CA2220255C - Steel material with high thermal resistance for producing engine piston upper parts - Google Patents
Steel material with high thermal resistance for producing engine piston upper parts Download PDFInfo
- Publication number
- CA2220255C CA2220255C CA002220255A CA2220255A CA2220255C CA 2220255 C CA2220255 C CA 2220255C CA 002220255 A CA002220255 A CA 002220255A CA 2220255 A CA2220255 A CA 2220255A CA 2220255 C CA2220255 C CA 2220255C
- Authority
- CA
- Canada
- Prior art keywords
- steel
- steel material
- upper parts
- piston upper
- high thermal
- 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 - Fee Related
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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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)
- Pistons, Piston Rings, And Cylinders (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
A steel material is useful for producing the upper part of engine pistons with high wear, corrosion and heat resistance. This steel has the following composition (in % by weight): 1.20 to 1.50 Mn; 0.50 to 0.80 Si;
0.35 to 0.40 C; 0.10 to 0.50 Mn; 0.08 to 0.13 V; 0.010 to 0.065 S; 0.015 to 0.050 Al; <= 0.035 P, the remainder being iron and production impurities.
0.35 to 0.40 C; 0.10 to 0.50 Mn; 0.08 to 0.13 V; 0.010 to 0.065 S; 0.015 to 0.050 Al; <= 0.035 P, the remainder being iron and production impurities.
Description
4 NOU '97 15:53 UON HOFFMRNN-EITLE R RN 0015149541396 SEITE 0151023 Steel Material With High Thermal Resistance For Producing Engine PistowUpper Parts Description The invention relates to a steel material for producing engine piston upper parts.
In diesel motors, extx'emely high compressions with good fuel utilization, low emissions and high km life expectancy can be obtained with steel forged piston upper parts. In this connection, the piston upper parts are generally quenched and tempered from.the material 42CrMo4 in a range from a00 to 1200 N/mm2, i.e. hardened by heating from room temperature to 860°C and subsequently quenching in heavy-duty oil and tempered by renewed heating to ca. 480 to 660°C with fiilal cooling in a container_ The temperatures in the hardening and/or tempering furnace are adjusted according to the respective steel analysis and the customer instructions with respect to strength.
The wear, corrosion and thezmal resistance properties of the piston upper parts which are required by the consumer can only be obtained with the above mentioned steel and the forging method. However, the construction principle of the pendulum shaft piston with a steel forged upper part and aluminum skirt has the disadvantage that the motor is expensive in comparison to the one-piece pistons produced from aluminum which is also caused by the quenching and tempering (heat treatment) of the steel piston upper part.
The object of the present invention is to provide a material with which steel forged piston upper parts can be produced without quenching and tempering, and hence more economically, without negatively influencing the wear, corrosion and heat resistaTice properties.
4 NOU '97 15:54 UON HOFFMRNN-EITLE R RN 0015149541396 SEITE 0161023 This problem is solved according to the invention by a steel material which has the following composition (: by weight):
Mn: 1.20 to 1.50 Si: 0.50 t0 0.80 C: 0.35 to 0.40 Mo: 0.10 to O.SO
v: 0.0$ to 0.13 S: 0.010 to 0.065 Al: 0.015 to 0_050 P: S 0.035 the remainder being iron and production impurities.
In this connection, the production impurities can especially include the elements Ni and Cr which can each generally be present in the steel material in an amount of _< 0.20 % by weight.
In this connection, the steels according to the invention can be produced in a customary manger in an electric oven, whereby scrap is employed as a starting material. This scrap is melted down in the electric oven and the melt is subsequently refined for reduction of the phosphorous contest. The steel is run off in a ladle for secondary metallurgical treatment. This means that loading agents such as FeSi, FeCr, MnCr or FeMo are added as a function of the analysis of the steel obtained from the electric oven in order to adjust the ranges of the individual elements in the steel according to the invention. In this connection, aluminu~tc is also added for steadying. The homflgenization of the melt and its adjustment to the respectively desired temperature then occurs in a pan furnace. Subsequently, the fine adjustment of the weight amounts of the individual elements in the claimed steel occurs through the addition of the loading agents already mentioned above. Gases such as 4 NOU '97 15:54 VON HOFFMRNN-EITLE R RN 0015149541396 SEITE 0171023 hydrogen dissolved in the melt are then removed by de-gassing. If necessary, corrections are carried out here with respect to the contest of aluminum which is normally spooled in in wire form. Following the vacuum treatment, the melt is then cast into a billet or block.
