Inconel 625 Flanges: High Temperature Resistance, Exceptional Corrosion Resistance, and Superior Mechanical Strength for Extreme Environments
Price:
Negotiable
MOQ:
Negotiable
Delivery Time:
(Sample order) 7 days
Brand:
DINGSCO
Product Description
Inconel 625 Flanges: High-Performance Solutions for Extreme Environments
Inconel 625 (UNS N06625) is a nickel-chromium-molybdenum alloy renowned for its extraordinary strength and superior resistance to corrosion. Inconel 625 flanges are engineered to withstand the most demanding industrial applications, from deep-sea oil extraction to aerospace exhaust systems.
Why Choose Inconel 625 Flanges?
Inconel 625 is a "workhorse" in the specialty metal industry. Unlike standard stainless steel, it maintains its integrity in environments where others fail.
- Exceptional Corrosion Resistance: Highly resistant to pitting, crevice corrosion, and intergranular attack. It is virtually immune to chloride-induced stress corrosion cracking.
- High Temperature Stability: Operates effectively from cryogenic temperatures up to 982°C (1800°F).
- Superior Mechanical Strength: The combination of nickel and chromium, fortified with molybdenum and niobium, provides high fatigue strength and toughness without the need for age-hardening heat treatments.
- Oxidation Resistance: Excellent resistance to oxidation and scaling at elevated temperatures.
Key Applications
Our Inconel 625 flanges are essential components in industries where safety and durability are non-negotiable:
- Marine & Offshore: Ideal for seawater piping, propeller blades, and submarine auxiliary motors due to its resistance to salt-water corrosion.
- Chemical Processing: Used in equipment handling highly acidic media, such as phosphoric acid or sulfuric acid environments.
- Oil & Gas: Crucial for sour gas (H2S) production and high-pressure wellhead components.
- Aerospace: High-temperature ducting systems and engine exhaust components.
- Nuclear Power: Core components and fuel element spacers.
Applicable Standards & Specifications
| Material Standard | ASTM B564 / ASME SB564 / UNS N06625 / DIN 2.4856 |
| Dimension Standards | ANSI B16.5, ANSI B16.47 Series A&B, MSS SP44, API-605, EN 1092-1, DIN, JIS, etc. |
| Pressure Ratings | 150#, 300#, 600#, 900#, 1500#, 2500# (ANSI); PN6-PN64 (DIN/EN) |
| Flange Types | Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint |
| Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Size Range | 1/2" to 36" (custom larger sizes available upon request) |
Chemical Composition
Inconel 625 is based on a nickel matrix, with precise proportions of various alloying elements to achieve superior comprehensive performance:
| Element | Content (%) | Function |
|---|---|---|
| Nickel (Ni) | ≥ 58.0 | Base element; provides austenitic stability and fundamental corrosion resistance |
| Chromium (Cr) | 20.0 ~ 23.0 | Forms a dense oxide layer; enhances oxidation and corrosion resistance |
| Molybdenum (Mo) | 8.0 ~ 10.0 | Improves resistance in reducing media; resists chloride-induced pitting |
| Niobium (Nb) | 3.15 ~ 4.15 | Key strengthening element; synergizes with molybdenum to provide high strength without heat treatment |
| Iron (Fe) | ≤5.0 | Controlled to ensure structural stability |
| Carbon (C) | ≤0.10 | Strictly controlled to prevent carbide precipitation affecting corrosion resistance |
| Cobalt (Co) | ≤1.0 | Controlled impurity element |
| Aluminum (Al) / Titanium (Ti) | ≤0.40 | Trace elements for microstructure stabilization |
Core Mechanism: The addition of niobium works synergistically with molybdenum to strengthen the alloy matrix through solid-solution strengthening, enabling Inconel 625 to achieve high strength without requiring precipitation hardening heat treatments.
Mechanical Properties
Inconel 625 forged flanges exhibit excellent strength-toughness balance in the solution annealed condition:
| Property | Room Temperature | At 650°C (1200°F) |
|---|---|---|
| Tensile Strength (Rm) | ≥827 MPa (120 ksi) | ≥760 MPa (110 ksi) |
| Yield Strength (Rp0.2) | ≥414 MPa (60 ksi) | ≥290 MPa (42 ksi) |
| Elongation (A) | ≥30% | ≥55% |
| Hardness | ≤220 HB | -- |
Temperature Adaptability: Maintains good tensile and fatigue properties from cryogenic -196°C (-320°F) up to 980°C (1800°F). Non-magnetic (permeability ≤1.0006).
Key Performance Advantages
Exceptional Corrosion Resistance
- Broad-spectrum Resistance: Excellent resistance to sulfuric, hydrochloric, nitric, and phosphoric acids, as well as mixed acid environments
- Localized Corrosion Resistance: Particularly resistant to chloride-induced pitting and crevice corrosion; suitable for seawater, brine, and high-chloride environments
- Stress Corrosion Cracking Resistance: Certified to NACE MR-01-75; resistant to sour gas environments containing hydrogen sulfide (H₂S)
- Oxidation Resistance: Maintains good oxidation resistance up to 982°C (1800°F)
Superior High-Temperature Strength
- Melting Range: 1290-1350°C (2350-2460°F); maintains structural integrity up to 1093°C (2000°F)
- Creep Resistance: Face-centered cubic crystal structure provides excellent creep and fatigue resistance at elevated temperatures
- Thermal Stability: Exhibits only minimal age hardening effects after prolonged service at 550-700°C (1020-1290°F)
Excellent Workability and Weldability
- Superior Weldability: ERNiCrMo-3 filler metal recommended; maintains stable performance without post-weld heat treatment
- Cold & Hot Workability: Moderate hardness after solution treatment (≤220 HB) facilitates machining; hot working recommended above 1200°C (2190°F)
- Formability: Elongation up to 50%, combining high strength with excellent plasticity
Heat Treatment
Inconel 625 flanges can be supplied in different heat treatment conditions based on service requirements:
| Treatment | Temperature Range | Cooling Method | Application |
|---|---|---|---|
| Solution Annealing | 1093-1204°C (2000-2200°F) | Water quench or air cool | Stress relief, enhanced corrosion resistance; standard delivery condition |
| Annealing | 927-1038°C (1700-1900°F) | Air cool or water quench | Improves ductility after cold working |
| Stress Relief | 900°C (1650°F) | Air cool | Relieves residual stresses from welding or cold forming |
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Company
Hunan Dinghan New Material Technology Co., LTD
Location
No. 2319, Building 2, Dongfang Furong Garden, No. 582 Yuanda 1st Road, Hehuayuan Street,Furong District, Changsha, Hunan Province, China.
Contact Person
Julia Wang