ASTM B564 Inconel 625 UNS N06625 Blind Flanges RTJ ASME B16.5 API 6A
ASTM B564 Inconel 625 UNS N06625 blind flanges are nickel-chromium-molybdenum alloy forged flanges designed to close the end of piping systems, valves, or pressure vessels operating under high pressure, high temperature, and severe corrosive conditions. Manufactured in accordance with ASTM B564 / ASME SB564, Inconel 625 blind flanges offer exceptional resistance to pitting, crevice corrosion, oxidation, and chloride stress corrosion cracking.
We are the manufacturer of ASTM B564 Inconel 625 UNS N06625 Blind Flanges RTJ ASME B16.5 API 6A in China.
What is Inconel 625 ?
Alloy 625,Inconel 625 also known as UNS N06625 is a nickel-chromium-molybdenum alloy that is used for its high strength, high toughness and excellent corrosion resistance. The strength of alloy 625,UNS N06625 is derived from the stiffening effect of molybdenum and niobium on its nickel-chromium matrix. Although the alloy was developed for high temperature strength, its highly alloyed composition also provides a significant level of general corrosion resistance.
Inconel 625, Alloy 625 is a low carbon (0.03%) nickel-chromium-molybdenum-niobium alloy which has excellent corrosion resistance to a wide range of corrosive media. Alloy 625 is normally supplied in annealed condition for wet corrosion applications and is TÜV-approved for pressure vessels in the temperature range from -196°C to 450°C. In annealed condition (grade 1) Alloy 625 is characterized by:
About the Inconel 625 blind flange
Inconel 625 Blind flanges may be used when testing pipe pressure, to create an access point in a piping system, to temporarily seal a piping system while modifying or repairing the line, or to create a long-term seal to terminate a piping system. A blind flange is bolted, rather than welded in place.
Inconel 625 blind flange is used in a variety of industries, including automotive, marine, aerospace, oil and gas, chemical processing and nuclear. Typical end use applications include heat exchangers, bellows, expansion joints, exhaust systems, fasteners, quick connect fittings and many other applications requiring strength and resistance against aggressive corrosive environments.

ASTM B564 Inconel 625
ASTM B 564 This specification covers forgings of nickel alloy UNS N02200, Ni-Cu alloy UNS N04400, Ni-Cr-Fe alloys UNS N06600, UNS N06603, and UNS N06690, Ni-Cr-Mo-Nb alloy UNS N06625 etc
INCONEL 625 FLANGES,Alloy 625,UNS N06625 EQUIVALENT GRADE
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN | OR |
| Inconel 625 | 2.4856 | N06625 | NCF 625 | NA 21 | ХН75МБТЮ | NC22DNB4M | NiCr22Mo9Nb | ЭИ602 |
INCONEL 625 FLANGES CHEMICAL COMPOSITION
| Grade | C | Mn | Si | P | S | Ni | Cr | Fe | Mo | Co | Al | Ti | Nb + Ta |
| Inconel 625 | 0.10 max | 0.50 max | 0.50 max | 0.015 max | 0.015 max | 58.0 min | 20.0 – 23.0 | 5.0 max | 8.0 – 10.0 | 1.0 max | 0.40 max | 0.40 max | 3.15 – 4.15 |
ALLOY 625 flange ,inconel 625 FLANGES MECHANICAL PROPERTIES
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.94 g/cm3 | 1385 °C (2525 °F) | Psi – 75,000 , MPa – 520 | Psi – 30,000 , MPa –205 | 30 % |
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Heat Treatment
ASTM B564 Inconel 625 blind flanges are typically supplied in solution annealed condition. Alloy 625 derives its high strength primarily from solid-solution strengthening, not precipitation hardening.
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Size Range & Pressure Class
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Nominal Pipe Size (NPS):
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ASME B16.5: 1/2″ – 24″
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ASME B16.47: 26″ – 60″
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Pressure Class: 150 / 300 / 600 / 900 / 1500 / 2500
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Facing Types: RF / RTJ / FF
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We are the professional ASTM B564 UNS N06625 Inconel 625 Flange manufacturer,
ASTM B564 Inconel 625 UNS N06625 blind flanges provide exceptional corrosion resistance, high mechanical strength, and long-term reliability in the most demanding service environments. Fully compliant with ASTM B564 and ASME flange standards, Alloy 625 blind flanges are a trusted solution for offshore, chemical, and high-pressure piping systems.
How to order our Inconel 625 Flanges?
If you’re looking to purchase these ASTM B564 UNS N06625 Blind flanges, make sure to specify:
- The flange size (diameter, thickness, pressure rating)
- The required standard (ASTM B564)
- Material grade (UNS N06625, or Alloy 625 Inconel 625)
- Face type (RF, FF, RTJ, etc.)