Corrosion Resistance of ASSAB Stavax ESR Stainless Steel by Heat and Cold Treatment

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  • Han Lee-Long
    Graduate Institute of Mechanical and Electrical Engineering, National Taipei University of Technology
  • Lin Chun-Ming
    Graduate Institute of Mechanical and Electrical Engineering, National Taipei University of Technology
  • Shih Yih-Shiun
    Department of Mechanical Engineering, National Taipei University of Technology

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This study compared cryogenic treatment, ultra-cryogenic treatment, and high-low temperature tempering treatment using ASSAB Stavax ESR, and conducted the following analyses of the prepared specimens: (1) analysis the structure by X-ray diffraction, (3) analysis of the texture of the processed specimens by optical microscopy, (2) using a hardness tester to analyze the changes in hardness of specimens processed by cryogenic and heat treatment, (3) analyzing the hydrophilicity and hydrophobicity by the water contact angle test, and (4) analyzing corrosion resistance by the corrosion resistance test. The experimental results showed that cryogenic temperature affects the amount and shape of the carbides, which are significantly reduced in cases of high-temperature tempering. The water contact angle test analysis showed that the coating film’s water contact angle performance is the best, followed by specimens of ultra-cryogenic treatment, specimens of cryogenic treatment, and specimens of traditional heat treatment. It was found that cryogenic treatment can increase polishability, and empower the specimens with good mold release performance. The coating-film corrosion resistance test showed that ultra-cryogenic treatment and cryogenic treatment can improve corrosion resistance; however, the performances of specimens by traditional heat treatment were the worst.

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