The spool of AAK hydraulic valve is made of high-grade tool steel with special heat treatment process. The hardness of the spool can reach 65HRC, which is even 7HRC higher than the 58HRC high-quality of the peers. Carson spent more than 2 months in making samples with 7 hydraulic valve factories. The hydraulic flow valves he got were all below 54HRC, while the hardness of AAK valve spool was 65hrc, which solved his urgent need.
At present, the hardness processing for precision parts from many hydraulic valve counterparts can not reach the high index. It seems to be qualified for domestic market, but far away from the high requirements of hydraulic valve products exported to overseas. First of all, these hydraulic valve factories do not have professional and systematic knowledge about how to choose the most suitable alloy steel material. Then, most importantly, the heat treatment is led by the processing plant, because the heat treatment is outsourcing processing, and 20% of the facto
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