Specification 1.Alloy tool steel which offers good machinebaility. 2.Excellent polished finish for large section. 3.Supplied in the hardened and tempered condition. 4.Can be case hardened or nitrided. Application 1.Ideally suited for the production of plastic moulds. 2.High-gloss requirements of the mold application. 3.Large mold,such as fridge and air-conditioner. Chemical composition C Si Mn P S Cr Mo 0.35-0.45 0.20-0.40 1.30-1.60 â?¤0.030 â?¤0.030 1.80-2.10 0.15-0.25 Similar grade GB AISI/ASTM DIN JIS 4Cr2NiMnMo P20+Ni 1.2738 ---- -