Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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ASME B16.5 Hastelloy C276 Flange ASTM B462 UNS N10276 / 2.4819 Nickel Alloy WNRF Flange
Hastelloy C276 (UNS N10276/ 2.4819) is a nickel-chromium-molybdenum-tungsten superalloy renowned for exceptional corrosion resistance in extreme environments. Key features:
Composition: 57% Ni, 15–17% Mo, 14.5–16.5% Cr, 3–4.5% W, and ultra-low carbon (≤0.01%) to prevent carbide precipitation during welding.
Corrosion Resistance: Withstands pitting, crevice corrosion, and stress corrosion cracking (SCC) in oxidizing/reducing media, including sulfuric, hydrochloric, and phosphoric acids, chlorides, and sour (H₂S) environments. Its PREn (Pitting Resistance Equivalent) of ~69 outperforms most stainless steels.
Temperature Range: Retains strength and oxidation resistance up to 1,040°C (1,900°F), though prolonged exposure above 540°C risks carbide formation.
Testing/Certification: Complies with NACE MR0175 for sour service and ASTM B462 for wrought components. PT/RT testing is critical for high-integrity welds.
Hidden Strengths: Tungsten enhances stability in mixed acids, while electropolishing mitigates post-weld corrosion. Avoids gamma prime phase embrittlement, unlike age-hardenable alloys.
Equivalent Grades of ASTM B462 Hastelloy C276 Flange Nickel Alloy UNS N10276 Weld Neck Flange
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | OR | GOST |
| Hastelloy C276 | N10276 | 2.4819 | - | NiMo16Cr15W | NW 0276 | ЭП760 | ХН65МВУ |
Chemical Composition of of ASTM B462 Hastelloy C276 Flange Nickel Alloy UNS N10276 Weld Neck Flange
| Hastelloy C276 | Ni | C | Mo | Mn | Si | Fe | P | S | Co | Cr |
| Balance | 0.010 max | 15.00 – 17.00 | 1.00 max | 0.08 max | 4.00 – 7.00 | 0.04 max | 0.03 max | 2.5 max | 14.50 – 16.50 |
Mechanical properties (Minimum value at 20℃) of Hastelloy C276 Flange Nickel Alloy UNS N10276 Weld Neck Flange
| Tensile Strengthσb/MPa | Yield Strengthσp0.2/MPa | Elongationσ5 /% |
| 690 | 283 | 40 |
UNS N10276 / Hastelloy C276 Flange Type
WN brida forjada, bridas de cuello de soldadura – WNRF
-N10276 Welding Neck Flange(WNF) & Long Welding Neck Flange(LWNF)
-N10276 Slip-on Flange(SOF)
-Lap Joint Flange(LJW)
-N10276 bind Flange
-Socket Welding Flange (SWF)
-Threaded Flange(THW)
-Plate Flange
ASTM/ASME/ANSIB16.5, B16.47, ASME/ANSI B16.48 flange
slip on flange, Weld Neck Flange ,Threaded Flange Blind Flange
Application
Chemical Processing: Reactors, heat exchangers, and piping in HCl, H₂SO₄, and acetic acid environments.
Oil & Gas: Subsea pipelines, downhole tools, and sour gas handling.
Pollution Control: Flue gas desulfurization (FGD) systems.
Pharmaceutical: High-purity systems requiring contamination resistance.
Marine: Seawater cooling systems and offshore platforms.
