EP0705908B1 - Acier C-Mn faiblement allié - Google Patents

Acier C-Mn faiblement allié Download PDF

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Publication number
EP0705908B1
EP0705908B1 EP95250205A EP95250205A EP0705908B1 EP 0705908 B1 EP0705908 B1 EP 0705908B1 EP 95250205 A EP95250205 A EP 95250205A EP 95250205 A EP95250205 A EP 95250205A EP 0705908 B1 EP0705908 B1 EP 0705908B1
Authority
EP
European Patent Office
Prior art keywords
steel
weight
content
maximum
titanium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95250205A
Other languages
German (de)
English (en)
Other versions
EP0705908A2 (fr
EP0705908A3 (fr
Inventor
Bernhard Koschlig
Wilhelm Nickel
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0705908A2 publication Critical patent/EP0705908A2/fr
Publication of EP0705908A3 publication Critical patent/EP0705908A3/en
Application granted granted Critical
Publication of EP0705908B1 publication Critical patent/EP0705908B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • the invention relates to a low-alloy C-Mn steel for steel pipes, in particular for the oil and gas industry according to the generic term of the main claim.
  • the steel specified in the generic term with a C content in percent by weight between 0.20 to 0.40 and a manganese content between 1.0 to 2.0 and one optional addition of chromium, molybdenum and vanadium is preferred with Aluminum but also in combination with titanium soothes. With usual Aluminum contents of 0.025 to 0.035 tend to solidify when solidifying Hot cracking, especially when casting blocks. But also shows continuous casting as primary material this appearance.
  • Hot cracks are formed in the temperature range just below solidus if they are present local voltage peaks. Tensions in the cast skin arise from the Reduction of the specific volume of the steel with falling temperature. she are greater, the steeper the temperature gradient during solidification, the greater the specific solid shrinkage of the metal and the wider the solidification interval the alloy is.
  • Crucial to avoiding hot cracks is the ability of the steel to absorb the resulting tensions or reduce them through permanent deformation.
  • the strength of the cast skin is primarily determined by its temperature. But the alloy composition also has an influence on the hot cracking behavior.
  • a steel casting is known from EP-A-589435, the melt of which has the following composition (% by weight): 0.04-0.20% C, 0.05-0.50% Si, 0.4-2.0% Mn, 0.3-0.7% Mo, 0.003-0.015% N, 0.04.0, 20% V, 0.005-0.025% Ti, balance Fe.
  • Aluminum is added to achieve a final concentration of 0.005 to 0.015% Al.
  • JP-A-1283 322 is a high-strength steel for petroleum pipes with the following Composition known (wt%): 0.15-0.45% C, 0.10-1.0% Si, 0.3-1.8% Mn, ⁇ 0.01 % AL, 0.005-0.1% Ti, and 0.01-0.2% Zr (individually or both), at least one component from the group of 0.05-2% Cr, 0.02-0.8% Mo, 0.005-0.20% Nb, 0.005-0.2% V and 0.0001-0.003% B, remainder Fe.
  • Composition known wt%: 0.15-0.45% C, 0.10-1.0% Si, 0.3-1.8% Mn, ⁇ 0.01 % AL, 0.005-0.1% Ti, and 0.01-0.2% Zr (individually or both), at least one component from the group of 0.05-2% Cr, 0.02-0.8% Mo, 0.005-0.20% Nb, 0.005-0.2% V and 0.0001-0.003% B, remainder Fe.
  • the object of the invention is to provide a low-alloy C-Mn steel which regardless of whether cast as a block or continuous casting, only a small one Shows susceptibility to hot cracking.
  • This task is done with a steel of the generic chemical type Composition solved, the aluminum content to max. 0.015% by weight at one Minimum content of 0.005% by weight and with the simultaneous addition of 0.007 to 0.025 % Titanium is limited.
  • a steel according to the invention with the standard designation P32MnCrV6 was used as a block poured and the hot crack sensitivity examined using the Gleeble test.
  • Round samples of 145 x 10 mm were made from the block manufactured and then clamped in the Gleeble machine. The samples showed themselves at 1350 ° C test temperature a fracture necking of 96% and in the Micrographs showed no signs of melting. The one with this Pipes made of steel on a plug mill had no defects whatsoever would have been due to hot cracks in the block.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Heat Treatment Of Articles (AREA)
  • Body Structure For Vehicles (AREA)

