GB781027A - Improved process for the manufacture of piston rings - Google Patents
Improved process for the manufacture of piston ringsInfo
- Publication number
- GB781027A GB781027A GB17287/55A GB1728755A GB781027A GB 781027 A GB781027 A GB 781027A GB 17287/55 A GB17287/55 A GB 17287/55A GB 1728755 A GB1728755 A GB 1728755A GB 781027 A GB781027 A GB 781027A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- quenching
- heating
- manufacture
- temperature
- 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
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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A process for the manufacture of piston rings comprises (a) stack casting the rings in a sand mould from a cast iron having the following constituents, 3-4 per cent C; 1.5-3.1 per cent Si; 0.6-1.5 per cent Mn; 0.8-2.0 per cent Cu; 0.05-0.7 per cent P; 0.02.-0.15 per cent S; 0 to 0.05 per cent Tc. (b) heating to produce austenite and quenching to form martensite; (c) heating to 420-550 DEG C. to produce graphite nucleation; (d) heating for graphitizing at a temperature above the end of the entectoid transformation and cooling in still air; (e) tempering to adjust the final hardness. The austenization may be at 760 to 920 DEG C. followed by quenching in oil, or the quenching may be carried out in two steps, the first to a temperature just above the start of the martensite transformation and the second to a temperature at which the martensite transformation is complete. The rings may be machined and then heated for 5-7 mins. at 5803C. while the ends are held apart. Specifications 738,094 and 742,400 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR781027X | 1954-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB781027A true GB781027A (en) | 1957-08-14 |
Family
ID=9206796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB17287/55A Expired GB781027A (en) | 1954-08-04 | 1955-06-15 | Improved process for the manufacture of piston rings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB781027A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108350557A (en) * | 2015-10-29 | 2018-07-31 | 圣保罗国家技术研究院 | The piston ring and its manufacturing process of casting tool steel |
-
1955
- 1955-06-15 GB GB17287/55A patent/GB781027A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108350557A (en) * | 2015-10-29 | 2018-07-31 | 圣保罗国家技术研究院 | The piston ring and its manufacturing process of casting tool steel |
| CN108350557B (en) * | 2015-10-29 | 2020-05-12 | 圣保罗国家技术研究院 | Piston ring of casting tool steel and manufacturing process thereof |
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