A new Pb-free machinable austenitic stainless steel

  • Di WuEmail author
  • Zhuang Li


The machinability tests were conducted by using various process parameters on a CA6164 lathe with a dynamometer. The metallurgical properties, machinability and mechanical properties of the developed alloy were compared with those of an austenite stainless steel 1Cr18Ni9Ti. The results show that the machinability of the austenitic stainless steels with free cutting additives is much better than that of 1Cr18Ni9Ti. This is attributed to the existence of machinable additives. The inclusions might be composed of MnS. Sulfur and copper addition contributes to the improvement of the machinability of austenitic stainless steel. Bismuth is an important factor to improve the machinability of austenitic stainless steel, and it has a distinct advantage over lead. The mechanical properties of the free cutting austenitic stainless steel are similar to those of lCrl8Ni9Ti. A new Pb-free austenitic stainless steel with high machinability as well as satisfactory mechanical properties has been developed.

Key words

Pb-free machinable austenitic stainless steel machinable additive bismuth machinability mechanical property 


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  1. [1]
    Sullivan O D, Cotterell M. Machinability of Austenitic Stainless Steel SS303 [J]. J Mater Process Technol, 2002, 124(1/2): 153.CrossRefGoogle Scholar
  2. [2]
    Leuschke U, Puwada N R, Senk D. Influence of Micro-Segregation in Pb-S-Alloyed Free Machining Steels on the Surface Quality of the Rolled Wire-Rod [J]. Metallurgia Italiana, 2008, 100(5): 5.Google Scholar
  3. [3]
    Hashimura M, Mizuno A, Miyanishi K. Effect of MnS Distribution on Machinability in Low Carbon Free-Cutting Steel [J]. Iron and Steel Technology, 2009, 6(9): 45.Google Scholar
  4. [4]
    Krishtal M A, Borgardt A A, Yashin Y D. Effect of Lead on the Machinability of Free-Cutting Steel [J]. Metal Science and Heat Treatment, 1977, 19(3/4): 178.CrossRefGoogle Scholar
  5. [5]
    Akasawa T, Sakurai H, Nakamura M, et al. Effects of Free-Cutting Additives on the Machinability of Austenitic Stainless Steels [J]. J Mater Process Technol, 2003, 143/144(1): 66.CrossRefGoogle Scholar
  6. [6]
    Kagechika H. Production and Technology of Iron and Steel in Japan During 2006 [J]. ISIJ Int, 2007, 47(6): 773.CrossRefGoogle Scholar
  7. [7]
    Bhattacharya D. New Free-Machining Steels With Bismuth [J]. I and SM, 1981, 8(3): 40.Google Scholar
  8. [8]
    Qi H S, Mills B. On the Formation Mechanism of Adherent Layers on a Cutting Tool [J]. Wear, 1996, 198(1–2): 192.CrossRefGoogle Scholar
  9. [9]
    Bletton O, Duet R, Pedarre P. Influence of Oxide Nature on the Machinability of 316L Stainless Steels [J]. Wear, 1990, 139(2): 179.CrossRefGoogle Scholar
  10. [10]
    Katayama S, Imai T. Effect of Tool Materials on Surface Machined Roughness and Cutting Force of Low-Carbon Resulfurized Free-Machining Steels [J]. ISIJ Int, 1990, 30(4): 331.CrossRefGoogle Scholar
  11. [11]
    Zaslavskii A Y. Mechanism of Improving the Machinability of Steel by Inclusions [J]. Metal Science and Heat Treatment, 1984, 26(9): 665.CrossRefGoogle Scholar
  12. [12]
    GENG H M, WU X C, MIN Y A, et al. Effect of Copper Addition on Mechanical Properties of 4Cr16Mo [J]. Acta Metallurgica Sinica: English Letters, 2008, 21(1): 43.CrossRefGoogle Scholar
  13. [13]
    Sakae K, Masayuki H. Effect of Carbon, Phosphorus and Nitrogen Contents in Steel on Machined Surface and Cutting Force [J]. ISIJ Int, 1990, 30(6): 457.CrossRefGoogle Scholar
  14. [14]
    Bellot J. Steels With Improved Machinability [J]. Metal Science and Heat Treatment, 1980, 22(11/12): 794.CrossRefGoogle Scholar
  15. [15]
    Kim S J, Lee C G, Lee T H, et al. Effect of Cu, Cr and Ni on Mechanical Properties of 0.15 wt. % C TRIP-Aided Cold Rolled Steels [J]. Scripta Materialia, 2003, 48: 539.CrossRefGoogle Scholar

Copyright information

© China Iron and Steel Research Institute Group 2010

Authors and Affiliations

  1. 1.State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang, LiaoningChina
  2. 2.School of Materials Science and EngineeringShenyang Institute of Aeronautical EngineeringShenyang, LiaoningChina

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