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高速钢在铸造、热机械加工(锻造、冲压、轧制)、焊接以后,以及有时在淬火或回火后需要重新淬火时,均需进行退火。退火后的硬度,应保证较高的切削加工效率和避免在随后淬火时出现荼状断口。根据 FOCT—19265-73标准要求,退火后高速钢 P18、P12、P9、P6M3和 P6M5的硬度应≤HB255(～HRC24),而钴高速钢及高钒高速钢的硬度则可能达 HB269-285(HRC26-28)。为满足上述硬度要求,高速钢一般在850-870℃退火2—3小时,随
HSS is annealed after casting, thermomechanical processing (forging, stamping, rolling), after welding, and sometimes after quenching or tempering. After annealing the hardness, should ensure a higher cutting efficiency and avoid the occurrence of Tu-like fracture in the subsequent quenching. According to FOCT-19265-73, the hardness of high speed steel P18, P12, P9, P6M3 and P6M5 after annealing should be ≤HB255 (~ HRC24), while the hardness of cobalt high speed steel and high vanadium high speed steel may reach HB269-285 HRC26-28). In order to meet the above hardness requirements, high speed steel is generally annealed at 850-870 ° C for 2-3 hours