General Studies · Material Testing

रॉकवेल कठोरता परीक्षण (Rockwell hardness test) HRC विधि में, डायमंड कोन इंडेंटर पर लगाया जाने वाला प्रारंभिक परीक्षण बल (प्रीलोड) कितना होता है?

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