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Forging Steel Ck 55 Description
CK55 steel has a higher (0.55%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering.

Designation by Standards

·        Brand Name: Ck 5

·        Mat No1.1203

·        DIN Ck55

·        EN -

·        AISI 1055

Chemical Composition

Chemical Composition

APPLICATIONS

·        Steel for springs, for quenched and tempered springs, for surface hardened products like shafts, bushings, crankshafts, etc.

Physical Properties(average values) at ambient temperature

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Soft Annealing

·        Hardness after soft annealing 229 HB.

Hardening

·        Harden from a temperature of 840-870°C, 850-880°C followed by water or oil quenching.

Normalizing

·        Normalizing temperature (°C): 825-865°C.

Tempering

·        Tempering from the quenched condition may be done at 540 – 680°C depending upon the strength desired.

Mechanical Properties Vin Hardened+Tempered Condition

Forging

·        Hot forming temperature: 1100-850°C.

Corrosion Resistance

·        This is a steel alloy and will rust if not protected. it is not corrosion resistant.

Welding

·        CK55 steel is weldable by all of the welding methods. However with its higher carbon content it is important to use both pre-heat at 150 to 260°C and post-heat at 590 to 650°C practice per an approved welding procedure.

Cold working

·        CompoIn the annealed state the CK55 alloy is readily cold worked by conventional methods.

Physical Properties

THERMAL PROPERTIES