ALLOY INDEX steels

Properties Colorless, exceedingly mobile, fuming liquid suffocating odor. Corrosive to most metals when water is present in the absence of water it has practically no action on iron, steel, or the common metals and alloys, and can be stored and handled in metal equipment without danger. D 1.483 (20C), bulk d 12.4 lb/gal, fp -70C, bp 57.6C, refr index 1.412 (20C). Miscible with carbon tetrachloride, tin tetrachloride, titanium tetrachloride, and sulfur mono- and dichlorides decomposed by water and alcohol with evolution of hydrogen chloride. Noncombustible. 

Lanthanum has also found modest uses. Its oxide is an additive in high-quality optical glasses to which it imparts a high refractive index (sparkle) and has been suggested for a variety of catalytic uses. Mischmetal , an unseparated mixture of lanthanide metals containing about 25% La, is used in making lighter flints, and more importantly in the production of alloy steels, (p. 1232). 

Small amounts of tungsten and nitrogen in the alloy decrease susceptibihty of stainless steel to pitting. Sedriks [69] introduced pitting resistance equivalent number (PREN) as an index for stainless steel ... 

The second method of ASTM G 101 uses a predictive equation, based on the chemical composition of the steel, to calculate a corrosion resistance index. If the index for a specific steel composition falls within the range normally expected for weathering steel, the indication is that the steel in question contains sufficient alloying elements (in the proper proportion) such that it should perform as a weathering steel. Averages and ranges of corrosion resistance indices, taken from ASTM G 101, for ASTM A 242 and ASTM A 588 steels, ai shown in Table 3. 

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