JPH07207410A - Seamless steel pipe having excellent sour resistance - Google Patents
Seamless steel pipe having excellent sour resistanceInfo
- Publication number
- JPH07207410A JPH07207410A JP2185394A JP2185394A JPH07207410A JP H07207410 A JPH07207410 A JP H07207410A JP 2185394 A JP2185394 A JP 2185394A JP 2185394 A JP2185394 A JP 2185394A JP H07207410 A JPH07207410 A JP H07207410A
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- Prior art keywords
- less
- steel pipe
- seamless steel
- test
- sour resistance
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は耐サワー性に優れた継目
無鋼管に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seamless steel pipe having excellent sour resistance.
【０００２】[0002]
【従来の技術】従来、継目無鋼管の製造方法において、
耐ＨＩＣ（Hydrogen Induced Cracking ：水素誘起割
れ）特性、耐ＳＣＣ（Stress Corrosion Cracking ：応
力腐食割れ）特性等の耐サワー特性を高めるために、鋼
中の硫黄含有量を0.003 ％以下にし、更にＣａを添加す
るものが提案されている。2. Description of the Related Art Conventionally, in a method for producing a seamless steel pipe,
In order to enhance sour resistance characteristics such as HIC (Hydrogen Induced Cracking) characteristics and SCC (Stress Corrosion Cracking) characteristics, the sulfur content in the steel is set to 0.003% or less, and Ca is further reduced. Something to add is proposed.
【０００３】[0003]
【発明が解決しようとする課題】然しながら、従来技術
には、下記〜の問題点がある。 硫黄含有量を0.003 ％以下にするためには溶鋼精練過
程で特別な脱硫処理が必要になり、その分製作コストが
高くなる。However, the prior art has the following problems. In order to reduce the sulfur content to 0.003% or less, special desulfurization treatment is required in the molten steel refining process, which increases the production cost.
【０００４】Ｃａは、溶鋼中に添加されるものである
が、添加時にダストを生成し溶鋼精練の作業環境を著し
く劣化させる。Ca, which is added to molten steel, produces dust during addition and significantly deteriorates the working environment of molten steel refining.
【０００５】Ｃａは、鋼中含有量の制御が難しく、目
的に適う含有量の部分のみを使い分けるためのロスが、
他の元素の場合に較べて、大きく、その分製作コストが
高くなる。It is difficult to control the content of Ca in the steel, and there is a loss in using only the portion of the content that suits the purpose.
Compared with other elements, it is larger and the manufacturing cost is higher accordingly.
【０００６】本発明は、耐ＨＩＣ特性、耐ＳＣＣ特性等
の耐サワー特性に優れた継目無鋼管を提供することを目
的とする。It is an object of the present invention to provide a seamless steel pipe having excellent sour resistance such as HIC resistance and SCC resistance.
【０００７】[0007]
【課題を解決するための手段】請求項１に記載の本発明
は、炭素を0.03％以上0.25％以下、ケイ素を0.02％以上
0.40％以下、マンガンを0.50％以上1.80％以下、硫黄を
0.005 ％以下、クロムを0.30％以上2.0 ％以下の範囲で
含有し、残部鉄及び不可避的不純物よりなる鋼を、継目
無鋼管製造プロセスにより継目無鋼管となしたものであ
る。According to the present invention as set forth in claim 1, carbon is 0.03% or more and 0.25% or less, and silicon is 0.02% or more.
0.40% or less, manganese 0.50% or more and 1.80% or less, sulfur
A steel containing 0.005% or less, chromium in the range of 0.30% or more and 2.0% or less, and the balance of iron and unavoidable impurities is made into a seamless steel pipe by a seamless steel pipe manufacturing process.
【０００８】請求項２に記載の本発明は、請求項１に記
載の鋼に下記の元素の一種又は二種以上を添加した鋼
を、継目無鋼管製造プロセスにより継目無鋼管となした
ものである。The present invention according to claim 2 is a steel obtained by adding one or more of the following elements to the steel according to claim 1 into a seamless steel pipe by a seamless steel pipe manufacturing process. is there.
