30CrMo alloy steel plate belongs to national standard alloy structural steel, executive standard: GB/T 3077-1999 (technical conditions of alloy structural steel), unified number code: A30302.
30CrMo alloy steel plate has high strength and toughness, high hardenability, critical hardenability diameter in oil is 15-70mm; 30CrMo alloy steel plate has good thermal strength, enough high temperature strength below 500℃, but its strength decreases significantly at 550℃.
When the alloy element in 30CrMo alloy steel plate is at the lower limit, the welding is quite good, but the weldability is medium when the welding is near the upper limit, and it needs to be preheated to over 175 ℃ before welding.
30CrMo alloy steel plate has good machinability, medium plasticity in cold deformation, the first kind of temper brittleness in the range of 300-350℃ in heat treatment, and the tendency to form white spots.
30CrMo alloy steel plate is usually used in quenching and tempering state. When the carbon content is the lower limit, the steel can also be used as carburizing steel with higher core strength. In the medium-sized machinery manufacturing industry, it is mainly used to manufacture the quenched and tempered parts with large cross-section and working under high stress conditions, such as shafts, spindles, bolts, studs, gears and so on.
