In the most demanding environments such as offshore engineering, deep-sea oil and gas exploration, and chemical processing, standard stainless steel often falls short. Jiangyin Zhonghai Precision Machinery Co., Ltd. produces F55 (S32760) and F60 (S32205) stainless steel flanges that represent the pinnacle of duplex steel forging technology.

F60 (Duplex) combines the best properties of austenite and ferrite, while F55 (Super Duplex) provides exceptionally high pitting resistance (PREN ≥ 40) through the addition of tungsten and copper. By integrating advanced in-house forging with meticulous heat treatment control, we ensure every flange maintains high strength and superior resistance to stress corrosion cracking (SCC), providing long-term safety for your critical piping systems.

Core Advantages
·Expertise in Duplex Metallurgy: F55/F60 materials are highly sensitive to heat treatment temperatures. With in-house heat treatment and physical/chemical testing, we precisely control phase balance to guarantee mechanical compliance.
·Full-Scale Customization: We offer a full size range from 1/2" to 60". Whether following ASME/DIN standards or manufacturing custom components up to 4 meters in diameter, we provide rapid evaluation and high-precision delivery.
·Global Quality Certifications: ISO 9001 certified with PED, TUV, and TS qualifications, meeting the rigorous entry standards of the global oil, gas, and chemical industries.
 Manufacturing Flexibility: We support everything from small-batch prototyping to large-scale mass production, with single-piece weight capacities up to 10 tons to match your project timelines and budgets.

Key Features
·Exceptional Corrosion Resistance: Specifically engineered for acidic environments with high chloride content, offering extreme resistance to pitting, crevice corrosion, and SCC.
·High-Strength Design: Yield strength is approximately double that of conventional austenitic stainless steels, allowing for reduced wall thickness and lower overall system weight.
·Optimized Forged Grain Flow: Our internal forging process ensures continuous metal fiber flow, significantly enhancing fatigue life under fluctuating pressure conditions.
·Zero-Defect Delivery: An independent QA department oversees Ultrasonic Testing (UT), Magnetic Particle Testing (MT), and rigorous chemical analysis to ensure compliance with ASTM/ASME, API, and EN standards.

Applications
·Offshore Oil & Gas: Deep-sea drilling platforms, subsea pipelines, and umbilical system flanges.
·Chemical Processing: Pressure vessel and reactor interfaces for chlorides, organic acids, and strong oxidants.
·Desalination: High-pressure seawater transport pumps and heat exchanger connections.
·Pulp & Paper: Corrosion-resistant piping for bleaching processes and water recycling systems.