Abrasion resistant cast irons to ASTM A532 StandardASTM A532 Class III Type A machined nozzles and seats for power generation industry. . Class II Type B (15-3 ASTM A532 Class 2 Type B) · 20-1 ASTM A532 Class II Type D . After machining it is heat treated to approximately 600 BHN.heat treating astm a class ii type d,High-Alloy White Irons :: Total Materia ArticleSpecification ASTM A 532 covers the composition and hardness of the . and foundry man work together to specify the composition, heat treatment, and foundry . The Class I type D (Ni-Hard 4) alloy is a modified nickel-chromium iron that . The chromium-molybdenum irons (Class II of ASTM A532) contain 11 to 23% Cr.
heat treating astm a class ii type d