WO2012077334A1 - 継目無管の製造方法 - Google Patents
継目無管の製造方法 Download PDFInfo
- Publication number
- WO2012077334A1 WO2012077334A1 PCT/JP2011/006813 JP2011006813W WO2012077334A1 WO 2012077334 A1 WO2012077334 A1 WO 2012077334A1 JP 2011006813 W JP2011006813 W JP 2011006813W WO 2012077334 A1 WO2012077334 A1 WO 2012077334A1
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- WIPO (PCT)
- Prior art keywords
- billet
- plug
- piercing
- rolling
- roll
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 34
- 238000000034 method Methods 0.000 title description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 60
- 238000005204 segregation Methods 0.000 claims abstract description 15
- 230000000669 biting effect Effects 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
- B21B21/02—Rollers therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/08—Diameter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/10—Cross-sectional area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
Definitions
- the present invention relates to a method for producing a seamless pipe by the Mannesmann pipe manufacturing method, and in particular, when a billet is pierced and rolled using a piercing machine, generation of wrinkles generated on the inner surface of the pipe due to center segregation and porosity in the billet.
- the present invention relates to a method for manufacturing a seamless pipe which is prevented.
- the seamless pipe can be manufactured by the Mannesmann pipe manufacturing method.
- This pipe making process consists of the following steps: (1) A round billet heated to a predetermined temperature is pierced and rolled by a piercing machine (piercer) and formed into a hollow shell (hollow shell); (2) The hollow shell is stretch-rolled by a stretching mill (eg, mandrel mill); (3) Using a constant diameter rolling mill (eg, stretch reducer), the stretched hollow shell is constant-rolled to a predetermined outer diameter and thickness.
- a stretching mill eg, mandrel mill
- a constant diameter rolling mill eg, stretch reducer
- the piercing machine used in piercing and rolling among these steps includes a plurality of inclined rolls, a plug, and a pusher as main components.
- the pusher is disposed on the entry side along the pass line.
- the plug is disposed on the exit side along the pass line.
- the inclined rolls are arranged around the plug in a state having a predetermined crossing angle and inclination angle with respect to the pass line.
- the billet heated in the heating furnace is supplied onto the pass line, and is conveyed toward the inclined roll and the plug along the pass line by pressing the rear end thereof with a pusher. Bites into the inclined roll. Thereafter, the billet bitten by the inclined roll advances while rotating on the pass line as the inclined roll rotates. At that time, due to the rotary forging effect, the billet is fragile due to successive Mannesmann fractures occurring in the central part until it reaches the plug tip, and the wallet is successively thickened by the plug contacting the central part and the inclined roll contacting the outer periphery. Processing is performed to form a hollow shell.
- the piercing and rolling is performed on a billet that has been continuously cast with a circular cross section and a billet that has a circular cross section that has been finished by subjecting the slab to hot plastic processing such as partial rolling. .
- the center segregation and porosity are more or less generated in such billets, particularly in the case of alloy steel such as stainless steel. For this reason, due to the center segregation and porosity in the billet, due to the rotary forging effect during piercing rolling and the additional shear deformation accompanying the wall thickness processing, the inner surface of the hollow shell after piercing has a leaf shape, fin shape, or wrapping -Like wrinkles (hereinafter also referred to as “inner surface wrinkles”) occur.
- Patent Document 1 discloses a seamless pipe manufacturing method in which the rotational speed of an inclined roll is limited to less than 4.5 m per second at a peripheral speed, and a back pressure is applied to the billet by a pusher until the billet stably bites into the inclined roll. Is disclosed. Furthermore, in the technique disclosed in the same document, the plug tip reduction ratio “d / D” defined by the ratio of the interval “d” between the inclined rolls at the plug tip position and the diameter “D” of the billet is 97% or more. Under such conditions, piercing and rolling is performed.
- Patent Document 2 discloses a pusher with variable forward speed and back pressure that applies a back pressure to the billet until the billet stably bites into the inclined roll. Further, the same document describes that the larger the reduction ratio “roll interval / billette diameter at the plug tip position” defined in the same manner as the plug tip reduction ratio shown in Patent Document 1, the greater the back pressure by the pusher. The reduction ratios are shown as 98%, 98.5%, 98.9% and 99.1%.
- the billet is set so that the billet traveling speed is equal to or higher than the steady-state traveling speed until the piercing and rolling reaches the steady state after the billet is caught in the inclined roll and comes into contact with the plug.
