Inconel 625 Flanges

Inconel 625 Flanges Supplier in Mumbai, India - ASTM B564 UNS N06625

Nicorex Alloys is an ISO 9001 / ISO 14001 certified supplier of Inconel 625 flanges in Mumbai, India. UNS N06625 (Werkstoff 2.4856) flanges are forged to ASTM B564 / ASME SB564.

Inconel 625 flanges are very strong and highly corrosion‑resistant. Its chemical composition contains at least 58% nickel, 20-23% chromium, 8-10% molybdenum, and 3.15-4.15% niobium plus tantalum. They can handle both oxidising and reducing chemicals and still provide a minimum tensile strength of 827 MPa (120 ksi) from cryogenic temperatures up to 982°C (1800°F). With a PREN of about 51, they are almost completely resistant to pitting caused by chlorides, especially in the gasket‑to‑flange crevice area where corrosion usually starts. Because they combine strong resistance to different acids, high strength, and excellent pitting resistance, Nickel Alloy 625 is one of the most versatile flange materials for offshore, chemical, and marine piping systems.

The molybdenum and niobium strengthen the alloy without age hardening, so the flanges maintain full corrosion resistance even after forging. They are available in WNRF, SORF, BLRF, SWRF, threaded, lap joint, long weld neck (LWN), ring type joint (RTJ), spectacle blind, and reducing types. Standard sizes cover NPS 1/2″ to 24″ as per ASME B16.5 and NPS 26″ to 60″ as per ASME B16.47, in pressure classes from 150 to 2500. These flanges comply with NACE MR0175 / ISO 15156 for sour service and are supplied with EN 10204 3.1B material test certificates (MTC) and positive material identification (PMI).

Inconel 625 Flanges Specifications

Technical specifications describing manufacture, size range, pressure ratings, flange types, and dimensional requirements for Inconel 625 forged flanges in piping systems:

Standard	ASTM B564 / ASME SB564
Dimensional	ASME B16.5, B16.47, B16.36, B16.48, MSS SP-44, EN 1092-1, JIS B2220
Size (ASME B16.5)	NPS 1/2” to NPS 24”
Size (ASME B16.47)	NPS 26” to NPS 60”
Pressure Classes	150, 300, 400, 600, 900, 1500, 2500
Face Types	RF, FF, RTJ, Tongue & Groove, Male & Female
Flange Types	WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, LWNRF, RTJ, Spectacle Blind, Reducing

Chemical Composition of Inconel 625 Flanges

Chemical composition of ASTM B564 UNS N06625 Inconel 625 flanges, with an analysis of alloying elements and their respective percentages:

Element	Ni	Cr	Mo	Nb+Ta	Fe	C	Mn	Si	P	S	Al	Ti	Co
Alloy 625	58.0 min	20.0–23.0	8.0–10.0	3.15–4.15	5.0 max	0.10 max	0.50 max	0.50 max	0.015 max	0.015 max	0.40 max	0.40 max	1.0 max

Mo at 8-10% combined with Nb at 3.15-4.15% provides both corrosion resistance and solid-solution strengthening without precipitation hardening. Cr at 20-23% handles oxidising media. The Nb addition also stabilises the alloy against intergranular corrosion in the as-welded condition, eliminating the need for PWHT on flange-to-pipe joints.

Mechanical Properties of ASTM B564 Inconel 625 Flanges

Mechanical property summary of ASTM B564 Inconel 625 flanges, showing solution‑annealed forged strength, ductility, and compliance values:

Tensile Strength (min)	Yield 0.2% Offset (min)	Elongation in 4D (min)
827 MPa (120 ksi)	414 MPa (60 ksi)	30%

Solution treatment at 1093-1204°C (2000-2200°F) followed by air cool or faster sets these properties. The alloy derives strength from Mo and Nb in solid solution. For Grade 2 forgings used above 593°C, different property requirements may apply per ASTM B564 supplementary requirements.

