Alloy SteelBar/Rod
Description (English)
Q1: What is Tinel Alloy A? Tinel Alloy A is a nickel-base anti-galling cast alloy with the nominal chemistry Ni balance / Cr 12.5 / Mo 3.0 / Bi 4.0 / Sn 4.0 / Fe 5.0 / Mn 0.8. The bismuth and tin additions form self-lubricating phases in the microstructure, so parts slide repeatedly against other hard metals without liquid lubrication and without galling or seizing. It belongs to the same alloy family as ASTM A494 Grade CY5SnBiM (UNS N26055), commonly traded as Waukesha 88 or Alloy 88.
Size Range
- Diameter Range: 20–250 mm (typical cast bar)
Grade Specification
| System | Value |
|---|---|
| Tinel Alloy A | - |
Chemical Composition
| Element | Value |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 12.5 |
| Iron (Fe) | 5.0 |
| Bismuth (Bi) | 4.0 |
| Tin (Sn) | 4.0 |
| Molybdenum (Mo) | 3.0 |
| Manganese (Mn) | 0.8 |
| Carbon (C) | ≤ 0.05 |
| Silicon (Si) | ≤ 0.5 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.025 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≈ 330–480 MPa (48–70 ksi) |
| Yield Strength | ≈ 260 MPa (38 ksi) |
| Elongation | ≥ 30% (cast condition) |
| Hardness | 121–170 HB (149 HB typical) |
| Elastic Modulus | 186 GPa (27.0 × 10⁶ psi) |
| Galling Performance | Galls at roughly 1/5 the rate of 316 stainless steel |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | - | 8.6 g/cm³ (0.31 lb/in³) |
| Coefficient of Thermal Expansion | - | 8.0 × 10⁻⁶ in/in·°F (0–260°C) — similar to 304 stainless steel |
| Thermal Conductivity | - | Low — 16.7 BTU·in/(hr·ft²·°F) at 105°F, valued in temperature-sensitive areas |
| Electrical Resistivity | - | 112.7 µΩ·cm at 77°F |
| Magnetic Permeability | - | ≈ 10⁻⁴ H/m — essentially non-magnetic |
| Machinability | - | Comparable to 304 stainless steel |
Applications
- Food & Beverage: Rotary lobe and positive displacement pump rotors;Unlubricated bushings, wear rings, pump covers
- Dairy:Components for CIP-cleaned process lines
- Pharmaceutical:Hygienic pump and valve internals
- Valves: Seats, stems and trim requiring anti-seize behaviour
- Polymer Processing:Low-temperature anti-galling screws and dies
- General Industry:Close-tolerance metal-on-metal sliding pairs without lubrication