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符合 JIS 规格的低碳铬铁,在精整破碎时会产生一定量(一般为1～10%)粒度为0.5～10毫米的碎屑,其筛分组成如下:粒度 >0.5mm 0.5～2mm 2～5mm 5～10mm% 2.8 49.5 24.7 23.0以这些碎屑为原料,在氮气和氨气中进行氮化处理。经多次试验后,发现其渗氮量与这些碎屑破碎后的存放时间有着一定关系(见图1):0.5～2 mm 的碎屑破碎后马上氮化(在1150℃经3小时)渗氮量可达6.5%。同样碎屑在空气中存放10天,渗氮量为
The low-carbon ferrochromium complying with the JIS standard will produce a certain amount (usually 1 to 10%) of crumbs with a particle size of 0.5 to 10 mm during the process of finishing and crushing, with the following sieving compositions: Particle size> 0.5mm 0.5-2mm 2 ~ 5mm 5 ~ 10mm% 2.8 49.5 24.7 23.0 Using these crumbs as raw materials, nitriding is performed in nitrogen and ammonia. After several tests, it was found that the amount of nitriding is related to the storage time of these fragments (see Fig. 1). Nitriding (after 3 hours at 1150 ° C) immediately after crushing of 0.5-2 mm Nitrogen up to 6.5%. The same debris stored in the air for 10 days, the amount of nitriding