Description
OHNS Grade Introduction:
OHNS Steel (Oil-Hardened Non-Shrinking steel) is a versatile tool steel commonly used when alloy steels cannot provide sufficient hardness, strength, and wear resistance. It is widely applied in tool-making and manufacturing of high-stress mechanical components. Its chemical composition includes Carbon (0.94%), Manganese (1.2%), Silicon (0.30%), Chromium (0.50%), and Vanadium (0.15%), which ensures excellent hardness and wear resistance while retaining good machinability.
DIN 2379 Overview:
DIN 2379 steel combines maximum wear resistance, high durability, and superior edge retention. This 12% ledeburitic chromium steel is suitable for precision cutting tools, stamping dies, and threading rolls. DIN 2379 is ideal for cutting tools used on sheets up to 6-12 mm thick. It can also be nitrided after specialized heat treatment.
OHNS Grade Application:
Typical applications of OHNS steel include:
- Blanking and stamping dies
- Punches
- Rotary shear blades
- Thread cutting tools
- Milling cutters
- Reamers
- Measuring and gauging tools
- Woodworking tools
- Broaches and chasers
OHNS Equivalent Grades:
| Standard | Equivalent Grades |
|---|---|
| DIN | 100MnCrW4 |
| AISI | O1 |
| AFNOR | 90MWCV5 |
| JIS | SKS3 |
| DIN 2510 | O1 |
Additional Grades Available:
We also offer additional steel grades including EN1A, EN8, EN24, EN31, D2, H13, SCM420, and many more.
OHNS Chemical Composition:
| Element | C | Si | Mn | P (Max) | S (Max) | 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 |
OHNS Mechanical Properties:
| Property | Value |
|---|---|
| Max Stress (N/mm²) | 950 |
| Yield Stress (N/mm²) | 465 |
| Elongation | 10% |
| Impact Strength (J) | 25 |
| Hardness (BHN) | 288 |
OHNS Hardness:
The maximum achievable hardness for OHNS steel is 230 HBW.
OHNS Heat Treatment:
- Soft Annealing: Performed at 750-780°C with furnace cooling. The target hardness after annealing is 230 HBW.
- Stress-Relief Annealing: Conducted at approx. 650°C to relieve internal stresses.
- Hardening: Heat to 780-820°C, then quench in oil, air, or salt bath at 180-220°C, achieving hardness up to 65 HRC.
OHNS Hardening:
Uniformly heat OHNS steel to 780-820°C (1436-1508°F). Preheating at 300-500°C is optional. After heating, quench in oil immediately for maximum hardness.
OHNS Tempering:
Tempering is done at 177-260°C (350-500°F), providing a Rockwell C hardness between 57 and 62 depending on the desired properties.
OHNS Physical Properties:
| Property | Value |
|---|---|
| Density | 8670 kg/m³ |
| Thermal Conductivity (W/m*K) | 20°C: 33.4 |
| 350°C: 32.1 | |
| 700°C: 31.1 |
OHNS Forging Properties:
OHNS steel can be forged between 1038°C (1900°F) and 857°C (1575°F), but forging below 816°C (1550°F) is not recommended to avoid damaging the steel.
OHNS Machinability:
OHNS steel offers 90% machinability relative to water-hardening low alloy steels. Optimal machining parameters include a spindle speed of 1500 RPM, feed rate of 0.06 mm, and a 1 mm depth of cut.
OHNS Welding:
Although weldable, care must be taken to avoid cracking during the welding process. This can be achieved by preheating and using the correct welding techniques. OHNS is typically welded with mild steel electrodes, chromium-based electrodes (E312-16), or nickel-based electrodes (E-NiCrFe-3). All three options perform well in terms of crack resistance and joint strength.
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