ASTM B622 / ASME SB-622 / UNS N10276 / W.Nr. 2.4819
ASTM B622 Alloy C276 seamless tubes from Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. are manufactured in Ban Bueng, Chonburi, Thailand, for wet chlorine, hypochlorite and mixed-acid service where stainless steel pits and cracks. The alloy is designated W.Nr. 2.4819 in European standards and is part of our Hastelloy seamless tubes range. Each UNS N10276 seamless tube ships with an EN 10204 3.1 (3.2 on request) material test certificate. Our office is in Bang Phli, Samut Prakan.
Alloy C276 seamless tubeUNS N10276 / W.Nr. 2.4819
EN 10204 3.1 certificate / 3.2 on request
Check your OD, wall and length against our range for ASTM B622 Alloy C276 seamless tubes before you inquire.
ASTM B622 covers both product forms: each ASME SB-622 C276 seamless tube is sized by actual OD and wall, while Alloy C276 seamless pipes are ordered by NPS and schedule from our pipe range.
In a seamless alloy 2.4819 tube, nickel is the balance, alloyed with molybdenum, chromium and tungsten at very low carbon.
Molybdenum resists reducing acids that consume austenitic stainless steel, tungsten raises pitting and crevice resistance in chlorides, and low carbon limits carbide precipitation in the weld heat-affected zone, so the tube keeps its corrosion resistance in the as-welded condition.
Limits per ASTM B622 / ASME SB-622, reported on the mill test certificate for each heat:
UNS N10276C276
| Element | Limit per ASTM B622 / ASME SB-622 (%) |
|---|---|
| Ni (Nickel) | Balance |
| Mo (Molybdenum) | 15.0 to 17.0 |
| Cr (Chromium) | 14.5 to 16.5 |
| Fe (Iron) | 4.0 to 7.0 |
| W (Tungsten) | 3.0 to 4.5 |
| Co (Cobalt) | ≤ 2.5 |
| Mn (Manganese) | ≤ 1.0 |
| V (Vanadium) | ≤ 0.35 |
| Si (Silicon) | ≤ 0.08 |
| P (Phosphorus) | ≤ 0.04 |
| S (Sulfur) | ≤ 0.03 |
| C (Carbon) | ≤ 0.010 |
Each lot of seamless nickel alloy C276 tube is tension tested, and every tube receives a hydrostatic or non-destructive electric test before release.
| Property | Value | Unit |
|---|---|---|
| Tensile Strength, min | 690 (100) | MPa (ksi) |
| Yield Strength (0.2% offset), min | 283 (41) | MPa (ksi) |
| Elongation in 2 in. (50.8 mm) or 4D, min | 40 | % |
Alloy C276 is known by these designations in American, European, Chinese and Japanese standards.
We quote seamless Alloy C276 tube in metric or imperial units within the specification table range, ordered to nominal (average) wall or to minimum wall. Every ASME SB-622 C276 seamless tube is measured against these ASTM B622 cold-worked tolerances before release.
| OD (D) mm | OD Tolerance (mm) | Wall Tolerance, Nominal Wall | Wall Tolerance, Minimum Wall |
|---|---|---|---|
| D ≤ 10 | ±0.10 | ±15% | +30% / 0 |
| 10 < D < 16 | ±0.13 | ±15% | +30% / 0 |
| 16 ≤ D ≤ 38 | ±0.19 | ±10% | +22% / 0 |
| 38 < D ≤ 76 | ±0.25 | ±10% | +22% / 0 |
| 76 < D ≤ 114 | ±0.38 | ±10% | +22% / 0 |
| 114 < D ≤ 152 | ±0.51 | ±12.5% | +28% / 0 |
| 152 < D ≤ 168 | ±0.64 | ±12.5% | +28% / 0 |
| 168 < D ≤ 219 | ±0.79 | ±12.5% | +28% / 0 |
| 219 < D ≤ 356 | +1.57 / -0.79 | +15% / -12.5% | +30% / 0 |
| 356 < D ≤ 610 | +3.18 / -0.79 | +15% / -12.5% | +30% / 0 |
Swipe sideways to see the full table.
On thin-wall tube, with wall 3% of OD or less, the OD tolerance applies to the mean diameter, and single readings including ovality may exceed it by 0.5% of the nominal OD. On tube over 114 mm OD with wall above 3% of OD, the mean diameter is held to the table and single readings may reach twice the table value.
| OD (mm) | Cut Length Tolerance (mm) |
|---|---|
| OD < 50.8 | +3.2 / 0 |
| OD ≥ 50.8 | +4.8 / 0 |
These length tolerances apply to cut lengths up to 7.3 m. Longer cut lengths take an extra +3.2 mm for each 3 m or part of it, up to +12.7 mm more.
Alongside the other grades in our range, we produce seamless Alloy C276 tube as straight lengths, heat exchanger and condenser tubes, U-bends and instrumentation lines.
Thin-wall, close-tolerance tube for shell-and-tube and condenser bundles is a core configuration. Where cooling water is clean and low in chlorides, TP316L is the lower-cost choice; C276 earns its place once hypochlorite or hot chloride brine reaches the shell side.
Each U-tube is bent from one seamless length with no weld in the bend, to the radius and leg-length schedule on your tube layout drawing.
