EP1546416A1 - Cast exhaust system - Google Patents
Cast exhaust systemInfo
- Publication number
- EP1546416A1 EP1546416A1 EP03747746A EP03747746A EP1546416A1 EP 1546416 A1 EP1546416 A1 EP 1546416A1 EP 03747746 A EP03747746 A EP 03747746A EP 03747746 A EP03747746 A EP 03747746A EP 1546416 A1 EP1546416 A1 EP 1546416A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- max
- alloy
- graphite
- carbon
- nitrogen
- 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
Links
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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D1/02—Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/02—Hardening by precipitation
Definitions
- the present invention is related to alloys for cast parts, in particular to graphite and nitrogen-free alloys destined to be structural and /or pressure containing components for high temperature or low temperature, oxidation and/or corrosion resistant service such as exhaust systems for gas turbine, gasoline and diesel internal combustion engines, pumps, valves, fittings, compressors, or other components. Furthermore, a production process of said alloys is disclosed.
- Ni-Resist alloys are highly alloyed austenitic graphitic irons. Carbon levels of the Ni- Resist alloys are typically in the range of 2.0 to 3.0 weight percent, and flake or spheroidal graphite is intentionally present in the microstructure.
- the carbon levels have been reduced to produce steel rather than cast iron.
- the disclosed alloy is readily weldable, this benefits immediately to downstream manufacturing operations .
- the present invention aims to provide a substantially graphite and nitrogen-free cast alloy with improved mechanical properties and without diminishment of other desired properties, in particular, corrosion resistance, high temperature strength, oxidation resistance, and non-magnetic characteristics, in comparison with alloys of the prior art.
- Another aim of the present invention is an easy weldable alloy with a maximum reduction of the coefficient of thermal expansion (CTE) while maintaining a good casting quality
- the present invention discloses an air melted, substantially graphite and nitrogen-free alloy, aged or not aged by precipitation hardening, specially adapted for gas turbine or internal combustion engine exhaust system parts, comprising a graphite-free microstructure of the following composition:
- composition further comprising:
- Molybdenum in the range of 0,1 to 4 wt . % discloses a composition further comprising maximum 1 wt.% of copper.
- the present invention discloses a composition further comprising Copper in a range of 0.5 to 8 wt . % and wherein the nickel concentration is in a range of 13 to 22 wt.%
- composition further comprises
- composition further comprises
- a process for the manufacturing of the composition wherein said alloy is strengthened by precipitation hardening of Mo 2 C.
- the process for the manufacturing of the composition of the present invention is disclosed wherein said alloy is not strengthened by ageing and precipitation hardening.
- the desired graphite-free microstructure is produced by restricting the carbon content of the alloy to very low levels, so that they are essentially carbon-free versions of the alloy. In other applications solid solution strengthening of the alloys by interstitial carbon is desirable. Carbon contents up to the solubility limit for each specific composition are foreseen.
- the graphite-free alloys of the present invention are classified as high alloy steels rather than cast irons.
- the advantages of ASTM A439-83 and ASTM A436-84 alloys in comparison to conventional cast irons are corrosion resistance, high temperature strength, oxidation resistance, and non-magnetic properties for some grades . None of these attributes should be affected by the elimination of graphite from the microstructure.
- the matrix of the conventional Ni- Resist alloy is targeted as closely as possible to insure that these attributes are preserved.
- a modified D5B alloy containing 1 wt.% Mo was selected for the initial experiments. A carbon-free version of this initial composition was produced. This alloy was designated DX35BM for experimental identification. Modified D5B composition (D5Bw/Mo) Carbon 2.4 wt . %
- DX35BM offers comparable mechanical and physical properties to D5B w/Mo, while eliminating any potential problems with graphite morphology control .
- the conventional D5B (w/Mo) alloy which can be replaced by the alloy of the present invention is not considered as a weldable alloy.
- One of the goals of the present invention was to produce an alloy that was easily weldable.
