ASTM A105 is the industry standard for carbon steel forgings in ambient and high-temperature pressure systems. At Jiangyin Zhonghai Precision Machinery Co., Ltd., our A105 carbon steel flanges are manufactured to strictly adhere to international technical standards including ASME, ASTM, EN, and DIN. Through our integrated forging and heat treatment processes, we guarantee exceptional mechanical properties and structural integrity.

Our portfolio spans from standard 1/2" to 60" flanges to massive, high-precision custom components. With the capability to produce flanges up to 4 meters in diameter and 10 tons in unit weight, Zhonghai provides a one-stop solution—from technical evaluation and mold development to precision machining—tailored to your specific project requirements.

Core Advantages
·Fully Integrated Production: We operate a complete internal production line for forging, heat treatment, CNC machining, and physical/chemical testing, ensuring total quality control.
· Certified Reliability: ISO 9001 certified with PED, TUV, and TS credentials, meeting global standards for pressure equipment and industrial safety.
· Heavy-Duty & Large-Scale Capacity: One of the few manufacturers capable of producing 4-meter diameter flanges and 10-ton single components for heavy infrastructure.
·Rapid Customization Service: Provide us with your drawings or key parameters (OD, ID, Thickness, PCD, etc.), and our team will provide a rapid assessment and optimized manufacturing plan.
· Stringent Quality Assurance: Our independent QA department conducts rigorous testing (including UT and MT) to ensure compliance with API, ASTM, and specific client requirements.

Key Features
·Superior Mechanical Strength: Our forging process eliminates internal porosities and segregation, resulting in higher tensile strength and impact toughness compared to cast alternatives.
·Precision CNC Machining: Utilizing advanced CNC turning and drilling to ensure exact sealing surface flatness and bolt hole tolerances for a perfect fit during installation.
·Customized Heat & Surface Treatments: We offer normalizing and tempering per A105 standards, along with anti-rust oil, black/yellow paint, or hot-dip galvanizing for corrosion resistance.
·Broad Pressure Range: Available from Class 150 to Class 2500, covering applications from commercial piping to extreme high-pressure industrial environments.

Application Scenarios
 ·Oil & Gas: High-pressure connections in onshore and offshore pipeline systems.
 ·Pressure Vessels: Interfaces for boilers, heat exchangers, and storage tanks.
 ·Power Generation: Auxiliary piping and cooling water systems for thermal and nuclear plants.
 · Heavy Machinery: Structural supports and hydraulic system connections for large-scale equipment.
 ·Petrochemical Refining: High-temperature media transport and refining equipment.