CN103805876A - Austenitic heat-resistant steel for automobile turbine casings and exhaust pipes - Google Patents
Austenitic heat-resistant steel for automobile turbine casings and exhaust pipes Download PDFInfo
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- CN103805876A CN103805876A CN201210460926.XA CN201210460926A CN103805876A CN 103805876 A CN103805876 A CN 103805876A CN 201210460926 A CN201210460926 A CN 201210460926A CN 103805876 A CN103805876 A CN 103805876A
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Abstract
The invention provides an austenitic heat-resistant steel for automobile turbine casings and exhaust pipes, which comprises the following components in percentage by weight: 0.20-0.50% of carbon, 1.00-2.50% of silicon, 1.0-2.0% of manganese, less than 0.04% of phosphorus, less than 0.030% of sulfur, 20-27% of chromium, 25-28% of nickel, less than 0.6% of molybdenum, 1.0-2.0% of niobium, 0.2-0.5% of nitrogen and the balance of iron. The austenitic heat-resistant steel has the advantages of favorable thermal conductivity, high elastic modulus, excellent creep rupture strength and long creep rupture life; and the preparation method is scientific and reasonable, and is low in cost.
Description
Technical field
The present invention relates to a kind of vehicle turbine shell and vapor pipe austenitic heat-resistance steel.
Background technology
After 2005, the world comes into effect Europe 4 standards, the exhaust temperature of high-grade motor car engine has exceeded 1000 ℃, therefore the steel that vehicle turbine shell and vapor pipe are used develop on the basis of nickel-pour austenitic steel nickelic, chromium austenite high temperature steel (as GX40NiCrSiNb38-19), this steel allow high exhaust temperature can reach 1020 ℃.But the content of its nickel of this steel (Ni) reaches 36% to 39%, cause its production cost significantly to improve, and consider economical not from resources conservation angle.In addition, material as vehicle turbine shell and vapor pipe not only needs have enough oxidation-resistances and hot strength, also in long service process, there is good creep-rupture strength, so just require material itself should there is good heat conductivility and high Young's modulus, thereby under thermal cycling load, produce less thermal stresses and deflection, therefore still need to update the steel that vehicle turbine shell and vapor pipe are used.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that currently available products exists, and provide a kind of vehicle turbine shell and vapor pipe austenitic heat-resistance steel, it has creep-rupture strength and the creep rupture life of thermal conductive resin, high elastic coefficient, excellence, and preparation method is scientific and reasonable, cost is lower.
The object of the invention is to be realized by following technical scheme.
The weight percent of its content of the present invention is: carbon (C) is 0.20 to 0.50%, silicon (Si) is 1.00 to 2.50%, manganese (Mn) is 1.0 to 2.0%, and phosphorus (P) is for being less than 0.04%, and sulphur (S) is for being less than 0.030, chromium (Cr) is 20 to 27%, nickel (Ni) is 25 to 28%, and molybdenum (Mo) is for being less than 0.6%, and niobium (Nb) is 1.0 to 2.0%, nitrogen (N) is 0.2 to 0.5%, and surplus is iron (Fe).
The beneficial effect of austenitic heat-resistance steel for vehicle turbine shell of the present invention and vapor pipe, it has creep-rupture strength and the creep rupture life of thermal conductive resin, high elastic coefficient, excellence, and preparation method is scientific and reasonable, and cost is lower.
Embodiment
Vehicle turbine shell of the present invention and vapor pipe austenitic heat-resistance steel, the weight percent of its content is: carbon (C) is 0.20 to 0.50%, and silicon (Si) is 1.00 to 2.50%, and manganese (Mn) is 1.0 to 2.0%, phosphorus (P) is for being less than 0.04%, sulphur (S) is for being less than 0.030, and chromium (Cr) is 20 to 27%, and nickel (Ni) is 25 to 28%, molybdenum (Mo) is for being less than 0.6%, niobium (Nb) is 1.0 to 2.0%, and nitrogen (N) is 0.2 to 0.5%, and surplus is iron (Fe).
Embodiment:
One, batching: the proportioning of main raw material: steel scrap=5%, extra low carbon ferrochromium=8%, nickel plate=5%, returns material=80% ferro-niobium=%, chromium nitride=0.6%, other iron alloys are appropriate.
