4301 (AISI 304) and 1.4404 (AISI 316L) are the most trusted austenitic stainless steel grades in modern engineering. Jiangyin Zhonghai Precision Machinery Co., Ltd. specializes in manufacturing high-performance flanges in these grades, strictly adhering to EN, DIN, ASME, and other international standards.

Our capability extends from standard 1/2" to 60" ranges to specialized large-scale components up to 4 meters in diameter, supporting pressure ratings up to 2500 lbs. Through our integrated production line, we ensure that every flange maintains superior sealing and structural integrity under severe acidic, alkaline, or high-pressure cyclic loading.

Core Advantages
·Dual EU Certifications: ISO 9001 certified with PED (2014/68/EU), TUV, and TS qualifications, ensuring full compliance with European pressure equipment safety regulations.
·Integrated Forging Prowess: Comprehensive in-house capabilities for forging, heat treatment, and CNC machining, with a single-piece weight capacity of up to 10 tons.
·Material Integrity: Guaranteed chemical composition through spectral analysis—1.4301 for versatile processability and 1.4404 for ultra-low carbon content and superior pitting resistance.
·Customization Experts: Whether it is a standard component or a complex non-standard part based on your drawings, we provide a seamless service from rapid evaluation to final delivery.

Key Features
·Intergranular Corrosion Resistance: Especially for 1.4404, our precise carbon control and heat treatment processes ensure excellent corrosion resistance even after welding.
·High-Precision Machining: Utilizing advanced CNC turning and drilling centers, we control sealing face roughness and geometric tolerances to the most exacting standards.
·Superior Mechanical Properties: Our forging process refines the grain structure and ensures continuous metal flow lines, significantly increasing pressure resistance compared to plate-cut alternatives.
·Rigorous Inspection: Comprehensive NDT reports (UT, PT) are available upon request to guarantee zero internal defects.

Applications
·Petrochemical Industry: Ideal for highly corrosive fluid transport systems and pressure vessel interfaces.
·Food & Pharmaceutical: The purity of 1.4404 meets the hygiene requirements of sanitary equipment and cleanroom production lines.
·Marine & Offshore: Engineered to withstand high-salinity environments for offshore platforms and vessel piping.
·Energy & Nuclear Power: Reliable high-pressure connections for critical systems where long-term safety is paramount.