04-04
JP2010247218A (ja) 2010-11-04
WO2010122847A1 (ja) 2010-10-28
EP2422892A1 (en) 2012-02-29
BRPI1009482A2 (pt) 2016-03-01
JP5262949B2 (ja) 2013-08-14
EP2422892A4 (en) 2014-07-16

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