Two, melting and modified: melting equipment adopts medium-frequency induction furnace, the capacity of induction furnace is not from 0.5 ton to 3 tons etc.The above-mentioned raw material preparing is dropped in stove in order successively to then feeding temperature-raising; When the material dropping into holds out completely, continue to be warming up to 1580 degree left and right, get spectrum analysis test piece and carry out spectrum analysis; The adjustment amount that calculates the element that exceeds standard according to the result of spectrum analysis, then adds alloy in induction furnace according to adjustment amount, treats that temperature is increased to 1600 degree left and right and carries out spectrum analysis again until each element meets the demands.Analytical results sees the following form:
Three, go out soup and molten soup processing: after chemical composition meets the demands, molten steel continues to be warming up to 1680 degree left and right and goes out soup in stove, go out soup before power-off leave standstill the scum silica frost of taking molten steel surface after 3 to 5 minutes off.Sufficient preheating pouring ladle is positioned to induction furnace tapping mouth of a river place and prepares out molten steel.After going out in molten steel process in bag to drop into alterant (object: deoxidation, degasification, crystal grain thinning), going out soup, remove molten steel surface scum silica frost, wait to be cast.
Four, pour into a mould and devan: thermometric in bag before cast, temperature-measuring results conformance with standard requires (1550 ~ 1650 degree) to pour into a mould.Be poured to the time interval controls of devaning more than 60 minutes.
Five, aftertreatment: foundry goods carries out can putting in storage after the operations such as washed-out sand, grinding, finishing, check after devaning.
Vehicle turbine shell of the present invention and vapor pipe by the advantage of austenitic heat-resistance steel are: the yield-point of 1100 ℃ is more than 50MPa; The thermal conductivity of 1200 ℃ is 27W/(m*K) more than; The Young's modulus of 1200 ℃ is more than 90GPa; When 900 ℃ of 65MPa, creep fracture time is more than 65h.Therefore the vehicle turbine shell and the vapor pipe that use this steel to produce have good heat shock resistance, antioxidant property; There is heat resisting temperature high; Thermal expansivity is little, heat-conduction coefficient is high; The character that Speed of diffusion waits other refractory alloy not possess soon.
According to the present invention, vehicle turbine shell and vapor pipe are prepared burden with the composition range of austenitic heat-resistance steel, and adopt prior art melting, casting, select GX40NiCrSiNb38-19 steel as a comparison, adopt same prior art to carry out melting, casting, the sample that the rear sample of casting is processed into respectively same equal-specification carries out mechanical property and heat physical properties test, result shows that normal temperature yield strength and the tensile strength of vehicle turbine shell of the present invention and vapor pipe austenitic heat-resistance steel improve more than 20% than GX40NiCrSiNb38-19 compared steel, 1100 ℃ of high-temperature yield strengths and tensile strength improve more than 10%, when 900 ℃ of 65MPa, creep duration extends more than 40%, room temperature and 1200 ℃ of high-temperature elastic modulus improve more than 15%, heat-conduction coefficient improves 5% left and right, concrete test result is as shown in table 1 below, in table, sequence number 1 is turbine case of the present invention and vapor pipe austenitic heat-resistance steel, sequence number 2 is GX40NiCrSiNb38-19.
Austenitic heat-resistance steel and compared steel for table 1 embodiment of the present invention vehicle turbine shell and vapor pipe
Test result contrast
Through above-mentioned materials performance comparison, vehicle turbine shell of the present invention and vapor pipe are all obviously better than compared steel GX40NiCrSiNb38-19 with austenitic heat-resistance steel at aspects such as hot strength, creep rupture duration, Young's modulus, thermal conductivitys.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment, all still belong in the scope of technical solution of the present invention.
