The Stainless Steel 304 series is the most versatile and widely used choice for industrial piping systems globally. Jiangyin Zhonghai Precision Machinery Co., Ltd. combines advanced in-house forging technology with precision CNC machining to offer a comprehensive range of F304, F304L, and F304H flanges.

Our products are engineered for demanding environments. By strictly controlling chemical composition and heat treatment protocols, we ensure our flanges maintain superior structural stability and sealing reliability across temperatures ranging from cryogenic to elevated heat. Whether you require standard ASME/DIN/JIS components or massive 10-ton, 4-meter custom-engineered parts, we provide a one-stop solution from evaluation to delivery.

Core Advantages
·Integrated Production Chain: From raw material cutting and induction heating to open-die/die forging, heat treatment, and precision machining—we ensure 100% quality traceability.
·Global Certifications: We are an ISO 9001 certified manufacturer holding PED (Pressure Equipment Directive) and TS (Special Equipment Licensing) credentials, meeting the compliance needs of international markets.
·Unrivaled Customization: Equipped with 4-meter machining centers and 10-ton forging capacity, we specialize in rapid evaluation and high-precision delivery of non-standard structures and oversized flanges.
·Precise Metallurgy: We offer dedicated laboratory testing to ensure carbon content—whether low-carbon "L" or high-strength "H"—strictly adheres to ASTM/ASME A182 standards.

Key Features
·Structural Integrity: Forged from premium stainless steel round bars to eliminate casting defects, significantly enhancing tensile strength and impact toughness.
·Precision Sealing Surfaces: CNC-machined to ensure that RF, FF, and RTJ faces meet exact flatness and roughness specifications for zero-leakage performance.
·Condition-Specific Grades:  F304/304L: Excellent general corrosion resistance; 304L prevents intergranular corrosion after welding.
·F304H: Specifically designed for high-temperature service with higher creep strength.
·Surface Finishes: Options for pickling, passivation, sandblasting, or precision polishing to enhance oxidation resistance and aesthetics.

Applications
·Petrochemical & Refining: Corrosive media transport, storage tank connections, and pressure vessels.
·Food & Pharmaceutical: Meeting stringent hygiene requirements for material purity and smooth surface finishes.
·Power & Energy: Auxiliary system connections for conventional and renewable energy plants.
·Municipal Engineering: Desalination plants and high-standard water treatment systems for long-term service.