【０００９】バナジウム0.005 ％以上0.080 ％以下、モ
リブデン0.005 ％以上0.200 ％以下、ニオブ0.005 ％以
上0.080 ％以下、銅0.03％以上0.5 ％以下、ニッケル0.
03％以上0.5 ％以下、チタニウム0.05％以上0.030 ％以
下Vanadium 0.005% or more and 0.080% or less, molybdenum 0.005% or more and 0.200% or less, niobium 0.005% or more and 0.080% or less, copper 0.03% or more and 0.5% or less, nickel 0.
03% or more and 0.5% or less, titanium 0.05% or more and 0.030% or less
【００１０】請求項３に記載の本発明は、請求項１又は
２に記載の継目無鋼管に、所定の強度或いは靱性を付与
するために、焼きならし或いは焼き入れ−焼き戻しの熱
処理を施したものである。According to a third aspect of the present invention, the seamless steel pipe according to the first or second aspect is subjected to normalizing or heat treatment of quenching-tempering in order to impart predetermined strength or toughness. It was done.
【００１１】[0011]
【作用】本発明によれば、鋼中にＣｒを0.3 ％以上2.0
％以下の範囲で添加することによって、ＮＡＣＥ Stand
ard ＴＭ-02-84に従うＨＩＣテストを行なってもＨＩＣ
が発生せず、かつＮＡＣＥ Standard ＴＭ-01-77のTest
Method Ａに従うＳＣＣテストを応力レベル80％ＳＭＹ
Ｓ（被験材料の降伏応力の規定下限値の80％の応力）以
上の条件下で行ってもＳＣＣが発生しない継目無鋼管を
得ることができる。According to the present invention, 0.3% to 2.0% of Cr is contained in steel.
%, The NACE Stand
HIC according to ard TM-02-84
Does not occur, and Test of NACE Standard TM-01-77
SCC test according to Method A, stress level 80% SMY
It is possible to obtain a seamless steel pipe in which SCC does not occur even under the condition of S (80% stress of the specified lower limit value of the yield stress of the test material) or more.
【００１２】このとき、従来技術におけるような硫黄含
有量を0.003 ％以下の如くに低減する必要がないから、
溶鋼精練過程で特別な脱硫処理が必要でなく、製作コス
トを低くできる。また、従来技術におけるようなＣａの
添加がないから、溶鋼精練の作業環境を劣化させること
がなく、また鋼中におけるＣａ含有量の制御の困難性に
起因する製作コストの上昇もない。At this time, since it is not necessary to reduce the sulfur content to 0.003% or less as in the prior art,
No special desulfurization treatment is required in the molten steel refining process, and the manufacturing cost can be reduced. Further, since Ca is not added as in the conventional technique, the working environment for molten steel refining is not deteriorated, and the production cost is not increased due to the difficulty of controlling the Ca content in steel.
【００１３】然るに、本発明において鋼の元素含有量を
規定した理由は以下の如くである。However, the reason for defining the element content of steel in the present invention is as follows.
【００１４】炭素：0.03％以上0.25％以下 炭素は鋼に強度を付与するために添加するものである
が、その添加量が0.03％未満では強度向上に効果が無
く、0.25％を超えて添加されると鋼の靱性及び溶接性が
損なわれるので、0.03％を添加量の下限、0.25％を添加
量の上限とする。Carbon: 0.03% or more and 0.25% or less Carbon is added to give strength to steel, but if the addition amount is less than 0.03%, it has no effect on strength improvement, and it is added in excess of 0.25%. If so, the toughness and weldability of the steel will be impaired, so 0.03% is the lower limit of the amount added and 0.25% is the upper limit of the amount added.
【００１５】ケイ素：0.02％以上0.40％以下 ケイ素は脱酸或いは強度付与の目的で添加されるもの。
0.02％未満では脱酸、強度付与ともに効果が無く、0.40
％を超えて添加されると鋼の清浄度が損なわれるし、靱
性、溶接性が損なわれる。Silicon: 0.02% to 0.40% Silicon is added for the purpose of deoxidizing or imparting strength.