625 Inconel Flanges Equivalent Grades

Equivalent grade chart for Inconel 625 flanges, listing cross‑reference standards, specifications, trade names, and industry designations for this alloy:

UNS	Werkstoff	EN	JIS	GOST	AFNOR
N06625	2.4856	NiCr22Mo9Nb	NCF 625	ХН75МБТЮ	NC22DNB4M

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Types of Inconel 625 Flanges Available

Alloy 625 flanges are forged to ASTM B564. Solid-solution strengthening means all types retain full corrosion resistance after forging and machining:

Inconel 625 Weld Neck Flange (WNRF)

Inconel 625 Slip-On Flange (SORF)

Inconel 625 Blind Flange (BLRF)

Inconel 625 Socket Weld Flange (SWRF)

Inconel 625 Threaded Flange

Inconel 625 Lap Joint Flange (LJRF)

Inconel 625 Ring Type Joint Flange (RTJ)

Alloy 625 Long Weld Neck Flange (LWNRF)

Inconel 625 Spectacle Blind Flange

Inconel 625 Reducing Flange

Industrial Applications of Inconel 625 Flanges

Oil, gas, power, and chemical plants use special equipment to work safely and reliably in high-pressure, high-temperature, corrosive conditions.

Oil & Gas Offshore Platforms: Massive offshore structures used to drill, extract, and partially treat oil and gas found beneath the seabed.
Subsea Pipeline Systems: Underwater pipeline networks that move oil, gas, and associated fluids from offshore production sites to onshore processing plants.
Chemical Processing Equipment: Large-scale industrial reactors, tanks, and piping systems used to perform and control chemical reactions in manufacturing processes.
Acid Handling Plants: Facilities specifically designed to safely produce, store, and transfer highly corrosive acids.
Power Generation Plants: Facilities that convert fuel or renewable energy sources into electrical power for residential, commercial, and industrial use.
Gas Turbine Components: Key parts, such as blades and vanes, that can withstand very high heat and heavy stress inside gas turbine engines.

How to Order Inconel 625 Flanges from Nicorex Alloys

To order Inconel 625 Flanges, provide these 11 important details:

Flange Type (WNRF, SORF, BLRF, SWRF, Threaded, Lap Joint, LWNRF, RTJ, Spectacle Blind, Reducing)
Size (NPS)
Pressure Class (150, 300, 600, 900, 1500, 2500)
Face Type (RF, FF, RTJ, T&G)
Material Grade (Inconel 625 / UNS N06625 / ASTM B564)
Schedule (for WNRF/SWRF — bore must match pipe schedule)
Quantity (pieces or kg)
Documentation Requirements (MTC 3.1, PMI, TPI by specific agency)
Surface Finish Requirements (standard 125–250 μin or special)
Packaging (standard or sea-worthy export packing)
Delivery Destination (domestic India or international export)

Custom sizes and non-standard classes available. Quotation within 24 hours.

Frequently Asked Questions

What is the price of Inconel 625 Flanges per kg in India?

In India, Inconel 625 flanges usually cost ₹2,800 to ₹4,500 per kg. The price changes with the flange type, size, and current nickel and chromium prices.

What welding consumable is recommended for Inconel 625 WNRF flanges?

ERNiCrMo-3 (AWS A5.14) for GTAW; ENiCrMo-3 (AWS A5.11) for SMAW. No PWHT required.

What ASTM Specification Covers Inconel 625 Forged Flanges?

ASTM B564 / ASME SB564 covers forged flanges, fittings, and valves in UNS N06625.

Can Alloy 625 Flanges be Used in Sour Gas (H₂S) Service?

Yes. Solution-annealed Inconel 625 meets NACE MR0175 / ISO 15156 for sour service. The alloy resists sulphide stress cracking and hydrogen embrittlement in H₂S-bearing environments.

What is the Maximum Service Temperature for 625 Flanges?

Useful strength to 982°C (1800°F). Prolonged exposure between 650-850°C may cause delta-phase precipitation that reduces ductility. Verify with ASME B16.5 pressure-temperature ratings for sustained high-temperature service.

How does Inconel 625 compare to Hastelloy C276 for Flanges?

Both alloys perform reliably in mixed-acid environments. Inconel 625 offers higher strength (120 vs 100 ksi tensile) and holds up better at elevated temperatures, while Hastelloy C276 is usually the better choice when the main concern is reducing acids, especially hydrochloric acid (HCl). Select based on the dominant corrosion mechanism.

What is the PREN value of Inconel 625, and why does it matter for flanges?

PREN ≈ 51 (This exceptionally high value means Alloy 625 flanges are virtually resistant to pitting in chloride environments: critical at gasket-to-flange crevice zones where pitting typically initiates.