Effect of Microstructural Characteristics on Mechanical Properties of Ferritic Stainless Steel

  • Mitsuhiro OkayasuEmail author
  • Tomoki Shigeoka


To improve the mechanical properties of hot-rolled ferritic stainless steel (SUS430), the microstructural characteristics of SUS430 were changed using a heating process under various conditions. The hardness of SUS430 decreased upon the increase in the heating temperature to 900 °C, and the hardness increased when the sample was heated to temperatures greater than 900 °C. The high hardness of the sample heated at 1000 °C (H1000 °C) is attributed to the heating time: A high hardness was obtained for a H1000 °C sample that was heated for 1 h (H1000 °C-1h), but this decreased when the heating time was increased to more than 1 h. The high hardness of H1000 °C-1h is caused by the fine Cr23C6 precipitates that are distributed in the sample around the grain boundaries. On the other hand, the large precipitates of Cr23C6 in H1000 °C-12h decrease the hardness. The hardness value of SUS430 is directly attributed to the mechanical properties and the ultimate tensile strength. The tensile strength of H1000 °C-1h was found to be about 200% and 20% higher than the as-received and H1000 °C-12h samples, respectively. Despite the increase in the tensile strength of the H1000 °C-1h sample, the ductility was not found to decrease significantly, for example, the fracture strain was approximately 25%. This occurrence is affected by a severe slip in the ferrite base grain, and the high strength of H1000 °C-1h is influenced by the interruption of the slip by the Cr23C6 precipitates. Unlike the tensile strength, similar fatigue properties were observed for both H1000 °C-1h and H1000 °C-12h, which is associated with the low crack driving force of H1000 °C-12h, caused by the roughness-induced crack closure arising from the large Cr23C6 precipitates.


ferrite heating mechanical property precipitation stainless steel 


Compliance with Ethical Standards

Conflict of interest

The authors declare no conflict of interest.


  1. 1.
    T. Fujita, Current Progress Temperature in Advanced High Cr Ferritic Steels for High Applications, ISIJ Int., 1992, 32, p 175–181CrossRefGoogle Scholar
  2. 2.
    S. Patra and L.K. Signghal, Influence of Hot Band Annealing and Cold Rolling on Texture and Ridging of 430 Stainless Steel Containing Aluminum, Mater. Sci. Appl., 2013, 4, p 70–76Google Scholar
  3. 3.
    N. Saito, M. Mabuchi, M. Nakanishi, I. Shigematsu, G. Yamauchi, and M. Nakamura, Application of Equal Channel Angular Extrusion on Strengthening of Ferritic Stainless Steel, J. Mater. Sci., 2001, 36, p 3229–3232CrossRefGoogle Scholar
  4. 4.
    A.K. Lakshminarayanan and V. Balasubramanian, An Assessment of Microstructure, Hardness, Tensile and Impact Strength of Friction Stir Welded Ferritic Stainless Steel Joints, Mater. Des., 2010, 31, p 4592–4600CrossRefGoogle Scholar
  5. 5.
    C.H. Hsu, C.K. Lin, K.H. Huang, and K.L. Ou, Improvement on Hardness and Corrosion Resistance of Ferritic Stainless Steel via PVD-(Ti, Cr)N Coatings, Surf. Coat. Technol., 2013, 231, p 380–384CrossRefGoogle Scholar
  6. 6.
    M.B. Cortie and H. Pollak, Embrittlement and Aging at 470 °C in an Experimental Ferritic Stainless Steel Containing 38 wt.% Chromium, Mater. Sci. Eng., A, 1995, 199, p 153–163CrossRefGoogle Scholar
  7. 7.
    A. Miyazaki, K. Takao, and O. Furukimi, Effect of Nb on The Proof Strength of Ferritic Stainless Steels at Elevated Temperatures, ISIJ Int., 2002, 42, p 916–920CrossRefGoogle Scholar
  8. 8.
    P.J. Grobner, The 885°F (470 °C) Embrittlement of Ferritic Stainless Steels, Metall. Trans., 1973, 4, p 251–260CrossRefGoogle Scholar
  9. 9.
    X. Zhang, Z. Wen, R. Dou, G. Zhou, and Z. Li, Evolution of Microstructure and Mechanical Properties of Cold-Rolled SUS430 Stainless Steel during a Continuous Annealing Process, Mater. Sci. Eng. A, 2014, 598, p 22–27CrossRefGoogle Scholar
  10. 10.
    K. Suzuki, S. Asami, and K. Suzuki, Formation of Ridging Related to the Banded Segregation Pattern of Cr and C on Ferritic Stainless Steel Sheet, Trans. ISIJ, 1983, 23, p 731–737CrossRefGoogle Scholar
  11. 11.
    X. Huang, D. Wang, and Y. Yang, Effect of Precipitation on Intergranular Corrosion Resistance of 430 Ferritic Stainless Steel, J. Iron. Steel Res. Int., 2015, 22, p 1062–1068CrossRefGoogle Scholar
  12. 12.
    J.H. Westbrook, Temperature Dependence of the Hardness of Secondary Phases Common in Turbine Bucket Alloys, J. Metal., 1957, 209, p 898–904Google Scholar
  13. 13.
    Y. Yazawa, Y. Kato, and M. Kobayashi, Development of Ti-Bearing High Performance Ferritic Stainless Steels R430XT and RSX-1, Kawasaki Steel Tech. Rep., 1999, 40, p 23–29Google Scholar
  14. 14.
    C.S. Bandara, S.C. Siriwardane, U.I. Dissanayake, R. Dissanayake, Prediction Methods of Stress Life Curves for Various Stress Ratios for Steels in the High Cycle Region, in ACEPS-2013, pp. 75–81.Google Scholar
  15. 15.
    N.B. Fredj, M.B. Nasr, A.B. Rhouma, C. Braham, and H. Sidhom, Fatigue ife Improvements of the AISI, 304 Stainless Steel Ground Surfaces by Wire Brushing, ASM Int., 2004, 13, p 564–574Google Scholar
  16. 16.
    A.M. Sherman, Fatigue Properties of Alloy Steels High Strength-Low Alloy Steels, Metall. Trans. A, 1975, 6, p 1035–1040CrossRefGoogle Scholar
  17. 17.
    M.L. Roessle and A. Fatemi, Strain-Controlled Fatigue Properties of Steels and Some Simple Approximations, Int. J. Fatigue, 2000, 22, p 495–511CrossRefGoogle Scholar
  18. 18.
    A.V. Makarov, E.S. Gorkunov, IYu Malygina, LKh Kogan, R.A. Savrai, and A.L. Osintseva, Eddy-Current Testing of the Hardness, Wear Resistance, and Thickness of Coatings Prepared by Gas–Powder Laser Cladding, Rus. J. Nondestr. Test., 2009, 45, p 797–805CrossRefGoogle Scholar
  19. 19.
    S. Ishihara, Y. Sugai, and A.J. McEvily, On the Distinction Between Plasticity- and Roughness-Induced Fatigue Crack Closure, Metall. Mater. Trans. A, 2012, 43A, p 3086–3096CrossRefGoogle Scholar

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© ASM International 2019

Authors and Affiliations

  1. 1.Graduate School of Natural Science and TechnologyOkayama UniversityOkayamaJapan

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