The chemistry of 201 Nickel hot finish tubing is similar to nickel alloy 200. However, the small difference noted between the two alloys in the content of carbon. In comparison to alloy 200, the content of carbon in Nickel 201 Tube is about a max of 0.02%.
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Low carbon alloys, especially like this one have good tolerance to heat and can be used beyond temperatures of 600° F. Its resistance to get embrittled at very high temperatures are considered to be a deal breaker by many industries. Since ASME SB161 Nickel Alloy 201 welded tubing does not get embrittled by intergranular precipitates and is able to resist graphitization at a temperature ranging between 600° F to 1400° F, they are used in many processes. Unlike its predecessor alloy 200, the properties of ASTM B161 werkstoff nr.2.4068 cold drawn tube will not get compromised even if the alloy is used in applications up to 1230° F.
The ASTM B725 specified Nickel NW 2201 material caters to welded pipes, which are produced from flat rolled alloys using an automatic welding process. The welding carried out on this material is to be performed without any filler metal added.
The ASTM B725 Alloy 201 ERW Tubes, according to the specification are to be cold worked after undergoing a welding operation. Cold working nickel 201 ensures that the alloy gets optimised resistance to corrosion, not only in the area that has been welded but also in the base metal during the final heat treatment. Applications where UNS N02201 annealed tube can be used include chemical processing and storage along with the production of synthetic fibre. Additionally, the Alloy 201 Seamless Tubing can be used in processes involving sodium hydroxide and fluorine.
| Specifications | ASTM B161, B725 / ASME SB161, B725 |
| Dimensions | ASTM, ASME and API |
| Alloy 201 Tubes Size |
6 mm OD x 0.7 mm to 50.8 mm OD x 3 mm thk. |
| Schedule | STD, SCH80, XXS, XS, SCH20, SCH140, SCH30, SCH160, SCH60, SCH80, SCH120, SCH40 |
| Type | ERW / Seamless/ Fabricated /LSAW /Welded Tubes |
| Form | Rectangular, Round, Square, Hydraulic etc |
| Length | Single Random, Double Random & Cut Length. |
| End | Beveled End, Plain End, Threaded |
ASME SB161 UNS N02201 welded tubing
Alloy 201 Square tube
ASTM B161 Alloy 201 cold drawn tube
DIN 2.4068 annealed tube
Alloy 201 ERW Tubes
nickel alloy 201 tubing
Alloy 201 hot finish tubing
Alloy NW 2201 material
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 201 | 8.9 g/cm3 | 1446 °C (2635 °F) | Psi – 67000 , MPa – 462 | Psi – 21500 , MPa – 148 | 45 % |
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| 201 | 0.15 max | 0.35 max | 0.35 max | 0.01 max | 0.25 max | 0.40 max | 99.0 min | – |
| STANDARD | WNR Material Number | UNS | JIS | BS | GOST | AFNOR | EN |
| 201 | 2.4068 | N02201 | NW 2201 | NA 12 | НП-2 | – | LC-Ni 99 |
The nickel alloy 201 is one of the commercially pure nickel grades with 99% nickel in the composition. The material is annealed for strength at temperatures between 1300 and 1600 °F. The hardness of the material is expressed in brinell numbers. The hot finished, hot finished and annealed materials have 75-100 Brinell, the cold drawn ones have 125-200 Brinell and the cold drawn and annealed materials have 75-100 Brinnel. The material is used in chemical processing, aerospace, missile components and in applications where sodium hydroxide and fluorine are present. The other variations such as the alloy 200 and 205 can also be interchangeably used.