Changchun Huir Technology Co., Ltd. is a a technology-based enterprise specializing in material testing and inspection, chemical analysis and testing; testing technology consulting services; instrument and equipment calibration, inspection and testing; R&D, consulting, service and technology transfer in photoelectric mechanical products and mechanical and electrical  products. The company has rich experimental experience in metal material tensile test, standard stress-strain test, true stress-strain test, fatigue test, confirmatory fatigue test, S-N (P-S-N) reliability curve test, metallographic inspection and hardness test, and offers accurate, scientific and reliable data. A large...