Steel name: Mo–Nb–Cu–B Low Carbon Steel
  Diagram No.: 3549
  Type of diagram: TTT
  Chemical composition in weight %: 0.08% C, 1.5% Mn, 0.35% Si, 0.045% Nb, 0.25% Mo
  and 0.0015% B.
  Note: Low carbon steel. TTT diagram of the experimental steel PF: polygonal ferrite, QF:
  quasi-polygonal ferrite, AF: acicular ferrite, GB: granular bainite, LB: lath-like bainite,
  M: martensite.
  See the diagram No. 3550.
  Source: Y.T. Zhao, C.J. Shang, S.W. Yang, X.M. Wang, X.L. He, "The metastable austenite
  transformation in Mo–Nb–Cu–B low carbon steel", Materials Science and Engineering A,
  433 (2006), 169–174.

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