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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Also, the temperature of ring grooves of an aluminum piston can be lowered, suppressing microwelding and wearing of the ring 481. Despite many huge merger deals in the industry, we remain a friendly, family business.

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.

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. 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.


From the aspect of wear resistance and microwelding resistance, sliding peripheral surfaces of compression steel rings are usually subject to various surface treatments.

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Share on Facebook Share. Thus, the compression ring of the present invention has a composition comprising by mass 0.

Accordingly, the spheroidizing iis is conducted preferably in place of the second patenting treatment. The production method of the present invention using mass-produced steel defined by JIS contributes to cost reduction.

A method for producing a compression ring consisting of a composition consisting of by mass 0. About Our Company Otai Special Steel was established in to provide a wide range of high quality steel to the global market.

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, 4810 a method for producing such a compression ring.

Click for automatic bibliography generation. The batch treatment is inserted between continuous treatments in a conventional production line, inevitably resulting in lower productivity.

In the present invention, relatively large spheroidized cementite is dispersed in a tempered martensite matrix. Next Patent Gas turbine engine v Share on Pinterest Share.

This spheroidal cementite is known as residual cementite in spring steel subject to an oil-tempering treatment.

JIS G4801 Spring Steel Flat Bars SUP9,Spring Steel Sup7 Sup9

The results are shown in Table 2 and FIG. Bar or wire product for use in cold iis and method for producing the same.

Further, not only excellent characteristics but also price competitiveness are required on automobile parts such as piston rings. The relation between the thermal conductivity of the steel and the total amount of alloying elements is shown in FIG.


About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil. A SumoBrain Solutions Company. Materials with smaller jiis of alloying elements have higher thermal conductivities.

Image analysis conducted in the same manner as in Example 1 on scanning electron photomicrographs of the wire structures revealed that the spheroidal cementites in Examples 4 and 5 had average particle sizes of 0. Wear resistant sintered member and production method therefor.

Japanese Office Action, dated Feb. What is claimed is: Each rectangular cross-sectioned wire of 1. Process for setting the thermal conductivity of a steel, tool steel, in particular hot-work steel, and steel object.

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48011 SUP9A Spring main used for heavy vehicles, tractors, industrial production load, stress and the diameter of the larger plate spring and helical spring. 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. Of course, surface treatments such as plating, PVD, etc.

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