If it is less than 0.02%, there is no effect on deoxidation and strength addition, and 0.40
%, The cleanliness of steel is impaired, and the toughness and weldability are impaired.
【００１６】マンガン：0.50％以上1.80％以下 マンガンは、鋼に強度を付与するために添加するもの。
0.50％未満では強度向上に効果が無く、1.80％を超えて
添加されると鋼の清浄度が劣化するし溶接性も損なわれ
る。Manganese: 0.50% or more and 1.80% or less Manganese is added to impart strength to steel.
If it is less than 0.50%, there is no effect in improving the strength, and if it exceeds 1.80%, the cleanliness of the steel deteriorates and the weldability also deteriorates.
【００１７】硫黄：0.005 ％以下 硫黄は不純物として鋼中に存在するもの。鋼の耐サワー
特性、靱性などを向上させるためには、少ない程好まし
いが、0.005 ％以下特に0.003 ％以下にするためには溶
鋼精練過程で特別な脱硫処理が必要になり、製作コスト
の上昇をきたす。本発明鋼の場合硫黄含有量0.005 ％で
も所定の耐サワー特性が得られるので、0.005 ％を上限
とする。Sulfur: 0.005% or less Sulfur is present in steel as an impurity. In order to improve the sour resistance and toughness of steel, the smaller the amount, the better. However, in order to achieve 0.005% or less, especially 0.003% or less, special desulfurization treatment is required in the molten steel refining process, which increases the manufacturing cost. Come here. In the case of the steel of the present invention, even if the sulfur content is 0.005%, the predetermined sour resistance can be obtained, so the upper limit is 0.005%.
【００１８】クロム：0.30％以上2.0 ％以下 クロムは本発明鋼に必須の元素。0.30％未満では耐サワ
ー特性向上効果はなく、2.0 ％を超えて添加されると鋼
の溶接性が損なわれる。Chromium: 0.30% to 2.0% Chromium is an essential element for the steel of the present invention. If it is less than 0.30%, there is no sour resistance improving effect, and if it exceeds 2.0%, the weldability of steel is impaired.
【００１９】バナジウム：0.005 ％以上0.080 ％以下 バナジウムは、強度付与のために添加するもの。0.005
％未満では、強度向上効果が無い。0.080 ％を超えて添
加されると溶接性が劣化する。Vanadium: 0.005% or more and 0.080% or less Vanadium is added to impart strength. 0.005
If it is less than%, there is no strength improving effect. If added in excess of 0.080%, the weldability will deteriorate.
【００２０】モリブデン：0.005 ％以上0.200 ％以下 モリブデンは強度付与のために添加するものであり、0.
005 ％未満では強度向上効果がなく、0.200 ％を超えて
添加されると溶接性が損なわれる。Molybdenum: 0.005% or more and 0.200% or less Molybdenum is added to give strength.
If it is less than 005%, there is no strength improving effect, and if it is added in excess of 0.200%, the weldability is impaired.
【００２１】ニオブ：0.005 ％以上0.080 ％以下 ニオブは強度付与のために添加するものであり、0.005
％未満では強度向上効果がなく、0.080 ％を超えて添加
されると溶接性が損なわれる。Niobium: 0.005% or more and 0.080% or less Niobium is added for the purpose of imparting strength.
If it is less than 0.1%, there is no effect of improving the strength, and if it exceeds 0.080%, the weldability is impaired.
【００２２】銅：0.03％以上0.5 ％以下 銅は強度付与のために添加するものであり、0.03％未満
では強度向上効果が無く、0.5 ％を超えて添加されると
溶接性が損なわれる。Copper: 0.03% or more and 0.5% or less Copper is added to impart strength. If it is less than 0.03%, there is no strength improving effect, and if it exceeds 0.5%, weldability is impaired.
【００２３】ニッケル：0.03％以上0.5 ％以下 ニッケルは強度付与のために添加するものであり、0.03
％未満では強度向上効果が無く、0.5 ％を超えて添加さ
れると溶接性が損なわれる。Nickel: 0.03% or more and 0.5% or less Nickel is added to give strength.
If it is less than 0.5%, there is no strength improving effect, and if it exceeds 0.5%, the weldability is impaired.
