Low alloy steel

Details Low alloy steel Low alloy steel

2006-07-11

2006-07-11

Kastler, Scott (Department: 1742)

Metal treatment

Stock

Ferrous

C148S540000, C420S110000

Reexamination Certificate

active

07074283

ABSTRACT:
A low alloy steel, characterized by consisting of, by mass %, C: 0.2–0.55%, Si: 0.05–0.5%, Mn: 0.1–1%, S: 0.0005–0.01%, O(Oxygen): 0.0010–0.01%, Al: 0.005–0.05%, Ca: 0.0003–0.007%, Ti: 0.005–0.05%, Cr: 0.1–1.5%, Mo: 0.1–1% and Nb: 0.005–0.1%, and the balance Fe and impurities; and also characterized by the impurities whose contents are restricted to P≦0.03% and N≦0.015%; and further characterized by containing composites of inclusions of not greater than 7 μm in major axis with appearance frequency of not less than 10 pieces of composites per 0.1 mm2of the steel cross section, wherein the composite comprises an outer shell of carbonitride of Ti and/or Nb surrounding a nucleus of oxysulfide of Al and Ca.The low alloy steel suppresses pitting caused by inclusions and suppresses SSC induced by pitting.

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Machine-English translation of Japanese patent 2001-172739, Abe Toshiharu, Jun. 6, 2001.

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