EP0566814A1 - Superduplex stainless steel having high corrosion resistance and high yield strength in the solution annealed condition - Google Patents
Superduplex stainless steel having high corrosion resistance and high yield strength in the solution annealed condition Download PDFInfo
- Publication number
- EP0566814A1 EP0566814A1 EP92830586A EP92830586A EP0566814A1 EP 0566814 A1 EP0566814 A1 EP 0566814A1 EP 92830586 A EP92830586 A EP 92830586A EP 92830586 A EP92830586 A EP 92830586A EP 0566814 A1 EP0566814 A1 EP 0566814A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- max
- corrosion resistance
- stainless steel
- yield strength
- solution annealed
- 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.)
- Granted
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
Definitions
- Austenitic/Ferritic stainless steels presently on the market are those reported in the ASTM A790 specification with the addition of the Zeron 100, equivalent to UNS S32760, which is not yet included in the ASTM specification.
- the steel grades which are mainly requested for the oil field applications are the UNS S32750 and UNS S32760.
- the A.O.D. refining allows a deep deoxydation and desulphurization of the steel as well as to reach the required chemical composition in a repeatable way.
- the analytical balancing of the alloying elements Cr, Mo, W, Cu and N is very important for obtaining the mechanical properties and the corrosion resistance on hot forged and/or rolled products in the solution annealed condition.
- Our invention has taken advantage of the combined action of Mo, W, Cu, N which allows to reach a yield strength value higher than 620 MPa (90,000 PSI) as well as a generalized resistance to the stress corrosion, to the pitting and crevice corrosions.
- the optimized chemical composition is the following : (weight in percent) C 0.025 max Mn 0.80 max Si 0.80 max Cr 24 - 26 Ni 6.5 - 8.0 Mo 3.0 - 4.0 S 0.002 max P 0.025 max Cu 1.2 - 2.0 W 0.80 - 1.2 N 0.23 - 0.33 Fe balance
- a B C weight loss (g/m2) 0.049 0.070 0.76 N° of pitting/m2 0 0 270 Max pit depth (micron) 0 0 100 Critical Pitting Temp.(°C) 80 60 50 2.3 Corrosion resistance in 5% Na Cl at PH 4 - 6 at 600 mV : A B C CPT (°C) 80 72 63 2.4 Crevice corrosion resistance (ASTM G78 modified) 100 days .
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- 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 Articles (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
C 0.025 max
Mn 0.80 max
Si 0.80 max
Cr 24 - 26
Ni 6.5 - 8.0
Mo 3.0 - 4.0
Cu 1.2 - 2.0
W 0.8 - 1.2
N 0.23 - 0.33
S 0.002 max
P 0.025 max
Fe balance
with the proviso: Pitting Index = Cr + 3.3 Mo + 16N > 42
Description
- The Austenitic/Ferritic stainless steels presently on the market are those reported in the ASTM A790 specification with the addition of the Zeron 100, equivalent to UNS S32760, which is not yet included in the ASTM specification.
- The steel grades which are mainly requested for the oil field applications are the UNS S32750 and UNS S32760.
- There are however many other kind of steels which can be included in the same class and which are listed and described in the following publications :
- Encl. 1 -
- Superduplex Stainless Steel : Structure and Properties. by J. Charles
- Encl. 2 -
- Superduplex Stainless Steel : Structure and Properties. by J. Charles
- Encl. 3 -
- The Corrosion Resistance of Duplex Stainless Steel. by S. Bernhardsson
- The A.O.D. refining allows a deep deoxydation and desulphurization of the steel as well as to reach the required chemical composition in a repeatable way.
- The analytical balancing of the alloying elements Cr, Mo, W, Cu and N is very important for obtaining the mechanical properties and the corrosion resistance on hot forged and/or rolled products in the solution annealed condition.
- Our invention has taken advantage of the combined action of Mo, W, Cu, N which allows to reach a yield strength value higher than 620 MPa (90,000 PSI) as well as a generalized resistance to the stress corrosion, to the pitting and crevice corrosions.
