ASTM B462 C276 WN RF Flange, Hastelloy C276 Weld Neck Raised Face Forged Flange
Brief Introduction
ASTM B462 C276 WN RF Flange is a high-end corrosion-resistant nickel-based superalloy forged flange, strictly manufactured in accordance with ASTM B462 (material standard for Hastelloy C276 forgings) and ASME B16.5 (dimensional standard). C276 (commonly known as Hastelloy C276) is a premium nickel-chromium-molybdenum-tungsten alloy, famous for its exceptional resistance to almost all strong corrosive media (including sulfuric acid, hydrochloric acid, phosphoric acid, chloride solutions, and seawater). As a Weld Neck (WN) flange with Raised Face (RF), it features high structural strength, reliable sealing performance, and strong connection stability, specially designed for high-temperature, high-pressure, and harsh corrosive industrial piping systems, widely applied in petrochemical, marine engineering, chemical processing, and other critical fields.
Chemical Composition Analysis (wt%)
| Alloy Grade |
Ni |
Cr |
Mo |
W |
Fe |
C |
Si |
Mn |
P |
S |
| ASTM B462 C276 (Hastelloy C276) |
57.0 Min. |
14.5-16.5 |
15.0-17.0 |
3.0-4.5 |
4.0-7.0 |
≤0.010 |
≤0.08 |
≤1.00 |
≤0.040 |
≤0.030 |
Typical Mechanical Properties
| Mechanical Property |
Standard Requirement (Min.) |
Typical Value (Solution Annealed) |
| Yield Strength (Rp0.2), MPa |
≥275 |
300-400 |
| Tensile Strength (Rm), MPa |
≥690 |
700-850 |
| Elongation (A), % |
≥40 |
45-55 |
| Hardness (HB), Brinell |
≤210 |
170-200 |
| Impact Toughness (KV), J (20℃) |
≥100 |
120-180 |
| Max. Working Temperature |
1093℃ (Long-term) |
1093℃ |
Available Tests
| Test Type |
Standard |
| Chemical Composition Analysis (PMI) |
Spectrometer (XRF/OES), ASTM E1019 |
| Tensile & Impact Test |
ASTM E8/E8M, ASTM A370, Charpy V-Notch |
| Hardness Test |
ASTM E10 (Brinell), ASTM E18 (Rockwell), Vickers |
| Solution Annealing Inspection |
ASTM B462, Metallographic Microstructure Test |
| Corrosion Resistance Test |
ASTM G48 (Pitting/Crevice), ASTM B117 (Salt Spray), ASTM A262, ASTM G31 (Immersion Test) |
| Non-Destructive Testing (NDT) |
UT (Ultrasonic), MT (Magnetic Particle), PT (Liquid Penetrant) |
| Hydrostatic/Pneumatic Pressure Test |
ASTM B462, ASME B16.5 |
| Dimensional & Visual Inspection |
ASTM B462, ASME B16.5, CMM, Gauge Inspection |
| Material Test Certificate (MTC) |
EN 10204 3.1/3.2, ASTM B462 |
Product Application Scope
| Industry Field |
Typical Applications |
| Petrochemical & Refinery |
Corrosive process pipelines, hydrogenation reaction equipment, refinery acid-base pipeline connections, sulfur recovery systems, catalyst system flanges |
| Chemical Processing |
Acid-base production pipelines, chemical reaction vessels, pharmaceutical equipment connections, organic synthesis equipment flanges |
| Marine Engineering |
Offshore platform corrosion-resistant pipelines, seawater cooling systems, marine engine pipeline connections, coastal industrial piping flanges |
| Seawater Desalination |
Desalination plant pipelines, reverse osmosis system flanges, brine treatment equipment, seawater intake and discharge pipeline connections |
| Nuclear Power Industry |
Nuclear reactor auxiliary system flanges, radioactive material handling equipment, high-temperature and high-pressure corrosion-resistant pipelines |
| Other High-Corrosion Fields |
Wastewater treatment equipment, acid storage and transportation systems, high-temperature furnace flanges, electronic chemical equipment connections |
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