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

Properties	Metric	Imperial
Density	7.85 g/cc	0.284 lb/in3

 

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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Properties	Metric
Modulus of elasticity [10^3x N/mm2]	210
Density [lbs/in3]	7.85

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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

Diameter	0.2% proof stress	Tensile strength	Elongation A5	Reduction Z
(mm)	(Wmm 2 )	(Wmm2)	(%)	(%)
up to 16*	540	780-930	12	25
17-40	460	740-890	14	35
41-100	420	700-850	15	40
up to 16	430	630-780	17	40

 

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

Quantity	Value	Unit
Thermal expansion	16 - 17	e-6/K
Thermal conductivity	16 - 16	W/m.K
Specific heat	500 - 500	J/kg.K
Melting temperature	1370 - 1400	°C
Service temperature	0 - 500	°C
Density	8000 - 8000	kg/m3
Resistivity	0.7 - 0.7	Ohm.mm2/m

THERMAL PROPERTIES

Properties		Conditions
		T (°C)	Treatment
Thermal Conductivity (W/m-K)	42.7	100
Specific Heat (J/kg-K)	477	50-100