OHNS
OHNS Grade Introduction:
OHNS steel is a general-purpose tool steel that is typically used in applications where alloy steels cannot provide sufficient hardness, strength, and wear resistance. Chemical composition of OHNS is Carbon 0.94%, Manganese 1.2%, Silicon 0.30%, Chromium 0.50% and Vanadium 0.15%.
Din 2379 Consolidates maximum wear resistance, great durability, exceptional front line maintenance, and treating resistance 12 % ledeburitic chromium steel. It can be nitrided after special heat treatment. It can be utilized as threading rolls and dies, icy trimming, cutting and stamping tools for sheet thickness’s up to 6 mm, accuracy cutting instruments for sheet thicknesses up to 12 mm.
OHNS Grade Application:
- Blanking and stamping dies
- Punches
- Rotary shear blades
- Thread cutting tools
- Milling cutters
- Reamers
- Measuring tools
OHNS Equivalent Grades:
| STANDARDS |
100MnCrW4 |
O1 |
DIN 2510 |
AISI O1 |
AFNOR 90MWCV5 |
JIS SKS3 |
OHNS Chemical Composition:
| Element |
C |
Si |
Mn |
P |
S |
Cr |
W |
| Content (%) |
0.85-1.00 |
0.15-0.35 |
1.00-1.20 |
0.03 Max |
0.03 Max |
0.50-0.70 |
0.50-0.70 |
Mechanical Properties:
| Maximum Stress (N/mm²) |
Yield Stress (N/mm²) |
Elongation |
Impact Strength (joule) |
Hardness value (BHN) |
| 950 |
465 |
10% |
25 |
288 |
Physical Properties:
| Temperature (°C) |
Thermal Conductivity (W / (m*K)) |
| 20 |
33.4 |
| 350 |
32.1 |
| 700 |
31.1 |
Thermal Properties:
| Thermal conductivity (K) 24.27 Wm -l k -l |
Thermal diffusivity (k : K/pC) 6.687 × 104 m2/s |
Forging Properties:
Forging of Ohns O1 steels can be performed at 1038°C (1900°F) down to 857°C (1575°F) but not below 816°C (1550°F).
Stress Relieving:
Stress-relief Annealing °C – approx. 650