1.2842 Tool Steel
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.
Relevant Steel
| USA | German | British | China |
| ASTM A681 | DIN EN ISO 4957 | BS 4659 | GB/T 1299 |
Chemical Composition
| ASTM A681 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| O2 / T31502 | 0.85 | 0.95 | 1.4 | 1.8 | 0.03 | 0.03 | . . . | 0.5 | . . . | 0.5 | . . . | 0.3 | . . . | 0.3 |
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| 1.2842 / 90MnCrV8 | 0.85 | 0.95 | 1.8 | 2.2 | 0.03 | 0.03 | 0.1 | 0.4 | 0.2 | 0.5 | 0.05 | 0.2 | . . . | . . . |
| BS 4659 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| B02 | 0.85 | 0.95 | 1.5 | 1.8 | 0.035 | 0.035 | . . . | 0.4 | . . . | . . . | . . . | 0.25 | . . . | . . . |
| GB/T 1299 | C | Mn | P | S | Si | Cr | V | Mo | ||||||
| 9Mn2V | 0.85 | 0.95 | 1.7 | 2 | 0.03 | 0.03 | . . . | 0.4 | . . . | . . . | 0.1 | 0.25 | . . . | . . . |
Forging
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.
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 |
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.
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