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ASTM B407 N08811 Nickel-Iron-Chromium Alloy Seamless Tube
ASTM B407 is a specification for nickel-iron-chromium alloy seamless tubes. The specific alloy mentioned, N08811, refers to Incoloy 800H, which is a heat-resistant alloy.
This alloy is valued for its combination of mechanical properties and corrosion resistance, making it suitable for demanding industrial applications where temperature and environmental conditions challenge other materials.
Chemical Composition of UNS N08811
| Composition,% | |
| Grade | N08811 |
| Nicke | 30.0–35.0 |
| Copper | 0.75 |
| Molybdenum | ... |
| Iron | 39.5 min B |
| Manganese | 1.5 |
| Carbon | 0.06–0.10 |
| Silicon | 1.0 |
| Sulfur | 0.015 |
| Chromium | 19.0–23.0 |
| Aluminum | 0.15–0.60 C |
| Titanium | 0.15–0.60 C |
| Phosphorus | ... |
| Cerium | ... |
| Zirconium | ... |
| Yttrium | ... |
| Boron | ... |
| Cobalt | ... |
| Columbium(Nb) | ... |
| Tungsten | ... |
| Nitrogen | ... |
Mechanical Properties Of UNS N08811
| Material and Condition | Tensile Strength, min, ksi (MPa) | Yield Strength (0.2 % Offset), min, ksi (MPa) | Elongation in 2 in.or 50 mm (or4 D)min, % | Rockwell Hardness (or equivalent) for annealed ends A |
| Nickel-iron-chromium alloys:nnealed alloy UNS N08811 | 65 (448) | 25 (172) | 30 | ... |
1. Heat exchangers
2. Chemical processing
3. Power generation
4. Oil and gas industry
5. Aerospace industry
Testings
Chemical Analysis
Mechanical Properties
Grain Size—A transverse sample representing full-wall thickness of annealed alloys UNS N08811 shall conform to an average grain size of ASTM No. 5 or coarser.
Hardness test—When annealed ends are specified for tubing in the stress-relieved condition (see Table 3), the hardness of the ends after annealing shall not exceed the values specified in Table 3.
Flare test—A flare test shall be made on one end of 1 % of the number offinished tube lengths from each lot.
The flare test shall consist of flaring a test specimen with an expanding tool having an included angle of 60° until the specified outside diameter has been increased by 30 %. The flared specimen shall not exhibit cracking through the wall.
Hydrostatic or Nondestructive Electric Test—Each tube shall be subjected to either the hydrostatic test or the nonde-structive electric test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
Hydrostatic Test:
Each tube with an outside diameter 1 ⁄ 8in. (3.2 mm) and larger and tubes with wall thickness of0.015 in. (0.38 mm) and over shall be tested by the manufacturer to an internal hydrostatic pressure of 1000 psi (6.9 MPa) provided that the fiber stress calculated in accordance with the following equation does not exceed the allowable fiber stress, S, indicated below. The tube shall show no evidence of leakage.