- a method of manufacturing a seamless pipe pressed by a pusher is disclosed. Furthermore, in the technique disclosed in the document, the ratio “Dg / d” of the roll diameter “Dg” of the inclined roll gorge portion to the billet diameter “d” is 4.5 or more, and the gorge portion
- the gorge draft ratio “Rg / d” defined by the ratio between the roll interval “Rg” and the billet diameter “d” is the difference between the length “L1” of the hollow shell after drilling and the length “L0” of the billet.
- the piercing and rolling is performed under conditions that satisfy a specified range corresponding to the piercing and rolling ratio “L1 / L0” defined by the ratio.
- the plug tip reduction ratio (TDF) defined by the following equation (a) is 0.04 or less, and / or the product of the plug tip reduction ratio (TDF) and the billet rotational speed “N”. While satisfying the condition that the square root “(TDF ⁇ N) 0.5 ” is 0 or 4 or less, the gorge reduction ratio defined in the same manner as the gorge draft ratio shown in Patent Document 3 is A method of manufacturing a seamless pipe that performs piercing and rolling under conditions that satisfy a specified range corresponding to the same piercing and rolling ratio is disclosed.
- TDF 1 ⁇ (d1 / Bd) (a)
- Bd billet diameter [mm]
- d1 slant roll spacing [mm] at the plug tip position.
- the ratio “L2 / d2” between the length “L2” of the rolled portion of the plug and the outer diameter “d2” of the plug reeling start point is the plug tip reduction ratio (TDF).
- TDF plug tip reduction ratio
- billet rotation speed “N” and piercing and rolling is performed using a plug having a shape satisfying a specified range corresponding to the square root “(TDF ⁇ N) 0.5 ”.
- the billet is pushed by the pusher until the steady state is reached.
- the present invention has been made in view of the above problems, and its object is to provide a method for producing a seamless pipe having the following characteristics: During piercing and rolling, the generation of internal flaws due to center segregation and porosity in the billet must be prevented.
- the gist of the present invention is as follows.
- a method of manufacturing a tube When the maximum diameter of the quality inferior region consisting of center segregation and porosity is d [mm] in the billet cross section, the seamless pipe manufacturing method is a plug tip reduction ratio represented by the following formula (1) ( Piercing and rolling under the condition that TDF) satisfies the following formula (2): A method for producing a seamless pipe characterized by the above.
- TDF (Bd ⁇ D1) / Bd (1) TDF ⁇ ⁇ 0.50 ⁇ (d / Bd) +0.06 (2)
- Bd billet diameter [mm]
- D1 slant roll spacing [mm] at the plug tip position.
- the method for producing a seamless pipe of the present invention has the following remarkable effects: During piercing and rolling, it is possible to reliably prevent the occurrence of internal flaws by taking into account the influence of the center segregation and porosity in the billet.
- FIG. 1 is a top view schematically showing a configuration example of a drilling machine to which the seamless pipe manufacturing method of the present invention can be applied.
- FIG. 2 is a side view schematically showing the periphery of the drilling position of the drilling machine shown in FIG.
- FIG. 3 is a schematic diagram for explaining various dimensions employed in the seamless pipe manufacturing method of the present invention.
- FIG. 3 (a) shows the relationship between inclined rolls, plugs and billets during piercing and rolling, and FIG. b) shows an inferior quality area in the billet.
- FIG. 4 is a diagram showing a situation in which an internal crack occurs due to the correlation between d / Bd and TDF in piercing and rolling of carbon steel.
- FIG. 5 is a diagram showing a situation in which an internal crack occurs due to the correlation between d / Bd and TDF in the piercing and rolling of 13% Cr steel.
- FIG. 1 is a top view schematically showing a configuration example of a drilling machine to which the seamless pipe manufacturing method of the present invention can be applied, and FIG. 2 schematically shows a periphery of a drilling position of the drilling machine. It is a side view.
- the punch 10 includes a pair of inclined rolls 1, a plug 2, a cored bar 3, a pusher 4, and an HMD (Hot Metal Detector) 5.
- HMD Hot Metal Detector
- the pair of inclined rolls 1 are arranged around the plug 2 so as to have a predetermined crossing angle ⁇ and inclination angle ⁇ with respect to the pass line X.
- the inclined roll 1 is not limited to the cone type as shown in FIGS. 1 and 2, and may be a barrel type.
