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    COLD ROLLING PROCESS FOR METAL TUBES
    3.
    发明专利
    COLD ROLLING PROCESS FOR METAL TUBES 未知

    公开(公告)号：CA2550913C

    公开(公告)日：2009-01-13

    申请号：CA2550913

    申请日：2006-06-27

    Applicant: SUMITOMO METAL IND

    Inventor： ONO TOSHIHIDE ,  TSUYUGUCHI SATOSHI

    IPC: B21B17/04 ,  B21B21/02 ,  B21B25/00

    Abstract: In the cold rolling process by pilger rolling that holds a mandrel betwe en each of paired roll-dies, by optimizing the side relief rate SR and the mandrel factors like the taper 81 in the primary deformation zone of the mandrel and the taper .theta.2 in the final size reduction zone thereof, and the feed rate F of the workpiece material, and at the same time by properly adjusting the relationship between the side relief rate SR and the feed rate F, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requiring a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inner coil eddy current testing.

    COLD ROLLING PROCESS FOR METAL TUBES
    4.
    发明专利
    COLD ROLLING PROCESS FOR METAL TUBES 未知

    公开(公告)号：CA2550931A1

    公开(公告)日：2006-12-28

    申请号：CA2550931

    申请日：2006-06-27

    Applicant: SUMITOMO METAL IND

    Inventor： TSUYUGUCHI SATOSHI ,  ONO TOSHIHIDE

    IPC: B21B17/04 ,  B21B21/02 ,  B21B25/00

    Abstract: In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the pass schedule factors such as the Area Rd, ID Rd and the feed rate F of the workpiece material, and further by properly selecting the taper .theta.1 in the primar y deformation zone of mandrel and the taper .theta.2 in the final size reducti on zone thereof, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requirin g a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inn er coil eddy current testing.

    COLD ROLLING PROCESS FOR METAL TUBES
    5.
    发明专利
    COLD ROLLING PROCESS FOR METAL TUBES 未知

    公开(公告)号：CA2550931C

    公开(公告)日：2009-01-06

    申请号：CA2550931

    申请日：2006-06-27

    Applicant: SUMITOMO METAL IND

    Inventor： TSUYUGUCHI SATOSHI ,  ONO TOSHIHIDE

    IPC: B21B17/04 ,  B21B21/02 ,  B21B25/00

    Abstract: In the cold rolling process by pilger rolling that holds a mandrel between each of paired roll-dies, by optimizing the side relief rate SR and the pass schedule factors such as the Area Rd, ID Rd and the feed rate F of the workpiece material, and further by properly selecting the taper .theta.1 in the primar y deformation zone of mandrel and the taper .theta.2 in the final size reducti on zone thereof, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requirin g a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inn er coil eddy current testing.

    6.
    发明专利
    未知

    公开(公告)号：BRPI0712692A2

    公开(公告)日：2013-04-24

    申请号：BRPI0712692

    申请日：2007-05-21

    Applicant: SUMITOMO METAL IND

    Inventor： HIDAKA YASUYOSHI ,  MATSUMOTO SATOSHI ,  ONO TOSHIHIDE ,  NAKAIKE KOUJI ,  IIDA SUMIO

    IPC: B21B25/04 ,  B21B23/00 ,  C21D3/04 ,  C21D9/08

    Abstract: A process for producing seamless pipes which comprises conducting a piercing rolling step, a elongating rolling step using a mandrel bar, and a sizing rolling step and subsequently conducting a product heat treatment. In the process, when the carbon-equivalent weight, namely the sum of the weight of graphite in the lubricant and the carbon content in the organic binder, per unit area of the lubricant adhering to the mandrel bar surface in the above-mentioned step of elongating rolling is expressed by C (g/m 2 ) or the maximum extent of carburization in the inner surface of the pipe to be heat-treated but prior to the heat treatment is expressed by ”C (% by mass), the heating temperature for the pipe to be heat-treated is expressed by T (°C), and the time during which a decarburizing gas is blown into the inside of the pipe to be heat-treated is expressed by t 1 or t 2 (seconds), and further, the blowing time calculated taking into account the wall thickness reduction in the step of cold working is expressed by t 3 or t 4 (seconds), a predetermined relation is satisfied and the actual decarburizing gas blowing time in the heat treatment is longer than the time t 1 , t 2 , t 3 or t 4 (seconds), whereby seamless stainless steel pipes reduced in carburized layer formation can be produced even when the carbon adhesion to the pipe inner surface is caused in, for example, mandrel mill rolling.