- The optimized chemical composition is the following :
(weight in percent)C 0.025 max Mn 0.80 max Si 0.80 max Cr 24 - 26 Ni 6.5 - 8.0 Mo 3.0 - 4.0 S 0.002 max P 0.025 max Cu 1.2 - 2.0 W 0.80 - 1.2 N 0.23 - 0.33 Fe balance - The ferrite on the product solution annealed at the temperature of 1070 - 1100°C is 40 - 55%
1. Mechanical characteristics of the product solution annealed at 1080 °C :
2. Comparisons with other steels of the same class on the basis of the corrosion resistance :
2.1 Chemical analysis of steel (A = Steel subject of the invention)Cr Ni Mo Cu W N A) 25.5 7.4 3.9 1.7 0.9 0.27 B) 25.5 7.1 3.6 0.7 0.7 0.26 C) 25.4 7.0 3.6 0.2 --- 0.28
2.2 Pitting corrosion resistance (ASTM G48) at 50°C - 24 h.A B C weight loss (g/m²) 0.049 0.070 0.76 N° of pitting/m² 0 0 270 Max pit depth (micron) 0 0 100 Critical Pitting Temp.(°C) 80 60 50
2.3 Corrosion resistance in 5% Na Cl at PH = 4 - 6 at 600 mV :A B C CPT (°C) 80 72 63
2.4 Crevice corrosion resistance (ASTM G78 modified) 100 days . - Environment :
- Aerated sea water containing 20,000 ppm cloride plus 2 ppm residual chlorine with occasional shock dosing up to 10 ppm chlorine ar 35°C
A | B | C | |
N° of crevice (min/max) | Absent | 1 / 3 | Traces |
2.5 Sulfide Stress Cracking Resistance of the steel object of the invention (NACE TM-01-77) at 80°C - 760 h :
Applied load = 550 MPa no cracking
Claims (8)
- Chemical composition (in percent by weight ) :
C 0.025 max Mn 0.80 max Si 0.80 max Cr 24 - 26 Ni 6.5 - 8.0 Mo 3.0 - 4.0 S 0.002 max P 0.025 max Cu 1.2 - 2.0 W 0.8 - 1.2 N 0.23 - 0.33 Fe balance
Balanced chemical composition to obtain after solution heat treatment at 1070-1100°C an alfa Ferrite of 40 - 60%. - Alloy according to claim 1, characterized in that the content of C is 0.01 - 0.02%.
- Alloy according to claim 1, characterized in that the content of Si is 0.35 - 0.60%.
- Alloy according to claim 1, characterized in that the content of Ni is 7.0 - 7.5%.
- Alloy according to claim 1, characterized in that the content of Mo is 3.7 - 4.0%
- Alloy according to claim 1, characterized in that the content of Cu is 1.6- 1.9%.
- Alloy according to claim 1, characterized in that the content of W is 0.9- 1.1%.
- Alloy accorgind to claim 1, characterized in that the content of N is 0.25- 0.30%.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITRM920309 | 1992-04-24 | ||
ITRM920309A IT1257695B (en) | 1992-04-24 | 1992-04-24 | AUSTENO-FERRITIC STEEL WITH HIGH CORROSION RESISTANCE AND HIGH STRENGTH AT THE SOLUBIZED STATE. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0566814A1 true EP0566814A1 (en) | 1993-10-27 |
EP0566814B1 EP0566814B1 (en) | 1997-09-03 |
Family
ID=11400969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92830586A Revoked EP0566814B1 (en) | 1992-04-24 | 1992-10-26 | Superduplex stainless steel having high corrosion resistance and high yield strength in the solution annealed condition |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0566814B1 (en) |
AT (1) | ATE157710T1 (en) |
DE (1) | DE69222027D1 (en) |
IT (1) | IT1257695B (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0594935A1 (en) | 1992-10-27 | 1994-05-04 | DALMINE S.p.A. | Highly mechanical and corrosion resistant stainless steel and relevant treatment process |
EP0649913A1 (en) * | 1993-10-21 | 1995-04-26 | Creusot-Loire Industrie | High strength stainless austenitic steel with high structural stability and its uses |
EP0683241A3 (en) * | 1994-05-21 | 1996-05-08 | Park Yong S | Duplex stainless steel with high corrosion resistance. |
EP0757112A1 (en) * | 1994-04-05 | 1997-02-05 | Sumitomo Metal Industries, Ltd. | Two-phase stainless steel |
EP0692547B1 (en) * | 1994-07-11 | 2001-10-04 | Metso Powdermet Oy | Roll manufacture |
US8710405B2 (en) * | 2005-04-15 | 2014-04-29 | Nippon Steel & Sumikin Stainless Steel Corporation | Austenitic stainless steel welding wire and welding structure |
CN103966522A (en) * | 2013-01-25 | 2014-08-06 | 精工电子有限公司 | Two-phase Stainless Steel, Method Of Manufacturing The Same, And Diaphragm, Pressure Sensor, And Diaphragm Valve Using Two-phase Stainless Steel |
JP2019505677A (en) * | 2015-12-23 | 2019-02-28 | グッドウィン ピーエルシーGoodwin Plc | Steel, welding consumables, cast or forged or stretched products, welding methods, welded products, and heat treatment methods |
CN111197144A (en) * | 2020-02-21 | 2020-05-26 | 青岛三庆金属有限公司 | High-temperature-resistant stainless steel composition for food heating container |
