A Alloy C276 tube, also known as alloy C276 tube, is a high-performance tube made from nickel-molybdenum-chromium alloy with tungsten additions. It is one of the premier grades of Alloy seamless tube.
ASTM B622 Alloy C276 Seamless Tube Manufacturer
We are Zhejiang Xintongda Special Steel (XTD), a reliable manufacturer and supplier of Alloy C276 seamless tubes in China. Our facility produces high-performance nickel alloy tubing products designed for the most aggressive industrial environments. The Alloy C276 seamless tube is a nickel-molybdenum-chromium alloy with tungsten. It consists of a balanced amount of nickel, 15-17% molybdenum, 14.5-16.5% chromium, 3-4.5% tungsten, and the remainder of other elements. Alloy C276’s unique chemical composition makes it very strong and resistant to corrosion. Our tubes comply fully with the ASTM B622 standard.
We can easily meet the needs of large-scale projects because we can handle 25,000 tons a year. Our delivery times are reasonable. We ship stock items within a week, and production orders usually take 15 to 60 days to ship. We are a multiple internationally certified company, and our Alloy C276 seamless nickel tubing is used in many industries, including oil and gas (sour service), chemical processing, pollution control, and more.
Product specifications:
-
Standard
ASTM B622
-
OD Range
6-457 mm
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Thickness
1-65 mm
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Length
≤ 22 m
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Technical Data
Technical Data
Key Steps in Manufacturing Alloy C276 Tube
We transform solid nickel alloy billets into high-precision tubular products through a rigorous process of rotary hot extruded and cold drawing to achieve exact dimensions. To restore the alloy’s corrosion resistance structure after forming, every C276 tube undergoes solution annealing and rapid quenching before final straightening and testing. Please refer to our manufacturing process page.
What are the Features and Advantages of Seamless Alloy C276 Tube?
The Alloy C276 seamless tubes have 5 main features:
- Excellent Corrosion Resistance: Chromium forms a passive layer of chromium oxide to resist oxidation.
- Exceptional Pitting and Crevice Corrosion Resistance: The high molybdenum content (15-17%) provides resistance against pitting and crevice corrosion.
- High Pressure and Temperature Tolerance: The chemical composition, manufacturing process, and mechanical properties contribute to the C276 tube’s high-pressure and temperature tolerance.
- Superior Weldability: The low amount of carbon helps prevent carbide precipitation during welding.
- Resistance to Stress-Corrosion Cracking: This is due to the high amount of nickel.
What is the Pressure Rating of Alloy C276 Tubing?
C276 tube’s working pressure changes as per its dimensions. The table below shows various pressure ratings at room temperature.
| Tube O.D. (in.) |
Wall Thickness of Tube (inches) | |||||||
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (psig) | ||||||||
| 1/8 | 7900 | 10100 | - | - | - | - | - | - |
| 1/4 | 3700 | 4800 | 7000 | 9500 | - | - | - | - |
| 5/16 | - | 3700 | 5400 | 7300 | - | - | - | - |
| 3/8 | - | 3100 | 4400 | 6100 | - | - | - | - |
| 1/2 | - | 2300 | 3200 | 4400 | - | - | - | - |
| 3/4 | - | - | 2200 | 3000 | 4000 | 4600 | - | - |
| 1 | - | - | - | 2200 | 2900 | 3400 | 3900 | 4300 |
Standard Tolerance of ASTM B622 Alloy C276 Tubing
We adhere to strict dimensional tolerances as per the ASTM B622 standard to ensure our Nickel alloy C276 tubing fits your equipment perfectly.
| STANDARD | OD (D) mm |
TOLERANCE (mm) COmmON HIGH |
THICKNESS (S) mm |
TOLERANCE | LENGTH | TOLERANCE |
| B622 (Cold-worked Tube) |
D ≤ 10 | ±0.10 | S(ave): ±15% | S(Min): +30% / 0 |
OD ≤ 50.8: +3.2 / -0 OD ≥ 50.8: +4.8 / -0 Details refer to B829 |
|
| 10 < D ≤ 16 | ±0.13 | |||||
| 16 < D ≤ 38 | ±0.19 | S(ave): ±10% | S(Min): +22% / 0 | |||
| 38 < D ≤ 76 | ±0.25 | S(ave): ±12.5% | S(Min): +28% / 0 | |||
| 76 < D ≤ 114 | ±0.38 | |||||
| 114 < D ≤ 168 | ±0.51 | S(ave): ±15% / -12.5% | S(Min): +30% / 0 | |||
| 168 < D ≤ 219 | ±0.79 | |||||
| 219 < D ≤ 356 | +1.57 / -0.79 | |||||
| 356 < D ≤ 508 | +3.18 / -0.79 | S(ave): ±15% / -12.5% | S(Min): +30% / 0 | |||
What surface finish options are available for Alloy C276 tube?
