| 摘要 |
PURPOSE: CN-12 and CF8C stainless steel alloys and articles made therefrom having excellent high temperature strength, creep resistance and aging resistance, with reduced niobium carbides, manganese sulfides, and chrome carbides along grain and substructure boundaries are provided. CONSTITUTION: The stainless steel alloy comprises from about 0.5 wt.% to about 10 wt.% manganese and less than about 0.15 wt.% sulfur, wherein the alloy is a CN-12 alloy or a CF8C alloy, the stainless steel alloy further comprises from about 0.2 wt.% to about 0.5 wt.% carbon and from about 1 wt.% to about 2.5 wt.% niobium, the alloy is a CF8C alloy wherein niobium and carbon are present in a weight ratio of niobium to carbon ranging from about 8 to about 11, the stainless steel alloy further comprises from about 0.02 wt.% to about 0.5 wt.% nitrogen, from about 0.8 wt.% silicon or less, from about 3.0 wt.% copper or less, from about 0.3 wt.% to about 1 wt.% niobium, from about 0.2 wt.% titanium or less, from about 5.0 wt.% cobalt or less, from about 3.0 wt.% aluminum or less, from about 0.01 wt.% boron or less, and from about 3.0 wt.% tungsten or less, the alloy is a CN-12 alloy and wherein nitrogen and carbon are present in a cumulative amount ranging from 0.4 wt.% to 1.0 wt.%, and the alloy is a CF8C alloy and wherein nitrogen and carbon are present in a cumulative amount ranging from 0.1 wt.% to 0.5 wt.%. The CN-12 stainless steel alloy comprises about 0.03 wt.% or less sulfur, from about 2 wt.% to about 5 wt.% of manganese, and niobium and carbon in a niobium:carbon wt.% ratio ranging from about 3.5 to 5.0. The stainless steel alloy comprises from about 2 wt.% to about 5 wt.% of manganese, less than about 0.03 wt.% of sulfur and about 0.5 wt.% nitrogen or less.
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