- the punching machine 10 is not limited to a two-roll type provided with two inclined rolls 1 as shown in FIGS. 1 and 2, and may be a three-roll type provided with three inclined rolls.
- the plug 2 is fitted to the tip of the core metal 3 and coupled to the core metal 3, and is arranged on the pass line X between the inclined rolls 1 that are the exit side of the punching machine 10. This plug 2 can be applied with a special shape described later.
- the pusher 4 is arranged on the pass line X on the entry side of the punching machine 10.
- the pusher 4 shown in FIG. 1 includes a cylinder body 41, a cylinder rod 42, a connection member 43, and a billet push rod 44.
- the billet push rod 44 is coupled to the cylinder rod 42 by the connecting member 43 so as to be rotatable in the circumferential direction.
- the cylinder body 41 can be a hydraulic or electric type, and moves the cylinder rod 42 back and forth.
- the pusher 4 having such a configuration causes the tip of the billet push rod 44 to abut the rear end of the billet 20 supplied on the pass line X, and causes the cylinder rod 42 and the billet push rod 44 to advance by the cylinder body 41. To press the billet 20. Thereby, the billet 20 is conveyed along the pass line X toward the inclined roll 1 and the plug 2, and bites into the inclined roll 1. Further, the pusher 4 continues to press the billet 20 until the piercing and rolling reaches a steady state after the billet 20 bitten into the inclined roll 1 comes into contact with the tip of the plug 2, that is, during the unsteady state.
- the steady state means from the time when the tip of the pierced and rolled billet 20 (hollow blank tube) comes out of the inclined roll 1 to the time when the rear end of the billet 20 comes out of the inclined roll 1.
- the unsteady state refers to the period from when the tip of the billet 20 is bitten into the inclined roll 1 until the steady state is entered.
- the HMD 5 is disposed on the exit side of the punch 10 and in the vicinity of the rear end of the inclined roll 1.
- the HMD 5 detects whether or not the tip of the hollow core tube that has been pierced and rolled has passed between the inclined rolls 1, that is, whether or not the piercing and rolling has reached a steady state from an unsteady state.
- the method for manufacturing a seamless pipe according to the present invention is to pierce and roll a billet using the above-described piercing machine. Details of the method will be described below.
- FIG. 3 is a schematic diagram for explaining various dimensions employed in the seamless pipe manufacturing method of the present invention.
- FIG. 3 (a) shows the relationship between inclined rolls, plugs and billets during piercing and rolling, and
- FIG. b) shows an inferior quality area in the billet.
- the present invention has been completed on the basis of the knowledge that the degree of occurrence of center segregation and porosity in the billet greatly affects the generation of inner surface flaws, as will be demonstrated in the examples described later. That is, in the manufacturing method of the present invention, as shown in FIG. 3 (b), as the degree of occurrence of center segregation and porosity in the billet, attention is paid to a quality inferior region 21 consisting of center segregation and porosity in the cross section of the billet 20.
- d [mm] piercing and rolling is performed under the condition that the plug tip reduction ratio (TDF) expressed by the following equation (1) satisfies the following equation (2): I do.
- TDF (Bd ⁇ D1) / Bd (1) TDF ⁇ ⁇ 0.50 ⁇ (d / Bd) +0.06 (2)
- Bd billet diameter [mm]
- D1 slant roll spacing [mm] at the plug tip position (see FIG. 3A).
- the plug tip reduction ratio (TDF) is defined according to the above equation (2) according to the ratio “d / Bd” of the maximum diameter “d” of the quality inferior region 21 in the billet 20 and the billet diameter “Bd”.
- the reason is as follows. Since the inner surface defects generated by piercing and rolling are caused by center segregation and porosity, the ratio of the inferior quality region 21 (center segregation and porosity) in the billet cross section, that is, the ratio “d / Bd” is increased. It becomes easy to occur with it. For this reason, in order to prevent the occurrence of internal flaws, it is necessary to increase the amount of decrease in the plug tip reduction ratio as the ratio “d / Bd” increases, even if the plug tip reduction ratio is reduced.
- the interval “D1” of the inclined roll 1 at the plug tip position may be increased. This can be realized by using the inclined roll 1 designed in advance for such dimensions. In addition, it can also be realized by widening the installation interval between the inclined rolls 1 or arranging the plug 2 closer to the entry side of the pass line during piercing and rolling.
- the maximum diameter “d” of the quality inferior region 21 in the billet 20 can be grasped by collecting a cross-sectional sample from the billet 20 and examining the cross-section of the sample before piercing and rolling.
