JIS G 4801 PDF

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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Further, not only excellent characteristics but also price competitiveness are required on automobile parts such as piston rings. Image analysis on an enlarged photomicrograph of this structure revealed that the spheroidal cementite had an average jjis size of 0. 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.

JIS G4801 Sup7 Spring Flat Steel

An object of the present invention is to provide a compression ring having excellent thermal conductivity and thermal sag resistance as well as good price competitiveness, which can be used in a high-thermal-load environment in high-compression-ratio engines, and a method for producing such a compression ring.

Each 44801 of SUP10 steel rolled to 8 mm in diameter was formed into a rectangular cross-sectioned wire of 1. Share on Facebook Share. In Comparative Example 1, a rectangular cross-sectioned wire of 1. If the average particle size exceeds 1.

SteelJIS: Japanese Steels and Alloys

However, it does not have sufficient thermal sag resistance. A usual measure against knocking is the delaying of ignition timing spark advancebut it makes it impossible to keep high thermal efficiency. Steel is generally more inexpensive as the amounts of alloying elements are smaller. Alloy to be surface-coated and sliding members. 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. Thus, among the three basic functions of piston rings, a gas-sealing function, a thermal conduction function and an oil control function, the thermal conduction function is utilized.

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We pride ourselves on our impeccable quality and service. The temperature and time period of the oil-tempering treatment comprising an oil quenching step and a tempering treatment step should be set such that all spheroidal carbides are not dissolved, namely, the spheroidal carbides have a preferred area ratio.

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. 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 due to the high-temperature impingement and sliding of compression rings, making likely the wearing of ring grooves and microwelding to compression rings.

SUP9A steels, Highlight the advantage is good hardenability, another hot working performance, comprehensive mechanical properties.

Compression ring and its production method. Japanese Office Action, dated Feb. The extended European search report, dated Mar. For environmental protection, automobile engines are recently designed to have improved fuel efficiency, low emission and high power, so that engines tend to have high compression ratios and high load.

About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil.

The results are shown in Table 2 and FIG. SUP9A steel Rectangular pieces can be sawn from flat bar or plate to your specific sizes.

The compression ring of the present invention has a composition comprising by mass 0. When the microwelding occurs, the torque of a rotating shaft 2 changes, accompanied by temperature elevation. In this case, the spheroidizing annealing is inevitably a batch treatment.


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Measurement of Thermal Conductivity In Examples 1, 4 and 5, and Comparative Examples 1, 2 and 5, the thermal conductivity was measured by a laser flash method.

The facts that the amount of Si, a solution-strengthening element, is particularly smaller in SUP10 used in the present invention than in Si—Cr steel, and that spheroidal cementite is formed, appear to contribute to the improvement of thermal conductivity by reducing the solid solution of C.

In Examples 1, 4 and 5, and Comparative Examples 1, 2 and 5, the thermal conductivity was measured by a laser flash method. Thus, cost reduction is an important object. Next Patent Gas turbine engine v The jix cementite preferably has an average particle size of 0. Process for the production of hardened parts of steel. About Our Company Otai Special Steel was established in to provide a wide range of high quality steel to the global market.

Process for setting the thermal conductivity of a steel, tool steel, in jjis hot-work steel, and steel object.

This appears to be due to influence by the surface roughness of the manganese phosphate coating. The batch treatment is inserted between continuous treatments in a conventional production line, inevitably resulting in lower productivity.

T stress is concentrated on the spheroidal cementite, it is considered as a factor of decreasing the mechanical properties of steel wires. The number of cycles at that time was used to evaluate the life of the ring. Ground Spring Steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Share on Pinterest Share. The relation between the thermal conductivity of the steel and the total amount of alloying elements is shown in FIG.

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