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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In Example 3 with a manganese phosphate coating, the difference of a substrate did not change the microwelding resistance life. In the present invention, relatively large spheroidized cementite is dispersed in a tempered martensite matrix. Spring steel superior in workability.

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 jjis sizes in a predetermined range.

The Formation jos Martensite. 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.

United States Patent The method of the present invention for producing a compression ring having a composition comprising by mass 0.

Accordingly, the spheroidizing annealing is conducted preferably in place of the second patenting treatment.

In Comparative Example 1, a rectangular cross-sectioned wire of 1. When good thermal conductivity is predominantly needed, a chromium plating is preferable, but when wear resistance and microwelding resistance are important, ion-plated CrN coatings are preferable, and DLC coatings are suitable for aluminum cylinders. Thus, the compression ring of the present invention has a composition comprising by mass 0. Namely, a peripheral surface of the compression 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 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. 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. Accordingly, knocking can be suppressed without needing such control as to delay ignition timing, keeping high thermal efficiency.

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Square Round sheet Plate. Process for the production of hardened parts of steel. We pride ourselves on our impeccable quality and service. A method for producing a compression ring consisting of a composition consisting of by mass 0.

Share on Twitter Tweet. SUP9A steels, Highlight the advantage is good hardenability, another hot working performance, comprehensive mechanical properties. Further, not only excellent characteristics but also price competitiveness are required on automobile parts such as piston rings.

The averaged values of the thermal sag resistance were shown in Table 2. In the present invention, the spheroidal cementite has an average particle size of 0. Thus, for the same compression rings, proper surface treatments may be selected depending on sliding mate members, use environment, etc. Wear resistant sintered member. Image analysis on an enlarged photomicrograph jiz this structure revealed that the spheroidal cementite had an average particle size of 0.

Also, from the economic point of view, steel used in a large amount, namely, mass-produced like materials defined by JIS Japanese Industrial Standards is inexpensive.

JIS G4801, for Spring Steels

Share on Pinterest Share. Example 1 was higher than the Si—Cr steel of Comparative Example 2 but lower than the hard steel wire of Comparative Example 5 in thermal conductivity, confirming that the thermal conductivity depends on the amounts of alloying elements.

When the microwelding occurs, the torque of a rotating shaft 2 changes, accompanied by temperature elevation. The production method of the present invention using mass-produced steel defined by JIS contributes to js reduction. Process for setting the thermal conductivity of a steel, tool steel, in particular hot-work steel, and steel object.

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Click for automatic bibliography generation. However, it does not have sufficient thermal sag resistance. 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. 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.

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Steels for Special Purposes | IRSteel

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. Alloy to be surface-coated and sliding members. About 30 min per 25 mm of ruling section is to be provided and then the steels should be immediately quenched in oil.

Because spheroidal cementite having a predetermined particle size, which is formed by the spheroidizing annealing, is influenced by subsequent heat treatments and affects 8401 drawing, the spheroidizing annealing is preferably conducted immediately before the last oil-tempering treatment. About Our Company Otai Special Steel was established in to provide a wide range of high quality steel to the global market.

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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.

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.

A usual measure against knocking is the delaying of ignition timing spark advancebut it makes it impossible to keep high thermal efficiency.

The compression ring of the present invention has a composition comprising by mass 0. 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. SUP9A steel stockholders and suppliers from china.