C si mn cr mo v p s 0.45-0.55 0.20-1.00 0.20-0.90 3.00-3.50 1.30-1.80 max 0.35 max0.030 max0.030 Mechanical property Annealing temperature: 815â°c-845 â°c Hardness after annealing hbw: 187-233 Quenching temperature: 925â°c-955 â°c Cooling medium: oil/ air cooling Tempering temperature: 205â°c-620 â°c Hardness after tempering hrc: 57-45 Located in chang'an town - the famous town of mould in pearl river delta; Providing complete services from manufacturing and marketing to distributing; Steel exported all over the world; Service like peeling, milling, grinding, cutting and heat treatment etc... All steel must pass high quality detection; 24/7 hours online service with quick response !