Fluid Ends of Mud Pump
1. The blank is made of high-strength alloy steel 35 CrMoA and 40
CrMoMn, with ultrasonic detection as forging, secondary refining by
electric furnace and deoxygenation if needed. After normalizing and
rough processing, the inner wall of the blank is quenched and
tempered until the rigidity meets HB285-330.
2. The forging pieces are forged three dimensionally with forging
ration of no less than 4.0:1.0. No defects such as interlining,
crack, impurities, delivery, overburning and weldment are
discovered in forgings which comply with JB/TQ252-81 after
examination of class III.
3. The curve of each cylinder in inner chamber is chamfered manually
or by the grinding wheel into circular arc R≥8, and is examined by the pressure test of 49Mpa and 1 hour.
4. Tests such as ultrasonic detection, magnetic particle detection,
size inspection and thermal test are performed.
5. Mechanical properties: σb≥850Mpa, σS≥670Mpa, σ≥5%,Ψ≥30%