The surface condition of the tube impacts its resistance to contaminants and flow efficiency. We offer the following finishes for our Alloy C-276 tubing.
| Finish Code | Product Contact Surface (Max Ra)* |
Non-Product Contact Surface (Max Ra) |
| -PL | 20 µ-inch (0.5 µm) | 32 µ-inch (0.8 µm) |
| -SF | Sanitary Finish* | Mill Finish |
| -PU | Mill Finish | Mill Finish |
| *The sanitary finish offering is a finish better than traditional commercial grade tube finish. Suitable for applications in sanitary / high purity hygienic industries. | ||
Maximum Working Pressure Tables of Alloy C276 Seamless Tubes
Maximum Allowable Working Pressure (PSI) For Fractional Sizes
These values represent the safe operating limit for our Alloy C276 seamless tube in fractional inch sizes.
| Tubing OD | Wall Thickness (Inches) | |||||||||||
| .010 | .012 | .016 | .020 | .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| 1/16 | 9,175 | 11,245 | 15,382 | 19,262 | ||||||||
| 1/8 | 9,175 | 13,322 | 16,890 | |||||||||
| 3/16 | 5,830 | 8,480 | 10,900 | 15,722 | ||||||||
| 1/4 | 6,150 | 7,882 | 11,505 | 15,637 | ||||||||
| 3/8 | 5,042 | 7,295 | 10,042 | |||||||||
| 1/2 | 3,707 | 5,317 | 7,255 | 9,570 | ||||||||
| 5/8 | 2,932 | 4,182 | 5,672 | 7,430 | 8,652 | |||||||
| 3/4 | 2,425 | 3,447 | 4,655 | 6,070 | 7,047 | 8,222 | 9,175 | |||||
| 7/8 | 2,065 | 2,932 | 3,950 | 5,132 | 5,945 | 6,917 | 7,702 | |||||
| 1 | 1,800 | 2,550 | 3,427 | 4,445 | 5,140 | 5,970 | 6,637 | |||||
Maximum Allowable Working Pressure (Bar) For Metric Sizes
For clients using metric systems, here is the safe working pressure for standard metric sizes.
| Tubing OD | Wall Thickness (Millimeters) | ||||||||||||
| .5 | .6 | .7 | .8 | 1.0 | 1.2 | 1.5 | 1.6 | 1.8 | 2.0 | 2.2 | 2.5 | 3.0 | |
| 3 | 663 | 811 | 960 | 1107 | 1379 | ||||||||
| 4 | 1915 | 2350 | 2810 | 3245 | 4135 | 4990 | |||||||
| 6 | 1775 | 2060 | 2650 | 3245 | 4135 | 4430 | |||||||
| 8 | 1295 | 1500 | 1915 | 2350 | 3020 | 3245 | |||||||
| 10 | 1180 | 1500 | 1830 | 2350 | 2530 | ||||||||
| 12 | 970 | 1230 | 1500 | 1915 | 2060 | 2350 | 2650 | ||||||
| 14 | 1045 | 1270 | 1615 | 1775 | 1975 | 2225 | 2480 | 2865 | 3500 | ||||
| 16 | 910 | 1100 | 1395 | 1500 | 1705 | 1915 | 2130 | 2465 | 3020 | ||||
| 18 | 800 | 970 | 1230 | 1320 | 1500 | 1680 | 1870 | 2155 | 2650 | ||||
| 22 | 650 | 790 | 995 | 1065 | 1210 | 1350 | 1540 | 1725 | 2110 | ||||
| 25 | 570 | 690 | 870 | 930 | 1050 | 1180 | 1305 | 1500 | 1830 | ||||
Bursting Pressure Tables of Alloy C276 Seamless Tube
Calculated Burst Pressure (PSI) For Fractional Sizes
Burst pressure indicates the theoretical point of failure, which is significantly higher than working pressure.
