DN100 Slip On Carbon Steel Flange

The DN100 (4-inch) carbon steel slip-on flange is a high-quality, high-strength forged flange specifically designed for DN100 pipe connections. Pipelines can be directly inserted into the flange's inner bore and connected via double-sided fillet welds on both the inner and outer sides.

As a professional flange manufacturer with many years of experience in foreign trade exports, we strictly adhere to mainstream international standards in producing DN100 slip-on flanges. Our products are widely used in global oil and gas, chemical, power, water treatment, HVAC, and industrial fluid transport systems, fully meeting the stringent requirements of various large-scale projects for pressure resistance, mechanical properties, and corrosion resistance.

Efficient installation, reduced labor time: Pipes are directly inserted into the flange inner hole for welding, eliminating the need for complex pipe beveling preparation, significantly reducing on-site construction difficulty and shortening the construction period.

Double-sided welding, robust structure: Utilizing an inner and outer double-sided fillet weld structure, it effectively improves the tensile and shear strength of the connection, making it particularly suitable for industrial pipeline networks operating for extended periods and subject to pipe vibration.

Precision machining, zero leakage risk: The sealing surface is precision-machined using a high-precision CNC machine tool, with strict control over dimensional tolerances and surface roughness to ensure a perfect fit with the gasket, providing durable and reliable sealing performance.

Global standard compatibility: Fully supports customization according to international standards such as ASME, EN, DIN, and JIS, seamlessly aligning with the procurement specifications and design requirements of engineering projects in various countries.

We possess a stable raw material supply chain and efficient production lines, enabling us to offer highly competitive business terms to global wholesalers and distributors.

Minimum Order Quantity (MOQ): 50-100 pieces (depending on specific pressure rating and material; trial orders/sample orders are supported).

Lead Time: 15-25 days after receiving deposit (based on standard 20ft container orders).

Monthly Production Capacity: 800 tons/month.

Main Shipping Ports: Qingdao Port / Shanghai Port / Tianjin Port (China).

OEM/ODM Customization Services: Supports processing of non-standard size drawings, customization of special materials, laser marking (Logo & furnace number), and custom branded packaging.

Raw Material Spectroscopic Testing: We rigorously select high-quality carbon steel round bars conforming to ASTM/EN standards. Before entering the factory, they must undergo material analysis and mechanical property re-inspection using a PMI spectrometer.

Die Forging/Free Forging: Utilizing advanced forging processes, we completely eliminate internal material defects, optimize metal flow lines, and significantly improve the flange's compressive mechanical properties.

CNC Precision Machining: Water lines, bolt holes, and inner bores are all machined using CNC intelligent machining, ensuring extremely high consistency in dimensional tolerances during large-volume procurement.

Deep Anti-corrosion Treatment: For long-distance sea transport, we provide high-quality rust-preventive oils, rust-preventive paints, or hot-dip galvanizing treatments with thicknesses meeting standards.

To prevent flanges from becoming damp, rusty, or damaged by impact during the dozens of days of ocean freight, we use the highest international export packaging standards:

All flange sealing surfaces are equipped with plastic protective caps/bubble wrap for isolation.

The entire product is packed into fumigation-free plywood cases or reinforced wooden pallets conforming to ISPM 15 standards.

The case is lined with a thick, waterproof plastic inner liner to ensure the product remains dry in the humid sea freight environment.

International System Certifications: The factory has passed ISO 9001:2015 quality management system certification, EU CE certification, and PED 2014/68/EU (Pressure Equipment Directive) certification, qualifying it to directly supply high-end projects in Europe and America.

Comprehensive Material Traceability: Each batch of goods comes with a material certificate (MTC) conforming to EN 10204 3.1, covering authentic chemical composition, tensile test, and impact test data.

Support for Third-Party Testing: We have long-term cooperation with internationally authoritative testing organizations such as SGS, BV, TUV, and Intertek, supporting third-party sampling inspections before shipment according to customer requirements (PMI, ultrasonic testing (UT), dimensional measurement, etc.).