0.05C, 0.10C, 0.15C Boron Steels

Steel name: 0.05C, 0.10C, 0.15C Boron Steels
Diagram No.: 7269
Type of diagram: CCT
Chemical composition in weight %:
1.05C steel: 0.05% C, 0.31% Si, 1.52% Mn, 0.0020% B, 0.015% Ti, 0.020% Al
1.1C steel: 0.10% C, 0.31% Si, 1.52% Mn, 0.0023% B, 0.017% Ti, 0.036% Al
1.15C teel: 0.15% C, 0.31% Si, 1.50% Mn, 0.0020% B, 0.018% Ti, 0.041% Al
1.1C-Mo steel: 0.10% C, 0.31% Si, 1.50% Mn, 0.0021% B, 0.017% Ti, 0.034% Al, 0.50% Mo
1.1C-Cr steel: 0.10% C, 0.33% Si, 1.51% Mn, 0.0022% B, 0.015% Ti, 0.026% Al, 0.49% Cr
1.1C-Mo-Cr steel: 0.10% C, 0.33% Si, 1.52% Mn, 0.0022% B, 0.014% Ti, 0.024% Al, 0.50% Mo, 0.50% Cr
Steel group: Boron steels
Note: Top diagram: (a) Continuous cooling transformation (CCT) diagram and (b) hardness profile for the boron-bearing steel specimens with different carbon contents. The dotted parallel lines indicate the bainite start (Bs) and martensite start (Ms) temperatures calculated by empirical equations. A critical cooling rate (Vc-90) having the hardness corresponding to 90% martensite structure was measured from the hardness profile, as shown in the arrow for the 0.1C boron-baearing steel. The upper dark and lower bright symbols indicate the transformation start and finish temperatures, respectively.
Bottom diagram: (a) Continuous cooling transformation (CCT) diagram and (b) hardness profile for the 0.1C, 0.1C-Mo, 0.1C-Cr, 0.1C-Mo-Cr boron-bearing steel specimens. A critical cooling rate (Vc-90) having the hardness corresponding to 90% martensite structure was measured from the hardness profile, as shown in the arrow for the 0.1C boron-baearing steel. The upper dark and lower bright symbols indicate the transformation start and finish temperatures, respectively.
Reference: Not shown in this demo version.

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