- a weldable alloy facilitates the repair of defects uncovered during the manufacturing process, lowers scrap rates and manufacturing costs .
- a further improvement disclosed in the present invention is a nitrogen-restricted version of the above disclosed DX35BM alloy.
- the motivation of such a low nitrogen DX35BM alloy is to assure internal soundness and the avoiding of surface pinholing defects.
- the alloy of the present invention can be produced with raw materials of low nitrogen content.
- Other ways to achieve low nitrogen levels are melting practices that avoid nitrogen pick up from the atmosphere and refining processes that remove nitrogen from the melt.
- Non-limitative examples of such practices and processes are inert gas protection, the timing of bulk chromium additions, Argon Oxygen Decarburization (AOD) refining, and furnace and ladle refining using special composition nitrogen removing slag. These practices and processes may be applied both jointly and separately.
- the alloy of this embodiment of the present invention typically deals with nitrogen levels between 0.002 wt% and 0.01 wt%. In the solidified alloy, the nitrogen level should not exceed 0.02 wt%. Nitrogen levels in excess of 0.02 wt% in said alloys lead to greater amounts of upgrade and weld repair, which are not desired by the customer.
- nitride formers are Ti, V or Zr. Nevertheless, these elements influence the CTE of the alloy and should be limited to a maximum amount of 1%, and preferably 0.5%.
- the inventor developed and refined gas metal arc welding (GMAW) and gas tungsten arc welding (GTA ) procedures for DX35BM using commercially available weld wires containing an approximately the same level of nickel.
- GMAW gas metal arc welding
- GTA gas tungsten arc welding
- the aim of the present invention is a substantially graphite and nitrogen free alloy with improved room temperature mechanical properties that can be substituted directly for similar austenitic ductile and grey cast irons.
- a second aim of the present invention is modified versions of DX35BM with higher strengths at 540-700°C (1000°F-1300°F) . Higher strengths at these temperatures would allow the operating temperature of the engine to be increased, and improves the efficiency.
- the strengthening mechanism to improve the high temperature strength of a modified DX35BM alloy is precipitation hardening (PH) . Distinctly different precipitation hardening mechanisms have been investigated, in distinctly different modifications of the alloy.
- a first embodiment of the present invention is a graphite and nitrogen free version of DX35BM that is a demonstrated replacement for ASTM A439 D5-B w/Mo.
- a second embodiment of the present invention is a graphite free, precipitation hardened version of DX35BM strengthened by the controlled precipitation of Mo 2 C carbide.
- a review of sections of the Fe-C-Mo ternary phase diagram at 2 wt . % and 4 wt . % Mo indicates that Mo 2 C carbide is the equilibrium carbide at approximately 0.25 wt.% C, up to nearly 750°C (1400°F) . This provides a basis for the investigation of the Mo 2 C precipitation reaction in DX35BM and its use as a stable second phase for precipitation hardening in the desired service temperature range of 650- 700°C (1200°-1300°F) .
- the desired chemical composition is coupled with appropriate heat treatment cycles to achieve the desired precipitation hardening effect.
- the heat treatment cycle originally applied to the DX35BM alloy is a stabilisation heat treatment for elevated temperature service similar to that used for D5B+Mo.
- the unmodified alloy in the solution annealed condition responds to ageing treatments, even if not as optimally as a higher alloyed modification of the composition.
- the solution annealing + ageing heat treatment produces enough precipitation hardening to improve mechanical properties, especially in the 540-700°C (1000° - 1300°F) range .
- carbide forming elements can be added in the alloy to perform with the precipitation hardening reinforcement like tungsten, vanadium, zirconium, and niobium in percentages up to 4 wt.% each.
- a further embodiment of the present invention is a higher Mo graphite-free precipitation hardened DX35BM alloy strengthened by the controlled precipitation of Mo 2 C.
- An additional embodiment of the present invention is a graphite-free version of DX35BM containing Nb and additions of titanium and aluminium.
