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我厂生产的QGG型高精度机用平口钳,要求其尺寸稳定性好、耐磨,并具有一定的强度及韧性。原设计用CrWMn钢做钳身。经两年来的实践发现,由于锻造工艺不稳定,锻造后网状碳化物达到4级左右,这就需高温正火加球化退火,不仅电能消耗大,还会因网状碳化物消除不彻底,造成淬火后开裂或磨削裂纹,以致废品率高达50％以上。后来,我们改用gmn2V钢制造钳身,由于gmn2V钢碳化物
I plant QGG-type high-precision machine with flat-nose pliers, requiring its dimensional stability, wear-resistant, and has a certain strength and toughness. The original design of the body with CrWMn steel. After two years of practice found that because of forging process instability, forged mesh carbide reaches about 4, which requires high-temperature normalizing ball annealing, not only power consumption, but also due to the elimination of mesh carbide is not complete , Resulting in cracking or grinding cracks after quenching, resulting in rejection rate as high as 50%. Later, we use gmn2V steel to make the body, thanks to gmn2V steel carbides