Claims (4)

  1. Acier C-Mn faiblement allié pour des tubes en acier, en particulier pour l'industrie du pétrole et du gaz naturel, ayant une composition chimique en pourcentage pondéral de C = 0,20-0,40 ; Si = 0,15-0,45 ; Mn = 1,0-2,0 ; P≤ 0,015 ; S ≤ 0,010, avec un ajout au choix de Cr = 0,25-1,5 ; Mo = 0,15-0,50 ; V = 0,04-0,10 individuellement ou ensemble jusqu'à un maximum de 2,1, ainsi qu'un ajout de Al et Ti pour calmer l'acier et des quantités déterminées d'azote et d'oxygène combiné et dissous et des impuretés inévitables, le restant étant du fer,
    caractérisé en ce que, pour diminuer la sensibilité aux fissures à chaud lors de la solidification, la teneur en aluminium est limitée à un maximum de 0,015% en poids pour une teneur minimale de 0,005% en poids et pour un ajout simultané de 0,007 à 0,025% en poids de titane.
  2. Acier selon la revendication 1,
    caractérisé en ce que la teneur en titane vaut entre 0,01 et 0,025% en poids.
  3. Acier selon les revendications 1 et 2,
    caractérisé en ce que la teneur en soufre est limitée à un maximum de 0,005% en poids.
  4. Acier selon les revendications précédentes 1 à 3,
    caractérisé en ce que la teneur en azote est inférieure à 0,0100% en poids.
EP95250205A 1994-09-02 1995-08-20 Acier C-Mn faiblement allié Expired - Lifetime EP0705908B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4432390 1994-09-02
DE4432390A DE4432390C2 (de) 1994-09-02 1994-09-02 Verfahren zur Senkung der Heißrißanfälligkeit bei der Herstellung eines niedriglegierten C-Mn-Stahles

Publications (3)

Publication Number Publication Date
EP0705908A2 EP0705908A2 (fr) 1996-04-10
EP0705908A3 EP0705908A3 (fr) 1996-05-22
EP0705908B1 true EP0705908B1 (fr) 1999-04-28

Family

ID=6527991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95250205A Expired - Lifetime EP0705908B1 (fr) 1994-09-02 1995-08-20 Acier C-Mn faiblement allié

Country Status (5)

Country Link
EP (1) EP0705908B1 (fr)
AT (1) ATE179461T1 (fr)
BR (1) BR9503886A (fr)
DE (2) DE4432390C2 (fr)
ES (1) ES2130525T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2128240B1 (es) * 1996-07-26 2000-01-01 Gsb Grupo Siderurgico Vasco S Procedimiento de fabricacion de aceros microaleados.
CN114606443B (zh) * 2022-03-17 2022-08-09 襄阳金耐特机械股份有限公司 一种高淬透性铸钢

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155950B (en) * 1984-03-01 1988-01-20 Nippon Steel Corp Erw-oil well pipe and process for producing same
JPS63230819A (ja) * 1987-03-20 1988-09-27 Sumitomo Metal Ind Ltd 耐食性に優れた油井管用鋼の製造方法
JPH01283322A (ja) * 1988-05-10 1989-11-14 Sumitomo Metal Ind Ltd 耐食性に優れた高強度油井管の製造方法
JPH0320443A (ja) * 1989-06-15 1991-01-29 Sumitomo Metal Ind Ltd 耐ｓｓｃｃ性に優れた高強度油井管およびその製造方法
GB9116412D0 (en) * 1990-08-03 1991-09-11 Samsung Heavy Ind High toughness non-refined steels and method for manufacturing them
JP2661845B2 (ja) * 1992-09-24 1997-10-08 新日本製鐵株式会社 含オキサイド系耐火用形鋼の制御圧延による製造方法
JPH06116635A (ja) * 1992-10-02 1994-04-26 Kawasaki Steel Corp 耐硫化物応力腐食割れ性に優れた高強度低合金油井用鋼の製造方法

Also Published As

Publication number Publication date
EP0705908A2 (fr) 1996-04-10
EP0705908A3 (fr) 1996-05-22
DE59505760D1 (de) 1999-06-02
BR9503886A (pt) 1996-09-17
DE4432390C2 (de) 1998-03-26
ATE179461T1 (de) 1999-05-15
DE4432390A1 (de) 1996-03-07
ES2130525T3 (es) 1999-07-01

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