- This alloy is strengthened by the precipitation of various phases including: gamma prime, ⁇ ' (Ni 3 [Al, Ti] ) , gamma double prime, ⁇ " (Ni 3 [Nb,Al,Ti] ) , and delta, ⁇ (Ni 3 Nb) , with Nb rich ⁇ " and ⁇ being the intended secondary phases for strengthening.
- the proposed alloy contains 0.02 wt.% maximum carbon and about 4 wt.% Nb. The very low carbon content is required to minimise the formation of Nb carbides.
- the DX35BM silicon content is lowered to less than 1.0 wt.% to minimise the formation of Nb suicides.
- a further embodiment of the present invention is a graphite-free copper bearing alloy as a substitute of Ni-Resist Type 1 and Type lb which are grey iron alloys of the prior art containing 13.5 to 17.5 wt.% nickel and 5.5 to 7.5 wt.% copper. These alloys are typically adapted to producing pump and valve components .
- Ni-Resist Type 1 is a graphite-free copper bearing alloy as a substitute of Ni-Resist Type 1 and Type lb which are grey iron alloys of the prior art containing 13.5 to 17.5 wt.% nickel and 5.5 to 7.5 wt.% copper. These alloys are typically adapted to producing pump and valve components .
- Ni-Resist Type 1 are grey iron alloys of the prior art containing 13.5 to 17.5 wt.% nickel and 5.5 to 7.5 wt.% copper. These alloys are typically adapted to producing pump and valve components .
- An additional embodiment of the present invention is a graphite-free copper bearing alloy as a substitute of Ni-Resist Type 6 which is a grey iron alloy of the prior art containing 18 to 22 wt.% nickel and 3.5 to 5.5 wt.% copper. This alloy is typically adapted to producing pump and valve components .
- Ni-Resist Type 6 is a grey iron alloy of the prior art containing 18 to 22 wt.% nickel and 3.5 to 5.5 wt.% copper. This alloy is typically adapted to producing pump and valve components .
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Exhaust Silencers (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Catalysts (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US41466202P | 2002-10-01 | 2002-10-01 | |
US414662P | 2002-10-01 | ||
PCT/BE2003/000154 WO2004031419A1 (en) | 2002-10-01 | 2003-09-18 | Graphite and nitrogen-free cast alloys |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1546416A1 true EP1546416A1 (en) | 2005-06-29 |
EP1546416B1 EP1546416B1 (en) | 2006-03-15 |
Family
ID=32069753
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03747746A Expired - Lifetime EP1546416B1 (en) | 2002-10-01 | 2003-09-18 | Cast exhaust system |
Country Status (10)
Country | Link |
---|---|
US (1) | US20040060622A1 (en) |
EP (1) | EP1546416B1 (en) |
JP (1) | JP2006501365A (en) |
KR (1) | KR20050054988A (en) |
AT (1) | ATE320511T1 (en) |
AU (1) | AU2003266865A1 (en) |
BR (1) | BR0313376A (en) |
DE (1) | DE60304052T2 (en) |
ES (1) | ES2259143T3 (en) |
WO (1) | WO2004031419A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7754305B2 (en) * | 2007-01-04 | 2010-07-13 | Ut-Battelle, Llc | High Mn austenitic stainless steel |
US7754144B2 (en) * | 2007-01-04 | 2010-07-13 | Ut-Battelle, Llc | High Nb, Ta, and Al creep- and oxidation-resistant austenitic stainless steel |
CN109717992B (en) * | 2014-11-28 | 2021-07-16 | 元心科技(深圳)有限公司 | Lumen stent prefabricated part and lumen stent prepared by same |