【００２４】チタニウム：0.005 ％以上0.030 ％以下 チタニウムは強度付与のために添加するものであり、0.
005 ％未満では強度向上効果が無く、0.030 ％を超えて
添加されると溶接性が損なわれる。Titanium: 0.005% or more and 0.030% or less Titanium is added to impart strength.
If it is less than 005%, there is no strength improving effect, and if it is added in excess of 0.030%, the weldability is impaired.
【００２５】尚、本発明の実施において採用される継目
無鋼管製造プロセスとしては、マンネスマン／プラグミ
ル方式、或いはマンネスマン／マンドレルミル方式等を
広く採用できる。As a seamless steel pipe manufacturing process adopted in the practice of the present invention, a Mannesmann / plug mill system or a Mannesmann / mandrel mill system can be widely adopted.
【００２６】[0026]
グレード：ＡＰＩ5 ＬＸ60 寸法：外径273mm ×厚13mmの継目無鋼管を本発明により
製造した。 ここで、本発明鋼の化学成分は表１の如くである。Grade: API5 LX60 Dimension: Seamless steel pipe having an outer diameter of 273 mm and a thickness of 13 mm was manufactured according to the present invention. Here, the chemical composition of the steel of the present invention is as shown in Table 1.
【００２７】[0027]
【表１】 [Table 1]
【００２８】また、継目無鋼管は、強度、靱性を付与す
るため、焼き入れ−焼き戻しを施した。Further, the seamless steel pipe was quenched and tempered in order to impart strength and toughness.
【００２９】このようにして製造した継目無鋼管の機械
的性質は以下の如くである。 (A) 引張試験結果The mechanical properties of the seamless steel pipe manufactured as described above are as follows. (A) Tensile test results
【００３０】[0030]
【表２】 [Table 2]
【００３１】試験片：ＡＰＩ5 Ｌ標準矩形試験片Test piece: API 5 L standard rectangular test piece
【００３２】(B) ＳＣＣ試験結果 (B-1) ４点曲げ法によるＳＣＣ試験 (1) 試験片の方向 パイプ軸方向(B) SCC test result (B-1) SCC test by 4-point bending method (1) Direction of test piece Pipe axial direction
【００３３】(2) 試験片の寸法 厚：5mm 幅：15mm 長さ：115mm 試験片はパイプの内表面から採取された。(2) Dimensions of test piece Thickness: 5 mm Width: 15 mm Length: 115 mm The test piece was taken from the inner surface of the pipe.
【００３４】(3) 試験液 ＮＡＣＥ ＴＭ-01-77による。(3) Test liquid According to NACE TM-01-77.
【００３５】(4) 付加応力 ＳＭＹＳ（被験材料の降伏応力の規定下限値）の80％、
90％、100 ％ パイプの内表面側を曲げの外側とする。各応力レベルで
各３個の試験片をテストした。(4) Additional stress 80% of SMYS (specified lower limit of yield stress of test material),
90%, 100% The inside surface of the pipe is the outside of the bend. Three test pieces each were tested at each stress level.
【００３６】(5) 試験期間 96時間(5) Test period 96 hours
【００３７】(6) 試験結果 全試験片が非破断であることを認めた。(6) Test results It was confirmed that all the test pieces were non-breakable.
【００３８】(B-2) 定荷重法（ＮＡＣＥ ＴＭ-01-77の
方法Ａ）によるＳＣＣ試験 (1) 試験片の方向 パイプ軸方向(B-2) SCC test by constant load method (method A of NACE TM-01-77) (1) Direction of test piece Pipe axial direction
【００３９】(2) 試験片の寸法 ＮＡＣＥ ＴＭ-01-77の標準寸法（直径6.4mm ）(2) Dimensions of test piece Standard dimensions of NACE TM-01-77 (diameter 6.4 mm)
【００４０】(3) 試験液 ＮＡＣＥ ＴＭ-01-77による。(3) Test liquid According to NACE TM-01-77.
