DIN 17212 Grade Cf70 quenched and tempered (+QT)
DIN 17212 Grade Cf70 quenched and tempered (+QT) introduction
The in the quenched and tempered condition flame and induction hardenable unalloyed special steel has a, compared to the common quenched and tempered steel, constricted range of the C content and a lower maximum value of the P content.
The steel is suitable for flash welding, if prooved conditions will be kept.
For better machining the steel can be soft annealed. In this soft annealed and also in the normalised condition the material is unrestrained cold shearable.
A maximum value for nonmetallic inclusions by arrangement.
Delivery forms:
- semi-finished product, rolled or forged
- steel bars, hot-rolled or hot forged
- wire, hot-rolled
- sheet, strip and wide flats, hot-rolled
- tubes, coils, seamless
- open die and drop forgings
Application:
car industry, engine construction, mechanical engineering
DIN 17212 Grade Cf70 quenched and tempered (+QT) general
| Property |
Temperature |
Value |
Comment |
| Density |
23.0 °C |
Density of 7.8 g/cm³ |
Typical for Steel |
DIN 17212 Grade Cf70 quenched and tempered (+QT) chemical
| Property |
Value |
| Carbon |
Carbon of 0.68 - 0.75 % |
| Manganese |
Manganese of 0.2 - 0.35 % |
| Phosphorus |
Phosphorus of 0.03 % |
| Silicon |
Silicon of 0.15 - 0.35 % |
| Sulfur |
Sulfur of 0.035 % |
DIN 17212 Grade Cf70 quenched and tempered (+QT) mechanical
| Property |
Temperature |
Value |
Comment |
| Elastic modulus |
23.0 °C |
Elastic modulus of 190 - 210 GPa |
Typical for Steel |
| Elongation |
20.0 °C |
Elongation of 11 - 13 % |
- |
| Hardness, Rockwell F |
20.0 °C |
Hardness, Rockwell F of 60 [-] |
- |
| Poisson's ratio |
23.0 °C |
Poisson's ratio of 0.3 [-] |
Typical for Steel |
| Reduction of area |
20.0 °C |
Reduction of area of 25 - 30 % |
- |
| Tensile strength |
20.0 °C |
Tensile strength of 740 - 930 MPa |
- |
| Yield strength |
20.0 °C |
Yield strength of 480 - 560 MPa |
- |
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