- the roll interval at the plug tip position is relatively wide with respect to the billet diameter.
- the bite is not stably bitten into the inclined roll, and there is a possibility that a roll biting failure may occur.
- the billet is continuously pressed by the pusher until the piercing and rolling reaches a steady state. Is preferred.
- whether or not the piercing and rolling has reached a steady state can be determined based on the detection result of the HMD 5 shown in FIG. For example, based on the detection result of the HMD 5, when the tip of the hollow shell passes between the inclined rolls 1, it is determined that the piercing and rolling has reached the steady state from the unsteady state, and the pusher 4 presses the billet 20. To stop.
- Roll gorge reduction rate In the production method of the present invention, it is preferable to perform piercing and rolling under the condition that the roll gorge reduction ratio (GDF) represented by the following formula (3) is in the range of 12% to 15%.
- GDF (Bd ⁇ D2) / Bd ⁇ 100 (3)
- Bd billet diameter [mm]
- D2 spacing [mm] between gorge portions of inclined rolls (see FIG. 3A).
- the roll gorge reduction ratio (GDF) is defined in this way is as follows.
- the roll interval “D2” decreases. Therefore, the billet being pierced and rolled has an increased ellipticity of the cross-sectional shape, and the inclined roll The biting angle in the rotational direction to the angle increases. This expansion of the biting angle causes billet slip.
- the roll gorge rolling reduction ratio (GDF) is reduced, the roll interval “D2” is increased, so that the contact area between the inclined roll and the billet is reduced, and this also causes slip. Therefore, it is necessary to set an appropriate range for the roll gorge reduction rate so as not to cause a slip.
- the roll gorge reduction rate may be set to a range of 12% to 15%.
- Plug Shape In the manufacturing method of the present invention, it is preferable to use a plug having a shape satisfying the following expression (4). 1.8 ⁇ Pl / Pd (4) However, in the above formula (4), Pl: length from the tip of the plug to the maximum diameter position [mm], and Pd: maximum plug diameter [mm].
- Example 1 A test for piercing and rolling billets of carbon steel and 13% Cr steel was conducted using the piercing machine shown in FIG. At that time, billets of different steel types were employed in which the ratio “d / Bd” between the maximum diameter “d” and the billet diameter “Bd” in the inferior quality range was 0.05 to 0.15. Further, the piercing and rolling was performed by changing the plug tip reduction ratio (TDF) in the range of 0 to 0.03. Other test conditions are as follows.
- FIG. 4 is a diagram showing a situation where an internal crack occurs due to the correlation between d / Bd and TDF in piercing and rolling of carbon steel.
- FIG. 5 is a diagram showing a situation in which an internal crack occurs due to the correlation between d / Bd and TDF in the piercing and rolling of 13% Cr steel.
- Example 2 A test for piercing and rolling billets of carbon steel and 13% Cr steel was performed using the piercing machine shown in FIG. At that time, plugs having “Pl (plug rolled part length) / Pd (maximum plug diameter)” of 1.8 and 2 are adopted, and “Pl / Pd” is 1.6 for comparison. The thing was adopted. In any of the plugs, the piercing and rolling was performed by changing the plug tip reduction ratio (TDF) in the range of 0 to 0.03 that satisfies the relationship of the above formula (2). Other test conditions were the same as those in Example 1 described above.
- TDF plug tip reduction ratio
- Example 2 the biting property of the billet into the inclined roll was investigated during piercing and rolling. The biting property of the billet was evaluated based on whether or not a biting failure occurred. The survey results are shown in Table 2 below.
- the present invention can be effectively used for the production of seamless pipes by the Mannesmann pipe manufacturing method, and is useful for piercing and rolling when producing seamless pipes of all steel types.