Claims (1)
1. vehicle turbine shell and a vapor pipe austenitic heat-resistance steel, is characterized in that, the weight percent of its content is: carbon (C) is 0.20 to 0.50%, silicon (Si) is 1.00 to 2.50%, manganese (Mn) is 1.0 to 2.0%, and phosphorus (P) is for being less than 0.04%, and sulphur (S) is for being less than 0.030, chromium (Cr) is 20 to 27%, nickel (Ni) is 25 to 28%, and molybdenum (Mo) is for being less than 0.6%, and niobium (Nb) is 1.0 to 2.0%, nitrogen (N) is 0.2 to 0.5%, and surplus is iron (Fe).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210460926.XA CN103805876A (en) | 2012-11-14 | 2012-11-14 | Austenitic heat-resistant steel for automobile turbine casings and exhaust pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210460926.XA CN103805876A (en) | 2012-11-14 | 2012-11-14 | Austenitic heat-resistant steel for automobile turbine casings and exhaust pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103805876A true CN103805876A (en) | 2014-05-21 |
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| CN201210460926.XA Pending CN103805876A (en) | 2012-11-14 | 2012-11-14 | Austenitic heat-resistant steel for automobile turbine casings and exhaust pipes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673173A (en) * | 2015-12-31 | 2016-06-15 | 芜湖恒耀汽车零部件有限公司 | Exhaust pipe made from novel high-performance materials and manufacturing process of exhaust pipe |
| EP3287540A1 (en) * | 2016-08-26 | 2018-02-28 | Tianjin New Wei San Industrial Co., Ltd. | Cr-mn-n austenitic heat-resistant steel and a method for manufacturing the same |
| CN113862562A (en) * | 2021-09-09 | 2021-12-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | Antioxidant high-creep cast austenitic heat-resistant stainless steel and preparation method thereof |
| CN114411068A (en) * | 2019-11-05 | 2022-04-29 | 天津新伟祥工业有限公司 | Heat-resistant steel for automobile turbine shell and exhaust pipe and preparation method thereof |
Citations (4)
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| JPH1085803A (en) * | 1996-09-11 | 1998-04-07 | Sumitomo Metal Ind Ltd | Manufacture of stainless steel strip having minimized seam crack |
| JP2005320606A (en) * | 2004-05-11 | 2005-11-17 | Daido Steel Co Ltd | Austenitic steel casting and its production method |
| CN1942598A (en) * | 2004-04-19 | 2007-04-04 | 日立金属株式会社 | High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same |
| JP2009144203A (en) * | 2007-12-14 | 2009-07-02 | Sumitomo Metal Ind Ltd | Austenitic high alloy-welded joint and austenitic high alloy welding material |
-
2012
- 2012-11-14 CN CN201210460926.XA patent/CN103805876A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085803A (en) * | 1996-09-11 | 1998-04-07 | Sumitomo Metal Ind Ltd | Manufacture of stainless steel strip having minimized seam crack |
| CN1942598A (en) * | 2004-04-19 | 2007-04-04 | 日立金属株式会社 | High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same |
| JP2005320606A (en) * | 2004-05-11 | 2005-11-17 | Daido Steel Co Ltd | Austenitic steel casting and its production method |
| JP2009144203A (en) * | 2007-12-14 | 2009-07-02 | Sumitomo Metal Ind Ltd | Austenitic high alloy-welded joint and austenitic high alloy welding material |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673173A (en) * | 2015-12-31 | 2016-06-15 | 芜湖恒耀汽车零部件有限公司 | Exhaust pipe made from novel high-performance materials and manufacturing process of exhaust pipe |
| CN105673173B (en) * | 2015-12-31 | 2019-09-03 | 台州三元车辆净化器有限公司 | A kind of exhaust pipe and its processing preparation process of novel high-performance material |
| EP3287540A1 (en) * | 2016-08-26 | 2018-02-28 | Tianjin New Wei San Industrial Co., Ltd. | Cr-mn-n austenitic heat-resistant steel and a method for manufacturing the same |
| EP3287540B1 (en) | 2016-08-26 | 2020-06-24 | Tianjin New Wei San Industrial Co., Ltd. | Cr-mn-n austenitic heat-resistant steel and a method for manufacturing the same |
| CN114411068A (en) * | 2019-11-05 | 2022-04-29 | 天津新伟祥工业有限公司 | Heat-resistant steel for automobile turbine shell and exhaust pipe and preparation method thereof |
| CN113862562A (en) * | 2021-09-09 | 2021-12-31 | 中车戚墅堰机车车辆工艺研究所有限公司 | Antioxidant high-creep cast austenitic heat-resistant stainless steel and preparation method thereof |
| CN113862562B (en) * | 2021-09-09 | 2023-12-05 | 中车戚墅堰机车车辆工艺研究所有限公司 | Antioxidant high-creep cast austenitic heat-resistant stainless steel and preparation method thereof |
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Application publication date: 20140521 |