EP0461734A1 - Verfahren zur Verbesserung der Beständigkeit von Gegenständen aus Stahl gegen H-induzierte Spannungsrisskorrosion - Google Patents
Verfahren zur Verbesserung der Beständigkeit von Gegenständen aus Stahl gegen H-induzierte Spannungsrisskorrosion Download PDFInfo
- Publication number
- EP0461734A1 EP0461734A1 EP91250125A EP91250125A EP0461734A1 EP 0461734 A1 EP0461734 A1 EP 0461734A1 EP 91250125 A EP91250125 A EP 91250125A EP 91250125 A EP91250125 A EP 91250125A EP 0461734 A1 EP0461734 A1 EP 0461734A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stress corrosion
- corrosion cracking
- induced stress
- articles
- objects
- 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.)
- Withdrawn
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 15
- 230000007797 corrosion Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005336 cracking Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 12
- 239000010959 steel Substances 0.000 title claims abstract description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title 1
- 229910052739 hydrogen Inorganic materials 0.000 title 1
- 239000001257 hydrogen Substances 0.000 title 1
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 7
- 239000000956 alloy Substances 0.000 claims abstract description 7
- 238000005496 tempering Methods 0.000 claims abstract description 5
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 238000005097 cold rolling Methods 0.000 claims abstract 2
- 238000001816 cooling Methods 0.000 claims abstract 2
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 229910000746 Structural steel Inorganic materials 0.000 abstract description 2
- 239000012736 aqueous medium Substances 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
Definitions
- the invention relates to a method for improving the resistance to H-induced stress corrosion cracking of objects made of low to medium-alloy structural steels according to the preamble of claim 1.
- the relevant technical regulations such as API-5CT or NACE MR-01-75 generally prescribe a stress relief anneal for steel pipes that are supposed to be acid gas resistant, which means that stress relief annealing is carried out again, which means that before the work hardening existing values can be achieved.
- Various methods can be used to test the resistance of steel pipes to H-induced stress corrosion cracking. For example, according to method D according to NACE standard TM0177-90, the test is carried out on prestressed samples in aqueous test solutions containing H2S, a certain minimum value of the critical fracture toughness K ISCC having to be achieved.
- a common value for oil field pipes of grade C90 is, for example, K ISCC ⁇ 30 ksi V in .
- the default values could still be achieved with the corresponding manufacturing processes, taking into account the above-mentioned influencing variables, with corresponding effort. Nevertheless, there is a desire to further increase the values that have been achievable so far, in order to be able to offer even greater safety both for production (reject risk) and for the use of such pipes.
- the present invention is therefore based on the object of further increasing the resistance of structural steel objects against H-induced stress corrosion cracking, the measures required for this, however, should only require little effort.
- the desired effect is achieved after just a few seconds of annealing - in some cases around two seconds are sufficient - that is, after a considerably shorter treatment time compared to the usual stress relieving (e.g. 30 min). It is essential that the temperature in this treatment is limited to an upper limit of a maximum of 30 K below A c1 for hot-rolled or TM-rolled or normalized objects or a maximum of 30 K below the tempering temperature last used for tempered objects.
- An annealing temperature in the range 580 to 640 o C, in particular of about 620 o C, has proven to be very useful for most low to medium alloy structural steels.
- the duration of the annealing treatment can generally be limited to significantly less than 2 minutes, often to about 5-20 seconds. Longer glow times no longer increase the resistance to H-induced stress corrosion cracking.
- the method according to the invention which is in principle also suitable for the production of sheets and profiles, can be used with particular advantage for the production of acid-gas-resistant, tempered oil-field and line pipes, since no complex system-technical precautions are necessary for the implementation.
- inductive heating is particularly useful, the heat treatment can also be e.g. in a heating furnace, which is usually part of the usual equipment of a pipe mill.
- the required energy expenditure is also small due to the relatively low temperatures and the short treatment time, so that the additional production costs are hardly significant and can be compensated for by reducing the reject rate.
- a seamless oil field pipe of grade C90 was made from the steel 29 Cr Mo 4 4 in a known manner by hot rolling and subsequent quenching and tempering.
