GBT 11251 30CrMo structural steel has high strength toughness and hardenability, the critical quenching diameter in oil is 15 ~ 70mm. And 30CrMo steel has good thermal strength. It has enough high temperature strength below 500℃, but its strength decreases at 550 degrees C. When the alloy elements are in the lower limit, the welding is quite good, but the welding is intermediate when the alloy elements content is close to the limit. 30CrMo structural steel is necessary to be preheat up to 175 degrees centigrade before welding.
GBT 11251 30CrMo structural steel has good machinability and medium plasticity during cold deformation; the first kind of tempering brittleness is in the range of 300~350 C during heat treatment, and has the tendency to form white spots.
GBT 11251 30CrMo structural steel is usually used in quenched and tempered condition. When the carbon content is lower, the 30CrMo steel can also be used as a carburizing steel with higher core strength. In medium mechanical manufacturing industry, 30CrMo steel is mainly used to manufacture the tempered parts with large section and working under high stress conditions.
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