WO2020158111A1 (en) * | 2019-01-30 | 2020-08-06 | Jfeスチール株式会社 | Duplex stainless steel, seamless steel pipe, and production method for duplex stainless steel |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10357653A1 (en) * | 2003-12-10 | 2005-07-07 | Abb Research Ltd. | Ship propulsion system, e.g. for container ships and liquid gas tankers, has a propeller at a motor housing and carrier arm attached to the hull of a non-corroding metal alloy |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160221A (en) * | 1984-06-13 | 1985-12-18 | Nippon Kokan Kk | Two phase stainless steel having improved impact characteristic |
GB2203680A (en) * | 1987-04-21 | 1988-10-26 | Nippon Yakin Kogyo Co Ltd | Direct production of stainless steel strip having excellent superplasticity and surface properties |
US4816085A (en) * | 1987-08-14 | 1989-03-28 | Haynes International, Inc. | Tough weldable duplex stainless steel wire |
EP0360143A1 (en) * | 1988-09-13 | 1990-03-28 | Carondelet Foundry Company | Corrosion resistant alloy |
-
1992
- 1992-04-24 IT ITRM920309A patent/IT1257695B/en active IP Right Grant
- 1992-10-26 EP EP92830586A patent/EP0566814B1/en not_active Revoked
- 1992-10-26 DE DE69222027T patent/DE69222027D1/en not_active Expired - Lifetime
- 1992-10-26 AT AT92830586T patent/ATE157710T1/en not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2160221A (en) * | 1984-06-13 | 1985-12-18 | Nippon Kokan Kk | Two phase stainless steel having improved impact characteristic |
GB2203680A (en) * | 1987-04-21 | 1988-10-26 | Nippon Yakin Kogyo Co Ltd | Direct production of stainless steel strip having excellent superplasticity and surface properties |
US4816085A (en) * | 1987-08-14 | 1989-03-28 | Haynes International, Inc. | Tough weldable duplex stainless steel wire |
EP0360143A1 (en) * | 1988-09-13 | 1990-03-28 | Carondelet Foundry Company | Corrosion resistant alloy |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0594935A1 (en) | 1992-10-27 | 1994-05-04 | DALMINE S.p.A. | Highly mechanical and corrosion resistant stainless steel and relevant treatment process |
US5352406A (en) * | 1992-10-27 | 1994-10-04 | Centro Sviluppo Materiali S.P.A. | Highly mechanical and corrosion resistant stainless steel and relevant treatment process |
US5494636A (en) * | 1993-01-21 | 1996-02-27 | Creusot-Loire Industrie | Austenitic stainless steel having high properties |
EP0649913A1 (en) * | 1993-10-21 | 1995-04-26 | Creusot-Loire Industrie | High strength stainless austenitic steel with high structural stability and its uses |
FR2711674A1 (en) * | 1993-10-21 | 1995-05-05 | Creusot Loire | Austenitic stainless steel with high characteristics having high structural stability and uses. |
US5849111A (en) * | 1994-04-05 | 1998-12-15 | Sumitomo Metal Industries, Ltd. | Duplex stainless steel |
EP0757112A1 (en) * | 1994-04-05 | 1997-02-05 | Sumitomo Metal Industries, Ltd. | Two-phase stainless steel |
EP0757112A4 (en) * | 1994-04-05 | 1997-06-18 | Sumitomo Metal Ind | Two-phase stainless steel |
EP0683241A3 (en) * | 1994-05-21 | 1996-05-08 | Park Yong S | Duplex stainless steel with high corrosion resistance. |
EP0692547B1 (en) * | 1994-07-11 | 2001-10-04 | Metso Powdermet Oy | Roll manufacture |
US8710405B2 (en) * | 2005-04-15 | 2014-04-29 | Nippon Steel & Sumikin Stainless Steel Corporation | Austenitic stainless steel welding wire and welding structure |
CN103966522A (en) * | 2013-01-25 | 2014-08-06 | 精工电子有限公司 | Two-phase Stainless Steel, Method Of Manufacturing The Same, And Diaphragm, Pressure Sensor, And Diaphragm Valve Using Two-phase Stainless Steel |
JP2019505677A (en) * | 2015-12-23 | 2019-02-28 | グッドウィン ピーエルシーGoodwin Plc | Steel, welding consumables, cast or forged or stretched products, welding methods, welded products, and heat treatment methods |
WO2020158111A1 (en) * | 2019-01-30 | 2020-08-06 | Jfeスチール株式会社 | Duplex stainless steel, seamless steel pipe, and production method for duplex stainless steel |
JP6747628B1 (en) * | 2019-01-30 | 2020-08-26 | Jfeスチール株式会社 | Duplex stainless steel, seamless steel pipe, and method for producing duplex stainless steel |
CN111197144A (en) * | 2020-02-21 | 2020-05-26 | 青岛三庆金属有限公司 | High-temperature-resistant stainless steel composition for food heating container |
Also Published As
Publication number | Publication date |
---|---|
DE69222027D1 (en) | 1997-10-09 |
ITRM920309A1 (en) | 1993-10-24 |
ATE157710T1 (en) | 1997-09-15 |
IT1257695B (en) | 1996-02-01 |
ITRM920309A0 (en) | 1992-04-24 |
EP0566814B1 (en) | 1997-09-03 |
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