Process for making railroad car truck wear plates

Details Process for making railroad car truck wear plates Process for making railroad car truck wear plates

1994-02-02

1996-05-21

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

With measuring, testing, or sensing

148645, 148661, C21D 804

Patent

active

055185576

ABSTRACT:
A process for making steel wear plates for use as railroad car truck side frame/bolster damping components utilizes the sequential steps of heating, pressing, quenching and then tempering. The heating process includes bringing the wear plate to a temperature of approximately 1750.degree. F. so that the plate is essentially 100 percent austenite. Generally uniform pressure is applied to the plate while heated to bring the plate to a desired flatness. Quenching fluid is thereafter applied to the flattened plate, while maintaining pressure thereon, to bring the plate to a predetermined brinnell hardness, a predetermined temperature, and a metallurgical characteristic of at least 90 percent martensite. The plate is thereafter tempered at a temperature of from 910.degree.-940.degree. F. for a period of time sufficient to bring the plate to a brinnell hardness less than the hardness after quenching.

REFERENCES:
patent: 3668917 (1972-06-01), Komatsu et al.

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