sigh007 发表于 2012-3-27 00:24:57

MIL-S-980B


                   MIL-S-980B, MILITARY SPECIFICATION: STEEL, CHROMIUM ALLOY, BARS (FOR TORPEDO GYROSCOPE BEARINGS) (02 JUL 1965).,   This specification covers spheroidized chromium alloy steel bars of special metallurgical quality in sizes 1 inch and under in diameter, for use in torpedo gyroscope bearings requiring a finish of minimum surface roughness.         
         
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