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Mat.No. 1.1231/DIN Ck67/AISI 1070
Osaka
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
| Mat. No. | DIN | EN | AISI |
| 1.1203 | Ck55 | - | 1055 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.56 | max. 0.40 | 0.75 | max. 0.40 | max. 0.10 | max. 0.40 | - | - | (Cr+Mo+Ni) = max. 0.63 |
Applications
Steel for springs, for quenched and tempered springs, for surface hardened products like shafts, bushings, crankshafts, etc.Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Soft Annealing
Hardness after soft annealing is 229 HB.Normalizing
Normalizing temperature: 825-865oC.
Hardening
Harden from a temperature of 840-870oC, 850-880oC followed by water or oil quenching.
Tempering
Tempering from the quenched condition may be done at 540-680oC depending upon the strength desired.
Mechanical Properties in Hardened+Tempered Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation A5(%) | Reduction Z (%) |
| 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: 1100-850oC.Machinability
Machinability is good, rated at 50% 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
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 260oC and post-heat at 590 to 650oC practice per an approved welding procedure.
Cold working
In the annealed state the CK55 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 it becomes 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.
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
| Mat. No. | DIN | EN | AISI |
| 1.1203 | Ck55 | - | 1055 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.56 | max. 0.40 | 0.75 | max. 0.40 | max. 0.10 | max. 0.40 | - | - | (Cr+Mo+Ni) = max. 0.63 |
Applications
Steel for springs, for quenched and tempered springs, for surface hardened products like shafts, bushings, crankshafts, etc.Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Soft Annealing
Hardness after soft annealing is 229 HB.Normalizing
Normalizing temperature: 825-865oC.
Hardening
Harden from a temperature of 840-870oC, 850-880oC followed by water or oil quenching.
Tempering
Tempering from the quenched condition may be done at 540-680oC depending upon the strength desired.
Mechanical Properties in Hardened+Tempered Condition
| Diameter (mm) | 0.2 % proof stress (N/mm2) | Tensile strength (N/mm2) | Elongation A5(%) | Reduction Z (%) |
| 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: 1100-850oC.Machinability
Machinability is good, rated at 50% 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
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 260oC and post-heat at 590 to 650oC practice per an approved welding procedure.
Cold working
In the annealed state the CK55 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 it becomes 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.
