Meaning
Internal forces that distort the atomic arrangement within a crystalline solid influence the long-term mechanical stability of manufactured metals. This lattice stress occurs during rapid thermal transitions or mechanical deformation in metallurgical processes. Monitoring these internal forces prevents sudden material cracking.
Material Regulation
The State Administration for Market Regulation defines strict limits for residual internal forces in steel and alloy components under national safety standards. For critical machinery, high lattice stress must be relieved through thermal treatments specified by industrial regulations. These laws prevent the deployment of unstable metals in public infrastructure and transportation systems.
Compliance must be documented in the material certificates.
Testing Routine
Regulatory verification relies on X-ray diffraction techniques to measure the distortion of the crystal planes. The China National Accreditation Service for Conformity Assessment monitors the laboratories that perform these tests. During factory inspections, auditors check the alignment between these measurement records and the furnace temperature logs used during stress-relief annealing.
This ensures the data is genuine.
Liability Boundary
If a structural failure occurs due to unresolved lattice stress, the PRC Tort Liability Law imposes strict liability on the component manufacturer. The foreign joint venture cannot shift this liability to sub-suppliers unless a specific indemnity clause has been registered with the local bureau of industry. The failure to perform required stress-relief tests constitutes a presumption of negligence in domestic courts.
Thus, thorough record-keeping is a vital legal shield.
