ASTM B161 specifies the requirements for seamless nickel and nickel alloy condenser and heat exchanger tubes. These tubes are commonly used in various industrial applications where corrosion resistance and high-temperature performance are crucial. The standard covers seamless tubes made from nickel and nickel alloys, ensuring they meet the necessary chemical composition, mechanical properties, dimensions, and other relevant specifications for their intended use.
Mechanical Properties
Chemical Requirements
| Element | Nickel (UNS N02200) | Low-Carbon Nickel (UNS N02201) |
|---|---|---|
| Ni (min) | 99.0 | 99.0 |
| Cu (max) | 0.25 | 0.25 |
| Fe (max) | 0.40 | 0.40 |
| Mn (max) | 0.35 | 0.35 |
| C (max)† | 0.15 | 0.02 |
| Si (max) | 0.35 | 0.35 |
| S (max) | 0.01 | 0.01 |
A Element shall be determined arithmetically by difference. †Corrected editorially.
Mechanical PropertiesA of Small-Diameter and Light-Wall Tubing (Converter Sizes)
| Condition | Tensile Strength, psi (MPa) | Yield Strength (0.2% offset), min, psi (MPa) | Elongation in 2 in. or 50 mm, min, % |
|---|---|---|---|
| Nickel UNS N02200 | |||
| Annealed | 75,000 (515) max | 15,000 (105) | 33 |
| Half-hard | 80,000 (550) min | 40,000 (275) | 12 |
| Full hard | 95,000 (655) min | 75,000 (515) | 4 |
| Low-Carbon Nickel UNS N02201 | |||
| Annealed | 70,000 (480) max | 12,000 (85) | 35 |
| Half-hard | 70,000 (480) min | 30,000 (205) | 12 |
| Full hard | 85,000 (585) min | 65,000 (450) | 4 |
Note: Not applicable to outside diameters under 1⁄8 in. (3.2 mm) and wall thicknesses under 0.015 in. (0.38 mm). The conditions are sometimes designated as "No. 1 Temper" (Annealed), "No. 2 Temper" (Half-hard), and "No. 3 Temper" (Full hard).
