Steel name: Low Carbon 3Mn-1Cr Steel
  Diagram No.: 3501
  Type of diagram: TTT
  Chemical composition in weight %:
  Steel 1 (a): 0.0041% C, 0.19% Si, 2.98% Mn, 0.003% S, 0.002% P, 1.00% Cr, 0.010% Nb,
  0.010% Ti, 0.018% Al.
  Steel 2 (b): 0.010% C, 0.19% Si, 2.99% Mn, 0.003% S, 0.002% P, 1.01% Cr, 0.012% Nb,
  0.011% Ti, 0.018% Al. 0.0014% B.
  Steel 3 (c): 0.040% C, 0.20% Si, 3.00% Mn, 0.002% S, 0.002% P, 1.00% Cr, 0.030% Nb,
  0.021% Ti, 0.019% Al. 0.0013% B.
  Steel 4 (d): 0.074% C, 0.20% Si, 2.97% Mn, 0.003% S, 0.002% P, 1.00% Cr, 0.030% Nb,
  0.020% Ti, 0.018% Al. 0.0013% B.
  Note: Low carbon steel. Austenitized at X^oC.
  Source: Yun Chul Jung, Kiyomichi Nakai, Hiroyuki Ohtsubo and Yasuya Ohmori,
  "Isothermal Transformation Behaviour of Extremely Low Carbon 3%Mn-1%Cr Steels",
  ISIJ International, Vol. 34 (1994), No. 1, pp. 43-50.

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