Every seamless alloy 2.4819 tube ships in one of three finishes. Polished (-PL) tube has a maximum Ra of 20 µ-inch (0.5 µm) on the product contact surface and 32 µ-inch (0.8 µm) on the non-product contact surface. Sanitary finish (-SF), better than commercial grade tube finish, suits high-purity hygienic service with mill finish on the non-product contact surface, and mill finish (-PU) applies to both surfaces.
C276 seamless tube is the broadest-spectrum choice of the three, handling oxidizing and reducing media alike. Alloy C22 seamless tubes carry higher chromium and generally perform better in strongly oxidizing media such as nitric acid. Alloy B3 seamless tubes are a chromium-free nickel-molybdenum alloy for hydrochloric and other reducing acids, and are unsuited to oxidizing media.
C276 seamless tube is specified where wet chlorine, hypochlorite, chlorine dioxide, sulfuric and hydrochloric acids or chloride-bearing seawater attack stainless steel.
Acid transfer, reactor internals and process cooling lines in chemical plants run on seamless Alloy C276 tube where mixed-acid streams pit and crack 316L seamless tubes within one turnaround cycle.
In sour oil and gas production, UNS N10276 seamless tube runs chemical injection lines, umbilicals and downhole instrumentation, including high-pressure acid gas injection service.
Condensing acid and chloride concentration at the wet/dry interface defeat stainless steel in scrubber internals, quench and absorber duty, so power and pollution control plants turn to seamless nickel alloy C276 tube.
Seawater cooling, ballast and firewater lines on offshore platforms and coastal plant use Alloy C-276 seamless tube, which performs well in flowing seawater.
Shell-and-tube bundles and condensers handling chlorinated organics, hypochlorite and chlorine dioxide call for C276 seamless tube, since these media attack 304 and 316L stainless steel.
Pharmaceutical reactor, transfer and clean-service lines take polished (-PL) or sanitary (-SF) tubing, where product purity governs the material choice as much as corrosion life does.
Packing
Wooden cases or bundles with plastic end caps; U-bends crated with bend protection.
Marking
Manufacturer name, UNS N10276, ASTM B622, heat number and nominal size on each tube of 3/4 in. (19.0 mm) OD and over and longer than 3 ft (914 mm); smaller or shorter tubes are marked on each piece or on a tag on the bundle or case.
Trade terms
FOB, CIF or CFR.
Documents
EN 10204 3.1 (3.2 on request) material test certificate, raw material certificate, heat treatment charts, third-party inspection report, surface roughness and size measurement report, and a laboratory test certificate from a government-approved lab.
Tests
100% PMI, plus impact, flattening, flare, bend, hardness, intergranular corrosion, pitting corrosion, grain size, eddy current (ET), ultrasonic (UT) and hydrostatic tests on the manufacturer test certificate.
Delivery
From stock or to production schedule, confirmed with the quotation.
Alloy C276 seamless tubes to ASTM B622 are indicatively priced at around USD 25 to 65 per kg. The final price depends on OD, wall thickness, length, finish, quantity and testing, and it follows nickel and molybdenum prices. Send your tube sizes and specification to Thaida for a firm quotation.
Indicative only. Send your sizes and specification to Thaida for a firm quotation.
We manufacture Alloy C276 seamless tubes at our factory at 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand. Our office is at 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand. We supply projects across Thailand and export to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
ASTM B622 applies the cold-worked tolerances in our sizes table. For a 25 mm OD seamless WNR 2.4819 tube, that means ±0.19 mm on OD and ±10% on nominal wall, or +22% / 0 when you order minimum wall. Cut lengths under 50.8 mm OD are held to +3.2 / 0 mm.
Yes. Each U-tube is bent from one seamless length with no weld in the bend, to the bend radius and leg lengths on your bundle drawing, and crated with bend protection. Send the tube layout with OD, wall and radius set for a quotation.
Yes. Wet chlorine, hypochlorite and the acid chloride condensate in flue gas desulfurization scrubbers are core C276 duties, because 15.0 to 17.0% molybdenum and 3.0 to 4.5% tungsten resist the pitting and crevice attack that defeats 316L. Include the chloride level, temperature and pH with your inquiry.
Choose C276 for reducing acids such as sulfuric and hydrochloric acid, where it outperforms C22, and for mixed-duty service that one alloy must cover. C22 carries more chromium and is preferred for strongly oxidizing media, such as nitric acid above 70%. Send your media, concentration and temperature and we will confirm the alloy.
Yes. Drawings that call for "Inconel C276" refer to the same nickel-molybdenum-chromium alloy, UNS N10276, supplied to ASTM B622 / ASME SB-622. Send the drawing with the UNS number and we will quote the matching Alloy C-276 seamless tube.
Order polished (-PL) or sanitary finish (-SF) tube. Polished tube has a maximum Ra of 0.5 µm (20 µ-inch) on the product contact surface and 0.8 µm (32 µ-inch) on the non-product contact surface, while -SF suits high-purity hygienic lines. Mill finish (-PU) applies to both surfaces.
We produce UNS N10276 seamless tube from 6 mm to 457 mm OD, with walls from 1 mm to 65 mm and lengths up to 22 m, quoted in metric or imperial sizes to average or minimum wall.
Each lot ships with an EN 10204 3.1 (3.2 on request) certificate showing heat chemistry against ASTM B622 limits, tension test results and the hydrostatic or non-destructive electric test on every tube. UNS N10276 is stated on every certificate, and W.Nr. 2.4819 is cross-referenced whenever your drawing calls for it.
Request a Quote for Alloy C276 Seamless Tubes
or email sales@thaida.co.th
