Steel O2 Cold Drawn
Supply condition
AISI/SAE O2 · UNS T31502 · EN 1.2842, 90MnCrV8 · GB 9Mn2V
Annealed material supplied to close size and finish so only the working faces need machining.
Values for the Cold Drawn 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 | — |
Cold DrawnThis page 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 | — |
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 Cold Drawn?
O2 Cold Drawn is O2 supplied in the Cold Drawn condition — annealed material supplied to close size and finish so only the working faces need machining. O2 Cold Drawn has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 67% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi). O2 Cold Drawn 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; Cold Drawn is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 70/100, better than 87% of steel grades
Limitations
- Limited service temperature — 200°C (392 °F), worse than 93% of steel grades
- Difficult to weld — 15/100, worse than 91% of steel grades
- Poor heat conductor — 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades
O2 Cold Drawn properties
Typical room-temperature values for O2 Cold Drawn; 23 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 Cold Drawn 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 Cold Drawn has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 67% of steel grades. Elongation at break is 15% and the elastic modulus is 210 GPa (30.5 Msi).
Thermal6
O2 Cold Drawn is rated for continuous service to 200°C (392 °F). It conducts heat at 33 W/m·K (19.1 BTU/hr·ft·°F), worse than 80% of steel grades. Thermal expansion is 12.5 µm/m·K (6.94 µin/in·°F).
Electrical3
O2 Cold Drawn conducts electricity at 8 % IACS, better than 55% of steel grades.
Chemical & Environmental3
Corrosion resistance is not recommended (12/100), worse than 53% of steel grades.
Sustainability4
Producing a kilogram of O2 Cold Drawn 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 Cold Drawn's machinability is fair (46/100, worse than 59% of steel grades); weldability poor (15/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with O2 Cold Drawn
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 Cold Drawn — frequently asked
What is O2 Cold Drawn used for?
O2 Cold Drawn 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 Cold Drawn?
O2 Cold Drawn has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 800 MPa (116 ksi) — stronger than 67% of steel grades. Strength varies by condition: see the 5 listed tempers.
Is O2 Cold Drawn easy to machine?
Reasonably — machinability is rated fair (46/100, worse than 59% 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 Cold Drawn be welded?
Not readily — weldability is rated poor (15/100). 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 Cold Drawn?
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 Cold Drawn 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 Cold Drawn?
O2 Cold Drawn is rated for continuous use to about 200°C (392 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Can FabDigit make parts in O2 Cold Drawn?
Yes — O2 Cold Drawn 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.