Piston upper parts which mast no longer be quenched and tempered can be steel forged with the steel according to the invention in order to obtain the desired high thermal resistance properties. The piston upper parts are cooled in a controlled manner from the forming heat (BY-treatment BEST YIBLD).
8xampie According to the process presented above, a steel material according to the invention was produced which has the following composition:
Mn: I.31 Si: 0.57 C. 0.38 Mo: 0.43 v: o.ix S: 0.046 Al: 0.024 P: 0.011 Cr: O.I7 Ni: 0.03 reroaiader is iron.
The steel of the above composition was compared with respect to its mechanical properties with the steel 42CrMo4 (standard analysis according to the norm 13~T 10083). The results are presented is the following table:
In diesel motors, extx'emely high compressions with good fuel utilization, low emissions and high km life expectancy can be obtained with steel forged piston upper parts. In this connection, the piston upper parts are generally quenched and tempered from.the material 42CrMo4 in a range from a00 to 1200 N/mm2, i.e. hardened by heating from room temperature to 860°C and subsequently quenching in heavy-duty oil and tempered by renewed heating to ca. 480 to 660°C with fiilal cooling in a container_ The temperatures in the hardening and/or tempering furnace are adjusted according to the respective steel analysis and the customer instructions with respect to strength.
The wear, corrosion and thezmal resistance properties of the piston upper parts which are required by the consumer can only be obtained with the above mentioned steel and the forging method. However, the construction principle of the pendulum shaft piston with a steel forged upper part and aluminum skirt has the disadvantage that the motor is expensive in comparison to the one-piece pistons produced from aluminum which is also caused by the quenching and tempering (heat treatment) of the steel piston upper part.
The object of the present invention is to provide a material with which steel forged piston upper parts can be produced without quenching and tempering, and hence more economically, without negatively influencing the wear, corrosion and heat resistaTice properties.
4 NOU '97 15:54 UON HOFFMRNN-EITLE R RN 0015149541396 SEITE 0161023 This problem is solved according to the invention by a steel material which has the following composition (: by weight):
Mn: 1.20 to 1.50 Si: 0.50 t0 0.80 C: 0.35 to 0.40 Mo: 0.10 to O.SO
v: 0.0$ to 0.13 S: 0.010 to 0.065 Al: 0.015 to 0_050 P: S 0.035 the remainder being iron and production impurities.
In this connection, the production impurities can especially include the elements Ni and Cr which can each generally be present in the steel material in an amount of _< 0.20 % by weight.
In this connection, the steels according to the invention can be produced in a customary manger in an electric oven, whereby scrap is employed as a starting material. This scrap is melted down in the electric oven and the melt is subsequently refined for reduction of the phosphorous contest. The steel is run off in a ladle for secondary metallurgical treatment. This means that loading agents such as FeSi, FeCr, MnCr or FeMo are added as a function of the analysis of the steel obtained from the electric oven in order to adjust the ranges of the individual elements in the steel according to the invention. In this connection, aluminu~tc is also added for steadying. The homflgenization of the melt and its adjustment to the respectively desired temperature then occurs in a pan furnace. Subsequently, the fine adjustment of the weight amounts of the individual elements in the claimed steel occurs through the addition of the loading agents already mentioned above. Gases such as 4 NOU '97 15:54 VON HOFFMRNN-EITLE R RN 0015149541396 SEITE 0171023 hydrogen dissolved in the melt are then removed by de-gassing. If necessary, corrections are carried out here with respect to the contest of aluminum which is normally spooled in in wire form. Following the vacuum treatment, the melt is then cast into a billet or block.
Piston upper parts which mast no longer be quenched and tempered can be steel forged with the steel according to the invention in order to obtain the desired high thermal resistance properties. The piston upper parts are cooled in a controlled manner from the forming heat (BY-treatment BEST YIBLD).
8xampie According to the process presented above, a steel material according to the invention was produced which has the following composition:
Mn: I.31 Si: 0.57 C. 0.38 Mo: 0.43 v: o.ix S: 0.046 Al: 0.024 P: 0.011 Cr: O.I7 Ni: 0.03 reroaiader is iron.
