... reach HB290-330 afer hardening and tempering process.Chemical composition of 1.2738: Elements CSiMnMoCrNiStandardContent(%) 0.30~0. ... , blow mold thermoplastics, commonly used in the manufacture of TV cabinet, washing machine, refrigerator inner shell, buckets ... furnace, electric annealing saw, etc.Detective equipment : functions of chemical annalysis, physics property and mechnical property, etc.YL : ...