JIS-S55C, SUP9, SUP7 and SUP12 Steels

Steel name: JIS-S55C, SUP9, SUP7 and SUP12
Diagram No.: 4996
Type of diagram: TTT
JIS designation: JIS-S55C, SUP9, SUP7 and SUP12 Steels
Chemical composition in weight %: 4996-2.jpg">See the table.
Steel group: Medium carbon steels
Note: A Time–Temperature-Transformation (TTT) diagram was made using change ratio of the length of the materials during each isothermal holding. The materials, cut into a diameter of fi 3 mm and 10 mm long, were austenitized at 1000°C for 400 s in a vacuum using formastor-F (Fuji Electronic Industrial Co., Ltd.), cooled down to the specified temperatures (300°C, 350°C, 400°C, 450°C, and 500°C) at 100°C/s by He gas, and isothermally held for various periods.
Reference: Not shown in this demo version.

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