- the material showed the following analysis:
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4019118A DE4019118C1 (enrdf_load_stackoverflow) | 1990-06-12 | 1990-06-12 | |
| DE4019118 | 1990-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0461734A1 true EP0461734A1 (de) | 1991-12-18 |
Family
ID=6408447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91250125A Withdrawn EP0461734A1 (de) | 1990-06-12 | 1991-05-07 | Verfahren zur Verbesserung der Beständigkeit von Gegenständen aus Stahl gegen H-induzierte Spannungsrisskorrosion |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5122198A (enrdf_load_stackoverflow) |
| EP (1) | EP0461734A1 (enrdf_load_stackoverflow) |
| DE (1) | DE4019118C1 (enrdf_load_stackoverflow) |
| NO (1) | NO911607L (enrdf_load_stackoverflow) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19821797C1 (de) * | 1998-05-15 | 1999-07-08 | Skf Gmbh | Verfahren zur Herstellung von gehärteten Teilen aus Stahl |
| USH1998H1 (en) | 1998-12-02 | 2001-11-06 | Caterpillar Inc. | Apparatus for accelerating the onset of wear related damage and distress on a circumferential cam surface |
| KR100625072B1 (ko) * | 2002-01-29 | 2006-09-19 | 가부시키가이샤 제이텍트 | 전동 파워스티어링 장치 |
| DE102016121902A1 (de) * | 2016-11-15 | 2018-05-17 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung von Fahrwerksteilen aus mikrolegiertem Stahl mit verbesserter Kaltumformbarkeit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0064730A2 (en) * | 1981-05-08 | 1982-11-17 | Lone Star Steel Company | High performance tubulars for critical oil country applications and process for their preparation |
| GB2155950A (en) * | 1984-03-01 | 1985-10-02 | Nippon Steel Corp | ERW-oil well pipe and process for producing same |
| EP0160616A2 (de) * | 1984-04-24 | 1985-11-06 | MANNESMANN Aktiengesellschaft | Verwendung eines Stahls in schwefelwasserstoffhaltiger Atmosphäre |
| EP0224591A1 (en) * | 1985-05-23 | 1987-06-10 | Kawasaki Steel Corporation | Process for producing high-strength seamless steel pipes excellent in sulfide stress corrosion cracking resistance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947293A (en) * | 1972-01-31 | 1976-03-30 | Nippon Steel Corporation | Method for producing high-strength cold rolled steel sheet |
| US3830669A (en) * | 1972-06-13 | 1974-08-20 | Sumitomo Metal Ind | Process for manufacturing a cold-rolled high strength steel sheet |
| JPS52128821A (en) * | 1976-04-12 | 1977-10-28 | Nippon Steel Corp | Preparation of high tensile steel having superior low temperature toughness and yield point above 40 kg/pp2 |
| JPH075983B2 (ja) * | 1987-04-16 | 1995-01-25 | 日本鋼管株式会社 | リ−ドフレ−ム用フエライト系ステンレス鋼の製造方法 |
-
1990
- 1990-06-12 DE DE4019118A patent/DE4019118C1/de not_active Expired - Lifetime
-
1991
- 1991-04-23 NO NO91911607A patent/NO911607L/no unknown
- 1991-05-07 EP EP91250125A patent/EP0461734A1/de not_active Withdrawn
- 1991-06-12 US US07/713,804 patent/US5122198A/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0064730A2 (en) * | 1981-05-08 | 1982-11-17 | Lone Star Steel Company | High performance tubulars for critical oil country applications and process for their preparation |
| GB2155950A (en) * | 1984-03-01 | 1985-10-02 | Nippon Steel Corp | ERW-oil well pipe and process for producing same |
| EP0160616A2 (de) * | 1984-04-24 | 1985-11-06 | MANNESMANN Aktiengesellschaft | Verwendung eines Stahls in schwefelwasserstoffhaltiger Atmosphäre |
| EP0224591A1 (en) * | 1985-05-23 | 1987-06-10 | Kawasaki Steel Corporation | Process for producing high-strength seamless steel pipes excellent in sulfide stress corrosion cracking resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| NO911607D0 (no) | 1991-04-23 |
| NO911607L (no) | 1991-12-13 |
| US5122198A (en) | 1992-06-16 |
| DE4019118C1 (enrdf_load_stackoverflow) | 1991-04-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE DK FR GB IT LU NL |
|
| 17P | Request for examination filed |
Effective date: 19911126 |
|
| 17Q | First examination report despatched |
Effective date: 19931109 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19950531 |