Ck60 1.1221 Cold Rolled Steel Strip
DIN 17222 Ck60 1.1221 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.
Ck60 1.1221 Introduce
Ck60 1.1221 Carbon Steel is a high-carbon steel of low hardenability; it may be used in the as-rolled, annealed, normalized or liquid-quenched-and-tempered condition, depending on the desired properties. It is normally hardened by austenitizing and quenching in oil; however, it may be quenched in water if precautions are taken to prevent cracking. Its many uses include springs.
Ck60 1.1221 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
Ck60 1.1221 Equivalent Grade
| Steel grade according to DIN 17 222 | Comparable grade according to EURONORM 132 | |
| Code number | Material number | |
| Ck60 | 1.1221 | 1 CS60 |
Ck60 1.1221 Chemical composition
| Steel number | grade number | C | Si | Mn | P | S |
| Ck60 | 1.1221 | 0.57 to 0,65 | 0,15 to 0,35 | 0,60 to 0,90 | 0,045 | 0,045 |
Ck60 1.1221 Treatment condition on delivery
Cold rolled + soft annealed : G
Cold rolled + hardened + tempered : H + A
Ck60 1.1221 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 |
| Ck60 | 1.1221 | 620 | 13 | 185 |
Ck60 1.1221 Tensile strength in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Tensile strength N/mm2 |
| Ck60 | 1.1221 | 1180 to 1680 |
Ck60 1.1221 Vickers hardness in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Vickers hardness |
| Ck60 | 1.1221 | 350 to 500 |
Ck60 1.1221 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.
Ck60 1.1221 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 |
| Ck60 | 1.1221 | 650 to 690 | 825 to 855 | 300 to 500 | 670 |
Ck60 1.1221 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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