DIN 17222 Ck55 1.1203 Cold Rolled Steel Strips for Springs
Cold rolled steel strip for springs is distinguished by high dimensional accuracy and good surface quality and, in the cold rolled + hardened + tempered condition (H + A) offers the possibility of achieving high values of hardness, tensile strength and elastic limit.
Ck55 1.1203 Introduce
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.
Ck55 1.1203 Dimensions and permissible deviations
Thickness: 0.1 to 4mm; Tolerances: +/- 0.008 to 0.11 mm
Width: 10 to 600mm; Tolerances: +/- 0.15 to 0.60mm
Ck55 1.1203 Equivalent Grade
| Steel grade according to DIN 17 222 | Comparable grade according to EURONORM 132 |
| Code number | Material number |
| Ck55 | 1.1203 | 1 CS55 |
Ck55 1.1203 Chemical composition
| Steel number | grade number | C | Si | Mn | P | S |
| Ck55 | 1.1203 | 0.52 to 0,60 | 0,15 to 0,35 | 0,60 to 0,90 | 0,045 | 0,045 |
Ck55 1.1203 Treatment condition on delivery
Cold rolled + soft annealed : G
Cold rolled + hardened + tempered : H + A
Ck55 1.1203 Mechanical properties in the cold rolled + soft annealed condition G
| Steel number | grade number | Tensile strength N/mm2 maximum | Elongation at break (L = 80 mm) % minimum | Vickers hardness maximum |
| Ck55 | 1.1203 | 610 | 13 | 180 |
Ck55 1.1203 Tensile strength in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Tensile strength N/mm2 |
| Ck55 | 1.1203 | 1150 to 1650 |
Ck55 1.1203 Vickers hardness in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Vickers hardness |
| Ck55 | 1.1203 | 340 to 490 |
Ck55 1.1203 Surface condition
Strip to be supplied in the
1 cold rolled + soft annealed G or
2 cold rolled + soft annealed + cold rolled (G + K) condition
must have a bright, metallically clean surface.
Cold rolled + hardened + tempered (H + A) strip is supplied, as agreed at the time of ordering, with
1 grey-blue (GR),
2 bright (8K),
3 polished (P) or
4 polished and colour-tempered (P & AF) surface.
Ck55 1.1203 Types of heat treatment
Approximate values for heat treatment and minimum hardness values in the hardened condition of cold rolled steel strips for springs
| Steel number | grade number | Annealed °C | Hardened in oil at °C | Tempered to °C | Vickers hardness in hardened condition minimum |
| Ck55 | 1.1203 | 650 to 690 | 830 to 860 | 300 to 500 | 650 |
Ck55 1.1203 Acceptance testing and test certificates
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
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Ck55 1.1203 Cold Rolled Steel Strip Images
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