ASTM B366 C276 BW Equal & Unequal TEE High Corrosion Resistance Hastelloy C276 Butt Weld Pipe Fitting
Brief Introduction
ASTM B366 C276 BW Equal & Unequal Fitting is a high-end corrosion-resistant alloy pipe fitting, strictly manufactured in accordance with ASTM B366 standard, using Hastelloy C276 (UNS N10276) nickel-based alloy as raw material and adopting butt weld (BW) forming process. Hastelloy C276 is a nickel-chromium-molybdenum-tungsten alloy with excellent all-round corrosion resistance, which can resist the erosion of strong acids, strong alkalis, organic solvents, chlorine-containing media and other harsh corrosive environments, and has good high-temperature resistance and mechanical stability. As a key pipeline connection component, it is divided into equal diameter (EQUAL) and unequal diameter (UNEQUAL) two types, specially designed for connecting pipelines of the same or different specifications, changing pipeline direction or distributing medium, with compact structure, firm connection, high pressure-bearing capacity and long service life. It is widely used in high-end industrial fields with harsh working conditions, serving as a reliable and durable connection fitting for pipeline systems conveying strong corrosive and high-temperature media.
Chemical Composition Analysis (wt%)
| Alloy Grade |
Ni |
Cr |
Mo |
W |
Fe |
C |
Si |
P |
S |
| ASTM B366 C276 (UNS N10276) |
Bal. |
14.5-16.5 |
15.0-17.0 |
4.0-7.0 |
4.0-7.0 |
≤0.01 |
≤0.08 |
≤0.04 |
≤0.03 |
Typical Mechanical Properties
| Mechanical Property |
Standard Requirement (ASTM B366) |
Typical Value |
| Yield Strength (Rp0.2), MPa |
≥275 |
280-350 |
| Tensile Strength (Rm), MPa |
≥690 |
700-800 |
| Elongation (A), % |
≥40 |
42-50 |
| Hardness (HB), Brinell |
≤210 |
180-205 |
| Impact Toughness (KV), J (-20℃) |
≥80 |
85-120 |
| Bending Strength, MPa |
≥900 |
920-1050 |
Available Tests
| Test Type |
Standard |
| Chemical Composition Test (PMI) |
Spectrometer, ASTM B366 |
| Tensile & Impact Test |
ASTM E8/E8M, ASTM A370 |
| Hardness Test |
ASTM E10 |
| Hydrostatic/Pneumatic Pressure Test |
ASTM B366, ASME B16.9 |
| Non-Destructive Testing (NDT) |
UT, RT, MT, PT (ASTM E165), Eddy Current Test |
| Corrosion Resistance Test |
ASTM G48 (Pitting), ASTM A262 (Intergranular), Salt Spray Test (ASTM B117) |
| Dimensional & Visual Inspection |
ASTM B366, ASME B16.9, Surface Defect Inspection |
| Microstructure Inspection |
ASTM E45, Metallographic Microscope Test |
| Weld Quality Test |
Weld Penetration Test, Weld Strength Test |
Product Application Scope
| Industry Field |
Typical Applications |
| Petroleum & Petrochemical |
Refinery strong corrosive media pipelines, offshore oil platform pipeline systems, chemical reagent conveying equal/unequal diameter fittings |
| Chemical Industry |
Strong acid/alkali reaction equipment pipelines, organic solvent conveying fittings, chemical reactor connecting equal/unequal diameter components |
| Marine & Coastal Engineering |
Marine corrosion-resistant pipeline systems, desalination plant equal/unequal diameter fittings, coastal harsh environment pipeline connections |
| Nuclear Power Industry |
Nuclear power plant auxiliary system pipelines, radioactive medium conveying fittings, high-temperature high-pressure equal/unequal diameter components |
| Pharmaceutical & Food |
High-purity chemical raw material conveying pipelines, sterile workshop equal/unequal diameter fittings, corrosion-resistant pharmaceutical equipment connections |
| Aerospace & High-Tech |
Aerospace engine pipeline fittings, high-temperature corrosive medium conveying components, precision instrument equal/unequal diameter connections |
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