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Power generation equipment forgings technical conditions

Release time:

2022-04-08

The main shaft ingot is used for direct forging. The axis of the main shaft should be kept consistent with the center line of the ingot as far as possible, and both ends of the ingot should be fully cut off so that the main shaft has no shrinkage holes, serious segregation and other harmful defects. The main shaft of the power generation equipment forging is formed by forging equipment with sufficient tonnage, and the forging ratio is greater than 3.5 to ensure forging penetration and uniform structure. Unless otherwise stipulated in the order contract, the good end of the ingot must be the flange end. After the spindle performance heat treatment, check the uniformity of Gauss hardness, so that the hardness difference of the same spindle surface does not exceed 30HBW. There are no defects such as cracks, gate points, shrinkage holes, fractures, serious segregation, and serious non-gold inclusions agglomeration on the main shaft that affect the performance and surface quality. The inner hole surface inspection is carried out on the spindle with center hole, the inner hole surface is clean, free of dirt, heat peeling, rust, tool debris, grinding marks, scratches and spiral flow lines, etc., and the transition between different hole diameters is smooth, no sharp Angle or sharp edge, then, let's learn about the technical conditions of power generation equipment forgings!
1. Ultrasound examination
For forgings of power generation equipment, the main shaft is subjected to quenching and tempering heat treatment to roughen the surface of the car, and then 100% ultrasonic inspection is carried out. The supplier must ensure that the inspection results meet the following requirements.
a) Dispersion defects with a flat-bottomed equivalent hole diameter of less than 3 mm are not counted, and defects with a flat-bottomed equivalent hole diameter of more than 3 mm should be recorded; b) The equivalent diameter of each point-like discontinuous flat-bottomed hole equivalent diameter defect is larger and can be tolerated to a diameter of 5 mm; c ) There shall be no dense point-like discontinuities and long-strip discontinuities with a diameter of more than 3mm of halo flat bottom holes; d) The reduction coefficient of the bottom wave shall be below 0.5.
2. Magnetic particle inspection
After the forging spindle of power generation equipment is finished on the outer valve surface, magnetic particle inspection is carried out on the entire abduction surface and both ends of the spindle. The supplier must ensure that the inspection results meet the following requirements.
a) The recording limit is more than 1mm, and the evaluation limit is 148mmX105mm; b) The maximum length l allowed by each linear mark and the maximum length Lg allowed by the discharge mark is 2mm; c) The allowed accumulation of linear magnetic marks in the evaluation frame is larger The length is 5 mm; d) the size of a single circular magnetic mark allowed in the evaluation frame is 10 mm;
e) The maximum number of magnetic traces allowed in the evaluation frame is 5.
3. Crystal size
The average grain size of the spindle after quenching and tempering must be above 6.0.
4. Dimensions and surface roughness
The machined spindle should meet the size, tolerance and surface roughness requirements specified in the ordering mode.
The above is the technical conditions of power generation equipment forgings, if you want to know more, please feel free to contact us!