JIS B2220 20K Steel Flanges are high-pressure rating components designed according to Japanese Industrial Standards, widely used in piping systems that demand exceptional sealing integrity and structural strength.

At Jiangyin Zhonghai Precision Machinery Co., Ltd., we combine integrated in-house forging capabilities with high-precision CNC machining to offer a comprehensive range of 20K flanges, including Slip-On (SOP/SOH), Welding Neck (WN), and Blind (BL) types. Supported by our ISO 9001, PED, and TS certified quality systems, our 20K flanges ensure reliable performance under dynamic pressure cycles and complex industrial environments.

Core Advantages
 ·Expertise in JIS Standards: Strict adherence to JIS B2220 protocols, ensuring that chemical compositions and geometric tolerances perfectly align with the rigorous requirements of Japanese engineering projects.
 ·Vertical Production Integration: Our full production line—from raw material cutting and forging to heat treatment and CNC finishing—optimizes the internal grain structure, providing pressure resistance far superior to standard plate-cut flanges.
 ·Heavy-Scale & Custom Capabilities: With a capacity for single components up to 10 tons and diameters up to 4 meters, we excel in both standard supply and bespoke non-standard 20K forged parts based on client blueprints.
 ·Rigorous Quality Assurance: An independent QA department oversees all workflows, ensuring every product complies with international technical standards (JIS/ASME/EN) and specific customer requirements.

Key Features
·Superior Pressure Resilience: Optimized heat treatment processes ensure our flanges possess high yield strength and impact toughness under 20K pressure ratings.
·High-Precision Sealing Faces: Utilizing precision turning for JIS-specific sealing requirements (such as RF and GF) to ensure a perfect fit with gaskets for leak-free operations.
·Material Integrity: We select premium steel grades including SF440A, SS400, SUS304, and SUS316, all provided with complete Material Test Certificates (MTC).
·Flexible Manufacturing: We support everything from small-batch prototypes to mass production, providing rapid evaluation and delivery for both standard and modified structures.

Applications
Zhonghai 20K Steel Flanges are engineered for high-reliability environments:
·Petrochemicals: Refineries, chemical transport lines, and high-pressure reactor interfaces.
·Power & Energy: Industrial boiler networks, thermal cycle systems, and pump station connections.
·Marine Engineering: Ballast systems and engine room piping compliant with Japanese maritime standards.
·Heavy Equipment: Core connection components for pressure vessels, heavy machinery, and hydraulic systems.