The steel of the above composition was compared with respect to its mechanical properties with the steel 42CrMo4 (standard analysis according to the norm 13~T 10083). The results are presented is the following table:
4 NOU '97 15:54 UON HOFFMRNN-EITLE R AN 0015149541396 SEITE 0181023 Table:
Comparison of hot-drawn samples 42CrMo4 r~~e _~P_~~~_L~ ono"C
tensile strength ' 930 630 Rm (N/mm2) yield stxength 480 Rp 0 . 2 (N/mm2) constriction Z (%) ~5 strain AS (%) 25 steel according to example room temperature ~C
tensile strength 1020 810 Rm ( N/mmZ ) yield strength 605 Rp 0 . 2 ( N /m~ttZ ) constriction Z (%) 58 strain A5 (%) 14.5 The values o~ the abvve~tabledemonstrate the advantageous mechanical propert~.es of steel according to the the invention.
Comparison of hot-drawn samples 42CrMo4 r~~e _~P_~~~_L~ ono"C
tensile strength ' 930 630 Rm (N/mm2) yield stxength 480 Rp 0 . 2 (N/mm2) constriction Z (%) ~5 strain AS (%) 25 steel according to example room temperature ~C
tensile strength 1020 810 Rm ( N/mmZ ) yield strength 605 Rp 0 . 2 ( N /m~ttZ ) constriction Z (%) 58 strain A5 (%) 14.5 The values o~ the abvve~tabledemonstrate the advantageous mechanical propert~.es of steel according to the the invention.
Claims (2)
1. Steel material with the following composition (% by weight):
Mn: 1.20 to 1.50 Si: 0.50 to 0.80 C: 0.35 to 0.40 Mo: 0.10 to 0.50 V: 0.08 t0 0.13 S: 0.010 to 0.065 Al: 0.015 to 0.050 P: <= 0.035 the remainder being iron and production impurities.
Mn: 1.20 to 1.50 Si: 0.50 to 0.80 C: 0.35 to 0.40 Mo: 0.10 to 0.50 V: 0.08 t0 0.13 S: 0.010 to 0.065 Al: 0.015 to 0.050 P: <= 0.035 the remainder being iron and production impurities.
2. Use of a steel material according to claim 1 for producing motor piston upper parts.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96905866A EP0824602B1 (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
| PCT/EP1996/000954 WO1997033010A1 (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
| CA002220255A CA2220255C (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP1996/000954 WO1997033010A1 (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
| CA002220255A CA2220255C (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2220255A1 CA2220255A1 (en) | 1997-09-12 |
| CA2220255C true CA2220255C (en) | 2005-05-10 |
Family
ID=25679799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002220255A Expired - Fee Related CA2220255C (en) | 1996-03-06 | 1996-03-06 | Steel material with high thermal resistance for producing engine piston upper parts |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0824602B1 (en) |
| CA (1) | CA2220255C (en) |
| WO (1) | WO1997033010A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2229140A (en) * | 1939-12-20 | 1941-01-21 | Republic Steel Corp | Abnormal steel |
| DE3201204C2 (en) * | 1982-01-16 | 1983-12-22 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8900 Augsburg | "Use of a carbon-manganese steel for components with high strength and toughness with simple heat treatment" |
| GB9116412D0 (en) * | 1990-08-03 | 1991-09-11 | Samsung Heavy Ind | High toughness non-refined steels and method for manufacturing them |
| GB2287956B (en) * | 1994-03-31 | 1998-02-04 | Daewoo Heavy Ind Co Ltd | Thermal refiningless hot-rolled steel and method of making same |
-
1996
- 1996-03-06 EP EP96905866A patent/EP0824602B1/en not_active Expired - Lifetime
- 1996-03-06 WO PCT/EP1996/000954 patent/WO1997033010A1/en active IP Right Grant
- 1996-03-06 CA CA002220255A patent/CA2220255C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0824602A1 (en) | 1998-02-25 |
| CA2220255A1 (en) | 1997-09-12 |
| EP0824602B1 (en) | 2001-09-19 |
| WO1997033010A1 (en) | 1997-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |