DIN 17222 Ck75 1.1248 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.
Ck75 1.1248 Introduce
Ck75 1.1248 steel is one of the higher carbon steels used for high hardness in the fully hardened condition. In such condition the steel is more brittle than the lower carbon steels. Applications include springs.
Ck75 1.1248 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
Ck75 1.1248 Equivalent Grade
| Steel grade according to DIN 17 222 | Comparable grade according to EURONORM 132 |
| Code number | Material number |
| Ck75 | 1.1248 | 1 CS75 |
Ck75 1.1248 Chemical composition
| Steel number | grade number | C | Si | Mn | P | S |
| Ck75 | 1.1248 | 0,70 to 0,80 | 0,15 to D,35 | 0,60 to 0,80 | 0,045 | 0,045 |
Ck75 1.1248 Treatment condition on delivery
Cold rolled + soft annealed : G
Cold rolled + hardened + tempered : H + A
Ck75 1.1248 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 |
| Ck75 | 1.1248 | 640 | 12 | 190 |
Ck75 1.1248 Tensile strength in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Tensile strength N/mm2 |
| Ck75 | 1.1248 | 1320 to 1870 |
Ck75 1.1248 Vickers hardness in the cold rolled + hardened + tempered condition (H + A)
| Steel number | grade number | Vickers hardness |
| Ck75 | 1.1248 | 390 to 555 |
Ck75 1.1248 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.
Ck75 1.1248 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 |
| Ck75 | 1.1248 | 650 to 690 | 810 to 840 | 300 to 500 | 700 |
Ck75 1.1248 Acceptance testing and test certificates
EN 10204/3.1 with all relevant data reg. chem. composition, mech. properties and results of testing.
Product Tags:
|
|
Ck75 1.1248 Cold Rolled Steel Strip Images
|
