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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.
 
Grade Application:
  • Blanking and stamping dies,
  • Punches,
  • Rotary shear blades,
  • Thread cutting tools,
  • Milling cutters,
  • Reamers,
  • Measuring tools,
  • Gauging tools,
  • Wood working tools,
  • Broaches,
  • Chasers.
 
Equivalent grades:
STANDARDS
100MnCrW4
O1
DIN 2510
AISI O1
AFNOR 90MWCV5
JIS SKS3
 
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, M2, M35, M42, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.
 
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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
 
Mechanical Properties:
Maximum Stress(N/mm²)
Yield Stress(N/mm²)
Elongation
Impact Strength (joule)
Hardness value (BHN)
950
465
10%
25
288
 
Hardness:
Max. 230
 
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
 
Hardening:
Hardening °C – 780-820
 
Tempering:
 
Physical Properties:
Thermal Conductivity at °C
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 Reliving:
Stress-relief Annealing °C – approx. 650
 
Normalizing:
After normalizing hardness is 40 HRC given on Rockwell testing machine. It shows after normalizing the specimen becomes harder then annealing specimen, this is due to formation of Bainite & Martensite.
 
Annealing:
Soft Annealing °C – 750-780
 
Density:
8670 kg/m 3
 
Machinability:
 
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 risk of crack formation. But, this can be avoided with convinced specifications like pre heating, proper choice of 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 the three electrodes proved the 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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