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Abstract
Description
(1)穿孔機(ピアサ)により、所定温度に加熱された丸ビレットを穿孔圧延し、中空素管(ホローシェル)に成形する;
(2)延伸圧延機(例:マンドレルミル)により、中空素管を延伸圧延する;
(3)定径圧延機(例:ストレッチレデューサ)により、延伸圧延された中空素管を所定の外径と肉厚に定径圧延する。
TDF=1-(d1/Bd) …(a)
ただし、上記(a)式中、
Bd:ビレットの直径[mm]、および
d1:プラグ先端位置での傾斜ロールの間隔[mm]。
穿孔圧延の際に、ビレット内の中心偏析やポロシティに起因する内面疵の発生を確実に防止すること。
当該継目無管の製造方法は、ビレット横断面内で中心偏析およびポロシティからなる品質劣等領域の最大径がd[mm]である場合、下記の(1)式で表されるプラグ先端圧下比(TDF)が下記の(2)式を満足する条件で穿孔圧延を行うこと、
を特徴とする継目無管の製造方法。
TDF=(Bd-D1)/Bd …(1)
TDF≦-0.50×(d/Bd)+0.06 …(2)
ただし、上記(1)式および(2)式中、
Bd:ビレットの直径[mm]、および
D1:プラグ先端位置での傾斜ロールの間隔[mm]。
GDF=(Bd-D2)/Bd×100 …(3)
ただし、上記(3)式中、
Bd:ビレットの直径[mm]、および
D2:傾斜ロールのゴージ部の間隔[mm]。
1.8≦Pl/Pd …(4)
ただし、上記(4)式中、
Pl:プラグの先端から最大直径位置までの長さ[mm]、および
Pd:プラグの最大直径[mm]。
穿孔圧延の際に、ビレット内の中心偏析やポロシティの発生度合いの影響を考慮することにより、内面疵の発生を確実に防止できること。
図1は、本発明の継目無管の製造方法を適用できる穿孔機の構成例を模式的に示す上面図であり、図2は、その穿孔機の穿孔位置の周辺を模式的に示す側面図である。図1および図2に示すように、穿孔機10は、一対の傾斜ロール1と、プラグ2と、芯金3と、プッシャ4と、HMD(Hot Metal Detector)5とを備える。
本発明の継目無管の製造方法は、上記の穿孔機を用いてビレットを穿孔圧延するものである。以下にその方法の詳細を説明する。
図3は、本発明の継目無管の製造方法で採用する各種寸法を説明する模式図であり、図3(a)は穿孔圧延時の傾斜ロール、プラグおよびビレットの関係を示し、図3(b)はビレット内の品質劣等領域を示す。
TDF=(Bd-D1)/Bd …(1)
TDF≦-0.50×(d/Bd)+0.06 …(2)
ただし、上記(1)式および(2)式中、
Bd:ビレットの直径[mm]、および
D1:プラグ先端位置での傾斜ロールの間隔[mm](図3(a)参照)。
上述の通りに、上記(2)式の関係を満足するようにプラグ先端圧下比を低下させた場合、ビレット径に対してプラグ先端位置でのロール間隔が相対的に広がる。これに伴い、穿孔圧延の際に、傾斜ロールへのビレットの噛み込みが不安定になり、ロール噛み込み不良が生じるおそれがある。このロール噛み込み不良を防止するため、本発明の製造方法では、ビレットをプッシャにより押圧して傾斜ロールに噛み込ませた後、穿孔圧延が定常状態に達するまでプッシャによるビレットの押圧を継続することが好ましい。
本発明の製造方法では、下記の(3)式で表されるロールゴージ圧下率(GDF)が12%以上、15%以下の範囲となる条件で穿孔圧延を行うことが好ましい。
GDF=(Bd-D2)/Bd×100 …(3)
ただし、上記(3)式中、
Bd:ビレットの直径[mm]、および
D2:傾斜ロールのゴージ部の間隔[mm](前記図3(a)参照)。
本発明の製造方法では、下記の(4)式を満足する形状のプラグを用いることが好ましい。
1.8≦Pl/Pd …(4)
ただし、上記(4)式中、
Pl:プラグの先端から最大直径位置までの長さ[mm]、および
Pd:プラグの最大直径[mm]。
[試験方法]
前記図1に示す穿孔機を用い、炭素鋼および13%Cr鋼のビレットを穿孔圧延する試験を行った。その際、各鋼種のビレットとして、品質劣等領域の最大径「d」とビレット径「Bd」の比「d/Bd」が0.05~0.15の範囲で異なるものを採用した。また、穿孔圧延は、プラグ先端圧下比(TDF)を0~0.03の範囲で変更して行った。その他の試験条件は、下記の通りである。
・ビレットの加熱温度:1230℃
・傾斜ロールの交叉角10.0°、傾斜角11.0°
・ロールゴージ圧下率(GDF):13.3%
・プラグの形状:「Pl(プラグ圧延部長さ)/Pd(プラグ最大直径)」2
・プッシャによるビレットの押圧:穿孔圧延が定常状態に達するまで継続
・ホローシェルの寸法:外径196mm、肉厚16.87mm、長さ4970mm
穿孔圧延後、ホローシェルの内面を観察し、内面疵の発生状況を調査した。下記表1にその調査結果を示し、図4および図5に表1の結果をまとめる。
○:良。内面疵が認められなかったことを示す。
×:不可。内面疵が認められたことを示す。
表1、図4および図5に示す結果から次のことが示される。
