ASTM B444 Nickel Chromium Molybdenum Alloy Heat Exchanger Tube
ASTM B444 Nickel Chromium Molybdenum Alloy Tube for Heat Exchanger
This specification covers nickel-chromium-molybdenum columbium alloy (UNS N06625 and UNS N06852)
and nickel-chromium-molybdenum-silicon alloy (UNS N06219) in the form of cold-worked seamless pipe and tube,
The general requirements for pipe and tube are covered by Specification B829
ASTM B444
Referenced ASTM Standard:
E829 Specification for general requirements for Nickel and Nickel alloy seamless pipe and tube.
E112 Test Methods for determining the average grain size.
G28 Test methods for detecting susceptibility to intergranular corrosion in wrought, Nickel-Rich, Chromium-Bearing Alloys.
G48 Test methods for piting and crevice corrosion resistance of stainless steel and related alloys by use of ferric chloride solution.
Keywords: Seamless pipe; seamless tube; N06219; N06625
Chemical Requirements
| Element | Composition Limits, % | ||
| N06852 | N06625 | N06219 | |
| C | 0.05 max | 0.10 max | 0.05 max |
| Mn | 0.50 max | 0.50 max | 0.50 max |
| Si | 0.50 max | 0.50 max | 0.70-1.10 |
| P | 0.015 max | 0.015 max | 0.020 max |
| S | 0.015 max | 0.015 max | 0.010 max |
| Cr | 20.0-23.0 | 20.0-23.0 | 18.0-22.0 |
| Nb+Ta | ... | 3.15-4.15 | ... |
| Nb | 0.51-1.00 | ... | 1.0 max |
| Co (if determined) | ... | 1.0-8.0 | 7.0-9.0 |
| Mo | 8.0-10.0 | 10.0 max | ... |
| Fe | 15.0-20.0 | 5.0 max | 2.0-4.0 |
| Al | 0.40 max | 0.40 max | 0.50 max |
| Ti | 0.40 max | 0.40 max | 0.50 max |
| Cu | ... | ... | 0.50 max |
| Ni | Bal. | 58.0 min | Bal. |
Mechanical Properties:
| Codition | Tensile Strength, min, ksi (MPa) | Yield Strength (0.2% offset), min, ksi (MPa) | Elongation in 2in. or 50.8mm (or 4 D) min, % |
| Alloy N06625 | |||
| Grade 1 (annealed) | 120 (827) | 60 (414) | 30 |
| Grade 2 (solution annealed) | 100 (690) | 40 (276) | 30 |
| Alloy N06219 | |||
| All (solution annealed) | 96 (660) | 39 (270) | 30 |
| Alloy N06852 | |||
| All (solution annealed) | 85 (586) | 35 (241) | 30 |
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