API 6A RTJ WN Flange Monel K500 Ni-Cu Alloy For High-Pressure And Corrosive

API 6A RTJ WN Flange Monel K500 Ni-Cu Alloy For High-Pressure And Corrosive

ⅠMaterial base: Monel K500 alloy characteristics
Monel K500 (UNS N05500) is a nickel-copper-based precipitation-hardening alloy with core components (ASTM B564 standard):
▶ Nickel (Ni) ≈ 63-67%, copper (Cu) ≈ 27-33%, aluminum (Al: 2.3-3.1%), titanium (Ti: 0.35-0.85%) to enhance aging.
▶ After aging treatment, Ni₃(Al,Ti) reinforced phase is precipitated internally, which makes the strength soar: the tensile strength is > 1000MPa (about 2 times that of Monel 400), and the yield strength is 3 times that of ordinary carbon steel.

ⅡFlange structure: design logic of butt welding + RTJ
1. Weld Neck Flange structure
▶ Neck extension: The flange has a cylindrical neck, which distributes stress on the neck when welding with the pipeline to avoid cracking of the flange and pipeline connection area under high pressure.
▶ Size range: diameter (DN) 10~5000mm, pressure class 150~2500 (corresponding to 6.3~42MPa), covering from conventional to ultra-high pressure working conditions.
2. RTJ sealing surface design
▶ Ring groove features: Concentric circular grooves are machined in the center of the flange seal face (most of the cross-sections are trapezoidal/rectangular, in accordance with ASME B16.5 standards) for embedding metal ring gaskets.
▶ Sealing principle: Under high pressure, the metal ring gasket is deformed to fill the annular groove to achieve a "metal-to-metal" seal, and the leakage resistance is much stronger than that of rubber/asbestos gasket.

ⅢCore performance: Why choose it?
1. Corrosion resistance "hard power"
▶ Extreme media resistance: 3 times higher resistance to sulfide stress corrosion (SSCC) than Monel 400 in oil-gas mixtures containing H₂S, CO₂; It is also resistant to seawater, salt solution, and high-temperature steam corrosion.
▶ Data support: After 6 years of actual service, the corrosion amount < 0.02mm (far lower than the standard requirements), which is due to the stability of the passivation film of high Ni-Cu alloy and the uniform microstructure after aging treatment.
2. Mechanical properties and reliability
▶ High strength + high toughness: The hardness after aging ≥ 270HB, while maintaining good toughness (elongation ≥20%), and can withstand 500 pressure cycles (0-28MPa) without leakage or deformation.
▶ Machining and connection advantages: Aluminum and titanium elements improve weldability, and when hydraulic preload bolts, the flange neck is rigid, and the preload deviation can be controlled within ±3% to ensure long-term sealing.

ⅣApplication scenarios: "exclusive players" in high-pressure and corrosive environments
1. Energy field: Oil production trees of offshore drilling platforms, oil and gas transmission pipelines (high-pressure sulfur-containing medium).
2. Nuclear power industry: Nuclear island cooling system, high-pressure steam pipeline connection.
3. Marine engineering: Seawater desalination equipment, ship propulsion system (seawater corrosion resistance + high pressure).

ⅤCompare with similar products (to better understand its value)

To put it simply, Monel K500 butt weld flange + RTJ sealing surface is a "customized solution" for high-pressure and highly corrosive environments - the reinforced characteristics of the material + the structural strength of butt weld + the sealing reliability of RTJ jointly support its long-term stable operation in extreme scenarios such as oil production trees and nuclear power. If your project involves similar working conditions, you can choose it!

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

CORE VALUE

• QUALITY ASSURANCE
• SCIENCE AND TECHNOLOGY INNOVATION STRATEGY
• COOPERATION

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