【００４１】(4) 付加応力 ＳＭＹＳの80％、90％(4) Additional stress 80%, 90% of SMYS
【００４２】(5) 試験期間 720 時間(5) Test period 720 hours
【００４３】(6) 試験結果 全試験片が非破断であることを認めた。(6) Test results It was confirmed that all the test pieces were non-breakable.
【００４４】(C) ＨＩＣ試験結果 (1) 試験液(C) HIC test results (1) Test solution
【００４５】[0045]
【表３】 [Table 3]
【００４６】(2) 試験期間 96時間(2) Test period 96 hours
【００４７】(3) 他の試験条件 ＮＡＣＥ ＴＭ-02-84による(3) Other test conditions According to NACE TM-02-84
【００４８】(4) 試験結果 試験結果は表４の通りである。(4) Test results Table 4 shows the test results.
【００４９】[0049]
【表４】 [Table 4]
【００５０】[0050]
【発明の効果】以上のように本発明によれば、耐ＨＩＣ
特性、耐ＳＣＣ特性等の耐サワー特性に優れた継目無鋼
管を得ることができる。As described above, according to the present invention, the HIC resistance is high.
It is possible to obtain a seamless steel pipe having excellent sour resistance such as characteristics and SCC resistance.
Claims (3)
0.02％以上0.40％以下、マンガンを0.50％以上1.80％以
下、硫黄を0.005 ％以下、クロムを0.30％以上2.0 ％以
下の範囲で含有し、残部鉄及び不可避的不純物よりなる
鋼を、継目無鋼管製造プロセスにより継目無鋼管となし
た耐サワー性に優れた継目無鋼管。1. A carbon content of 0.03% to 0.25% and a silicon content of
Steel containing 0.02% or more and 0.40% or less, manganese 0.50% or more and 1.80% or less, sulfur 0.005% or less, chromium 0.30% or more and 2.0% or less, and the balance iron and unavoidable impurities A seamless steel pipe with excellent sour resistance that was made into a seamless steel pipe by the manufacturing process.
又は二種以上を添加した鋼を、継目無鋼管製造プロセス
により継目無鋼管となした耐サワー性に優れた継目無鋼
管。バナジウム0.005 ％以上0.080 ％以下、モリブデン
0.005 ％以上0.200 ％以下、ニオブ0.005 ％以上0.080
％以下、銅0.03％以上0.5 ％以下、ニッケル0.03％以上
0.5 ％以下、チタニウム0.05％以上0.030 ％以下2. A seamless steel pipe having excellent sour resistance, which is made by adding one or more of the following elements to the steel according to claim 1 into a seamless steel pipe by a seamless steel pipe manufacturing process. Vanadium 0.005% to 0.080%, molybdenum
0.005% to 0.200%, niobium 0.005% to 0.080
% Or less, copper 0.03% or more and 0.5% or less, nickel 0.03% or more
0.5% or less, titanium 0.05% or more and 0.030% or less
所定の強度或いは靱性を付与するために、焼きならし或
いは焼き入れ−焼き戻しの熱処理を施した継目無鋼管。3. The seamless steel pipe according to claim 1 or 2,
A seamless steel tube that has been subjected to normalizing or quenching-tempering heat treatment to impart predetermined strength or toughness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2185394A JPH07207410A (en) | 1994-01-24 | 1994-01-24 | Seamless steel pipe having excellent sour resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2185394A JPH07207410A (en) | 1994-01-24 | 1994-01-24 | Seamless steel pipe having excellent sour resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07207410A true JPH07207410A (en) | 1995-08-08 |
Family
ID=12066676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2185394A Withdrawn JPH07207410A (en) | 1994-01-24 | 1994-01-24 | Seamless steel pipe having excellent sour resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07207410A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430901A (en) * | 2011-12-14 | 2012-05-02 | 宝鸡石油钢管有限责任公司 | P110 steel level high frequency straight welded pipe manufacturing method |
-
1994
- 1994-01-24 JP JP2185394A patent/JPH07207410A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430901A (en) * | 2011-12-14 | 2012-05-02 | 宝鸡石油钢管有限责任公司 | P110 steel level high frequency straight welded pipe manufacturing method |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010403 |