Unalloyed carbon steel C55S, 1.1204, CS50, Ck55 for thermal improvement according to PN-EN 10132-4.
| Standards | Steel Grades | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | ||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Mo: | Ni: | Al: | Cu: | |
| EN / DIN | C55S - 1.1204 - C 55 S - Ck55 - Ck 55 - CS50 - CS 50 | |||||||||
| 0.52 - 0.60 | 0.60 - 0.90 | 0.15 - 0.35 | <0.025 | <0.025 | <0.40 | <0.10 | <0.40 | - | - | |
| EN 132 | 2CS55 - 2 CS 55 - 1.1203 | |||||||||
| 0.52 - 0.60 | 0.60 - 0.90 | 0.15 - 0.40 | <0.035 | <0.035 | - | - | - | - | - | |
| AFNOR | C50RR - XC 50 - XC50 | |||||||||
| 0.47 - 0.52 | 0.50 - 0.80 | 0.15 - 0.35 | <0.025 | <0.020 | <0.30 | <0.10 | <0.40 | <0.03 | - | |
| BS | CS50 - CS 50 | |||||||||
| 0.45 - 0.55 | 0.50 - 0.90 | 0.05 - 0.35 | <0.045 | <0.045 | - | - | - | - | - | |
| IS | 55C6 | |||||||||
| 0.50 - 0.60 | 0.50 - 0.65 | 0.15 - 0.35 | <0.05 | <0.05 | - | - | - | - | - | |
| EN | C55E - 1.1203 | |||||||||
| 0.52 - 0.60 | 0.60 - 0.90 | <0.40 | <0.03 | <0.035 | <0.40 | <0.10 | <0.40 | - | - | |
| PN | 55 - gat. 55 | |||||||||
| 0.52 - 0.60 | 0.60 - 0.90 | 0.10 - 0.40 | <0.04 | <0.04 | <0.30 | <0.10 | <0.30 | - | <0.30 | |
C55S, 1.1204 - specification and application
Spring steel with low hardening capacity designed for lightweight springs and springs, washers and spring elements, small tool blades, small dimensions equipment with carbon range of approx. 0.55% for heat improvement, patenting or cold deformation.
Supplied in the form of cold-rolled tapes and wires for oil hardening. After heat treatment, the steel exhibits a tempered martensite structure and is prone to decarburizing and oxidation during heat treatment.
Mechanical properties of C55S
| echanical properties according to EN 10132-4 | |||||
|---|---|---|---|---|---|
| Soft state after smoothing rolling +A +LC | |||||
| Tensile strength | Rm | < 600 MPa | |||
| Yield point | Re | < 480 MPa | |||
| Elongation | A | > 17% | |||
| Hardness | < 185 HV | < 90 HB | |||
| Condition after cold plastic deformation +CR | |||||
| Tensile strength | Rm | < 1070 MPa | |||
| Hardness | < 300 HV | ||||
| Condition after hardening and tempering in oil | |||||
| Tensile strength | Rm | 1100 - 1700 MPa | |||
| Hardness | HV | HRC | 340 - 520 HV | 34.0 - 50.50 HRC | |
| Density ρ | 7.82 kg/dm³ | ||||
In the C55S grade the company provides:
- Cold-rolled spring stripes / strips C55S
- Bars / sheets cut from stripes C55S
- Carbon drawn spring wires
Other grades of spring steel:
C55S, 1.1204, C 55 S, Ck55, Ck 55, CS50, CS 50, 2CS55, 2 CS 55, 1.1203, C50RR, XC 50, XC50, CS50, CS 50, 55C6, C55E, 1.1203, 55, gat. 55