O2 | 1.2842 | 9Mn2V
Tool Steel O2 is a type of high-carbon tool steel that is often used in the production of knives, industrial tools, and machine components. UNS T31502 steel is renowned for its excellent strength and durability, making it perfect for use in a variety of industries. Here, we will explore the properties of this remarkable material and how it can be applied in various settings.
Description
Chemical Composition
| Standard | Grade | C | Si | Mn | Cr | P | S | Mo | V |
| ASTM | O2 | 0.85-0.95 | ≤0.50 | 1.40-1.80 | ≤0.50 | ≤0.03 | ≤0.03 | ≤0.03 | ≤0.03 |
| DIN | 1.2842 | 0.85-0.95 | 0.10-0.60 | 1.90-2.10 | 0.20-0.50 | ≤0.03 | ≤0.03 | 0.05-0.15 | |
| GB | 9Mn2V | 0.85-0.95 | ≤0.40 | 1.70-2.00 | ≤0.03 | ≤0.03 | 0.10-0.25 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements
Heat Treatment
Forging
Heat uniformly to 1000°C. Forge within a range of 850-1050°C reheating if necessary. Cool slowly (preferably in a furnace) to avoid setting up stresses
Annealing
O2 tool steel is supplied in the annealed and machineable condition. Re-annealing will only be necessary if the steel has been forged or hardened. To anneal, heat uniformly to 720°C, equalise, then furnace cool (hardness about 229 Brinell). Fully machined tools in grade O2 tool steel should be packed during annealing.
Hardening
Heat uniformly to 790-820°C until heated through. (If possible pre-heat at 300-500°C). Allow thirty minutes per 25 millimetre of ruling section and quench immediately in oil.
Martempering
Martempering of O2 tool steel is an alternative hardening procedure which may be used when suitable salt bath equipment is available.
Tempering
Heat the O2 tool steel uniformly and thoroughly at the selected tempering temperatures and hold for at least one hour per inch of total thickness.
Applications
Steel O2 is used as tool steel for universal use, highly stressed plastic moulds, mould inserts for high hardness and abrasive stress, blanking and stamping tools for all types cutting sheet metals up to 6 mm thickness, cold forming dies, cutting and punching tools of all types, shear blades for paper, plastic and metalworking industries, reamers, thread chasers and cutting tools, pressure pads, guide pins, taps, measuring tools, precision calipers and plug gauges, woodworking tools, plastic and rubber compression moulds, deep drawing tools, clipping.
