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Carbon DIN 1.1191

Carbon structural steel for hardening and tempering

DIN 1.1191 is a classic carbon structural steel with a higher carbon content, known as C45 . It is widely used in general engineering for the production of stressed components that require good strength, surface hardness and fatigue resistance. In the basic state it has good machinability and is suitable for hardening or induction hardening .


Alternative designation: C45, ČSN 12050
Type: Carbon structural steel

Heat treatment:

  • Soft annealing: 650–700 °C

  • Refinement (hardening + tempering):

  • Quenching: 820–860 °C (oil)

  • Tempering: 480–680 °C depending on the required hardness

  • Induction hardening: local – common for shafts and pins

Round bars, rolled, forged

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Rolled, annealed sheets

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Mechanical properties of Toolox 33

  • Hardness (HBW): 275–325 (EN ISO 6506-1)

  • Notch resistance: min. 35 J (EN 1025, EN ISO 148)

  • Ultrasonic inspection: according to EN 10160


Features:

  • Good machinability in the annealed condition

  • High strength after tempering

  • Induction or conventional hardening option

  • Not suitable for welding in higher thicknesses (due to higher carbon content)

  • Limited corrosion resistance – surface protection required

  • Hardness after hardening up to approx. 58 HRC (with correct procedure)

Use:

  • Shafts, pins, gears, piston rods

  • Cylinders, rods, guide elements

  • Connecting and clamping parts

  • Medium-duty machine components

  • Parts requiring a hard surface and tough core after induction hardening

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