概述
Waukesha Metal 88 (WM88), commonly known as Alloy 88, is a proprietary nickel-based casting alloy invented by Waukesha Foundry in 1954 (Patent US5242657A). It is engineered specifically to prevent galling and seizing during metal-on-metal contact without requiring liquid lubricants — making it the material of choice for food, beverage, dairy, and pharmaceutical equipment where lubricants are prohibited. The alloy's unique microstructure incorporates bismuth and tin as solid lubrication phases, while chromium and molybdenum provide superior corrosion resistance against cleaning agents, acids, and sterilization chemicals. WM88 is FDA-approved and meets 3-A sanitary standards for food contact surfaces. WM88 machines similarly to 304 stainless steel and is compatible with stainless steels, Inconel, Monel, and chromium-plated parts. It offers approximately 5× better galling resistance than 316 stainless steel and maintains close operating clearances in moving parts. Available as solid round bar stock in 11 standard sizes from 0.75" to 3.00" diameter, with custom sizes and near-net-shape castings available upon request.
尺寸范围
- Minimum Diameter 0.75" (19.05 mm)
- Maximum Diameter 3.00" (76.20 mm)
- Standard Lengths 6" (152.4 mm) and 12" (304.8 mm)
- Extended Length Available 15" (381.0 mm) — for 1.25" diameter
- Product Form Solid Round Bar (cast and machined)
- Tolerance Standard cast bar tolerances; machinable to close clearance
- Custom Sizes Available upon request — any diameter beyond standard range
- Near-Net-Shape Castings Available for high-volume or complex geometry requirements
牌号标准
| 标准体系 | 数值 |
|---|---|
| 🇺🇸 ASTM | CY5SnBiM |
| 🇺🇸 UNS | N26055 |
| DIN / EN | 2.4712 |
化学成分
| 元素 | 数值 |
|---|---|
| Ni | Balance |
| Cr | 11-14 |
| Mo | 2-3.5 |
| Bi | 3-5 |
| Sn | 3-5 |
| Fe | 2.0 max |
| Mn | 1.0 max |
| Si | 0.50 max |
| C | 0.05 max |
| P | 0.03 max |
| S | 0.03 max |
机械性能
| 性能 | 数值 |
|---|---|
| Tensile Strength (Rm), min | 300 MPa |
| Yield Strength (Rp0.2), min | 220 MPa |
| Elongation (A), min | 5% |
| Flexural Modulus (Young's) | 185 GPa |
物理性能
| 性能 | 单位 | 数值 |
|---|---|---|
| Hardness | - | 121–170 BHN (149 typical) |
| Density | - | 0.31 lb/in³ (room temperature) |
| Coefficient of Thermal Expansion | - | 8.0 × 10⁻⁶ in/in/°F (0–500°F) |
| Magnetic Permeability | - | ~10⁻⁴ H/m |
| Max Operating Temperature | - | 500°F (260°C) |
| Galling Resistance | - | ~5× better than 316 stainless steel |
| Thermal Conductivity | - | Low |
| Machinability | - | Similar to 304 stainless steel |
应用场景
- Food & Beverage Processing
- Dairy Industry
- Pharmaceutical
- Chemical Processing
- General Industrial