Steel O2 As-Quenched
Heat-treated state
AISI/SAE O2 · UNS T31502 · EN 1.2842, 90MnCrV8 · GB 9Mn2V
Intermediate condition only — maximum hardness but brittle; must be tempered immediately.
Values for the As-Quenched condition
Other O2 tempers and conditions
O2 is listed in 5 conditions; see the grade overview at O2.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
AnnealedDefault spheroidize annealed (soft, as-supplied bar / ground flat stock) | Standard stock condition for machining, drilling and grinding before hardening. | 420 | 740 | 25 | 205 HB | — |
h9–h11 bar and flat stock | Annealed material supplied to close size and finish so only the working faces need machining. | 520 | 800 | 15 | 19 HRC | 8 % IACS |
Hardened & Tempered 54–56 HRC | Highest-toughness tempered condition for shear blades and impact-loaded punches. | 1,600 | 1,850 | 3 | 55 HRC | 6.6 % IACS |
oil quench + 150–200 °C temper | Standard working condition for blanking dies, gauges and knife/cutting edges needing maximum wear resistance. | 1,900 | 2,200 | 1 | 61 HRC | — |
As-QuenchedThis page 790–815 °C, oil quench, untempered | Intermediate condition only — maximum hardness but brittle; must be tempered immediately. | 2,000 | 2,200 | 0.5 | 64 HRC | 5.7 % IACS |
What is O2 As-Quenched?
O2 As-Quenched is O2 heat treated to As-Quenched — intermediate condition only — maximum hardness but brittle; must be tempered immediately. O2 As-Quenched has a yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,200 MPa (319 ksi) — stronger than 100% of steel grades. Elongation at break is 0.5% and the elastic modulus is 205 GPa (29.7 Msi). O2 As-Quenched has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,400°C (2,552 °F). Annealed is the default condition FabDigit quotes; As-Quenched is available on request or by drawing note.
Advantages
- High strength — 2,000 MPa (290 ksi), better than 100% of steel grades
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- Limited ductility — 0.5%, worse than 100% of steel grades
- Difficult to machine — 3/100, worse than 100% of steel grades
- Difficult to weld — 2/100, worse than 100% of steel grades
- Limited formability — 1/100, worse than 100% of steel grades
- Limited service temperature — 150°C (302 °F), worse than 99% of steel grades
O2 As-Quenched properties
Typical room-temperature values for O2 As-Quenched; 21 are specific to this condition. Other listed values are O2 reference data and may not represent this condition. Bars are the position among steel grades.
Physical3
O2 As-Quenched has a density of 7.85 g/cm³ (0.284 lb/in³), heavier than 56% of steel grades. It melts at 1,400°C (2,552 °F).
Mechanical15
O2 As-Quenched has a yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,200 MPa (319 ksi) — stronger than 100% of steel grades. Elongation at break is 0.5% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
O2 As-Quenched is rated for continuous service to 150°C (302 °F). It conducts heat at 27 W/m·K (15.6 BTU/hr·ft·°F), worse than 86% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
O2 As-Quenched conducts electricity at 5.7 % IACS, worse than 80% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (10/100), worse than 86% of steel grades.
Sustainability4
Producing a kilogram of O2 As-Quenched takes about 30 MJ of energy and emits 2.3 kg of CO₂ — more than 56% of steel grades. Typical recycled content is 35%.
Manufacturability6
O2 As-Quenched's machinability is not recommended (3/100, worse than 100% of steel grades); weldability not recommended (2/100); formability not recommended (1/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with O2 As-Quenched
Is O2 easy to machine?
Machine only in the annealed state with sharp HSS or coated carbide, moderate speeds and rigid setups; after hardening only grinding or EDM is practical.
Can O2 be welded?
Not recommended for structural joints; repair-weld with matching tool-steel filler at 300–400 °C preheat and temper immediately afterwards.
Can O2 be formed, bent or molded?
Hot work at 900–1050 °C with slow cooling; cold forming is limited — harden from 790–815 °C, oil quench (small sections may be air-cooled) and temper at 150–200 °C for 60–62 HRC, expecting only ~0.02 % size change.
What surface finishes work on O2?
Takes a fine polish for die faces; protect with oil, black oxide, phosphate or thin nitride/PVD coatings since the alloy has essentially no corrosion resistance.
O2 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| C | 0.85 – 0.95 | 0.9 |
| MnDIN 1.2842 / 90MnCrV8 uses Mn 1.80–2.20 | 1.4 – 1.8 | 1.6 |
| Si | 0.1 – 0.5 | 0.25 |
| Cr1.2842: 0.20–0.50 | 0 – 0.5 | 0.3 |
| V1.2842: 0.05–0.20 | 0 – 0.3 | 0.1 |
| Mo | 0 – 0.3 | — |
| W | 0 – 0.3 | — |
| Ni | 0 – 0.3 | — |
| P | 0 – 0.03 | — |
| S | 0 – 0.03 | — |
| Fe | balance | — |
O2 As-Quenched — frequently asked
What is O2 As-Quenched used for?
O2 As-Quenched is typically used for blanking and piercing dies, punches, shear and trim blades, gauges and templates, thread-rolling and knurling tools and woodworking knives. In short: oil-hardening tool steel.
What is the yield strength of O2 As-Quenched?
O2 As-Quenched has a typical yield strength of 2,000 MPa (290 ksi) and a tensile strength of 2,200 MPa (319 ksi) — stronger than 100% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is O2 As-Quenched easy to machine?
Not especially — machinability is rated not recommended (3/100, worse than 100% of steel grades). Machine only in the annealed state with sharp HSS or coated carbide, moderate speeds and rigid setups; after hardening only grinding or EDM is practical.
Can O2 As-Quenched be welded?
Not readily — weldability is rated not recommended (2/100). Not recommended for structural joints; repair-weld with matching tool-steel filler at 300–400 °C preheat and temper immediately afterwards.
What surface finishes work on O2 As-Quenched?
Takes a fine polish for die faces; protect with oil, black oxide, phosphate or thin nitride/PVD coatings since the alloy has essentially no corrosion resistance.
Can O2 As-Quenched be formed, bent or molded?
Hot work at 900–1050 °C with slow cooling; cold forming is limited — harden from 790–815 °C, oil quench (small sections may be air-cooled) and temper at 150–200 °C for 60–62 HRC, expecting only ~0.02 % size change.
What is the maximum service temperature of O2 As-Quenched?
O2 As-Quenched is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in O2 As-Quenched?
Yes — O2 As-Quenched is available for CNC machining; every part is priced by an engineer rather than instantly. Upload a STEP file to get a price and a DFM check.
Sources
- ASTM A681 — Alloy Tool Steels — ASTM International (2015)
- EN ISO 4957 — Tool steels (90MnCrV8 / 1.2842) — CEN/ISO (2018)
- GB/T 1299 (9Mn2V) — SAC (2014)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- 1.2842 / 90MnCrV8 cold-work tool steel datasheet — European tool-steel producers (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.