    7.
    发明专利
    未知

    公开(公告)号：BRPI0712244A2

    公开(公告)日：2012-01-17

    申请号：BRPI0712244

    申请日：2007-04-26

    Applicant: SUMITOMO METAL IND

    Inventor： HIDAKA YASUYOSHI ,  MATSUMOTO SATOSHI ,  ONO TOSHIHIDE ,  NAKAIKE KOUJI ,  IIDA SUMIO ,  NOGAMI HIROSHI

    IPC: B21B17/14 ,  B21B23/00 ,  B21B25/04 ,  C21D8/10 ,  C22C38/00 ,  C22C38/18 ,  C22C38/58

    Abstract: A process for stainless-steel pipe production which comprises piercing and rolling a raw material stainless steel containing, by mass, Cr: 10-30%, to give a hollow shell, elongating rolling the hollow shell using a mandrel bar, together with a graphite-free lubricant, to give a finishing rolling blank pipe and heating the blank pipe in a reheating furnace and subjecting the same to finishing rolling by sizing rolling to produce a hot-finished pipe, and then subjecting this pipe as a mother pipe to cold working to produce a stainless-steel pipe. In the reheating furnace, the finishing rolling blank pipe is heated to 1000°C or more and subjected to heating in which an oxidizing gas is blown into the pipe inside, whereby a stainless-steel pipe which is inhibited from forming a carburized layer in the pipe inner surface can be produced. When the finishing rolling by sizing rolling to give a cold working mother pipe is carried out by stretch reducer rolling at 860-1050°C, an annealing heat treatment of the mother pipe for cold working can be omitted. Thus, a stainless-steel pipe having excellent surface quality can be efficiently produced.

    COLD ROLLING PROCESS FOR METAL TUBES
    8.
    发明专利
    COLD ROLLING PROCESS FOR METAL TUBES 未知

    公开(公告)号：CA2550913A1

    公开(公告)日：2006-12-28

    申请号：CA2550913

    申请日：2006-06-27

    Applicant: SUMITOMO METAL IND

    Inventor： TSUYUGUCHI SATOSHI ,  ONO TOSHIHIDE

    IPC: B21B17/04 ,  B21B21/02 ,  B21B25/00

    Abstract: In the cold rolling process by pilger rolling that holds a mandrel betwe en each of paired roll-dies, by optimizing the side relief rate SR and the mandrel factors like the taper 81 in the primary deformation zone of the mandrel and the taper .theta.2 in the final size reduction zone thereof, and the feed rate F of the workpiece material, and at the same time by properly adjusting the relationship between the side relief rate SR and the feed rate F, the dimension-related shape characteristics (near-perfect round shape) of the tube inside surface after the final finishing rolling process by pilger rolling can be ascertained to thereby ensure excellent surface property without requiring a new apparatus, and further without causing the decrease of the product yield and/or the increase of the manufacturing costs. Thus, this can be widely applied for producing steam generator tubes which exhibits high S/N ratio in the inner coil eddy current testing.

    Method for cold-rolling metal tube
    9.
    发明专利
    Method for cold-rolling metal tube 有权
    用于冷轧金属管的方法

    公开(公告)号：JP2007038296A

    公开(公告)日：2007-02-15

    申请号：JP2006176005

    申请日：2006-06-27

    Applicant: Sumitomo Metal Ind Ltd ,  住友金属工業株式会社

    Inventor： TSUYUKUCHI SATOSHI ,  ONO TOSHIHIDE

    IPC: B21B21/02 ,  B21B25/00

    Abstract: PROBLEM TO BE SOLVED: To provide a method of cold-rolling a metal tube, which is excellent in the dimensional shape (out-of-roundness) and planar properties of the inner surface of a tube after the final finishing by pilger rolling and can guarantee S/N ratio at internal eddy current flaw detection.
    SOLUTION: In a cold-rolling method by pilger rolling using a pair of roll dies which is composed of a caliber constituted of a caliber diameter Dx and the amount Fx of side relief and providing a mandrel between the roll dies, in this the cold-rolling method of the metallic tube, the final finish rolling is performed by taking a side relief rate SR which is expressed by a formula (1) of the roll die as within the range of 0.5-1.0% and, as a pass schedule, a cross section Rd as 70-90%, the inside diameter Rd as 25-40% and the feed rate (per pass) of a material to be worked as 1.0-3.0 mm. SR(%)={(2×Fx)/(2×Fx+Dx)}×100 ... (1).
    COPYRIGHT: (C)2007,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种冷轧金属管的方法，该金属管在通过打包机进行最终精加工后的管的内表面的尺寸形状（不圆度）和平面性能优异 可以保证内部涡流探伤的S / N比。 解决方案：在使用由口径为Dx的口径和侧面浮雕的量Fx组成的一对辊模的滚压机的冷轧方法中，在辊模之间提供心轴，在此 对金属管的冷轧方法进行最终精轧，将由辊模的式（1）表示的侧面卸载速度SR取为0.5〜1.0％的范围，作为通过 横截面Rd为70-90％，内径Rd为25-40％，加工材料的进给速度（每次通过）为1.0-3.0mm。 SR（％）=ä（2×Fx）/（2×Fx + Dx）}×100 ...（1）。 版权所有（C）2007，JPO＆INPIT

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