Inconel 718 Wafer Flange Compact Connections For Extreme Conditions
Inconel 718 Wafer Flanges are compact connections made of nickel-based superalloys that combine the extreme properties of Inconel 718 with the space advantages of a wafer struction:
1. Material essence: "Extreme adaptation" of nickel-based alloys
①Composition: Nickel matrix, containing chromium, niobium, molybdenum, titanium and aluminum.
| Element |
Content Range |
Core Function |
Advantages vs. 316 Stainless Steel |
| Ni |
50~55% |
Matrix for high-temperature stability |
Boosts high-temperature strength
(316 has ~12% Ni)
|
| Cr |
17~21% |
Resists oxidation, pitting/crevice corrosion |
Superior corrosion resistance
(316 has ~17% Cr but lacks Nb/Mo synergy)
|
| Nb |
5~6.5% |
Precipitation strengthening;
enhances fatigue resistance & weldability
|
Unique to Inconel 718 (316 contains no Nb) |
| Mo |
2.8~3.3% |
Improves corrosion resistance in Cl⁻/S-containing media |
Higher content than 316 (≈2% Mo) |
| Ti+Al |
Ti: 0.65~1.15%;
Al: 0.2~0.8%
|
Precipitation hardening for room-temperature strength |
316 has no precipitation-hardening design |
②Density: 8.19 g/cm³ (higher than ordinary stainless steel, ensuring structural stability).
2. Structural design: "Thin sheet logic" of compact connection
①Form: Thin disc-shaped, neckless (different from necked flange), through hole in the center matching pipe, symmetrically distributed bolt hole on the edge.
②Installation: Clamped between the clamp-on valve (such as check valve, butterfly valve) and the pipe, the bolt runs through the fastening, and the seal depends on the sealing surface of the valve body itself, saving 50% of the installation space.
③Details: The surface is machined/polished, roughness ≤ Ra1.6μm, and the edge is chamfered to avoid scratches on the mounting.
3. Performance breakthrough: The "all-rounder" of extreme working conditions
▶ Mechanical properties (core strengths)
①High temperature strength: The tensile strength still reaches 1350-1600 MPa at 650°C (far exceeding 500MPa of 316 stainless steel), and the creep resistance is excellent (creep deformation <0.2% at 1000 hours), which is suitable for high-temperature and high-pressure scenarios such as supercritical units (600°C+) and nuclear reactor circuits.
②Low temperature toughness: Impact power > 50J at -253°C, no risk of embrittlement.
▶ Corrosion resistance
①Corrosion resistance type: With high Cr and Mo content, it is resistant to pitting, crevice corrosion, and stress corrosion cracking (SCC), and performs well in chlorine-containing (e.g., seawater), sulfur-containing (e.g., petrochemical media), and strong oxidation (e.g., nitric acid) environments.
②Durability: Long-term exposure to high-temperature corrosive environments (such as 600°C steam) remains stable in strength and toughness, with a lifespan 3-5 times longer than 316 stainless steel flanges.
4. Application field: "Performance first" scenario
For extreme operating conditions:
| Industry Sectors |
Typical Working Conditions |
Why choose Inconel 718? |
| Nuclear Power |
Main loop valves (300℃+, high-pressure water) |
Resists high-temperature creep + corrosion;
service life ×3 longer than 316
|
| Aerospace |
Engine pipelines (600℃ hot gas, vibration) |
High specific strength (strength-to-weight ratio);
5% weight reduction
|
| Deep-Sea Engineering |
Subsea valves (seawater + high pressure) |
Outperforms duplex steel (e.g., 2205) in seawater corrosion |
| Chemical Cracking |
Cracking furnace valves
(400~600℃, Cl⁻/S-containing media)
|
Withstands media erosion + corrosion;
cuts maintenance frequency
|
5. Standards and specifications: Customized "strict system"
①Executive standards: ASTM B564, ASME SB564, covering wafer flanges and other types (such as weld necks, blind plates, etc.).
②Size range: 1/2"NB ~ 24" NB (mainly small diameter, large diameter needs to be customized and thickened).
③Pressure level: PN16 ~ PN400 (high-pressure scenarios need to match the valve body design), flange face types include RF (protruding surface), RTJ (ring connection), FF (flat surface).
Inconel 718 wafer flange is an "exclusive solution for extreme working conditions", which plays an irreplaceable value in nuclear power, aerospace and other fields with reliable connections under high temperature, high pressure and strong corrosion.
DINGSCO
Hunan Dinghan New Material Technology Co., Ltd. (DINGSCO) specialized in Nickel Based Corrosion Resistant and High Temperature alloys products which used in the world’s most technically demanding industries and applications.We are dedicated to providing our customers with best quality products, fastest possible deliveries, most competitive prices of Nickel Based Corrosion Resistant and High Temperature alloys in bars, rods, forged flanges, valve parts (Ball, Stem, Seat Ring, etc), forged shapes (shafts, discs, blocks, hubs, rings, cylinders and other custom shapes) according to ASTM, ASME, API, AMS, NACE and other industry standards.
PROFESSIONAL NICKEL ALLOY MANUFACTURER
- Monel, Incoloy, Inconel, Hastelloy
- VIM, ESR, Forging, Heat treatment, Machining
- Round Bar, Ball, Stem, Ring, Flange, etc
- ISO9001, API-6A, API-20B, PED, NORSOK
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