JIS G is standard which specified the spring steel mainly used for the hot formed springs such as the laminated springs, coiled springs. The symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD. See the chemical composition and physical properties of JIS G Grade SUP9A, find alternative materials, and connect with suppliers.
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About 30 min 401 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil. Because the residual cementite of about 0. The results are shown in Table 2 and FIG. Gear part and method of producing thereof. In addition, when pistons are made of aluminum, aluminum softens as the combustion chamber temperature is elevated, so that fatigue failure occurs in ring grooves of pistons jid to the high-temperature impingement and sliding of compression rings, making likely the wearing of ring grooves and microwelding to compression rings.
When the microwelding occurs, the torque of a rotating shaft 2 changes, accompanied by temperature elevation. The test was conducted 5 times in each of Examples 1, 4 and 5, and Comparative Examples 1, 2 and 5, and the measured results were averaged.
The compression ring of the present invention has a composition comprising by mass 0.
What is claimed is: All peripheral surfaces in Comparative Examples were coated with CrN, side surfaces in Comparative Example 3 were coated with zinc phosphate, and side surfaces in Comparative Example 4 were coated with manganese phosphate. Of course, a nis treatment is also usable.
A compression ring ijs of a composition consisting of by mass 0. Wear resistant sintered member. Thus, for the same compression rings, proper surface treatments may be selected depending on sliding mate members, use environment, etc.
SteelJIS: Japanese Steels and Alloys
Materials with smaller amounts of alloying elements have higher thermal conductivities. Namely, a peripheral surface of the mis ring was provided with a CrN coating by ion plating, and side surfaces of the compression ring were provided with a zinc phosphate coating Example 2 and a manganese phosphate coating Example 3.
The Formation of Martensite. SUP9A Spring main jus for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring. Because spheroidal cementite having a predetermined particle size, which is formed by the spheroidizing annealing, is influenced by subsequent heat treatments and affects subsequent drawing, the spheroidizing annealing is preferably conducted immediately before the last oil-tempering treatment.
To meet the above demand, for example, JP A proposes a proper composition comprising C, Si, Mn and Cr, which is defined by parameters in predetermined ranges, for piston rings having excellent thermal conductivity and thermal sag resistance, which are usable as compression rings.
The spheroidal cementite preferably has an average particle size of 0. In a scanning electron photomicrograph of FIG. Image analysis on an enlarged photomicrograph of this structure revealed that the spheroidal cementite had an average particle size of 0.
JIS G – Spring steels (Foreign Standard)
The number of cycles at that time was jia to evaluate the life of the ring. A SumoBrain Solutions Company. Share on Google Plus Share. Though the spheroidizing annealing may be conducted in place of the first patenting treatment for higher productivity, attention should be paid to provide the spheroidal cementite with particle sizes in a predetermined range.
Square Round sheet Plate.
However, it does not have sufficient thermal sag resistance. In Example 3 with a manganese phosphate coating, the difference of a substrate did not change the microwelding resistance life.
In this case, the spheroidizing annealing is inevitably a batch treatment. However, the thermal sag resistance is actually deteriorated as the amounts of alloying elements decrease, making impossible use for compression rings in a high-thermal-load environment. Because the thermal conductivity is mainly determined by the movement of free electrons in crystal grains of metals, higher thermal conductivity is obtained with fewer solid solution elements.
The compression ring of the present invention is obtained from the above wire kis to have a predetermined cross section shape, usually by forming the wire to a free form ring by a cam machine, conducting a strain-removing heat treatment, and grinding the side surfaces, 401 surface, gap, etc.
Accordingly, the spheroidizing annealing is conducted preferably in place of the second patenting treatment. A higher thermal conductivity provided a higher thermal sag ratio in Comparative Examples 1, 2 and 5, but the thermal sag ratios of Examples 1 and 5 were lower than a line connecting three Comparative Examples, confirming that the thermal sag ratio decreased at the same thermal conductivity, namely improvement in the thermal sag resistance.
JIS G4801 Spring Steel Flat Bars SUP9,Spring Steel Sup7 Sup9
Accordingly, knocking can be suppressed without needing such control as to delay ignition timing, keeping high thermal efficiency. Of course, surface treatments such as plating, PVD, etc. To lower the temperature of combustion chamber walls, it is effective to lower the temperature of piston crown surfaces.
Alloy to be surface-coated and sliding members. To provide a price-competitive compression ring having excellent thermal conductivity and thermal sag resistance, which can be used in a high-thermal-load environment of high-compression-ratio engines, steel identified by the material number of SUP10 in JIS Gwhich contains small amounts of alloying elements, is used, and a piston ring wire is annealed before an oil-tempering treatment such that spheroidal cementite having an average particle size of 0.
In Comparative Example 1, a rectangular cross-sectioned wire of 1. Process for setting the thermal conductivity of a steel, tool steel, in particular hot-work steel, and jia object.
Click for automatic bibliography generation. The results are shown in Table 2. Because the heat treatment temperature and time differ depending on the size of a heat treatment furnace and the cross section areas of items to be treated, they should be adjusted such that the spheroidal cementite has preferred particle size and area ratio.
Thus, the compression ring of the present invention has a composition comprising by mass 0.
JIS G – Spring steels (Foreign Standard)
8401 Further, not only excellent characteristics but also price competitiveness are required on automobile parts such as piston rings. Because the compression ring of the present invention has both high thermal conductivity and high thermal sag resistance, even when used in a high-thermal-load environment such as high-compression-ratio engines, the ring can efficiently dissipate heat from a piston head to a cooled cylinder wall without losing a spring force.
Despite many huge merger 480 in the industry, we remain a friendly, family business. The present invention relates to a piston ring for automobile engines, particularly to a compression ring used in a high-thermal-load environment in high-compression-ratio engines, and its production method.
Compression ring and its production method. In Examples 1, 4 and 5, and Comparative Examples 1, 2 and 5, the thermal jid was measured by a laser flash ijs. The above composition is basically a steel composition identified by the material number of SUP10 according to JIS Ghaving high thermal conductivity because of a small total amount of alloying elements, though it comprises small amounts of Cr and V.