AISI O2 tool steel is an oil hardening tool steel which is supplied in the annealed condition and characterised by its characteristics of offering good durability. Tool steel O2 is with excellent wear resistance and its ability to hold a good cutting edge. 02 steel is a good quality general purpose tool steel often used where the expense of a high carbon high chromium tool steel would not be justified.
AISI O2 steel has working hardness up to 63-65HRC. Steel O2 makes pretty decent performer for light/medium use knives at that hardness.
1.Supply Range of ASTM O2 Tool Steel
O2 Steel Round Bar: diameter 8mm – 350mm
O2 Steel Plate: thickness 2mm –300mm x width 200mm – 800mm
Other sizes of O2 material or as per customer’s requirements
Surface Finish: Black, Rough Machined, Turned or as per given requirements.
2. Relevant Steel Specification of AISI O2 Tool Steel
| USA | German | British | China |
| ASTM A681 | DIN EN ISO 4957 | BS 4659 | GB/T 1299 |
| O2 / T31502 | 1.2842 / 90MnCrV8 | B02 | 9Mn2V |
3. AISI O2 Tool Steel Chemical Composition & Other Equivalents
| ASTM A681 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| O2 / T31502 | 0.85 | 0.95 | 1.40 | 1.80 | 0.03 | 0.03 | . . . | 0.50 | . . . | 0.50 | . . . | 0.30 | . . . | 0.30 |
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| 1.2842 / 90MnCrV8 | 0.85 | 0.95 | 1.80 | 2.20 | 0.03 | 0.03 | 0.10 | 0.40 | 0.20 | 0.50 | 0.05 | 0.20 | . . . | . . . |
| BS 4659 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| B02 | 0.85 | 0.95 | 1.50 | 1.80 | 0.035 | 0.035 | . . . | 0.40 | . . . | . . . | . . . | 0.25 | . . . | . . . |
| GB/T 1299 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| 9Mn2V | 0.85 | 0.95 | 1.70 | 2.00 | 0.03 | 0.03 | . . . | 0.40 | . . . | . . . | 0.10 | 0.25 | . . . | . . . |
4. ASTM O2 Tool Steel Material Mechanical Properties
- Physical Properties
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density | 7.66 x 1000 kg/m3 | 25 | – |
- Mechanical Properties
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Density (×1000 kg/m3) | 7.66 | 25 | – |
| Poisson’s Ratio | 0.27-0.30 | 25 | – |
| Elastic Modulus (GPa) | 190-210 | 25 | – |
- Thermal Properties
| Properties | Conditions | ||
| T (°C) | Treatment | ||
| Thermal Expansion (10-6/ºC) | 11.2 | 20-100 more | – |
5. Forging of ASTM O2 Tool Steel
Heat O2 steel to 1000°C. Forge it within a range of 850-1050°C reheating if necessary. Cool slowly to avoid setting up stresses
6. AISI O2 Tool Steel Heat Treatment
- Annealing : 680 – 720 °C
- Hardness after annealing : Max. 220 HB
- Stress relieving : Approx. 650 °C
- Hot forming : 1050 – 850 °C
- Hardening : 790 – 820 °C
- Quenching media : Oil, Salt bath ( 220 – 250 °C ) up to 20 mm thickness
- Hardness after quenching : 63 – 65 HRC
- Hardness after tempering :
| 100℃ | 200℃ | 300℃ | 400℃ |
| 64HRC | 62HRC | 57HRC | 50HRC |
7. Applications for ASTM A681 O2 Tool Steel
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.
Contact us for any request of O2 tool steel materials. We will be a better choice.