День: 04/10/2026

To eliminate internal stresses in precision metal parts, the core approach is: heat the material to “loosen” the atoms, then cool it slowly to releasetress, while minimizing deformation and preserving hardness and strength. I. Stress Relief Annealing (Most Universal and Commonly Used)PrincipleHeat to a temperature below the phase transformation point, hold a period to allow…

Authenticity Identification of Jinan Qing Marble: 5 Steps for Precise DeterminationThe authenticity identification of inan Qing (a type of gabbroic granite) centers on appearance texture, density and weight, water absorption rate, tapping sound, and professional testing. Combined with origin and price character this allows for quick identification to avoid being deceived by Zhangqiu Qing, Fujian…