コバルト合金6B
Cobalt Alloy 6B is a cobalt-based chromium-tungsten alloy. Unlike most wear-resistant materials which are cast and brittle, Alloy 6B is wrought (hot worked). This imparts excellent toughness and shock resistance while maintaining high resistance to seizure, galling, and abrasion.
- 一般的なフォーム： Plate, Sheet, Flat Bar, Round Bar.
- 主な特徴 Anti-galling & wear resistance with high toughness.
- 比較する： Superior shock resistance compared to Cast Stellite 6.
- Properties: Non-magnetic; low coefficient of friction.
Alloy 6B solves a specific engineering problem: How to prevent wear in parts subjected to impact or shock? Hard-facing and cast alloys often crack under these conditions. Alloy 6B's wrought structure allows it to absorb impact without shattering, while its complex carbide network prevents erosion and metal-to-metal seizing, even without lubrication.
Abrasion & Erosion
Excellent resistance to cavitation, slurry erosion, and sliding wear. It keeps a sharp edge longer than steel or titanium.
Anti-Galling
Exceptionally low coefficient of friction. It resists seizing and galling when sliding against other metals, even without lubricants.
Toughness
Because it is hot-worked, it has ductility and impact strength far superior to cast cobalt alloys or ceramics.
| エレメント | コンテンツ（%） |
|---|---|
| コバルト | Balance (approx 58%) |
| クロム（Cr） | 28.0 - 32.0 |
| タングステン（W） | 3.5 - 5.5 |
| ニッケル（Ni） | 最大3.0 |
| 鉄（Fe） | 最大3.0 |
| カーボン（C） | 0.9 - 1.4 |
| モリブデン (Mo) | 1.5 max |
*Note: The high Carbon and Chromium content forms hard carbides within the tough cobalt matrix.
| 製品形態 | Standards (AMS / ASTM) |
|---|---|
| Bar, Forgings, Sheet, Plate | AMS 5894 |
| Testing | ASTM E8 (Tensile), ASTM E23 (Impact) |
| プロパティ | 代表値（室温） |
|---|---|
| 引張強度 | 145 ksi (1000 MPa) |
| 降伏強さ（0.2%オフセット） | 90 ksi (620 MPa) |
| 伸び | 11 - 13 % |
| 硬度（ロックウェルC） | 33 - 43 HRC (Typical 36-38) |
| Modulus of Elasticity | 33.5 x 10⁶ psi |
*Note: Hardness is retained well at elevated temperatures (Red Hardness).
Erosion Shields
Steam turbine leading edges (erosion shields) protecting blades from water droplet erosion.
Industrial Cutting
Saw blades, scraper blades, and knives for cutting rubber, textiles, and food products.
Bearings & Bushings
Sleeve bearings, bushings, and wear pads in high-temperature or corrosive environments.
バルブ部品
Valve balls, seats, and stems requiring resistance to steam erosion and high-pressure fluids.
Need Cobalt Alloy 6B Plate or Bar?
We stock Cobalt Alloy 6B (AMS 5894) in sheet, plate, and flat bar. We also offer waterjet cutting to your specific dimensions.
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