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Mat.No. 1.1186/DIN Ck40/AISI 1040

CK40 steel has a higher (0.40%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering to develop 150 to 250 ksi tensile strength.

 
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  • Mat.No. 1.1186/DIN Ck40/AISI 1040

  • Osaka

CK40 steel has a higher (0.40%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering to develop 150 to 250 ksi tensile strength. 


Designation by Standards


Mat. No.DINENAISI
1.1186Ck40-1040



Chemical Composition (in weight %)

CSiMnCrMoNiVWOthers
0.41max. 0.400.65max. 0.40max. 0.10max.0.40--(Cr+Mo+Ni) = max. 0.63


Applications 

Used for crankshafts, couplings and cold headed parts. 


Physical properties (avarage values) at ambient temperature

Modulus of elasticity [103 x N/mm2]: 210  

Density [g/cm3]: 7.84 


Soft Annealing 

Heat to 870-980oC, cool slowly in furnace. 


Normalizing 

Normalizing temperature: 890oC. 


Stress Relieving 

Stress relieving to remove machining stresses should be carried out by heating to approx. 590oC, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment. 


Hardening

Harden from a temperature of 840-898oC followed by water quenching. 


Tempering

Tempering from the quenched condition may be done at 320 to 700oC depending upon the strength desired. 


Forging

Hot forming temperature: 1100-850oC. 


Machinability

Machinability is good, rated at 60% that of the AISI 1112 alloy used as a 100% machining rated steel. 


Corrosion Resistance

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


Welding 

CK40 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 260oC and post-heat at 590 to 650oC practice per an approved welding procedure. 


Cold working

In the annealed state the CK40 alloy is readily cold worked by conventional methods. 


Forms manufactured

Please see the Dimensional Sales Program. 


Disclaimer

The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as the become available. Unless otherwise specified, registered trademarks are property of Metal Ravne company. Copyright 2015 by Metal Ravne. All rights reserved. Contact our Sales Office for more information.


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