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O1
Qilu
Product Description
Hot forged O1 round bar and flats, supplied annealed for machining, with heat treatment and ultrasonic testing done in our own workshop.
Equivalent to: AISI O1 · DIN 1.2510 / 100MnCrW4 · JIS SKS3 · 9CrWMn
ASTM O1 SKS3 1.2510 100MnCrW4 9CrWMn Cold Work Tool Steel
ASTM O1 SKS3 1.2510 100MnCrW4 9CrWMn Cold Work Tool Steel
ASTM O1 SKS3 1.2510 100MnCrW4 9CrWMn Cold Work Tool Steel
Supply form — Round bar, flats and plates
Process — Hot forged / hot rolled
Condition — Annealed (≤ 229 HB), hardened to 58-62 HRC
Diameter range — 10-300 mm
Standard — ASTM A681
Certificate — EN 10204 3.1 standard, 3.2 on request
Lead time — 15-30 days
O1 is the oil-hardening low-alloy cold-work tool steel from ASTM A681. With ~1 % carbon, manganese, chromium and a small tungsten addition, it hardens cleanly in oil and machines beautifully in the annealed condition — the standard grade for gauges, jig and fixture parts, and blanking and forming dies where toughness matters more than maximum wear resistance.
| Element | C | Mn | Si | Cr | W |
|---|---|---|---|---|---|
| ASTM A681 O1 | 0.85-1.05 | 1.00-1.40 | 0.10-0.50 | 0.40-1.20 | 0.40-0.60 |
Typical values. O1 is the most machinable of the cold-work wear grades.
| Property | Annealed | Hardened (typical) |
|---|---|---|
| Hardness | ≤ 229 HB | 58-62 HRC |
| Tensile strength, Rm (MPa) | — | ≈ 1700 |
| Impact, KV (J) | — | ≥ 22 |
| Machinability | — | Excellent (annealed) |
| Standard | Designation |
|---|---|
| ASTM (USA) | O1 |
| DIN / EN (Germany/Europe) | 1.2510 / 100MnCrW4 |
| JIS (Japan) | SKS3 |
| GB (China) | 9CrWMn (close) |
| Werkstoff Nr. | 1.2510 |
Tooling — gauges, jigs, fixtures, precision tooling
Cutting — blanking, piercing and trimming dies
Forming — drawing and forming dies
Plastics — mold cavities and insert pins
O1 is hardened from 780-820 °C in oil and tempered at 150-200 °C. Oil quench gives full hardness with reasonable distortion control. It is the most forgiving of the cold-work grades to heat-treat and machine, which is why it is the default for general toolroom work.
Most suppliers in this business are traders who subcontract everything. We run our own processes, which means shorter cycles and one point of accountability when something needs fixing.
Heat treatment shop — quenching, tempering and vacuum heat treatment to your target hardness, with furnace charts recorded per batch
Machining shop — rough turning, peeling, milling and cutting to length, so your bar or block arrives ready for finish machining
Testing — ultrasonic per ASTM A388 / EN 10228-3, hardness mapping across the section, microstructure on request
Certification — EN 10204 3.1 as standard, 3.2 available with third-party witness (ABS, BV, CCS, GL)
Export packing — bundled, end-capped and rust-protected for sea freight
O1 is a low-alloy oil-hardening grade — tougher and easier to machine, but with lower wear resistance. D2 is a high-Cr air-hardening grade — harder and more wear-resistant, but more brittle. O1 for general toolroom; D2 for long-run production. See our D2 page.
Yes. We heat treat to 58-62 HRC, rough-machine to size and ultrasonically test.
EN 10204 3.1 mill certificate as standard. 3.2 with third-party witness on request.
Send us your grade, dimensions, quantity, required hardness and destination port. You will get a quotation with the full technical proposal within 24 hours.
Email: enquiry@qilumetal.com | Web: www.qilumetal.com
