CK55 steel has a higher carbon content for greater strength than the lower carbon alloys,it is harden-able by heat treatment,quench and tempering.
CK55 steel for springs,for quenched and tempered springs,for surface hardened products like shafts,bushings,crankshafts,etc.
CK55 steel chemical composition
| Grade | C % | Si % | Mn % | P % | S % | Cr% | Ni% | Mo% | ||
| CK55 | 0.52-0.60 | 0.04 | 0.60-0.90 | 0.030 | 0.050 | 0.40 | 0.40 | 0.1 | ||
CK55 steel Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength, ultimate | 660 MPa | 95700 psi |
| Tensile strength, yield | 560 MPa | 81200 psi |
| Modulus of elasticity | 190-210 GPa | 29700-30458 ksi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Poissons ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 10% | 10% |
| Reduction of area | 40% | 40% |
| Hardness, Brinell | 197 | 197 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (based on AISI 1212 steel. as 100 machinability) | 55 | 55 |
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