Applications:
- EN9 is used commonly for many general engineering applications.
- Typical applications include, shafts, axes, knives, bushes, crankshafts, screws, sickles, wood working drills and hammers.
Annealing:
Heat the steel slowly to 680-710°C, soak well.
Cool slowly in the furnace.
Hardening:
- Heat slowly to 820-840°C, soak well.
- Cool slowly in the furnace.
Tempering:
- Temper the EN9 steel component immediately after quenching whilst still hand warm.
- Re-heat to the tempering temperature then soak for one hour per 25 millimetre of total thickness (2 hours minimum) Cool in air.
- For most applications tempering of EN9 will be between 550-660°C.
Heat Treatment:
- Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each EN9 steel component.
- Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities.
- Please consult your heat treatment provider for full guidance on heat treatment of EN9 carbon steel.
Chemical composition:
| Carbon | 0.50-0.60% |
| Manganese | 0.50-0.80% |
| Silicon | 0.05-0.35% |
| Phosphorous | 0.06% max |
| Sulphur | 0.06% max |
Mechanical Properties:
| Condition | Tensile N/mm² | Yield N/mm² | Elongation % | Hardness Brinell |
| Normal | 600/700 MPa | 310 MPa | 13.00% | 201-255 |
| R | 690/850 MPa | 415 MPa | 14.00% | 201-255 |
| S | 770/930 MPa | 480 MPa | 14.00% | 223/277 |
| T | 850/1000 MPa | 570 MPa | 12.00% | 248/3 |
