Alloys or metallic compositions – Ferrous – 1.7 percent or more carbon containing
Patent
1988-03-09
1989-12-26
Yee, Deborah
Alloys or metallic compositions
Ferrous
1.7 percent or more carbon containing
420 15, 420 16, 420 27, 420 29, 148 3, 148139, C22C 3704
Patent
active
048896870
ABSTRACT:
Nodular cast iron having favorable mechanical properties, in particular a high impact strength at low temperatures, comprising: from 3.0 to 4.0% of carbon; from 1.5 to 2.3% of silicon; less than 0.3% of manganese; not more than 0.03% of phosphorus; less than 0.10% of chromium; from 0.02 to 0.06% of magnesium; and from 0.0015 to 0.0150 weight % of bismuth with the balance consisting of iron and inevitable impurities and the CE (carbon equivalent) value being from 3.9 to 4.6%. This material is characterized by a low silicon content. Adding from 0.5 to 2.0% of nickel thereto improves its tensile strength and yield strength. Preferably, from 0.005 to 0.03% of bismuth is added to this nodular cast iron in molten state so as to produce more than 300 graphite nodules per mm.sup.2. The remaining bismuth content is preferably from 0.0015 to 0.015%, more preferably from 0.0015 to 0.004%. The resulting nodular cast iron has improved mechanical properties, in particular a high low temperature impact strength and can be used either as cast or after a ferritizing process.
Ishihara Yasuoki
Natsume Takeshi
Obato Fumio
Sakai Jun
Hitachi Metals Ltd.
Honda Giken Kogyo K.K.
Yee Deborah
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