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作为化肥厂氨合成系统的中置式锅炉管线及其配件用钢,要求在中温(400℃)、高压(320公斤/厘米~2)和氢氮氨介质(H_2:N_2=3:1,NH_3=14～16%)条件下,具有良好的耐蚀性能,良好的加工制造、焊接以及综合机械性能等。因为使用条件苛刻,国外均采用铬钼系钢号。如:西德采用 N8(17CrMoV1O)、N10(21CrMoVW10);美国采用 ASTMA387D(2(1/4)Cr-1Mo)钢和不锈钢等。上述钢种虽已广泛应用,但由于合金
As the steel of central boiler and its accessories of the ammonia synthesis system of fertilizer plant, it is required to treat the steel in medium temperature (400 ℃), high pressure (320 kg / cm ~ 2) and NH3 ammonia medium (H_2: N_2 = 14 ~ 16%) conditions, has good corrosion resistance, good manufacturing, welding and mechanical properties and so on. Because of the harsh conditions of use, foreign countries are used chrome molybdenum steel. Such as: West Germany N8 (17CrMoV1O), N10 (21CrMoVW10); the United States using ASTMA387D (2 (1/4) Cr-1Mo) steel and stainless steel. Although the above-mentioned steel has been widely used, but due to the alloy