[試験方法]
上記した実施例1と同様に前記図1に示す穿孔機を用い、炭素鋼および13%Cr鋼のビレットを穿孔圧延する試験を行った。その際、プラグとして、「Pl(プラグ圧延部長さ)/Pd(プラグ最大直径)」が1.8および2のものを採用し、さらに比較のために、「Pl/Pd」が1.6のものを採用した。いずれのプラグでも、プラグ先端圧下比(TDF)を上記(2)式の関係を満たす0~0.03の範囲で変更して穿孔圧延を行った。その他の試験条件は、上記した実施例1の場合と同様にした。
実施例2では、穿孔圧延の際に、傾斜ロールへのビレットの噛み込み性を調査した。そのビレットの噛み込み性は、噛み込み不良の発生有無で評価した。下記表2にその調査結果を示す。
○:良。噛み込み不良の発生がないことを示す。
×:不可。噛み込み不良が発生したことを示す。
表2に示す結果から次のことが示される。
4:プッシャ、 5:HMD(Hot Metal Detector)、
10:穿孔機、 20:ビレット、 21:品質劣等領域、
41:シリンダ本体、 42:シリンダロッド、
43:接続部材、 44:ビレット押し棒、 X:パスライン
Claims (4)
- パスラインに沿ってプッシャが入側に、プラグが出側にそれぞれ配設され、プラグの周りに複数の傾斜ロールが対向して配設された穿孔機を用いて、ビレットを穿孔圧延する継目無管の製造方法であって、
当該継目無管の製造方法は、ビレット横断面内で中心偏析およびポロシティからなる品質劣等領域の最大径がd[mm]である場合、下記の(1)式で表されるプラグ先端圧下比(TDF)が下記の(2)式を満足する条件で穿孔圧延を行うこと、
を特徴とする継目無管の製造方法。
TDF=(Bd-D1)/Bd …(1)
TDF≦-0.50×(d/Bd)+0.06 …(2)
ただし、上記(1)式および(2)式中、
Bd:ビレットの直径[mm]、および
D1:プラグ先端位置での傾斜ロールの間隔[mm]。 - ビレットをプッシャにより押圧して傾斜ロールに噛み込ませた後、穿孔圧延が定常状態に達するまでプッシャによるビレットの押圧を継続すること、
を特徴とする請求項1に記載の継目無管の製造方法。 - 下記の(3)式で表されるロールゴージ圧下率(GDF)が12%以上、15%以下の範囲となる条件で穿孔圧延を行うこと、
を特徴とする請求項1または2に記載の継目無管の製造方法。
GDF=(Bd-D2)/Bd×100 …(3)
ただし、上記(3)式中、
Bd:ビレットの直径[mm]、および
D2:傾斜ロールのゴージ部の間隔[mm]。 - 下記の(4)式を満足する形状のプラグを用いること、
を特徴とする請求項1~3のいずれかに記載の継目無管の製造方法。
1.8≦Pl/Pd …(4)
ただし、上記(4)式中、
Pl:プラグの先端から最大直径位置までの長さ[mm]、および
Pd:プラグの最大直径[mm]。
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EP11847768.6A EP2650060B1 (en) | 2010-12-08 | 2011-12-06 | Method for manufacturing seamless pipe |
US13/991,635 US9254511B2 (en) | 2010-12-08 | 2011-12-06 | Method for producing seamless tube/pipe |
BR112013012523A BR112013012523B8 (pt) | 2010-12-08 | 2011-12-06 | método para produzir tubo/cano sem costura |
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RU2614231C1 (ru) * | 2015-12-21 | 2017-03-23 | Открытое акционерное общество "Российский научно-исследовательский институт трубной промышленности" (ОАО "РосНИТИ") | Способ получения гильз |
RU2638468C1 (ru) * | 2016-08-23 | 2017-12-13 | Публичное акционерное общество "Северский трубный завод" (ПАО "СТЗ") | Способ винтовой прошивки заготовки |
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EP4091730B1 (en) * | 2020-01-14 | 2024-01-31 | Nippon Steel Corporation | Method for producing seamless metal tube |
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