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:
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Blanking and stamping dies,
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Punches,
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Rotary shear blades,
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Thread cutting tools,
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Milling cutters,
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Reamers,
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Measuring tools,
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Gauging tools,
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Woodworking tools,
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Broaches,
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Chasers.
OHNS Equivalent grades:
STANDARDS |
100MnCrW4 |
O1 |
DIN 2510 |
AISI O1 |
AFNOR 90MWCV5 |
JIS SKS3 |
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS M2, M35, M42, DIN-1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTM SA-105 , SAE1018, SAE1010, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
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OHNS Chemical composition:
The following table shows the chemical composition of OHNS steel:
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 |
OHNS Mechanical Properties:
Maximum Stress(N/mm²) |
Yield Stress(N/mm²) |
Elongation |
Impact Strength (joule) |
Hardness value (BHN) |
950 |
465 |
10% |
25 |
288 |
OHNS Hardness:
Max. 230
OHNS Heat treatment:
Soft Annealing °C |
750-780 |
Cooling |
Furnace |
Hardness HB |
Max. 230 |
Stress-relief Annealing °C |
Approx. 650 |
Hardening °C |
780-820 |
Quenching |
Air, Oil, Salt Bath 180-220 °C |
Hardness after quenching HRC |
65 |
OHNS Hardening:
O1 steels should be heated uniformly to 780-820°C (1436-1508°F) until completely heated through. If needed, the steels can be preheated at 300-500°C (572-932°F). About 30 min/per 25 mm of the ruling section is to be provided and then the steels should be immediately quenched in oil.
OHNS Tempering:
Tempering of O1 steels is performed at 177-260°C (350-500°F) to realize Rockwell C hardness of 62 to 57.
OHNS Physical Properties:
Thermal Conductivity at °C |
W / (m*K) |
20 |
33.4 |
350 |
32.1 |
700 |
31.1 |
OHNS Thermal Properties:
Thermal conductivity (K) 24.27 Wm -l k -l
Thermal diffusivity (k : K/pC) 6.687 × 104 m2/s
OHNS 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).
OHNS Stress Relieving:
Stress-relief Annealing °C – approx. 650
OHNS Normalizing:
After normalizing hardness is 40 HRC given on the Rockwell testing machine. It shows after normalizing the specimen becomes harder the annealing specimen, this is due to the formation of Bainite & Martensite.
OHNS Annealing:
Soft Annealing °C – 750-780
OHNS Density:
8670 kg/m 3
OHNS Machinability:
The machinability of O1 steels is very good with a rating of 90% that of water hardening low alloy steels. The optimum parameters of turning operation of OHNS Steel plates were spindle speed 1500 RPM, feed rate 0.06 mm, and depth of cut 1 mm. However OHNS Steel plate having good machinability characteristic and Produce reasonable surface finish. Spindle speed is a dominating parameter of the machining time turning process.
OHNS Welding:
The Oil Hardening Non-Shrinking (OHNS) die steel refers to a variety of carbon and alloy steels that are particularly well-suited for making tools. Though these steels are weldable, there is a risk of crack formation. But, this can be avoided with convinced specifications like preheating, proper choice of the electrode, etc., In the present work, OHNS die steel is welded with three different electrodes. The chosen electrodes were mild steel electrode, E312-16 chromium-based electrode, and E-NiCrFe-3 nickel-based electrode. The OHNS steel is welded with these three electrodes and the welded specimens were examined for hot cracking tendency and mechanical properties of the joint. The hot cracking tendency was assessed by Houldcroft’s weldability test (Fishbone test). All three electrodes proved good results in terms of hot crack resistance and the specimen welded with E312-16 chromium-based electrode provides good mechanical properties.
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