Steel name: ASTM Grade 91
  Diagram No.: 4049
  Type of diagram: CCT
  Chemical composition in weight %: 0.08-0.12% C, 0.20-0.50% Si, 0.30-0.60% Mn, 0.020% P, 0.010% S,
  8.00-9.50% Cr, 0.85-1.05% Mo, 0.40% Ni, 0.06-0.10% Nb, 0.18-0.25% V, 0.04% Al, 0.030-0.070% N.
  Note: Martensitic Cr steel.
  Source: A. Di Gianfrancesco, L. Cipolla and F. Cirilli (1), G. Cumino and S. Caminada (2),
  MICROSTRUCTURAL STABILITY AND CREEP DATA ASSESSMENT OF TENARIS GRADES 91 AND 911,
  1-Centro Sviluppo Materiali S.p.A., Rome, 2-TenarisDalmine, Dalmine, Italy, 2008.

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