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special alloy steel
met. 特种合金钢; 特殊合金钢 (Special alloy steels containing aluminium and other elements are heated in ammonia to about 500°C;the gas decomposes to a certain extent into hydrogen and nitrogen ; the latter combines with the iron, forming particles of iron nitride which impart great hardness to the surface of the steel. 将含有铝和其他元素的特种合金钢在氨气中加热到 500°C 左右,部分氨气分解成氢和氮,氮和铁结合生成的氮化铁微粒会大幅度提高钢的表面硬度。)
space 特殊钢
tech. 特殊合金钢