US11479836B2 (en) | 2021-01-29 | 2022-10-25 | Ut-Battelle, Llc | Low-cost, high-strength, cast creep-resistant alumina-forming alloys for heat-exchangers, supercritical CO2 systems and industrial applications |
US11866809B2 (en) | 2021-01-29 | 2024-01-09 | Ut-Battelle, Llc | Creep and corrosion-resistant cast alumina-forming alloys for high temperature service in industrial and petrochemical applications |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3294527A (en) * | 1964-06-09 | 1966-12-27 | Int Nickel Co | Age hardening silicon-containing maraging steel |
US3318690A (en) * | 1964-06-09 | 1967-05-09 | Int Nickel Co | Age hardening manganese-containing maraging steel |
GB2027814B (en) * | 1978-08-14 | 1983-05-05 | Theckston A | Method amd apparatus for abtaining work form heat engery utilising the expansion of metal |
JPS55100959A (en) * | 1979-01-26 | 1980-08-01 | Nisshin Steel Co Ltd | Invar alloy with excellent welding high temperature crack resistance and strain corrosion crack resistance |
US4572738A (en) * | 1981-09-24 | 1986-02-25 | The United States Of America As Represented By The United States Department Of Energy | Maraging superalloys and heat treatment processes |
US4585707A (en) * | 1983-04-29 | 1986-04-29 | Carpenter Technology Corporation | High expansion alloy for bimetal strip |
DE4010474A1 (en) * | 1990-03-31 | 1991-10-02 | Kolbenschmidt Ag | LIGHT METAL PISTON |
JPH046247A (en) * | 1990-04-23 | 1992-01-10 | Nippon Steel Corp | Steel for waste incineration furnace boiler |
JP3332400B2 (en) * | 1991-11-15 | 2002-10-07 | 日新製鋼株式会社 | High expansion alloy for bimetal |
JP3150831B2 (en) * | 1993-09-30 | 2001-03-26 | 日本冶金工業株式会社 | High Young's modulus low thermal expansion Fe-Ni alloy |
JPH10121172A (en) * | 1996-10-21 | 1998-05-12 | Kubota Corp | Heat resisting alloy steel for hearth metal of steel heating furnace |
JP3381845B2 (en) * | 1999-07-08 | 2003-03-04 | 日立金属株式会社 | Low thermal expansion cast steel with excellent machinability |
KR100334253B1 (en) * | 1999-11-22 | 2002-05-02 | 장인순 | Alloy steel having corrosion resistance in molten salt |
-
2003
- 2003-09-18 WO PCT/BE2003/000154 patent/WO2004031419A1/en active IP Right Grant
- 2003-09-18 AU AU2003266865A patent/AU2003266865A1/en not_active Abandoned
- 2003-09-18 EP EP03747746A patent/EP1546416B1/en not_active Expired - Lifetime
- 2003-09-18 DE DE60304052T patent/DE60304052T2/en not_active Expired - Lifetime
- 2003-09-18 ES ES03747746T patent/ES2259143T3/en not_active Expired - Lifetime
- 2003-09-18 BR BR0313376-1A patent/BR0313376A/en not_active Application Discontinuation
- 2003-09-18 JP JP2004540389A patent/JP2006501365A/en active Pending
- 2003-09-18 KR KR1020057005670A patent/KR20050054988A/en not_active Application Discontinuation
- 2003-09-18 AT AT03747746T patent/ATE320511T1/en not_active IP Right Cessation
- 2003-10-01 US US10/674,427 patent/US20040060622A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2004031419A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1546416B1 (en) | 2006-03-15 |
US20040060622A1 (en) | 2004-04-01 |
ES2259143T3 (en) | 2006-09-16 |
KR20050054988A (en) | 2005-06-10 |
BR0313376A (en) | 2005-06-21 |
DE60304052T2 (en) | 2006-11-02 |
AU2003266865A1 (en) | 2004-04-23 |
DE60304052D1 (en) | 2006-05-11 |
JP2006501365A (en) | 2006-01-12 |
WO2004031419A1 (en) | 2004-04-15 |
ATE320511T1 (en) | 2006-04-15 |
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