O1 Oil Hardening Tool Steel
Standards: ASTM A681
Shape: Squares, Flats, Blocks, Bars
Size: Round bar 20mm-200mm; Plate 6-150mm
Delivery condition: Annealed,Hardening,Tempering
Steel mill: BAOGANG, FUSHUNSPECIAL STEEL, TIANGONG STEEL
O1 is a type of oil-hardening tool steel for general purpose. It has excellent abrasion resistance and toughness. High manganese content and addition of chromium and tungsten can increase its hardening capacity. It does not require severe water-cooling quenching but oil-cooling quenching, which can make the hardness up to 62HRC. It’s characterized by cheap, small size deformation, but poor toughness and corrosion resistance. AISI O1 steel is mainly used for short run tooling for cold forming dies, blanking dies, and cutting tools operating at ambient temperature.
O1 Equivalent Material
| AISI/SAE | UNS | EN/DIN | JIS | BS | GB |
| O1 | T31501 | 1.2510
100MnCrW4 |
SKS3 | BO1 | 9MnCrWV |
O1 Chemical Composition
| C | Cr | Mn | SI | V | W | Mo |
| 0.85 – 1.00 | 0.40 – 0.70 | 1.00 – 1.40 | 0.10 – 0.50 | 0.30 Max | 0.40 – 0.60 | / |
O1 Mechanical Property
| Density (hardened to 62 HRC) | Melting point | Thermal expansion |
| 7.81 g/cm3 | 1421°C | 10.6 x 10-6/ºC |
O1 Hardness Rockwell C
| As hardened 300°F | 63-64 |
| As hardened 400°F | 61-62 |
| As hardened 500°F | 58-60 |
Wiho metals is a fully stocked and leading AISI O1 steel manufacturer, supplier, exporters, distributors in the forms round bar, flat plate and squares. The tool steel products provide by us shall be fabricated from prime quality raw materials and is fully certifiable to industrial specifications like ASTM, SAE and ASME or other relevant standards. Wiho metals supply and stock a large inventory of oil hardening steel ASTM 681 O1(T31501/ 100MnCrW4/ SKS3/ BO1) bar, plate for tool and die applications. For more information on our extensive steel alloys inventory, please contact us or fill in the form below.
