Microalloyed steel and process for preparing a railroad joint ba

Details Microalloyed steel and process for preparing a railroad joint ba Microalloyed steel and process for preparing a railroad joint ba

1989-06-29

1991-05-21

Yee, Deborah

Alloys or metallic compositions

Ferrous

Vanadium, tantalum or niobium containing

420128, 72201, 148320, C21D 713, C22C 3806

Patent

active

050173359

ABSTRACT:
A microalloyed, fully killed steel has a composition, in weight percent, of from about 0.20 to about 0.45 percent carbon, from about 0.90 to about 1.70 percent manganese, from about 0.10 to about 0.35 percent silicon, from about 0.01 to about 0.04 percent aluminum, from about 0.05 to about 0.20 percent vanadium, from about 0.008 to about 0.024 percent nitrogen, balance iron. The steel is particularly useful when hot rolled to a railway joint bar section, and air cooled. The resulting joint bar meets AREA specifications in the as-rolled condition, without the need for a reheat and oil quench heat treatment after rolling.

REFERENCES:
patent: 3173782 (1965-03-01), Melloy et al.
patent: 3472707 (1969-10-01), Phillips
patent: 3496032 (1970-02-01), Shimizu et al.
patent: 3562028 (1971-02-01), Heitmann et al.
patent: 3666452 (1972-05-01), Korchynsky et al.
patent: 3982969 (1976-09-01), Koros et al.
patent: 4806177 (1989-02-01), Held et al.
American Railway Engineering Association, "Specifications for High-Carbon Steel Joint Bars", 1969.
B. L. Bramfitt et al., "Development of Microalloyed Joint Bar", Bethlehem Steel Co. Research Department Report, dated Jul. 29, 1988.

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