Specification 1.Hot work tool steel. 2.Better toughness than conventional h13. 3.Fine grain size with high toughness. 4.High strength at elevated temperature. Application 1.Aluminium, magnesium.Casting dies. 2.Plastic thin wall mold. 3.Pressing forge dies. Chemical composition C Si Mn P S Cr V 0.30-0.43 0.80-1.20 0.20-0.50 Â?¤0.030 Â?¤0.030 4.75-5.50 0.30-0.60 Gb Aisi/astm Din Jis 4cr5mosiv H11 1.2343 Skd6