| Tubing OD | Wall Thickness (Inches) | |||||||||||
| .010 | .012 | .016 | .020 | .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| 1/16 | 36,700 | 44,980 | 61,528 | 77,048 | ||||||||
| 1/8 | 36,700 | 53,290 | 67,560 | |||||||||
| 3/16 | 23,320 | 33,920 | 43,600 | 62,890 | ||||||||
| 1/4 | 24,600 | 31,530 | 46,020 | 62,550 | ||||||||
| 3/8 | 20,170 | 29,180 | 40,170 | |||||||||
| 1/2 | 14,830 | 21,270 | 29,020 | 38,280 | ||||||||
| 5/8 | 11,730 | 16,730 | 22,690 | 29,720 | 34,610 | |||||||
| 3/4 | 9,700 | 13,790 | 18,620 | 24,280 | 28,190 | 32,900 | 36,700 | |||||
| 7/8 | 8,260 | 11,730 | 15,800 | 20,530 | 23,780 | 27,670 | 30,810 | |||||
| 1 | 7,200 | 10,200 | 13,710 | 17,780 | 20,560 | 23,880 | 26,550 | |||||
Calculated Burst Pressure (Bar) For Metric Sizes
The calculated burst pressure for metric Alloy C276 seamless nickel tubing is outlined below.
| Tubing OD | Wall Thickness (Inches) | ||||||||||||
| .5 | .6 | .7 | .8 | 1.0 | 1.2 | 1.5 | 1.6 | 1.8 | 2.0 | 2.2 | 2.5 | 3.0 | |
| 3 | 2650 | 3245 | 3840 | 4430 | 5515 | ||||||||
| 4 | 1915 | 2350 | 2810 | 3245 | 4135 | 4990 | |||||||
| 6 | 1775 | 2060 | 2650 | 3245 | 4135 | 4430 | |||||||
| 8 | 1295 | 1500 | 1915 | 2350 | 3020 | 3245 | |||||||
| 10 | 1180 | 1500 | 1830 | 2350 | 2530 | ||||||||
| 12 | 970 | 1230 | 1500 | 1915 | 2060 | 2350 | 2650 | ||||||
| 14 | 1045 | 1270 | 1615 | 1775 | 1975 | 2225 | 2480 | 2865 | 3500 | ||||
| 16 | 910 | 1100 | 1395 | 1500 | 1705 | 1915 | 2130 | 2465 | 3020 | ||||
| 18 | 800 | 970 | 1230 | 1320 | 1500 | 1680 | 1870 | 2155 | 2650 | ||||
| 22 | 650 | 790 | 995 | 1065 | 1210 | 1350 | 1540 | 1725 | 2110 | ||||
| 25 | 570 | 690 | 870 | 930 | 1050 | 1180 | 1305 | 1500 | 1830 | ||||
What is the equivalent standard for Alloy C276?
The C276 tube is also known through various international designations. The main equivalent is UNS N10276, but it can also be referred to against European standards as DIN 2.4819.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Alloy 276/C276 | N10276 | H10276 | NS3304 | - | - | 2.4819 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
What industries commonly use Alloy C276 tubing?
The Industries of UNS N10276 tube are vast because it performs where stainless steel cracks or dissolves.
Chemical Processing
Used extensively in heat exchangers, reaction vessels, evaporators, and transfer piping that handle wet chlorine, hypochlorite, and chlorine dioxide.
Pharmaceutical Industry
The alloy is chosen for reactor vessels, drug delivery systems, and tubing where maintaining product purity is critical, and contamination from corrosion is unacceptable.
Pollution Control
Alloy C276 seamless tubes can be found in Flue Gas Desulfurization (FGD) systems, specifically in dampers, stack liners, and scrubbers that manage corrosive sulfur gases.
Waste Treatment
Useful for evaporation systems, wastewater treatments, incineration facilities, and injection wells to treat toxic industrial and municipal waste.
Pulp & Paper Production
Used in digesters, heat exchangers, and bleaching stages where harsh chemicals are required to whiten paper pulp.
Frequently Asked Questions
-
What is an Alloy C276 tube?
- Key Steps in Manufacturing Alloy C276 Tube
- What are the Features and Advantages of Seamless Alloy C276 Tube?
- What is the Pressure Rating of Alloy C276 Tubing?
- Standard Tolerance of ASTM B622 Alloy C276 Tubing
- What surface finish options are available for Alloy C276 tube?
- Maximum Working Pressure Tables of Alloy C276 Seamless Tubes
- Bursting Pressure Tables of Alloy C276 Seamless Tube
- What is the equivalent standard for Alloy C276?
- 100% Certified Testing & Documentation
- What industries commonly use Alloy C276 tubing?
- Frequently Asked Questions